XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

WORCESTER GREENSTAR STYLE

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

WORCESTER GREENSTAR STYLE

Next: &6, !f2

TYPE OF DIAGNOSTIC PROCEDURE


Next: &801, !f4

OBSERVATION DISPLAY OPERATES

Next: &1530, ?200, ?202

FAULT 224, 2963, 2964, 2965, 2966, 2967 - OVERHEAT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f745

FAULT 228 - FALSE FLAME

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f781

FAULT 1065 - PRESSURE SENSOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f166

FAULT 1037 AND 1068 - OUTDOOR SENSOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f1306

FAULT 1021 - DHW SENSOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f158

FAULT 815 - LLH SENSOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f1148

FAULT 306 - FLAME AFTER DEMAND

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f724

FAULT 1075 AND 1076 - HEATING BLOCK THERMISTOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f181

FAULT 1073 AND 1074 - FLOW THERMISTOR FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f175

FAULT 207, 1017, 2971 - SYSTEM PRESSURE TOO LOW

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f186

FAULT 2970 - PRESSURE DROP IN SYSTEM TOO RAPID

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f938

OBSERVATION BOILER SELF CHECK

ENSURE CENTRAL HEATING TURNED OFF

Next: &247, ?52, ?54, ?56, ?272

FURTHER INVESTIGATION MAINS FUSE DUMMY

HEADER FOR MAINS FUSE INVESTIGATION - OUTSIDE MODEL

Next: &nff, f137

OBSERVATION FAN RUNS DHW DEMAND

SET FLOW RATE TO APPROXIMATELY 3 LITRES A MINUTE

Next: &315, ?237, ?239

OBSERVATION DHW FLOW RATE

Next: &236, f248

OBSERVATION BURNER IGNITION

Next: &513, ?329, ?355, ?430

FAULT 214, 2961, 2962 - FAN FAULT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f734

OBSERVATION BOILER RESPONDS TO CH DEMAND

Next: &526, f1334

OPERATION DHW

Next: &589, ?527, ?535, ?539, ?551

OPERATION CH

Next: &641, ?592, ?594, ?596

OPERATION PREHEAT

EXTERNAL CONTROLS (I

Next: &654, f1116

OBSERVATION PUMP OVERRUN

ENSURE BOILER IS SET TO ECO MODE
ENSURE NO DEMAND

Next: &663, ?1738, ?1740

COMBUSTION TEST MAX AND MINIMUM

Next: &nff, ?664, ?666, ?1973

FAULT 234, 238, 2923, 2924, 2925, 2926, 2927, GAS VALVE ELECTRICAL FAULTS

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f918

FAULT CODES

Next: &51, !f802

VOLTAGE DIVERTER VALVE AT PCB (ALTERNATIVE) HEADER

HEADER FOR ALTERNATIVE TEST - OUTSIDE MODEL

Next: &nff, f991

FAULT 232, 233, 235, 242, 244, 245, 249, 250, 251, 252, 253, 254, 257, 258, 259, 262, 263, 360, 362, 1025, 2908, 2914, 2915, 2916, 2931, 2940, 2946, 2957 CODE PLUG AND PCB FAULT CODES

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f978

FAULT 1019 & 281 - PUMP PWM / HALL ISSUE

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f1587

INFORMATION INTELLIGENT FILLING LOOP

THIS APPLIANCE CAN B

Next: &nff, !f989

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f1004

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1003

HEADER FOR FILLING LOOP FAULT FINDING

HEADER FOR FILLING LOOP FAULT FINDING - OUTSIDE MODEL

Next: &nff, f1008

OBSERVATION DIVERTER MOTOR MOVEMENT (ALTERNATIVE - CH) HEADER

HEADER OUTSIDE MODEL

Next: &nff, f1145

INFORMATION DISPLAY OPERATION AND FAULT CODES


THE USER INTERFA

Next: &3, !f1531

INFORMATION FAULT CODES (DETAILED)

THE APPLIANCE HAS 5

Next: &nff, !f1636

INFORMATION USER INTERFACE (DETAILED)

THE DISPLAY WILL SLE

Next: &nff, !f1635

HEADER FOR QUICK ACCESS DATA FLOW THERMISTOR

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1812

HEADER FOR QUICK ACCESS DATA HEAT BLOCK THERMISTOR

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1821

HEADER FOR QUICK ACCESS DATA HOT WATER THERMISTOR

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1818

HEADER FOR QUICK ACCESS DATA GAS VALVE RESISTANCE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1824

HEADER FOR QUICK ACCESS DATA PUMP AC RESISTANCE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1831

HEADER FOR QUICK ACCESS DATA PUMP AC VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1835

HEADER FOR QUICK ACCESS DATA PUMP DC VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1838

HEADER FOR QUICK ACCESS DATA FAN RESISTANCES

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1841

HEADER FOR QUICK ACCESS DATA FAN VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1844

HEADER FOR QUICK ACCESS DATA DIVERTER VALVE RESISTANCE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1849

HEADER FOR QUICK ACCESS DATA DIVERTER VALVE VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1852

HEADER FOR QUICK ACCESS DATA DHW FLOW TURBINE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1861

HEADER FOR QUICK ACCESS DATA GAS VALVE VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1828

VOLTAGE DIVERTER VALVE AT PCB (ALTERNATIVE) HEADER QADAI

HEADER FOR ALTERNATIVE TEST - OUTSIDE MODEL

Next: &nff, f1857

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR VOLTAGE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1865

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR RESISTANCE

HEADER FOR QUICK ACCESS DATA

Next: &nff, f1869

FAULT 229, 2948, 2949, 2950, 2951 - FLAME LOSS AFTER IGNITION

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f1918

INFORMATION MAINTENANCE SETTINGS

THIS APPLIANCE HAS A

Next: &nff, !f2013

INFORMATION WIRELESS CONTROL ERRORS

THESE ERROR CODES RE

Next: &nff, !f2015

FAULT 2085, 2972 LOW MAINS VOLTAGE

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f2017

FAULT 2955, 2956 HYDRAULIC PARAMETERS

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f2023

FAULT 269, 363, 2920, 2952 FLAME MONITORING

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f2057

FAULT 2910 FLUE SYSTEM

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f2081

FAULT 1010, A91 EMS OR BUS

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f2092

OBSERVATION DIVERTER MOTOR MOVEMENT (ALTERNATIVE - DHW) HEADER

HEADER OUTSIDE MODEL

Next: &nff, f2192

INFORMATION CONNECTOR NAMES

WORCESTER BOSCH HAS

Next: &nff, !f2463

INFORMATION EMS BUS / WIRELESS CONTROLS DISCONNECTION FOR POOR CH OPERATION

THE WIRELESS AND EMS

Next: &nff, !f2635

INFORMATION INSTALLER MODE AND MENUS

TO ENTER THE INSTALL

Next: &nff, !f2847

DIVERTER VOLTAGE FAULT DHW

CONTROL BOX - ACU

Next: End

BLANK FOR LITE DIAGNOSTIC

Z REDIRECT

Next: End

BLANK FOR QADAI

Z REDIRECT

Next: End

FAILED ELECTRICALLY

SOLENOID FILLING LOOP (INTELLIGENT FILLING LOOP)

Next: End

NOT POWERING FILLING SOLENOID

CONTROL BOX - ACU

Next: End

SHORTED TO EARTH CAUSING FALSE FLAME

ELECTRODE - C/W SPRING

Next: End

RESTRICTED OR BLOCKED CAUSING FALSE FLAME

SIPHON - ASSEMBLY

Next: End

FAULTY CAUSING FALSE FLAME

ELECTRODE - C/W SPRING

Next: End

PASSING FALSE FLAME

GAS - VALVE

Next: End

ACTIVATED CORRECTLY

APPLIANCE FROST PROTECTION (FIRING)

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION (FIRING)

SENSOR 18MM (FLOW)

Next: End

LOST SO DEFAULT ON

WIRELESS SIGNAL

Next: End

NO VOLTAGE CONTROLS FAULTY SENDING DEMAND

Next: End

240V CONTROLS FAULTY SENDING DEMAND

Next: End

CH DEMAND WHEN SHOULD NOT BE

EMS BUS CONTROLS

Next: End

SENDING DEMAND INCORRECTLY

WIRELESS CONTROLS

Next: End

240V PREHEAT CONTROLS NOT SENDING DEMAND

Next: End

NO PREHEAT WIRELESS CONTROLS

CONTROL BOX - ACU

Next: End

MISSING WIRELESS CONTROLS

PREHEAT LINK

Next: End

MISSING EBUS CONTROLS

PREHEAT LINK

Next: End

NO PREHEAT EBUS CONTROLS

CONTROL BOX - ACU

Next: End

BLANK FOR DIVERTER MOVEMENT 2

Z REDIRECT

Next: End

ERROR CODE

LOW LOSS HEADER SENSOR

Next: End

LOW LOSS HEADER SETTINGS

CONTROL BOX SETTINGS

Next: End

OPEN CIRCUIT STOPPING SPARK

HARNESS IGNITION CABLE

Next: End

NO POWER TO SPARK GEN

CONTROL BOX - ACU

Next: End

SPARK GENERATOR SECTION

HARNESS - 240V - COMBI/SYSTEM

Next: End

RESTRICTED OR BLOCKED PREVENTING IGNITION

SIPHON - ASSEMBLY

Next: End

RESTRICTED OR BLOCKED PREVENTING IGNTION

FLUE

Next: End

STUCK PREVENTING IGNITION

NON - RETURN - VALVE - C5 (BEARING PLATE)

Next: End

DAMAGED PREVENTING IGNITION

BURNER

Next: End

GAS VALVE DAMAGED PCB

CONTROL BOX - ACU AND GAS VALVE

Next: End

RESTRICTED PREVENTING IGNITION

VENTURI

Next: End

SPARK ELECTRODES FAULTY

ELECTRODE - C/W SPRING

Next: End

DAMAGED OR RESTRICTED PREVENTING IGNITION

BURNER

Next: End

OPEN CIRCUIT

HARNESS GND CABLE

Next: End

NOT PROVIDING CH DEMAND

EMS BUS CONTROLS

Next: End

MISSING EBUS CONTROLS

HEATING LINKS

Next: End

SHORTED

PUMP - UPM3

Next: End

NO VOLTAGE CONTROLS FAULTY

Next: End

NO CH RESPONSE - NO VOLTAGE TO CONTROLS

CONTROL BOX - ACU

Next: End

MISSING WIRELESS CONTROLS

HEATING LINKS

Next: End

PREVENING CH - HEATING KEY

OUTDOOR SENSOR

Next: End

NO CH RESPONSE

CONTROL BOX - ACU

Next: End

PREVENTING CH - HEATING KEY 240V

OUTDOOR SENSOR

Next: End

NO CH RESPONSE 240V

CONTROL BOX - ACU

Next: End

PREVENTING CH - HEATING KEY NO VOLTAGE CONTROLS

OUTDOOR SENSOR

Next: End

NO CH RESPONSE NO VOLTAGE CONTROLS

CONTROL BOX - ACU

Next: End

PREVENTIG CH- HEATING KEY EBUS

OUTDOOR SENSOR

Next: End

NO CH RESPONSE EBUS

CONTROL BOX - ACU

Next: End

NOT PROVIDING CH DEMAND NO OUTDOOR SENSOR

EMS BUS CONTROLS

Next: End

MISSING EBUS CONTROLS NO OUTDOOR SENSOR

HEATING LINKS

Next: End

NO CH RESPONSE - NO VOLTAGE TO CONTROLS NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

MISSING WIRELESS CONTROLS NO OUTDOOR SENSOR

HEATING LINKS

Next: End

MISSING PREVENTING CH OUTDOOR SENSOR FITTED

NO VOLTAGE CONTROLS LINK

Next: End

NO VOLTAGE CONTROLS FAULTY NO OUTDOOR SENSOR

Next: End

MISSING / INCOMPLETE 2

240V CONTROLS LINK

Next: End

MISSING PREVENING CH

NO VOLTAGE CONTROLS LINK

Next: End

MISSING / INCOMPLETE

240V CONTROLS LINK

Next: End

HEATING OUTPUT SETTINGS

CONTROL BOX SETTINGS

Next: End

BLANK FOR INFORMATION ON DISPLAY AND FAULT CODES

Z REDIRECT

Next: End

OUT OF CALIBRATION CASING HOT/COLD DHW

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

NO VOLTAGE TO PUMP

CONTROL BOX - ACU

Next: End

PUMP SECTION SELF CHECK

HARNESS - 240V - COMBI/SYSTEM

Next: End

PUMP DC SECTION FAULTY STOPPING PUMP AT SELF CHECK

HARNESS - 24V - CHG

Next: End

PUMP DC HALL/PWN SECTION FAULTY STOPPING PUMP AT SELF CHECK

CONTROL BOX - ACU

Next: End

PUMP DC SECTION FAULTY

HARNESS - 24V - CHG

Next: End

PUMP DC HALL/PWN SECTION FAULTY

CONTROL BOX - ACU

Next: End

NO AC VOLTAGE TO PUMP PUMP/PWM FAULT CODE

CONTROL BOX - ACU

Next: End

PUMP SECTION ERROR CODE

HARNESS - 240V - COMBI/SYSTEM

Next: End

PUMP DC SECTION FAULTY STOPPING PUMP AT SELF CHECK PUMP/PWM FAULT CODE

HARNESS - 24V - CHG

Next: End

PUMP DC HALL/PWN SECTION FAULTY STOPPING PUMP FAULT CODE

CONTROL BOX - ACU

Next: End

NO AC VOLTAGE TO PUMP PUMP/PWM FAULT CODE OVERHEAT

CONTROL BOX - ACU

Next: End

FAULTY CAUSING ERROR CODE

SENSOR - TEMPERATURE - DHW

Next: End

PUMP SECTION OVERHEAT

HARNESS - 240V - COMBI/SYSTEM

Next: End

PUMP DC SECTION FAULTY STOPPING PUMP AT SELF CHECK PUMP/PWM FAULT CODE OVERHEAT

HARNESS - 24V - CHG

Next: End

PUMP DC HALL/PWN SECTION FAULTY STOPPING PUMP FAULT CODE OVERHEAT

CONTROL BOX - ACU

Next: End

MAX CH FLOW TEMPERATURE SETTING

CONTROL BOX SETTINGS

Next: End

BLANK FOR DETAILED DISPLAY INFORMATION

Z REDIRECT

Next: End

BLANK FOR DETAILED FAULT CODES INFORMATION

Z REDIRECT

Next: End

OUT OF CALIBRATION AFFECTING CH OPERATION

LOW LOSS HEADER SENSOR

Next: End

FROST PROTECTION OPERATING INCORRECTLY (PUMP) NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION NO OUTDOOR SENSOR

LOW LOSS HEADER SENSOR

Next: End

OUT OF CALIBRATION FROST PROTECTION

OUTDOOR SENSOR

Next: End

NO VOLTAGE TO PRESSURE SENSOR

CONTROL BOX - ACU

Next: End

FROST PROTECTION OPERATING INCORRECTLY (PUMP)

CONTROL BOX - ACU

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION

LOW LOSS HEADER SENSOR

Next: End

OUT OF RANGE ERROR CODE

OUTDOOR SENSOR

Next: End

OUTDOOR SENSOR SETTINGS

CONTROL BOX SETTINGS

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEM LLH

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGS LLH

CONTROL BOX SETTINGS

Next: End

PRESSURE SENSOR SECTION

HARNESS - 24V - CHG

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEM

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGS

CONTROL BOX SETTINGS

Next: End

DHW SET TOO LOW HOT AND COLD

CONTROL BOX SETTINGS

Next: End

DHW SET TOO LOW POOR DHW

CONTROL BOX SETTINGS

Next: End

ACTIVATED CORRECTLY 2

APPLIANCE FROST PROTECTION (FIRING)

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION (FIRING) - NO FROST STAT

SENSOR 18MM (FLOW)

Next: End

CH DEMAND WHEN SHOULD NOT BE NO EXTERNAL FROST STAT

EMS BUS CONTROLS

Next: End

NO VOLTAGE CONTROLS FAULTY SENDING DEMAND NO EXTERNAL FROST STAT

Next: End

240V CONTROLS FAULTY SENDING DEMAND NO EXTERNAL FROST STAT

Next: End

LOST SO DEFAULT ON NO EXTERNAL FROST STAT

WIRELESS SIGNAL

Next: End

SENDING DEMAND INCORRECTLY NO EXTERNAL FROST STAT

WIRELESS CONTROLS

Next: End

FAULTY QADAI

SENSOR 18MM (FLOW)

Next: End

FAULTY QADAI

SENSOR - TEMPERATURE - DHW

Next: End

FAULTY QADAI

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

SOLENOID FAILED QADAI

GAS - VALVE

Next: End

NO VOLTAGE TO GAS VALVE QADAI

CONTROL BOX - ACU

Next: End

FAULTY QADAI

PUMP - UPM3

Next: End

NO POWER TO PUMP QADAI

CONTROL BOX - ACU

Next: End

DC PUMP VOLTAGE

CONTROL BOX - ACU

Next: End

RESISTANCE WRONG QADAI

FAN

Next: End

FAN VOLTAGES WRONG QADAI

CONTROL BOX - ACU

Next: End

FAULTY QADAI

MOTOR - DIVERTER VALVE

Next: End

NO VOLTAGE TO DIVERTER QADAI

CONTROL BOX - ACU

Next: End

DIVERTER VOLTAGE FAULT 3

CONTROL BOX - ACU

Next: End

FAULTY QADAI

TURBINE

Next: End

NO POWER TO SPARK GENERATOR QADAI

CONTROL BOX - ACU

Next: End

FAULTY QADAI

IGNITION - TRANSFORMER

Next: End

INTERNAL FAULT

CONTROL BOX - ACU

Next: End

MISALIGNED OR WATER INGRESS

PCB OR APPLIANCE CONNECTIONS

Next: End

WRONG CODE PLUG TYPE

CODE PLUG

Next: End

POOR FITMENT CAUSING ERROR CODES

THERMISTOR FITMENT

Next: End

OUT OF CALIBRATION CAUSING OVERHEAT

SENSOR 18MM (FLOW)

Next: End

FAULTY CAUSING OVERHEAT

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

BLANK FOR INFORMATION ON FLAME LOSS

Z REDIRECT

Next: End

LOW CAUSING BAFFLING

GAS INLET PRESSURE

Next: End

RESTRICETD OR BREACHED RECTIFICATION ISSUE

FLUE

Next: End

PARTIALLY STUCK CAUSING NO RECTIFICATION

NON - RETURN - VALVE - C5 (BEARING PLATE)

Next: End

DAMAGED PREVENTING RECTIFICATION

BURNER

Next: End

RESTRICTED PREVENTING RECTIFICATION

VENTURI

Next: End

RECTIFICATION SECTION OPEN CIRCUIT

HARNESS - 24V - CHG

Next: End

LOW CAUSING RECTIFICATION ISSUES

GAS INLET PRESSURE

Next: End

RESTRICTED CAUSING FLAME LOSS

SIPHON - ASSEMBLY

Next: End

LOW WHEN RUNNING ON MAX RATE

GAS INLET PRESSURE

Next: End

LOW CAUSING FLAME LOSS

GAS INLET PRESSURE

Next: End

RECTIFICATION ELECTRODE CAUSING FLAME LOSS AT MINIMUM

ELECTRODE - C/W SPRING

Next: End

BLANK FOR FLAME LOSS FURTHER INVESTIGATION

Z REDIRECT

Next: End

RECTIFICATION ELECTRODE CAUSING FLAME LOSS

ELECTRODE - C/W SPRING

Next: End

CAUSING FLAME LOSS

BURNER

Next: End

RESTRICTED CAUSING FLAME LOSS

FLUEWAYS

Next: End

BLANK FOR INFORMATION CASE REMOVAL

Z REDIRECT

Next: End

LOW CAUSING FLAME LOSS AT MAXIMUM

GAS INLET PRESSURE

Next: End

CAUSING FLAME LOSS AT MINIMUM

BURNER

Next: End

RESTRICTED CAUSING FLAME LOSS

FLUE

Next: End

CAUSING FLAME LOSS AT MAXIMUM

BURNER

Next: End

RESTRICTED CAUSING FLAME LOSS AT MAXIMUM

FLUEWAYS

Next: End

RESTRICTED CAUSING FLAME LOSS AT MINIMUM

FLUEWAYS

Next: End

BLANK FOR INFORMATION MAINTENANCE SETTINGS

Z REDIRECT

Next: End

BLANK FOR INFORMATION WIRELESS CONTROL ERRORS

Z REDIRECT

Next: End

LOW CAUSING ERROR CODE

Next: End

DISPLAYING LOW MAINS VOLTAGE FAULT

CONTROL BOX - ACU

Next: End

HYDRAULIC SETTINGS

CONTROL BOX SETTINGS

Next: End

DISPLAYING HYDRAULIC PARAMETERS FAULT

CONTROL BOX - ACU

Next: End

SHORTED TO EARTH CAUSING FLAME MONITORING FAULT

ELECTRODE - C/W SPRING

Next: End

FAULTY CAUSING FLAME MONITORING FAULT

ELECTRODE - C/W SPRING

Next: End

RECTIFICATION SECTION SHORTED

HARNESS - 24V - CHG

Next: End

RESTRICTED OR BLOCKED CAUSING FLUE FAULT ERROR

SIPHON - ASSEMBLY

Next: End

RESTRICTED OR BLOCKED FLUE FAULT

FLUE

Next: End

FLUE FAULT WONT RESET

CONTROL BOX - ACU

Next: End

INNER SEALS BREACHED FLUE ERROR

FLUE

Next: End

EMS OR BUS FAULT

CONTROL BOX - ACU

Next: End

MISSING EMS ERROR

HEATING LINKS

Next: End

MISSING EBUS ERROR

HEATING LINKS

Next: End

BUS FAULT

CONTROL BOX - ACU

Next: End

WIRING TOO CLOSE PARALLEL

EMS BUS AND MAINS WIRING INSTALLATION

Next: End

POOR FITMENT

COVER INSTALLER ACCESS (KEY WIRING CONNECTOR)

Next: End

ACTIVATED CORRECTLY

EXTERNAL FROST PROTECTION (FROST AND OR PIPE STAT)

Next: End

CORRECTLY ACTIVATED

EXTERNAL FROST PROTECTION (LOW LOSS HEADER)

Next: End

CORRECTLY ACTIVATED NO OUTDOOR SENSOR

EXTERNAL FROST PROTECTION (LOW LOSS HEADER)

Next: End

GAS VALVE SECTION FAULTY

HARNESS - 24V - CHG

Next: End

BLOWING FUSE

FAN

Next: End

SHORTED

IGNITION - TRANSFORMER

Next: End

MISSING NO PREHEAT CONTROLS

PREHEAT LINK

Next: End

PARTIALLY RESTRICTED AFFECTING OUTPUT

NON - RETURN - VALVE - C5 (BEARING PLATE)

Next: End

RESTRICTED PREVENTING RECTIFICATION

SIPHON - ASSEMBLY

Next: End

RESTRICTED CAUSING FLAME LOSS

VENTURI

Next: End

BREACHED CAUSING FAILED FGA FLAME LOSS

FLUE / BURNER SEALS

Next: End

BREACHED CAUSING FLAME LOSS

FLUE / BURNER SEALS

Next: End

BREACHED CAUSING FLUE FAULT

FLUE / BURNER SEALS

Next: End

BLANK FOR DIVERTER MOVEMENT 2 DHW

Z REDIRECT

Next: End

RESTRICTED CAUSING FGA FAIL

FLUEWAYS

Next: End

SHORTED CAUSING FLASHING DISPLAY (NO WIRELESS CONTROLS KEY)

TURBINE

Next: End

RUNNING CAUSING DEMAND

OPEN TAP OR LEAK

Next: End

CAUSING DHW HOT AND COLD

AIR IN BOILER OR SYSTEM

Next: End

CAUSING POOR DHW

AIR IN BOILER OR SYSTEM

Next: End

FAULTY CAUSINF ERROR CODE

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

OUT OF CALIBRATION ACTIVATING FROST (PUMP)

SENSOR 18MM (FLOW)

Next: End

CAUSING POOR CH

AIR IN BOILER OR SYSTEM

Next: End

FULLY CLOSED CAUSING POOR CH

VALVE - CH

Next: End

CAUSING NO CH

AIR IN BOILER OR SYSTEM

Next: End

FAN VOLTAGES INCORRECT 2

CONTROL BOX - ACU

Next: End

CAUSING OVERHEAT

AIR IN BOILER OR SYSTEM

Next: End

BLANK FOR INFORMATION CONNECTOR NAMES

Z REDIRECT

Next: End

CLOSED TOO MUCH

Next: End

RESTRICTED WATERWAYS OVERHEAT

HEAT EXCHANGER - WB5

Next: End

POOR

WATER SUPPLY

Next: End

LOW CAUSING COMBUSTION ISSUES

GAS INLET PRESSURE

Next: End

PARTIALLY OR FULLY CLOSED

VALVE - DHW IN

Next: End

POOR FITMENT CAUSING POOR DHW

THERMISTOR FITMENT

Next: End

POOR FITMENT CAUSING DHW HOT AND COLD

THERMISTOR FITMENT

Next: End

POOR FITMENT CAUSING POOR CH

THERMISTOR FITMENT

Next: End

CLOSED CAUSING OVERHEAT

VALVE - CH

Next: End

EXTERNAL MIXING

PLUMBING ISSUE

Next: End

BLANK FOR INFORMATION PAGE ON EMS / WIRELESS CONTROLS DISCONNECTION

Z REDIRECT

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEM EMS BUS - CH COOL

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGS EMS BUS - CH COOL

CONTROL BOX SETTINGS

Next: End

OUT OF CALIBRATION AFFECTING CH OPERATION EMS BUS - CH COOL

LOW LOSS HEADER SENSOR

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEM LLH EMS BUS - CH COOL

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGS LLH EMS BUS - CH COOL

CONTROL BOX SETTINGS

Next: End

DHW FLOW TURBINE SECTION SHORTED (NO WIRELESS CONTROLS KEY)

HARNESS - 24V - CHG

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEMWIRELESS - CH COOL

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGSWIRELESS - CH COOL

CONTROL BOX SETTINGS

Next: End

OUT OF CALIBRATION AFFECTING CH OPERATIONWIRELESS - CH COOL

LOW LOSS HEADER SENSOR

Next: End

OUT OF CALIBRATION CAUSING COOL SYSTEM LLHWIRELESS - CH COOL

OUTDOOR SENSOR

Next: End

HEATING CURVE SETTINGS LLHWIRELESS - CH COOL

CONTROL BOX SETTINGS

Next: End

LOAD COMPENSATION FAULTY

WIRELESS CONTROLS

Next: End

LOAD COMPENSATION FAULTY

EMS BUS CONTROLS

Next: End

WEAK OR SLOW POOR CH RADS NO OR POOR HEAT

PUMP - UPM3

Next: End

DIVERTER MOTOR SECTION DHW

HARNESS - 24V - CHG

Next: End

DIVERTER VOLTAGE FAULT NO CH

CONTROL BOX - ACU

Next: End

BODY SEIZED

DIVERTER VALVE ASSEMBLY

Next: End

OPEN TOO MUCH

Next: End

PUMP OUTPUT SETTINGS

CONTROL BOX SETTINGS

Next: End

RECTIFICATION SECTION OPEN CIRCUIT DROPPING OUT AT MINIMUM

HARNESS - 24V - CHG

Next: End

OUT OF CALIBRATION PREVENTING DEMAND

SENSOR 18MM (FLOW)

Next: End

SYSTEM CIRCULATION ISSUE CAUSING OVERHEAT

Next: End

FAN SECTION

HARNESS - 240V - COMBI/SYSTEM

Next: End

OUT OF CALIBRATION PREVENTING DEMAND

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION (FIRING)

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

OUT OF CALIBRATION ACTIVATING FROST PROTECTION (FIRING) - NO FROST STAT

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

OUT OF CALIBRATION ACTIVATING FROST (PUMP)

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

OUT OF CALIBRATION CAUSING POOR CH

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

FAULTY CAUSING ERROR CODE

SENSOR 18MM (FLOW)

Next: End

BLANK FOR INSTALLER MODE AND MENUS INFORMATON

Z REDIRECT

Next: End

BLOWN

FUSE (FUSED SPUR)

Next: End

BLOWN

FUSE INTERNAL 5A

Next: End

SHORTED CAUSING BLANK DISPLAY (WIRELESS CONTROLS KEY FITTED)

TURBINE

Next: End

DHW FLOW TURBINE SECTION SHORTED (WIRELESS CONTROLS KEY FITTED)

HARNESS - 24V - CHG

Next: End

RESTRICTED OR BLOCKED CAUSING BAFFLING

SIPHON - ASSEMBLY

Next: End

RESTRICTED OR BREACHED CAUSING BAFFLING 2

FLUE

Next: End

PARTIALLY STUCK CAUSING BAFFLING

NON - RETURN - VALVE - C5 (BEARING PLATE)

Next: End

CAUSING POOR COMBUSTION BAFFLING

BURNER

Next: End

BLANK FOR TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

RESTRICTED CAUSING BAFFLING

VENTURI

Next: End

RESTRICTED OR BREACHED CAUSING BAFFLING

FLUE

Next: End

OUT OF CALIBRATION MAKING WATER TOO HOT

SENSOR - TEMPERATURE - DHW

Next: End

WEAK OR SLOW CAUSING HOT AND COLD DHW

PUMP - UPM3

Next: End

OUT OF CALIBRATION CAUSING WATER TO RUN HOT AND COLD

SENSOR - TEMPERATURE - DHW

Next: End

OUT OF CALIBRATION CAUSING HOT AND COLD DHW

SENSOR 18MM (FLOW)

Next: End

LOW LIMITING OUTPUT

GAS INLET PRESSURE

Next: End

WEAK OR CLOW POOR DHW

PUMP - UPM3

Next: End

RESTRICTED

FLUE

Next: End

RESTRICTED LIMITING OUTPUT

BURNER

Next: End

OUT OF CALIBRATION KEEPING WATER TOO COOL

SENSOR - TEMPERATURE - DHW

Next: End

OUT OF CALIBRATION CAUSING POOR DHW

SENSOR - TEMPERATURE (HEATING BLOCK)

Next: End

RESTRICTED WATERWAYS DHW HOT AND COLD

HEAT EXCHANGER - WB5

Next: End

ACTIVATED CORRECTLY

APPLIANCE FROST PROTECTION (PUMP)

Next: End

NO OR LOW CHARGE

EXPANSION - VESSEL - 10L

Next: End

PATIALLY OR FULLY CLOSED CAUSING POOR CH

VALVE - CH

Next: End

WEAK OR SLOW POOR CH BOILER RUNNING AT LOW ONLY

PUMP - UPM3

Next: End

OUT OF CALIBRATION CAUSING POOR CH

SENSOR 18MM (FLOW)

Next: End

RESTRICTED AFFECTING FGA

SIPHON - ASSEMBLY

Next: End

RESTRICTED AFFECTING FGA

VENTURI

Next: End

CAUSING POOR COMBUSTION FGA

BURNER

Next: End

RESTRICTED WATERWAYS DHW TOO COOL

HEAT EXCHANGER - WB5

Next: End

OUT OF CALIBRATION CAUSING POOR DHW

SENSOR 18MM (FLOW)

Next: End

RESTRICTED OR BLOCKED FLAME AFTER DEMAND ERROR

FLUE

Next: End

RESTRICTED OR BLOCKED CAUSING FLAME AFTER DEMAND ERROR

SIPHON - ASSEMBLY

Next: End

PASSING

GAS - VALVE

Next: End

FAN VOLTAGES INCORRECT

CONTROL BOX - ACU

Next: End

OPEN CIRCUIT WHEN COOL

TEMPERATURE LIMITER

Next: End

WEAK OR SLOW CAUSING OVERHEAT

PUMP - UPM3

Next: End

BLANK FOR FAULT CODES

Z REDIRECT

Next: End

OUT OF CALIBRATION PREVENING DEMAND

SENSOR - TEMPERATURE - DHW

Next: End

LOW PREVENTING FAN RUNNING

Next: End

BLOCKED ERROR CODE

PRESSURE - SENSOR (BLOCKAGE)

Next: End

BLOCKED LOW PRESSURE WARNING

PRESSURE - SENSOR (BLOCKAGE)

Next: End

FAN SECTION DEMAND

HARNESS - 240V - COMBI/SYSTEM

Next: End

NO SUPPLY VOLTAGE TO DHW TURBINE

CONTROL BOX - ACU

Next: End

DHW FLOW TURBINE SECTION

HARNESS - 24V - CHG

Next: End

SOLENOID FAILED

GAS - VALVE

Next: End

DISPLAYING GAS VALVE ELECTRICAL FAULT

CONTROL BOX - ACU

Next: End

DISPLAYING PRESSURE DROP FAULT

CONTROL BOX - ACU

Next: End

CAUSING POOR COMBUSTION BAFFLING 2

BURNER

Next: End

BREACHED CAUSING FAILED FGA 2

FLUE / BURNER SEALS

Next: End

BREACHED CAUSING FAILED FGA

FLUE / BURNER SEALS

Next: End

FAULTY CAUSING ERROR CODE

CODE PLUG

Next: End

SHORTED

PRESSURE - SENSOR

Next: End

BLANK INFORMATION INTELLIGENT FILLING LOOP

Z REDIRECT

Next: End

DIVERTER VOLTAGE FAULT 2

CONTROL BOX - ACU

Next: End

DIVERTER MOTOR SECTION CH

HARNESS - 24V - CHG

Next: End

OPEN CIRCUIT

INTELLIGENT FILLING LOOP (HARNESS)

Next: End

NOT OPENING

SOLENOID FILLING LOOP (INTELLIGENT FILLING LOOP)

Next: End

SHORTED TO EARTH CAUSING FALSE FLAME

HARNESS - 24V - CHG

Next: End

DISPLAYING FALSE FLAME FAULT

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT NO VOLTAGE CONTROLS

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT 240V CONTROLS

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT BE EBUS CONTROLS

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT WIRELESS CONTROLS

CONTROL BOX - ACU

Next: End

LOW CAUSING ERROR CODE

SYSTEM PRESSURE

Next: End

NO PREHEAT 240V PREHEAT CONTROLS

CONTROL BOX - ACU

Next: End

NO PREHEAT DEMAND

EMS BUS CONTROLS

Next: End

BLANK FOR DIVERTER MOVEMENT

Z REDIRECT

Next: End

DISPLAYING LLH FAULT

CONTROL BOX - ACU

Next: End

DISPLAYING LLH FAULT WITH LLH

CONTROL BOX - ACU

Next: End

NOT GENERATING SPARK

IGNITION - TRANSFORMER

Next: End

RESTRICTED PREVENTING IGNITON

FLUEWAYS

Next: End

LOW PREVENTING IGNITION

GAS INLET PRESSURE

Next: End

NO POWER TO GAS VALVE

CONTROL BOX - ACU

Next: End

GAS VALVE HARNESS DAMAGED PCB

CONTROL BOX - ACU - 8700 AND HARNESS ASSEMBLY HV AND IGNITION

Next: End

NOT OPENING

GAS - VALVE

Next: End

OPENING BUT WRONG MIX FOR IGNITION

GAS - VALVE

Next: End

ELECTRODE GND SECTION OPEN CIRCUIT

HARNESS - 24V - CHG

Next: End

PUMP SECTION SHORTED

HARNESS - 240V - COMBI/SYSTEM

Next: End

NO CH RESPONSE EBUS CONTROLS

CONTROL BOX - ACU

Next: End

240V CONTROLS SENDING NO DEMAND

Next: End

NO CH DEMAND

WIRELESS CONTROLS

Next: End

NO CH RESPONSE - HEATING KEY

CONTROL BOX - ACU

Next: End

PUMP WONT RUN (CORRECT OPERATION) ADVISE ACCORDINGLY

PUMP SET UP ENERGY SAVING

Next: End

PUMP WONT RUN (CORRECT OPERATION) ADVISE ACCORDINGLY 240V

PUMP SET UP ENERGY SAVING

Next: End

PUMP WONT RUN (CORRECT OPERATION) ADVISE ACCORDINGLY NO VOLTAGE CONTROLS

PUMP SET UP ENERGY SAVING

Next: End

PUMP WONT RUN (CORRECT OPERATION) ADVISE ACCORDINGLY EBUS

PUMP SET UP ENERGY SAVING

Next: End

240V CONTROLS SENDING NO DEMAND NO OUTDOOR SENSOR

Next: End

NO CH DEMAND NO OUTDOOR SENSOR

WIRELESS CONTROLS

Next: End

NO CH RESPONSE - HEATING KEY NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

NO CH RESPONSE EBUS CONTROLS NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

NO CH RESPONSE - WIRED CONTROLS NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

NO CH RESPONSE NO VOLTAGE CONTROLS NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

NO CH RESPONSE - WIRED CONTROLS

CONTROL BOX - ACU

Next: End

NO CH RESPONSE NO VOLTAGE CONTROLS OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

NOT RUNNING AT STARTUP

PUMP - UPM3

Next: End

DC HALL/PWM SIDE FAULTY STOPPING PUMP AT SELF CHECK

PUMP - UPM3

Next: End

DC HALL/PWM SIDE FAULTY

PUMP - UPM3

Next: End

NOT RUNNING CAUSING ERROR CODE

PUMP - UPM3

Next: End

DHW SENSOR SECTION

HARNESS - 24V - CHG

Next: End

DC HALL/PWM SIDE FAULTY STOPPING PUMP AT SELF CHECK PUMP/PWM FAULT CODE

PUMP - UPM3

Next: End

NOT RUNNING CAUSING OVERHEAT

PUMP - UPM3

Next: End

DC HALL/PWM SIDE FAULTY STOPPING PUMP AT SELF CHECK PUMP/PWM OVERHEAT

PUMP - UPM3

Next: End

DISPLAYING DHW SENSOR FAULT

CONTROL BOX - ACU

Next: End

FROST PROTECTION (PUMP) ACTIVATING INCORRECTLY NO OUTDOOR SENSOR

CONTROL BOX - ACU

Next: End

ACTIVATED VIA OUTDOOR SENSOR

EXTERNAL FROST PROTECTION (OUTDOOR SENSOR)

Next: End

FROST PROTECTION RUNNING PUMP INCORRECTLY

CONTROL BOX - ACU

Next: End

FROST PROTECTION (PUMP) ACTIVATING INCORRECTLY

CONTROL BOX - ACU

Next: End

DISPLAYING OUTDOOR SENSOR FAULT

CONTROL BOX - ACU

Next: End

OUTDOOR SENSOR ERROR

CONTROL BOX - ACU

Next: End

LOW CH OUTPUT WITH LLH

CONTROL BOX - ACU

Next: End

POOR CH OUTPUT LLH

CONTROL BOX - ACU

Next: End

LOW CH OUTPUT

CONTROL BOX - ACU

Next: End

POOR CH OUTPUT

CONTROL BOX - ACU

Next: End

PUMP OVERRUN SET INCORRECTLY

CONTROL BOX SETTINGS

Next: End

ELECTRICALLY FAILED

PRESSURE - SENSOR

Next: End

PUMP OVERRUN OPERATION INCORRECT

CONTROL BOX - ACU

Next: End

POOR DHW OUTPUT

CONTROL BOX - ACU

Next: End

DHW TEMPERATURE CONTROL HOT AND COLD

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT BE EBUS CONTROLS NO EXTERNAL FROST STAT

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT NO VOLTAGE CONTROLS NO EXTERNAL FROST STAT

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT 240V CONTROLS NO EXTERNAL FROST STAT

CONTROL BOX - ACU

Next: End

CH DEMAND WHEN SHOULD NOT WIRELESS CONTROLS NO EXTERNAL FROST STAT

CONTROL BOX - ACU

Next: End

DISPLAYING PRESSURE SENSOR FAULT

CONTROL BOX - ACU

Next: End

FLOW THERMISTOR

RESULT AS EXPECTED

Next: End

DHW THERMISTOR

RESULT AS EXPECTED

Next: End

HEATING BLOCK THERMISTOR

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

VOLTAGE TO GAS VALVE

RESULT AS EXPECTED

Next: End

HEATING BLOCK THERMISTOR SECTION

HARNESS - 24V - CHG

Next: End

PUMP AC

RESULT AS EXPECTED

Next: End

PCB PUMP VOLTAGE AC

RESULT AS EXPECTED

Next: End

PCB PUMP VOLTAGE DC

RESULT AS EXPECTED

Next: End

FAN

RESULT AS EXPECTED

Next: End

PCB VOLTAGE TO FAN

RESULT AS EXPECTED

Next: End

DISPLAYING HEATING BLOCK THERMISOT FAULT

CONTROL BOX - ACU

Next: End

DIVERTER VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

PCB VOLTAGE TO DIVERTER

RESULT AS EXPECTED

Next: End

PCB VOLTAGE TO DIVERTER QADAI

RESULT AS EXPECTED

Next: End

DHW FLOW TURBINE

RESULT AS EXPECTED

Next: End

PCB VOLTAGE TO SPARK GENERATOR

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

BLANK FOR CODE PLUG/PCB RELATED FAULTS

Z REDIRECT

Next: End

RESTRICTED OR BLOCKED OVERHEAT

HEAT EXCHANGER - PLATE

Next: End

NO REASON FOUND FOR OVERHEAT

NO FAULT FOUND - OVERHEAT INVESTIGATION

Next: End

TRIPPING EARLY

TEMPERATURE LIMITER

Next: End

TEMPERATURE CONTROL FAULTY RUNNING TOO HOT

CONTROL BOX - ACU

Next: End

BLOCKED OVERHEAT

GAUGE - PRESSURE

Next: End

LOW CAUSING OVERHEAT

SYSTEM PRESSURE

Next: End

BLOCKED DHW HOT AND COLD

GAUGE - PRESSURE

Next: End

LOW CAUSING DHW HOT AND COLD

SYSTEM PRESSURE

Next: End

RESTRICTED AFFECTING RECTIFICATION

FLUEWAYS

Next: End

NOT RECTIFYING

CONTROL BOX - ACU

Next: End

RECTIFICATION ELECTRODE NOT ESTABLISHING

ELECTRODE - C/W SPRING

Next: End

WRONG MIX ON MAXIMUM

GAS - VALVE

Next: End

MIX WRONG CAUSING FLAME LOSS AT MAXIMUM

GAS - VALVE

Next: End

FLAME LOSS ERRORS

CONTROL BOX - ACU

Next: End

MIX WRONG CAUSING FLAME LOSS AT MINIMUM

GAS - VALVE

Next: End

WRONG MIX CAUSING FLAME LOSS AT MAXIMUM 2

GAS - VALVE

Next: End

WRONG MIX CAUSING FLAME LOSS AT MINIMUM 2

GAS - VALVE

Next: End

BLANK FOR LOW VOLTAGE RESET

Z REDIRECT

Next: End

BLANK FOR FAULT HYDRAULIC PARAMETERS

Z REDIRECT

Next: End

FLAME MONITORING FAULTS

NO FAULT - RESET AFTER LOCKOUT

Next: End

SHORTED TO EARTH CAUSING FLAME MONITORING FAULT

HARNESS - 24V - CHG

Next: End

FLAME MONITORING FAULT

CONTROL BOX - ACU

Next: End

FLUE FAULT

NO FAULT - RESET AFTER LOCKOUT

Next: End

BLANK FOR RESET EMS OR BUS

Z REDIRECT

Next: End

ERROR CODE

EMS BUS CONTROLS

Next: End

POOR CONNECTION/FAULTY

CONNECTION BETWEEN WIRELESS KEY AND INSTALLER ACCESS COVER

Next: End

PREVENTING PREHEAT OPERATION

WIRELESS CONTROLS

Next: End

FAN SECTION SHORTED

HARNESS - 240V - COMBI/SYSTEM

Next: End

NO FAULT FOUND FOR FUSE FAILURE

NO FAULT FOUND FUSE INVESTIGATION

Next: End

SPARK GENERATOR SECTION SHORTED

HARNESS - 240V - COMBI/SYSTEM

Next: End

NO PREHEAT NO PREHEAT CONTROLS

CONTROL BOX - ACU

Next: End

INNER BREACHED CAUSING FLAME LOSS

FLUE

Next: End

BLANK FOR DIVERTER MOVEMENT DHW

Z REDIRECT

Next: End

BLOCKED POOR DHW

GAUGE - PRESSURE

Next: End

LOW CAUSING POOR DHW

SYSTEM PRESSURE

Next: End

DISPLAY FLASHES

CONTROL BOX - ACU

Next: End

BLOCKED POOR CH

GAUGE - PRESSURE

Next: End

LOW CAUSING POOR CH

SYSTEM PRESSURE

Next: End

BLOCKED NO CH

GAUGE - PRESSURE

Next: End

LOW CAUSING NO CH

SYSTEM PRESSURE

Next: End

DISPLAYING FALSE FLAME

CONTROL BOX - ACU

Next: End

DOMESTIC SIDE RESTRICTED OR BLOCKED

HEAT EXCHANGER - PLATE

Next: End

RESTRICTED OR BLOCKED

TURBINE

Next: End

RESTRICTED OR BLOCKED

FILTER - INSERT - DHW

Next: End

RESTRICTED OR BLOCKED

FLOW REGULATOR

Next: End

RESTRICTED OR BLOCKED

NOZZLE

Next: End

LOW CH OUTPUT EMS BUS - CH COOL

CONTROL BOX - ACU

Next: End

POOR CH OUTPUT EMS BUS - CH COOL

CONTROL BOX - ACU

Next: End

LOW CH OUTPUT WITH LLH EMS BUS - CH COOL

CONTROL BOX - ACU

Next: End

POOR CH OUTPUT LLH EMS BUS - CH COOL

CONTROL BOX - ACU

Next: End

LOW CH OUTPUTWIRELESS - CH COOL

CONTROL BOX - ACU

Next: End

POOR CH OUTPUTWIRELESS - CH COOL

CONTROL BOX - ACU

Next: End

LOW CH OUTPUT WITH LLHWIRELESS - CH COOL

CONTROL BOX - ACU

Next: End

POOR CH OUTPUT LLHWIRELESS - CH COOL

CONTROL BOX - ACU

Next: End

FAULTY RESISTANCES OUT

MOTOR - DIVERTER VALVE

Next: End

FAULTY NOT OPERATING FOR CH

MOTOR - DIVERTER VALVE

Next: End

SYSTEM CIRCULATION ISSUE

Next: End

RECTIFICATION ELECTRODE NOT ESTABLISHING DROPPING OUT AT MINIMUM

ELECTRODE - C/W SPRING

Next: End

WRONG MIX ON MINIMUM

GAS - VALVE

Next: End

NOT RUNNING FAULT CODE

FAN

Next: End

DISPLAYING FLOW THERMISOTR FAULT

CONTROL BOX - ACU

Next: End

FLOW THERMISTOR SECTION

HARNESS - 24V - CHG

Next: End

MK2 PCB AND CODE PLUG FITTED TO MK1 APPLIANCE

WRONG PARTS FITTED

Next: End

BLOCKED LOW PRESSURE WARNING

GAUGE - PRESSURE

Next: End

NO POWER

Next: End

BLANK FOROBSERVATION DISPLAY ILLUMINATES MAINS FUSE

Z REDIRECT

Next: End

BLANK FOR OBSERVATION DISPLAY ILLUMINATES INTERNAL FUSE

Z REDIRECT

Next: End

NO OUTPUT

CONTROL BOX - ACU

Next: End

LOW CAUSING ERROR ON STARTUP

SYSTEM PRESSURE

Next: End

DISPLAYING LOW PRESSURE ERROR INCORRECTLY

CONTROL BOX - ACU

Next: End

RESTRICTED CAUSING BAFFLING

FLUEWAYS

Next: End

PASSING TO RADIATORS

DIVERTER VALVE ASSEMBLY

Next: End

DHW TEMPERATURE CONTROL TOO HOT

CONTROL BOX - ACU

Next: End

RESTRICTED LOWERING OUTPUT

FLUEWAYS

Next: End

RESTRICTED OR BLOCKED DHW HOT AND COLD

HEAT EXCHANGER - PLATE

Next: End

RESTRICTED OR BLOCKED

PIPE - EXPANSION - VESSEL - 10L

Next: End

INNER SEALS BREACHED POOR FGA

FLUE

Next: End

WRONG MIX ON MAX AND MIN

GAS - VALVE

Next: End

RESTRICTED OR BLOCKED POOR DHW

HEAT EXCHANGER - PLATE

Next: End

STUCK IN OVERHEAT WILL NOT RESET

CONTROL BOX - ACU

Next: End

OVERHEAT THERMOSTAT SECTION

HARNESS - 24V - CHG

Next: End

NOT REGISTERING DEMAND TO FAN

CONTROL BOX - ACU

Next: End

NOT READING PRESSURE SENSOR VOLTAGE

CONTROL BOX - ACU

Next: End

NOT RUNNING DHW DEMAND

FAN

Next: End

NOT REGISTERING DEMAND

TURBINE

Next: End

NOT REGISTERING DHW DEMAND

CONTROL BOX - ACU

Next: End

FALSE FLAME FAULTS

NO FAULT - RESET AFTER LOCKOUT

Next: End

GAS VALVE SECTION

HARNESS - 24V - CHG

Next: End

BLANK FOR GAS VALVE ELECTRICAL FAULTS

Z REDIRECT

Next: End

BLANK FOR SYSTEM PRESSURE DROP

Z REDIRECT

Next: End

BLOCKED ERROR CODE

GAUGE - PRESSURE

Next: End

WRONG MIX CAUSING BAFFLING

GAS - VALVE

Next: End

FAULTY NOT OPERATING FOR CH (ALTERNATIVE TEST

MOTOR - DIVERTER VALVE

Next: End

FAULTY RESISTANCES OUT FOR DHW

MOTOR - DIVERTER VALVE

Next: End

FAULTY NOT OPERATING FOR DHW

MOTOR - DIVERTER VALVE

Next: End

240V CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1048

NO VOLTAGE CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1050

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1075

WIRELESS PREHEAT CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF PREHEAT CONTROLS

Next: p1135

240V PREHEAT CONROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF PREHEAT CONTROLS

Next: p1132

EMS BUS PREHEAT CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF PREHEAT CONTROLS

Next: p1131

NO PRESSURE DROP OBSERVED

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p1253

PRESSURE DROPS BELOW A SATISFACTORY LEVEL

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p1255

240V CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1399

NO VOLTAGE CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1401

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1403

240V CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1449

NO VOLTAGE CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1451

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1453

FROST PROTECTION TURNED ON AND OUTDOOR TEMPERATURE BELOW SET VALUE

CHARACTERISTIC TEST FROM OBSERVATION FROST PROTECTION SETTINGS

Next: !p1704

FROST PROTECTION TURNED ON AND OUTDOOR TEMPERATURE EXCEEDS SET VALUE

CHARACTERISTIC TEST FROM OBSERVATION FROST PROTECTION SETTINGS

Next: p1706

PUMP OVERRUN SETTING INCORRECT FOR THE SYSTEM

CHARACTERISTIC TEST FROM OBSERVATION PUMP OVERRUN

Next: !p1739

PUMP DOES NOT OVERRUN FOR THE TIME SET ON CH OR FOR THE TIME STATED FOR DHW

CHARACTERISTIC TEST FROM OBSERVATION PUMP OVERRUN

Next: !p1741

240V CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1783

NO VOLTAGE CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1785

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p1787

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p948

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p1110

BOILER GOES TO OVERHEAT BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: !p1904

TEMPERATURE EXCEEDS 88°C AND BOILER STILL FIRING

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: !p1906

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p1909

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p1911

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p1914

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p1916

BURNER DROPS OUT ON MAXIMUM RATE

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p1974

FLAME DROPS OUT AT MAXIMUM

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: p1979

FLAME DROPS OUT AT MINIMUM

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: p1981

FGA READINGS INCORRECT AT MAXIMUM

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: p1998

FGA READING INCORRECT AT MINIMUM

CHARACTERISTIC TEST FROM OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

Next: p2000

DISPLAY DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATES

Next: p2848

DISPLAY FLASHES

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATES

Next: p203

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p2095

WIRELESS KEY CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION EMS BUS OR WIRELESS KEY CONTROLS

Next: p2097

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2223

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2225

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2275

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2277

FAN DOES NOT RUN, NO FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS DHW DEMAND

Next: p238

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2383

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p2385

FAN RELATED FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS DHW DEMAND

Next: p240

FLOW SENSOR UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p255

INLET FILTER UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p257

REGULATOR UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p259

NOZZLES UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p261

EMS BUS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS

Next: p2636

WIRELSS CONTROLS

CHARACTERISTIC TEST FROM OBSERVATION TYPE OF HEATING CONTROLS - CH TEMPERATURE LOW

Next: p2637

LOW SYSTEM PRESSURE WARNING / FAULT

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p282

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE FLOW THERMISTOR AND HARNESS

Next: p2842

SYSTEM PRESSURE IS CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p285

FLOW THERMISTOR NOT FITTED

CHARACTERISTIC TEST FROM RESISTANCE FLOW THERMISTOR AND HARNESS

Next: !p2845

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p287

BURNER IGNITES BUT BAFFLES / NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p330

BURNER IGNITES BUT DOES NOT ESTABLISH (FLAME SYMBOL DOES NOT ILLUMINATE) - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p2129

BURNER DOES NOT IGNITE - IGNITION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p1191

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p1570

DHW TOO COOL, RADIATORS HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p528

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p536

BOILER CUTS OUT OR HOT WATER RUNS HOT COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p540

BOILER ATTEMPTS TO FIRE AFTER SELF CHECK

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p225

DHW TOO COOL, RADS COOL, BOILER STAYS LIT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2196

PUMP RUNS CONTINUOUSLY AFTER SELF CHECK

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p57

BOILER REACHES TEMPERATURE BUT SYSTEM DOES NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2380

BOILER TEMPERATURE AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2246

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p597

COMBUSTION TEST FAILED

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p2482

BURNER DROPS OUT ON MINIMUM RATE

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p2692

27/03/2023 14:49:52 2304_1_46_1 21/06/2023 10:46:39

13/04/2023 13:42:56

Next: End

RESISTANCE SOLENOID FILLING LOOP AND HARNESS

REMOVE THE FILLING SOLENOID CONNECTOR FROM THE PCB (PINK)

Next: p1009, f1010

RESISTANCE SOLENOID FILLING LOOP

REMOVE THE 2 WIRES FROM THE FILLING LOOP SOLENOID

Next: !p1011, !f1012

RESISTANCE RECTIFICATION CIRCUIT TO EARTH

{GAINPCBACS}
DISCONNECT LV1 FROM THE PCB

Next: p1027, f1017

RESISTANCE RECTIFICATION ELECTRODE TO EARTH

DISCONNECT RECTIFICATION LEAD FROM ELECTRODE (LEFT ELECTRODE)

Next: !p1018, !f1019

OBSERVATION TYPE OF PREHEAT CONTROLS

{GAINPCBACS}

Next: p2125, ?1126, ?1128, ?1130

OBSERVATION DIVERTER VALVE MOVEMENT (ALTERNATIVE - CH)

REMOVE DIVERTER MOTOR FROM ITS HOUSING AND PLACE IN A SAFE LOCATION TO OBSERVE ITS MOVEMENT

Next: !p1146, !f1147

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p1152, f1155

OBSERVATION LOW LOSS HEADER SETTINGS

Next: !p1156, !f1157

RESISTANCE IGNITION LEAD

DISCONNECT IGNITION LEAD FROM SPARK GENERATOR AND ELECTRODE ASSEMBLY

Next: p1234, !f1232

INSPECTION CONDENSATE

Next: p1242, !f1243

RESISTANCE GAS VALVE AND HARNESS

{GAINPCBACS}
DISCONNECT LV1 FROM THE PCB

Next: !p1258, f1259

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p1260, !f1261

RESISTANCE HARNESS GND CABLE

REMOVE CONNECTOR FROM THE MIDDLE ELECTRODE

Next: !p1304, !f1305

OBSERVATION OUTDOOR SENSOR FITTED?

Next: p1718, f1715

OBSERVATION OUTDOOR SENSOR FITTED?

Next: p1446, f1396

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR HV1 FROM THE PCB

Next: p2116, f139

RESISTANCE PUMP

REMOVE MAINS CONNECTION FROM PUMP

Next: !p140, !f141

OBSERVATION TYPE OF HEATING CONTROLS

{GAINPCBACS}

Next: p1397, ?1398, ?1400, ?1402

VOLTAGE CH DEMAND FROM BOARD

Next: !p1416, !f1417

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p1422, !f1423

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1427, !f1428

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1432, !f1433

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1437, !f1438

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1442, !f1443

VOLTAGE CH DEMAND FROM BOARD

Next: !p1474, !f1475

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1493, !f1485

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p1577, !f1578

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR LV2 FROM THE PCB

Next: !p162, f159

OBSERVATION DOES PUMP RUN

NO DEMAND

Next: p1588, f1593

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: !p160, !f161

OBSERVATION DOES PUMP RUN WITH DC CONNECTOR REMOVED?

REMOVE THE DC PUMP CONNECTOR
NO DEMAND

Next: p1594, f1595

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p1596, !f1597

OBSERVATION DOES PUMP RUN WITH DC CONNECTOR REMOVED?

REMOVE THE DC PUMP CONNECTOR
NO DEMAND

Next: p1605, f1606

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p1607, !f1608

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p1729, f1730

VOLTAGE PRESSURE SENSOR (PRESSURE)

{GAINPCBACS}

Next: !p180, f168

VOLTAGE PRESSURE SENSOR (PERMANENT)

Next: p170, !f171

OBSERVATION FROST PROTECTION SETTINGS

Next: p1702, ?1703, ?1705

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: !p1716, !f1717

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1724, !f1725

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p1731, !f1732

RESISTANCE FLOW THERMISTOR AND HARNESS

REMOVE CONNECTOR LV1 FROM THE PCB

Next: !p2837, ?2838, ?2840

TEMPERATURE APPLIANCE (FROST PROTECTION - FIRING)

Next: p1776, !f1777

RESISTANCE HEATING BLOCK THERMISTOR AND HARNESS

REMOVE CONNECTOR LV1 FROM THE PCB

Next: !p185, f182

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: !p1813, !f1814

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: !p1819, !f1820

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: !p183, !f234

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: !p1822, !f1823

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p1825, !f1826

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p1829, !f1830

RESISTANCE PUMP

REMOVE MAINS CONNECTION FROM PUMP

Next: !p1832, !f1833

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p1836, !f1837

VOLTAGE DC PUMP

REMOVE THE DC CONNECTOR FROM THE PUMP
ENSURE NO DEMAND

Next: !p1839, !f1840

RESISTANCE FAN

REMOVE CONNECTOR FROM FAN

Next: !p1842, !f1843

VOLTAGE FAN AT PCB

{GAINPCBACS}
REMOVE THE CONNECTOR FROM THE FAN ASSEMBLY AND MAKE SAFE

Next: !p1847, !f1848

RESISTANCE DIVERTER VALVE AND HARNESS

{GAINPCBACS}
DISCONNECT LV2 FROM THE PCB

Next: !p1850, !f1851

VOLTAGE DIVERTER VALVE AT PCB QADAI

DISCONNECT LV2 FROM THE PCB AND MAKE SAFE

Next: !p1853, !f1854

VOLTAGE DIVERTER VALVE AT PCB (ALTERNATIVE) QADAI

ISOLATE MAINS DHW AT

Next: !p1860, !f1859

INSPECTION PRESSURE SYSTEM

Next: p187, ?188, ?190

VOLTAGE FLOW TURBINE (DEMAND)

{GAINPCBACS}
RUN HOT WATER TAP AT A FLOW RATE OF 3 - 4 L/MIN

Next: !p1862, !f1863

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}

Next: !p1866, !f1867

RESISTANCE SPARK GENERATOR

UNPLUG MAINS CONNECTION FROM UNDERNEATH SPARK GENERATOR

Next: !p1870, !f1871

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: !p1897, !f2481

INFORMATION FLAME LOSS AFTER IGNITION FAULTS

Next: p1919, !f1928

INSPECTION FLUE

Next: p1950, !f1951

RESISTANCE RECTIFICATION LEAD

{GAINPCBACS}
DISCONNECT RECTIFICATION LEAD FROM ELECTRODE ASSEMBLY

Next: !p1960, !f1961

VOLTAGE MAINS POWER IN (LOW VOLTAGE)

{GAINPCBACS}

Next: p2018, !f2019

OBSERVATION HYDRAULIC SETTINGS

Next: p2024, !f2025

OBSERVATION BOILER RESET (FLAME MONITORING FAULT)

Next: !p2058, f2059

RESISTANCE RECTIFICATION CIRCUIT TO EARTH

{GAINPCBACS}
DISCONNECT LV1 FROM THE PCB

Next: p2070, f2061

RESISTANCE RECTIFICATION ELECTRODE TO EARTH

DISCONNECT RECTIFICATION LEAD FROM ELECTRODE (LEFT ELECTRODE)

Next: !p2062, !f2063

INSPECTION CONDENSATE

Next: p2082, !f2083

OBSERVATION EMS BUS OR WIRELESS KEY CONTROLS

Next: p2093, ?2094, ?2096

RESISTANCE FAN

REMOVE CONNECTOR FROM FAN

Next: !p2119, !f2120

RESISTANCE SPARK GENERATOR

UNPLUG MAINS CONNECTION FROM UNDERNEATH SPARK GENERATOR

Next: !p2123, !f2124

INSPECTION COMBUSTION SEALS

Next: !p2150, !f2151

OBSERVATION DIVERTER VALVE MOVEMENT (ALTERNATIVE - DHW)

REMOVE DIVERTER MOTOR FROM ITS HOUSING AND PLACE IN A SAFE LOCATION TO OBSERVE ITS MOVEMENT

Next: !p2193, !f2194

OBSERVATION WATER SUPPLY INTO BOILER

Next: p250, !f249

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p2641, f2642

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p2643, !f2644

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p2651, !f2652

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p2658, f2659

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p2660, !f2661

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: p2668, !f2669

RESISTANCE DIVERTER VALVE AND HARNESS

{GAINPCBACS}
DISCONNECT LV2 FROM THE PCB

Next: p2679, f2680

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT THE PLUG FROM THE DIVERTER MOTOR
REMOVE CONNECTOR LV2 FROM THE PCB

Next: !p2681, !f2682

RESISTANCE RECTIFICATION LEAD

{GAINPCBACS}
DISCONNECT RECTIFICATION LEAD FROM ELECTRODE ASSEMBLY

Next: !p2695, !f2696

RESISTANCE FUSE (MAINS FUSE)

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p2851, f2852

FURTHER INVESTIGATION MAINS FUSE

Next: !p2853, !f2854

FURTHER INVESTIGATION FUSE PCB

Next: !p2857, !f2858

INSPECTION FLUE

Next: p335, !f336

INSPECTION FLUE

Next: p559, !f560

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: !p587, !f588

INSPECTION COMBUSTION SEALS

Next: !p672, !f969

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: !p713, !f714

INSPECTION FLUE

Next: p725, !f726

VOLTAGE FAN AT PCB

{GAINPCBACS}
REMOVE THE CONNECTOR FROM THE FAN ASSEMBLY AND MAKE SAFE

Next: p735, !f736

OBSERVATION BOILER RESET (OVERHEAT)

ENSURE BOILER IS COOL

Next: p746, f747

RESISTANCE OVERHEAT STAT AND HARNESS

{GAINPCBACS}
DISCONNECT LV1 FROM THE PCB

Next: !p748, f749

RESISTANCE OVERHEAT STAT

DISCONNECT LEADS FROM OVERHEAT THERMOSTAT

Next: !p750, !f751

OBSERVATION BOILER RESET (FALSE FLAME FAULT)

Next: !p909, f1015

VOLTAGE FLOW TURBINE (DEMAND)

{GAINPCBACS}
RUN HOT WATER TAP AT A FLOW RATE OF 3 - 4 L/MIN

Next: !p835, f830

VOLTAGE FLOW TURBINE (PERMANENT)

Next: p831, !f832

RESISTANCE GAS VALVE AND HARNESS

{GAINPCBACS}
DISCONNECT LV1 FROM THE PCB

Next: p924, f920

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p921, !f922

INFORMATION FAULT CODE 2970

Next: !p939, !f940

INSPECTION CODE PLUG

Next: p1880, !f980

VOLTAGE DIVERTER VALVE AT PCB (ALTERNATIVE)

ISOLATE MAINS DHW AT

Next: !p992, !f993

RESISTANCE DIVERTER VALVE AND HARNESS

{GAINPCBACS}
DISCONNECT LV2 FROM THE PCB

Next: p995, f996

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT THE PLUG FROM THE DIVERTER MOTOR
REMOVE CONNECTOR LV2 FROM THE PCB

Next: !p997, !f998

VOLTAGE SOLENOID FILLING LOOP

{GAINPCBACS}

Next: !p1013, !f1014

INSPECTION CONDENSATE

Next: p1032, !f1028

INSPECTION ELECTRODES (FAULT CODE)

Next: !p1030, !f1031

PRESSURE TIGHTNESS TEST

Next: p1029, !f1036

VOLTAGE EXTERNAL FROST PROTECTION

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p1051, !f2111

OBSERVATION WIRELESS SIGNAL

Next: p1078, !f1070

OBSERVATION DISCONNECT 240V CONTROL DOES DEMAND END

DISCONNECT THE WIRING FROM THE 240V EXTERNAL CONTROLS AND MAKE SAFE

Next: !p1073, !f1074

OBSERVATION DISCONNECT NO VOLTAGE CONTROL DOES DEMAND END

REMOVE THE LOW VOLTAGE CONTROLS CONNECTOR (LIGHT BLUE) FROM THE PCB

Next: !p1071, !f1072

TEMPERATURE APPLIANCE (FROST PROTECTION - FIRING)

Next: p1059, !f1058

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p2708, !f1066

OBSERVATION DISCONNECT EMS BUS CONTROLS DOES DEMAND END

REMOVE THE EMS BUS C

Next: !p1076, !f1077

OBSERVATION DISCONNECT WIRELESS CONTROLS DOES DEMAND END

UNLOCK AND REMOVE WI

Next: !p1079, !f1080

INSPECTION PREHEAT LINK

{GAINPCBACS}

Next: p1140, !f1141

VOLTAGE PREHEAT DEMAND INTO BOILER

{GAINPCBACS}

Next: !p1134, !f1133

INSPECTION PREHEAT LINK

{GAINPCBACS}

Next: p1136, !f1139

OBSERVATION DISCONNECT KEY (PREHEAT)

UNLOCK AND REMOVE WIRELESS CONTROLS KEY (PULL DOWNWARDS)

Next: !p2114, !f1138

OBSERVATION DISCONNECT EMS BUS CONTROLS (PREHEAT)

REMOVE THE EMS BUS CONTROL CONNECTOR (LIGHT RED) FROM THE PCB AND MAKE SAFE

Next: !p1142, !f1143

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: !p1153, !f1154

OBSERVATION SPARKING AT ELECTRODE LEAD

WEDGE THE IGNITION LEAD BETWEEN THE 2 SPARK ELECTRODES AS SHOWN IN THE IMAGE

Next: p1271, f1228

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}

Next: p1235, !f1236

RESISTANCE HARNESS PCB TO SPARK GENERATOR

DISCONNECT THE BOTTOM CONNECTOR FROM SPARK GENERATOR

Next: !p1237, !f1238

PRESSURE FAN IGNITION

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p1240, f1241

PRESSURE GAS INLET AND DROP

ATTACH U-GAUGE TO IN

Next: p1250, ?1252, ?1254

INSPECTION FLUE

Next: p1244, !f1245

INSPECTION FAN BEARING PLATE

REMOVE FAN AND FAN BEARING PLATE (LOCATED ABOVE THE FAN)

Next: p1246, !f1247

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p1248, !f1249

INSPECTION VENTURI

Next: p1264, !f1265

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p1256, f1257

RESISTANCE HARNESS GAS VALVE

REMOVE CONNECTOR FROM GAS VALVE

Next: !p1262, !f2115

INSPECTION SPARK ELECTRODE

Next: p1268, !f1267

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p1269, !f1270

RESISTANCE ELECTRODE GND PATH

REMOVE THE LEAD FROM THE MIDDLE ELECTRODE

Next: p1239, f1303

OBSERVATION DISCONNECT HEATING KEY

UNLOCK AND REMOVE WIRELESS CONTROLS KEY (PULL DOWNWARDS)

Next: !p1420, f1421

VOLTAGE CH DEMAND INTO BOARD

{GAINPCBACS}

Next: p1414, f1415

OBSERVATION LINK NO VOLTAGE CONTROLS DOES BOILER RESPOND

REMOVE EXISTING WIRING FROM THE NO VOLTAGE CONTROLS CONNECTOR AND REPLACE IT WITH A WIRE LINK

Next: p1410, !f1411

OBSERVATION DISCONNECT EMS BUS CONTROLS DOES BOILER RESPOND

REMOVE THE EMS BUS CONTROL CONNECTOR (LIGHT RED) FROM THE PCB AND MAKE SAFE

Next: p1404, !f1405

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p1406, !f1407

OBSERVATION DISCONNECT OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR (DARK BLUE)

Next: !p1408, f1441

OBSERVATION DISCONNECT OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR (DARK BLUE)

Next: p1513, f1436

OBSERVATION DISCONNECT OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR (DARK BLUE)

Next: p1510, f1431

OBSERVATION DISCONNECT OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR (DARK BLUE)

Next: !p1424, f1426

INFORMATION / OBSERVATION CH PUMP SETTINGS

Next: !p1429, !f1430

INFORMATION / OBSERVATION CH PUMP SETTINGS

Next: !p1434, !f1435

INFORMATION / OBSERVATION CH PUMP SETTINGS

Next: !p1439, !f1440

INFORMATION / OBSERVATION CH PUMP SETTINGS

Next: !p1444, !f1445

OBSERVATION TYPE OF HEATING CONTROLS

{GAINPCBACS}

Next: p1447, ?1448, ?1450, ?1452

OBSERVATION DISCONNECT HEATING KEY

UNLOCK AND REMOVE WIRELESS CONTROLS KEY (PULL DOWNWARDS)

Next: !p1482, f1483

VOLTAGE CH DEMAND INTO BOARD

{GAINPCBACS}

Next: p1500, f1473

OBSERVATION LINK NO VOLTAGE CONTROLS DOES BOILER RESPOND

REMOVE EXISTING WIRING FROM THE NO VOLTAGE CONTROLS CONNECTOR AND REPLACE IT WITH A WIRE LINK

Next: p1505, !f1504

OBSERVATION DISCONNECT EMS BUS CONTROLS DOES BOILER RESPOND

REMOVE THE EMS BUS CONTROL CONNECTOR (LIGHT RED) FROM THE PCB AND MAKE SAFE

Next: p1454, !f1455

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1499, !f1457

INSPECTION NO VOLTAGE CONTROLS LINK

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1501, !f1503

INSPECTION 240V CONTROLS LINK

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1506, !f1507

INSPECTION NO VOLTAGE CONTROLS LINK

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1511, !f1512

INSPECTION 240V CONTROLS LINK

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: !p1514, !f1515

OBSERVATION CH OUTPUT SETTINGS

Next: p1615, !f1518

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p547, !f1538

OBSERVATION DOES PUMP RUN WITH DC CONNECTOR REMOVED?

REMOVE THE DC PUMP CONNECTOR
NO DEMAND

Next: p1582, f1576

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP
REMOVE SAFETY CLIP TO EXPOSE ELECTRICAL CONNECTORS

Next: !p1579, !f1580

RESISTANCE HARNESS PUMP DC

REMOVE THE DC PUMP CONNECTOR FROM THE PUMP

Next: p1583, !f1584

VOLTAGE DC PUMP

REMOVE THE DC CONNECTOR FROM THE PUMP
ENSURE NO DEMAND

Next: !p1585, !f1586

RESISTANCE HARNESS PUMP DC

REMOVE THE DC PUMP CONNECTOR FROM THE PUMP

Next: p1589, !f1590

VOLTAGE DC PUMP

REMOVE THE DC CONNECTOR FROM THE PUMP
ENSURE NO DEMAND

Next: !p1591, !f1592

RESISTANCE HARNESS PUMP DC

REMOVE THE DC PUMP CONNECTOR FROM THE PUMP

Next: p1600, !f1601

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP
REMOVE SAFETY CLIP TO EXPOSE ELECTRICAL CONNECTORS

Next: !p1598, !f1599

VOLTAGE DC PUMP

REMOVE THE DC CONNECTOR FROM THE PUMP
ENSURE NO DEMAND

Next: !p1602, !f1603

RESISTANCE HARNESS PUMP DC

REMOVE THE DC PUMP CONNECTOR FROM THE PUMP

Next: p1611, !f1612

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP
REMOVE SAFETY CLIP TO EXPOSE ELECTRICAL CONNECTORS

Next: !p1609, !f1610

VOLTAGE DC PUMP

REMOVE THE DC CONNECTOR FROM THE PUMP
ENSURE NO DEMAND

Next: !p1613, !f1614

OBSERVATION MAXIMUM FLOW TEMPERATURE SETTING

Next: p2611, !f1623

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p1652, f1645

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: p1655, !f1654

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p1722, f1723

OBSERVATION OUTDOOR SENSOR FITTED?

Next: p1694, f1701

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p1695, !f1696

TEMPERATURE LOW LOSS HEADER (FROST PROTECTION PUMP)

LOCATE THE LOW LOSS HEADER ON THE SYSTEM
(THIS MAY NOT BE NEXT TO THE APPLIANCE)

Next: p1697, !f2113

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: !p1699, !f1700

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR FROM PRESSURE SENSOR (BEHIND SIPHON, UNLOCK FOR ACCESS)

Next: !p174, !f173

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p1709, !f1710

RESISTANCE OUTDOOR SENSOR

REMOVE THE OUTDOOR TEMPERATURE SENSOR CONNECTOR FROM THE PCB (DARK BLUE)

Next: !p1707, !f1708

TEMPERATURE LOW LOSS HEADER (FROST PROTECTION PUMP)

LOCATE THE LOW LOSS HEADER ON THE SYSTEM
(THIS MAY NOT BE NEXT TO THE APPLIANCE)

Next: p1711, !f2112

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: !p1713, !f1714

OBSERVATION OUTDOOR SENSOR SETTINGS

Next: !p1719, !f1720

OBSERVATION HEATING CURVE SETTINGS

Next: !p1726, !f1727

OBSERVATION HEATING CURVE SETTINGS

Next: !p1733, !f1734

OBSERVATION MAX DHW SETTING

Next: !p1743, !f1745

OBSERVATION MAX DHW SETTING

Next: !p1747, !f1748

OBSERVATION EXTERNAL FROST THERMOSTAT FITTED?

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p1037, f1775

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p2728, !f1779

OBSERVATION TYPE OF HEATING CONTROLS

{GAINPCBACS}

Next: p1780, ?1782, ?1784, ?1786

OBSERVATION WIRELESS SIGNAL

Next: p1794, !f1795

OBSERVATION DISCONNECT 240V CONTROL DOES DEMAND END

DISCONNECT THE WIRING FROM THE 240V EXTERNAL CONTROLS AND MAKE SAFE

Next: !p1792, !f1793

OBSERVATION DISCONNECT NO VOLTAGE CONTROL DOES DEMAND END

REMOVE THE LOW VOLTAGE CONTROLS CONNECTOR (LIGHT BLUE) FROM THE PCB

Next: !p1790, !f1791

OBSERVATION DISCONNECT EMS BUS CONTROLS DOES DEMAND END

REMOVE THE EMS BUS C

Next: !p1788, !f1789

OBSERVATION DISCONNECT WIRELESS CONTROLS DOES DEMAND END

UNLOCK AND REMOVE WI

Next: !p1796, !f1797

VOLTAGE PRESSURE SENSOR (PRESSURE)

{GAINPCBACS}

Next: !p823, !f824

OBSERVATION BOILER RESET

Next: !p1873, !f1874

INSPECTION PCB AND APPLIANCE CONNECTIONS

Next: p1872, !f1879

INSPECTION CODE PLUG TYPE

Next: p981, !f1888

INSPECTION THERMISTOR FITMENT

Next: p1891, !f1890

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p1893, !f1892

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p2464, !f1894

DIFFERENTIAL PLATE HEAT EXCHANGER

ATTACH TEMPERATURE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: p2698, f1896

OBSERVATION RUN TO MAX TEMP-OVERHEAT OCCUR

ATTACH TEMPERATURE PROBE TO PIPE AS INDICATED BY THE RED ARROW

Next: !p1902, ?1903, ?1905

INSPECTION CONDENSATE

Next: p1921, !f1965

INSPECTION FLUE

Next: p1922, !f2005

INSPECTION VENTURI

Next: p1970, !f2149

PRESSURE GAS INLET

ATTACH U-GAUGE TO IN

Next: p331, !f1945

PRESSURE GAS INLET

ATTACH U-GAUGE TO IN

Next: p1947, !f1962

PRESSURE FAN IGNITION

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p1948, f1949

INSPECTION VENTURI

Next: p1956, !f1957

INSPECTION FAN BEARING PLATE

REMOVE FAN AND FAN BEARING PLATE (LOCATED ABOVE THE FAN)

Next: p1952, !f1953

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p1954, !f1955

VOLTAGE RECTIFICATION

{GAINPCBACS}

Next: !p1958, f1959

INSPECTION AIR INLET INTEGRITY

REFIT COMBUSTION CHA

Next: p2152, f2148

COMBUSTION TEST MAX AND MINIMUM

Next: p1977, ?1978, ?1980, ?1997, ?1999

PRESSURE GAS INLET (MAXIMUM RATE)

ATTACH U-GAUGE TO IN

Next: !p1975, !f1976

FURTHER INVESTIGATION FLAME LOSS AFTER IGNITION

TESTS SO FAR HAVE FO

Next: p1988, !f1992

PRESSURE GAS INLET (MAXIMUM RATE)

ATTACH U-GAUGE TO IN

Next: !p1982, !f1983

INSPECTION RECTIFICATION ELECTRODE

Next: !p1996, !f1985

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: p1987, !f1994

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FLUEWAYS INSPECTION PLATE

Next: !p1991, !f1995

INSPECTION RECTIFICATION ELECTRODE

Next: p1986, !f1993

PRESSURE GAS INLET (MAXIMUM RATE)

ATTACH U-GAUGE TO IN

Next: p2001, !f2002

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: p2007, !f2008

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: p2003, !f2004

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FLUEWAYS INSPECTION PLATE

Next: !p2006, !f2010

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FLUEWAYS INSPECTION PLATE

Next: !p2009, !f2011

OBSERVATION BOILER RESET

Next: !p2020, !f2021

OBSERVATION BOILER RESET

Next: !p2026, !f2027

OBSERVATION DISCONNECT FLOW SENSOR

DISCONNECT INLINE CONNECTOR TO FLOW SENSOR AND MAKE SAFE

Next: p221, !f222

RESISTANCE RECTIFICATION LEAD

{GAINPCBACS}
DISCONNECT RECTIFICATION LEAD FROM ELECTRODE ASSEMBLY

Next: p2071, !f2074

INSPECTION ELECTRODES (FAULT CODE)

Next: !p2072, !f2073

INSPECTION FLUE

Next: p2086, !f2085

OBSERVATION BOILER RESET (FLUE FAULT)

Next: p2186, !f2088

INSPECTION AIR INLET INTEGRITY

REFIT COMBUSTION CHA

Next: !p2089, !f2090

OBSERVATION BOILER RESET

Next: !p2098, !f2099

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p2100, !f2103

INSPECTION HEATING LINKS

GAIN ACCESS TO THE INCOMING CONNECTIONS AT THE PCB

Next: p2101, !f2102

OBSERVATION DISCONNECT EMS BUS CONTROLS FAULT CLEARED?

REMOVE THE EMS BUS CONNECTOR FROM THE PCB (LIGHT RED)

Next: p2106, !f2105

INSPECTION KEY WIRING CONNECTOR FITMENT

Next: !p2109, !f2110

INSPECTION BUS WIRING AND MAINS WIRING

LOCATE THE WIRING TO THE EMS BUS CONTROLS

Next: !p2107, !f2108

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR HV2 FROM THE PCB

Next: p2117, f2118

RESISTANCE SPARK GENERATOR AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p2121, f2122

INSPECTION PREHEAT LINK

{GAINPCBACS}

Next: !p2126, !f2127

INSPECTION CONDENSATE

Next: p1946, !f2147

INSPECTION COMBUSTION SEALS

Next: p1971, !f2185

INSPECTION COMBUSTION SEALS

Next: p2087, !f2190

INSPECTION PRESSURE SYSTEM

Next: p2299, ?2222, ?2224

OBSERVATION DISCONNECT LV2

DISCONNECT CONNECTOR LV2 FROM THE PCB (REFER TO PICTURE)

Next: !p223, !f266

INSPECTION PRESSURE SYSTEM

Next: p2351, ?2274, ?2276

OBSERVATION DISCONNECT FLOW TURBINE (DEMAND CHECK)

DISCONNECT FLOW TURBINE FROM ITS INLINE CONNECTOR AND MAKE SAFE
ENSURE CENTRAL HEATING TURNED OFF

Next: p1749, !f227

OBSERVATION TYPE OF HEATING CONTROLS

{GAINPCBACS}

Next: p1046, ?1047, ?1049, ?1067

OBSERVATION AIR IN BOILER AND SYSTEM

Next: p541, !f2298

OBSERVATION AIR IN BOILER AND SYSTEM

Next: p552, !f2325

OBSERVATION AIR IN BOILER AND SYSTEM

Next: p595, !f2379

OBSERVATION DHW FLOW RATE ON DISPLAY

SET FLOW RATE TO 3 L/MIN

Next: p813, f829

INSPECTION PRESSURE SYSTEM

Next: p2404, ?2382, ?2384

INSPECTION CH ISOLATION VALVE

Next: p2674, !f2387

VOLTAGE FAN AT PCB

{GAINPCBACS}
REMOVE THE CONNECTOR FROM THE FAN ASSEMBLY AND MAKE SAFE

Next: p241, !f245

OBSERVATION AIR IN BOILER AND SYSTEM

Next: p2381, !f2424

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p827, !f828

OBSERVATION AIR IN BOILER AND SYSTEM

Next: p2571, !f2459

INSPECTION EXTERNAL BYPASS

Next: p1895, !f2479

PRESSURE GAS INLET (MAXIMUM RATE)

ATTACH U-GAUGE TO IN

Next: p665, !f2498

INSPECTION DHW ISOLATION VALVE

Next: p251, !f252

INSPECTION FLOW COMPONENTS

DRAIN THE DOMESTIC H

Next: !p253, ?254, ?256, ?258, ?260

INSPECTION THERMISTOR FITMENT

Next: p557, !f2530

INSPECTION THERMISTOR FITMENT

Next: p543, !f2545

INSPECTION THERMISTOR FITMENT

Next: p602, !f2570

INSPECTION CH ISOLATION VALVE

Next: p754, !f2605

TEMPERATURE TAP AND BOILER DISCREPANCY

Next: p1742, !f2610

OBSERVATION TYPE OF HEATING CONTROLS - CH TEMPERATURE LOW

{GAINPCBACS}

Next: p1637, ?2630, ?2632

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p268, !f270

OBSERVATION DISCONNECT EMS BUS CONTROLS - CH TEMPERATURE LOW

REMOVE THE EMS BUS CONTROL CONNECTOR (LIGHT RED) FROM THE PCB AND MAKE SAFE

Next: p2638, !f2673

OBSERVATION DISCONNECT WIRELESS CONTROLS - CH TEMPERATURE LOW

UNLOCK AND REMOVE WIRELESS CONTROLS KEY (PULL DOWNWARDS)

Next: p2655, !f2672

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p2639, f2640

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: p2647, !f2648

OBSERVATION HEATING CURVE SETTINGS

Next: !p2645, !f2646

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p2649, f2650

OBSERVATION HEATING CURVE SETTINGS

Next: !p2653, !f2654

OBSERVATION LOW LOSS HEADER SENSOR FITTED?

Next: p2656, f2657

RESISTANCE LOW LOSS HEADER SENSOR

REMOVE THE LOW LOSS HEADER SENSOR CONNECTOR FROM THE PCB (LIGHT GREEN)

Next: p2664, !f2665

OBSERVATION HEATING CURVE SETTINGS

Next: !p2662, !f2663

OBSERVATION OUTDOOR SENSOR FITTED?

Next: !p2666, f2667

OBSERVATION HEATING CURVE SETTINGS

Next: !p2670, !f2671

PUMP LIMPET TEST

Next: p2675, !f2676

OBSERVATION DIVERTER MOTOR MOVEMENT CH

REMOVE DIVERTER MOTOR FROM ITS HOUSING AND PLACE IN A SAFE LOCATION TO OBSERVE ITS MOVEMENT

Next: p2677, f2678

INSPECTION DIVERTER BODY

REMOVE THE DIVERTER

Next: p2685, !f2686

VOLTAGE DIVERTER VALVE AT PCB

DISCONNECT LV2 FROM THE PCB AND MAKE SAFE

Next: !p2683, !f2684

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p820, !f271

INSPECTION EXTERNAL BYPASS

Next: p2687, !f2688

OBSERVATION PUMP OUTPUT SETTINGS

Next: !p2689, !f2690

VOLTAGE RECTIFICATION

{GAINPCBACS}

Next: !p2697, f2694

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: p1901, !f2705

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p226, !f2727

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p1778, !f2747

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p1672, !f2771

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p1516, !f2836

INSPECTION PRESSURE SYSTEM

Next: p283, ?284, ?286

VOLTAGE PRESSURE SENSOR (PRESSURE)

{GAINPCBACS}

Next: !p288, !f826

RESISTANCE FLOW THERMISTOR (FAULT CODE)

DISCONNECT LEADS TO FLOW THERMISTOR

Next: !p2843, !f2844

VOLTAGE MAINS POWER IN

{GAINPCBACS}

Next: p2849, f2850

RESISTANCE FUSE (PCB)

REMOVE THE FUSE FROM ITS HOUSING

Next: p2860, f2856

OBSERVATION DISCONNECT FLOW SENSOR - BLANK DISPLAY

DISCONNECT INLINE CONNECTOR TO FLOW SENSOR AND MAKE SAFE

Next: p2861, !f2862

OBSERVATION DISCONNECT LV2 - BLANK DISPLAY

DISCONNECT CONNECTOR LV2 FROM THE PCB (REFER TO PICTURE)

Next: !p2865, !f2864

INSPECTION CONDENSATE

Next: p1929, !f332

PRESSURE FAN IGNITION

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p333, f334

INSPECTION FLUE

Next: p477, !f501

INSPECTION FAN BEARING PLATE

REMOVE FAN AND FAN BEARING PLATE (LOCATED ABOVE THE FAN)

Next: p337, !f338

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p339, !f340

INSPECTION VENTURI

Next: p965, !f488

OBSERVATION DIVERTER MOTOR MOVEMENT DHW

REMOVE DIVERTER MOTOR FROM ITS HOUSING AND PLACE IN A SAFE LOCATION TO OBSERVE ITS MOVEMENT

Next: !p529, f994

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: !p537, !f538

INSPECTION PRESSURE SYSTEM

Next: p2282, ?1913, ?1915

PUMP LIMPET TEST

Next: p2531, !f544

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: p545, !f546

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p1532, !f548

DIFFERENTIAL PLATE HEAT EXCHANGER

ATTACH TEMPERATURE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: p1746, f586

PRESSURE GAS INLET

ATTACH U-GAUGE TO IN

Next: p553, !f554

PUMP LIMPET TEST

Next: p555, !f556

PRESSURE FAN MAX RATE

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2516, f558

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: p715, !f566

INSPECTION FAN BEARING PLATE

REMOVE FAN AND FAN BEARING PLATE (LOCATED ABOVE THE FAN)

Next: p561, !f2128

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p563, !f564

RESISTANCE HEATING BLOCK THERMISTOR

REMOVE CONNECTOR FROM THE HEATING BLOCK THERMISTOR

Next: p710, !f568

TEMPERATURE APPLIANCE (FROST PROTECTION - PUMP)

Next: p58, !f59

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p2748, !f235

INSPECTION CH ISOLATION VALVE

Next: p600, !f601

PRESSURE EXPANSION VESSEL

PRIMARY HEATING WATER DRAINED AND DISCHARGED

Next: !p598, !f599

PUMP LIMPET TEST

Next: p2546, !f603

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p2772, !f605

INSPECTION AIR INLET INTEGRITY

REFIT COMBUSTION CHA

Next: p670, f671

INSPECTION VENTURI

Next: p679, !f700

INSPECTION CONDENSATE

Next: p681, !f682

INSPECTION COMBUSTION SEALS

Next: p702, !f968

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: p703, !f704

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FLUEWAYS INSPECTION PLATE

Next: !p705, !f2195

DIFFERENTIAL PLATE HEAT EXCHANGER

ATTACH TEMPERATURE CLAMP TO RETURN PIPE ABOVE PUMP AS SHOWN

Next: p2606, f712

RESISTANCE FLOW THERMISTOR

DISCONNECT LEADS TO FLOW THERMISTOR

Next: p565, !f723

INSPECTION CONDENSATE

Next: p727, !f728

PRESSURE TIGHTNESS TEST

Next: !p2461, !f730

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p2707, !f2706

INSPECTION PRESSURE SYSTEM

Next: p2425, ?1908, ?1910

OBSERVATION DOES PUMP RUN

NO DEMAND

Next: p756, f1604

PUMP LIMPET TEST

Next: p1889, !f767

RESISTANCE DHW THERMISTOR

REMOVE CONNECTOR FROM DHW SENSOR

Next: p262, !f819

VOLTAGE MAINS POWER IN (LOW VOLTAGE)

{GAINPCBACS}

Next: !p821, !f822

RESISTANCE HARNESS FLOW TURBINE

DISCONNECT THE INLINE PLUG FROM THE FLOW SENSOR

Next: !p833, !f834

OBSERVATION BOILER RESET

Next: !p925, !f926

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p966, !f967

OBSERVATION DISCONNECT PRESSURE SENSOR

REMOVE CONNECTOR FROM THE PRESSURE SENSOR AND MAKE SAFE

Next: p1875, !f983

VOLTAGE DIVERTER VALVE AT PCB

DISCONNECT LV2 FROM THE PCB AND MAKE SAFE

Next: !p999, !f1000

System Information

  • Total Tests: 979
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control