XSol Diagnostic System

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:

4707723 BAXI 424 COMBI

WARNING - IMPORTA

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &4655, !f2

OBSERVATION FAN RUNS

Next: &1392, !f3012

OPERATION CH

Next: &2472, ?538, ?540, ?542

OBSERVATION BURNER IGNITION & ESTABLISH

Next: &1281, ?270, ?276, ?1502

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &1273, !f514

OBSERVATION DHW FLOW RATE

Next: &1438, f1274

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS PRESSURE INLET TEST POINT

Next: &1283, !f1282

OPERATION DHW

Next: &1307, ?1284, ?1286, ?1288, ?1290

COMBUSTION PERFORMANCE ANALYSIS

Next: &1309, f2981

OBSERVATION CH DEMAND RECOGNISED

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: &44, f2827

TEMPORARY FAULT CODES

Next: &nff, !f1526

PERMANENT FAULT CODES

Next: &nff, !f1344

OBSERVATION PUMP RUNS

Next: &269, f1509

OBSERVATION DHW DEMAND RECOGNISED

TURN HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: &29, f1439

HEADER FOR FUSE INVESTIGATION

OK TO BE BLANK

Next: &nff, f2195

HEADER FOR LOW SYSTEM WATER PRESSURE FAULT CODES H02 06 E02 07

OK TO BE BLANK

Next: &nff, f3945

HEADER FOR JUMPER FAULT CODES E02 19, 20,21

OK TO BE BLANK

Next: &nff, f4483

HEADER FOR FLUE SENSOR ERROR CODES

OK TO BE BLANK

Next: &nff, f3879

HEADER FOR RETURN SENSOR ERROR CODES

OK TO BE BLANK

Next: &nff, f3888

HEADER FOR FLOW SENSOR ERROR CODES

OK TO BE BLANK

Next: &nff, f3897

HEADER FOR ERROR CODE E02 00 BOILER RESET IN PROGRESS

OK TO BE BLANK

Next: &nff, f2271

HEADER FOR ERROR CODE E01 20 MAX FLUE GAS TEMP REACHED

OK TO BE BLANK

Next: &nff, f4032

HEADER FOR ERROR CODE E04 12 FALSE FLAME SIGNAL

OK TO BE BLANK

Next: &nff, f4319

HEADER FOR ERROR CODE H03 01 COMM ERROR

OK TO BE BLANK

Next: &nff, f2316

HEADER FOR ERROR CODE E01 11 INCORRECT FAN SPEED

OK TO BE BLANK

Next: &nff, f4472

HEADER FOR ERROR CODE E04 08 MAX SAFE TEMP REACHED SAFETY STAT OL

OK TO BE BLANK

Next: &nff, f4376

ERROR CODES H01 05, H01 08, H01 14, H01 18, H01 21

OK TO BE BLANK

Next: &nff, f2397

OBSERVATION PUMP OVERRUN

Next: &nff, !f2473

INITIAL SETUP INFORMATION PAGE

Next: &513, !f2862

HOW TO ACTIVATE THE CHIMNEY SWEEP MODE

Next: &nff, !f2918

ERROR CODES E02 47, E02 48

OK TO BE BLANK

Next: &nff, !f3095

HEADER FOR ERROR CODE E01 02

OK TO BE BLANK

Next: &nff, f4426

HEADER FOR RESET E ERROR CODES

OK TO BE BLANK

Next: &nff, f3503

HOW TO SET APPLIANCE TO MAX RATE

NOTE.
THE

Next: &nff, !f3811

OBSERVATION APPLIANCE INITIALISATION

ENSURE NO DEMANDS ARE PRESENT

Next: &2861, ?4656, ?4658, ?4660, ?4662

HEADER FOR H01 00 ERROR CODE

OK TO BE BLANK

Next: &nff, !f4972

POOR FLOW RATE

PACK - TAP

Next: End

POOR FLOW RATE

MAINS WATER SUPPLY

Next: End

POOR FLOW RATE

DHW CARTRIDGE

Next: End

TOO LOW

GAS INLET PRESSURE

Next: End

DHW RUNS HOT THEN COLD

SYSTEM PRESSURE

Next: End

DHW RUNS HOT THEN COLD

SENSOR (FLOW)

Next: End

DHW RUNS HOT THEN COLD

SENSOR (RETURN)

Next: End

DHW RUNS HOT THEN COLD

PUMP

Next: End

PERMANENT FAULT CODES

ERROR CODES

Next: End

PUMP DOES NOT RUN

COMBUSTION CONTROL UNIT

Next: End

TEMPORARY FAULT CODES

ERROR CODES

Next: End

PUMP DOES NOT RUN

HARNESS - WIRING - PUMP

Next: End

DHW TOO HOT

SENSOR (FLOW)

Next: End

RADS HEATING WITH NO DEMAND

COMBUSTION CONTROL UNIT

Next: End

RADS HEATING WITH NO DEMAND

WIRING - 3 WAY VALVE MOTOR

Next: End

POOR HW RADS REMAIN COOL

SYSTEM PRESSURE

Next: End

POOR HW RADS REMAIN COOL

SENSOR (FLOW)

Next: End

DHW TOO HOT

SENSOR (RETURN)

Next: End

BOILER UP TO TEMP RADS COOL

FLOW AND RETURN ISOLATION VALVES

Next: End

BOILER AND SYSTEM TEMP LOW

SENSOR (FLOW)

Next: End

BOILER AND SYSTEM TEMP LOW

SENSOR (RETURN)

Next: End

BURNER IGNITION

GAS INLET PRESSURE

Next: End

IGNITES BUT DOES NOT ESTABLISH

LEAD IGNITION ELECTRODE

Next: End

CASE OFF

ERROR CODES

Next: End

BOILER NOISY

COMBUSTION SEALS

Next: End

BOILER NOISY/BAFFLES

SILENCER

Next: End

BOILER NOISY

BURNER ASSEMBLY

Next: End

BOILER NOISY

CONDENSATE TRAP AND SYPHON

Next: End

FUSE INVESTIGATION

DIVERTER VALVE COMPONENTS

Next: End

FUSE INVESTIGATION

3 WAY VALVE MOTOR HEAD

Next: End

FUSE INVESTIGATION

COMBUSTION CONTROL UNIT

Next: End

FUSE INVESTIGATION 2

COMBUSTION CONTROL UNIT

Next: End

BOILER RESET IN OPERATION

NORMAL OPERATION

Next: End

ERROR CODE H03 01 COM ERROR

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE H0301 COM ERROR

WIRING - LOW VOLTAGE

Next: End

OUT OF CALIBRATION

SENSOR (FLOW)

Next: End

TEMP FAULT CODES

WIRING - SENSORS

Next: End

LOW

SYSTEM PRESSURE

Next: End

INCORRECTLY FITTED

SENSOR FITMENT

Next: End

PARTIALLY/FULLY CLOSED

FLOW AND RETURN ISOLATION VALVES

Next: End

WEAK

PUMP

Next: End

NO VOLTAGE TO PUMP

COMBUSTION CONTROL UNIT

Next: End

TEMP FAULT CODES

HARNESS - WIRING - PUMP

Next: End

BLOCKED / RESTRICTED

FILTER - CH

Next: End

RESTRICTED

HEAT EXCHANGER ASSEMBLY

Next: End

BOILER AND SYSTEM TEMP LOW CH

JUMPER POSITIONS

Next: End

INCORRECT PUMP OVERRUN

COMBUSTION CONTROL UNIT

Next: End

PUMP OVERRUN

COMBUSTION CONTROL UNIT

Next: End

SPARKING NO IGNITION

IGNITION ELECTRODE ASSEMBLY

Next: End

INCORRECT SPARK GAP TO BURNER

IGNITION ELECTRODE ASSEMBLY (GAP TO BURNER)

Next: End

INCORRECT FAN PRESSURE

CONDENSATE TRAP AND SYPHON

Next: End

INCORRECT FAN PRESSURE

BURNER ASSEMBLY

Next: End

INCORRECT FAN PRESSURE

HEAT EXCHANGER FLUEWAYS

Next: End

INCORRECT FAN PRESSURE

FLUE

Next: End

RESTRICTED CAUSING EXCESSIVE FAN PRESSURE

SILENCER

Next: End

IGNITES BUT DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

IGNITES BUT DOES NOT ESTABLISH

CONDENSATE TRAP AND SYPHON

Next: End

IGNITES BUT DOES NOT ESTABLISH

SILENCER

Next: End

IGNITES BUT DOES NOT ESTABLISH

IGNITION ELECTRODE ASSEMBLY

Next: End

INITIAL SETUP PAGE INFO

ERROR CODES

Next: End

NO VOLTAGE TO HALL SENSOR

COMBUSTION CONTROL UNIT

Next: End

FAN DOES NOT RUN

WIRING - SENSORS

Next: End

TURBINE NOT SPINNING FREELY

DHW CARTRIDGE

Next: End

ACTIVATING CHIMNEY SWEEP FUNCTION

ERROR CODES

Next: End

SPARKING PRESENT BUT DOES NOT IGNITE

LEAD IGNITION ELECTRODE

Next: End

BURNER DOES NOT IGNITE

COMBUSTION CONTROL UNIT

Next: End

FLAT

EXPANSION VESSEL

Next: End

FAILED COMBUSTION TEST

CONDENSATE TRAP AND SYPHON

Next: End

FAILED COMBUSTION TEST

COMBUSTION SEALS

Next: End

FAILED COMBUSTION TEST

SILENCER

Next: End

FAILED COMBUSTION TEST

BURNER ASSEMBLY

Next: End

FAILED COMBUSTION TEST 2

COMBUSTION CONTROL UNIT

Next: End

UNABLE TO ADJUST GAS VALVE 2

COMBUSTION CONTROL UNIT

Next: End

COMBUSTION PERFORMANCE ANALYSIS

COMBUSTION VALUE ADJUSTMENT

Next: End

FAILED COMBUSTION TEST

HEAT EXCHANGER FLUEWAYS

Next: End

FAN DOES NOT RUN

COMBUSTION CONTROL UNIT

Next: End

BOILER NOISY

GAS INLET PRESSURE

Next: End

POOR HW RADS REMAIN COOL

PUMP

Next: End

FAILED GAS RATE POOR HW

CONDENSATE TRAP AND SYPHON

Next: End

FAILED GAS RATE POOR HW

SILENCER

Next: End

FAILED GAS RATE POOR HW

BURNER ASSEMBLY

Next: End

FAILED GAS RATE POOR HW

HEAT EXCHANGER FLUEWAYS

Next: End

FAILED GAS RATE POOR HW

FLUE

Next: End

POOR HW RADS COOL

EXTERNAL MIXING

Next: End

POOR HW RADS REMAIN COOL

SENSOR (RETURN)

Next: End

ERROR CODES E02 47 48

EXTERNAL DEVICE

Next: End

FUSE INVESTIGATION 2

PUMP

Next: End

FUSE INVESTIGATION

PUMP

Next: End

BOILER NOISY

HEAT EXCHANGER FLUEWAYS

Next: End

E CODES NOT RESETTING

COMBUSTION CONTROL UNIT

Next: End

BOILER UP TO TEMP RADS COLD

PUMP

Next: End

BOILER UP TO TEMP RADS COLD

CARTRIDGE - BYPASS

Next: End

BOILER UP TO TEMP RADS COLD

FILTER - CH

Next: End

BOILER UP TO TEMP RADS COLD

COMBUSTION CONTROL UNIT

Next: End

BOILER UP TO TEMP RADS COLD

WIRING - 3 WAY VALVE MOTOR

Next: End

OUT OF CALIBRATION 1

SENSOR (FLOW)

Next: End

TEMP FAULT CODES 3

WIRING - SENSORS

Next: End

BLOCKED

HYDRAULIC BLOCK - RIGHT SECTION

Next: End

SETTING APPLIANCE TO MAX RATE

ERROR CODES

Next: End

BOILER NOISY

FLUE

Next: End

FAILED FLUE INTEGRITY TEST

FLUE

Next: End

FLUE SENSOR ERROR CODE

COMBUSTION CONTROL UNIT

Next: End

RETURN SENSOR ERROR CODES

COMBUSTION CONTROL UNIT

Next: End

FLOW SENSOR ERROR CODES

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 20

WIRING - SENSORS

Next: End

ERROR CODE E01 20

SENSOR (FLOW)

Next: End

E01 20

WIRING - SENSORS

Next: End

ERROR CODE E01 20

SYSTEM PRESSURE

Next: End

ERROR CODE E01 20

HYDRAULIC BLOCK - RIGHT SECTION

Next: End

ERROR CODE E01 20 NO VOLTAGE TO PUMP

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 20

HARNESS - WIRING - PUMP

Next: End

ERROR CODE E01 20 FAILED LIMPET

PUMP

Next: End

ERROR CODE E01 20

CONDENSATE TRAP AND SYPHON

Next: End

ERROR CODE E01 20

SILENCER

Next: End

ERROR CODE E01 20

BURNER ASSEMBLY

Next: End

ERROR CODE E01 20

SENSOR FITMENT

Next: End

FAULT CODE E01 20

WIRING - SENSORS

Next: End

ERROR CODE E04 12

POLARITY

Next: End

ERROR CODE E04 12 GAS VALVE PASSING

COMBUSTION CONTROL UNIT

Next: End

LOW PRESSURE ERROR CODES

HYDRAULIC BLOCK - RIGHT SECTION

Next: End

LOW PRESSURE FAULT CODES

SYSTEM PRESSURE

Next: End

LOW PRESSURE

COMBUSTION CONTROL UNIT

Next: End

FLUE SENSOR ERROR CODES

WIRING - SENSORS

Next: End

RETURN SENSOR ERROR CODES

WIRING - SENSORS

Next: End

FLOW SENSOR ERROR CODES

SENSOR (FLOW)

Next: End

ERROR E04 12 FALSE FLAME SIGNAL

IGNITION ELECTRODE ASSEMBLY

Next: End

ERROR CODE E04 08

SYSTEM PRESSURE

Next: End

ERROR CODE E04 08

HYDRAULIC BLOCK - RIGHT SECTION

Next: End

ERROR CODE E04 08

FLOW AND RETURN ISOLATION VALVES

Next: End

ERROR CODE E0 408

SENSOR (FLOW)

Next: End

FAULT CODE E04 08

WIRING - SENSORS

Next: End

E04 08

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E04 08

HARNESS - WIRING - PUMP

Next: End

ERROR CODE E04 08

PUMP

Next: End

FAILED PUMP OVERRUN

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E08 04

HEAT EXCHANGER ASSEMBLY

Next: End

ERROR CODE E08 04

FILTER - CH

Next: End

ERROR CODE E04 08

LIMIT THERMOSTAT

Next: End

ERROR CODE E01 02

SYSTEM PRESSURE

Next: End

ERROR CODE E01 02

HYDRAULIC BLOCK - RIGHT SECTION

Next: End

ERROR CODE E01 02

SENSOR FITMENT

Next: End

ERROR CODE E01 02

PIPEWORK CONFIGURATION

Next: End

ERROR CODE E01 02

FLOW AND RETURN ISOLATION VALVES

Next: End

E01 02

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 02

HARNESS - WIRING - PUMP

Next: End

E01 02

PUMP

Next: End

ERROR CODE E01 02

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 02

HEAT EXCHANGER ASSEMBLY

Next: End

ERROR CODE E01 02

FILTER - CH

Next: End

ERROR CODE E01 02

SENSOR (FLOW)

Next: End

E01 02

WIRING - SENSORS

Next: End

ERROR CODE E01 11

CONDENSATE TRAP AND SYPHON

Next: End

ERROR CODE E01 11

SILENCER

Next: End

ERROR CODE E01 11

BURNER ASSEMBLY

Next: End

ERROR CODE E0 11

HEAT EXCHANGER FLUEWAYS

Next: End

ERROR CODE E01 11

FLUE

Next: End

FAULT CODES E02 19 20 21

JUMPER POSITIONS

Next: End

CH DOES NOT RESPOND 2

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND 2

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 6

WIRING - LOW VOLTAGE

Next: End

CH DOES NOT RESPOND 6

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND 8

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 8

WIRING - LOW VOLTAGE

Next: End

NO CH

WIRING - LOW VOLTAGE

Next: End

NO CH 1

WIRING - LOW VOLTAGE

Next: End

CH DOES NOT RESPOND 5

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND 5

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 7

WIRING - LOW VOLTAGE

Next: End

CH DOES NOT RESPOND 3

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND 3

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 5

WIRING - LOW VOLTAGE

Next: End

CH DOES NOT RESPOND 4

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND 4

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 4

WIRING - LOW VOLTAGE

Next: End

CH DOES NOT RESPOND

CONNECTOR - TIMER BRIDGE

Next: End

CH DOES NOT RESPOND

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

CH DOES NOT RESPOND 3

WIRING - LOW VOLTAGE

Next: End

PUMP RUNS CONTINUOUS

SENSOR (FLOW)

Next: End

PUMP RUNS CONTINUOUS

SENSOR (RETURN)

Next: End

ERROR CODES

ERROR CODES

Next: End

BOILER FIRES WITH NO DEMAND

SENSOR (FLOW)

Next: End

BOILER FIRES WITH NO DEMAND

SENSOR (RETURN)

Next: End

ON WITH NO DEMAND 2

CONNECTION BOARD - WIRING

Next: End

ON WITH NO DEMAND

CONNECTION BOARD - WIRING

Next: End

BOILER FIRES WITH NO DEMAND

PLUMBING ISSUE

Next: End

NO CH 3

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 7

WIRING - LOW VOLTAGE

Next: End

NO CH 2

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 6

WIRING - LOW VOLTAGE

Next: End

NO CH

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 2

WIRING - LOW VOLTAGE

Next: End

NO CH 1

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 3

WIRING - LOW VOLTAGE

Next: End

NO CH 5

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 5

WIRING - LOW VOLTAGE

Next: End

NO CH 4

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO CH 4

WIRING - LOW VOLTAGE

Next: End

BLOWN POWER UP SELF TEST

FUSE (MAINS)

Next: End

BLANK DISPLAY

CONNECTION BOARD - WIRING

Next: End

BLOWN POWER UP SELF TEST

FUSE F1

Next: End

BLANK DISPLAY

WIRING - LOW VOLTAGE

Next: End

PUMP RUNS CONTINUOUS NO DISPLAY

SENSOR (FLOW)

Next: End

PUMP RUNS CONTINUOUS NO DISPLAY

SENSOR (RETURN)

Next: End

BOILER FIRES WITH NO DEMAND NO DISPLAY

SENSOR (FLOW)

Next: End

BOILER FIRES WITH NO DEMAND NO DISPLAY

SENSOR (RETURN)

Next: End

BOILER FIRES WITH NO DEMAND NO DISPLAY

PLUMBING ISSUE

Next: End

ON WITH NO DEMAND BLANK DISPLAY

CONNECTION BOARD - WIRING

Next: End

ON WITH NO DEMAND NO DISPLAY

CONNECTION BOARD - WIRING

Next: End

PUMP DOES NOT RUN NO DISPLAY

COMBUSTION CONTROL UNIT

Next: End

PUMP DOES NOT RUN NO DISPLAY

HARNESS - WIRING - PUMP

Next: End

POOR FLOW RATE NO DISPLAY

PACK - TAP

Next: End

POOR FLOW RATE NO DISPLAY

MAINS WATER SUPPLY

Next: End

POOR FLOW RATE NO DISPLAY

DHW CARTRIDGE

Next: End

NO VOLTAGE TO HALL SENSOR NO DISPLAY

COMBUSTION CONTROL UNIT

Next: End

FAN DOES NOT RUN NO DISPLAY

WIRING - SENSORS

Next: End

TURBINE NOT SPINNING FREELY NO DISPLAY

DHW CARTRIDGE

Next: End

BLANK DISPLAY

PCB - HMI CONTROL

Next: End

ERROR CODE H01 00

COMBUSTION CONTROL UNIT - COMM ERROR

Next: End

DIAGNOSTIC PROCEDURE

ERROR CODES

Next: End

POOR FLOW RATE

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

DHW RUNS HOT THEN COLD

COMBUSTION CONTROL UNIT

Next: End

DHW RUNS HOT THEN COLD

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

DOES NOT RUN

PUMP

Next: End

RADS HEATING WITH NO DEMAND

3 WAY VALVE MOTOR HEAD

Next: End

DHW TOO HOT

COMBUSTION CONTROL UNIT

Next: End

BOILER AND SYSTEM TEMP LOW

COMBUSTION CONTROL UNIT

Next: End

FUSE INVESTIGATION

WIRING - 3 WAY VALVE MOTOR

Next: End

FUSE INVESTIGATION

FUSE FURTHER INVESTIGATION

Next: End

ERROR CODE E02 00

PCB - HMI CONTROL (RESET BUTTON)

Next: End

ERROR CODE H03 01 COM ERROR

PCB - HMI CONTROL

Next: End

UNABLE TO RESET / SENSORS OK

COMBUSTION CONTROL UNIT

Next: End

TEMP FAULT CODES 1

WIRING - SENSORS

Next: End

OUT OF CALIBRATION

SENSOR (RETURN)

Next: End

DHW RUNS HOT THEN COLD

HEAT EXCHANGER ASSEMBLY

Next: End

TEMP FAULT CODES

PUMP

Next: End

TEMP FAULT CODES

COMBUSTION CONTROL UNIT

Next: End

BLOCKAGE

Next: End

RESTRICTED

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

GAS VALVE NOT OPENING

COMBUSTION CONTROL UNIT

Next: End

NO IGNITION

COMBUSTION CONTROL UNIT

Next: End

FAN RESTRICTED

COMBUSTION CONTROL UNIT

Next: End

FAN VENTURI RESTRICTED/BLOCKED

COMBUSTION CONTROL UNIT

Next: End

DOES NOT RECOGNISE CH DEMAND

COMBUSTION CONTROL UNIT

Next: End

NO VOLTAGE AT MAIN PCB CH

COMBUSTION CONTROL UNIT

Next: End

CH DOES NOT RESPOND 4

Next: End

DOES NOT RESPOND TO CH DEMAND 2

COMBUSTION CONTROL UNIT

Next: End

DOES NOT RESPOND TO CH DEMAND 3

COMBUSTION CONTROL UNIT

Next: End

CH DOES NOT RESPOND

Next: End

NOT RECOGNISING DEMAND

COMBUSTION CONTROL UNIT

Next: End

FAN DOES NOT RUN

HALL SENSOR ASSEMBLY

Next: End

CH DOES NOT RESPOND 3

Next: End

CH DOES NOT RESPOND 2

Next: End

BLOCKED

PIPE ASSEMBLY - EXPANSION VESSEL

Next: End

FAILED COMBUSTION TEST

ERROR CODES

Next: End

IGNITES BUT DOES NOT ESTABLISH

COMBUSTION CONTROL UNIT

Next: End

IGNITES BUT DOES NOT ESTABLISH

BURNER ASSEMBLY

Next: End

NOT ESTABLISHING

IGNITION ELECTRODE ASSEMBLY (GAP TO BURNER)

Next: End

POOR HW RADS REMAIN COOL

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

POOR HW RADS REMAIN COLD

HEAT EXCHANGER ASSEMBLY

Next: End

DOES NOT RESPOND TO CH DEMAND

COMBUSTION CONTROL UNIT

Next: End

DOES NOT RESPOND TO CH DEMAND 1

COMBUSTION CONTROL UNIT

Next: End

CH DOES NOT RESPOND 5

Next: End

CH DOES NOT RESPOND 6

Next: End

FAILED GAS RATE POOR HW

COMBUSTION CONTROL UNIT

Next: End

POOR HOT WATER RADS COOL

COMBUSTION CONTROL UNIT

Next: End

FUSE INVESTIGATION

PWM PUMP WIRING

Next: End

FUSE INVESTIGATION

HARNESS - WIRING - PUMP

Next: End

BOILER NOISY/BAFFLES

COMBUSTION CONTROL UNIT

Next: End

RETEST APPLIANCE ERROR CODE RESET

ERROR CODE RESET

Next: End

BOILER UPTO TEMP RADS COLD

Next: End

BOILER UP TO TEMP RADS COLD

3 WAY VALVE MOTOR HEAD

Next: End

RADS HEATING WITH NO DEMAND

CARTRIDGE 3 WAY VALVE

Next: End

TEMP FAULT CODES 2

WIRING - SENSORS

Next: End

OUT OF CALIBRATION 1

SENSOR (RETURN)

Next: End

BLOCKED

PRESSURE GAUGE

Next: End

FLUE SENSOR ERROR CODES

ERROR CODE RESET

Next: End

RETURN SENSOR ERROR CODES

ERROR CODE RESET

Next: End

FLOW SENSOR ERROR CODES

ERROR CODE RESET

Next: End

E01 20

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 20

NTC SENSOR (FLUE)

Next: End

ERROR E01 20

WIRING - SENSORS

Next: End

ERROR CODE E01 20

SENSOR (RETURN)

Next: End

ERROR CODE E01 20

PRESSURE GAUGE

Next: End

ERROR CODE E01 20

PUMP

Next: End

ERROR CODE E01 20

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 20

HEAT EXCHANGER FLUEWAYS

Next: End

E01 20

NTC SENSOR (FLUE)

Next: End

LOW PRESSURE FAULT CODES

PRESSURE GAUGE

Next: End

LOW PRESSURE FAULT CODES

ERROR CODE RESET

Next: End

LOW PRESSURE FAULT CODES

WIRING - SENSORS

Next: End

LOW PRESSURE FAULT CODES

PRESSURE SWITCH

Next: End

LOW PRESSURE FAULT CODES

HYDRAULIC BLOCK - LEFT SECTION

Next: End

LOW WATER PRESSURE FAULT CODES 1

PRESSURE SWITCH

Next: End

LOW WATER FAULT CODES

CARTRIDGE - BYPASS

Next: End

FLUE SENSOR ERROR CODES

NTC SENSOR (FLUE)

Next: End

RETURN SENSOR ERROR CODES

SENSOR (RETURN)

Next: End

FLOW SENSOR ERROR CODES

WIRING - SENSORS

Next: End

ERROR CODE E04 12 FALSE FLAME SIGNAL

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E04 08

PRESSURE GAUGE

Next: End

E04 08

WIRING - SENSORS

Next: End

ERROR CODE E04 08

SENSOR (RETURN)

Next: End

E04 08

PUMP

Next: End

ERROR CODE E08 04

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

ERROR CODE E08 04

Next: End

NORMAL OPERATION

OVERHEAT

Next: End

ERROR CODE E04 08 CONTINUES TO HEAT

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E08 04 OVERHEATS EARLY

LIMIT THERMOSTAT

Next: End

ERROR CODE E04 08

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E04 08

WIRING - SENSORS

Next: End

ERROR CODE E01 02

PRESSURE GAUGE

Next: End

ERROR CODE E01 02

PUMP

Next: End

ERROR CODE E01 02

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

ERROR E01 02

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 02

Next: End

ERROR CODE E01 02

WIRING - SENSORS

Next: End

FAULT CODE E01 02

COMBUSTION CONTROL UNIT

Next: End

ERROR CODE E01 02

SENSOR (RETURN)

Next: End

ERROR CODE E01 11

COMBUSTION CONTROL UNIT

Next: End

FAULT CODES E02 19 20 21

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 10

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 12

CONNECTION BOARD - WIRING

Next: End

NO CH 4

CONNECTION BOARD - WIRING

Next: End

NO CH 5

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 13

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 5

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 11

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 3

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 1

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 4

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 8

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 2

CONNECTION BOARD - WIRING

Next: End

PUMP RUNS CONTINOUSLY

FROST PROTECTION

Next: End

PUMP RUNS CONTINUOUS

COMBUSTION CONTROL UNIT

Next: End

ERROR CODES

ERROR CODES

Next: End

NORMAL OPERATION

FROST PROTECTION

Next: End

ON WITH NO DEMAND

Next: End

BOILER FIRES WITH NO DEMAND

Next: End

BOILER FIRES WITH NO DEMAND

INTERNAL PROGRAMMER / TIMER

Next: End

FIRING WITH NO DEMAND

COMBUSTION CONTROL UNIT

Next: End

CH DOES NOT RESPOND 4

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH 8

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 3

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH 7

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 5

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH 2

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 6

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH 3

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND 1

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH

CONNECTION BOARD - WIRING

Next: End

CH DOES NOT RESPOND

INTERNAL PROGRAMMER / TIMER

Next: End

NO CH 6

CONNECTION BOARD - WIRING

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION MAINS

ERROR CODES

Next: End

BLANK DISPLAY

CABLE - POWER SUPPLY - PCB/TIMER

Next: End

NO POWER TO DISPLAY PCB

COMBUSTION CONTROL UNIT

Next: End

FURTHER INVESTIGATION FUSE F1

ERROR CODES

Next: End

FAN DOES NOT RUN NO DISPLAY

COMBUSTION CONTROL UNIT

Next: End

PUMP RUNS CONTINOUSLY NO DISPLAY

FROST PROTECTION

Next: End

PUMP RUNS CONTINUOUS NO DISPLAY

COMBUSTION CONTROL UNIT

Next: End

NORMAL OPERATION NO DISPLAY

FROST PROTECTION

Next: End

ON WITH NO DEMAND NO DISPLAY

Next: End

BOILER FIRES WITH NO DEMAND NO DISPLAY

Next: End

BOILER FIRES WITH NO DEMAND NO DISPLAY

INTERNAL PROGRAMMER / TIMER

Next: End

DOES NOT RUN NO DISPLAY

PUMP

Next: End

BLANK DISPLAY FURTHER INVESTIGATION

PCB - HMI CONTROL - FURTHER INVESTIGATION

Next: End

POOR FLOW RATE NO DISPLAY

DHW PLATE HEAT EXCHANGER ASSEMBLY

Next: End

NOT RECOGNISING DEMAND BLANK DISPLAY

COMBUSTION CONTROL UNIT

Next: End

FAN DOES NOT RUN NO DISPLAY

HALL SENSOR ASSEMBLY

Next: End

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1285

TEMPERATURE RISE UNSATISFACTORY, RADIATORS REMAINS COOL

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1287

TEMPERATURE RISE UNSATISFACTORY, RADIATORS HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1289

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1291

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: !p2419

APPLIANCE DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: p2658

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p1503

PUMP SPEED CONTROL RESISTANCES NOT AS ABOVE

CHARACTERISTIC TEST FROM RESISTANCE PUMP AND HARNESS - FUSE INVESTIGATION

Next: p2206

PUMP MAINS SUPPLY RESISTANCES NOT AS ABOVE

CHARACTERISTIC TEST FROM RESISTANCE PUMP AND HARNESS - FUSE INVESTIGATION

Next: p2208

FAN PRESSURE DOES NOT REACH 2.5 - 3MB OR PRESSURE IS NEGATIVE

CHARACTERISTIC TEST FROM PRESSURE FAN DURING IGNITION PHASE

Next: p2565

FAN PRESSURE EXCEEDS 2.5 - 3MB (E G 4MB)

CHARACTERISTIC TEST FROM PRESSURE FAN DURING IGNITION PHASE

Next: p2567

FAN PRESSURE REACHES 2.5 - 3MB BUT DOES NOT CHANGE TO 0MB

CHARACTERISTIC TEST FROM PRESSURE FAN DURING IGNITION PHASE

Next: !p2569

3VDC PRESENT ON TEST 1 BUT DOES NOT DROP TO 0 VDC

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: p2692

VOLTAGE ABSENT ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: !p2691

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p1668

BURNER IGNITES BUT BAFFLES OUT AND/OR NOISY

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p277

3VDC PRESENT ON TEST 1 BUT DOES NOT DROP TO 0VDC

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: p2833

VOLTAGE ABSENT ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: !p2832

BURNER RESTRICTED / BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP TO BURNER

Next: !p3039

SPARK GAP TO BURNER INCORRECT

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP TO BURNER

Next: !p3041

APPLIANCE DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: p3049

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: !p3051

3VDC PRESENT ON TEST 1 BUT DOES NOT DROP TO 0VDC

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: p3054

VOLTAGE ABSENT ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CH DEMAND AT MAIN PCB

Next: !p3056

HYDRAULIC MANIFOLD BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SWITCH AND HYDRAULIC MANIFOLD

Next: !p4357

PRESSURE SWITCH BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SWITCH AND HYDRAULIC MANIFOLD

Next: !p4359

BYPASS BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SWITCH AND HYDRAULIC MANIFOLD

Next: !p4361

APPLIANCE CONTINUES TO HEAT BEYOND 85°C

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p4415

APPLIANCE OVERHEATS BEFORE 85°C IS REACHED

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p4417

DISPLAY BLANK

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4829

APPLIANCE FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4659

ERROR CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4661

PUMP RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4663

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: p4914

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION - NO DISPLAY

Next: !p4916

APPLIANCE FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4918

PUMP RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER INITIALISATION

Next: p4920

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2437

BOILER UP TO TEMPERATURE, RADIATORS DO NOT HEAT SUFFICIENTLY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1599

SYSTEM PRESSURE RISE IS EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2976

24/10/2017 10:32:22 1710_1_50_1 10/11/2017 11:33:36

30/10/2017 09:57:56

Next: End

INSPECTION DHW ISOLATION VALVE

Next: p1275, !f1276

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p1302, ?1303, ?1305

VOLTAGE DEMAND FROM HALL SENSOR

{GAINPCBACS}
ENSURE NO DEMANDS

Next: !p2864, f2865

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p1510, !f1511

VOLTAGE TO DIVERTER VALVE (DHW DEMAND)

{GAINPCBACS}

Next: p1533, !f1534

INSPECTION DIVERTER VALVE - FUSE INVESTIGATION

REMOVE ELECTRICAL CO

Next: p2197, !f2198

RESISTANCE DIVERTER VALVE MOTOR - FUSE INVESTIGATION

REMOVE ELECTRICAL CONNECTOR FROM THE DIVERTER MOTOR

Next: !p2201, !f2202

OBSERVATION RESET BUTTON

Next: !p2310, !f2311

VOLTAGE TO DISPLAY PCB

{GAINPCBACS}

Next: p2317, !f2318

OBSERVATION RESET APPLIANCE - ENSURE APPLIANCE IS COOL

ENSURE APPLIANCE IS COOL

Next: p2398, f2399

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p2400, f2401

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p2404, !f2405

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p2406, !f2407

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p2425, !f2426

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p2435, !f2436

INSPECTION HEATING FILTER

BOILER DRAINED AND DISCHARGED

Next: !p2433, !f2434

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4604, f4611

VOLTAGE CH DEMAND AT MAIN PCB

{GAINPCBACS}
ENSURE NO DEMANDS

Next: !p2828, ?2829, ?2831

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4565, f4579

VOLTAGE TO HALL SENSOR

Next: p2866, !f2867

BYPASS EXTERNAL CONTROLS - 24V

DISCONNECT 24V EXTER

Next: !p2920, f2921

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4597, f4620

BYPASS EXTERNAL CONTROLS - 24V

DISCONNECT 24V EXTER

Next: !p2946, f2947

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4572, f4588

AIR INLET TEST

REMOVE AIR INLET TEST POINT

Next: p2983, !f3815

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3047, ?3048, ?3050

BYPASS EXTERNAL CONTROLS - 24V

DISCONNECT 24V EXTER

Next: !p3059, f3060

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p3061, f3530

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p3071, f4496

INSPECTION CONDENSATE PIPE

Next: p3081, !f3082

OBSERVATION RESET APPLIANCE - ERROR CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p3504, !f3505

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: p4486, f4489

VOLTAGE TO DIVERTER VALVE (CH DEMAND)

{GAINPCBACS}

Next: p3600, !f3601

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p3666, !f3667

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p3669, !f3670

INSPECTION HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE PRESSURE GAUGE FROM MANIFOLD

Next: !p3672, !f3673

RESISTANCE FLUE SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p3884, f4362

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p3893, f4365

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p3902, f4368

OBSERVATION SYSTEM PRESSURE

Next: p4332, !f4348

OBSERVATION RESET APPLIANCE - ENSURE APPLIANCE IS COOL

ENSURE APPLIANCE IS COOL

Next: p4033, f4034

RESISTANCE FLUE SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p4035, f4036

RESISTANCE FLUE SENSOR HARNESS

REMOVE CONNECTOR X5 FROM THE MAIN PCB
REMOVE CONNECTOR FROM THE FLUE SENSOR

Next: !p4037, !f4038

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p4041, !f4042

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p4045, !f4046

INSPECTION HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE PRESSURE GAUGE FROM MANIFOLD

Next: !p4053, !f4054

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p4057, !f4058

INSPECTION CONDENSATE PIPE

Next: p4065, !f4066

RESISTANCE FLUE SENSOR HARNESS

REMOVE CONNECTOR X5 FROM THE MAIN PCB
REMOVE CONNECTOR FROM THE FLUE SENSOR

Next: !p4097, !f4098

VOLTAGE POLARITY

GAIN ACCESS TO THE MAINS CONNECTOR ON THE CONNECTION PCB

Next: p4320, !f4321

INSPECTION HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE PRESSURE GAUGE FROM MANIFOLD

Next: !p4335, !f4336

RESISTANCE PRESSURE SWITCH

REMOVE THE LEADS FROM THE PRESSURE SWITCH

Next: !p4353, f4354

INSPECTION PRESSURE SWITCH AND HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER

Next: !p4355, ?4356, ?4358, ?4360

RESISTANCE FLUE SENSOR HARNESS

REMOVE CONNECTOR X5 FROM THE MAIN PCB
REMOVE CONNECTOR FROM THE FLUE SENSOR

Next: !p4363, !f4364

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p4366, !f4367

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p4369, !f4370

OBSERVATION RESET APPLIANCE - ENSURE APPLIANCE IS COOL

ENSURE APPLIANCE IS COOL

Next: p4377, f4418

INSPECTION HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE PRESSURE GAUGE FROM MANIFOLD

Next: !p4382, !f4383

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p4388, !f4389

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p4392, !f4393

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p4396, !f4397

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p4406, !f4407

INSPECTION HEATING FILTER

BOILER DRAINED AND DISCHARGED

Next: !p4410, !f4411

RESISTANCE LIMIT THERMOSTAT AND HARNESS

REMOVE CONNECTOR X5 FROM THE MAIN PCB

Next: !p4422, f4423

RESISTANCE LIMIT THERMOSTAT

REMOVE THE LEADS FROM THE LIMIT THERMOSTAT

Next: !p4424, !f4425

OBSERVATION RESET APPLIANCE - ENSURE APPLIANCE IS COOL

ENSURE APPLIANCE IS COOL

Next: p4427, f4458

INSPECTION HYDRAULIC MANIFOLD

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE PRESSURE GAUGE FROM MANIFOLD

Next: !p4432, !f4433

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p4442, !f4443

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p4452, !f4453

INSPECTION HEATING FILTER

BOILER DRAINED AND DISCHARGED

Next: !p4456, !f4457

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4459, f4460

RESISTANCE FLOW SENSOR

REMOVE CONNECTOR FROM THE FLOW SENSOR (RED WIRES)

Next: !p4461, !f4462

RESISTANCE RETURN SENSOR HARNESS

REMOVE CONNECTOR X5

Next: !p4470, !f4471

INSPECTION CONDENSATE PIPE

Next: p4473, !f4474

INSPECTION JUMPER POSITIONS

GAIN ACCESS TO THE CONNECTION PCB

Next: !p4484, !f4485

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4490, !f4491

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: p4497, f4498

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4499, !f4500

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: !p4580, f4581

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4582, !f4583

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: !p4589, f4590

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4591, !f4592

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: !p4612, f4613

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4614, !f4615

RESISTANCE INTERNAL TIMER BYPASS LINK AT X3

SLIDE CONNECTION PCB OUT AND REMOVE CONNECTOR X3

Next: !p4621, f4622

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL FROM LEFT SIDE OF APPLIANCE

Next: p4623, !f4624

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4666, !f4667

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4674, !f4675

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4680, f4681

DISCONNECT EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4682, !f4683

DISCONNECT INTERNAL TIMER - SELF TEST

SLIDE THE CONNECTION

Next: !p4686, !f4687

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4782, !f4783

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4789, !f4790

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4796, !f4797

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4803, !f4804

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4810, !f4811

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4817, !f4818

RESISTANCE MAINS SUPPLY FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p4832, f4833

FUSE FURTHER INVESTIGATION - MAINS

Next: !p4834, !f4835

VOLTAGE MAINS POWER AT CONNECTION PCB

{GAINPCBACS}
SLID

Next: !p4838, !f4839

RESISTANCE FUSE F1

REMOVE THE FUSE FROM THE PCB

Next: !p4842, f4843

FUSE FURTHER INVESTIGATION F1

Next: !p4844, !f4845

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4923, !f4924

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4929, !f4930

DISCONNECT EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4937, !f4938

DISCONNECT INTERNAL TIMER - SELF TEST

SLIDE THE CONNECTION

Next: !p4941, !f4942

OBSERVATION DHW FLOW RATE

Next: p4949, f4950

INSPECTION DHW ISOLATION VALVE

Next: p4951, !f4952

VOLTAGE TO HALL SENSOR

Next: p4959, !f4960

OBSERVATION COLD WATER SUPPLY

Next: p1277, !f1278

INSPECTION DHW CARTRIDGE

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE
DRAIN THE HOT WATER CIRCUIT

Next: !p1279, !f1280

OBSERVATION SYSTEM PRESSURE

Next: p1292, !f1293

OBSERVATION SYSTEM PRESSURE

Next: p1539, !f1540

OBSERVATION DIVERTER VALVE HEAD OPERATION - DHW

REMOVE THE LOCKING P

Next: !p3605, f1532

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p1529, !f1530

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p1294, !f1295

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p1296, !f1297

PUMP TEST

Next: p1298, !f1299

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p1300, f1301

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS PRESSURE INLET TEST POINT

Next: p2590, !f2604

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p1527, !f1528

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1594, !f1595

RESISTANCE HARNESS DIVERTER

REMOVE CONNECTOR X3 FROM THE MAIN PCB
DISCONNECT THE HARNESS FROM THE DIVERTER MOTOR HEAD

Next: !p1535, !f1536

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p1541, !f1542

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p3042, !f3093

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p1606, !f1613

OBSERVATION DIVERTER VALVE HEAD OPERATION - CH

REMOVE THE LOCKING P

Next: p3592, f3599

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p1662, !f1663

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1664, !f1665

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS PRESSURE INLET TEST POINT

Next: p271, !f1762

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE AND THE PCB

Next: p1867, !f1868

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p2607, !f2614

PRESSURE FAN DURING IGNITION PHASE

ATTACH THE TUBE TO L

Next: p2967, ?2564, ?2566, ?2568

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p2572, !f2573

INSPECTION COMBUSTION CIRCUIT SEALS

Next: p2144, !f2145

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p2146, !f2147

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: p2148, !f2149

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3330, !f3331

RESISTANCE DIVERTER MOTOR AND HARNESS - FUSE INVESTIGATION

REMOVE CONNECTOR X3 FROM THE PCB

Next: p2199, f2200

RESISTANCE PUMP AND HARNESS - FUSE INVESTIGATION

REMOVE CONNECTOR X2

Next: p2241, ?2205, ?2207

RESISTANCE PUMP (SPEED CONTROL)

DISCONNECT PUMP SPEED CONTROL ELECTRICAL PLUG FROM THE PUMP (RIGHT SIDE)

Next: !p3104, !f3105

RESISTANCE PUMP (MAINS SUPPLY)

DISCONNECT MAINS SUPPLY ELECTRICAL PLUG FROM THE PUMP (LEFT SIDE)

Next: !p3106, !f3107

RESISTANCE FAN - FUSE INVESTIGATION

GAIN ACCESS TO MAIN

Next: p2242, !f2243

RESISTANCE GAS VALVE - FUSE INVESTIGATION

DISCONNECT THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p2244, !f2245

RESISTANCE HARNESS DISPLAY PCB

DISCONNECT THE HARNESS FROM THE DISPLAY PCB

Next: !p2319, !f2320

OBSERVATION SYSTEM PRESSURE

Next: p2408, !f2409

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p2402, f2403

OBSERVATION DOES SYSTEM PRESSURE INCREASE

Next: p3617, f3671

OBSERVATION SENSORS CORRECTLY FITTED

Next: p2412, !f2413

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p2414, !f2415

OBSERVATION PUMP RUNS

Next: p2420, f2424

PUMP TEST

Next: p2444, !f2423

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p2429, f2430

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p2427, !f2428

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p2431, f2432

INSPECTION JUMPER POSITIONS

GAIN ACCESS TO THE CONNECTION PCB

Next: p1661, !f2443

OBSERVATION PUMP OVERRUN

Next: p2422, !f2454

INSPECTION CONDENSATE PIPE

Next: p2576, !f2577

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: !p2584, !f2585

INSPECTION SPARK GAP TO BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: !p2574, !f2575

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: p2578, !f2579

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p2580, !f2581

INSPECTION FLUE

Next: !p2582, !f2583

INSPECTION CONDENSATE PIPE

Next: p1865, !f2605

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p2608, !f2609

INSPECTION BURNER AND SPARK GAP TO BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: !p3037, ?3038, ?3040

VOLTAGE CH DEMAND AT MAIN PCB

{GAINPCBACS}
ENSURE NO DEMANDS

Next: !p2687, ?2688, ?2690

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

GAIN ACCESS TO THE CONNECTION PCB

Next: p2693, f2919

BYPASS EXTERNAL CONTROLS - 240V

DISCONNECT 240V EXTE

Next: !p2710, f2711

OBSERVATION IS SPARKING PRESENT

REMOVE IGNITION LEAD FROM SPARK GENERATOR AND MAKE SAFE

Next: p1988, !f2975

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS PRESSURE INLET TEST POINT

Next: p3013, !f3029

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

GAIN ACCESS TO THE CONNECTION PCB

Next: p2834, f2945

BYPASS EXTERNAL CONTROLS - 240V

DISCONNECT 240V EXTE

Next: !p2851, f2852

RESISTANCE HALL SENSOR HARNESS

UNCLIP THE HALL SENSOR FROM BELOW THE TURBINE THEN
REMOVE THE CONNECTOR FROM THE HALL SENSOR

Next: p2868, !f2869

INSPECTION FLOW TURBINE

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE
DRAIN THE HOT WATER CIRCUIT

Next: !p2870, !f2871

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE AND THE PCB

Next: p2001, !f2973

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p2977, !f2978

INSPECTION CONDENSATE PIPE

Next: p2984, !f2985

INSPECTION COMBUSTION CIRCUIT SEALS

Next: p2986, !f2987

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p2988, !f2989

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: p2990, !f2991

INSPECTION FAN BEARING PLATE

Next: p2992, !f2993

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p3006, !f3011

OBSERVATION CAN COMBUSTION VALUES BE ADJUSTED

CONNECT FGA TO THE COMBUSTION TEST POINT

Next: p3007, !f3008

COMBUSTION VALUES CORRECTLY ADJUSTED

THE COMBUSTION READI

Next: !p3009, !f3010

AIR INLET TEST

REMOVE AIR INLET TEST POINT

Next: p340, !f3813

PUMP TEST

Next: p3043, !f3044

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3045, f3046

GAS RATE

Next: p3079, f3080

VOLTAGE CH DEMAND AT MAIN PCB

{GAINPCBACS}
ENSURE NO DEMANDS

Next: !p3052, ?3053, ?3055

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

GAIN ACCESS TO THE CONNECTION PCB

Next: p3057, f3058

BYPASS EXTERNAL CONTROLS - 240V

DISCONNECT 240V EXTE

Next: !p3069, f3070

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4801, f4802

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4794, f4795

TEMPERATURE COMPARISON OF HOT WATER - EXTERNAL MIXING TEST

Next: !p3091, !f3092

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p3083, !f3084

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: p3085, !f3086

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p3087, !f3088

INSPECTION FLUE

Next: !p3089, !f3090

INSPECTION CONDENSATE PIPE

Next: p2143, !f2158

PUMP TEST

Next: p3593, !f3594

INSPECTION BYPASS OPERATION

APPLIANCE DRAINED AND DISCHARGED

Next: p3595, !f3596

INSPECTION HEATING FILTER

BOILER DRAINED AND DISCHARGED

Next: !p3597, !f3598

RESISTANCE HARNESS DIVERTER

REMOVE CONNECTOR X3 FROM THE MAIN PCB
DISCONNECT THE HARNESS FROM THE DIVERTER MOTOR HEAD

Next: !p3602, !f3603

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p3641, f3665

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p2410, f3668

OBSERVATION RESET APPLIANCE - ERROR CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p3885, !f3886

OBSERVATION RESET APPLIANCE - ERROR CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p3894, !f3895

OBSERVATION RESET APPLIANCE - ERROR CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p3903, !f3904

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4039, f4040

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4043, f4044

OBSERVATION SENSORS CORRECTLY FITTED

Next: p4071, !f4095

OBSERVATION SYSTEM PRESSURE

Next: p4049, !f4050

OBSERVATION DOES SYSTEM PRESSURE INCREASE

Next: p4051, f4052

OBSERVATION PUMP RUNS

Next: p4055, f4056

PUMP TEST

Next: p4061, !f4062

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p4059, !f4060

TEMPERATURE FLUE GAS

PLACE TEMPERATURE PROBE IN THE FLUE SAMPLE TEST POINT

Next: !p4063, f4064

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p4067, !f4068

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: !p4069, !f4070

RESISTANCE FLUE SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4047, f4096

OBSERVATION BURNER EXTINGUISH

Next: p4322, !f4323

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p4373, !f4374

OBSERVATION DOES SYSTEM PRESSURE INCREASE

Next: p4333, f4334

RESISTANCE PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR X5 FROM THE MAIN PCB

Next: p4349, f4352

OBSERVATION RESET APPLIANCE - ERROR CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4350, !f4351

OBSERVATION SYSTEM PRESSURE

Next: p4378, !f4379

OBSERVATION DOES SYSTEM PRESSURE INCREASE

Next: p4380, f4381

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p4384, !f4385

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4386, f4387

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4390, f4391

OBSERVATION PUMP RUNS

Next: p4394, f4395

PUMP TEST

Next: p4400, !f4401

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p4398, !f4399

OBSERVATION PUMP OVERRUN

Next: p4402, !f4403

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p4404, f4405

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p4408, f4409

OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE AS INDICATED BY THE RED ARROW

Next: !p4412, ?4414, ?4416

OBSERVATION SYSTEM PRESSURE

Next: p4428, !f4429

OBSERVATION DOES SYSTEM PRESSURE INCREASE

Next: p4430, f4431

OBSERVATION SENSORS CORRECTLY FITTED

Next: p4434, !f4435

INSPECTION PIPEWORK CONFIGURATION

Next: p4436, !f4437

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p4438, !f4439

OBSERVATION PUMP RUNS

Next: p4440, f4441

PUMP TEST

Next: p4446, !f4447

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p4444, !f4445

OBSERVATION PUMP OVERRUN

Next: p4448, !f4449

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p4450, f4451

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p4454, f4455

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p4468, f4469

INSPECTION SILENCER

REMOVE THE BURNER DO

Next: p4475, !f4476

INSPECTION BURNER

REMOVE THE BURNER DOOR ASSEMBLY C/W FAN AND GAS VALVE ASSEMBLY

Next: p4477, !f4478

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p4479, !f4480

INSPECTION FLUE

Next: !p4481, !f4482

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4487, !f4507

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4492, !f4493

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4494, !f4495

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4505, !f4508

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4501, !f4502

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4503, !f4504

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4808, f4809

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4815, f4816

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4584, !f4585

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4586, !f4587

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4593, !f4594

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4595, !f4596

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4787, f4788

BYPASS INTERNAL PROGRAMMER / TIMER

REMOVE THE INTERNAL

Next: !p4780, f4781

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4616, !f4617

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4618, !f4619

RESISTANCE HARNESS X3

SLIDE CONNECTION PCB

Next: p4625, !f4626

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4627, !f4628

TEMPERATURE FLOW - FROST PROTECTION

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE, AS CLOSE TO THE FLOW THERMISTOR AS POSSIBLE.

Next: !p4672, f4673

ERROR CODES

Next: !p4670, !f4671

TEMPERATURE FLOW

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE, AS CLOSE TO THE FLOW THERMISTOR AS POSSIBLE.

Next: !p4664, f4665

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p4668, !f4669

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4676, !f4677

OBSERVATION WHICH DEMAND IS FLASHING

ENSURE NO DEMANDS

Next: p4678, f4679

OBSERVATION ISOLATE COLD MAINS SUPPLY

ISOLATE THE COLD MAINS SUPPLY

Next: !p4688, !f4689

DISCONNECT EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4684, f4685

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4784, !f4785

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4791, !f4792

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4798, !f4799

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4805, !f4806

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4812, !f4813

RESISTANCE HARNESS X11 / X6

REMOVE CONNECTOR X6 FROM THE MAIN PCB
REMOVE CONNECTOR X11 FROM THE CONNECTION PCB

Next: !p4819, !f4820

VOLTAGE MAINS POWER INPUT TO APPLIANCE

GAIN ACCESS TO THE MAINS CONNECTOR ON THE CONNECTION PCB

Next: p4830, f4831

VOLTAGE MAINS POWER AT MAIN PCB

{GAINPCBACS}

Next: p4836, f4837

VOLTAGE TO DISPLAY PCB

{GAINPCBACS}

Next: p4840, f4841

RESISTANCE HARNESS DISPLAY PCB

DISCONNECT THE HARNESS FROM THE DISPLAY PCB

Next: p4850, !f4908

INFORMATION BLANK DISPLAY

THE TESTS CARRIED OU

Next: p4911, !f4965

OBSERVATION BOILER INITIALISATION - NO DISPLAY

ENSURE NO DEMANDS ARE PRESENT

Next: p4912, ?4913, ?4915, ?4917, ?4919

OBSERVATION PUMP RUNS

Next: !p4947, f4948

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p4943, !f4944

TEMPERATURE FLOW - FROST PROTECTION

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE, AS CLOSE TO THE FLOW THERMISTOR AS POSSIBLE.

Next: !p4927, f4928

TEMPERATURE FLOW

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE, AS CLOSE TO THE FLOW THERMISTOR AS POSSIBLE.

Next: !p4921, f4922

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p4925, !f4926

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X5 FROM THE PCB

Next: p4931, !f4932

OBSERVATION ISOLATE COLD MAINS SUPPLY

ISOLATE THE COLD MAINS SUPPLY

Next: p4933, !f4934

OBSERVATION DOES THE BOILER HAVE AN INTERNAL PROGRAMMER / TIMER FITTED

Next: p4935, f4936

DISCONNECT EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4939, f4940

RESISTANCE PUMP MAINS SUPPLY HARNESS

REMOVE CONNECTOR X2

Next: !p4945, !f4946

VOLTAGE DEMAND FROM HALL SENSOR

{GAINPCBACS}
ENSURE NO DEMANDS

Next: !p4957, f4958

OBSERVATION COLD WATER SUPPLY

Next: p4953, !f4954

INSPECTION DHW CARTRIDGE

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE
DRAIN THE HOT WATER CIRCUIT

Next: !p4955, !f4956

RESISTANCE HALL SENSOR HARNESS

UNCLIP THE HALL SENSOR FROM BELOW THE TURBINE THEN
REMOVE THE CONNECTOR FROM THE HALL SENSOR

Next: p4961, !f4962

INSPECTION FLOW TURBINE

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE
DRAIN THE HOT WATER CIRCUIT

Next: !p4963, !f4964

System Information

Total Tests: 754

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control