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:

4726743 FERROLI OPTIMAX HE 38C HONEYWELL PCB

WARNING - IMPORTA

Next: &1, *

NO FAULT FOUND

Next: nff

4726743 FERROLI OPTIMAX HE 38 C HONEYWELL PCB

STEP 1:
RE

Next: &2, !f46

OBSERVATION DISPLAY OPERATION

Next: &3, ?12, ?14

OBSERVATION FAN PURGE AND PUMP PULSE

ENSURE NO DEMANDS
ENSURE APPLIANCE IS COOL
ECO MODE ON (ECO ON DISPLAY)

Next: &717, ?499, ?509, ?515, ?521, ?2453

OBSERVATION DHW DEMAND RECOGNISED

ECO MODE ON (ECO ON DISPLAY)

Next: &6, f102

OBSERVATION FAN RUNS WITH DHW DEMAND

Next: &7, f135

OBSERVATION BURNER IGNITION AND ESTABLISH

ECO MODE ON (ECO IN DISPLAY)

Next: &8, ?66, ?68, ?70, ?220, ?540

OPERATION DHW

DHW SET TO MAXIMUM TEMPERATURE (65°C)

Next: &2384, ?72, ?74, ?76, ?78

OPERATION CH

CH THERMOSTAT SET TO MAX

Next: &445, ?83, ?85

OBSERVATION FAN AND PUMP OVERRUN

Next: &nff, !f2452

OBSERVATION CH DEMAND RECOGNISED

BOILER CH THERMOSTAT

Next: &9, f311

OBSERVATION SYSTEM PRESSURE RISE

BOILER CH THERMOSTAT TO MAX

Next: &547, f131

OBSERVATION DHW MODULATION

RUN THE HOT WATER TAP WITH A FLOW RATE OF APPROXIMATELY 7 L/MIN

Next: &82, f1991

OBSERVATION CH MODULATION

Next: &89, f1998

FAULT CODES (A FAULT CODES)

Next: &nff, !f453

FUNCTIONAL SEQUENCE

Next: &nff, !f469

FAN INVESTIGATION F15,A05

INTENTIONALLY BLANK HEADER FOR F15 AND A05

Next: &nff, f471

OPERATION PRE HEAT

ENSURE BOILER IS COO

Next: &10, !f548

WIRELESS CONTROLS INVESTIGATION

Next: &nff, f558

NO DISPLAY (CONTINUE DIAGNOSIS)

INTENTIONALLY BLANK HEADER FOR INVESTIGATION WITH NO DISPLAY

Next: &nff, f2295

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &2054, !f718

RETURN THERMISTOR INVESTIGATION F11

INTENTIONALLY BLANK HEADER FOR F11

Next: &nff, f725

FLOW / STAT THERMISTOR INVESTIGATION F10 AND F14

Next: &nff, f732

PARAMETERS F50,F12

Next: &nff, !f738

PRESSURE SENSOR INVESTIGATION PRESSURE TOO HIGH

INTENTIONALLY BLANK HEADER FOR PRESSURE TOO HIGH

Next: &nff, f750

REPEAT OVERPRESSURE INVESTIGATION A26

INTENTIONALLY BLANK HEADER FOR A26 FAULT CODE

Next: &nff, f760

FLUE THERMISTOR INVESTIGATION F13

Next: &nff, f775

PCB

Next: &nff, !f783

POWER SUPPLY VOLTAGE F34

INTENTIONALLY BLANK HEADER FOR F34

Next: &nff, f785

POWER SUPPLY FREQUENCY F35

INTENTIONALLY BLANK HEADER FOR F35

Next: &nff, !f2053

FLAME DETECTED AFTER BURNER SHUTDOWN A02

INTENTIONALLY BLANK HEADER FOR A02 FAULT CODE

Next: &nff, f791

CONDENSE LEVEL TOO HIGH F36, A25

INTENTIONALLY BLANK HEADER FOR F36 AND A25

Next: &nff, f795

GAS VALVE A62

INTENTIONALLY BLANK HEADER FOR A62 FAULT CODE

Next: &nff, f809

OUTSIDE TEMPERATURE ERROR F39

INTENTIONALLY BLANK HEADER FOR F39 FAULT CODE

Next: &nff, f815

WIRING OR WATER INGRESS F17

Next: &nff, !f839

BURNER SHUTDOWN A06

INTENTIONALLY BLANK HEADER FOR A06

Next: &nff, f1729

FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER FOR FUSE INVESTIGATION

Next: &nff, f850

OVERHEAT INVESTIGATION

INTENTIONALLY BLANK HEADER FOR OVERHEAT INVESTIGATION

Next: &nff, f1770

FLUE OVERHEAT INVESTIGATION

Next: &nff, f1033

SERVICE MODE MAX AND MIN GUIDE


TO ENTER SERVICE

Next: &nff, !f1222

PARAMETERS GUIDE

1. TO ACCESS

Next: &nff, !f1223

FAULT CODE HISTORY

1. PRESS AND

Next: &nff, !f1232

FAULT CODES FOR FAULT CODE HISTORY

PLEASE CHOOSE THE AP

Next: &nff, !f1249

HEADER FOR IGNITION FAULT FROM FAULT CODES HISTORY

INTENTIONALLY BLANK HEADER FOR FAULT CODES FROM FAULT CODE HISTORY

Next: &nff, f1279

PRESSURE SENSOR INVESTIGATION PRESSURE TOO LOW

INTENTIONALLY BLANK HEADER FOR PRESSURE TOO LOW

Next: &nff, f1638

DHW FLOW RATE

Next: &5, f2055

F42 INVESTIGATION

INTENTIONALLY BLANK HEADER FOR F42

Next: &nff, f2206

FLUE GAS ANALYSIS

Next: &444, f2385

HEADER FOR FLUE GAS ANALYSIS WHEN INVESTIGATING CH FROM SEQUENCE OF OPS

INTENTIONALLY BLANK

Next: &nff, f2408

PRESSURE SENSOR DISCONNECTED F47

INTENTIONALLY BLANK HEADER FOR FAULT CODE F47

Next: &nff, f2425

INSTALLER MODE FOR TEMPERATURE

Next: &nff, !f2451

BLOCKED NOT SHOWING PRESSURE FLUE OVERHEAT

GAUGE - PRESSURE - PUSH FIT

Next: End

NOT FITTED CORRECTLY FLUE OVERHEAT

SENSOR FITMENT

Next: End

NO POWER TO TURBINE

PCB

Next: End

TURBINE

HARNESS

Next: End

NOT SPARKING

ELECTRODE IGNITION

Next: End

SHORTING TO EARTH F36 A25

LEAD IGNITION W/O PLUG

Next: End

PARTIAL RESTRICTION

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

EXPLOSIVE IGNITION

ELECTRODE IGNITION

Next: End

EXPLOSIVE IGNITION

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

EXPLOSIVE IGNITION

GAS INLET PRESSURE

Next: End

READING HOT WHEN COLD

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

READING HOT WHEN COLD

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

RUNNING SLOW OR WEAK

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

EXTERNAL CONTROLS POOR DHW

Next: End

EXTERNAL CONTROLS POOR DHW 2

Next: End

RESTRICTED WRONG TEMPERATURE DIFFERENTIAL

PRIMARY FILTER

Next: End

RESISTANCE HIGH OR POOR CONDITION 2

LEAD IGNITION W/O PLUG

Next: End

NOT SPARKING 2

ELECTRODE IGNITION

Next: End

BLANK FOR SERVICE MODE GUIDE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR PARAMETERS GUIDE

Z DIRECTION CHOICE OR CONTINUE

Next: End

SHORTING TO EARTH 2

LEAD IGNITION W/O PLUG

Next: End

BLANK FOR FAULT CODE HISTORY

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FAULT CODES FAULT CODE HISTORY

Z DIRECTION CHOICE OR CONTINUE

Next: End

LOW WHEN OTHER APPLIANCES ON

GAS INLET PRESSURE

Next: End

FLAT

EXPANSION VESSEL - 7 LITRE

Next: End

PREVENTING DEMAND

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

PREVENTING DEMAND

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

PARTIALLY RESTRICTED CAUSING POOR FLUE GAS READINGS 2

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

IGNITION PROBLEMS

LEAD IGNITION W/O PLUG

Next: End

IGNITION PROBLEMS

ELECTRODE IGNITION

Next: End

IGNITION PROBLEMS

IGNITION LEAD END DAMAGED

Next: End

IGNITION PROBLEMS 2

LEAD IGNITION W/O PLUG

Next: End

IGNITION PROBLEMS

IGNITION CAP

Next: End

IGNITION PROBLEMS 2

ELECTRODE IGNITION

Next: End

BLOCKED CAUSING IGNITION PROBLEMS

TRAP CONDENSATE OR PIPE

Next: End

IGNITION PROBLEMS

SUMP AND PIPE

Next: End

IGNITION PROBLEMS

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

HIGH RESISTANCE INTERMITTENT

GAS VALVE

Next: End

IGNITION PROBLEMS 3

TRAP CONDENSATE OR PIPE

Next: End

IGNITION PROBLEMS 3

SUMP AND PIPE

Next: End

IGNITION PROBLEMS 3

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

POOR IGNTION

PARAMETERS IGNITION FAN SPEED

Next: End

VOLTAGE TO GAS VALVE AFTER DEMAND

PCB

Next: End

CAUSING OVER PRESSURE FAULT CODE

SYSTEM PRESSURE TOO HIGH

Next: End

REPEAT OVER PRESSURE

SYSTEM PRESSURE TOO HIGH

Next: End

NO POWER TO PRESSURE SWITCH FAULT CODE (LOW)

PCB

Next: End

PRESSURE SENSOR FAULT CODE LOW PRESSURE

HARNESS

Next: End

FAULT CODE

SYSTEM PRESSURE LOW

Next: End

RESTRICTED OR BLOCKED

NOZZLE AIR GAS MIXING CHAMBER

Next: End

NOT LIGHTING

IGNITION ELECTRODE INTERNAL

Next: End

CAUSING NO IGNITION

BURNER - CERAMIC (38C)

Next: End

RESTRICTED OR BLOCKED 2

NOZZLE AIR GAS MIXING CHAMBER

Next: End

CAUSING BAFFLING - SEALS OR BLOCKED

FLUE

Next: End

DAMAGED CAUSING BAFFLING

BURNER - CERAMIC (38C)

Next: End

RESTRICTING HEAT EX CAUSING BAFFLING

INSULATION PADS

Next: End

RESTRICTED OR BLOCKED BAFFLING

HEAT EXCHANGER (38C)

Next: End

EXPLOSIVE IGNITION

NOZZLE AIR GAS MIXING CHAMBER

Next: End

EXPLOSIVE IGNITION

IGNITION ELECTRODE INTERNAL

Next: End

EXPLOSIVE IGNITION

BURNER - CERAMIC (38C)

Next: End

WEAK SPARK POOR IGNITION

PCB

Next: End

A06 FAULT CODE

GAS INLET PRESSURE

Next: End

A06 FAULT CODE

TRAP CONDENSATE OR PIPE

Next: End

A06 FAULT CODE

SUMP AND PIPE

Next: End

A06 FAULT CODE

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

A06 FAULT CODE LOCKING OUT

NOZZLE AIR GAS MIXING CHAMBER

Next: End

A06 FAULT CODE

FLUE

Next: End

A06 FAULT CODE

BURNER - CERAMIC (38C)

Next: End

A06 FAULT CODE

INSULATION PADS

Next: End

A06 FAULT CODE

HEAT EXCHANGER (38C)

Next: End

FLUE OVERHEAT

SENSOR - FLUE C/W COLLAR

Next: End

OVERHEAT FLUE OVERHEAT

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

OVERHEAT FLUE OVERHEAT

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

CAUSING OVERHEAT FLUE OVERHEAT

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

LEAKING ONTO FLUE STAT

HEAT EXCHANGER GASKETS

Next: End

FLUE OVERHEAT

FLUE

Next: End

DAMAGED FLUEWAYS CAUSING FLUE OVERHEAT

HEAT EXCHANGER (38C)

Next: End

DHW COOL RADS COOL

PRIMARY HEAT EXCHANGER AND RETURN FILTER

Next: End

BLOCKED NOT SHOWING PRESSURE

GAUGE - PRESSURE - PUSH FIT

Next: End

NOT FITTED CORRECTLY

SENSOR FITMENT

Next: End

OVERHEAT

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

OVERHEAT

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

CAUSING OVERHEAT

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

EXTERNAL CONTROLS POOR DHW OVERHEAT

Next: End

EXTERNAL CONTROLS POOR DHW 2 OVERHEAT

Next: End

SHUT CAUSING OVERHEAT

Next: End

RESTRICTED WRONG TEMPERATURE DIFFERENTIAL OVERHEAT

PRIMARY FILTER

Next: End

RESTRICTED OR BLOCKED OVERHEAT

RETURN FILTER CH

Next: End

BLOCKED

VALVE - BY-PASS C/W NRV

Next: End

RESTRICTED OR BLOCKED OVERHEAT

PLATE - HEAT EXCHANGER (38C)

Next: End

FULLY OR PARTIALLY CLOSED - OVERHEAT

ISOLATION VALVES FLOW AND RETURN

Next: End

RESTRICTED OR BLOCKED CAUING POOR FLUE GAS READINGS 2

NOZZLE AIR GAS MIXING CHAMBER

Next: End

CAUSING POOR FLUE GAS READINGS 2

FLUE

Next: End

DAMAGED CAUSING FLUE GAS FAIL 2

BURNER - CERAMIC (38C)

Next: End

RESTRICTING HEAT EX CAUSING POOR FLUE GAS READINGS 2

INSULATION PADS

Next: End

RESTRICTED OR BLOCKED IGNITION PROBLEMS

HEAT EXCHANGER (38C)

Next: End

IGNITION PROBLEMS

NOZZLE AIR GAS MIXING CHAMBER

Next: End

CAUSING IGNITION PROBLEMS

FLUE

Next: End

IGNITION PROBLEMS 2

IGNITION ELECTRODE INTERNAL

Next: End

DAMAGED CAUSING IGNITION PROBLEMS

BURNER - CERAMIC (38C)

Next: End

IGNITION PROBLEMS

INSULATION PADS

Next: End

RESTRICTED OR BLOCKED IGNTION

HEAT EXCHANGER (38C)

Next: End

WEAK SPARK FOR FAULT HISTORY

PCB

Next: End

IGNITION PROBLEMS 3

NOZZLE AIR GAS MIXING CHAMBER

Next: End

IGNITION PROBLEMS 3

FLUE

Next: End

IGNITION PROBLEMS 3

IGNITION ELECTRODE INTERNAL

Next: End

IGNITION PROBLEMS 3

BURNER - CERAMIC (38C)

Next: End

IGNITION PROBLEMS 3

INSULATION PADS

Next: End

RESTRICTED OR BLOCKED IGNITION PROBLEMS 3

HEAT EXCHANGER (38C)

Next: End

LOW

GAS INLET PRESSURE

Next: End

BLOCKED NOT SHOWING FOR FAULT CODE

GAUGE - PRESSURE - PUSH FIT

Next: End

BLOCKED NOT SHOWING PRESSURE FAULT CODE 2

GAUGE - PRESSURE - PUSH FIT

Next: End

NOT FITTED CORRECTLY DHW TOO HOT

SENSOR FITMENT

Next: End

NOT MODULATING DHW

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

NOT MODULATING DHW

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

NOT FITTED CORRECTLY DHW NOT MODULATING

SENSOR FITMENT

Next: End

NOT FITTED CORRECTLY CH NOT MODULATING

SENSOR FITMENT

Next: End

EXPLOSIVE IGNITION

INSULATION PADS

Next: End

NO POWER TO PRESSURE SWITCH REPEAT OVERPESSURE

PCB

Next: End

PRESSURE SENSOR REPEAT OVERPESSURE

HARNESS

Next: End

FLAT FAULT CODE

EXPANSION VESSEL - 7 LITRE

Next: End

NOT READING PRESSURE CORRECTLY FAULT CODE 2

GAUGE - PRESSURE - PUSH FIT

Next: End

FLAT FAULT CODE FAULT CODE

EXPANSION VESSEL - 7 LITRE

Next: End

REGISTERING FREQUENCY FAULT CODE

PCB

Next: End

DHW ISOLATION VALVE

VALVE ISOLATION - COLD WATER

Next: End

INSUFFICIENT

WATER SUPPLY

Next: End

CAUSING INTERMITTIENT LOCKOUT

PARAMETERS IGNITION FAN SPEED - FAULT HISTORY

Next: End

NOISY ON DHW

SYSTEM PRESSURE LOW

Next: End

ONLY PARTIALLY OPENING GAS VALVE

AIR IMPULSE TUBE

Next: End

ONLY PARTIALLY OPENING GAS VALVE

TRAP CONDENSATE OR PIPE

Next: End

ONLY PARTIALLY OPENING GAS VALVE

SUMP AND PIPE

Next: End

BLOCKED STOPPING IGNITION

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

PUMP OVERHEAT

HARNESS

Next: End

FAULT CODE F42

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

FULLY OR PARTIALLY CLOSED - OVERHEAT F42

ISOLATION VALVES FLOW AND RETURN

Next: End

BLOCKED NOT SHOWING PRESSURE F42

GAUGE - PRESSURE - PUSH FIT

Next: End

NOT FITTED CORRECTLY F42

SENSOR FITMENT

Next: End

OVERHEAT F42

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

PUMP OVERHEAT F42

HARNESS

Next: End

CAUSING OVERHEAT F42

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

NO SPARK

PCB

Next: End

EXTERNAL CONTROLS POOR DHW OVERHEAT F42

Next: End

EXTERNAL CONTROLS POOR DHW 2 OVERHEAT F42

Next: End

SHUT CAUSING OVERHEAT F42

Next: End

RESTRICTED WRONG TEMPERATURE DIFFERENTIAL OVERHEAT F42

PRIMARY FILTER

Next: End

RESTRICTED OR BLOCKED OVERHEAT F42

RETURN FILTER CH

Next: End

BLOCKED F42

VALVE - BY-PASS C/W NRV

Next: End

RESTRICTED OR BLOCKED OVERHEAT F42

PLATE - HEAT EXCHANGER (38C)

Next: End

CAUSING PUMP PULSE

SYSTEM PRESSURE LOW

Next: End

NO POWER TO PRESSURE SWITCH

PCB

Next: End

PRESSURE SENSOR

HARNESS

Next: End

FAN AC SECTION NO DISPLAY

HARNESS

Next: End

NO DEMAND VOLTAGE TO FAN NO DISPLAY

PCB

Next: End

FAN DC SECTION NO DISPLAY

HARNESS

Next: End

FAN DC SECTION 2 NO DISPLAY

HARNESS

Next: End

NO PEMANENT DC VOLTAGE TO FAN NO DISPLAY

PCB

Next: End

FAULTY HALL SENSOR NO DISPLAY

FAN ASSEMBLY

Next: End

CAUSING PUMP TO RUN CONTINUALLY NO DISPLAY

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

CAUSING PUMP TO RUN CONTINUALLY NO DISPLAY

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

PUMP NO DISPLAY

HARNESS

Next: End

SHORTING

HARNESS

Next: End

BLANK DISPLAY AND NO RESPONSE

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

LOW CAUSING NO RECTIFICATION

GAS INLET PRESSURE

Next: End

BLANK DISPLAY AND NO RESPONSE

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

DISPLAY BLANK AND NO RESPONSE

SENSOR - FLUE C/W COLLAR

Next: End

TIMER SECTION

HARNESS

Next: End

TIMER SECTION 2

HARNESS

Next: End

TIMER SECTION 3

HARNESS

Next: End

TIMER SECTION 4

HARNESS

Next: End

NOT RECTIFYING

RECTIFICATION LEAD

Next: End

TIMER SECTION 5

HARNESS

Next: End

INCORRECTLY SENSING DHW DEMAND

PCB

Next: End

PARTIALLY RESTRICTED CAUSING POOR FLUE GAS READINGS 3

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

RESTRICTED OR BLOCKED CAUING POOR FLUE GAS READINGS 3

NOZZLE AIR GAS MIXING CHAMBER

Next: End

CAUSING POOR FLUE GAS READINGS 3

FLUE

Next: End

DAMAGED CAUSING FLUE GAS FAIL 3

BURNER - CERAMIC (38C)

Next: End

RESTRICTING HEAT EX CAUSING POOR FLUE GAS READINGS3

INSULATION PADS

Next: End

RESTRICTED OR BLOCKED CAUSING POOR FLUE GAS READINGS 2

HEAT EXCHANGER (38C)

Next: End

PARTIALLY RESTRICTED CAUSING POOR FLUE GAS READINGS

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

CLOGGED SCROLL POOR DHW

FAN ASSEMBLY

Next: End

BLANK FOR FLUE GAS ANALYSIS FROM SEQUENCE OF OPS CH 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO POWER TO PRESSURE SENSOR F47

PCB

Next: End

PRESSURE SENSOR F47

HARNESS

Next: End

FLUE OVERHEAT

INSULATION PADS

Next: End

NOT SPARKING

IGNITION LEAD END DAMAGED

Next: End

F37

PARAMETERS LOW WATER PROTECTION

Next: End

OVERHEATING AFTER DEMAND

PCB PUMP OVER RUN

Next: End

HOT SPOTS CAUSING OVERHEAT

HEAT EXCHANGER (38C)

Next: End

BLANK FOR INSTALLER MODE

Z DIRECTION CHOICE OR CONTINUE

Next: End

INCORRECT OVERRUNS MAIN MODEL

PCB PUMP OVER RUN

Next: End

NOT SPARKING

IGNITION CAP

Next: End

FAN DC SECTION 3

HARNESS

Next: End

NO PEMANENT DC VOLTAGE TO FAN 2

PCB

Next: End

FAULTY HALL SENSOR 2

FAN ASSEMBLY

Next: End

RESISTANCE HIGH OR POOR CONDITION

LEAD IGNITION W/O PLUG

Next: End

FAULTY SPEED CONTROL

FAN ASSEMBLY

Next: End

FAULTY SPEED CONTROL 2

FAN ASSEMBLY

Next: End

LOW CAUSING BAFFLING

GAS INLET PRESSURE

Next: End

BLOCKED CAUSING BAFFLING

TRAP CONDENSATE OR PIPE

Next: End

RESTRICTED OR BLOCKED

SUMP AND PIPE

Next: End

PARTIALLY RESTRICTED CAUSING WRONG MIX

INJECTOR 6.5 - MAIN - NG (38C)

Next: End

RESTRICTED HIGH FAN PRESSURE

SUMP AND PIPE

Next: End

RESTRICTED CAUSING LOW FAN PRESSURE

FLUE

Next: End

RESTRICTED CAUSING HIGH FAN PRESSURE

BURNER - CERAMIC (38C)

Next: End

GAS VALVE SECTION

HARNESS

Next: End

SPLIT NOT OPENING GAS VALVE

AIR IMPULSE TUBE

Next: End

NOT LIGHTING

ELECTRODE IGNITION

Next: End

EXTERNAL CONTROLS

Next: End

EXTERNAL CONTROLS 2

Next: End

NOT RESPONDING TO INCREASE IN TEMPERATURE

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

SLOW OR WEAK 2

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

BLOCKED OR RESTRICTED

PRIMARY FILTER

Next: End

EXTERNAL CONTROLS (NOISY 2)

Next: End

EXTERNAL CONTROLS (NOISY)

Next: End

RESTRICTED OR BLOCKED 2

RETURN FILTER CH

Next: End

RESTRICTED OR BLOCKED 3

RETURN FILTER CH

Next: End

DIVERTER VALVE

HARNESS

Next: End

NOT OPERATING DIVERTER FOR CH

PCB

Next: End

OPEN TOO MUCH

Next: End

SLOW OR WEAK 3

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

FULLY OR PARTIALLY CLOSED

ISOLATION VALVES FLOW AND RETURN

Next: End

DIVERTER VALVE 2

HARNESS

Next: End

NOT OPERATING DIVERTER FOR DHW

PCB

Next: End

PASSING

VALVE - BY-PASS C/W NRV

Next: End

BLOCKED CAUSING HIGH FAN PRESSURE

TRAP CONDENSATE OR PIPE

Next: End

NOT RESPONDING TO INCREASE IN TEMP

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

BLANK FOR F FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR CASE OFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FUNCTIONAL SEQUENCE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN AC SECTION

HARNESS

Next: End

NO DEMAND VOLTAGE TO FAN

PCB

Next: End

FAN DC SECTION

HARNESS

Next: End

FAN DC SECTION 2

HARNESS

Next: End

NO PEMANENT DC VOLTAGE TO FAN

PCB

Next: End

FAULTY HALL SENSOR

FAN ASSEMBLY

Next: End

BLANK FOR FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

PUMP

HARNESS

Next: End

CAUSING PUMP TO RUN CONTINUALLY

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

CAUSING PUMP TO RUN CONTINUALLY

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

FROST PROTECTION

Next: End

CORRECTLY ACTIVATED APPLIANCE COLD

FROST PROTECTION

Next: End

READING COLD WHEN NOT

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

PRE HEAT NOT OPERATING

PCB

Next: End

SHORTING TO EARTH

ELECTRODE - FLAME SENSING

Next: End

EXTERNAL CONTROLS WIRELESS CONTROLS

Next: End

NO POWER TO WIRELESS CONTROL

PCB

Next: End

BLOWN THROUGH FATIGUE

FUSE MAINS

Next: End

BLANK FOR FUSE FH1

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FUSE FH2

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR NO DISPLAY INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR TYPE OF DIAGNOSTIC PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE

SENSOR 10K NTC - EXCHANGER C/W BRACKET

Next: End

FAULT CODE

SENSOR 100 DEGREE C THERMOSTAT / FLOW COMBINED

Next: End

SET INCORRECTLY NO DHW THERMISTOR

PARAMETERS

Next: End

NO POWER TO PRESSURE SWITCH FAULT CODE

PCB

Next: End

PRESSURE SENSOR FAULT CODE

HARNESS

Next: End

FAULT CODE

SENSOR - FLUE C/W COLLAR

Next: End

NOT FOR UK MARKET

PCB

Next: End

POLARITY PROBLEM

Next: End

BLOCKED F36 A26

TRAP CONDENSATE OR PIPE

Next: End

BLOCKED F36 A36

SUMP AND PIPE

Next: End

SHORTING TO EARTH F36 A25

ELECTRODE - FLAME SENSING

Next: End

SHORTING TO EARTH F36 A25

ELECTRODE IGNITION

Next: End

RESISTANCE INCORRECT

GAS VALVE

Next: End

F39 FAULT CODE

OUTDOOR SENSOR

Next: End

BLANK FOR WIRING OR WATER INGRESS

Z DIRECTION CHOICE OR CONTINUE

Next: End

RESISTANCE INCORRECT FUSE INVESTIGATION

GAS VALVE

Next: End

SHORTING

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

DC SECTION SHORTING

FAN ASSEMBLY

Next: End

AC SECTION SHORTING

FAN ASSEMBLY

Next: End

NOT RECOGNISING DHW DEMAND

PCB

Next: End

NOT RECOGNISING DEMAND

FLOW METER

Next: End

NOT SPARKING

IGNITION ELECTRODE INTERNAL

Next: End

CAUSING SHORT TO EARTH

IGNITION ELECTRODE INTERNAL

Next: End

RESTRICTED OR BLOCKED

PLATE - HEAT EXCHANGER (38C)

Next: End

NO DEMAND TO BOILER POOR DHW

Next: End

NOT RECOGNISING CH DEMAND POOR DHW 2

PCB

Next: End

NO DEMAND TO BOILER POOR DHW 2

Next: End

NOT RECOGNISING CH DEMAND POOR DHW

PCB

Next: End

RESTRICTED OR BLOCKED

HEAT EXCHANGER (38C)

Next: End

NOT SPARKING 2

IGNITION ELECTRODE INTERNAL

Next: End

CAUSING SHORT TO EARTH 2

IGNITION ELECTRODE INTERNAL

Next: End

EXPANSION VESSEL PIPE

EXPANSION VESSEL PIPE

Next: End

NOT RUNNING FAN WITH DEMAND

PCB

Next: End

DISPLAY JUMBLED

PCB

Next: End

PASSING CAUSING A02

GAS VALVE

Next: End

NOT READING PRESSURE CORRECTLY FAULT CODELOW PRESSURE

SENSOR - LOW WATER PRESSURE KIT

Next: End

WRONG MIX NOT IGNITING

GAS VALVE

Next: End

WRONG MIX BAFFLING

GAS VALVE

Next: End

WRONG MIX EXPLOSIVE IGNITION

GAS VALVE

Next: End

STATING A06 INCORRECTLY

PCB

Next: End

A06 FAULT CODE

GAS VALVE

Next: End

SCALED CAUSING NOISE

HEAT EXCHANGER (38C)

Next: End

NO DEMAND TO BOILER POOR DHW OVERHEAT

Next: End

NOT RECOGNISING CH DEMAND POOR DHW 2 OVERHEAT

PCB

Next: End

NO DEMAND TO BOILER POOR DHW 2 OVERHEAT

Next: End

NOT RECOGNISING CH DEMAND POOR DHW OVERHEAT

PCB

Next: End

RESTRICTED OR BLOCKED OVERHEAT

HEAT EXCHANGER (38C)

Next: End

CAUSING POOR EMISSIONS OR BURNER DROP OUT 2

GAS VALVE ADJUSTMENT

Next: End

INTERMITTENT IGNITION FAULT

PCB

Next: End

INTERMITTENT IGNITION FAULT IGNITION PROBLEMS 3

PCB

Next: End

OVERHEAT 2

OVERHEAT - PCB

Next: End

NOT MODULATING DHW

PCB

Next: End

NOT MODULATING CH

PCB

Next: End

NOT READING PRESSURE CORRECTLY REPEAT OVERPESSURE

SENSOR - LOW WATER PRESSURE KIT

Next: End

PULSING PUMP UNECESSARILY REPEAT OVERPESSURE

PCB

Next: End

BLOCKED FAULT CODE

EXPANSION VESSEL PIPE

Next: End

BLOCKED FAULT CODE FAULT CODE

EXPANSION VESSEL PIPE

Next: End

SCALED POOR DHW FLOW

PLATE - HEAT EXCHANGER (38C)

Next: End

POOR DHW FLOW

DHW INLET FILTER

Next: End

POOR DHW FLOW

RESTRICTOR - FLOW - 12 LITRE (38C)

Next: End

RESTRICTED BLOCKED OR JAMMED

FLOW METER

Next: End

NOT OPENING

GAS VALVE

Next: End

NO POWER TO GAS VALVE

PCB

Next: End

HARNESS GONE DAMAGED PCB

PCB AND HARNESS

Next: End

NOT RUNNING OVERHEAT

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

NO POWER TO PUMP OVERHEAT

PCB

Next: End

FLOW THERMISTOR FAULT CODE F42

HARNESS

Next: End

NOT RUNNING OVERHEAT F42

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

NO POWER TO PUMP OVERHEAT F42

PCB

Next: End

NO DEMAND TO BOILER POOR DHW OVERHEAT F42

Next: End

NOT RECOGNISING CH DEMAND POOR DHW 2 OVERHEAT F42

PCB

Next: End

NO DEMAND TO BOILER POOR DHW 2 OVERHEAT F42

Next: End

NOT RECOGNISING CH DEMAND POOR DHW OVERHEAT F42

PCB

Next: End

RESTRICTED OR BLOCKED OVERHEAT F42

HEAT EXCHANGER (38C)

Next: End

OVERHEAT F42

OVERHEAT - PCB

Next: End

AFTER FURTHER INVESTIGATION

PCB NO DISPLAY

Next: End

PULSING PUMP UNECESSARILY

PCB

Next: End

NOT READING PRESSURE CORRECTLY

SENSOR - LOW WATER PRESSURE KIT

Next: End

NOT RUNNING WITH AC VOLTAGE NO DISPLAY

FAN ASSEMBLY

Next: End

NO AC VOLTAGE TO FAN NO DISPLAY

PCB

Next: End

NOT RECTIFYING

PCB

Next: End

NOT RUNNING WITH DEMAND VOLTAGE NO DISPLAY

FAN ASSEMBLY

Next: End

PUMP RUNNING CONTINUALLY NO DISPLAY

PCB

Next: End

NOT RUNNING NO DISPLAY

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

NO POWER TO PUMP NO DISPLAY

PCB

Next: End

SHORTING

FLOW METER

Next: End

SHORTING

SENSOR - LOW WATER PRESSURE KIT

Next: End

RETURN THERMISTOR

HARNESS

Next: End

FLOW THERMISTOR

HARNESS

Next: End

NO DISPLAY

PCB

Next: End

FLUE THERMISTOR

HARNESS

Next: End

NOT SWITCHING

INTEGRAL TIMER

Next: End

NOT RECTIFYING

ELECTRODE - FLAME SENSING

Next: End

NOT SWITCHING POOR DHW

INTEGRAL TIMER

Next: End

NOT SWITCHING (NOISY)

INTEGRAL TIMER

Next: End

NOT SWITCHING POOR DHW OVERHEAT

INTEGRAL TIMER

Next: End

NOT SWITCHING POOR DHW OVERHEAT F42

INTEGRAL TIMER

Next: End

OPEN OR PASSING ALLOWING FLOW

HOT WATER OUTLETS

Next: End

REGISTERING DEMAND WHEN NONE PRESENT

FLOW METER

Next: End

CAUSING POOR EMISSIONS OR BURNER DROP OUT 3

GAS VALVE ADJUSTMENT

Next: End

POOR DHW

PCB

Next: End

BLANK FOR FLUE GAS ANALYSIS FROM SEQUENCE OF OPS CH

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT REGISTERING VOLTAGE FROM PRESSURE SENSOR F47

PCB

Next: End

NOT REGISTERING PRESSURE F47

SENSOR - LOW WATER PRESSURE KIT

Next: End

F37 FAULT CODE

PCB

Next: End

OVERHEATING

PCB

Next: End

NOT CONTROLING FAN CORRECTLY

PCB

Next: End

FAULTY SPEED CONTROL 2

PCB

Next: End

DROPPING AWAY COMPLETELY

GAS INLET PRESSURE

Next: End

CLOGGED SCROLL

FAN ASSEMBLY

Next: End

RESTRICTED HIGH PRESSURE

HEAT EXCHANGER (38C)

Next: End

NO DEMAND TO BOILER

Next: End

NOT RECOGNISING CH DEMAND

PCB

Next: End

NO DEMAND TO BOILER 2

Next: End

NOT RECOGNISING CH DEMAND 2

PCB

Next: End

NOT CONTROLLING DHW TEMPERATURE

PCB

Next: End

BLOCKED CAUSING NOISE

PLATE - HEAT EXCHANGER (38C)

Next: End

NO DEMAND TO BOILER (NOISY) 2

Next: End

NOT RECOGNISING CH DEMAND (NOISY 2)

PCB

Next: End

NO DEMAND TO BOILER (NOISY)

Next: End

NOT RECOGNISING CH DEMAND (NOISY)

PCB

Next: End

RESTRICTED OR BLOCKED NO CIRCULATION

Next: End

RESTRICTED OR BLOCKED NO CIRCULATION 2

Next: End

NO PERMANENT VOLTAGE TO DIVERTER

PCB

Next: End

WINDINGS GONE

DIVERTER VALVE ASSEMBLY

Next: End

WINDINGS OK NO MOVEMENT CH

DIVERTER VALVE ASSEMBLY

Next: End

NO PERMANENT VOLTAGE TO DIVERTER DHW

PCB

Next: End

WINDINGS GONE 2

DIVERTER VALVE ASSEMBLY

Next: End

WINDINGS OK NO MOVEMENT DHW

DIVERTER VALVE ASSEMBLY

Next: End

NOT RUNNING WITH AC VOLTAGE

FAN ASSEMBLY

Next: End

NO AC VOLTAGE TO FAN

PCB

Next: End

NOT RUNNING WITH DEMAND VOLTAGE

FAN ASSEMBLY

Next: End

NOT REGISTERING HALL SENSOR SIGNAL FROM FAN

PCB

Next: End

BLANK FOR FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT RUNNING

PUMP ASSEMBLY - GRUNDFOS (38C)

Next: End

NO POWER TO PUMP

PCB

Next: End

PUMP RUNNING CONTINUALLY

PCB

Next: End

FIRING HEATING INCORRECTLY

PCB

Next: End

NO PERMANENT RECTIFICATION VOLTAGE

PCB

Next: End

SHORTING TO EARTH

RECTIFICATION LEAD

Next: End

NOT RECOGNISING CH DEMAND WIRELESS CONTROLS

PCB

Next: End

NOT OPERATING

WIRELESS CONTROL

Next: End

NO MAINS POWER

Next: End

BLANK FOR MAINS FUSE INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLOWN THROUGH FATIGUE

FUSE FH1

Next: End

BLOWN THROUGH FATIGUE

FUSE FH2

Next: End

FAULTY DISPLAY CHOOSE TO REPLACE

PCB

Next: End

INCORRECTLY SHOWING RETURN THERMISTOR FAULT

PCB

Next: End

RETURN THERMISTOR FAULT CODE

HARNESS

Next: End

INCORRECTLY SHOWING FLOW / STAT THERIMISTOR FAULT

PCB

Next: End

FLOW THERMISTOR FAULT CODE

HARNESS

Next: End

PULSING PUMP UNECESSARILY FAULT CODE

PCB

Next: End

NOT READING PRESSURE CORRECTLY FAULT CODE

SENSOR - LOW WATER PRESSURE KIT

Next: End

INCORRECTLY SHOWING FLUE THERMISTOR FAULT

PCB

Next: End

FLUE THERMISTOR FAULT CODE

HARNESS

Next: End

STATING INCORRECT POLARITY WHEN OK

PCB

Next: End

A02 SENSING FLAME WHEN NOT PRESENT

PCB

Next: End

SHORTING TO EARTH F36 A25

RECTIFICATION LEAD

Next: End

F36 A25 FAULT CODE

PCB

Next: End

INCORRECTLY FAULTING A62

PCB

Next: End

GAS VALVE SECTION A62

HARNESS

Next: End

OUTSIDE SENSOR FAULT F39

PCB

Next: End

MODULATING INCORRECTLY OR NOT RAMPING UP

PCB

Next: End

GAS VALVE SECTION A62 FUSE INVESTIGATION

HARNESS

Next: End

PUMP SECTION SHORTING

HARNESS

Next: End

PCB TAKING OUT FUSES

PCB - FUSE

Next: End

FAN DC SECTION SHORTING

HARNESS

Next: End

FAN AC SECTION SHORTING

HARNESS

Next: End

TEMPERATURE DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL CH

Next: p1185

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH NOISY?

Next: p1187

DISPLAY DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATION

Next: p566

DISPLAY OPERATES BUT IS JUMBLED OR DISTORTED

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATION

Next: !p15

TEMPERATURE DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL CH

Next: p1785

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH NOISY?

Next: p1787

FILTER RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW SWITCH, FILTER AND RESTRICTOR

Next: !p2075

FLOW LIMITER RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW SWITCH, FILTER AND RESTRICTOR

Next: !p2077

FLOW TURBINE ASSEMBLY RESTRICTED BLOCKED OR JAMMED

CHARACTERISTIC TEST FROM INSPECTION FLOW SWITCH, FILTER AND RESTRICTOR

Next: !p2079

NO SPARKING OBSERVED

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p221

TEMPERATURE DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL CH

Next: p2270

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH NOISY?

Next: p2272

PUMP DOES NOT RUN BUT FAN BEHAVES AS DESCRIBED ABOVE

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK (NO DISPLAY)

Next: p2298

PUMP RUNS CONTINUOUSLY BUT FAN BEHAVES AS DESCRIBED ABOVE

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK (NO DISPLAY)

Next: p2300

PUMP ONLY PULSES TWICE OR FAN DOES NOT BEHAVE AS DESCRIBED ABOVE

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK (NO DISPLAY)

Next: p2302

PUMP ONLY PULSES TWICE BUT FAN BEHAVES AS DESCRIBED ABOVE

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK (NO DISPLAY)

Next: p2304

FAN DOES NOT STOP WHEN PURGE PERIOD ENDS

CHARACTERISTIC TEST FROM OBSERVATION FAN PURGE AND PUMP PULSE

Next: p2462

INLET PRESSURE SATISFACTORY BUT DOES NOT DIP DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: p276

INLET PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: !p272

FAN PRESSURE EXCESSIVELY LOW (E G 1MB)

CHARACTERISTIC TEST FROM PRESSURE FAN

Next: !p286

FAN PRESSURE EXCESSIVELY HIGH (E G 3MB OR GREATER)

CHARACTERISTIC TEST FROM PRESSURE FAN

Next: p288

BOILER STILL NOISY

CHARACTERISTIC TEST FROM OPERATION CH NOISY?

Next: p344

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH NOISY?

Next: p351

VOLTAGE MISSING FROM PIN 1 OR 4

CHARACTERISTIC TEST FROM VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

Next: !p421

VOLTAGE PRESENT ON PIN 1 AND 4 BUT ABSENT FROM ONE OR MORE OTHER PINS

CHARACTERISTIC TEST FROM VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

Next: p423

VOLTAGE MISSING FROM PIN 1 OR 4

CHARACTERISTIC TEST FROM VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

Next: !p434

VOLTAGE PRESENT ON PIN 1 AND 4 BUT ABSENT FROM ONE OR MORE OTHER PINS

CHARACTERISTIC TEST FROM VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

Next: p436

FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION FAN PURGE AND PUMP PULSE

Next: p500

FAN BEHAVES AS DESCRIBED BUT PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN PURGE AND PUMP PULSE

Next: p510

FAN BEHAVES AS DESCRIBED BUT PUMP RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION FAN PURGE AND PUMP PULSE

Next: p516

BOILER TRIES TO RUN AND / OR FIRE STRAIGHT AFTER PUMP AND FAN PURGE

CHARACTERISTIC TEST FROM OBSERVATION FAN PURGE AND PUMP PULSE

Next: p522

BURNER IGNITES BUT LIGHTS WITH EXPLOSIVE IGNITION

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1233

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p67

BURNER IGNITES BUT THEN BAFFLES OR DROPS OUT

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p254

BURNER IGNITES SMOOTHLY BUT FAILS TO ESTABLISH (SPARKING CONTINUES)

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p71

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1984

DHW TOO COOL RADS REMAIN COOL WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1174

DHW TOO COOL RADS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p431

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2095

BOILER UP TO TEMPERATURE BUT RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p84

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: !p86

09/04/2018 08:25:50 1610_1_50_1 09/04/2018 08:43:25

09/04/2018 08:21:20

Next: End

VOLTAGE DC FROM TURBINE

{GAINPCBACS}

Next: !p103, f104

OBSERVATION SYSTEM PRESSURE RISE (OVERHEAT)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p1034, !f1035

VOLTAGE DC TO TURBINE

Next: p105, !f106

TEMPERATURE DIFFERENTIAL CH

BOILER CH THERMOSTAT

Next: !p1183, ?1184, ?1186

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p1190, f1191

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1192, !f1193

OBSERVATION RE WIRE (TIMER BYPASSED)

LINK OUT THE OPENTHERM TERMINALS AS SHOWN IN THE IMAGE

Next: p2361, f1197

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1198, !f1199

RESISTANCE IGNITION LEAD (MODIFIED)

REMOVE THE IGNITION LEAD FROM THE PCB AND FROM THE SPARK ELECTRODE

Next: p1216, !f1217

RESISTANCE IGNITION LEAD (MODIFIED)

REMOVE THE IGNITION LEAD FROM THE PCB AND FROM THE SPARK ELECTRODE

Next: !p1229, !f1230

PRESSURE GAS INLET - FOR FAULT HISTORY

ATTACH PRESSURE GAUG

Next: p1417, !f1281

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p132, !f133

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p136, !f137

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1812, !f1420

RESISTANCE IGNITION LEAD (MODIFIED)

REMOVE THE IGNITION LEAD FROM THE PCB AND FROM THE SPARK ELECTRODE

Next: p1434, !f1435

VOLTAGE GAS VALVE BURNER SHUT DOWN

{GAINPCBACS}
ECO

Next: !p1611, !f1612

OBSERVATION SYSTEM PRESSURE

Next: p1966, !f1647

VOLTAGE DC TO PRESSURE SENSOR

Next: p1643, !f1644

OBSERVATION BURNER REMAINS ALIGHT

Next: !p1731, f1732

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1733, !f1734

INSPECTION VALVES FLOW AND RETURN

Next: p1771, !f1810

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p1790, f1791

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1792, !f1793

OBSERVATION RE WIRE (TIMER BYPASSED)

LINK OUT THE OPENTHERM TERMINALS AS SHOWN IN THE IMAGE

Next: p2367, f1797

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p1798, !f1799

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1992, !f1997

OBSERVATION SENSORS CORRECTLY FITTED

Next: !p1999, !f2000

VOLTAGE DC TO PRESSURE SENSOR

Next: p2033, !f2034

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p2039, !f2040

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p2051, !f2052

WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p2056, !f2080

RESISTANCE GAS VALVE AND HARNESS AND TO EARTH

REMOVE CONNECTOR X4 FROM THE PCB

Next: !p2163, f2164

RESISTANCE GAS VALVE

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p2165, !f2166

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2201, f2202

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2203, !f2204

RESISTANCE THERMISTOR FLOW / STAT AND HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: p2211, f2208

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p2209, !f2210

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2261, f2262

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2263, !f2264

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p2275, f2276

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p2277, !f2278

OBSERVATION RE WIRE (TIMER BYPASSED)

LINK OUT THE OPENTHERM TERMINALS AS SHOWN IN THE IMAGE

Next: p2370, f2282

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p2283, !f2284

OBSERVATION SELF CHECK (NO DISPLAY)

ENSURE NO DEMANDS

Next: !p2296, ?2297, ?2299, ?2301, ?2303

VOLTAGE DC TO PRESSURE SENSOR

Next: p2309, !f2310

OBSERVATION FAN (DC CONNECTOR REMOVED)

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
AND MAKE SAFE

Next: p2315, f2316

VOLTAGE AC TO FAN

Next: !p2317, f2318

RESISTANCE HARNESS FAN AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X4 FROM THE PCB

Next: !p2319, !f2320

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2337, !f2338

RESISTANCE RECTIFICATION LEAD

REMOVE THE CONNECTOR FROM THE FLAME SENSE ELECTRODE
REMOVE CONNECTOR X12 FROM THE PCB

Next: !p236, !f237

OBSERVATION X5 CONNECTED TURBINE DISCONNECTED (DISPLAY OPERATES?)

REFIT CONNECTOR X5 TO THE PCB
REMOVE THE CONNECTOR FROM THE FLOW TURBINE

Next: !p2341, f2342

OBSERVATION X5 CONNECTED PRESSURE SENSOR DISCONNECTED

REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR AND MAKE SAFE

Next: !p2343, !f2344

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p2348, !f2349

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p2352, !f2353

RESISTANCE THERMISTOR FLUE

REMOVE THE TWO SPADE CONNECTORS FROM THE FLUE THERMISTOR

Next: !p2356, !f2357

OBSERVATION ISOLATE DHW DOES DEMAND STOP

ISOLATE THE DHW SUPPLY TO THE APPLIANCE ON THE
ISOLATING VALVE UNDERNEATH THE APPLIANCE

Next: !p2374, f2377

VOLTAGE DC FROM TURBINE (FIRING WITH NO DEMAND)

{GAINPCBACS}

Next: !p2383, !f2380

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p2386, !f2387

FLUE GAS ANALYSIS CH FROM SEQUENCE OF OPS

Next: !p2409, !f2423

VOLTAGE DC FROM PRESSURE SENSOR

{GAINPCBACS}

Next: !p2426, f2427

VOLTAGE DC TO PRESSURE SENSOR

Next: p2428, !f2429

OBSERVATION INTEGRAL TIMER

Next: p312, f313

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p316, f315

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p317, !f318

OBSERVATION RE WIRE (TIMER BYPASSED)

LINK OUT THE OPENTHERM TERMINALS AS SHOWN IN THE IMAGE

Next: p2358, f322

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p323, !f324

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p354, f355

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p356, !f357

OBSERVATION RE WIRE (TIMER BYPASSED)

LINK OUT THE OPENTHERM TERMINALS AS SHOWN IN THE IMAGE

Next: p2364, f361

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p362, !f363

VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

{GAINPCBACS}

Next: p410, ?420, ?422

INSPECTION FILTER RETURN

BOILER DRAINED AND D

Next: p415, !f414

OBSERVATION FAN RUNNING

NO DEMANDS

Next: p483, f472

OBSERVATION FAN (DC CONNECTOR REMOVED)

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
AND MAKE SAFE

Next: p473, f474

VOLTAGE AC TO FAN

Next: !p475, f476

RESISTANCE HARNESS FAN AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X4 FROM THE PCB

Next: !p477, !f478

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p513, !f514

RESISTANCE RECTIFICATION LEAD AND ELECTRODE TO EARTH

REMOVE CONNECTOR X12 FROM THE PCB

Next: !p551, f550

RESISTANCE RECTIFICATION ELECTRODE TO EARTH

REMOVE THE LEAD FROM THE RECTIFICATION ELECTRODE

Next: !p554, !f555

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: p563, f560

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X5 FROM THE PCB

Next: !p561, !f562

VOLTAGE PCB MAINS INPUT

{GAINPCBACS}

Next: p589, f590

RESISTANCE FUSE MAINS

REMOVE FUSE FROM FUSED SPUR OR PLUG

Next: !p591, f592

FURTHER INVESTIGATION FUSE (MAINS)

Next: !p593, !f594

FURTHER INVESTIGATION FUSE (FH1)

Next: !p597, !f598

FURTHER INVESTIGATION FUSE (FH2)

Next: !p601, !f602

RESISTANCE THERMISTOR AND HARNESS RETURN

REMOVE CONNECTOR X7 FROM THE PCB

Next: !p728, f727

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p729, !f730

RESISTANCE THERMISTOR FLOW / STAT AND HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p733, f734

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p735, !f736

OBSERVATION SYSTEM PRESSURE

Next: p1975, !f1635

VOLTAGE DC TO PRESSURE SENSOR

Next: p755, !f756

OBSERVATION SYSTEM PRESSURE

Next: p2006, !f1636

RESISTANCE THERMISTOR AND HARNESS FLUE

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p777, f776

RESISTANCE THERMISTOR FLUE

REMOVE THE TWO SPADE CONNECTORS FROM THE FLUE THERMISTOR

Next: !p778, !f779

VOLTAGE POLARITY

{GAINPCBACS}

Next: !p786, !f787

OBSERVATION BURNER EXTINGUISH ON DEMAND END

ECO MODE ON
ENSUR

Next: !p792, f1610

INSPECTION CONDENSATE PIPE

Next: p796, !f797

INSPECTION RECTIFICATION ELECTRODE

REMOVE RECTIFICATION ELECTRODE

Next: !p801, !f802

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: p1224, !f807

RESISTANCE GAS VALVE AND HARNESS AND TO EARTH

REMOVE CONNECTOR X4 FROM THE PCB

Next: !p810, f811

RESISTANCE GAS VALVE

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p812, !f813

OBSERVATION DISCONNECT OUTSIDE SENSOR

REMOVE THE TWO WIRES

Next: !p816, !f818

RESISTANCE PUMP AND HARNESS AND TO EARTH

REMOVE CONNECTOR X3 FROM THE PCB

Next: p858, f865

RESISTANCE GAS VALVE

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p861, !f862

RESISTANCE PUMP AND TO EARTH

REMOVE THE COVER FROM THE PUMP

Next: !p867, !f868

RESISTANCE FAN AND TO EARTH (AC)

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p876, !f877

RESISTANCE FAN AND TO EARTH (DC)

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p874, !f875

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1751, !f1037

RESISTANCE HARNESS TURBINE

REMOVE THE CONNECTOR FROM THE FLOW TURBINE
REMOVE CONNECTOR X5 FROM THE PCB

Next: !p107, !f108

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: !p1102, !f1101

RESISTANCE IGNITION LEAD AND CAP

REMOVE IGNITION LEAD FROM ELECTRODE
REMOVE IGNITION LEAD FROM PCB

Next: !p1104, !f1105

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1650, !f1115

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1131, !f1142

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: p1132, !f1133

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1670, !f1135

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: p1175, !f1176

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p1177, !f1178

LIMPET PUMP

Next: p1179, !f1180

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: p1907, f1182

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE PRIMARY CIRCUIT WATER DRAINED

Next: p1200, !f1201

OBSERVATION INTEGRAL TIMER

Next: p1188, f1189

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p1194, f1195

INSPECTION FILTER RETURN

BOILER DRAINED AND D

Next: !p1202, !f1766

OBSERVATION IGNITION LEAD

Next: p240, f1215

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: !p1218, !f1219

OBSERVATION IGNITION LEAD

Next: p1103, f1228

OBSERVATION CHECK IGNITION LEVEL IN PARAMETERS

Next: p1690, !f1561

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p138, !f139

FLUE GAS ANALYSIS

Next: p1499, f1418

OBSERVATION IGNITION LEAD

Next: p1432, f1433

INSPECTION IGNITION LEAD END

REMOVE THE CAP FROM THE SPARK ELECTRODE
UNSCREW IT ANTICLOCKWISE FROM THE IGNITION LEAD

Next: p1438, !f1439

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: p1537, !f1437

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB

Next: p1440, !f1441

RESISTANCE IGNITION CAP

Next: p1442, !f1443

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: p1444, !f1445

INSPECTION CONDENSATE PIPE

Next: p1446, !f1447

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p1448, !f1449

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1823, !f1451

RESISTANCE GAS VALVE

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: p1431, !f1498

OBSERVATION CHECK IGNITION LEVEL IN PARAMETERS FOR FAULT HISTORY

Next: p1836, !f2094

INSPECTION CONDENSATE PIPE

Next: p1538, !f1539

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p1540, !f1541

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1891, !f1543

VOLTAGE DC FROM PRESSURE SENSOR

{GAINPCBACS}

Next: p2439, f1642

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR X5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR

Next: !p1645, !f1646

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1653, !f1652

INSPECTION ELECTRODE INTERNAL

REMOVE BURNER ASSEMBLY

Next: p1654, !f1655

INSPECTION BURNER

REMOVE BURNER

Next: !p1657, !f1656

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1660, !f1659

INSPECTION FLUE

Next: p1661, !f1662

INSPECTION BURNER

REMOVE BURNER

Next: p1664, !f1663

INSPECTION INSULATION PADS

Next: p1665, !f1666

INSPECTION HEAT EXCHANGER

Next: !p1667, !f1668

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1673, !f1672

INSPECTION ELECTRODE INTERNAL

REMOVE BURNER ASSEMBLY

Next: p2001, !f1675

INSPECTION BURNER

REMOVE BURNER

Next: !p1677, !f1676

OBSERVATION SPARKING FROM PCB

{GAINPCBACS}
USIN

Next: p1130, !f1704

INSPECTION CONDENSATE PIPE

Next: p1735, !f1736

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p1737, !f1738

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1739, !f1740

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1741, !f1742

INSPECTION FLUE

Next: p1743, !f1744

INSPECTION BURNER

REMOVE BURNER

Next: p1745, !f1746

INSPECTION INSULATION PADS

Next: p1747, !f1748

INSPECTION HEAT EXCHANGER

Next: !p1749, !f1750

RESISTANCE THERMISTOR FLUE

REMOVE THE TWO SPADE CONNECTORS FROM THE FLUE THERMISTOR

Next: p1753, !f1752

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p1754, !f1755

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: p1757, !f1756

LIMPET PUMP

Next: p1758, !f1759

INSPECTION BURNER GASKETS AND HEAT EXCHANGER OUTER

Next: p1760, !f1761

INSPECTION FLUE

Next: p2433, !f1763

INSPECTION HEAT EXCHANGER

Next: !p1905, !f1765

OBSERVATION SYSTEM PRESSURE RISE (OVERHEAT)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p1772, !f1773

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1774, !f1775

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p1776, !f1777

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: p2167, !f1779

LIMPET PUMP

Next: p1780, !f1781

TEMPERATURE DIFFERENTIAL CH

BOILER CH THERMOSTAT

Next: p1782, ?1784, ?1786

TEMPERATURE DIFFERENTIAL DHW (OVERHEAT)

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: p2445, !f1809

INSPECTION EXTERNAL BYPASS

Next: p1800, !f1801

OBSERVATION INTEGRAL TIMER

Next: p1788, f1789

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p1794, f1795

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE PRIMARY CIRCUIT WATER DRAINED

Next: p1802, !f1803

INSPECTION FILTER RETURN

BOILER DRAINED AND D

Next: p1804, !f1805

INSPECTION INTEGRAL BYPASS (RESTRICTED OR BLOCKED)

APPLIANCE DRAINED AND DISCHARGED

Next: !p1806, !f1807

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1814, !f1813

INSPECTION FLUE

Next: p1815, !f1816

INSPECTION BURNER

REMOVE BURNER

Next: p1818, !f1817

INSPECTION INSULATION PADS

Next: p1819, !f1820

INSPECTION HEAT EXCHANGER

Next: !p1821, !f1822

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1825, !f1824

INSPECTION FLUE

Next: p1826, !f1827

INSPECTION ELECTRODE INTERNAL

REMOVE BURNER ASSEMBLY

Next: p1828, !f1829

INSPECTION BURNER

REMOVE BURNER

Next: p1831, !f1830

INSPECTION INSULATION PADS

Next: p1832, !f1833

INSPECTION HEAT EXCHANGER

Next: !p1834, !f1835

OBSERVATION SPARKING FROM PCB

{GAINPCBACS}
USIN

Next: p1464, !f1890

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p1893, !f1892

INSPECTION FLUE

Next: p1894, !f1895

INSPECTION ELECTRODE INTERNAL

REMOVE BURNER ASSEMBLY

Next: p1896, !f1897

INSPECTION BURNER

REMOVE BURNER

Next: p1899, !f1898

INSPECTION INSULATION PADS

Next: p1900, !f1901

INSPECTION HEAT EXCHANGER

Next: !p1902, !f1903

PRESSURE GAS INLET FOR DHW

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2398, !f1908

OBSERVATION SYSTEM PRESSURE RISE (PRESSURE FAULT CODE)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p1639, !f1974

OBSERVATION SYSTEM PRESSURE RISE (PRESSURE FAULT CODE)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p2042, !f1983

OBSERVATION SENSORS CORRECTLY FITTED

Next: p73, !f1990

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: p1993, !f1994

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p1995, !f1996

INSPECTION INSULATION PADS

Next: p1674, !f2005

OBSERVATION SYSTEM PRESSURE RISE (PRESSURE FAULT CODE)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p2030, !f2041

VOLTAGE DC FROM PRESSURE SENSOR

{GAINPCBACS}

Next: p2031, f2032

OBSERVATION SYSTEM PRESSURE RISE

BOILER CH THERMOSTAT TO MAX

Next: !p2037, f2038

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR X5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR

Next: !p2035, !f2036

OBSERVATION SYSTEM PRESSURE RISE

BOILER CH THERMOSTAT TO MAX

Next: p751, f2050

INSPECTION DHW ISOLATION VALVE

Next: p2072, !f2061

INSPECTION FLOW SWITCH, FILTER AND RESTRICTOR

ISOLATE THE WATER SUPPLY TO THE APPLIANCE

Next: !p2073, ?2074, ?2076, ?2078

OBSERVATION SYSTEM PRESSURE

Next: p79, !f2119

INSPECTION AIR IMPULSE TUBE

Next: p2133, !f2132

INSPECTION CONDENSATE PIPE

Next: p2145, !f2157

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p268, !f2158

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: !p2160, !f2161

OBSERVATION PUMP RUNNING FOR OVERHEAT

ENSURE APPLIANCE IS

Next: p1778, f2200

OBSERVATION SPARKING FROM PCB

{GAINPCBACS}
USIN

Next: p1205, !f227

INSPECTION VALVES FLOW AND RETURN

Next: p2212, !f2213

OBSERVATION SYSTEM PRESSURE RISE (OVERHEAT)

OBSERVE THE MANUAL PRESSURE GAUGE ON THE UNDERSIDE OF THE APPLIANCE

Next: p2214, !f2215

OBSERVATION SENSORS CORRECTLY FITTED

Next: p2216, !f2217

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p2258, !f2219

OBSERVATION PUMP RUNNING FOR OVERHEAT

ENSURE APPLIANCE IS

Next: p2259, f2260

LIMPET PUMP

Next: p2265, !f2266

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB

Next: p238, !f247

TEMPERATURE DIFFERENTIAL CH

BOILER CH THERMOSTAT

Next: p2267, ?2269, ?2271

TEMPERATURE DIFFERENTIAL DHW (OVERHEAT)

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p2293, !f2294

INSPECTION EXTERNAL BYPASS

Next: p2285, !f2286

OBSERVATION INTEGRAL TIMER

Next: p2273, f2274

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p2279, f2280

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE PRIMARY CIRCUIT WATER DRAINED

Next: p2287, !f2288

INSPECTION FILTER RETURN

BOILER DRAINED AND D

Next: p2289, !f2290

INSPECTION INTEGRAL BYPASS (RESTRICTED OR BLOCKED)

APPLIANCE DRAINED AND DISCHARGED

Next: !p2291, !f2292

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p2335, f2336

VOLTAGE DC RECTIFICATION PERMANENT

{GAINPCBACS}

Next: p231, f549

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p2331, !f2332

OBSERVATION FAN RUNNING

NO DEMANDS

Next: p2313, f2314

OBSERVATION SYSTEM PRESSURE

Next: p2305, !f2306

VOLTAGE DC FROM PRESSURE SENSOR

{GAINPCBACS}

Next: !p2307, f2308

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR X5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR

Next: !p2311, !f2312

VOLTAGE DC RECTIFICATION BURNER LIT

Next: !p232, f234

RESISTANCE HARNESS FAN DC

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X8 FROM THE PCB

Next: p2325, !f2326

VOLTAGE DC TO FAN AT PCB

{GAINPCBACS}
REMOVE FAN DC CONNECTOR (4 WIRE) AND MAKE SAFE

Next: p2321, !f2322

RESISTANCE HARNESS FAN DC

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X8 FROM THE PCB

Next: !p2323, !f2324

VOLTAGE DC PERMANENT TO FAN

Next: p2327, !f2328

VOLTAGE DC FROM FAN HALL SENSOR

Next: p2473, !f2330

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p2333, !f2334

OBSERVATION CONNECTOR X5 REMOVED (DISPLAY OPERATES?)

REMOVE CONNECTOR X5 FROM THE PCB AND MAKE SAFE

Next: p2345, f2340

RESISTANCE THERMISTOR AND HARNESS RETURN

REMOVE CONNECTOR X7 FROM THE PCB

Next: p2346, f2347

RESISTANCE THERMISTOR FLOW / STAT AND HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: p2350, f2351

RESISTANCE THERMISTOR AND HARNESS FLUE

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p2354, f2355

RESISTANCE HARNESS TIMER SECTION

REMOVE THE CONNECTOR FROM THE INTEGRAL TIMER

Next: !p2359, !f2360

RESISTANCE HARNESS TIMER SECTION

REMOVE THE CONNECTOR FROM THE INTEGRAL TIMER

Next: !p2362, !f2363

RESISTANCE HARNESS TIMER SECTION

REMOVE THE CONNECTOR FROM THE INTEGRAL TIMER

Next: !p2365, !f2366

RESISTANCE HARNESS TIMER SECTION

REMOVE THE CONNECTOR FROM THE INTEGRAL TIMER

Next: !p2368, !f2369

RESISTANCE HARNESS TIMER SECTION

REMOVE THE CONNECTOR FROM THE INTEGRAL TIMER

Next: !p2371, !f2372

RESISTANCE IGNITION CAP

Next: p1100, !f246

INSPECTION NOZZLE AIR GAS MIXING

REMOVE THE FAN FROM

Next: p2388, !f2389

INSPECTION FLUE

Next: p2390, !f2391

INSPECTION BURNER

REMOVE BURNER

Next: p2392, !f2393

INSPECTION INSULATION PADS

Next: p2394, !f2395

INSPECTION HEAT EXCHANGER

Next: !p2396, !f2397

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p2402, !f2400

INSPECTION IGNITION LEAD END

REMOVE THE CAP FROM THE SPARK ELECTRODE
UNSCREW IT ANTICLOCKWISE FROM THE IGNITION LEAD

Next: p226, !f244

INSPECTION FAN ASSEMBLY

Next: !p2405, !f2406

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR X5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR

Next: !p2432, !f2431

INSPECTION INSULATION PADS

Next: p1762, !f2437

OBSERVATION CHECK LOW WATER PROTECTION PARAMETER

Next: !p2443, !f2444

OBSERVATION FAN AND PUMP OVERRUN

Next: p2446, !f2447

OBSERVATION PRIMARY HEAT EXCHANGER TEMPERATURE - OVERHEAT

Next: !p2448, !f2449

RESISTANCE HARNESS FAN DC

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X8 FROM THE PCB

Next: p2463, !f2464

VOLTAGE DC PERMANENT TO FAN

Next: p2465, !f2466

VOLTAGE DC FROM FAN HALL SENSOR

Next: p2469, !f2468

VOLTAGE DC FAN SPEED CONTROL RETURN

Next: !p2470, !f2472

VOLTAGE DC FAN SPEED CONTROL RETURN

Next: !p2476, !f2475

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p250, !f264

INSPECTION INJECTOR

REMOVE THE INJECTOR FROM THE AIR / GAS MANIFOLD

Next: p1658, !f265

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p69, !f262

INSPECTION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY FROM THE HEAT EXCHANGER

Next: p1114, !f309

INSPECTION AIR IMPULSE TUBE

Next: p273, !f305

VOLTAGE DC TO GAS VALVE AT PCB

{GAINPCBACS}

Next: p274, f2162

RESISTANCE HARNESS GAS VALVE

REMOVE THE CONNECTOR

Next: p2159, !f304

PRESSURE FAN

REMOVE THE AIR IMPUL

Next: p270, ?285, ?287

INSPECTION CONDENSATE PIPE

Next: p289, !f442

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p290, !f297

INSPECTION FLUE

Next: p291, !f298

INSPECTION BURNER

REMOVE BURNER

Next: !p303, !f299

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p319, f320

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p326, !f327

OPERATION CH NOISY?

BOILER SET TO WINTER MODE (NO SUN SYMBOL IN DISPLAY)

Next: !p342, ?343, ?345

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE PRIMARY CIRCUIT WATER DRAINED

Next: !p1769, !f349

OBSERVATION INTEGRAL TIMER

Next: p352, f353

OBSERVATION BOILER RECOGNISES DEMAND (EXT CONTROLS LINKED OUT)

LINK OUT THE EXTERNA

Next: !p358, f359

INSPECTION EXTERNAL BYPASS

Next: p403, !f428

LIMPET PUMP

Next: p404, !f429

TEMPERATURE SECONDARY HEAT EXCHANGER

ENSURE THE SECONDARY

Next: p408, f409

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: p412, f413

VOLTAGE DC DIVERTER VALVE VARIATION

ATTACH BLACK CROCODILE CLIP TO A SUITABLE EARTH POINT

Next: !p426, !f427

INSPECTION FILTER RETURN

BOILER DRAINED AND D

Next: !p416, !f417

INSPECTION INTEGRAL BYPASS (STUCK OPEN)

APPLIANCE DRAINED AND DISCHARGED

Next: !p418, !f441

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR X9 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p424, !f425

VOLTAGE DC DIVERTER VALVE PERMANENT AT PCB

{GAINPCBACS}

Next: p432, ?433, ?435

VOLTAGE DC DIVERTER VALVE VARIATION

ATTACH BLACK CROCODILE CLIP TO A SUITABLE EARTH POINT

Next: !p439, !f440

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR X9 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p437, !f438

VOLTAGE DC TO FAN AT PCB

{GAINPCBACS}
REMOVE FAN DC CONNECTOR (4 WIRE) AND MAKE SAFE

Next: p479, !f480

RESISTANCE HARNESS FAN DC

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X8 FROM THE PCB

Next: !p481, !f482

RESISTANCE HARNESS FAN DC

REMOVE THE 4 WAY CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X8 FROM THE PCB

Next: p484, !f485

VOLTAGE DC PERMANENT TO FAN

Next: p486, !f487

VOLTAGE DC FROM FAN HALL SENSOR

Next: !p488, !f489

FAULT CODES (F BLOCKING CODES)

F CODES ARE BLOCKING

Next: !p501, !f502

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p511, f512

RESISTANCE THERMISTOR RETURN

REMOVE THE TWO SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: p517, !f518

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p519, !f520

OBSERVATION WHICH DEMAND IS SHOWING

Next: p523, f2373

OBSERVATION REMOVE EXTERNAL CONTROLS

REMOVE THE EXTERNAL

Next: p529, !f530

TEMPERATURE PRIMARY HEAT EXCHANGER

Next: p531, !f532

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: !p533, !f534

VOLTAGE WIRELESS CONTROL

{GAINPCBACS}

Next: !p564, !f565

OBSERVATION APPLIANCE RESET (BOILER RESPONDS)

ENSURE NO DEMANDS

Next: p609, f588

RESISTANCE FUSE FH1

REMOVE FUSE FH1 FROM ITS HOLDER

Next: p595, f596

RESISTANCE FUSE FH2

REMOVE FUSE FH2 FROM THE PCB

Next: p2339, f600

PCB DISPLAY FAULTY FURTHER INVESTIGATION?

TESTS SO FAR SHOW TH

Next: !p610, !f684

PRESSURE GAS INLET DROP

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p2120, ?269, ?271

INSPECTION CONDENSATE PIPE

Next: p248, !f263

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p230, !f235

RESISTANCE THERMISTOR FLOW / STAT

REMOVE THE CONNECTOR FROM THE FLOW THERMISTOR

Next: p325, !f443

VOLTAGE DC FROM PRESSURE SENSOR

{GAINPCBACS}

Next: !p753, f754

RESISTANCE HARNESS PRESSURE SENSOR

REMOVE CONNECTOR X5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE LOW PRESSURE SENSOR

Next: !p757, !f758

LIMPET PUMP

Next: p339, !f340

INSPECTION SUMP

REMOVE THE SUMP COVE

Next: p799, !f798

RESISTANCE RECTIFICATION LEAD AND ELECTRODE TO EARTH

REMOVE CONNECTOR X12 FROM THE PCB

Next: p803, f800

RESISTANCE IGNITION LEAD AND ELECTRODE TO EARTH

REMOVE THE IGNITION LEAD FROM THE SPARK GENERATOR

Next: !p804, f805

INSPECTION VALVES FLOW AND RETURN

Next: p402, !f430

RESISTANCE GAS VALVE AND HARNESS AND TO EARTH

REMOVE CONNECTOR X4 FROM THE PCB

Next: p869, f860

RESISTANCE FAN AND HARNESS AND TO EARTH (AC)

REMOVE CONNECTOR X4 FROM THE PCB

Next: p870, f872

RESISTANCE FAN AND HARNESS AND TO EARTH (DC)

REMOVE CONNECTOR X8 FROM THE PCB

Next: !p871, f873

System Information

  • Total Tests: 856
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control