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:

APPLIANCE APPEARS SATISFACTORY

Next: nff

CASE OFF

OUTER CASE REMOVA

Next: &1045, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &7, !f4

FAULT CODES

FAULT CODES

Next: &2591, !f8

OBSERVATION FAN RUNS WITH DEMAND

Next: &334, f2834

OPERATION CH

{SELHWCHON}
APPLIANCE THERMOSTAT SET TO MAX

Next: &357, ?251, ?257, ?2306, ?2322

DOES PUMP RUN ON CH DEMAND

Next: &2660, f2865

OPERATION DHW

Next: &nff, ?422, ?2328

OVERHEAT INVESTIGATION

NOT USED - HEADER FOR OVERHEAT INVESTIGATION

Next: &nff, f438

E20 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f585

E50 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f591

E119 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f598

E125 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f628

E160 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f721

FUSE FURTHER INVESTIGATION

NOT USED - HEADER FOR FUSE INVESTIGATION

Next: &nff, f806

E168 FAULT CODE

E168 FAULT CODE
T

Next: &nff, f1615

E156 FAULT CODE

Next: &nff, !f1022

POWER UP

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &1093, ?1465, ?1467

BOILER ENTERS STANDBY MODE

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &3, ?1094, ?1368

E164 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f1176

OBSERVATION DEMAND RECOGNISED

SELECTOR SWITCH TO DHW AND CH MODE
APPLIANCE THERMOSTAT SET TO MAX

Next: &105, f2592

BURNER IGNITES AND ESTABLISHES

{SELHWCHON}

Next: &248, ?2661, ?2663, ?2665

SF OR P CALIBRATION FUNCTION

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f2910

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f2914

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f2916

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2918

HEADER FOR QADAI RETURN THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2922

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2926

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2930

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2934

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2938

HEADER FOR QADAI FAN AC VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2942

HEADER FOR QADAI FAN AC RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2946

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2950

LOW INCOMING VOLTAGE

MAINS VOLTAGE LESS THAN 180VAC

Next: End

DC FAN SECTION FAULTY CAUSING CONTINUOUS FAN

HARNESS

Next: End

NO PERMANENT DC SUPPLY TO FAN

PCB

Next: End

NO PRESSURE E164

SYSTEM PRESSURE

Next: End

FAULTY/BLOCKED E164

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

WEAK OR SLOW E164

PUMP

Next: End

NOT RECOGNISING SPEED CONTROL 2

FAN ASSEMBLY

Next: End

BLOWN DUE TO FATIGUE

FUSE 3AMP

Next: End

BLOWN DUE TO FATIGUE

FUSE 2 AMP (LIVE)

Next: End

BLOWN DUE TO FATIGUE

FUSE 2 AMP (NEUTRAL)

Next: End

ERRATIC TEMPERATURE READING

SENSOR - BOILER - SPARE

Next: End

NO FAN SPEED CONTROL VOLTAGE FAULT CODE

PCB

Next: End

DC FAN SECTION FAULTY CASUING FAULT CODE 2

HARNESS

Next: End

NO PERMANENT VOLTAGE TO FAN E160

PCB

Next: End

NO FAN SPEED CONTROL VOLTAGE FAULT CODE 2

PCB

Next: End

SOLENOID CAUSING E168

GAS VALVE

Next: End

WEAK OR SLOW CAUSING POOR CH OPERATION

PUMP

Next: End

CASE REMOVAL

Z BLANKS

Next: End

OUT OF CALIBRATION 2

SENSOR - BOILER - SPARE

Next: End

RECONGINSING DEMAND WHEN SHOULDNT

PCB

Next: End

RECOGNISING DEMAND WHEN SHOULDNT 2

PCB

Next: End

OUT OF CALIBRATION

SENSOR - BOILER - SPARE

Next: End

OUT OF CALIBRATION 2

CLIP - NTC RETURN SENSOR

Next: End

OUT OF CALIBRATION

CLIP - NTC RETURN SENSOR

Next: End

OUT OF CALIBRATION 3

SENSOR - BOILER - SPARE

Next: End

PARTIALLY OR FULLY CLOSED

FLOW AND RETURN VALVES

Next: End

LOW OR NO CHARGE

EXPANSION VESSEL

Next: End

WEAK OR SLOW CAUSING POOR CIRCULATION

PUMP

Next: End

OPEN TOO MUCH LEADING TO NO CIRCULATION ROUND SYSTEM

Next: End

PASSING LEADING TO NO CIRCULATION ROUND SYSTEM

KIT - BY-PASS-CH

Next: End

RESTRICTED/BLOCKED PREVENTING SYSTEM CIRCULATION

TAP - ISOLATION - RETURN (FILTER)

Next: End

RESTRICTED/BLOCKED OVERHEAT

TAP - ISOLATION - RETURN (FILTER)

Next: End

CAUSING E168

SPARK GENERATOR

Next: End

E168 AC

FAN ASSEMBLY

Next: End

E168 DC

FAN ASSEMBLY

Next: End

CAUSING E168

SENSOR - BOILER - SPARE

Next: End

NOT RESETTING OVERHEAT

SWITCH - SELECTOR - 4 POSITION

Next: End

OPEN CIRCUIT OVERHEAT

THERMOSTAT - LIMIT

Next: End

WEAK OR SLOW CAUSING EARLY SHUT DOWN

PUMP

Next: End

TRIPPING EARLY ON CH OPERATION

THERMOSTAT - LIMIT

Next: End

RESTRICTED/BLOCKED E125

TAP - ISOLATION - RETURN (FILTER)

Next: End

CAUSING E168

THERMOSTAT - LIMIT

Next: End

CAUSING E168

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSURE E168

SYSTEM PRESSURE

Next: End

FAULTY/BLOCKED E168

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

SECTION FROM TERMINAL STRIP TO SELECTOR SWITCH

HARNESS - WIRING - 5 + 1 TERMINAL

Next: End

NO VOLTAGE TO EXTERNAL CONTROLS

Next: End

EXTERNAL CONTROLS SECTION TO PCB

Next: End

FAULTY OR MISSING

HARNESS X6 LINK

Next: End

NO POWER TO INTEGRAL TIMER

PCB

Next: End

INSUFFICIENT PREVENTING RECTIFICATION

GAS INLET PRESSURE

Next: End

BLOCKED PREVENTING BURNER ESTABLISHING

BODY CONDENSATE TRAP AND DRAIN

Next: End

NO RECTIFICATION VOLTAGE

PCB

Next: End

DETECTION LEAD SECTION FAULTY PREVENTING RECTIFICATION

HARNESS

Next: End

INSUFFICIENT CAUSING BAFFLING

GAS INLET PRESSURE

Next: End

RESTRICTED/BLOCKED OR SPLIT CAUSING BAFFLING

PIPE - PRESSURE SWITCH

Next: End

BLOCKED CAUSING BAFFLING

BODY CONDENSATE TRAP AND DRAIN

Next: End

RESTRICTED/BLOCKED OR INNER BREACHED CAUSING BAFFLING

FLUE

Next: End

RESTRICTED/BLOCKED CAUSING WRONG MIX AND BAFFLING

INJECTOR

Next: End

RESTRICTED/BLOCKED/DAMAGED CAUSING BAFFLING

BURNER

Next: End

FLUEWAYS RESTRICTED CAUSING BAFFLING

HEAT EXCHANGER

Next: End

RESTRICTED CAUSING WRONG MIX/BAFFLING

PLATE - ORIFICE

Next: End

RESTRITED BLOCKED OR SPLIT PREVENTING IGNITON

PIPE - PRESSURE SWITCH

Next: End

BLOCKED PREVENTING IGNITION

BODY CONDENSATE TRAP AND DRAIN

Next: End

SPARK GENERATOR HARNESS SECTION FAULTY PREVENTING SPARKING

HARNESS HIGH VOLTAGE

Next: End

NO OR LOW SUPPLY TO SPARK GENERATOR

PCB

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

FAULTY SOLENOID PREVENTING OPENING

GAS VALVE

Next: End

RESTRICTED/BLOCKED PREVENING INLET DROP

FLUE

Next: End

RESTRICTED/BLOCKED PREVENING GAS INLET DROP

INJECTOR

Next: End

RESTRICTED/BLOCKED NOT IGNITING

FAN - PRESSURE SENSING VENTURI

Next: End

RESTRICTED CAUSING NO DROP

PLATE - ORIFICE

Next: End

RESTRICTED/BLOCKED PREVENITNG IGNITION

FLUE

Next: End

RESTRICTED/BLOCKED PREVENTING IGNITION

INJECTOR

Next: End

RESTRICTED/BLOCKED NOT IGNITING 2

FAN - PRESSURE SENSING VENTURI

Next: End

RESTRICTED CAUSING WRONG MIX/NO IGNITION

PLATE - ORIFICE

Next: End

RESTRICTED REDUCING OUTPUT

INJECTOR

Next: End

RESTRICTED CAUSING LOW OUTPUT

FLUE

Next: End

RESTRICTED LOWERING OUTPUT

BURNER

Next: End

FLUEWAYS RESTRICTED LOWERING OUTPUT

HEAT EXCHANGER

Next: End

RESTRICTED CASUING LOW OUTPUT

PLATE - ORIFICE

Next: End

CAUSING E168

UNIT - IGNITION AND IONISATION - SPARE

Next: End

SHORTED

SPARK GENERATOR

Next: End

WEAK SUPPLY TO SPARK GENERATOR

PCB

Next: End

FAULTY/MISALIGNED

SPINDLE / KNOB ALIGNMENT

Next: End

OUT OF CALIBRATION PREVENTING DEMAND

SENSOR - BOILER - SPARE

Next: End

OUT OF CALIBRATION PREVENTING DEMAND

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSURE

SYSTEM PRESSURE

Next: End

FAULTY/BLOCKED

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

OPEN CIRCUIT PREVENTING FAN

THERMOSTAT - LIMIT

Next: End

FAN SECTION FAULT PREVENTING FAN FROM RUNNING

HARNESS HIGH VOLTAGE

Next: End

NO AC VOLTAGE TO FAN PREVENTING FAN RUNNING

PCB

Next: End

DC SECTION TO FAN FAULTY PREVENTING FAN RUNNING

HARNESS

Next: End

NO PERMANENT VOLTAGE TO FAN PREVENTING FAN RUNNING

PCB

Next: End

NO DC DEMAND VOLTAGE PREVENTING FAN RUNNING

PCB

Next: End

FAULTY/MISALIGNED 2

SPINDLE / KNOB ALIGNMENT

Next: End

OBSERVATION PUMP RUNS

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB OVERHEAT

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP OVERHEAT

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS OVERHEAT

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS E125

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E125

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E125

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS E125

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS E164

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E164

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E164

HARNESS HIGH VOLTAGE

Next: End

OBSERVATION PUMP RUNS E164

RELAY - PCB

Next: End

PUMP SECTION SHORTED BLOWING FUSE

HARNESS HIGH VOLTAGE

Next: End

PUMP SECTION FAULTY CAUSING E168

HARNESS HIGH VOLTAGE

Next: End

STUCK IN CALIBRATION MODE

PCB

Next: End

BLANK FOR LITE DIAGNOSTIC

Z BLANKS

Next: End

BLANK FOR QADAI

Z BLANKS

Next: End

QADAI

SENSOR - BOILER - SPARE

Next: End

QADAI

CLIP - NTC RETURN SENSOR

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO POWER TO GAS VALVE

PCB

Next: End

QADAI

SPARK GENERATOR

Next: End

QADAI NO POWER TO PUMP

RELAY - PCB

Next: End

QADAI NO POWER TO FAN AC

PCB

Next: End

QADAI AC

FAN ASSEMBLY

Next: End

QADAI

PUMP

Next: End

TYPE OF DIAGNOSTIC PROCEDRE

Z BLANKS

Next: End

WEAK OR SLOW OVERHEAT

PUMP

Next: End

OUT OF CALIBRATION OVERHEAT

CLIP - NTC RETURN SENSOR

Next: End

OUT OF CALIBRATION OVERHEAT

SENSOR - BOILER - SPARE

Next: End

INSUFFICIENT CAUSING LOW OUTPUT

GAS INLET PRESSURE

Next: End

OUT OF RANGE

SENSOR - BOILER - SPARE

Next: End

OUT OF RANGE

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSURE E119

SYSTEM PRESSURE

Next: End

FAULTY/BLOCKED E119

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

WEAK OR SLOW E125

PUMP

Next: End

OUT OF CALIBRATION E125

SENSOR - BOILER - SPARE

Next: End

OUT OF CALIBRATION E125

CLIP - NTC RETURN SENSOR

Next: End

NOT RESETTING E125

SWITCH - SELECTOR - 4 POSITION

Next: End

FAN SECTION FAULTY CAUSING FAULT CODE

HARNESS HIGH VOLTAGE

Next: End

NO AC VOLTAGE TO FAN CAUSING FAULT CODE

PCB

Next: End

FAN HARNESS DC SECTION FAULT CODE

HARNESS

Next: End

NO DC SUPPLY TO FAN E160

PCB

Next: End

FAULT CODES

Z BLANKS

Next: End

NO HALL SENSOR SIGNAL

FAN ASSEMBLY

Next: End

SOLENOID SHORTED

GAS VALVE

Next: End

DC SECTION SHORTED

FAN ASSEMBLY

Next: End

AC SECTION SHORTED

FAN ASSEMBLY

Next: End

WATER PRESSURE SENSOR SECTION FAULTY CAUSING FAULT CODE

HARNESS

Next: End

STUCK IN E164

PCB

Next: End

WATER PRESSURE SENSOR SECTION FAULTTY CAUSING FAULT CODE 2

HARNESS

Next: End

NO FAN SPEED CONTROL VOLTAGE

PCB

Next: End

DHW

FROST PROTECTION

Next: End

NO MAINS POWER

Next: End

FUSE FURTHER INVESTIGATION F1

Z BLANKS

Next: End

FUSE FURTHER INVESTIGATION F2

Z BLANKS

Next: End

FUSE FURTHER INVESTIGATION F3

Z BLANKS

Next: End

ERRATIC TEMPERATURE DISPLAY

PCB

Next: End

PRIMARY SENSOR SECTION FAULTY

HARNESS

Next: End

NOT RECOGNISING SPEED CONTROL

FAN ASSEMBLY

Next: End

NOT RUNNING WITH DEMAND 2

FAN ASSEMBLY

Next: End

GAS VALVE SECTION FAULTY CAUSING E168

HARNESS HIGH VOLTAGE

Next: End

VOLTAGE PRESENT WHEN NO DEMAND

Next: End

GIVING DEMAND WHEN SHOULDNT

KIT - ELECTRO/MECHANICAL

Next: End

NO DHW DEMAND VOLTAGE

Next: End

OPERATION DHW

Next: End

BLOCKAGE - RESTRICTION - AIR

Next: End

SYSTEM FAULT OVERHEAT

Next: End

OVERHEATED NO REASON

TEMPERATURE OVERHEAT

Next: End

NOT CONTROLING MAXIMUM TEMPERATURE

PCB

Next: End

TRIPPING EARLY OVERHEAT

THERMOSTAT - LIMIT

Next: End

SPARK GENERATOR SECTION FAULTY CAUSING E168

HARNESS HIGH VOLTAGE

Next: End

FAN SECTION FAULTY CASUING E168

HARNESS HIGH VOLTAGE

Next: End

DC FAN SECTION CAUSING E168

HARNESS

Next: End

PRIMARY SENSOR SECTION FAULTY CAUSING E168

HARNESS

Next: End

STUCK IN OVERHEAT FAULT CODE

PCB

Next: End

OH STAT SECTION FAULTY OVERHEAT FAULT CODE

HARNESS

Next: End

NO FAULT FOUND

BOILER LOCKOUT

Next: End

RESTRICTEDE125

HEAT EXCHANGER

Next: End

OH STAT SECTION FAULTY CASUING E168

HARNESS

Next: End

RETURN SENSOR SECTION CASUING E168

HARNESS

Next: End

WATER PRESSURE SENSOR SECTION FAULTY CAUSING E168

HARNESS

Next: End

TEMPERATURE CONTROL FAULTY SHUTTING DOWN PREMAUTRELY

PCB

Next: End

SELECTOR SWITCH TO PCB SECTION FAULTY

HARNESS - WIRING - 5 + 1 TERMINAL

Next: End

NO POWER FROM SELECTOR SWITCH TO PCB

SWITCH - SELECTOR - 4 POSITION

Next: End

NO DISPLAY

PCB

Next: End

NO CH DEMAND VOLTAGE

Next: End

SELECTOR SWITCH TO EXTERNAL CONTROLS SECTION FAULTY

Next: End

NOT RECOGNISING DEMAND

PCB

Next: End

NOT RECOGNISING DEMAND 2

PCB

Next: End

NOT GIVING DEMAND WHEN SHOULD

KIT - ELECTRO/MECHANICAL

Next: End

NOT RECOGNISING RECTIFICATION

PCB

Next: End

DETECTION ELECTRODE PREVENTING RECTIFICATION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

RESTRICTED OR BLOCKED CAUSING BAFFLING

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED OR BLOCKED CAUSING BAFFLING

PLENUM - AIR INTAKE

Next: End

WRONG MIX CASUING BAFFLING

GAS VALVE

Next: End

SPARK GAP INCORRECT OR OPEN CIRCUIT PREVENTING SPARKING

UNIT - IGNITION AND IONISATION - SPARE

Next: End

OPEN CIRCUIT OR POOR CONDITION PREVENTING SPARKING

SPARK PLUG AND HT LEAD

Next: End

INSUFFICIENT PREVENTING IGNITON

GAS INLET PRESSURE

Next: End

NO VOLTAGE TO GAS VALVE

PCB

Next: End

GAS VALVE HARNESS DAMAGED PCB

PCB AND GAS VALVE HARNESS

Next: End

GAS VALVE SECTION FAULTY PREVENTING INLET DROP

HARNESS HIGH VOLTAGE

Next: End

RESTRICTED OR BLOCKED CAUSING NO INLET DROP

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED OR BLOCKED NO IGNITION 2

PLENUM - AIR INTAKE

Next: End

FLUEWAYS RESTRICTED PREVETING INLET PRESSURE DROP

HEAT EXCHANGER

Next: End

RESTRICTED/BLOCKED CAUSING NO INLET DROP

BURNER

Next: End

SOLENOID OK BUT NOT OPENING

GAS VALVE

Next: End

RESTRICTED OR BLOCKED ALLOWING DROP BUT PREVENTING IGNITION

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED OR BLOCKED NO IGNITION

PLENUM - AIR INTAKE

Next: End

SPARK GAP INCORRECT PREVENTING IGNITION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

OPEN CIRCUIT OR POOR CONDITION PREVENTING IGNITON

SPARK PLUG AND HT LEAD

Next: End

FLUEWAYS RESTRICTED PREVENTING IGNITON

HEAT EXCHANGER

Next: End

SPARK GAP FROM BURNER INCORRECT PREVENTING IGNITION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

RESTRICTED/BLOCKED/DAMAGED PREVENTING IGNITION

BURNER

Next: End

OPENING BUT INCORRECT MIX PREVENTING IGNITION

GAS VALVE

Next: End

RESTRICTED LOWERING OUTPUT

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED LOWERING OUTPUT

PLENUM - AIR INTAKE

Next: End

TEMPERATURE CONTROL FAULTY CAUSING INSUFFICIENT TEMPERATURE

PCB

Next: End

STUCK IN E168

PCB

Next: End

PCB FUSE BLOWING

FUSE GONE PCB

Next: End

SPARK GENERATOR SECTION SHORTED

HARNESS HIGH VOLTAGE

Next: End

BLOCKED

RETURN PIPE ASSEMBLY (EXPANSION VESSEL PIPE)

Next: End

NOT MAKING SPARKS

SPARK GENERATOR

Next: End

PRIMARY SENSOR SECTION FAULTY PREVENTING DEMAND

HARNESS

Next: End

RETURN SENSOR SECTION FAULTY PREVENTING DEMAND

HARNESS

Next: End

WATER PRESSURE SWITCH SECTION FAULTY PREVENTING DEMAND

HARNESS

Next: End

OH STAT SECTION FAULT PREVENTING DEMAND

HARNESS

Next: End

NOT RUNNING WITH DEMAND

FAN ASSEMBLY

Next: End

OBSERVATION PUMP RUNS

PUMP

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PUMP

Next: End

OBSERVATION PUMP RUNS E125

PUMP

Next: End

OBSERVATION PUMP RUNS E164

PUMP

Next: End

SHORTED BLOWING FUSE

PUMP

Next: End

CAUSING E168

PUMP

Next: End

NORMAL OPERATION

CALIBRATION FUNCTION

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

SENSOR TEMP RETURN

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

PCB POWER TO GAS VALVE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

PCB POWER TO PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO FAN AC

RESULT AS EXPECTED

Next: End

FAN AC

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

PRIMARY SENSOR SECTION FAULTY CAUSING FAULT CODE

HARNESS

Next: End

STUCK IN E20 FAULT CODE

PCB

Next: End

RETURN SENSOR SECTION CASUING FAULT CODE

HARNESS

Next: End

STUCK IN E50

PCB

Next: End

STUCK IN E119

PCB

Next: End

STUCK IN E125

PCB

Next: End

DC SECTION SHORTED BLOWING FUSE

HARNESS

Next: End

GAS VALVE SECTION SHORTED BLOWING FUSE

HARNESS HIGH VOLTAGE

Next: End

FAN SECTION SHORTED BLOWING FUSE

HARNESS HIGH VOLTAGE

Next: End

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1095

DHW / CH DEMAND LED ILLUMINATED

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1430

DISPLAY DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM POWER UP

Next: p1469

DISPLAY ILLUMINATES BUT TEMPERATURE DISPLAYED ERRATIC

CHARACTERISTIC TEST FROM POWER UP

Next: p1516

BOILER REACHES TEMPERATURE BUT RADIATORS REMAIN COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2307

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2323

BOILER RESPONDS TO DHW DEMAND BUT OPERATION UNSATISFACTORY

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p2329

BOILER EXCEEDS MAXIMUM TEMPERATURE AND DOES NOT SHUT DOWN

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2354

BOILER LOCKS OUT ON OVERHEAT BEFORE REACHING MAXIMUM TEMPERATURE

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2356

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2807

BOILER SHUTS DOWN BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2494

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p2662

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p2664

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p2666

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2688

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2690

ELECTRODE UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2707

IGNITION LEAD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2709

GAS INLET PRESSURE UNSATISFACTORY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p2717

GAS INLET PRESSURE OK BUT NO DROP SEEN

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p2719

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2733

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2735

HEAT EXCHANGER FLUEWAYS RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

Next: !p2745

BURNER RESTRICTED AND/OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

Next: !p2747

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2753

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2755

ELECTRODE UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2763

IGNITION LEADS UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2765

HEAT EXCHANGER FLUEWAYS RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

Next: !p2771

IGNITION ELECTRODES UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2773

BURNER RESTRICTED AND/OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

Next: !p2775

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2781

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2783

BOILER DOES NOT RESPOND TO DHW DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p2327

08/07/2022 16:33:48 2207_1_50_1 20/10/2022 11:10:01

26/08/2022 15:30:41

Next: End

SYSTEM PRESSURE CHECK

Next: p1183, !f1178

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p1181, !f1182

RESISTANCE FUSE F1 (FUSED SPUR)

Next: !p1472, f1473

FUSE FURTHER INVESTIGATION F1

Next: !p1474, !f1475

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE CONTROL BOX COVER
REMOVE THE FUSE AND HOLDER FROM THE LIVE (BROWN)

Next: p1478, f1479

FUSE FURTHER INVESTIGATION F2

Next: !p1480, !f1481

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p1519, !f1520

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1616, f1617

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2908, !f2907

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1622, !f1623

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p2111, !f2112

VOLTAGE FROM SWITCH LIVE

{SELHWCHON}
NO DEMANDS FOR CH
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2115, !f2116

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2349, !f2350

RESISTANCE SPARK GENERATOR

REMOVE THE CONNECTOR FROM THE SPARK GENERATOR

Next: !p2360, !f2361

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2364, !f2365

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p2368, !f2369

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p2372, !f2373

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p2451, !f2452

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2454, !f2455

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2555, !f2556

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2560, !f2561

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2564, !f2565

SYSTEM PRESSURE CHECK

Next: p2568, !f2569

VOLTAGE SELECTOR SWITCH

{SELHWCHON}

Next: !p2581, f2582

VOLTAGE SELECTOR SWITCH INPUT

Next: !p2583, !f2584

VOLTAGE TERMINAL BLOCK FROM EXTERNAL CONTROLS

{SELHWCHON}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: p2593, f2594

VOLTAGE TERMINAL BLOCK INTO EXTERNAL CONTROLS

{SELHWCHON}

Next: !p2595, f2596

RESISTANCE SELECTOR SWITCH (EXTERNAL CONTROLS)

DISCONNECT TOP TWO LEFT LEADS FROM SELECTOR SWITCH (BROWN AND BLACK)

Next: !p2597, !f2598

LINK FITTED ON PCB PLUG X9

REMOVE THE COVER FROM THE PCB AND LOCATE PLUG X9
(RIGHT HAND SIDE OF THE PCB)

Next: !p2603, !f2604

VOLTAGE TO INTEGRAL TIMER

{SELHWCHON}

Next: !p2607, !f2608

RESISTANCE DETECTION LEAD

DISCONNECT INLINE CO

Next: !p2675, !f2676

INSPECTION IGNITION ELECTRODES & LEADS

REMOVED ELECTRODE ASSEMBLY
DISCONNECT IGNITION LEADS FROM SPARK GENERATOR, NOTE CONNECTIONS

Next: p2705, ?2706, ?2708

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: !p2722, f2723

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2724, !f2725

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2728, !f2729

RESISTANCE SPARK GENERATOR

REMOVE THE CONNECTOR FROM THE SPARK GENERATOR

Next: !p2801, !f2802

OPERATION CH CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: p2835, !f2864

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p2838, !f2839

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2842, !f2843

SYSTEM PRESSURE CHECK

Next: p2846, !f2847

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2852, !f2853

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2866, !f2867

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2875, !f2876

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2884, !f2885

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2893, !f2894

OBSERVATION CAN CALIBRATION FUNCTION BE DISABLED

Next: !p2911, !f2912

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p2919, !f2920

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2923, !f2924

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2927, !f2928

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HEATING AND HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2931, !f2932

RESISTANCE SPARK GENERATOR

REMOVE THE CONNECTOR FROM THE SPARK GENERATOR

Next: !p2935, !f2936

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2939, !f2940

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2943, !f2944

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2947, !f2948

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: !p2951, !f2952

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2424, f2453

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p589, f586

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p587, !f588

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p595, f592

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p593, !f594

SYSTEM PRESSURE CHECK

Next: p606, !f600

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p1001, !f614

BOILER RESET

Next: p642, f655

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p656, !f657

IS FAN RUNNING

{SELHWCHON}

Next: p722, f723

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p791, !f792

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p807, f808

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p831, !f810

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2906, !f2905

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p830, !f818

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p896, !f897

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1114, !f1115

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1116, !f1117

VOLTAGE DC FAN SPEED ON START UP

Next: !p1306, !f1307

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p1179, f1180

DOES PUMP RUN ON CH DEMAND

Next: p1189, f2892

PUMP LIMPET TEST

Next: p1177, !f1201

IS BOILER TEMP LOW

Next: !p1431, f2110

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p1470, f1471

VOLTAGE AT PCB MAINS

REMOVE CONTROL BOX COVER

Next: p2578, f1477

FUSE FURTHER INVESTIGATION F3

Next: !p1482, !f1483

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p1517, f1518

VOLTAGE DC PCB SPEED REQUEST

Next: !p1525, !f1526

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1552, !f1553

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1554, !f1555

VOLTAGE DC PCB SPEED REQUEST

Next: !p1556, !f1557

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p2357, f1621

PUMP LIMPET TEST

Next: p2249, !f1753

IS INTEGRAL TIMER FITTED

Next: p2113, f2114

IS VOLTAGE PRESENT FROM INTEGRAL TIMER

{SELHWCHON}
GAIN

Next: !p2117, !f2118

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p2250, !f2251

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2778, !f2253

INSPECTION FLOW AND RETURN VALVES

Next: p2330, !f2309

EXPANSION VESSEL PRESSURE

BOILER DISCHARGED

Next: !p2803, !f2325

PUMP LIMPET TEST

Next: p2332, !f2331

EXTERNAL BYPASS

Next: p2333, !f2334

AUTO BYPASS VALVE

EXTERNAL CONTROLS CA

Next: p2335, !f2336

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2337, !f2338

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
APPLI

Next: p2347, f2348

CH TEST OVERHEAT

{SELHWCHON}
APPLI

Next: !p2351, ?2353, ?2355

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p2358, f2359

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p2362, f2363

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p2366, f2367

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2557, f2371

BOILER RESET

Next: p439, f2448

PUMP LIMPET TEST

Next: p258, !f2500

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: !p2577, !f2503

GAS INLET PRESSURE

{SELHWCHON}
APPLI

Next: p1751, !f537

CH TEST LOCKOUT

{SELHWCHON}
APPLI

Next: !p2553, f2554

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2558, f2559

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2562, f2563

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2795, f2567

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p2570, !f2571

VOLTAGE MAINS IN AT PCB

Next: !p2590, f2580

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p259, !f2285

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2501, !f2284

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p2599, !f2600

IS INTEGRAL TIMER FITTED

Next: p2601, f2602

VOLTAGE FROM INTEGRAL TIMER

{SELHWCHON}

Next: !p2605, f2606

INSPECTION COMPENSATION TUBE

Next: p2699, !f2700

GAS INLET PRESSURE

{SELHWCHON}
APPLI

Next: p2677, !f2678

GAS INLET PRESSURE

{SELHWCHON}
APPLI

Next: p2667, !f2668

INSPECTION CONDENSATE PIPE

Next: p2669, !f2670

VOLTAGE RECTIFICATION ON PCB

{SELHWCHON}
REMOVE THE FLAME SENSE LEAD FROM TERMINAL X501

Next: p2671, !f2672

FLAME SENSE VOLTAGE AT PCB

{SELHWCHON}

Next: !p2673, f2674

INSPECTION COMPENSATION TUBE

Next: p2679, !f2680

INSPECTION CONDENSATE PIPE

Next: p2681, !f2682

INSPECTION FLUE

Next: p2683, !f2684

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2685, ?2687, ?2689

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2691, !f2692

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2693, !f2694

INSPECTION HEAT EXCHANGER

Next: p2695, !f2696

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2697, !f2698

INSPECTION CONDENSATE PIPE

Next: p2701, !f2702

OBSERVATION SPARKING OCCURS

REMOVE THE REARMOST

Next: p2703, f2704

PRESSURE GAS INLET AND DROP

{SELHWCHON}
SET D

Next: p2714, ?2716, ?2718

RESISTANCE SPARK GENERATOR HARNESS

REMOVE CONNECTOR FROM SPARK GENERATOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2710, !f2711

VOLTAGE SPARK GENERATOR

{SELHWCHON}
GAIN

Next: p2804, !f2713

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2750, ?2752, ?2754

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HEATING AND HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2720, f2721

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p2726, f2727

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2730, ?2732, ?2734

INSPECTION FLUE

Next: p2736, !f2737

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2738, !f2739

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: p2740, !f2741

INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

REMOVE BURNER ASSEMBLY FROM BOILER

Next: p2742, ?2744, ?2746

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2748, !f2749

INSPECTION FLUE

Next: p2756, !f2757

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2758, !f2759

INSPECTION IGNITION ELECTRODES & LEADS

REMOVED ELECTRODE ASSEMBLY
DISCONNECT IGNITION LEADS FROM SPARK GENERATOR, NOTE CONNECTIONS

Next: p2760, ?2762, ?2764

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: p2766, !f2767

INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

REMOVE BURNER DOOR ASSEMBLY

Next: p2768, ?2770, ?2772, ?2774

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2776, !f2777

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2779, ?2780, ?2782

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2784, !f2785

INSPECTION FLUE

Next: p2786, !f2787

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2788, !f2789

INSPECTION HEAT EXCHANGER

Next: p2790, !f2791

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2792, !f2793

INSPECTION ELECTRODES

REMOVE THE ELECTRODE ASSEMBLY FROM THE BOILER

Next: !p2796, !f2797

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p2799, f2800

VOLTAGE SPARK GENERATOR WITH LEAD

{SELHWCHON}
GAIN

Next: !p2805, !f2806

OPERATION CH CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: p252, !f2833

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2836, f2837

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2840, f2841

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2844, f2845

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2850, f2851

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p2848, !f2849

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2854, !f2855

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2856, !f2857

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p2858, !f2859

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2860, !f2861

VOLTAGE DC PCB SPEED REQUEST

Next: !p2862, !f2863

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2868, !f2869

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2870, !f2871

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2872, !f2873

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2877, !f2878

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2879, !f2880

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2881, !f2882

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2886, !f2887

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2888, !f2889

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2890, !f2891

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2895, !f2896

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2897, !f2898

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2899, !f2900

DOES PUMP RUN ON CH DEMAND

Next: p443, f2874

PUMP LIMPET TEST

Next: p447, !f448

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p449, !f529

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2346, !f528

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p611, f612

DOES PUMP RUN ON CH DEMAND

Next: p643, f2883

PUMP LIMPET TEST

Next: p649, !f650

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p651, !f652

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2552, !f654

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p797, !f795

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1551, !f794

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p798, !f799

VOLTAGE DC FROM FAN

{SELHWCHON}

Next: p1524, !f804

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p811, f812

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p815, f816

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p2798, f820

System Information

Total Tests: 524

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control