XSol Diagnostic System

POTTERTON KINGFISHER

GLOBALLY REPLACED

Next: &7, *

NO FAULT FOUND

Next: nff

DHW OPERATION

EXTERNAL CONTROL CALLING FOR HEAT

Next: &606, ?47, ?49, ?51, ?55, ?267

SYSTEM PRESSURE RISE

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: &1, !f59

CH OPERATION

EXTERNAL CONTROLS CALLING FOR HEAT

Next: &2, ?37, ?39, ?41, ?43, ?60

FAN RUNS CH DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: &710, f11

POTTERTON KINGFISHER

{ISOLATEMAINSPOWER}<

Next: &5, !f8

OPERATION PUMP OVERRUN

GAIN ACCESS TO SYSTEM PUMP
ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE FROM THE APPLIANCE

Next: &nff, !f611

BURNER PRESSURE TABLE

Next: &nff, !f613

OBSERVATION PILOT AND BURNER IGNITES

EXTERNAL CONTROL CALLING FOR HEAT

Next: &3, ?711, ?713, ?717, ?796

PUMP 1

MAIN PCB

Next: End

FAULT DETECTED BY LIMPET CH DEMAND 1

PUMP

Next: End

FAULT DETECTED BY LIMPET CH DEMAND 2

PUMP

Next: End

PUMP 2

MAIN PCB

Next: End

FAULT OPEN

Next: End

TEMPERATURE TOO LOW 1

Next: End

RESISTANCE TOO LOW 1

TEMPERATURE SENSOR

Next: End

LOW PRESSURE 1

GAS SUPPLY

Next: End

DOES THE PUMP RUN

LINK

Next: o234-p42, *

PUMP DHW DEMAND 1

MAIN PCB

Next: End

FAULT DETECTED BY LIMPET DHW DEMAND 1

PUMP

Next: End

FAULT OPEN DHW DEMAND

Next: End

LOW PRESSURE 2

GAS SUPPLY

Next: End

EFFICIENCY 2

BURNER INJECTOR

Next: End

EFFICIENCY 1

BURNER INJECTOR

Next: End

DOES THE PUMP RUN DHW DEMAND

LINK

Next: o276-p52, *

FAULT CLOSED

Next: End

OUTLET PRESSURE HIGH 1

GAS VALVE

Next: End

OPEN CIRCUIT CH DEMAND

TEMPERATURE SENSOR

Next: End

DHW TEMPERATURE SET TOO LOW 2

Next: End

TEMPERATURE TOO LOW 2

Next: End

RESISTANCE TOO LOW 2

TEMPERATURE SENSOR

Next: End

PREMATURE SHUTDOWN 1

OVERHEAT THERMOSTAT

Next: End

DHW TEMPERATURE SET TOO LOW 1

Next: End

RESISTANCE TOO LOW 3

TEMPERATURE SENSOR

Next: End

PREMATURE SHUTDOWN 2

OVERHEAT THERMOSTAT

Next: End

RESET SWITCH

DISPLAY PCB

Next: End

FAULT

HARNESS MAIN

Next: End

FAULT 2

POTENTIOMETER WIRING HARNESS ASSEMBLY

Next: End

OVERHEAT

POTENTIOMETER WIRING HARNESS ASSEMBLY

Next: End

FAULT

EXPANSION VESSEL

Next: End

PUMP OVERRUN FAULTY

MAIN PCB

Next: End

BURNER PRESSURE TABLE

Z REDIRECT

Next: End

TTB

Next: End

OPEN CIRCUIT

OVERHEAT THERMOSTAT

Next: End

SHORT CIRCUIT

TEMPERATURE SENSOR

Next: End

BLOCKED

AIR PRESSURE SWITCH TUBES TO FAN

Next: End

BLOCKED 1

VENTURI

Next: End

FAULT 1

POTENTIOMETER WIRING HARNESS ASSEMBLY

Next: End

FAULT

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

BLOCKED 2

AIR PRESSURE SWITCH TUBES TO FAN

Next: End

BLOCKED 3

VENTURI

Next: End

BLOWN

FUSE F1

Next: End

OPEN CIRCUIT NO TTB

OVERHEAT THERMOSTAT

Next: End

SHORT CIRCUIT NO TTB

TEMPERATURE SENSOR

Next: End

BLOCKED NO TTB

AIR PRESSURE SWITCH TUBES TO FAN

Next: End

BLOCKED 1 NO TTB

VENTURI

Next: End

FAULT 1 NO TTB

POTENTIOMETER WIRING HARNESS ASSEMBLY

Next: End

FAULT NO TTB

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

BLOCKED 2 NO TTB

AIR PRESSURE SWITCH TUBES TO FAN

Next: End

BLOCKED 3 NO TTB

VENTURI

Next: End

BLOWN NO TTB

FUSE F1

Next: End

INLET PRESSURE 3

GAS SUPPLY

Next: End

BLOCKED

BURNER INJECTOR

Next: End

GAS VALVE PILOT 1

MAIN PCB

Next: End

PILOT ELECTRICAL

GAS VALVE

Next: End

INLET PRESSURE 1

GAS SUPPLY

Next: End

GAP

SPARK ELECTRODE FLAME SENSE

Next: End

BLOCKED 1

PILOT INJECTOR

Next: End

BLOCKED 1

PILOT PIPE

Next: End

GAS VALVE MAIN

MAIN PCB

Next: End

MAIN ELECTRICAL

GAS VALVE

Next: End

OPEN OR BLOCKED

AIR PRESSURE SWITCH TUBES TO FAN

Next: End

BLOCKED 2

VENTURI

Next: End

BLOCKED

FLUE

Next: End

NO SPARKING

SPARK ELECTRODE FLAME SENSE

Next: End

FAULT 2

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

INLET PRESSURE 2

GAS SUPPLY

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL CHECKS

Next: End

BLOCKED 1

PILOT BURNER

Next: End

OUTLET PRESSURE LOW 1

GAS VALVE

Next: End

INTAKE BLOCKED

FLUE

Next: End

BLOCKED

BURNER

Next: End

BLOCKED 2

PILOT INJECTOR

Next: End

BLOCKED 2

PILOT PIPE

Next: End

FLAME SENSE

SPARK ELECTRODE FLAME SENSE

Next: End

BLOWN

MAINS FUSE

Next: End

NO DEMAND

Next: End

BLOWN

FUSE F2

Next: End

FAULT CH DEMAND 1

PUMP

Next: End

FAULT CH DEMAND 2

PUMP

Next: End

FAULT RADIATORS COOL CH DEMAND

SYSTEM

Next: End

OUTLET PRESSURE LOW 2

GAS VALVE

Next: End

EFFICIENCY 1

HEAT EXCHANGER

Next: End

FAULT DHW DEMAND 1

PUMP

Next: End

FAULT RADIATORS COOL DHW DEMAND

SYSTEM

Next: End

OUTLET PRESSURE LOW 3

GAS VALVE

Next: End

EFFICIENCY 2

HEAT EXCHANGER

Next: End

DHW DEMAND FAULT 1

Next: End

PREMATURE SHUTDOWN CH DEMAND

MAIN PCB

Next: End

PREMATURE SHUTDOWN DHW DEMAND

MAIN PCB

Next: End

ON/OFF SWITCH OR MAINS VOLTAGE TO PUMP

MAIN PCB

Next: End

FAULT DHW DEMAND

SYSTEM

Next: End

FAULT 5

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

FAULT 1

HARNESS FACIA CONNECTION

Next: End

OVERHEAT LOCKOUT

OVERHEAT THERMOSTAT

Next: End

KETTLING CH DEMAND

HEAT EXCHANGER

Next: End

OVERHEAT

KETTLING AND/OR OVERHEAT

Next: End

OVERHEAT

MAIN PCB

Next: End

DHW DEMAND FAULT 2

Next: End

OVERHEAT

HARNESS FACIA CONNECTION

Next: End

FAULT 3

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

FAULT 4

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

FAILED N/O OPEN

AIR PRESSURE SWITCH

Next: End

FAULT 2

HARNESS FACIA CONNECTION

Next: End

FAN 2

MAIN PCB

Next: End

FAILED N/O OPEN 2

AIR PRESSURE SWITCH

Next: End

FAN

MAIN PCB

Next: End

FAULT 3 NO TTB

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

FAULT 4 NO TTB

HARNESS LIMIT THERMOSTAT AIR PRESSURE SWITCH

Next: End

FAILED N/O OPEN NO TTB

AIR PRESSURE SWITCH

Next: End

FAULT 2 NO TTB

HARNESS FACIA CONNECTION

Next: End

FAN 2 NO TTB

MAIN PCB

Next: End

FAILED N/O OPEN 2 NO TTB

AIR PRESSURE SWITCH

Next: End

FAN NO TTB

MAIN PCB

Next: End

PILOT

HARNESS MAIN

Next: End

PILOT MECHANICAL

GAS VALVE

Next: End

MAIN MECHANICAL

GAS VALVE

Next: End

MAIN

HARNESS MAIN

Next: End

FAILED N/O CLOSED

AIR PRESSURE SWITCH

Next: End

SPARK GENERATOR

MAIN PCB

Next: End

GAS VALVE PILOT 2

MAIN PCB

Next: End

FLUE WAYS

HEAT EXCHANGER

Next: End

BLOCKED 2

PILOT BURNER

Next: End

FLAME SENSE

MAIN PCB

Next: End

FAULT

Next: End

FAN ELECTRICAL

FAN ASSEMBLY

Next: End

Boiler only heats with CH demand

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p268

Burner shuts down prematurely

CHARACTERISTIC TEST FROM CH OPERATION

Next: p38

Boiler cool, radiators cool

CHARACTERISTIC TEST FROM CH OPERATION

Next: p40

Boiler to temperature, radiators cool

CHARACTERISTIC TEST FROM CH OPERATION

Next: p42

Boiler only heats with DHW demand

CHARACTERISTIC TEST FROM CH OPERATION

Next: !p44

Boiler shuts down prematurely

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p48

Boiler cool, DHW cool

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p50

Boiler to temperature, DHW cool

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p52

Boiler does not react to DHW demand

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p56

BOILER GOES TO OVERHEAT LOCKOUT BEFORE 82°C FLOW TEMPERATURE REACHED

CHARACTERISTIC TEST FROM RUN BOILER TO MAXIMUM TEMPERATURE

Next: !p553

KETTLING OCCURS FLOW TEMPERATURE BELOW 85°C

CHARACTERISTIC TEST FROM RUN BOILER TO MAXIMUM TEMPERATURE

Next: !p555

BOILER CONTINUES TO FIRE, TEMPERATURE ABOVE 85°C AND RISING

CHARACTERISTIC TEST FROM RUN BOILER TO MAXIMUM TEMPERATURE

Next: p558

BOILER KETTLING AND/OR OVERHEAT LOCKOUT OCCURS

CHARACTERISTIC TEST FROM CH OPERATION

Next: p61

PILOT IGNITES AND REMAINS LIT BUT MAIN BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION PILOT AND BURNER IGNITES

Next: p712

PILOT DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION PILOT AND BURNER IGNITES

Next: p714

MAIN BURNER LIGHTS, BUT BAFFLES OR DIES AWAY

CHARACTERISTIC TEST FROM OBSERVATION PILOT AND BURNER IGNITES

Next: p718

PILOT LIGHTS BUT THEN FLAME DIES AWAY

CHARACTERISTIC TEST FROM OBSERVATION PILOT AND BURNER IGNITES

Next: p797

19/05/2022 15:41:18 2203_1_50_1 26/08/2022 08:45:55

20/06/2022 09:50:46

Next: End

PUMP VOLTAGE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p63, f62

POTENTIOMETER/HARNESS ASSEMBLY

{ISOLATEMAINSPOWER}
SEPARATE THE POTENTIOMETER/HARNESS ASSEMBLY AT THE INLINE CONNECTOR

Next: !p478, !f460

PUMP VOLTAGE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: !p194, !f193

PUMP VOLTAGE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: !p208, !f207

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: !p218, !f217

PUMP VOLTAGE DHW DEMAND

{ISOLATEMAINSPOWER}<

Next: !p238, !f237

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: !p248, !f247

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: !p465, !f375

POTENTIOMETER/HARNESS ASSEMBLY

{ISOLATEMAINSPOWER}
SEPARATE THE POTENTIOMETER/HARNESS ASSEMBLY AT THE INLINE CONNECTOR

Next: !p562, !f563

OBSERVATION IS SPILLAGE STAT (TTB) FITTED

{ISOLATEMAINSPOWER}

Next: p615, f679

MAINS VOLTAGE SUPPLY

USE INSULATION MAT AS REQUIRED

Next: p84, f83

OVERHEAT THERMOSTAT RESISTANCE AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL1 FROM THE PCB

Next: p651, f652

OVERHEAT THERMOSTAT RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT BOTH WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p653, !f654

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: !p657, !f658

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}
REMOVE THE AIR PRESSURE SWITCH TUBES

Next: p661, !f662

POTENTIOMETER/HARNESS ASSEMBLY

{ISOLATEMAINSPOWER}
SEPARATE THE POTENTIOMETER/HARNESS ASSEMBLY AT THE INLINE CONNECTOR

Next: !p667, !f668

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}
REMOVE THE AIR PRESSURE SWITCH TUBES

Next: p673, !f674

APS VOLTAGE (N/C) CH DEMAND

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT
USE INSULATION MAT AS REQUIRED

Next: p680, f681

OVERHEAT THERMOSTAT RESISTANCE AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL1 FROM THE PCB

Next: p682, f683

OVERHEAT THERMOSTAT RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT BOTH WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p684, !f685

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: !p688, !f689

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}
REMOVE THE AIR PRESSURE SWITCH TUBES

Next: p692, !f693

POTENTIOMETER/HARNESS ASSEMBLY

{ISOLATEMAINSPOWER}
SEPARATE THE POTENTIOMETER/HARNESS ASSEMBLY AT THE INLINE CONNECTOR

Next: !p698, !f699

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}
REMOVE THE AIR PRESSURE SWITCH TUBES

Next: p704, !f705

GAS VALVE PILOT RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR FROM THE GAS VALVE.

Next: !p749, !f750

GAS VALVE MAIN RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT THE CONNECTOR FROM THE GAS VALVE

Next: !p781, !f782

AIR PRESSURE SWITCH VOLTAGE (N/O) CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p784, f785

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}
REMOVE THE AIR PRESSURE SWITCH TUBES

Next: p786, !f787

PILOT FLAME PICTURE

EXTERNAL CONTROLS CALLING FOR HEAT

Next: p820, f821

PILOT INJECTOR

{ISOLATEMAINSPOWER}

Next: p822, !f823

MAINS POWER SUPPLY FUSE

{ISOLATEMAINSPOWER}
REMOVE THE FUSE FROM THE APPLIANCE MAINS POWER SUPPLY I.E. FUSED SPUR

Next: !p86, !f85

PUMP LIMPET TEST CH DEMAND

Next: p306, !f195

PUMP LIMPET TEST CH DEMAND

Next: p206, !f205

EXTERNAL BYPASS

Next: !p210, !f209

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: p214, !f213

BURNER PRESSURE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p216, f215

GAS RATE - CH DEMAND

Next: !p220, !f251

PUMP LIMPET TEST DHW DEMAND

Next: p240, !f239

EXTERNAL BYPASS

Next: !p242, !f241

BURNER PRESSURE DHW DEMAND

{ISOLATEMAINSPOWER}<

Next: p246, f245

GAS RATE - DHW DEMAND

Next: !p249, !f250

TEMPERATURE SENSOR RESISTANCE AT PCB CONNECTOR

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL1 FROM THE PCB

Next: p317, f374

EXTERNAL BYPASS

Next: p318, !f319

BURNER PRESSURE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p549, !f321

SYSTEM TEMPERATURE CH DEMAND

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: p386, !f233

MAINS VOLTAGE FROM EXTERNAL CONTROLS AFTER SHUTDOWN CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p390, !f389

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: p391, !f392

DOES THE BOILER GO TO LOCKOUT - CH DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p394, !f393

MAINS VOLTAGE FROM EXTERNAL CONTROLS AFTER SHUTDOWN DHW DEMAND

{ISOLATEMAINSPOWER}<

Next: p400, !f399

MAINS VOLTAGE FROM EXTERNAL CONTROLS CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p212, !f211

TEMPERATURE SENSOR RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT WIRES FROM THE TEMPERATURE SENSOR

Next: p401, !f402

DOES THE BOILER GO TO LOCKOUT - DHW DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p404, !f403

LOCKOUT RESET SWITCH

{ISOLATEMAINSPOWER}

Next: !p409, !f408

DOES THE PUMP RUN - CH DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: p204, f203

SYSTEM TEMPERATURE DHW DEMAND

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: p397, !f275

MAINS VOLTAGE FROM EXTERNAL CONTROL DHW DEMAND

{ISOLATEMAINSPOWER}<

Next: p244, !f382

DOES THE PUMP RUN - DHW DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: p236, f235

RUN BOILER TO MAXIMUM TEMPERATURE

{ISOLATEMAINSPOWER}<

Next: !p556, ?552, ?554, ?557

CH TEMPERATURE CONTROL RESISTANCE

{ISOLATEMAINSPOWER}<

Next: !p559, f561

DOES THE PUMP RUN - CH DEMAND

EXTERNAL CONTROLS CALLING FOR HEAT

Next: p192, f191

FLUE THERMOSTAT RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL2 FROM THE PCB

Next: p648, !f617

FAN VOLTAGE CH DEMAND

ENSURE EXTERNAL CONTROL ARE CALLING FOR HEAT
USE INSULATION MAT AS REQUIRED

Next: p65, f614

APS VOLTAGE (N/C) CH DEMAND

ENSURE EXTERNAL CONTROLS ARE CALLING FOR HEAT
USE INSULATION MAT AS REQUIRED

Next: p649, f650

AIR PRESSURE SWITCH RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: p671, f672

HARNESS - FAN AND GAS VALVE

{ISOLATEMAINSPOWER}

Next: !p95, !f458

TEMPERATURE SENSOR RESISTANCE AT PCB CONNECTOR

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL1 FROM THE PCB

Next: p655, f656

AIR PRESSURE SWITCH RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: p659, f660

CH TEMPERATURE CONTROL RESISTANCE

{ISOLATEMAINSPOWER}<

Next: p665, f666

VENTURI

{ISOLATEMAINSPOWER}

Next: !p663, !f664

HARNESS - LIMIT THERMOSTAT AND AIR PRESSURE SWITCH

{ISOLATEMAINSPOWER}

Next: !p669, !f670

FUSE 1

{ISOLATEMAINSPOWER}
REMOVE FUSE 1 FROM THE PCB MODULE

Next: !p677, !f678

VENTURI

{ISOLATEMAINSPOWER}

Next: !p675, !f676

AIR PRESSURE SWITCH RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: p702, f703

TEMPERATURE SENSOR RESISTANCE AT PCB CONNECTOR

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL1 FROM THE PCB

Next: p686, f687

AIR PRESSURE SWITCH RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: p690, f691

CH TEMPERATURE CONTROL RESISTANCE

{ISOLATEMAINSPOWER}<

Next: p696, f697

VENTURI

{ISOLATEMAINSPOWER}

Next: !p694, !f695

HARNESS - LIMIT THERMOSTAT AND AIR PRESSURE SWITCH

{ISOLATEMAINSPOWER}

Next: !p700, !f701

FUSE 1

{ISOLATEMAINSPOWER}
REMOVE FUSE 1 FROM THE PCB MODULE

Next: !p708, !f709

VENTURI

{ISOLATEMAINSPOWER}

Next: !p706, !f707

OBSERVATION PILOT

EXTERNAL CONTROL CALLING FOR HEAT

Next: p759, f819

OBSERVATION SPARKING AT ELECTRODE

EXTERNAL CONTROL CALLING FOR HEAT

Next: p727, f783

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p802, !f720

BURNER INJECTOR

{ISOLATEMAINSPOWER}

Next: !p818, !f722

GAS VALVE PILOT VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p745, !f746

GAS VALVE PILOT RESISTANCE AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL3 FROM THE PCB

Next: p747, f748

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p751, !f752

SPARK ELECTRODE GAP

{ISOLATEMAINSPOWER}

Next: p753, !f754

PILOT INJECTOR

{ISOLATEMAINSPOWER}

Next: p755, !f756

PILOT PIPE

{ISOLATEMAINSPOWER}

Next: !p757, !f758

GAS VALVE MAIN VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p777, !f778

GAS VALVE MAIN RESISTANCE AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR PL3 FROM THE PCB.

Next: !p779, f780

SPARK ELECTRODE ASSEMBLY CONDITION

{ISOLATEMAINSPOWER}
DISCONNECT THE SPARK ELECTRODE LEAD FROM THE PCB AND THE PILOT ASSEMBLY

Next: p792, !f793

VENTURI

{ISOLATEMAINSPOWER}

Next: p788, !f789

FLUE

Next: !p790, !f791

HARNESS - LIMIT THERMOSTAT AND AIR PRESSURE SWITCH

{ISOLATEMAINSPOWER}

Next: !p794, !f795

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p798, !f799

PILOT BURNER

{ISOLATEMAINSPOWER}

Next: !p800, !f801

BURNER PRESSURE CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p808, !f806

FLUE

Next: p813, !f812

INSPECTION BURNER

{ISOLATEMAINSPOWER}

Next: p719, !f817

SPARK ELECTRODE ASSEMBLY CONDITION

{ISOLATEMAINSPOWER}
DISCONNECT THE SPARK ELECTRODE LEAD FROM THE PCB AND THE PILOT ASSEMBLY

Next: !p826, !f827

PILOT PIPE

{ISOLATEMAINSPOWER}

Next: !p824, !f825

MAINS VOLTAGE FROM EXTERNAL CONTROLS CH DEMAND

{ISOLATEMAINSPOWER}<

Next: p88, !f87

FUSE 2

{ISOLATEMAINSPOWER}
REMOVE THE FUSE 2 FROM THE PCB MODULE

Next: p90, !f89

ON/OFF SWITCH RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE CONNECTION PL5 FROM THE PCB

Next: p407, f186

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