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:

IDEAL ISAR M30/100

GLOBALLY REPLACED

Next: &110, *

NO FAULT FOUND

Next: nff

IDEAL ISAR M30/100

{ISOLATEMAINSPOWER}<

Next: &599, !f111

FAN RUNS (PREHEAT)

BOILER MAINS SWITCH ON

Next: &325, ?950, ?952

PREHEAT SATISFACTORY

ENSURE SECONDARY HEA

Next: &179, ?309, ?311, ?797, ?1340, ?1611

CH DEMAND

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX

Next: &181, f229

DHW OPERATION

BOILER ON OFF SWITCH ON
BOILER DHW THERMOSTAT SET TO MAX

Next: &205, ?342, ?352, ?390, ?435, ?1382

DHW BURNER MODULATION

SET THE DHW FLOW RATE AT THE TAP TO APPROXIMATELY 3.0 L/MIN (0.7GALL/MIN )

Next: &209, f1287

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAXIMUM

Next: &221, ?437, ?439, ?517, ?519

CH BURNER MODULATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX

Next: &nff, f1920

PUMP RUNS (PREHEAT)

BOILER MAINS SWITCH ON

Next: &136, ?237, ?239

BURNER IGNITES (PREHEAT)

BOILER MAINS SWITCH ON

Next: &168, ?1832, ?1834

POWER UP

Next: &623, ?837, ?839

DIAGNOSTIC OPTIONS

PLEASE SELECT FROM O

Next: &1332, f624

OVER HEAT OPERATED

Next: &nff, f966

DHW FLOW RATE

Next: &1482, f1333

OBSERVATION DOES BOILER RECOGNISE A DEMAND

Next: &236, f1483

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER FOR FUSE INVESTIGATION

Next: &nff, f2276

PUMP VOLTAGE PREHEAT COMPLETE9999

PCB

Next: End

DETACHED

SENSORS

Next: End

9999999STICKING PREHEAT COMPLETE

PUMP

Next: End

9999999IMPELLER PREHEAT COMPLETE

PUMP

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

POTS

USER CONTROL (DISPLAY UNIT)

Next: End

CLOSED TOO MUCH 3

Next: End

H_1 FC DIAGOVERHEAT SECTION

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

OVERHEAT SECTIONH_2 FC DIAG

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

REPAIR AS NEC

HARNESS SENSOR

Next: End

PREHEAT SATISFACTORY

Next: End

PREHEAT INPUT CHECK

POWER TO EXT CONTROLS

Next: End

LINK FAULT

POWER TO EXT CONTROLS

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

DHW MODULATION

SENSOR DHW

Next: End

O/H SECTION LINK IN SUPPLY CH DEMAND

POWER TO EXT CONTROLS

Next: End

PUMP RUNS PREHEAT

HARNESS SENSOR

Next: End

DHW FLOW RATE

FLOW REGULATOR/FILTER

Next: End

RADS COOL CH OPPREHEAT

SENSOR DHW

Next: End

RADS COOL CH OPPREHEAT999

SENSOR DHW

Next: End

PASSING CH DEMAND

TAPS

Next: End

PASSING CH OPPREHEAT

TAPS

Next: End

DHW FLOW RATE DHW OP

FLOW REGULATOR/FILTER

Next: End

PUMP DOES NOT RUN FOR PREHEAT

SENSOR DHW

Next: End

OUTPUT TO DISPLAY BOARD POWER UP

PCB

Next: End

FC DIAG H_N

POLARITY REVERSAL

Next: End

LF OR HF DOT FAULT CODE

KIT - FLAME DETECTION ELECTRODE

Next: End

DOES NOT RECOGNISE DEMAND

SENSOR DHW

Next: End

DOES NOT RECOGNISE DEMAND

FAN

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS FAN

Next: End

OVERHEAT OPERATED

SENSOR DHW

Next: End

RADS COOL CH OP

PCB

Next: End

DIVERTER VOLTAGE CH OP

PCB

Next: End

RADS COOL CH OP

SENSOR DHW

Next: End

PASSING CH OP

TAPS

Next: End

RADS TOO COOL BOILER TO TEMP

KIT - DIVERTOR VALVE

Next: End

1 DASH/DOT FAULT CODE

HARNESS MAIN PCB DISPLAY BOARD

Next: End

DASH/DOT FAULT CODE

USER CONTROL (DISPLAY UNIT)

Next: End

NO LIGHTS

PCB AND FAN

Next: End

POWER UP

HARNESS MAIN PCB DISPLAY BOARD

Next: End

ONLY ON OFF SWITCH ILLUMINATED

USER CONTROLS HOUSING

Next: End

DHW QUIET OPERATION RADIATORS WARM

PCB

Next: End

DHW TEMP RISE POOR RADS WARM

HARNESS MAINS

Next: End

BLOCKED

SECONDARY HEAT EXCHANGER

Next: End

PREHEAT SATISFACTORY

KIT - DIVERTOR VALVE

Next: End

ON WITH NO DEMAND

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

ON WITH NO DEMAND

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

3 DASHES

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

3 DASHES

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

3 DASHES

SENSOR DHW

Next: End

3 DASHES FAULT CODE

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

3 DASHES FAULT CODE

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

3 DASHES FAULT CODE

SENSOR DHW

Next: End

FLASHES LA OR HA

SYSTEM FILL AND VENT

Next: End

FLASHES LA OR HA

BOILER OVERHEAT

Next: End

LA OR HA FAULT CODE

OVERHEAT THERMOSTAT

Next: End

LA OR HA RESETS SHOWS 3 DASHES

BOILER OVERHEAT

Next: End

3 DASHES

BOILER OVERHEAT

Next: End

3 DASHES NO RESET

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

3 DASHES NO RESET

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

LA OR HA THEN 3 DASHES

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

LA OR HA THEN 3 DASHES

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

LA OR HA NO RESET

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

LA OR HA NO RESET

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

LA OR HA NO RESET

SENSOR DHW

Next: End

RESETS SHOWS 3 DASHES

SENSOR DHW

Next: End

LA OR HA FAULT CODE

SENSOR DHW

Next: End

BLOCKED DHW OP

SECONDARY HEAT EXCHANGER

Next: End

DHW QUIET OPERATION RADIATORS WARM

KIT - DIVERTOR VALVE

Next: End

BURNER IGNITES (PREHEAT)

GAS INLET PRESSURE

Next: End

BURNER ESTABLISHES (PREHEAT)

KIT - FLAME DETECTION ELECTRODE

Next: End

DASH/DOT FAULT CODE

USER CONTROLS HOUSING

Next: End

CH BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

CH MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

DHW BURNER MODULATION

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

DHW BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

DHW MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

OVERHEAT

USER CONTROL (DISPLAY UNIT)

Next: End

NOISY

Next: End

OVERHEAT/DOES NOT RESPOND TO CH

POWER TO EXT CONTROLS

Next: End

POWER UP

HARNESS MAIN PCB DISPLAY BOARD PLUS SWITCH

Next: End

DOES NOT RUN 2

HARNESS FAN

Next: End

FAN DOES NOT RUN

KIT - FLAME DETECTION ELECTRODE

Next: End

DOES NOT RUN 3

HARNESS FAN

Next: End

FAN DAMAGED PCB

PCB AND FAN

Next: End

FAN DOES NOT RUN 2

KIT - FLAME DETECTION ELECTRODE

Next: End

DOES NOT RUN

HARNESS FAN

Next: End

FAN DAMAGED PCB 2

PCB AND FAN

Next: End

FAN DOES NOT RUN L8

KIT - FLAME DETECTION ELECTRODE

Next: End

DOES NOT RUN 3 L8

HARNESS FAN

Next: End

FAN DAMAGED PCB L8

PCB AND FAN

Next: End

FAN DOES NOT RUN 2 L8

KIT - FLAME DETECTION ELECTRODE

Next: End

DOES NOT RUN L8

HARNESS FAN

Next: End

FAN DAMAGED PCB 2 L8

PCB AND FAN

Next: End

DOES NOT RUN 2 L8

HARNESS FAN

Next: End

PREHEAT SATISFACTORY

PCB

Next: End

RADS WARM NO CH DEMAND

HARNESS MAINS

Next: End

STICKING

KIT - DIVERTOR VALVE

Next: End

STICKING 2

KIT - DIVERTOR VALVE

Next: End

NOISY

SYSTEM FILL AND VENT

Next: End

NOISY 2

SYSTEM FILL AND VENT

Next: End

NOISY 3

SYSTEM FILL AND VENT

Next: End

DHW OPERATION

OVERHEAT THERMOSTAT

Next: End

DHW OPERATION

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

DHW OPERATION

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

DHW OPERATION

FLUE THERMISTOR

Next: End

OUT OF CALIBRATION 2

SENSOR DHW

Next: End

RESTRICTED OR BLOCKED

CONDENSATE TRAP AND SEAL

Next: End

RUNNING SLOW / WEAK

PUMP

Next: End

CLOSED TOO MUCH

Next: End

DHW OPERATION POOR TEMP RISE

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

DHW OPERATION POOR TEMP RISE

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

DHW OPERATION POOR TEMP RISE

FLUE THERMISTOR

Next: End

OUT OF CALIBRATION 3

SENSOR DHW

Next: End

RUNNING SLOW / WEAK 2

PUMP

Next: End

LOW

GAS INLET PRESSURE

Next: End

CLOSED TOO MUCH 2

Next: End

PASSING MIXER TAP

PLUMBING ISSUE

Next: End

RESTRICTED OR BLOCKED

BURNER INJECTOR

Next: End

RESTRICTED OR BLOCKED - POOR DHW

CONDENSATE TRAP AND SEAL

Next: End

RESTRICTED POOR DHW

BURNER

Next: End

RESTRICTED OR BLOCKED 2

CONDENSATE TRAP AND SEAL

Next: End

LOW 2

GAS INLET PRESSURE

Next: End

RESTRICTED OR BLOCKED

IMPULSE TUBE

Next: End

INNER BREACHED OR BLOCKED

FLUE

Next: End

LEAKING CAUSING BAFFLING ETC

TURRET GASKET

Next: End

DAMAGED OR BLOCKED

BURNER

Next: End

COLLAPSED IN AFFECTING COMBUSTION

INSULATION COMBUSTION CHAMBER

Next: End

RESTRICTED OR BLOCKED

FLUE WAYS

Next: End

RESTRICTED OR BLOCKED 2

BURNER INJECTOR

Next: End

RADS COOL CH OP 2

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

RADS TOO COOL BOILER TO TEMP SHUTS DOWN PREMATURELY

KIT - DIVERTOR VALVE

Next: End

RADS COOL CH OP SHUTS DOWN PREMATURELY

PCB

Next: End

DIVERTER VOLTAGE CH OP SHUTS DOWN PREMATURELY

PCB

Next: End

RADS COOL CH OP SHUTS DOWN PREMATURELY

SENSOR DHW

Next: End

PASSING CH OP SHUTS DOWN PREMATURELY

TAPS

Next: End

SHUTS DOWN PREMATURELY 2

KIT - DIVERTOR VALVE

Next: End

CH OPERATION 2

PUMP

Next: End

OPEN TOO MUCH 2

Next: End

PREMATURE SHUTDOWN 1

USER CONTROL (DISPLAY UNIT)

Next: End

PREMATURE SHUTDOWN

USER CONTROL (DISPLAY UNIT)

Next: End

CH OPERATION

TURRET GASKET

Next: End

RESTRICTED OR BLOCKED 8

CONDENSATE TRAP AND SEAL

Next: End

PREMATURE SHUTDOWN

TURRET GASKET

Next: End

PREMATURE SHUTDOWN

CONDENSATE TRAP AND SEAL

Next: End

FUSE BLOWN 3

HARNESS MAINS

Next: End

FUSE F1 BLOWS PREHEAT

FAN

Next: End

FUSE BLOW

GAS VALVE

Next: End

ELECTRICAL SHORT

KIT - DIVERTER VALVE ACTUATOR

Next: End

SHORTED

EMC FILTER

Next: End

POWER UP

FUSE MAINS

Next: End

POWER UP

FUSE MAIN PCB F1

Next: End

BURNER ESTABLISHES (PREHEAT)

CONDENSATE TRAP AND SEAL

Next: End

BURNER IGNITES (PREHEAT)

FLUE

Next: End

BURNER ESTABLISHES (PREHEAT)

TURRET GASKET

Next: End

GAP

FLAME DETECTION ELECTRODE GAP

Next: End

BURNER ESTABLISHES (PREHEAT)

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

INSULATION COMBUSTION CHAMBER

Next: End

BURNER ESTABLISH

PRIMARY HEAT EXCHANGER

Next: End

BURNER DOES NOT IGNITE

IMPULSE TUBE

Next: End

BURNER IGNITES (PREHEAT)

BURNER INJECTOR

Next: End

BURNER IGNITES (PREHEAT)

CONDENSATE TRAP AND SEAL

Next: End

BURNER IGNBURNER ESTABLISHES (PREHEAT)

BURNER

Next: End

BURNER DOES NOT IGNITE

INSULATION COMBUSTION CHAMBER

Next: End

SPARKING BUT DOES NOT IGNITE

FLUE WAYS

Next: End

WATER

IMPULSE TUBE

Next: End

FAULT FURTHER INVESTIGATION

OVERHEAT THERMOSTAT

Next: End

BURNER IGNITES (PREHEAT)

GAS VALVE

Next: End

SPARKING PRESENT BUT NO IGNITION

PCB

Next: End

BURNER DOES NOT IGNITE

CONDENSATE TRAP AND SEAL

Next: End

BURNER DOES NOT IGNITE

BURNER INJECTOR

Next: End

BURNER IGNITES (PREHEAT) LF

GAS INLET PRESSURE

Next: End

BURNER ESTABLISHES (PREHEAT) LF

KIT - FLAME DETECTION ELECTRODE

Next: End

BURNER ESTABLISHES (PREHEAT) LF

CONDENSATE TRAP AND SEAL

Next: End

BURNER IGNITES (PREHEAT) LF

FLUE

Next: End

BURNER ESTABLISHES (PREHEAT) LF

TURRET GASKET

Next: End

GAP LF

FLAME DETECTION ELECTRODE GAP

Next: End

BURNER ESTABLISHES (PREHEAT) LF

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH LF

INSULATION COMBUSTION CHAMBER

Next: End

BURNER ESTABLISH LF

PRIMARY HEAT EXCHANGER

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

NOT IGNITING

IGNITION ELECTRODE WARPED

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

BURNER IGNITES (PREHEAT)

IGNITION ELECTRODE AND LEAD

Next: End

BURNER IGNITES (PREHEAT) LF

IGNITION ELECTRODE AND LEAD

Next: End

BURNER DOES NOT IGNITE LF

IMPULSE TUBE

Next: End

BURNER IGNITES (PREHEAT) LF

BURNER INJECTOR

Next: End

PUMP RUNS (PREHEAT)

FLUE THERMISTOR

Next: End

BURNER IGNITES (PREHEAT) LF

CONDENSATE TRAP AND SEAL

Next: End

BURNER IGNBURNER ESTABLISHES (PREHEAT) LF

BURNER

Next: End

BURNER DOES NOT IGNITE LF

INSULATION COMBUSTION CHAMBER

Next: End

SPARKING BUT DOES NOT IGNITE LF

FLUE WAYS

Next: End

NOT IGNITING LF

IGNITION ELECTRODE WARPED

Next: End

WATER LF

IMPULSE TUBE

Next: End

FAULT FURTHER INVESTIGATION LF

OVERHEAT THERMOSTAT

Next: End

BURNER IGNITES (PREHEAT) LF

GAS VALVE

Next: End

PUMP RUNS (PREHEAT)

SENSOR DHW

Next: End

SPARKING PRESENT BUT NO IGNITION LF

PCB

Next: End

BURNER DOES NOT IGNITE LF

CONDENSATE TRAP AND SEAL

Next: End

BURNER DOES NOT IGNITE LF

BURNER INJECTOR

Next: End

LA OR HA FAULT CODE H9 L9

SENSOR DHW

Next: End

LA OR HA THEN 3 DASHES H9 L9

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

LA OR HA THEN 3 DASHES H9 L9

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

RESETS SHOWS 3 DASHES H9 L9

SENSOR DHW

Next: End

3 DASHES NO RESET H9 L9

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

3 DASHES NO RESET H9 L9

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

LA OR HA RESETS SHOWS 3 DASHES H9 L9

BOILER OVERHEAT

Next: End

LA OR HA FAULT CODE H9 L9

OVERHEAT THERMOSTAT

Next: End

LA OR HA NO RESET H9 L9

SENSOR DHW

Next: End

LA OR HA NO RESET H9 L9

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

LA OR HA NO RESET H9 L9

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

FLASHES LA OR HA H9 L9

BOILER OVERHEAT

Next: End

FLASHES LA OR HA H9 L9

SYSTEM FILL AND VENT

Next: End

PRE HEATFCDIAG 2

KIT - FLAME DETECTION ELECTRODE

Next: End

HE / LE 2

FAN

Next: End

HE OR LE FAULT CODES 2

SENSORS

Next: End

HE / LE 2

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

HE / LE 2

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

HE / LE

OVERHEAT THERMOSTAT

Next: End

PRE HEATFCDIAG 2 2

KIT - FLAME DETECTION ELECTRODE

Next: End

HE / LE 2 2

FAN

Next: End

HE OR LE FAULT CODES 2 2

SENSORS

Next: End

HE / LE 2 2

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

HE / LE 2 2

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

HE / LE 2

OVERHEAT THERMOSTAT

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

FAN DOES NOT RUN

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

INSUFFICIENT OUTPUT

FLUE WAYS

Next: End

DHW NOISY

PRIMARY HEAT EXCHANGER

Next: End

DHW OPERATION

PUMP

Next: End

CH NOISY OPERATION

Next: End

CH OPERATION

KIT - DIVERTOR VALVE

Next: End

CH OPERATION

PUMP

Next: End

RADIATORS COOL BOILER TO TEMPERATURE

Next: End

PREHEAT SATISFACTORY

CONDENSATE TRAP AND SEAL

Next: End

FLAME DETECTION

PCB

Next: End

H_4 FC DIAG 2

FLUE THERMISTOR

Next: End

FC DIAG H_4 NOT FILLED AND VENTED

SYSTEM FILL AND VENT

Next: End

H_3 FC DIAG

SENSOR DHW

Next: End

H_2 FC DIAG

THERMISTOR- BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAG

THERMISTOR - BOILER CONTROL ( FLOW)

Next: End

POWER UP

Next: End

FAULT

EMC FILTER

Next: End

POWER UP

PCB

Next: End

PRE HEATFCDIAG99

KIT - FLAME DETECTION ELECTRODE

Next: End

PREHAT COMPLET9999

PUMP

Next: End

9999999PUMP CAVITAION PREHEAT COMPLETE

Next: End

OVERHEAT PROBLEM

SECONDARY HEAT EXCHANGER

Next: End

9999999PREHEAT NOISY999

PRIMARY HEAT EXCHANGER

Next: End

FLOW FC DIAGOVERHEAT SECTION

HARNESS SENSOR

Next: End

OVERHEAT SECTIONRETURN FC DIAG

HARNESS SENSOR

Next: End

INCORRECT POSITION

PCB LINKS

Next: End

FAULT CODE LA

Z DIRECTION CHOICE OR CONTINUE

Next: o1235-f966, *

HA FCODE

FLUE THERMISTOR

Next: End

FROM PCB

HARNESS MAINS

Next: End

PREHEAT SATISFACTORY

PRIMARY HEAT EXCHANGER

Next: End

CH INPUT

MULTI FAULT PCB

Next: End

EXTERNAL CONTROL

HARNESS INPUT

Next: End

PREHEAT DEMAND

Next: End

EXTERNAL CONTROL

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

CH DEMAND

EXTERNAL ROOM THERMOSTAT/ TIMER

Next: End

O/H SECTION NO REACT TO CH DEMAND

Next: End

FAULTY

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

OH SECTION

MULTI FAULT PCB

Next: End

PUMP RUNS THEN STOPS

PCB

Next: End

DHW FLOW RATE

SECONDARY HEAT EXCHANGER

Next: End

CH DEMAND

PCB

Next: End

PRE HEAT STUCK CH OPPREHEAT

PCB

Next: End

DHW FLOW RATE DHW OP

SECONDARY HEAT EXCHANGER

Next: End

PUMPVOLTAGE PUMP RUNS PRE HEAT

PCB

Next: End

PUMP DOES NOT RUN

HARNESS SENSOR

Next: End

FLASHES H THEN N

PCB

Next: End

HB OR LB FAULT CODE

USER CONTROL C/W CONTROL KNOB

Next: End

LF OR HF DOT FAULT CODE

PCB

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS SENSOR

Next: End

RADS WARM NO DEMAND

KIT - DIVERTER VALVE ACTUATOR

Next: End

STICKING RADS WARM NO DEMAND

KIT - DIVERTER VALVE ACTUATOR

Next: End

STICKING DHW QUIET RADS WARM

KIT - DIVERTER VALVE ACTUATOR

Next: End

DHW QUIET RADS WARM

KIT - DIVERTER VALVE ACTUATOR

Next: End

OVERHEAT OPERATED

HARNESS SENSOR

Next: End

CH OPERATION

KIT - DIVERTER VALVE ACTUATOR

Next: End

PRE HEAT STUCK CH OP

PCB

Next: End

1 DASH/DOT FAULT CODE

PCB

Next: End

POWER UP

PCB DISPLAY BOARD PLUS SWITCH

Next: End

POWER UP OUT PUT TO DISPLAY BOARD

PCB MAIN PLUS SWITCH

Next: End

NO LIGHTS

HARNESS FAN

Next: End

POWER UP

USER CONTROL (DISPLAY UNIT)

Next: End

DHW OPERATION

KIT - DIVERTER VALVE ACTUATOR

Next: End

LETBY PREHEAT

KIT - DIVERTOR VALVE

Next: End

ON WITH NO DEMAND

EXTERNAL ROOM THERMOSTAT/ TIMER

Next: End

ON WITH NO DEMAND

PCB

Next: End

3 DASHES FAULT CODE

PCB

Next: End

3 DASHES

PCB

Next: End

3 DASHES FLOW THERMISTOR

HARNESS SENSOR

Next: End

3 DASHES RETURN THERMISTOR

HARNESS SENSOR

Next: End

3 DASHES DHW THERMISTOR

HARNESS SENSOR

Next: End

3 DASHES FLOW

HARNESS SENSOR

Next: End

3 DASHES RETURN

HARNESS SENSOR

Next: End

3 DASHES DHW

HARNESS SENSOR

Next: End

FLASHES LA OR HA

Z DIRECTION CHOICE OR CONTINUE

Next: End

LA OR HA FAULT CODE

HARNESS MAINS

Next: End

OVERHEAT

PCB

Next: End

LA OR HA RESETS SHOWS 3 DASHES

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT TEMPERATURE

PCB

Next: End

OVERHEAT 3 DASHES FAULT CODE

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT TEMP

PCB

Next: End

RESETS SHOWS 3 DASHES FLOW

HARNESS SENSOR

Next: End

RESETS SHOWS 3 DASHES RETURN

HARNESS SENSOR

Next: End

3 DASHES

HARNESS SENSOR

Next: End

3 DASHES 1

HARNESS SENSOR

Next: End

LA OR HA NO CONTROL THERMISTOR

HARNESS SENSOR

Next: End

LA OR HA RETURN THERMISTOR

HARNESS SENSOR

Next: End

LA OR HA DHW THERMISTOR

HARNESS SENSOR

Next: End

RESETS SHOW 3 DASHES DHW

HARNESS SENSOR

Next: End

3 DASHES 2

HARNESS SENSOR

Next: End

LETBY DHW OPERATION

KIT - DIVERTOR VALVE

Next: End

CH BURNER MODULATION

PCB

Next: End

CH MODULATION

PCB

Next: End

DHW BURNER MODULATION

PCB

Next: End

DHW MODULATION

PCB

Next: End

OVERHEAT

SECONDARY HEAT EXCHANGER

Next: End

NOISY

PRIMARY HEAT EXCHANGER

Next: End

OVERHEAT/DOES NOT RESPOND TO CH

MULTI FAULT PCB

Next: End

DOES NOT RESPOND TO CH

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

OVERHEAT/DOES NOT RESPOND TO CH

Next: End

NO LIGHTS

USER CONTROLS HOUSING PLUS SWITCH

Next: End

FAN RUNS (PREHEAT)9 DOES NOT RUN

PCB

Next: End

FC DIAG DOES NOT RUN

FAN

Next: End

FAN RUNS (PREHEAT)9 DOES NOT RUN L8

PCB

Next: End

FAN DOES NOT RUN L8

PCB

Next: End

FC DIAG DOES NOT RUN L8

FAN

Next: End

PREHEAT SATISFACTORY

KIT - DIVERTER VALVE ACTUATOR

Next: End

BOILER CYCLING

PCB

Next: End

RESTRICTED OR BLOCKED

SECONDARY HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED

PRIMARY HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED POOR TEMP RISE

SECONDARY HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED POOR TEMP RISE

PRIMARY HEAT EXCHANGER

Next: End

BOILER CYCLING POOR TEMP RISE

PCB

Next: End

WRONG MIX 2

GAS VALVE

Next: End

CH OPERATION SHUTS DOWN PREMATURELY

KIT - DIVERTER VALVE ACTUATOR

Next: End

PRE HEAT STUCK CH OP SHUTS DOWN PREMATURELY

PCB

Next: End

PREMATURE SHUTDOWN OR BOILER DOESNT FIRE

PCB

Next: End

PREMATURE SHUTDOWN 2

PCB

Next: End

BLOWING FUSES

PUMP

Next: End

FUSE BLOWN

HARNESS FAN

Next: End

FUSE BLOWN 2

HARNESS MAINS

Next: End

FUSE BLOWN

HARNESS MAINS

Next: End

PCB - FUSE BLOWN

PCB - FUSE BLOWN

Next: End

BLANK FOR MAINS FUSE INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR PCB FUSE INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

PCB

Next: End

PRESSURE DROPS AWAY

GAS INLET PRESSURE

Next: End

BURNER DOES NOT IGNITE

OVERHEAT THERMOSTAT

Next: End

BURNER DOES NOT IGNITE

HARNESS SENSOR

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH LF

PCB

Next: End

PUMP RUNS (PREHEAT)

PUMP

Next: End

WRONG MIX

GAS VALVE

Next: End

MECH FAULT

GAS VALVE

Next: End

NO SPARKING PRESENT

IGNITION ELECTRODE GAP

Next: End

NO SPARKING PRESENT AT ELECTRODE

PCB

Next: End

NO SPARKING PRESENT LF

IGNITION ELECTRODE GAP

Next: End

NO SPARKING PRESENT AT ELECTRODE LF

PCB

Next: End

PRESSURE DROPS AWAY LF

GAS INLET PRESSURE

Next: End

WRONG MIX LF

GAS VALVE

Next: End

BURNER DOES NOT IGNITE LF

OVERHEAT THERMOSTAT

Next: End

BURNER DOES NOT IGNITE LF

HARNESS SENSOR

Next: End

MECH FAULT LF

GAS VALVE

Next: End

OVERHEAT TEMPERATURE H9 L9

PCB

Next: End

3 DASHES 2 H9 L9

HARNESS SENSOR

Next: End

3 DASHES 1 H9 L9

HARNESS SENSOR

Next: End

3 DASHES H9 L9

HARNESS SENSOR

Next: End

OVERHEAT TEMP H9 L9

PCB

Next: End

RESETS SHOW 3 DASHES DHW H9 L9

HARNESS SENSOR

Next: End

RESETS SHOWS 3 DASHES RETURN H9 L9

HARNESS SENSOR

Next: End

RESETS SHOWS 3 DASHES FLOW H9 L9

HARNESS SENSOR

Next: End

LA OR HA RESETS SHOWS 3 DASHES H9 L9

Z DIRECTION CHOICE OR CONTINUE

Next: End

LA OR HA FAULT CODE H9 L9

HARNESS MAINS

Next: End

OVERHEAT H9 L9

PCB

Next: End

LA OR HA DHW THERMISTOR H9 L9

HARNESS SENSOR

Next: End

LA OR HA RETURN THERMISTOR H9 L9

HARNESS SENSOR

Next: End

LA OR HA NO CONTROL THERMISTOR H9 L9

HARNESS SENSOR

Next: End

FLASHES LA OR HA H9 L9

Z DIRECTION CHOICE OR CONTINUE

Next: End

LA OR HA FAULT CODE H9 L9

Z DIRECTION CHOICE OR CONTINUE

Next: o2582-f966, *

NO DEMAND

DHW SENSOR - PCB

Next: End

H3 FAULT CODE

DHW SENSOR - PCB

Next: End

L_E FC DIAG 2

PCB

Next: End

L_E FC DIAG 2 2

PCB

Next: End

FAN DOES NOT RUN

PCB

Next: End

DHW NOISY

SECONDARY HEAT EXCHANGER

Next: End

CH NOISY OPERATION

Next: End

RADIATORS COOL, BOILER TO TEMPERATURE

Next: End

CH OPERATION

EXPANSION VESSEL

Next: End

PREHEAT SATISFACTORY

SECONDARY HEAT EXCHANGER

Next: End

NOT FOUND

DIAGNOSTICS CODE

Next: o796-&236, *

H_F FC DIAG

KIT - FLAME DETECTION ELECTRODE

Next: End

H_4 FC DIAG

PCB

Next: End

FLUE FC DIAG 2

HARNESS SENSOR

Next: End

CLEAN REPLACE AS NEC FC DIAG

PRIMARY HEAT EXCHANGER

Next: End

DHW FC DIAG

HARNESS SENSOR

Next: End

H_2 FC DIAG

PCB

Next: End

RETURN FC DIAG

HARNESS SENSOR

Next: End

H_1 FC DIAG

PCB

Next: End

FLOW FC DIAG

HARNESS SENSOR

Next: End

FAULT

HARNESS EMC PCB

Next: End

POWER UP

ON OFF SWITCH

Next: End

L_E FC DIAG99

PCB

Next: End

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1203

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1206

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p1190

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p1307

FLASHES H THEN 5

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: !p1226

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p1254

BOILER KETTLES

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p1255

PREHEAT CYCLE DOES NOT COMPLETE

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p1343

FLOW RATE INCORRECT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1384

HB OR LB (B WILL BE IN LOWER CASE)

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: !p1472

1 DASH AND/OR DOT

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1474

FLASHES L THEN F. OR H THEN F. (NOTE THE DOT AFTER THE F)

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1476

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p2043

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p1501

LEVER CYCLES IN AND OUT CONTINUOUSLY

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p1497

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p2050

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p1505

LEVER CYCLES IN AND OUT CONTINUOUSLY

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p1507

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1517

PREHEAT SATISFACTORY - BOILER FIRES WITH NO DEMAND DISPLAY SHOWS C

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p1612

3 DASHES

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1696

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1709

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1711

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1713

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1717

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1719

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1721

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1740

RESETS SHOWS 3 DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1742

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1753

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1755

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1757

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1766

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1768

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1770

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1773

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1775

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1777

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p1833

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p1835

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: p1971

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: p1973

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p2348

GAS FLOW PRESSURE DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p2350

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM PUMP RUNS (PREHEAT)

Next: p238

PUMP RUNS FOR APPROXIMATELY 5 SECONDS THEN STOPS

CHARACTERISTIC TEST FROM PUMP RUNS (PREHEAT)

Next: p243

SPARK GAP INCORRECT

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: !p2460

SPARK GAP CORRECT BUT NO SPARK PRESENT

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: p2463

SPARK GAP INCORRECT

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: !p2475

SPARK GAP CORRECT BUT NO SPARK PRESENT

CHARACTERISTIC TEST FROM IGNITION ELECTRODE SPARKING AND GAP

Next: p2477

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p2483

GAS FLOW PRESSURE DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p2485

FLASHES H9 OR L9

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p2518

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p2521

RESETS SHOWS 3 DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p2523

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2528

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2530

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2532

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2543

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2545

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2547

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2565

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2567

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2569

RADIATORS WARM WITH NO CH DEMAND

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p310

BOILER KETTLING

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2057

DHW NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2076

DHW TEMPRTAURE RISE INSUFFICIENT, RADS BEGIN TO HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p353

BOILER CYCLING

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2088

DHW TEMPERATURE RISE INSUFFICIENT, RADS REMAIN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2109

CH NOISY OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p2083

BOILER FIRES FOR CH AND REACHES TEMPERATURE BUT RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p461

BOILER SHUTS DOWN PREMATURELY OR DOES NOT FIRE FOR CH

CHARACTERISTIC TEST FROM CH OPERATION

Next: p2214

EXCESSIVE SYSTEM PRESSURE

CHARACTERISTIC TEST FROM CH OPERATION

Next: !p521

FLASHES L THEN E

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p2623

FLASHES LA OR HA

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1227

FLASHES L THEN 8

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p2024

FLASHES H THEN 1

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p633

FLASHES H THEN 2

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p635

FLASHES H THEN 3

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p637

FLASHES H THEN 4

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p639

FLASHES H THEN F

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p641

FLASHES H THEN N

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p1468

FAULT CODE NOT PRESENT RETURN TO STEP BY STEP DIAGNOSIS

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: !p647

NOISE WHEN MODULATING DOWN

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2195

FLASHES H THEN E

CHARACTERISTIC TEST FROM WHAT FAULT CODE IS SHOWN (PASS=L/F)

Next: p2609

NO LIGHTS

CHARACTERISTIC TEST FROM POWER UP

Next: p892

ONLY ON OFF SWITCH ILLUMINATED

CHARACTERISTIC TEST FROM POWER UP

Next: p866

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p1991

FAN HUNTS RUNS SLOWS RUNS SLOWS

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p959

01/11/2019 09:08:16 1910_1_50_1 20/11/2019 10:37:57

24/10/2019 08:11:45

Next: End

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p1070, !f1071

PUMP LIMPET

Next: !p1078, !f1079

HARNESS CHECK - THERMISTORS

{ISOLATEMAINSPOWER}

Next: !p1237, !f1238

PUMP VOLTAGE AT PCB

BOILER MAINS SWITCH

Next: !p1241, f1410

EXTERNAL CONTROLS CALLING

Next: !p1279, f1276

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1285, !f1286

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1277, !f1278

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p1288, !f1295

EXTERNAL CONTROLS CALLING

Next: !p1313, f1310

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1311, !f1312

FLOW REGULATOR/FILTER

{ISOLATEMAINSPOWER}
WATER OFF

Next: !p1334, !f1335

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1411, f1412

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1413, !f1414

POWER TO DISPLAY BOARD

{ISOLATEMAINSPOWER}
LOWER MAIN PCB
DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p1577, f1578

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: p1484, f1485

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1486, !f1487

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p1558, !f1569

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON

Next: p1561, !f1562

RESISTANCE FAN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE FAN CONNECTOR FROM THE PCB

Next: !p1579, f1580

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: !p1581, !f1582

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p1626, !f1627

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1704, ?1716, ?1718, ?1720

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1706, ?1708, ?1710, ?1712

OVERHEAT THERMOSTAT AND HARNESS RESISTANCE

{ISOLATEMAINSPOWER}

Next: p1747, f1748

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: !p1749, !f1750

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1771, ?1772, ?1774, ?1776

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1780, ?1765, ?1767, ?1769

OBSERVATION WHICH USER CONTROL IS FITTED ?

{ISOLATEMAINSPOWER}
REMOVE USER CONTROL

Next: p1921, f1924

RESISTANCE CH POTENTIOMETER

{ISOLATEMAINSPOWER}<

Next: !p1925, !f1926

RESISTANCE DHW POTENTIOMETER

{ISOLATEMAINSPOWER}<

Next: !p1933, !f1934

RESISTANCE DHW POTENTIOMETER

{ISOLATEMAINSPOWER}<

Next: p1966, !f1967

EXTERNAL CONTROLS CALLING

Next: !p1978, f1979

EXTERNAL CONTROLS CALLING

Next: !p1980, !f1981

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2008, !f2009

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2017, !f2018

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2027, !f2028

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2035, !f2036

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p2105, f2106

SYSTEM BYPASS

Next: !p2107, !f2108

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p2124, f2125

SYSTEM BYPASS

Next: !p2126, !f2127

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p2219, !f2220

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON

Next: p2223, !f2224

RESISTANCE CH POTENTIOMETER

{ISOLATEMAINSPOWER}<

Next: p2270, !f2260

RESISTANCE PUMP AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: p2277, f2278

RESISTANCE HARNESS PUMP

{ISOLATEMAINSPOWER}<

Next: !p2279, !f2280

FAN RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT THE HARNESS FROM FAN

Next: !p2283, !f2284

GAS VALVE RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM GAS VALVE

Next: !p2287, !f2288

EXTERNAL CONTROLS VOLTAGE OUT PCB

Next: p1373, f231

DIVERTER VALVE RESISTANCE

{ISOLATEMAINSPOWER}<

Next: !p2291, !f2292

FURTHER INVESTIGATION FUSE (MAINS)

Next: !p2299, !f2300

FURTHER INVESTIGATION FUSE (PCB)

Next: !p2302, !f2303

EXTERNAL CONTROLS CALLING

Next: !p1274, f1273

FURTHER INVESTIGATION OVERHEAT

Next: !p2367, !f2368

GAS VALVE RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM GAS VALVE

Next: !p2371, !f2372

IGNITION ELECTRODE SPARKING AND GAP

{ISOLATEMAINSPOWER}<

Next: p2473, ?2474, ?2476

FURTHER INVESTIGATION OVERHEAT

Next: !p2504, !f2505

GAS VALVE RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM GAS VALVE

Next: !p2508, !f2509

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p2526, ?2527, ?2529, ?2531

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p2541, ?2542, ?2544, ?2546

OVERHEAT THERMOSTAT AND HARNESS RESISTANCE

{ISOLATEMAINSPOWER}

Next: p2558, f2559

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: !p2560, !f2561

WHAT FAULT CODE IS SHOWN

ON /OFF SWITCH ON

Next: p625, ?626, ?628, ?630, ?632, ?634, ?636, ?638, ?640, ?642, ?646, ?811, ?1225, ?1471, ?1473, ?1475, ?1695, ?2516

RESISTANCE CONTROL THERMISTOR FLUE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p652, f653

RESISTANCE CONTROL THERMISTOR FLUE

{ISOLATEMAINSPOWER}<

Next: !p654, !f655

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p664, !f665

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p668, !f669

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p672, !f673

FUSE RESISTANCE (FUSED SPUR)

{ISOLATEMAINSPOWER}
REMOVE FUSE FROM FUSED SPUR

Next: p895, f2298

ON/OFF SWITCH VOLTAGE INPUT

{ISOLATEMAINSPOWER}
REMOVE CONTROL DISPLAY

Next: !p908, !f909

PUMP RUNS

BOILER MAINS SWITCH

Next: p1068, f1069

SENSOR FIXINGS

{ISOLATEMAINSPOWER}

Next: p1073, !f1072

DOES PUMP SPIN FREELY

{ISOLATEMAINSPOWER}<

Next: p1074, !f1075

DOES PUMP STOP QUICKLY

BOILER ON OFF SWITCH ON

Next: p1076, f1077

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: p1947, ?1082, ?1084, ?1516

POTENTIOMETER RESISTANCE (DHW)

{ISOLATEMAINSPOWER}<

Next: p1168, !f1154

CH OPERATION (HEAT EXCHANGER PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAXIMUM

Next: !p1185, ?1186, ?1188

SYSTEM BYPASS

Next: !p1191, !f1192

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1204, !f1205

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1207, !f1208

CAN BOILER BE RESET

Next: p1230, ?1739, ?1741

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: !p1234, !f1738

EXTERNAL CONTROLS VOLTAGE OUT PCB

Next: !p1263, f1267

SYSTEM BYPASS

Next: !p1256, !f1257

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p1289, !f1290

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p1927, !f1928

EXTERNAL CONTROLS VOLTAGE OUT PCB

Next: !p1314, f1308

HARNESS CHECK - THERMISTORS

{ISOLATEMAINSPOWER}

Next: !p1320, !f1321

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p1344, !f1345

TAPS DRIPPING OR MIXER TAPS PASSING

Next: !p1380, !f1381

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p1374, !f1375

TAPS DRIPPING OR MIXER TAPS PASSING

Next: !p1378, !f1379

FLOW REGULATOR/FILTER

{ISOLATEMAINSPOWER}
WATER OFF

Next: !p1385, !f1386

RESISTANCE HARNESS PCB TO DISPLAY BOARD

{ISOLATEMAINSPOWER}
DISCONNECT THE HARNESS FROM MAIN PCB TO DISPLAY PCB

Next: p1588, !f1589

RESISTANCE HARNESS PCB TO DISPLAY BOARD

{ISOLATEMAINSPOWER}
DISCONNECT THE HARNESS FROM MAIN PCB TO DISPLAY PCB

Next: !p1983, !f1984

VOLTAGE POLARITY

{ISOLATEMAINSPOWER}
GAIN ACCESS TO MAINS TERMINAL (USE INSULATION MAT AS REQUIRED)

Next: !p1469, !f1470

RESISTANCE HARNESS PCB TO DISPLAY BOARD

{ISOLATEMAINSPOWER}
DISCONNECT THE HARNESS FROM MAIN PCB TO DISPLAY PCB

Next: p1571, !f1574

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p1477, !f1478

OBSERVATION DISCONNECT FAN - DEMAND RECOGNISED?

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1488, !f1489

OBSERVATION DISCONNECT FAN HARNESS - DEMAND RECOGNISED?

{ISOLATEMAINSPOWER}
REMOVE FAN CONNECTOR FROM PCB

Next: !p2583, !f1491

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON

Next: p1598, !f1599

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1518, !f1519

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON

Next: !p1559, f1560

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p1563, !f1564

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p1565, !f1566

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p1567, !f1568

RESISTANCE USER CONTROLS HOUSING

{ISOLATEMAINSPOWER}

Next: p1572, !f1919

INSPECTION DISPLAY PCB CONNECTIONS

{ISOLATEMAINSPOWER}
REMOVE THE DISPLAY PCB

Next: !p1575, !f1576

RESISTANCE USER CONTROLS HOUSING

{ISOLATEMAINSPOWER}

Next: !p1590, !f1591

RESISTANCE DIVERTER HARNESS

{ISOLATEMAINSPOWER}<

Next: !p1600, !f1601

OBSERVATION DOES PREHEAT COMPLETE

{ISOLATEMAINSPOWER}<

Next: !p1608, !f1609

DISCONNECT EXTERNAL CONTROLS

{ISOLATEMAINSPOWER}
DISCONNECT EXTERNAL CONTROLS AND MAKE SAFE

Next: !p1624, f1625

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1628, !f1629

HEAT EXCHANGER TEMP

Next: p1697, f1698

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p1699, f1701

FURTHER INVESTIGATION OVERHEAT

Next: !p1778, !f1779

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1724, !f1725

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1726, !f1727

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1728, !f1729

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1730, !f1731

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1732, !f1733

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1736, !f1737

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p1743, f1744

HEAT EXCHANGER TEMP

Next: p1758, f1759

FURTHER INVESTIGATION OVERHEAT

Next: !p1745, !f1746

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p1751, ?1752, ?1754, ?1756

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1789, !f1790

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1791, !f1792

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1793, !f1794

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p1760, f1761

FURTHER INVESTIGATION OVERHEAT

Next: !p1762, !f1763

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1781, !f1782

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1783, !f1784

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1795, !f1796

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1785, !f1786

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1787, !f1788

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p1800, !f1801

SECONDARY HEAT EXCHANGER

{ISOLATEMAINSPOWER}<

Next: !p1804, !f1805

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1836, !f1837

IGNITION ELECTRODE SPARKING AND GAP

{ISOLATEMAINSPOWER}<

Next: p2345, ?2459, ?2461

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2304, !f1908

POTENTIOMETER RESISTANCE (CH)

{ISOLATEMAINSPOWER}<

Next: !p1922, !f1923

OBSERVATION WHICH USER CONTROL IS FITTED ?

{ISOLATEMAINSPOWER}
REMOVE USER CONTROL

Next: p1929, f1932

POTENTIOMETER RESISTANCE (DHW)

{ISOLATEMAINSPOWER}<

Next: !p1930, !f1931

OBSERVATION WHICH USER CONTROL IS FITTED ?

{ISOLATEMAINSPOWER}
REMOVE USER CONTROL

Next: p1152, f1965

CH OPERATION (HEAT EXCHANGER PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAXIMUM

Next: !p1968, ?1970, ?1972

SYSTEM BYPASS

Next: !p1974, !f1975

EXTERNAL CONTROLS VOLTAGE OUT PCB

Next: !p1976, f1977

VOLTAGE PERMANENT FAN HALL SENSOR

{ISOLATEMAINSPOWER}<

Next: p1992, f2007

VOLTAGE FAN AT PCB

{ISOLATEMAINSPOWER}<

Next: p1998, f2016

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: !p2019, !f2001

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: p2010, !f2011

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2012, !f2013

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: p2020, !f2021

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: p2636, !f2023

VOLTAGE PERMANENT FAN HALL SENSOR

{ISOLATEMAINSPOWER}<

Next: p2025, f2026

VOLTAGE FAN AT PCB

{ISOLATEMAINSPOWER}<

Next: p2033, f2034

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: p2029, !f2030

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2031, !f2032

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: !p2041, !f2042

RESISTANCE FAN HARNESS

{ISOLATEMAINSPOWER}

Next: p2037, !f2038

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2039, !f2040

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p2044, !f2049

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON

Next: p2045, !f2046

RESISTANCE DIVERTER HARNESS

{ISOLATEMAINSPOWER}<

Next: !p2047, !f2048

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p1513, !f2056

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: p525, !f2075

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: p392, !f2082

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: p438, !f2087

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: p2089, !f2090

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2091, !f2092

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p2093, !f2094

RESISTANCE CONTROL THERMISTOR FLUE

{ISOLATEMAINSPOWER}<

Next: p2095, !f2096

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p2097, !f2098

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2099, !f2100

PUMP LIMPET

Next: p2101, !f2102

TEMPERATURE DIFFERENTIAL DHW

{ISOLATEMAINSPOWER}

Next: !p2103, f2104

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2110, !f2111

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p2112, !f2113

RESISTANCE CONTROL THERMISTOR FLUE

{ISOLATEMAINSPOWER}<

Next: p2114, !f2115

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p2116, !f2117

PUMP LIMPET

Next: p2118, !f2119

PRESSURE GAS INLET (DHW)

{ISOLATEMAINSPOWER}<

Next: p2120, !f2121

TEMPERATURE DIFFERENTIAL DHW

{ISOLATEMAINSPOWER}

Next: p2122, f2123

TEMPERATURE DHW AT APPLIANCE AND OUTLET (MIXER TAP PASSING)

Next: p2128, !f2129

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2130, !f2131

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2132, !f2133

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2134, !f2135

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: !p2136, !f2643

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2196, !f2197

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p2198, !f2199

CHECK IMPULSE TUBE

{ISOLATEMAINSPOWER}

Next: p2200, !f2201

INSPECTION FLUE

Next: p2202, !f2203

PRIMARY FLUE SEAL

{ISOLATEMAINSPOWER}

Next: p2204, !f2205

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2206, !f2207

INSULATION PADS

{ISOLATEMAINSPOWER}
REMOVE FAN AND BURNER

Next: p2208, !f2209

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: p2210, !f2211

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2212, !f2213

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2215, !f2216

DIVERTER VALVE POSITION (CH)

BOILER MAINS SWITCH

Next: p2217, f2218

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p2231, !f2232

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON

Next: !p2221, f2222

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p2225, !f2226

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p2227, !f2228

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p2229, !f2230

PUMP LIMPET

Next: p2233, !f2234

SYSTEM BYPASS

Next: p2256, !f2236

OBSERVATION WHICH USER CONTROL IS FITTED ?

{ISOLATEMAINSPOWER}
REMOVE USER CONTROL

Next: p2257, f2258

POTENTIOMETER RESISTANCE (CH)

{ISOLATEMAINSPOWER}<

Next: p2265, !f2262

PRIMARY FLUE SEAL

{ISOLATEMAINSPOWER}

Next: p2266, !f2267

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: !p2269, !f2268

PRIMARY FLUE SEAL

{ISOLATEMAINSPOWER}

Next: p2271, !f2272

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: !p2274, !f2273

RESISTANCE FAN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE FAN CONNECTOR FROM THE PCB

Next: p2281, f2282

RESISTANCE GAS VALVE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2285, f2286

RESISTANCE DIVERTER VALVE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE DIVERTER VALVE CONNECTOR FROM THE PCB

Next: p2289, f2290

RESISTANCE EMC FILTER

{ISOLATEMAINSPOWER}<

Next: !p2293, !f2297

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2320, !f2305

INSPECTION FLUE

Next: p2321, !f2322

PRIMARY FLUE SEAL

{ISOLATEMAINSPOWER}

Next: p2335, !f2324

FLAME DETECTION ELECTRODE GAP

{ISOLATEMAINSPOWER}

Next: p2336, !f2337

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2338, !f2339

INSULATION PADS

{ISOLATEMAINSPOWER}
REMOVE FAN AND BURNER

Next: p2340, !f2341

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: !p2342, !f2343

GAS VALVE OPENS

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2346, ?2347, ?2349

CHECK IMPULSE TUBE

{ISOLATEMAINSPOWER}

Next: p2363, !f2364

CHECK IMPULSE TUBE

{ISOLATEMAINSPOWER}

Next: p2351, !f2352

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2353, !f2354

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2355, !f2356

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2357, !f2358

INSULATION PADS

{ISOLATEMAINSPOWER}
REMOVE FAN AND BURNER

Next: p2359, !f2360

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: p2452, !f2362

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: p2365, f2366

RESISTANCE GAS VALVE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2369, f2370

VOLTAGE GAS VALVE AT PCB

{ISOLATEMAINSPOWER}
BOILER ON/OFF SWITCH ON

Next: p2373, !f2374

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2375, !f2376

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2455, !f2378

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p241, f1240

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p2383, !f2384

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2385, !f2386

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2387, !f2388

INSPECTION FLUE

Next: p2389, !f2390

PRIMARY FLUE SEAL

{ISOLATEMAINSPOWER}

Next: p2391, !f2392

FLAME DETECTION ELECTRODE GAP

{ISOLATEMAINSPOWER}

Next: p2393, !f2394

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2395, !f2396

INSULATION PADS

{ISOLATEMAINSPOWER}
REMOVE FAN AND BURNER

Next: p2397, !f2398

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: !p2399, !f2400

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p244, !f245

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p246, !f247

IGNITION ELECTRODE GAP

{ISOLATEMAINSPOWER}

Next: !p2453, !f2469

RESISTANCE CONTROL THERMISTOR FLUE

{ISOLATEMAINSPOWER}<

Next: p248, !f249

IGNITION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: !p2471, !f2470

GAS VALVE OPENS

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2480, ?2482, ?2484

IGNITION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: !p2478, !f2479

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: p1319, !f251

CHECK IMPULSE TUBE

{ISOLATEMAINSPOWER}

Next: p2500, !f2501

CHECK IMPULSE TUBE

{ISOLATEMAINSPOWER}

Next: p2486, !f2487

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2488, !f2489

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2490, !f2491

BURNER CONDITION

{ISOLATEMAINSPOWER}
REMOVE FAN
REMOVE THE BURNER

Next: p2492, !f2493

INSULATION PADS

{ISOLATEMAINSPOWER}
REMOVE FAN AND BURNER

Next: p2494, !f2495

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}

Next: p2496, !f2497

IGNITION ELECTRODE GAP

{ISOLATEMAINSPOWER}

Next: !p2498, !f2499

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: p2502, f2503

RESISTANCE GAS VALVE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2506, f2507

VOLTAGE GAS VALVE AT PCB

{ISOLATEMAINSPOWER}
BOILER ON/OFF SWITCH ON

Next: p2510, !f2511

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p2512, !f2513

BURNER INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2514, !f2515

CAN BOILER BE RESET

Next: p2519, ?2520, ?2522

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: !p2581, !f2579

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2556, f2557

HEAT EXCHANGER TEMP

Next: p2524, f2525

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2539, f2540

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2537, !f2538

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2535, !f2536

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p2533, !f2534

FURTHER INVESTIGATION OVERHEAT

Next: !p2554, !f2555

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2552, !f2553

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2550, !f2551

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p2548, !f2549

FURTHER INVESTIGATION OVERHEAT

Next: !p2576, !f2577

RESISTANCE CONTROL THERMISTORS AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p2562, ?2564, ?2566, ?2568

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2574, !f2575

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2572, !f2573

RESISTANCE DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE INLINE CONNECTOR TO THE DHW THERMISTOR

Next: !p2570, !f2571

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2610, !f2611

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: p2612, !f2613

SENSOR FIXINGS

{ISOLATEMAINSPOWER}

Next: p2614, !f2615

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2616, !f2617

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p2620, !f2619

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: !p2622, !f2621

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2624, !f2625

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT THE FAN HARNESS FROM FAN

Next: p2626, !f2627

SENSOR FIXINGS

{ISOLATEMAINSPOWER}

Next: p2628, !f2629

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2630, !f2631

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p2632, !f2633

RESISTANCE OVERHEAT

{ISOLATEMAINSPOWER}<

Next: !p2634, !f2635

RESISTANCE CONTROL THERMISTOR FLOW

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2637, !f2639

RESISTANCE CONTROL THERMISTOR RETURN

{ISOLATEMAINSPOWER}
REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2640, !f2641

DIVERTER VALVE POSITION (DHW)

BOILER MAINS SWITCH ON
DIVERTER VALVE LOCATED AT THE LOWER LH SIDE OF THE APPLIANCE.

Next: p358, ?1492, ?1494, ?1496

DIVERTER VALVE POSITION (DHW)

BOILER MAINS SWITCH ON
DIVERTER VALVE LOCATED AT THE LOWER LH SIDE OF THE APPLIANCE.

Next: p354, ?1502, ?1504, ?1506

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p1803, !f1806

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p1607, !f1610

PUMP LIMPET

Next: p393, !f396

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAXIMUM

Next: !p394, !f395

SYSTEM BYPASS

Next: !p443, !f444

DIVERTER VALVE POSITION (CH)

BOILER MAINS SWITCH

Next: p462, f1546

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p470, !f467

PUMP LIMPET

Next: p471, !f472

SYSTEM BYPASS

Next: !p473, !f474

CONDENSATE TRAP AND DRAIN

{ISOLATEMAINSPOWER}<

Next: p526, !f527

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAXIMUM

Next: !p528, ?1250, ?1252

BURNER IGNITES

BOILER MAINS SWITCH ON
ENSURE SECONDARY HEAT EXCHANGER IS COOL AND THERE IS A DEMAND FOR PREHEAT

Next: p2382, f2472

RESISTANCE CONTROL THERMISTOR FLOW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p670, f671

RESISTANCE CONTROL THERMISTOR RETURN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p666, f667

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p2584, f663

CAN SYSTEM BE RESET BY POWER OFF/ON

Next: p650, f651

CONTINUITY CHECK ON TERMINAL PINS PCB

{ISOLATEMAINSPOWER}<

Next: !p648, !f649

IS SYSTEM FILLED AND VENTED

{ISOLATEMAINSPOWER}

Next: p656, !f657

RESISTANCE CONTROL THERMISTOR FLUE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE PLUG FROM PCB

Next: !p658, f1236

POWER TO DISPLAY BOARD

{ISOLATEMAINSPOWER}
LOWER MAIN PCB
DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: p1446, !f1449

MAINS VOLTAGE TO PCB

Next: p893, f894

FUSE F1 PCB

{ISOLATEMAINSPOWER}
REMOVE FUSE F1 FROM THE CONTROL BOX

Next: p906, f2301

EMC FILTER VOLTAGE INPUT

LOCATE EMC FILTER

Next: p899, !f900

EMC FILTER VOLTAGE OUTPUT

LOCATE EMC FILTER

Next: !p901, !f902

ON/OFF SWITCH VOLTAGE OUTPUT

{ISOLATEMAINSPOWER}
BOILER MAINS SWITCH ON
REMOVE CONTROL DISPLAY UNIT

Next: p911, f907

OBSERVATION PLUG DISPLAY PCB ON TO MAIN PCB

{ISOLATEMAINSPOWER}<

Next: p1451, f1455

FLAME DETECTION ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}
REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p960, !f961

System Information

  • Total Tests: 843
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control

XSol Diagnostic System - Generated from extracted test data