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:

IDEAL ISAR / EVO HE - GREY DIVERTER VALVE HEAD

GLOBALLY REPLACED

Next: &110, *

NO FAULT FOUND

Next: nff

IDEAL ISAR / EVO HE - GREY DIVERTER VALVE HEAD

BOILER FRONT

Next: &114, !f111

DHW FLOW RATE

Next: &2621, f544

FAN RUNS (PREHEAT)

Next: &325, ?950, ?952

PREHEAT SATISFACTORY

ENSURE SECONDARY HEA

Next: &179, ?309, ?311, ?797, ?1515, ?2709

CH DEMAND

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: &181, f229

DHW OPERATION

BOILER ON OFF SWITCH ON
BOILER DHW THERMOSTAT SET TO MAX

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

DHW BURNER MODULATION

SET THE DHW FLOW RATE AT THE TAP TO APPROXIMATELY 3.0 L/MIN

Next: &209, f1287

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CENTRAL HEATING DEMAND

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

CH BURNER MODULATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: &nff, f222

PUMP RUNS (PREHEAT)

Next: &136, ?237, ?239

BURNER IGNITES (PREHEAT)

Next: &168, ?3088, ?3090

CHOICE FULL DIAG OR FAULT CODE

THIS MODEL CONTAI

Next: &2904, f624

WATER IN IMPULSE TUBE

HEADER FOR IMPULSE TUBE INVESTIGATION

Next: &nff, f2236

POWER UP

Next: &623, f3513

OBSERVATION DOES BOILER RECOGNISE A DEMAND

Next: &236, f2905

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER FOR FUSE INVESTIGATION

Next: &nff, f3551

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

PREHEAT SATISFACTORY

Next: End

PREHEAT INPUT CHECK

INPUT LINK

Next: End

LINK FAULT

INPUT LINK

Next: End

DHW BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

DHW MODULATION

DHW THERMISTOR

Next: End

PUMP RUNS PREHEAT

HARNESS - BOILER WIRING

Next: End

PRE HEAT

LEAD - DETECTION

Next: End

L E FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

LF FAULT99PRE HEATFCDIAG

LEAD - DETECTION

Next: End

LF LE FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

LF FAULT CODE

ELECTRODE - FLAME DETECTION

Next: End

PREHEAT FLAME SENSEFCDIAG

BURNER

Next: End

PREHEAT IGNITES BUT DOES NOT ESTABLISHFCDIAG

FLUE

Next: End

HF FAULTPRE HEATFCDIAG

LEAD - DETECTION

Next: End

HF FAULTFAULT L E FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

RADS COOL CH OP

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

RADS COOL CH OPPREHEAT

DHW THERMISTOR

Next: End

OPEN CIRCUIT FAULT L_E FC DIAG

THERMOSTAT - OVERHEAT

Next: End

PRE HEAT 2

LEAD - DETECTION

Next: End

FAULT L E FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

PASSING CH OPPREHEAT

TAPS

Next: End

OVERHEAT 1

DHW THERMISTOR

Next: End

OVERHEAT

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT 3

DHW THERMISTOR

Next: End

OVERHEAT 3

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 3

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAULTYLARESET

PUMP

Next: End

FAULTYLARESETHA

PUMP

Next: End

OVERHEAT 9

DHW THERMISTOR

Next: End

OVERHEAT 9

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 9

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

POTSOHLARESET

USER CONTROL (DISPLAY UNIT)

Next: End

OVERHEAT PROBLEMOHLARESETH9OH

PLATE - HEAT EXCHANGER

Next: End

O/H SECTION LINK IN SUPPLY CH DEMAND

INPUT LINK

Next: End

OVERHEAT OPERATIONOHLARESETHA

DHW THERMISTOR

Next: End

OVERHEAT 10

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 10

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

POTSOHLARESETHA

USER CONTROL (DISPLAY UNIT)

Next: End

OVERHEAT PROBLEMOHLARESETH9OHHA

PLATE - HEAT EXCHANGER

Next: End

O/H SECTION LINK IN SUPPLY CH DEMAND 2

INPUT LINK

Next: End

PUMP VOLTAGE

PCB - PRIMARY CONTROLS

Next: End

PUMP VOLTAGE 2

PCB - PRIMARY CONTROLS

Next: End

NO PREHEAT

TRAP AND SEAL

Next: End

DRIED ALL WORKING

IMPULSE TUBE WATER INGRES

Next: End

CH BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

WATER

GAS VALVE

Next: End

OVERHEAT 4

DHW THERMISTOR

Next: End

OVERHEAT 4

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 4

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT

SYSTEM FILL AND VENT

Next: End

CLOSED TOO MUCH 4

Next: End

CLOSED TOO MUCH 3

Next: End

FAULT CODE DIAG

FAN

Next: End

FAULT HE

HARNESS FAN

Next: End

L9

SYSTEM FILL AND VENT

Next: End

H_3 FC DIAG PUMP NOT RUNNING STARTUP

DHW THERMISTOR

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - DRY FIRE

Next: End

PUMP RUNS (PREHEAT)

DHW THERMISTOR

Next: End

FC DIAG H_N

POLARITY REVERSAL

Next: End

DHW QUIET OPERATION RADIATORS WARM

CARTRIDGE - DIVERTER VALVE

Next: End

BLOCKED DHW OP

PLATE - HEAT EXCHANGER

Next: End

FLASHES LA OR HA

THERMISTOR - DRY FIRE

Next: End

FLASHES LA OR HA RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

3 DASHES IN DISPLAY

THERMISTOR - DRY FIRE

Next: End

RESETS SHOWS 3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

FLASHES H9 OR L9

THERMISTOR - DRY FIRE

Next: End

FALT CODE LF2

INSULATION - COMBUSTION CHAMBER

Next: End

FAULT CODE LF

HEAT ENGINE

Next: End

PREHEAT SATISFACTORY

CARTRIDGE - DIVERTER VALVE

Next: End

BLOCKED PREHEAT SAT

PLATE - HEAT EXCHANGER

Next: End

CH OPERATION

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION

PUMP

Next: End

RADIATORS COOL BOILER TO TEMPERATURE

Next: End

NO INVESTIGATIONLA

BOILER OVERHEAT

Next: End

NOT RESETLA

THERMOSTAT - OVERHEAT

Next: End

FLASHES LA OR HA WILL NOT RESET

THERMISTOR - DRY FIRE

Next: End

OVERHEAT 5

DHW THERMISTOR

Next: End

OVERHEAT 5

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 5

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

NO INVESTIGATIONLAH9

BOILER OVERHEAT

Next: End

NOT RESETLAH9

THERMOSTAT - OVERHEAT

Next: End

FLASHES LA OR HA WILL NOT RESET 1

THERMISTOR - DRY FIRE

Next: End

OVERHEAT 8

DHW THERMISTOR

Next: End

OVERHEAT 8

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 8

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLAH9

REDIRECTS

Next: End

FLASHES LA OR HA RESETS SHOWS 3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

OVERHEAT 7

DHW THERMISTOR

Next: End

OVERHEAT 7

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 7

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLAH93 DASHES

REDIRECTS

Next: End

SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

OVERHEAT 6

DHW THERMISTOR

Next: End

OVERHEAT 6

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 6

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLA

REDIRECTS

Next: End

RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

OVERHEAT 2

DHW THERMISTOR

Next: End

OVERHEAT 2

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

OVERHEAT 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

RADS TOO COOL BOILER TO TEMP

CARTRIDGE - DIVERTER VALVE

Next: End

RADS COOL CH OP

PCB - PRIMARY CONTROLS

Next: End

DIVERTER VOLTAGE CH OP

PCB - PRIMARY CONTROLS

Next: End

RADS COOL CH OP

DHW THERMISTOR

Next: End

PASSING CH OP

TAPS

Next: End

H THEN F FAULT CODE

LEAD - DETECTION

Next: End

H THEN F FAULT CODE

ELECTRODE - FLAME DETECTION

Next: End

ON WITH NO DEMAND

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

DOES NOT RECOGNISE DEMAND

DHW THERMISTOR

Next: End

PUMP RUNS FOR 5 SECONDS THEN STOPS

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

BOILER FIRING AFTER PREHEAT WITH NO DEMAND

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW MODULATION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

RED DASH FC DIAG

PCB/USER CONTROLS HARNESS

Next: End

DOT DASH FAULT CODE

USER CONTROL (DISPLAY UNIT)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

BURNER ESTABLISHES PRE HEAT

LEAD - DETECTION

Next: End

BURNER ESTABLISHES (PREHEAT)

ELECTRODE - FLAME DETECTION

Next: End

GAP

ELECTRODE - FLAME DETECTION (GAP)

Next: End

BURNER ESTABLISHES (PREHEAT)

TRAP AND SEAL

Next: End

BURNER ESTABLISHES (PREHEAT)

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

INSULATION - COMBUSTION CHAMBER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

HEAT ENGINE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER ESTABLISHES (PREHEAT)

TURRET GASKET

Next: End

SPARKING PRESENT

ELECTRODE - IGNITION (GAP)

Next: End

BURNER DOES NOT IGNITE

IMPULSE TUBE

Next: End

BURNER DOES NOT IGNITE

INJECTOR & HOUSING

Next: End

BURNER DOES NOT IGNITE

TRAP AND SEAL

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

LF CODE

FLUE WAYS

Next: End

FALT CODE LF

INSULATION - COMBUSTION CHAMBER

Next: End

BURNER DOES NOT IGNITE

FLUE WAYS

Next: End

BURNER DOES NOT IGNITE

INSULATION - COMBUSTION CHAMBER

Next: End

LF FAULT CODE

ELECTRODE - IGNITION (GAP)

Next: End

DOES NOT RECOGNISE DEMAND

FAN

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS FAN

Next: End

DAMAGED L8

HARNESS FAN

Next: End

FAN DOES NOT RUN 3 L8

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN 4 L8

PCB - PRIMARY CONTROLS AND FAN

Next: End

POWER FROM PCB L8

HARNESS FAN

Next: End

NO FAN L8

HARNESS FAN

Next: End

FAN DOES NOT RUN L8

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN 2 L8

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN L8

HARNESS FAN

Next: End

DAMAGED

HARNESS FAN

Next: End

FAN DOES NOT RUN 3

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN 4

PCB - PRIMARY CONTROLS AND FAN

Next: End

POWER FROM PCB

HARNESS FAN

Next: End

NO FAN

HARNESS FAN

Next: End

FAN DOES NOT RUN

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN 2

PCB - PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN

HARNESS FAN

Next: End

PREHEAT SATISFACTORY

PCB - PRIMARY CONTROLS

Next: End

PREHEAT SAT RADS WARM NO CH DEMAND

HARNESS - BOILER WIRING

Next: End

STUCK

CARTRIDGE - DIVERTER VALVE

Next: End

DHW QUIET OPERATION RADIATORS WARM

PCB - PRIMARY CONTROLS

Next: End

DHW RADS WARM

HARNESS - BOILER WIRING

Next: End

STUCK 2

CARTRIDGE - DIVERTER VALVE

Next: End

KETTLING

SYSTEM FILL AND VENT

Next: End

NOISY CH

SYSTEM FILL AND VENT

Next: End

DHW OPERATION

THERMOSTAT - OVERHEAT

Next: End

DHW OPERATION

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW OPERATION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

DHW OPERATION

THERMISTOR - DRY FIRE

Next: End

OUT OF CALIBRATION 2

DHW THERMISTOR

Next: End

RESTRICTED OR BLOCKED

TRAP AND SEAL

Next: End

RUNNING SLOW / WEAK

PUMP

Next: End

CLOSED TOO MUCH

Next: End

FAULT LF BURNER DOES NOT IGNITE

IMPULSE TUBE

Next: End

FAULT FURTHER INVESTIGATION LF BURNER DOES NOT IGNITE

THERMOSTAT - OVERHEAT

Next: End

FAULT LF BURNER DOES NOT IGNITE

GAS VALVE

Next: End

OVERHEAT NOT GONE BURNER DOES NOT IGNITE

PCB - PRIMARY CONTROLS

Next: End

RESTRICTED OR BLOCKED BURNER DOES NOT IGNITE

TRAP AND SEAL

Next: End

BURNER DOES NOT IGNITE 2

INJECTOR & HOUSING

Next: End

FAULT LF

IMPULSE TUBE

Next: End

FAULT FURTHER INVESTIGATION LF

THERMOSTAT - OVERHEAT

Next: End

FAULT LF

GAS VALVE

Next: End

OVERHEAT NOT GONE

PCB - PRIMARY CONTROLS

Next: End

RESTRICTED OR BLOCKED 3

TRAP AND SEAL

Next: End

NO GAS DROP

INJECTOR & HOUSING

Next: End

RESTRICTED OR BLOCKED 2

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

INJECTOR & HOUSING

Next: End

RADS COOL CH OP 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

SHUTS DOWN PREMATURELY 2

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION 2

PUMP

Next: End

OPEN TOO MUCH 2

Next: End

PREMATURE SHUTDOWN

USER CONTROL (DISPLAY UNIT)

Next: End

CH OPERATION

TURRET GASKET

Next: End

RESTRICTED OR BLOCKED 8

TRAP AND SEAL

Next: End

RADS TOO COOL BOILER TO TEMP SHUTS DOWN PREMATURELY

CARTRIDGE - DIVERTER VALVE

Next: End

RADS COOL CH OP SHUTS DOWN PREMATURELY

PCB - PRIMARY CONTROLS

Next: End

DIVERTER VOLTAGE CH OP SHUTS DOWN PREMATURELY

PCB - PRIMARY CONTROLS

Next: End

RADS COOL CH OP SHUTS DOWN PREMATURELY

DHW THERMISTOR

Next: End

PASSING CH OP SHUTS DOWN PREMATURELY

TAPS

Next: End

MAINS FUSE INVESTIGATION

REDIRECTS

Next: End

NO POWER POWER UP

Next: End

CONNECTOR FAULT POWER UP

MAINS CONNECTOR

Next: End

POWER UP

FUSE MAIN PCB F1

Next: End

POWER UP

MAINS SWITCH C/W HARNESS

Next: End

BLANK DISPLAY

PCB - PRIMARY CONTROLS AND FAN

Next: End

NO DISPLAY

PCB - PRIMARY CONTROLS AND FAN

Next: End

BLANK DISPLAY

PCB/USER CONTROLS HARNESS

Next: End

FUSE BLOWN 3

HARNESS - BOILER WIRING

Next: End

FUSE F1 BLOWS PREHEAT

FAN

Next: End

FUSE BLOW

GAS VALVE

Next: End

ELECTRICAL SHORT

DIVERTER VALVE HEAD

Next: End

FUSE BLOWN 4

HARNESS - BOILER WIRING

Next: End

DASH DOT

HOUSING - USER CONTROL

Next: End

NOISY

SYSTEM FILL AND VENT

Next: End

H_4 FC DIAG 2

THERMISTOR - DRY FIRE

Next: End

FAULT H4

PCB - PRIMARY CONTROLS

Next: End

FC DIAG H_4 NOT FILLED AND VENTED

SYSTEM FILL AND VENT

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARKING 2

ELECTRODE - IGNITION

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARK

ELECTRODE - IGNITION

Next: End

SPARK GEN BURNER IGNITES PREHEAT 2

PCB - PRIMARY CONTROLS & HARNESS BOILER

Next: End

SPARK GEN BURNER IGNITES PREHEAT 3

PCB - PRIMARY CONTROLS & HARNESS BOILER

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARKING 4

ELECTRODE - IGNITION

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARK 3

ELECTRODE - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARK2

HARNESS - BOILER WIRING

Next: End

BURNER IGNITES PREHEAT NO SPARK2

GAS VALVE

Next: End

BURNER IGNITES PREHEAT NO SPARK

GAS VALVE

Next: End

BURNER IGNITES PREHEAT NO SPARK

HARNESS - BOILER WIRING

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

THERMISTOR - DRY FIRE

Next: End

OUT OF CALIBRATION 3

DHW THERMISTOR

Next: End

POOR DHW

USER CONTROL (DISPLAY UNIT)

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

INJECTOR & HOUSING

Next: End

RESTRICTED OR BLOCKED - POOR DHW

TRAP AND SEAL

Next: End

RESTRICTED POOR DHW

BURNER

Next: End

RESTRICTED FLUEWAYS POOR OUTPUT

BURNER

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

FAN DOES NOT RUN 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAN DOES NOT RUN 2

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

DHW NOISY

HEAT ENGINE

Next: End

DHW OPERATION

PUMP

Next: End

CH NOISY OPERATION

Next: End

PREHEAT SATISFACTORY

TRAP AND SEAL

Next: End

DHW FLOW RATE

FLOW RESTRICTOR

Next: End

H_3 FC DIAG

DHW THERMISTOR

Next: End

H_2 FC DIAG

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAG

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

PRE HEAT IGNITES BUT DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

FAULT CODE L-F

IMPULSE TUBE

Next: End

FAULT CODE L_F

INJECTOR & HOUSING

Next: End

FAULT CODE L_F

TRAP AND SEAL

Next: End

FAULT CODE LF

BURNER

Next: End

INCORRECT POSITION

JUMPER SETTINGS

Next: End

FROM PCB

HARNESS - BOILER WIRING

Next: End

PREHEAT SATISFACTORY

HEAT ENGINE

Next: End

CH INPUT

MULTI FAULT PCB

Next: End

EXTERNAL CONTROL

HARNESS - BOILER WIRING

Next: End

PREHEAT DEMAND

Next: End

EXTERNAL CONTROL

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

CH DEMAND

Next: End

DHW BURNER MODULATION

PCB - PRIMARY CONTROLS

Next: End

PUMP RUNS THEN STOPS

PCB - PRIMARY CONTROLS

Next: End

PRE HEAT STUCK CH OPPREHEAT

PCB - PRIMARY CONTROLS

Next: End

DHW OVERHEAT

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 1

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 3

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 3

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 3

HARNESS - BOILER WIRING

Next: End

PREHAT COMPLET OH LA RESET

PUMP

Next: End

PREHAT COMPLET OH LA RESET HA

PUMP

Next: End

DHW OVERHEAT SECTION OH LA RESET

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 9

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 9

HARNESS - BOILER WIRING

Next: End

RUN OKOH

BOILER OVERHEAT

Next: End

OH SECTIONOHLARESETH9OH

MULTI FAULT PCB

Next: End

FAULTYOHLARESETH9OH

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

O/H SECTION NO REACT TO CH DEMAND

Next: End

DHW OVERHEAT SECTION OH LA RESET HA

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 10

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 10

HARNESS - BOILER WIRING

Next: End

RUN OKOHHA

BOILER OVERHEAT

Next: End

OH SECTIONOHLARESETH9OHHA

MULTI FAULT PCB

Next: End

FAULTYOHLARESETH9OHHA

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

O/H SECTION NO REACT TO CH DEMAND 2

Next: End

OVERHEAT TEMP

PCB - PRIMARY CONTROLS

Next: End

OVERHEAT TEMP 2

PCB - PRIMARY CONTROLS

Next: End

FAN HUNTS

PCB - PRIMARY CONTROLS

Next: End

FAULT H1

PCB - PRIMARY CONTROLS

Next: End

FAULT H2

PCB - PRIMARY CONTROLS

Next: End

FAULT HF

PCB - PRIMARY CONTROLS

Next: End

FAULT LE

PCB - PRIMARY CONTROLS

Next: End

CH BURNER MODULATION

PCB - PRIMARY CONTROLS

Next: End

IMPULSE TUBE

WATER LEAK

Next: End

IMPULSE TUBE

WATER LEAK AND GAS VALVE

Next: End

OVERHEAT TEMP 23 DASHES

PCB - PRIMARY CONTROLS

Next: End

DHW OVERHEAT 4

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 4

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 4

HARNESS - BOILER WIRING

Next: End

CH DEMAND

PCB - PRIMARY CONTROLS

Next: End

NOISY 2

HEAT ENGINE

Next: End

NOISY

HEAT ENGINE

Next: End

FAULT HE

PCB - PRIMARY CONTROLS

Next: End

PUMP RUNS (PREHEAT)

PUMP

Next: End

PUMP NOT RUNNING ON PREHEAT

PCB - PRIMARY CONTROLS

Next: End

DHW FC DIAG PUMP NOT RUNNING STARTUP

HARNESS - BOILER WIRING

Next: End

FAULT CODE H THEN N

PCB - PRIMARY CONTROLS

Next: End

LETBY DHW OPERATION

CARTRIDGE - DIVERTER VALVE

Next: End

DHW QUIET OPERTAION RADIATORS WARM

DIVERTER VALVE HEAD

Next: End

FLASHES LA OR HA

HARNESS - BOILER WIRING

Next: End

FLASHES LA OR HA RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

3 DASHES 1

HARNESS - BOILER WIRING

Next: End

RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR L9

HARNESS - BOILER WIRING

Next: End

HB OR LB FAULT CODE

USER CONTROLS

Next: End

FAULT LF

PCB - PRIMARY CONTROLS

Next: End

ON WITH NO DEMAND

Next: End

LETBY PREHEAT

CARTRIDGE - DIVERTER VALVE

Next: End

STICKING RADS WARM NO CH DEMAND

DIVERTER VALVE HEAD

Next: End

STICKING DHW QUIET RADS WARM

DIVERTER VALVE HEAD

Next: End

RADIATORS COOL, BOILER TO TEMPERATURE

Next: End

RADS WARM NO DEMAND

DIVERTER VALVE HEAD

Next: End

INVESTIGATIONLA

REDIRECTS

Next: End

OVERHEATLA

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMPOVERHEAT 2

PCB - PRIMARY CONTROLS

Next: End

FLASHES LA OR HA WILL NOT RESET

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 5

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 5

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 5

HARNESS - BOILER WIRING

Next: End

INVESTIGATIONLAH9

REDIRECTS

Next: End

OVERHEATLAH9

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMPOVERHEAT 4

PCB - PRIMARY CONTROLS

Next: End

FLASHES LA OR HA WILL NOT RESET 1

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 8

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 8

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 8

HARNESS - BOILER WIRING

Next: End

OVERHEATLAH9

BOILER OVERHEAT

Next: End

OVERHEAT TEMPOVERHEAT 3

PCB - PRIMARY CONTROLS

Next: End

RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 7

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 7

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 7

HARNESS - BOILER WIRING

Next: End

OVERHEATLAH93 DASHES

BOILER OVERHEAT

Next: End

OVERHEAT TEMPOVERHEAT 2 OVERHEAT 4

PCB - PRIMARY CONTROLS

Next: End

3 DASHES

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 6

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 6

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 6

HARNESS - BOILER WIRING

Next: End

OVERHEATLA

BOILER OVERHEAT

Next: End

OVERHEAT TEMP OVERHEAT

PCB - PRIMARY CONTROLS

Next: End

FLASHES LA OR HA RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 2

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION RETURN 2

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION FLOW 2

HARNESS - BOILER WIRING

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS - BOILER WIRING

Next: End

CH OPERATION

DIVERTER VALVE HEAD

Next: End

PRE HEAT STUCK CH OP

PCB - PRIMARY CONTROLS

Next: End

H THEN F FAULT CODE

PCB - PRIMARY CONTROLS

Next: End

ON WITH NO DEMAND

PCB - PRIMARY CONTROLS

Next: End

RED DASH

PCB - PRIMARY CONTROLS

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

PCB - PRIMARY CONTROLS

Next: End

PRESSURE DROPS AWAY

GAS INLET PRESSURE

Next: End

INCORRECT MIX 1

GAS VALVE

Next: End

WRONG MIX 1

GAS VALVE

Next: End

FAN DOESNT RUN L8

PCB - PRIMARY CONTROLS

Next: End

FAN NOT RUN L8

PCB - PRIMARY CONTROLS

Next: End

FAN RUNS (PREHEAT) L8

FAN

Next: End

FAN DOES NOT RUN BLUE PCB L8

PCB - PRIMARY CONTROLS

Next: End

FAN DOES NOT RUN BLUE PCB FITTED L8

PCB - PRIMARY CONTROLS

Next: End

FAN DOES NOT RUN BLUE PCB FITTED L8

FAN

Next: End

FAN DOESNT RUN

PCB - PRIMARY CONTROLS

Next: End

FAN RUNS (PREHEAT)

FAN

Next: End

FAN DOES NOT RUN BLUE PCB

PCB - PRIMARY CONTROLS

Next: End

FAN DOES NOT RUN BLUE PCB FITTED

FAN

Next: End

PREHEAT SATISFACTORY

DIVERTER VALVE HEAD

Next: End

DHW OPERATION

DIVERTER VALVE HEAD

Next: End

BOILER CYCLING

PCB - PRIMARY CONTROLS

Next: End

RESTRICTED OR BLOCKED

PLATE - HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED

HEAT ENGINE

Next: End

FAULT CODE L-F BURNER DOES NOT IGNITE

THERMOSTAT - OVERHEAT

Next: End

FAULT CODE LF BURNER DOES NOT IGNITE

HARNESS - BOILER WIRING

Next: End

MECHANICAL BURNER DOES NOT IGNITE

GAS VALVE

Next: End

FAULT CODE L-F

THERMOSTAT - OVERHEAT

Next: End

FAULT CODE LF

HARNESS - BOILER WIRING

Next: End

MECHANICAL

GAS VALVE

Next: End

WRONG MIX 2

GAS VALVE

Next: End

PREMATURE SHUTDOWN OR BOILER DOESNT FIRE

PCB - PRIMARY CONTROLS

Next: End

CH OPERATION SHUTS DOWN PREMATURELY

DIVERTER VALVE HEAD

Next: End

PRE HEAT STUCK CH OP SHUTS DOWN PREMATURELY

PCB - PRIMARY CONTROLS

Next: End

POWER UP

FUSE MAINS

Next: End

MAINS CONNECTOR PCB POWER UP

HARNESS - BOILER WIRING

Next: End

PCB FUSE INVESTIGATION

REDIRECTS

Next: End

BLANK DISPLAY

HARNESS - BOILER WIRING

Next: End

NO DISPLAY

USER CONTROL (DISPLAY UNIT)

Next: End

NO DISPLAY

PCB - PRIMARY CONTROLS

Next: End

BLANK DISPLAY BLUE PCB FITTED

USER CONTROL (DISPLAY UNIT)

Next: End

BLANK DISPLAY

PCB - PRIMARY CONTROLS

Next: End

BLOWING FUSES

PUMP

Next: End

FUSE BLOWN

HARNESS FAN

Next: End

FUSE BLOWN 2

HARNESS - BOILER WIRING

Next: End

FUSE BLOWN

HARNESS - BOILER WIRING

Next: End

PCB - FUSE BLOWN

PCB - PRIMARY CONTROLS (FUSE)

Next: End

FUSE BLOWN

SPARK GENERATOR

Next: End

BLANK DISPLAY

HOUSING - USER CONTROL

Next: End

FLUE FC DIAG 2

HARNESS - BOILER WIRING

Next: End

FAULT CODE H4

FAULT CODE RESET - RETEST APPLIANCE

Next: End

BLANK DISPLAY

PCB AND FAN HARNESS

Next: End

BLANK DISPLAY 2

PCB AND FAN HARNESS

Next: End

NO SPARKING 2

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK 2

SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK 2

LEAD - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARK

SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK

LEAD - IGNITION

Next: End

NO SPARKING 3

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK 3

SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK 3

LEAD - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARK4

SPARK GENERATOR

Next: End

BURNER IGNITES PREHEAT NO SPARK 4

LEAD - IGNITION

Next: End

NO SPARKING 4

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

FAN RUNS NO SPARK

HARNESS - BOILER WIRING

Next: End

NO SPARKING

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

FAN RUNS NO SPARK 2

HARNESS - BOILER WIRING

Next: End

FAULT H3

DHW SENSOR - PCB

Next: End

DHW NOT RECOGNISED

DHW SENSOR - PCB

Next: End

RESTRICTED OR BLOCKED POOR TEMP RISE

PLATE - HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED POOR TEMP RISE

HEAT ENGINE

Next: End

BOILER CYCLING POOR TEMP RISE

PCB - PRIMARY CONTROLS

Next: End

FAN NOT RUN

PCB - PRIMARY CONTROLS

Next: End

FAN DOES NOT RUN BLUE PCB FITTED

PCB - PRIMARY CONTROLS

Next: End

DHW NOISY

PLATE - HEAT EXCHANGER

Next: End

CH NOISY OPERATION

Next: End

CH OPERATION

EXPANSION VESSEL

Next: End

PREHEAT SATISFACTORY

PLATE - HEAT EXCHANGER

Next: End

DHW FLOW RATE

PLATE - HEAT EXCHANGER

Next: End

DHW FC DIAG

HARNESS - BOILER WIRING

Next: End

RETURN FC DIAG

HARNESS - BOILER WIRING

Next: End

FLOW FC DIAG

HARNESS - BOILER WIRING

Next: End

PREHEATFCDIAG

GAS INLET PRESSURE

Next: End

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

FLASHES H9 OR L9

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

Next: p1825

1 DASH AND/OR DOT

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

Next: p1480

PREHEAT DOES NOT SWITCH OFF OR COMES ON TOO FREQUENTLY, RADS REMAIN COOL

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p1617

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1709

RESETS _SHOWS THREE DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1711

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1756

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1758

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1760

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1828

RESETS _SHOWS THREE DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1830

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1835

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1837

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1839

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2135

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2137

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2139

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p2387

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p2155

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2167

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2169

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2171

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p2369

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p2187

3 DASHES

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

Next: p2245

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2250

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2252

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2254

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

LEVER CYCLES IN AND OUT CONTINUOUSLY

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2540

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p3335

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2563

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2575

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2579

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2591

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2599

HB OR LB (B WILL BE IN LOWER CASE)

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

Next: !p2620

PREHEAT SATISFACTORY - BOILER FIRES WITH NO DEMAND DISPLAY SHOWS C

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2710

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p3328

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2756

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2758

LEVER CYCLES IN AND OUT CONTINUOUSLY

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2785

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2797

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2799

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2801

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2803

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2823

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2825

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2827

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2829

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2844

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2846

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2848

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2850

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2865

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2867

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2869

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2871

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2886

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2888

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2890

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2892

FLASHES H THEN F

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

Next: p2986

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p3092

RADIATORS HEAT UP DURING PREHEAT FUNCTION WITH NO CH DEMAND

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p310

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p3113

BOILER KETTLING

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p3342

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p3189

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p3131

DHW NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3574

DHW TEMPERATURE RISE INSUFFICIENT, RADS BEGIN TO HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2529

BOILER CYCLING

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3366

DHW TEMPERATURE RISE INSUFFICIENT, RADS REMAIN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3743

CH NOISY OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3361

BOILER FIRES FOR CH AND REACHES TEMPERATURE BUT RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1493

BOILER SHUTS DOWN PREMATURELY OR DOES NOT FIRE FOR CH

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3471

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: p1522

FLASHES LA OR HA

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

Next: p1707

FLASHES L THEN 8

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

Next: p3274

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: p3590

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: p1437

FLASHES H THEN N

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

Next: p2523

NOISE WHEN MODULATING DOWN OR COMBUSTION NOISE DURING OPERATION

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p3452

FLASHES H THEN E

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

Next: p2388

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p922

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p929

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p3301

FAN HUNTS RUNS SLOWS RUNS SLOWS

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p1391

29/07/2019 14:40:09 1907_0_50_1 08/08/2019 10:53:08

05/08/2019 14:16:57

Next: End

PUMP VOLTAGE AT PCB

BOILER MAINS SWITCH

Next: !p1241, f2440

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1279, f1276

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1285, !f1286

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1277, !f1278

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p1288, !f1295

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2203, ?1755, ?1757, ?1759, ?2574

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2204, ?1834, ?1836, ?1838, ?2590

PUMP VOLTAGE

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

Next: !p2059, !f2221

PUMP VOLTAGE

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

Next: !p2064, !f2222

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2158, f2159

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p2160, !f2161

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2190, f2191

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p2192, !f2193

POTENTIOMETER RESISTANCE (CH)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: !p223, !f224

REMOVE WATER FROM IMPULSE TUBE DOES BOILER NOW LIGHT

REMOVE WATER INGRESS FROM IMPULSE TUBE
FIT IMPULSE TUBE BACK TO GAS VALVE AND COMBUSTION CHAMBER

Next: p2237, f2240

VISUALLY CHECK FOR WATER LEAKS

Next: !p2241, !f2242

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2248, ?2249, ?2251, ?2253, ?2598

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p230, f231

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1274, f1273

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p2441, f2442

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2443, !f2444

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p2713, !f3001

RESISTANCE OVERHEAT AT PCB

REMOVE THE DIVERTER VALVE CONNECTOR FROM THE PCB
(SITUATED ON THE TOP OF THE PCB)

Next: p2790, f2791

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2792, !f2793

RESISTANCE OVERHEAT AT PCB

REMOVE THE DIVERTER VALVE CONNECTOR FROM THE PCB
(SITUATED ON THE TOP OF THE PCB)

Next: p2816, f2817

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2818, !f2819

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2842, ?2843, ?2845, ?2847, ?2849

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2863, ?2864, ?2866, ?2868, ?2870

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2884, ?2885, ?2887, ?2889, ?2891

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: p3269, f2916

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2917, !f2994

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2973, !f2974

DIVERTER VALVE VOLTAGE (DHW CH OP)

BOILER MAINS SWITCH ON
CH DEMAND

Next: p2977, !f2978

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p3635, f3650

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3277, f3278

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p3279, !f3280

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3285, !f3286

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p3291, !f3292

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3297, !f3298

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3304, f3305

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p3306, !f3307

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: p3774, !f3313

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p3318, !f3319

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: p3780, !f3325

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p3383, f3384

SYSTEM BYPASS

Next: !p3385, !f3386

OVER HEAT OPTION

Next: !p3422, !f3423

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3426, !f3427

OVER HEAT OPTION

Next: !p3440, !f3441

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3444, !f3445

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p3501, !f3502

DIVERTER VALVE VOLTAGE (DHW CH OP)

BOILER MAINS SWITCH ON
CH DEMAND

Next: p3505, !f3506

MAINS VOLTAGE TO PCB

Next: p3514, f3515

FUSE RESISTANCE FUSED SPUR

REMOVE FUSE FROM FUSED SPUR

Next: p3516, f3517

FURTHER INVESTIGATION FUSE (MAINS)

Next: !p3518, !f3519

FURTHER INVESTIGATION FUSE (PCB)

Next: !p3526, !f3527

RESISTANCE ON/OFF SWITCH

DISCONNECT THE ON/OFF SWITCH AT THE INLINE CONNECTOR
(AS HIGHLIGHTED OPPOSITE)

Next: !p3530, !f3531

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p3534, f3535

VOLTAGE AT MAIN PCB

LOWER MAIN PCB
DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p3536, f3537

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p3538, f3539

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3599, !f3541

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p3544, f3545

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3600, !f3547

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: p3552, f3553

RESISTANCE HARNESS PUMP

REMOVE THE CONNECTOR FROM THE PUMP ASSEMBLY
REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: !p3554, !f3555

FAN RESISTANCE

DISCONNECT THE HARNESS FROM FAN

Next: !p3558, !f3559

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3562, !f3563

DIVERTER VALVE RESISTANCE

DISCONNECT THE HARNE

Next: !p3566, !f3567

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3570, !f3571

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p3593, !f3594

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p3651, f3652

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3653, !f3697

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3659, !f3658

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3681, !f3682

RESISTANCE GAS VALVE AND HARNESS - BLUE

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3689, f3694

GAS VALVE RESISTANCE - BLUE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3738, !f3739

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p3700, f3701

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p3702, f3703

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3704, !f3705

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3708, !f3709

RESISTANCE GAS VALVE AND HARNESS - BLUE

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3712, f3713

GAS VALVE RESISTANCE - BLUE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3733, !f3734

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3722, !f3723

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p3760, f3761

SYSTEM BYPASS

Next: !p3762, !f3763

FLOW REGULATOR/FILTER

WATER OFF
DRAIN OFF EXCESS WATER THROUGH HOT TAP

Next: !p545, !f546

WHAT FAULT CODE IS SHOWN

THE FAULT CODES ARE

Next: p625, ?626, ?628, ?630, ?632, ?634, ?636, ?638, ?640, ?642, ?811, ?1225, ?1452, ?1479, ?2243, ?2616, ?2985

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p664, !f665

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p668, !f669

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p672, !f673

SPARKING (PRE HEAT)

Next: p3224, f3699

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3208, !f3211

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1263, f1267

SYSTEM BYPASS

Next: !p1256, !f1257

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p1289, !f3003

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p1291, !f3004

POTENTIOMETER RESISTANCE (DHW)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: !p1293, !f1294

HARNESS CHECK - THERMISTORS

Next: !p1320, !f1321

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p1392, !f1393

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2205, !f1395

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p1410, !f1411

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1426, !f1414

FLAME DETECTION ELECTRODE GAP

REMOVE FAN AND BURNER FROM TOP OF HEAT EXCHANGER

Next: p1428, !f1427

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p1429, !f1430

FLUE

Next: p1431, !f1432

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p1433, !f2224

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2698, !f2699

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p1438, !f1439

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2214, !f1441

RESISTANCE HARNESS USER CONTROL

REMOVE HARNESS FROM PCB AND USER CONTROL

Next: p3007, !f3008

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p1495, !f1494

DIVERTER VALVE POSITION (CH)

BOILER MAINS SWITCH

Next: p2762, f2972

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1627, !f1519

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p1524, !f1523

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p1525, !f1526

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2215, !f1528

DHW INLET VALVE

TURN OFF DHW INLET ISOLATION VALVE

Next: p1517, !f1624

CAN BOILER BE RESET

PRESS THE RESET BUTTON IN THE MIDDLE OF THE USER DISPLAY

Next: p2267, ?1708, ?1710

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2786, f2789

HEAT EXCHANGER TEMP

Next: p1752, f1753

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2880, f2883

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1765, !f1766

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1763, !f1764

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1761, !f1762

PUMP RUNS

BOILER MAINS SWITCH

Next: p2021, f2058

CAN BOILER BE RESET

PRESS THE RESET BUTTON IN THE MIDDLE OF THE USER DISPLAY

Next: p2398, ?1827, ?1829

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2812, f2815

HEAT EXCHANGER TEMP

Next: p1831, f1832

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2838, f2841

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p1844, !f1845

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p1842, !f1843

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1840, !f1841

PUMP LIMPET

Next: p2132, !f2023

PUMP RUNS

BOILER MAINS SWITCH

Next: p2062, f2063

PUMP LIMPET

Next: p2164, !f2067

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p2133, ?2134, ?2136, ?2138, ?2561

POTENTIOMETER RESISTANCE (DHW)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: p2146, !f2147

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2144, !f2145

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2142, !f2143

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2140, !f2141

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
TURN HW STAT TO MAX

Next: p2370, !f2149

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: !p2150, ?2152, ?2154

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2156, f2157

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p2165, ?2166, ?2168, ?2170, ?2578

POTENTIOMETER RESISTANCE (DHW)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: p2178, !f2179

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2176, !f2177

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2174, !f2175

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2172, !f2173

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
TURN HW STAT TO MAX

Next: p2352, !f2181

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: !p2182, ?2184, ?2186

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2188, f2189

VISUALLY CHECK FOR WATER LEAKS

Next: !p2238, !f2239

HEAT EXCHANGER TEMP

Next: p2246, f2247

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2859, f2862

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2259, !f2260

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2257, !f2258

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2255, !f2256

IS SYSTEM FILLED AND VENTED

Next: p1785, !f2307

SYSTEM BYPASS

Next: p2180, !f2367

SYSTEM BYPASS

Next: p2148, !f2385

PUMP VOLTAGE

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

Next: !p241, f1240

FAN RESISTANCE

DISCONNECT THE HARNESS FROM FAN

Next: p2389, !f2390

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p2391, !f2392

IS SYSTEM FILLED AND VENTED

Next: p2061, !f2438

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p244, !f3000

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p246, !f2993

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p248, !f249

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p1319, !f251

VOLTAGE POLARITY

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

Next: !p2524, !f2525

DIVERTER VALVE POSITION (DHW)

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

Next: p2530, ?2539, ?2546, ?2757

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2531, !f2532

SECONDARY HEAT EXCHANGER

ENSURE SECONDARY HEA

Next: !p2533, !f2534

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2564, !f2565

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2608, !f2609

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2610, !f2611

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2592, !f2593

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2600, !f2601

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2700, !f2708

DISCONNECT EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROLS AND MAKE SAFE

Next: !p2711, f2712

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2991, !f2992

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2735, !f2736

OBSERVATION DOES PREHEAT COMPLETE

ENSURE SECONDARY HEA

Next: !p2737, !f2738

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2763, !f2764

PUMP LIMPET

Next: p2765, !f2766

SYSTEM BYPASS

Next: !p2767, !f2768

FURTHER INVESTIGATION OVERHEAT

Next: !p2787, !f2788

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2794, ?2796, ?2798, ?2800, ?2802

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2810, !f2811

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2808, !f2809

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2806, !f2807

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2804, !f2805

FURTHER INVESTIGATION OVERHEAT

Next: !p2813, !f2814

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2820, ?2822, ?2824, ?2826, ?2828

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2836, !f2837

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2834, !f2835

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2832, !f2833

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2830, !f2831

FURTHER INVESTIGATION OVERHEAT

Next: !p2839, !f2840

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2857, !f2858

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2855, !f2856

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2853, !f2854

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2851, !f2852

FURTHER INVESTIGATION OVERHEAT

Next: !p2860, !f2861

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2878, !f2879

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2876, !f2877

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2874, !f2875

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2872, !f2873

FURTHER INVESTIGATION OVERHEAT

Next: !p2881, !f2882

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: !p2899, !f2900

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p2897, !f2898

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2895, !f2896

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2893, !f2894

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p2975, f2976

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p2979, !f2980

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p2981, !f2982

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p2983, !f2984

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2987, !f2988

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2989, !f2990

RESISTANCE USER CONTROL INTERFACE

Next: p3009, !f3573

INSPECTION DISPLAY PCB CONNECTIONS

REMOVE THE DISPLAY PCB

Next: !p3011, !f3012

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p3093, !f3094

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p3095, !f3096

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p3097, !f3098

FLAME DETECTION ELECTRODE GAP

REMOVE FAN AND BURNER FROM TOP OF HEAT EXCHANGER

Next: p3099, !f3100

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3101, !f3102

DIVERTER VALVE POSITION (DHW)

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

Next: p2734, ?2749, ?2754, ?2784

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3103, !f3104

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3105, !f3106

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p3107, !f3108

FLUE

Next: p3109, !f3110

PRIMARY FLUE SEAL

Next: !p3111, !f3112

SPARKING (PRE HEAT)

Next: p3114, f3115

IGNITION ELECTRODE GAP

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p3124, !f3165

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3417, ?3128, ?3130

CHECK IMPULSE TUBE

Next: p3132, !f3166

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p3134, !f3167

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3136, !f3168

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3138, !f3169

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3213, !f3216

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3209, !f3210

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3214, !f3215

IGNITION ELECTRODE GAP

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p919, !f3255

OBSERVATION DISCONNECT FAN - DEMAND RECOGNISED?

REMOVE CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p3270, !f3271

OBSERVATION DISCONNECT FAN HARNESS - DEMAND RECOGNISED?

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p3742, !f3273

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p3275, f3276

VOLTAGE PERMANENT FAN HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3289, f3290

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p3283, f3284

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3281, !f3282

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p3287, !f3288

VOLTAGE FAN AT PCB

DISCONNECT DHW THERM

Next: p3295, f3296

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3293, !f3294

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p3299, !f3300

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p3302, f3303

VOLTAGE PERMANENT FAN HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3316, f3317

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p3310, f3311

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3308, !f3309

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p3314, !f3315

VOLTAGE FAN AT PCB

DISCONNECT DHW THERM

Next: p3322, f3323

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3320, !f3321

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p3326, !f3327

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p3329, !f3334

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON

Next: p3330, !f3331

RESISTANCE DIVERTER HARNESS

REMOVE THE 12 WAY CO

Next: !p3332, !f3333

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p3336, !f3341

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON

Next: p3337, !f3338

RESISTANCE DIVERTER HARNESS

REMOVE THE 12 WAY CO

Next: !p3339, !f3340

IS SYSTEM FILLED AND VENTED

Next: p525, !f3360

IS SYSTEM FILLED AND VENTED

Next: p438, !f3365

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3367, !f3368

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p3369, !f3370

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p3371, !f3372

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p3373, !f3374

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3375, !f3376

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3377, !f3378

PUMP LIMPET

Next: p3379, !f3380

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP ON

Next: !p3381, f3382

CHECK IMPULSE TUBE

Next: p3418, !f3419

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3420, f3421

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3424, f3425

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p3428, !f3429

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3430, !f3431

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3432, !f3433

CHECK IMPULSE TUBE

Next: p3436, !f3437

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3438, f3439

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3442, f3443

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p3446, !f3447

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3448, !f3449

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3450, !f3451

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3453, !f3454

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p3455, !f3456

CHECK IMPULSE TUBE

Next: p3457, !f3458

FLUE

Next: p3459, !f3460

PRIMARY FLUE SEAL

Next: p3461, !f3462

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3463, !f3464

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3465, !f3466

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p3467, !f3468

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3469, !f3470

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p3472, !f3473

DIVERTER VALVE POSITION (CH)

BOILER MAINS SWITCH

Next: p3474, f3500

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p3488, !f3489

PUMP LIMPET

Next: p3490, !f3491

SYSTEM BYPASS

Next: p3492, !f3493

POTENTIOMETER RESISTANCE (CH)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: p3494, !f3495

PRIMARY FLUE SEAL

Next: p3496, !f3497

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: !p3498, !f3499

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p3503, f3504

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p3507, !f3508

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3509, !f3510

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p3511, !f3512

FUSE F1 PCB

REMOVE FUSE F1 FROM THE CONTROL BOX

Next: p3524, f3525

MAINS CONNECTOR INPUT

Next: p3520, !f3521

MAINS CONNECTOR OUTPUT

Next: !p3522, !f3523

RESISTANCE ON/OFF SWITCH AND HARNESS

LOWER THE PCB
REM

Next: p3528, f3529

OBSERVATION PLUG DISPLAY PCB ON TO MAIN PCB - DOES DISPLAY ILLUMINATE

DISCONNECT THE HARNE

Next: p3532, f3533

RESISTANCE HARNESS USER CONTROL

REMOVE HARNESS FROM PCB AND USER CONTROL

Next: !p3572, !f3549

VOLTAGE MAIN PCB

DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p3542, f3543

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: p3556, f3557

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3560, f3561

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE THE DIVERTER VALVE CONNECTOR FROM THE PCB

Next: p3564, f3565

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE SPARK GENERATOR CONNECTOR FROM THE PCB

Next: !p3568, f3569

IS SYSTEM FILLED AND VENTED

Next: p392, !f3580

RESISTANCE DRY FIRE THERMISTOR AND HARNESS

ENSURE BOILER IS COOL
REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p3591, f3592

CAN SYSTEM BE RESET BY POWER OFF/ON

Next: p3595, !f3596

IS SYSTEM FILLED AND VENTED

Next: !p3597, !f3598

VOLTAGE AT SPARK GENERATOR - BLUE

USE INSULATION MAT AS REQUIRED

Next: p3678, f3688

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p3655, f3656

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p3679, f3680

HARNESS CONTINUITY PCB TO SPARK GEN- BLUE

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3735, !f3740

VOLTAGE AT SPARK GENERATOR - BLUE

USE INSULATION MAT AS REQUIRED

Next: p3710, f3711

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p3706, f3707

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p3720, f3721

HARNESS CONTINUITY PCB TO SPARK GEN- BLUE

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3730, !f3732

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p3744, !f3745

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: p3746, !f3747

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p3748, !f3749

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3750, !f3751

POTENTIOMETER RESISTANCE (DHW)

DISCONNECT AND REMOVE THE USER CONTROL (DISPLAY UNIT)
REMOVE THE FRONT COVER

Next: p3752, !f3753

PUMP LIMPET

Next: p3754, !f3755

PRESSURE GAS INLET (DHW)

ATTACH U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT
TURN HOT WATER TAP ON

Next: p3756, !f3757

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP ON

Next: p3758, f3759

TEMPERATURE DHW AT APPLIANCE AND OUTLET (MIXER TAP PASSING)

Next: p3764, !f3765

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p3766, !f3767

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p3768, !f3769

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3770, !f3771

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3772, !f3773

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p3777, !f3776

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p3778, !f3779

RESISTANCE CONTROL THERMISTOR FLOW

REMOVE ONE OR BOTH OF THE RED LEADS FROM THE CONTROL THERMISTOR

Next: p3781, !f3782

RESISTANCE CONTROL THERMISTOR RETURN

REMOVE ONE OR BOTH OF THE PINK LEADS FROM THE RETURN THERMISTOR

Next: !p3783, !f3784

PUMP LIMPET

Next: p393, !f396

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CENTRAL HEATING DEMAND

Next: !p394, !f395

SYSTEM BYPASS

Next: !p443, !f444

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p526, !f527

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CENTRAL HEATING DEMAND

Next: !p528, ?1250, ?1252

BURNER IGNITES LF

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

Next: p678, f679

RESISTANCE CONTROL THERMISTOR FLOW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p2207, f671

RESISTANCE CONTROL THERMISTOR RETURN AND HARNESS

REMOVE PLUG FROM PCB

Next: !p2208, f667

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p3741, f663

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p1409, !f703

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3435, ?921, ?923

CHECK IMPULSE TUBE

Next: p930, !f931

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p936, !f937

CONDENSATE TRAP AND DRAIN

CONDENSATE TRAP IS LOCATED LOWER L/H SIDE OF THE APPLIANCE BEHIND THE GAS VALVE

Next: p938, !f939

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p1210, !f941

System Information

Total Tests: 927

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control