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 HE + PROGRAMMER / ESPRIT 2 (BLACK DIVERTER VALVE HEAD)

GLOBALLY REPLACED

Next: &110, *

NO FAULT FOUND

Next: nff

IDEAL ISAR HE + PROGRAMMER / ESPRIT 2 (BLACK DIVERTER VALVE HEAD)


BOILER FRONT

Next: &114, !f111

DHW FLOW RATE

Next: &599, f544

FAN RUNS (PREHEAT)

Next: &325, ?950, ?952

PREHEAT SATISFACTORY

ENSURE SECONDARY HEA

Next: &179, ?309, ?311, ?797, ?1515, ?2775

CH DEMAND

BOILER MAINS SWITCH

Next: &181, f229

DHW OPERATION

BOILER ON/OFF SWITCH ON
DHW TEMPERATURE 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
SET DHW TEMPERATURE TO MAX

Next: &209, f1287

CH OPERATION

BOILER MAINS SWITCH ON
CH TEMPERATURE TO MAX
CH DEMAND

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

CH BURNER MODULATION

BOILER MAINS SWITCH ON
BOILER CH TEMPERATURE SET TO MAX
CH DEMAND

Next: &nff, !f2560

PUMP RUNS (PREHEAT)

INTEGRAL TIMER SET TO DHW ON AND CH OFF

Next: &136, ?237, ?239

BURNER IGNITES (PREHEAT)

Next: &168, ?2904, ?2906

POWER UP

Next: &623, f1352

CHOICE FULL DIAG OR FAULT CODE

THIS MODEL CONTAI

Next: &2689, f624

WATER IN IMPULSE TUBE

OUT OF MODEL

Next: &nff, f2236

OBSERVATION DOES BOILER RECOGNISE A DEMAND

INTEGRAL TIMER SET TO DHW ON AND CH OFF

Next: &236, f2690

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER FOR FUSE INVESTIGATION

Next: &nff, f3427

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

LINK FAULT

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

DHW MODULATION

DHW THERMISTOR

Next: End

PUMP RUNS PREHEAT

HARNESS - BOILER WIRING

Next: End

NO POWER POWER UP

Next: End

CONNECTOR FAULT POWER UP

MAINS CONNECTOR

Next: End

99PRE HEATFCDIAG

LEAD - DETECTION

Next: End

FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

LF FAULT99PRE HEATFCDIAG

LEAD - DETECTION

Next: End

FAULT CODE DIAGNOSIS 2

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 OPPREHEAT

DHW THERMISTOR

Next: End

OPEN CIRCUIT FAULT L_E FC DIAG

THERMOSTAT - OVERHEAT

Next: End

PRE HEATFCDIAG

LEAD - DETECTION

Next: End

FAULT L E FAULT CODE DIAGNOSIS

ELECTRODE - FLAME DETECTION

Next: End

PASSING CH OPPREHEAT

TAPS

Next: End

OVERHEAT

DHW THERMISTOR

Next: End

OVERHEAT SECTION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT 3

DHW THERMISTOR

Next: End

OVERHEAT SECTION 3

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 3

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAULTYLARESET

PUMP

Next: End

FAULTYLARESETHA

PUMP

Next: End

OVERHEAT 9

DHW THERMISTOR

Next: End

OVERHEAT SECTION 9

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 9

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT 10

DHW THERMISTOR

Next: End

OVERHEAT SECTION 10

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 10

THERMISTOR - BOILER CONTROL (FLOW)

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

WATER

GAS VALVE

Next: End

OVERHEAT 4

DHW THERMISTOR

Next: End

OVERHEAT SECTION 4

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 4

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT

SYSTEM FILL AND VENT

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 - BOILER CONTROL (FLOW)

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - DRY FIRE

Next: End

PUMP RUNS (PREHEAT)

DHW THERMISTOR

Next: End

OVERHEAT PROBLEMOHLARESETH9OH

PLATE - HEAT EXCHANGER

Next: End

NOISE

Next: End

O/H SECTION LINK IN SUPPLY CH DEMAND OH LA RESET H9 OH

MULTI FAULT INPUT LINK

Next: End

OVERHEAT PROBLEMOHLARESETH9OHHA

PLATE - HEAT EXCHANGER

Next: End

NOISE 2

Next: End

O/H SECTION LINK IN SUPPLY CH DEMAND OH LA RESET H9 OH HA

MULTI FAULT INPUT LINK

Next: End

CH BURNER MODULATION

PCB PRIMARY CONTROLS

Next: End

STOPPING PREHEAT

PCB DISPLAY BOARD

Next: End

STOPPING CH DEMAND

PCB DISPLAY BOARD

Next: End

POWER UP

MAINS SWITCH C/W HARNESS

Next: End

NO INVESTIGATIONLA

BOILER OVERHEAT

Next: End

NOT RESETLA

THERMOSTAT - OVERHEAT

Next: End

OVERHEAT 5

DHW THERMISTOR

Next: End

OVERHEAT SECTION 5

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 5

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLA

REDIRECTS

Next: End

OVERHEAT 2

DHW THERMISTOR

Next: End

OVERHEAT SECTION 2

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FC DIAG H_N

POLARITY REVERSAL

Next: End

NO INVESTIGATION LA H9

BOILER OVERHEAT

Next: End

NOT RESETLAH9

THERMOSTAT - OVERHEAT

Next: End

OVERHEAT 8

DHW THERMISTOR

Next: End

OVERHEAT SECTION 8

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 8

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLAH9

REDIRECTS

Next: End

OVERHEAT 7

DHW THERMISTOR

Next: End

OVERHEAT SECTION 7

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 7

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEATLAH93 DASHES

REDIRECTS

Next: End

OVERHEAT 6

DHW THERMISTOR

Next: End

OVERHEAT SECTION 6

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC 6

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DOES NOT RECOGNISE DEMAND

DHW THERMISTOR

Next: End

FALT CODE LF2

INSULATION COMBUSTION CHAMBER

Next: End

FAULT CODE LF

HEAT ENGINE

Next: End

H THEN F OR L THEN F DOT

LEAD - DETECTION

Next: End

H THEN F OT L THEN F DOT

ELECTRODE - FLAME DETECTION

Next: End

ON WITH NO DEMAND

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

ON WITH NO DEMAND

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

RESETS SHOWS 3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

FLASHES H9 OR L9

THERMISTOR - DRY FIRE

Next: End

FLASHES H9 OR L9 WILL NOT RESET

THERMISTOR - DRY FIRE

Next: End

FLASHES LA OR HA RESETS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

FLASHES H9 OR L9 RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

3 DASHES IN DISPLAY

THERMISTOR - DRY FIRE

Next: End

FLASHES LA OR HA

THERMISTOR - DRY FIRE

Next: End

FLASHES LA OR HA WILL NOT RESET

THERMISTOR - DRY FIRE

Next: End

RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

DOT DASH FAULT CODE

KIT HOUSING - USER CONTROL

Next: End

RED DASH FC DIAG

PCB/USER CONTROL HARNESS

Next: End

DOT DASH FAULT CODE

PCB DISPLAY BOARD

Next: End

BURNER IGNITES (PREHEAT)

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 IGNITES (PREHEAT)

TRAP AND SEAL

Next: End

BURNER IGNBURNER ESTABLISHES (PREHEAT)

BURNER

Next: End

BURNER DOES NOT ESTABLISH

INSULATION COMBUSTION CHAMBER

Next: End

BURNER IGNBURNER ESTABLISH

HEAT ENGINE

Next: End

BURNER IGNITES (PREHEAT)

FLUE

Next: End

BURNER ESTABLISHES (PREHEAT)

TURRET GASKET

Next: End

NO DISPLAY

PCB PRIMARY CONTROLS AND FAN

Next: End

POWER UP

PCB/USER CONTROL HARNESS

Next: End

FUSE INVESTIGATION

REDIRECTS

Next: End

POWER UP

FUSE MAIN PCB F1

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARKNICK

ELECTRODE - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARKNICK

PCB PRIMARY CONTROLS

Next: End

SPARK GEN BURNER IGNITES PREHEATNICK

HARNESS - BOILER WIRING

Next: End

LF FAULT CODE

ELECTRODE - IGNITION (GAP)

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

FALT CODE LF

INSULATION COMBUSTION CHAMBER

Next: End

LF CODE

FLUE WAYS

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

DOES NOT RECOGNISE DEMAND

FAN

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS FAN

Next: End

DAMAGED

HARNESS FAN

Next: End

FAN DOES NOT RUN 3

PCB PRIMARY CONTROLS AND 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

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

BURNER DOES NOT IGNITE

INSULATION COMBUSTION CHAMBER

Next: End

BURNER DOES NOT IGNITE

FLUE WAYS

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

KETTLING

SYSTEM FILL AND VENT

Next: End

PREHEAT SATISFACTORY

TRAP AND SEAL

Next: End

PREHEAT SATISFACTORY

Next: End

PREHEAT INPUT CHECK

MULTI FAULT INPUT LINK

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

NOISY

SYSTEM FILL AND VENT

Next: End

DHW OPERATION

PUMP

Next: End

DHW NOISY

HEAT ENGINE

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

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

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

NOISY CH

SYSTEM FILL AND VENT

Next: End

CH NOISY OPERATION

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

VALVE HEAD

Next: End

FUSE BLOWN 4

HARNESS - BOILER WIRING

Next: End

PREHEAT SATISFACTORY

PCB PRIMARY CONTROLS

Next: End

PREHEAT SATISFACTORY

CARTRIDGE - DIVERTER VALVE

Next: End

BLOCKED PREHEAT SAT

PLATE - HEAT EXCHANGER

Next: End

DHW QUIET OPERATION RADIATORS WARM

PCB PRIMARY CONTROLS

Next: End

DHW QUIET OPERATION RADIATORS WARM

CARTRIDGE - DIVERTER VALVE

Next: End

BLOCKED DHW OP

PLATE - HEAT EXCHANGER

Next: End

RADS COOL CH OP

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

CH OPERATION

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION

PUMP

Next: End

RADIATORS COOL BOILER TO TEMPERATURE

Next: End

RADS COOL CH OP 2

THERMISTOR - BOILER CONTROL (FLOW)

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

SHUTS DOWN PREMATURELY 2

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION 2

PUMP

Next: End

OPEN TOO MUCH 2

Next: End

CH OPERATION

TURRET GASKET

Next: End

RESTRICTED OR BLOCKED 8

TRAP AND SEAL

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

SPARK GEN BURNER IGNITES PREHEAT 2

PCB AND HARNESS BOILER WIRING

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARKING 2

ELECTRODE - IGNITION

Next: End

FAN DOES NOT RUN 4

PCB PRIMARY CONTROLS AND FAN

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

POWER FROM PCB

HARNESS FAN

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

PREHEATIGNITES BUT DOES NOT ESTABLISHFCDIAG

GAS INLET PRESSURE

Next: End

INCORRECT POSITION

JUMPER SETTINGS

Next: End

FROM PCB

HARNESS - BOILER WIRING

Next: End

EXTERNAL CONTROL

HARNESS - BOILER WIRING

Next: End

CH DEMAND

Next: End

PUMP RUNS THEN STOPS

PCB PRIMARY CONTROLS

Next: End

MAINS CONNECTOR PCB POWER UP

HARNESS - BOILER WIRING

Next: End

PRE HEAT STUCK CH OPPREHEAT

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 1

HARNESS - BOILER WIRING

Next: End

FLOW FC 1

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT 3

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 3

HARNESS - BOILER WIRING

Next: End

FLOW FC 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 9

HARNESS - BOILER WIRING

Next: End

FLOW FC 9

HARNESS - BOILER WIRING

Next: End

DHW OVERHEAT SECTION OH LA RESET HA

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 10

HARNESS - BOILER WIRING

Next: End

FLOW FC 10

HARNESS - BOILER WIRING

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

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 4

HARNESS - BOILER WIRING

Next: End

FLOW FC 4

HARNESS - BOILER WIRING

Next: End

FAULT HE

PCB PRIMARY CONTROLS

Next: End

PUMP RUNS (PREHEAT)

PUMP

Next: End

DHW FC DIAG PUMP NOT RUNNING STARTUP

HARNESS - BOILER WIRING

Next: End

RUN OK OH

BOILER OVERHEAT

Next: End

PREHEAT NOISY OH LA RESET H 9OH

HEAT ENGINE

Next: End

OH SECTION OH LA RESET H9 OH

MULTI FAULT PCB

Next: End

FAULTY OH LA RESET H9 OH

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

O/H SECTION NO REACT TO CH DEMAND OH LA RESET H9 OH

Next: End

RUN OK OH HA

BOILER OVERHEAT

Next: End

PREHEAT NOISY OH LA RESET H9 OH HA

HEAT ENGINE

Next: End

OH SECTION OH LA RESET H9 OH HA

MULTI FAULT PCB

Next: End

FAULTY OH LA RESET H9 OH HA

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

O/H SECTION NO REACT TO CH DEMAND OH LA RESET H9 OH HA

Next: End

DHW BURNER MODULATION

PCB PRIMARY CONTROLS

Next: End

PUMP NOT RUNNING ON PREHEAT

PCB PRIMARY CONTROLS

Next: End

CH DEMAND

PCB PRIMARY CONTROLS

Next: End

POWER UP

HARNESS - BOILER WIRING

Next: End

INVESTIGATIONLA

REDIRECTS

Next: End

OVERHEATLA

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMPOVERHEAT 2

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT 5

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 5

HARNESS - BOILER WIRING

Next: End

FLOW FC 5

HARNESS - BOILER WIRING

Next: End

OVERHEAT LA

BOILER OVERHEAT

Next: End

OVERHEAT TEMP OVERHEAT

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT 2

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 2

HARNESS - BOILER WIRING

Next: End

FLOW FC 2

HARNESS - BOILER WIRING

Next: End

FAULT CODE H THEN N

PCB PRIMARY CONTROLS

Next: End

INVESTIGATIONLAH9

REDIRECTS

Next: End

OVERHEATLAH9

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMPOVERHEAT 4

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT 8

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 8

HARNESS - BOILER WIRING

Next: End

FLOW FC 8

HARNESS - BOILER WIRING

Next: End

OVERHEAT LA H9

BOILER OVERHEAT

Next: End

OVERHEAT TEMPOVERHEAT 3

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT 7

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 7

HARNESS - BOILER WIRING

Next: End

FLOW FC 7

HARNESS - BOILER WIRING

Next: End

OVERHEAT LA H9 3 DASHES

BOILER OVERHEAT

Next: End

OVERHEAT TEMPOVERHEAT 2 OVERHEAT 4

PCB PRIMARY CONTROLS

Next: End

DHW OVERHEAT 6

HARNESS - BOILER WIRING

Next: End

OVERHEAT SECTION 6

HARNESS - BOILER WIRING

Next: End

FLOW FC 6

HARNESS - BOILER WIRING

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS - BOILER WIRING

Next: End

FAULT LF

PCB PRIMARY CONTROLS

Next: End

H THE F OR L THEN F DOT

PCB PRIMARY CONTROLS

Next: End

ON WITH NO DEMAND

Next: End

ON WITH NO DEMAND

PCB PRIMARY CONTROLS

Next: End

RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR L9

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR L9 WILL NOT RESET

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR L9 RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR LR RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

3 DASHES IN DISPLAY

HARNESS - BOILER WIRING

Next: End

FLASHES LA OR HA

HARNESS - BOILER WIRING

Next: End

FLASHES LA OR HA WILL NOT RESET

HARNESS - BOILER WIRING

Next: End

RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

RED DASH

PCB PRIMARY CONTROLS

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

PCB PRIMARY CONTROLS

Next: End

NO DISPLAY

PCB DISPLAY BOARD

Next: End

BLANK DISPLAY

PCB PRIMARY CONTROLS

Next: End

BLANK DISPLAY

KIT HOUSING - USER CONTROL

Next: End

POWER UP

FUSE MAINS

Next: End

PCB FUSE INVESTIGATION

REDIRECTS

Next: End

BURNER IGNITES PREHEAT NO SPARKNICK

LEAD - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARKNICK

SPARK GENERATOR

Next: End

PREHEATFCDIAG

GAS INLET PRESSURE

Next: End

INCORRECT MIX 1

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

FAN DOESNT RUN

PCB PRIMARY CONTROLS

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

PRESSURE DROPS AWAY

GAS INLET PRESSURE

Next: End

WRONG MIX 1

GAS VALVE

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

PREHEAT SATISFACTORY

PLATE - HEAT EXCHANGER

Next: End

PREHEAT SATISFACTORY

HEAT ENGINE

Next: End

CH INPUT

MULTI FAULT PCB

Next: End

EXTERNAL CONTROL

MULTI FAULT HARNESS EXTERNAL CONTROL PCB

Next: End

PREHEAT DEMAND

Next: End

WRONG MIX 2

GAS VALVE

Next: End

DHW NOISY

PLATE - HEAT EXCHANGER

Next: End

BOILER CYCLING

PCB PRIMARY CONTROLS

Next: End

RESTRICTED OR BLOCKED

PLATE - HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED

HEAT ENGINE

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

CH NOISY OPERATION

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

STICKING RADS WARM NO CH DEMAND

VALVE HEAD

Next: End

PREHEAT SATISFACTORY

VALVE HEAD

Next: End

PREHEAT SATISFACTORY

HARNESS - BOILER WIRING

Next: End

LETBY PREHEAT

CARTRIDGE - DIVERTER VALVE

Next: End

STICKING DHW QUIET RADS WARM

VALVE HEAD

Next: End

DHW OPERATION

VALVE HEAD

Next: End

DHW RADS WARM

HARNESS - BOILER WIRING

Next: End

LETBY DHW OPERATION

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION

VALVE HEAD

Next: End

PRE HEAT STUCK CH OP

PCB PRIMARY CONTROLS

Next: End

RADIATORS COOL, BOILER TO TEMPERATURE

Next: End

CH OPERATION SHUTS DOWN PREMATURELY

VALVE HEAD

Next: End

PRE HEAT STUCK CH OP SHUTS DOWN PREMATURELY

PCB PRIMARY CONTROLS

Next: End

PREMATURE SHUTDOWN OR BOILER DOESNT FIRE

PCB PRIMARY CONTROLS

Next: End

FLUE FC DIAG 2

HARNESS - BOILER WIRING

Next: End

FAULT CODE H4

FAULT CODE RESET - RETEST APPLIANCE

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

FAULT H3

DHW SENSOR - PCB

Next: End

DHW NOT RECOGNISED

DHW SENSOR - PCB

Next: End

BLANK DISPLAY

PCB AND FAN HARNESS

Next: End

FAN NOT RUN

PCB PRIMARY CONTROLS

Next: End

FAN RUNS (PREHEAT)

FAN

Next: End

CH OPERATION

EXPANSION VESSEL

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

FLASHES H THEN 5

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

Next: !p1226

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

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

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

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p2532

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p2534

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p2550

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p2552

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2600

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2602

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2604

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2617

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2619

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2621

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2642

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2644

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2646

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2659

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2661

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2663

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2676

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2678

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2680

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: p2770

PREHEAT SATISFACTORY - BOILER FIRES WITH NO DEMAND RAD SYMBOL IN DISPLAY

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2776

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2824

DRY FIRE 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: p2830

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2803

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2806

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2809

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2812

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2815

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2818

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2821

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p2905

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p3191

RADIATORS HEAT UP DURING PREHEAT FUNCTION WITH NO CH DEMAND

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p3453

BOILER KETTLING

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p3256

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p3129

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p3131

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p3207

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p3209

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM GAS FLOW

Next: p3264

BOILER KETTLES

CHARACTERISTIC TEST FROM GAS FLOW

Next: p3266

DHW NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3294

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p3456

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p3458

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p3470

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p3472

DHW TEMPERATURE RISE INSUFFICIENT, RADS BEGIN TO HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3467

BOILER CYCLING

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3319

DHW TEMPERATURE RISE INSUFFICIENT, RADS REMAIN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p3340

CH NOISY OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3369

BOILER FIRES FOR CH AND REACES TEMPERATURE BUT RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3481

BOILER SHUTS DOWN PREMATURELY OR DOES NOT FIRE FOR CH

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3504

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: p3178

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: p3538

FLASHES H THEN 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: p2628

NOISE WHEN MODULATING DOWN OR COMBUSTION NOISE DURING OPERATION

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p3275

FLASHES H THEN E

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

Next: p2388

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p3165

FAN HUNTS RUNS SLOWS RUNS SLOWS

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p1391

02/08/2019 10:23:51 1907_0_50_1 08/08/2019 11:01:00

05/08/2019 14:19:05

Next: End

PUMP VOLTAGE AT PCB

ENSURE SECONDARY HEAT EXCHANGER IS COOL AND THERE IS A DEMAND FOR PREHEAT

Next: !p1241, f2440

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1285, !f1286

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p1288, !f1295

MAINS VOLTAGE TO PCB

Next: p1353, f1354

FUSE RESISTANCE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: p1371, f3107

RESISTANCE ON OFF SWITCH

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

Next: !p2571, !f2572

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2203, ?1755, ?1757, ?1759, ?2789

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2204, ?1834, ?1836, ?1838, ?2797

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

REMOVE WATER FROM IMPULSE TUBE DOES BOILER NOW LIGHT

REMOVE WATER INGRES 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, ?2801

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: p2566, f231

EXTERNAL CONTROLS CALLING

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1274, f1273

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: p2563, f2442

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2443, !f2444

EXTERNAL CONTROLS CALLING

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2537, f2538

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p2539, !f2540

EXTERNAL CONTROLS CALLING

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2555, f2556

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p2557, !f2558

RESISTANCE OVERHEAT AT PCB

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

Next: p2593, f2594

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2595, !f2596

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2615, ?2616, ?2618, ?2620, ?2787

RESISTANCE OVERHEAT AT PCB

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

Next: p2635, f2636

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2637, !f2638

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2657, ?2658, ?2660, ?2662, ?2795

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2674, ?2675, ?2677, ?2679, ?2799

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: p3160, f2692

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2695, !f2696

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2779, !f2780

VOLTAGE AT MAIN PCB

LOWER MAIN PCB
DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p3022, f3023

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p3024, f3025

FAN RESISTANCE

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3558, !f3027

FURTHER INVESTIGATION FUSE (MAINS)

Next: !p3108, !f3109

FURTHER INVESTIGATION FUSE (PCB)

Next: !p3111, !f3112

SPARKING (PRE HEAT)

Next: p3114, f3115

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: p3116, f3117

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3118, !f3119

OVER HEAT OPTION

Next: !p3148, !f3149

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3152, !f3153

RESISTANCE FAN HARNESS

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

Next: p3168, !f3169

RESISTANCE FAN HARNESS

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

Next: p3181, !f3182

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3187, !f3188

OVER HEAT OPTION

Next: !p3226, !f3227

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3230, !f3231

EXTERNAL CONTROLS CALLING

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p3271, f3272

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p3273, !f3274

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p3336, f3337

SYSTEM BYPASS

Next: !p3338, !f3339

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p3355, f3356

SYSTEM BYPASS

Next: !p3357, !f3358

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: p3428, f3429

RESISTANCE HARNESS PUMP

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

Next: !p3430, !f3431

FAN RESISTANCE

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3434, !f3435

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p3438, !f3439

DIVERTER VALVE RESISTANCE

REMOVE DIVERTER VALV

Next: !p3442, !f3443

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3446, !f3447

DIVERTER VALVE VOLTAGE PCB

Next: !p3461, !f3462

DIVERTER VALVE VOLTAGE PCB

Next: !p3475, !f3476

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3486, !f3487

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON
CH DEMAND

Next: p3490, !f3491

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3509, !f3510

DIVERTER VALVE VOLTAGE DHW

BOILER MAINS SWITCH ON
CH DEMAND

Next: p3513, !f3514

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p3541, !f3542

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p3548, f3549

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3550, !f3551

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p3554, !f3555

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: p3562, !f3563

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, ?2769

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

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p1289, !f1290

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2562, !f1292

HARNESS CHECK - THERMISTORS

Next: !p1320, !f1321

FUSE F1 PCB

REMOVE FUSE F1 FROM THE CONTROL BOX

Next: p1361, f3110

RESISTANCE ON OFF SWITCH AND HARNESS

LOWER THE PCB
REM

Next: p1363, f1364

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

DISCONNECT THE HARNE

Next: p2575, f3021

MAINS CONNECTOR INPUT

Next: p1372, !f1373

MAINS CONNECTOR OUTPUT

Next: !p1374, !f1375

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: p2765, !f2766

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: p2879, !f2882

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 AND HOLD THE SELECT BUTTON FOR 3 SECONDS OR GREATER THEN RELEASE TO RESET THE APPLIANCE

Next: p2267, ?1708, ?1710

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2589, f2592

HEAT EXCHANGER TEMP

Next: p1752, f1753

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2611, f2614

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

ENSURE SECONDARY HEA

Next: p2021, f2058

CAN BOILER BE RESET

PRESS AND HOLD THE SELECT BUTTON FOR 3 SECONDS OR GREATER THEN RELEASE TO RESET THE APPLIANCE

Next: p2398, ?1827, ?1829

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2631, f2634

HEAT EXCHANGER TEMP

Next: p1831, f1832

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2653, f2656

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

ENSURE SECONDARY HEA

Next: p2062, f2063

PUMP LIMPET

Next: p2164, !f2067

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p2524, ?2134, ?2136, ?2138, ?2783

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

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p2542, ?2166, ?2168, ?2170, ?2791

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

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: p2670, f2673

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

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 FAN 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, !f245

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p246, !f247

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

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
SET DHW TEMPERATURE TO MAX

Next: p2525, !f2526

SYSTEM BYPASS

Next: p2527, !f2528

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
CH TEMPERATURE SET TO MAX
CH DEMAND

Next: !p2529, ?2531, ?2533

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2535, f2536

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
SET DHW TEMPERATURE TO MAX

Next: p2543, !f2544

SYSTEM BYPASS

Next: p2545, !f2546

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
CH TEMPERATURE SET TO MAX
CH DEMAND

Next: !p2547, ?2549, ?2551

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p2553, f2554

OBSERVATION INTEGRAL TIMER DISCONNECTION (DHW)

DISCONNECT THE 4 WIRE CONNECTOR FROM THE INTEGRAL TIMER AND MAKE SAFE
BOILER MAINS SWITCH ON

Next: !p2564, !f2565

OBSERVATION INTEGRAL TIMER DISCONNECTION (CH)

DISCONNECT THE 4 WIRE CONNECTOR FROM THE INTEGRAL TIMER AND MAKE SAFE
CH DEMAND

Next: !p2567, !f2568

RESISTANCE HARNESS USER CONTROL

REMOVE HARNESS FROM PCB AND USER CONTROL

Next: !p3061, !f3062

FURTHER INVESTIGATION OVERHEAT

Next: !p2590, !f2591

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2597, ?2599, ?2601, ?2603, ?2785

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2609, !f2610

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2607, !f2608

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2605, !f2606

FURTHER INVESTIGATION OVERHEAT

Next: !p2612, !f2613

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2626, !f2627

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2624, !f2625

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2622, !f2623

POLARITY

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

Next: !p2629, !f2630

FURTHER INVESTIGATION OVERHEAT

Next: !p2632, !f2633

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2639, ?2641, ?2643, ?2645, ?2793

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2651, !f2652

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2649, !f2650

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2647, !f2648

FURTHER INVESTIGATION OVERHEAT

Next: !p2654, !f2655

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2668, !f2669

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2666, !f2667

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2664, !f2665

FURTHER INVESTIGATION OVERHEAT

Next: !p2671, !f2672

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2685, !f2686

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2683, !f2684

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2681, !f2682

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2767, !f2768

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2771, !f2772

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2773, !f2774

DISCONNECT EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROLS AND MAKE SAFE

Next: !p2777, f2778

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2781, !f2782

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2804, !f2805

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2807, !f2808

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2810, !f2811

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2813, !f2814

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2816, !f2817

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2819, !f2820

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2822, !f2823

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2825, !f2826

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2828, !f2829

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2831, !f2832

RESISTANCE USER CONTROL INTERFACE

Next: p2880, !f2881

INSPECTION DISPLAY PCB CONNECTIONS

REMOVE THE DISPLAY PCB

Next: !p2883, !f2884

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p2939, !f2940

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2965, !f2966

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2967, !f2968

FLAME DETECTION ELECTRODE GAP

REMOVE FAN AND BURNER FROM TOP OF HEAT EXCHANGER

Next: p2969, !f2970

CONDENSATE TRAP AND DRAIN

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

Next: p2971, !f2972

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2973, !f2974

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2975, !f2976

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p2977, !f2978

FLUE

Next: p2979, !f2980

PRIMARY FLUE SEAL

Next: !p2981, !f2982

IGNITION ELECTRODE GAP

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p3124, !f3125

VOLTAGE SPARK GENERATOR AT PCB

DISCONNECT THE 2 WIR

Next: p3120, !f3121

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p3122, !f3123

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT.

Next: p3126, ?3128, ?3130

CHECK IMPULSE TUBE

Next: p3144, !f3145

CHECK IMPULSE TUBE

Next: p3132, !f3133

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p3134, !f3135

CONDENSATE TRAP AND DRAIN

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

Next: p3136, !f3137

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3138, !f3139

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3140, !f3141

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3142, !f3143

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3146, f3147

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3150, f3151

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p3154, !f3155

CONDENSATE TRAP AND DRAIN

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

Next: p3156, !f3157

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3158, !f3159

OBSERVATION DISCONNECT FAN - DEMAND RECOGNISED?

REMOVE CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p3161, !f3162

OBSERVATION DISCONNECT FAN HARNESS - DEMAND RECOGNISED?

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p3557, !f3164

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3559, f3167

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3170, !f3171

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p3179, f3180

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p3185, f3186

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p3183, !f3184

RESISTANCE FAN HARNESS

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

Next: !p3189, !f3190

SPARKING (PRE HEAT)

Next: p3192, f3547

IGNITION ELECTRODE GAP

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p3202, !f3203

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT.

Next: p3204, ?3206, ?3208

CHECK IMPULSE TUBE

Next: p3222, !f3223

CHECK IMPULSE TUBE

Next: p3210, !f3211

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p3212, !f3213

CONDENSATE TRAP AND DRAIN

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

Next: p3214, !f3215

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3216, !f3217

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3218, !f3219

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3220, !f3221

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3224, f3225

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3228, f3229

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p3232, !f3233

CONDENSATE TRAP AND DRAIN

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

Next: p3234, !f3235

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3236, !f3237

IS SYSTEM FILLED AND VENTED

Next: p3257, !f3258

CONDENSATE TRAP AND DRAIN

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

Next: p3259, !f3260

CH OPERATION

BOILER MAINS SWITCH ON
CH TEMPERATURE TO MAX
CH DEMAND

Next: !p3261, ?3263, ?3265

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER ON/OFF SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p3269, f3270

SYSTEM BYPASS

Next: !p3267, !f3268

CONDENSATE TRAP AND DRAIN

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

Next: p3276, !f3277

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p3278, !f3279

CHECK IMPULSE TUBE

Next: p3280, !f3281

FLUE

Next: p3282, !f3283

PRIMARY FLUE SEAL

Next: p3284, !f3285

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3286, !f3287

INSULATION PADS

REMOVE FAN AND BURNER

Next: p3288, !f3289

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p3290, !f3291

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p3292, !f3293

IS SYSTEM FILLED AND VENTED

Next: p3295, !f3296

PUMP LIMPET

Next: p3297, !f3298

CH OPERATION

BOILER MAINS SWITCH ON
CH TEMPERATURE TO MAX
CH DEMAND

Next: !p3299, !f3300

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: p3320, !f3321

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p3322, !f3323

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p3324, !f3325

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p3326, !f3327

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3328, !f3329

CONDENSATE TRAP AND DRAIN

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

Next: p3330, !f3331

PUMP LIMPET

Next: p3332, !f3333

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP O

Next: !p3334, f3335

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p3341, !f3342

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p3343, !f3344

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p3345, !f3346

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3347, !f3348

PUMP LIMPET

Next: p3349, !f3350

PRESSURE GAS INLET (DHW)

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

Next: p3351, !f3352

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP O

Next: p3353, f3354

TEMPERATURE DHW AT APPLIANCE AND OUTLET (MIXER TAP PASSING)

Next: p3359, !f3360

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p3361, !f3362

CONDENSATE TRAP AND DRAIN

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

Next: p3363, !f3364

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p3365, !f3366

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3367, !f3368

IS SYSTEM FILLED AND VENTED

Next: p3370, !f3371

SYSTEM BYPASS

Next: !p3372, !f3373

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: p3432, f3433

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p3436, f3437

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE THE DIVERTER VALVE CONNECTOR FROM THE PCB

Next: p3440, f3441

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE SPARK GENERATOR CONNECTOR FROM THE PCB

Next: !p3444, f3445

DIVERTER VALVE POSITION (DHW)

REMOVE THE DIVERTER

Next: p3454, ?3455, ?3457

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3463, !f3464

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON

Next: !p3459, f3460

OBSERVATION DOES PREHEAT COMPLETE

ENSURE SECONDARY HEA

Next: !p3465, !f3466

DIVERTER VALVE POSITION (DHW)

REMOVE THE DIVERTER

Next: p3468, ?3469, ?3471

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3477, !f3478

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON

Next: !p3473, f3474

SECONDARY HEAT EXCHANGER

ENSURE SECONDARY HEA

Next: !p3479, !f3480

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p3482, !f3483

DIVERTER VALVE POSITION (CH)

REMOVE THE DIVERTER

Next: p3484, f3485

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3498, !f3499

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p3488, f3489

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p3492, !f3493

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3494, !f3495

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p3496, !f3497

PUMP LIMPET

Next: p3500, !f3501

SYSTEM BYPASS

Next: !p3502, !f3503

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p3505, !f3506

DIVERTER VALVE POSITION (CH)

REMOVE THE DIVERTER

Next: p3507, f3508

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR
(TO REMOVE THE ACTUATOR REMOVE THE CLIP AND PULL UPWARDS)

Next: p3521, !f3522

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p3511, f3512

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p3515, !f3516

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p3517, !f3518

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p3519, !f3520

PUMP LIMPET

Next: p3523, !f3524

SYSTEM BYPASS

Next: p3533, !f3526

PRIMARY FLUE SEAL

Next: p3534, !f3535

CONDENSATE TRAP AND DRAIN

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

Next: !p3536, !f3537

RESISTANCE DRY FIRE THERMISTOR AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB
ENSURE APPLIANCE IS COOL

Next: p3539, f3540

CAN SYSTEM BE RESET BY POWER OFF/ON

Next: p3543, !f3544

IS SYSTEM FILLED AND VENTED

Next: !p3545, !f3546

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p3552, f3553

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p3560, f3561

RESISTANCE FAN HARNESS

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

Next: !p3568, !f3569

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p3564, !f3565

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p3566, !f3567

BURNER IGNITES LF

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

Next: p678, f3113

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: !p3556, f663

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p1409, !f703

System Information

  • Total Tests: 841
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control