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 / EVO HE - RED TOP DIVERTER HEAD

GLOBALLY REPLACED

Next: &110, *

NO FAULT FOUND

Next: nff

IDEAL ISAR / EVO HE - RED TOP DIVERTER HEAD


BOILER FRONT

Next: &114, !f111

DHW FLOW RATE

Next: &2002, f544

PREHEAT SATISFACTORY

ENSURE SECONDARY HEA

Next: &179, ?309, ?311, ?797, ?1515, ?2369

CH DEMAND

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX

Next: &181, f229

DHW OPERATION

BOILER ON OFF SWITCH ON
BOILER DHW THERMOSTAT SET TO MAX

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

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
CH DEMAND

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

CH BURNER MODULATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX

Next: &nff, f222

PUMP RUNS (PREHEAT)

Next: &2250, ?237, ?239

CHOICE FULL DIAG OR FAULT CODE

THIS MODEL CONTAI

Next: &2384, f624

WATER IN IMPULSE TUBE

HEADER FOR IMPULSE TUBE INVESTIGATION

Next: &nff, f1910

POWER UP

Next: &623, f2003

FAN RUNS (PREHEAT)

Next: &2277, ?2251, ?2253

BURNER IGNITES (PREHEAT)

Next: &168, ?2278, ?2280

OBSERVATION DOES BOILER RECOGNISE A DEMAND

Next: &236, f2385

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER FOR FUSE INVESTIGATION

Next: &nff, f2601

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

CLOSED TOO MUCH 5

Next: End

PREHEAT INPUT CHECK

INPUT LINK

Next: End

LINK FAULT

INPUT LINK

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW BURNER MODULATION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

DHW BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

OUT OF CALIBRATION

DHW THERMISTOR

Next: End

PUMP RUNS PREHEAT

HARNESS - BOILER WIRING

Next: End

LF FAULT99PRE HEATFCDIAG

LEAD - DETECTION

Next: End

FAULT L E FAULT CODE DIAGNOSIS 3

ELECTRODE - FLAME DETECTION

Next: End

LF FAULT CODE

ELECTRODE - FLAME DETECTION

Next: End

PREHEAT FLAME SENSEFCDIAG

BURNER

Next: End

PREHEAT IGNITES BUT DOES NOT ESTABLISH 2

FLUE

Next: End

RESTRICTED OR BLOCKED 5

TRAP AND SEAL

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

PREHEAT SATISFACTORY

CARTRIDGE - DIVERTER VALVE

Next: End

BLOCKED PREHEAT SAT

PLATE - HEAT EXCHANGER

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

REACHES TEMP RADS COOL

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION

PUMP

Next: End

OPEN TOO MUCH

Next: End

PASSING CH OPPREHEAT

TAPS

Next: End

OUT OF CALIBRATION 7

DHW THERMISTOR

Next: End

OVERHEAT SECTION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 1

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

OVERHEAT

SYSTEM FILL AND VENT

Next: End

PUMP VOLTAGE

PCB - PRIMARY CONTROLS

Next: End

FAULTYLARESET

PUMP

Next: End

OVERHEAT OPERATION OH LA RESET

DHW THERMISTOR

Next: End

OVERHEAT SECTIONH_2 FC DIAGOHLARESET

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT SECTIONOHLARESET

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 DEMANDOHLARESETH9OH

INPUT LINK

Next: End

CLOSED TOO MUCH 3

Next: End

FAULT CODE DIAG

FAN

Next: End

FAULT HE

HARNESS FAN

Next: End

OVERHEAT OPERATION LA H9

DHW THERMISTOR

Next: End

OVERHEAT SECTION 2

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

PUMP VOLTAGE 2

PCB - PRIMARY CONTROLS

Next: End

FAULTYLARESETHA

PUMP

Next: End

OVERHEAT OPERATION OH LA RESET 2

DHW THERMISTOR

Next: End

OVERHEAT SECTIONH_2 FC DIAGOHLARESETHA

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT SECTIONOHLARESETHA

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

POTSOHLARESETHA

USER CONTROL (DISPLAY UNIT)

Next: End

OVERHEAT PROBLEMOHLARESETH9OHHA

PLATE - HEAT EXCHANGER

Next: End

CLOSED TOO MUCH 4

Next: End

O/H SECTION LINK IN SUPPLY CH DEMANDOHLARESETH9OHHA

INPUT LINK

Next: End

OVERHEAT OPERATION

DHW THERMISTOR

Next: End

OVERHEAT SECTION 3

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 3

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

WATER

GAS VALVE

Next: End

DRIED ALL WORKING

IMPULSE TUBE WATER INGRES

Next: End

L9

SYSTEM FILL AND VENT

Next: End

NO POWER POWER UP

Next: End

CONNECTOR FAULT POWER UP

MAINS CONNECTOR

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 CONTROL HARNESS

Next: End

LF FAULT CODE

HEAT ENGINE

Next: End

FALT CODE LF2

INSULATION - COMBUSTION CHAMBER

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

RESTRICTED OR BLOCKED 7

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

FLASHES LA OR HA

THERMISTOR - DRY FIRE

Next: End

NO INVESTIGATIONLA

BOILER OVERHEAT

Next: End

NOT RESETLA

THERMOSTAT - OVERHEAT

Next: End

OVERHEAT OPERATION 2

DHW THERMISTOR

Next: End

OVERHEAT SECTION 4

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 4

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FLASHES LA OR HA WILL NOT RESET

THERMISTOR - DRY FIRE

Next: End

OVERHEATLA

REDIRECTS

Next: End

OVERHEAT OPERATION 3

DHW THERMISTOR

Next: End

OVERHEAT SECTION 5

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 5

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

RESETS SHOWS 3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

FC DIAG H_N

POLARITY REVERSAL

Next: End

FLASHES H9 OR L9

THERMISTOR - DRY FIRE

Next: End

NO INVESTIGATIONLAH9

BOILER OVERHEAT

Next: End

NOT RESETLAH9

THERMOSTAT - OVERHEAT

Next: End

OVERHEAT OPERATION 4

DHW THERMISTOR

Next: End

OVERHEAT SECTION 6

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 6

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FLASHES H9 OR L9 WILL NOT RESET

THERMISTOR - DRY FIRE

Next: End

OVERHEATLAH9

REDIRECTS

Next: End

OVERHEAT OPERATION 5

DHW THERMISTOR

Next: End

OVERHEAT SECTION 7

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H_1 FC DIAGOVERHEAT 7

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

H9 OR L9 RESETS SHOWS 3 DASHES

THERMISTOR - DRY FIRE

Next: End

H9 OR L9 RESETS SHOWS 3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

RED DASH FC DIAG

PCB/ USER CONTROL HARNESS

Next: End

DASH DOT FAULT CODE

USER CONTROL INTERFACE

Next: End

DOT DASH FAULT CODE

USER CONTROL (DISPLAY UNIT)

Next: End

OVERHEATLAH93 DASHES

REDIRECTS

Next: End

OVERHEAT OPERATION 6

DHW THERMISTOR

Next: End

OVERHEAT SECTION 8

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

CH BURNER MODULATION

USER CONTROL (DISPLAY UNIT)

Next: End

H_1 FC DIAGOVERHEAT 8

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

3 DASHES

THERMISTOR - DRY FIRE

Next: End

3 DASHES 1

THERMISTOR - DRY FIRE

Next: End

99PRE HEATFCDIAG

LEAD - DETECTION

Next: End

FAULT L E FAULT CODE DIAGNOSIS 2

ELECTRODE - FLAME DETECTION

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

RESTRICTED OR BLOCKED 10

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

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

RESTRICTED OR BLOCKED 9

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

RADS TOO COOL BOILER TO TEMP

CARTRIDGE - DIVERTER VALVE

Next: End

BOILER FIRING AFTER PREHEAT WITH NO DEMAND

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

ON WITH NO DEMAND

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

H THEN F OR L THEN F DOT

LEAD - DETECTION

Next: End

L THEN F OR H THEN F DOT

ELECTRODE - FLAME DETECTION

Next: End

OUT OF CALIBRATION 4

DHW THERMISTOR

Next: End

OUT OF CALIBRATION 5

DHW THERMISTOR

Next: End

PUMP DOES NOT RUN

DHW THERMISTOR

Next: End

PREHEAT SATISFACTORY

PCB - PRIMARY CONTROLS

Next: End

PREHEAT SATISFACTORY

HARNESS - BOILER WIRING

Next: End

DHW QUIET OPERATION RADIATORS WARM

PCB - PRIMARY CONTROLS

Next: End

DHW RADS WARM

HARNESS - BOILER WIRING

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

PUMP RUNS (PREHEAT)

THERMISTOR - BOILER CONTROL (FLOW)

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

CH BOILER TO TEMP

HARNESS - BOILER WIRING

Next: End

DIVERTER VOLTAGE CH OP

PCB - PRIMARY CONTROLS

Next: End

RADS COOL CH OP

DHW THERMISTOR

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

PASSING CH OP

TAPS

Next: End

CLOSED TOO MUCH

Next: End

PUMP RUNS (PREHEAT)

THERMISTOR - DRY FIRE

Next: End

PUMP RUNS (PREHEAT)

DHW THERMISTOR

Next: End

RESTRICTED OR BLOCKED

TRAP AND SEAL

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

RUNNING SLOW / WEAK

PUMP

Next: End

RADS COOL CH OP 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

SHUTS DOWN PREMATURELY

CARTRIDGE - DIVERTER VALVE

Next: End

CH BOILER TO TEMP 2

HARNESS - BOILER WIRING

Next: End

DIVERTER VOLTAGE CH OP 2

PCB - PRIMARY CONTROLS

Next: End

OUT OF CALIBRATION 6

DHW THERMISTOR

Next: End

PASSING CH OP 2

TAPS

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

MAINS FUSE INVESTIGATION

REDIRECTS

Next: End

POWER UP

FUSE MAIN PCB F1

Next: End

FUSE F1 BLOWS PREHEAT9999

FAN

Next: End

FUSE BLOW

GAS VALVE

Next: End

ELECTRICAL SHORT

DIVERTER VALVE HEAD

Next: End

FUSE BLOWN 4

HARNESS - BOILER WIRING

Next: End

FUSE BLOWN 3

HARNESS - BOILER WIRING

Next: End

KETTLING

SYSTEM FILL AND VENT

Next: End

AIR IN CH CIRCUIT

SYSTEM FILL AND VENT

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

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 3 BURNER DOES NOT IGNITE

TRAP AND SEAL

Next: End

NO GAS DROP

INJECTOR & HOUSING

Next: End

BURNER DOES NOT IGNITE 2

INJECTOR & HOUSING

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 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

SPARK GEN BURNER IGNITES PREHEAT 2

PCB - PRIMARY CONTROLS & HARNESS BOILER

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARKING 2

ELECTRODE - IGNITION

Next: End

IGNITION BURNER IGNITES PREHEAT NO SPARK

ELECTRODE - IGNITION

Next: End

BURNER IGNITES PREHEAT NO SPARK2

GAS VALVE

Next: End

BURNER IGNITES PREHEAT NO SPARK2

HARNESS - BOILER WIRING

Next: End

BURNER IGNITES PREHEAT NO SPARK

HARNESS - BOILER WIRING

Next: End

BURNER IGNITES PREHEAT NO SPARK

GAS VALVE

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

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

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

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 2

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

FAN DOES NOT RUN 2

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

FAN DOES NOT RUN

HARNESS FAN

Next: End

DHW NOISY

HEAT ENGINE

Next: End

DHW OPERATION

PUMP

Next: End

DHW OPERATION

THERMISTOR - BOILER CONTROL (FLOW)

Next: End

DHW OPERATION

THERMISTOR - DRY FIRE

Next: End

OUT OF CALIBRATION 2

DHW THERMISTOR

Next: End

DHW OPERATION

THERMOSTAT - OVERHEAT

Next: End

DHW OPERATION

THERMISTOR - BOILER CONTROL (RETURN)

Next: End

CLOSED TOO MUCH 6

Next: End

RESTRICTED OR BLOCKED 6

TRAP AND SEAL

Next: End

DHW FLOW RATE

FLOW RESTRICTOR

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

PREHEAT SATISFACTORY

HEAT ENGINE

Next: End

CH INPUT

MULTI FAULT PCB

Next: End

EXTERNAL CONTROL

HARNESS INPUT

Next: End

PREHEAT DEMAND

Next: End

EXTERNAL CONTROL

HARNESS EXTERNAL CONTROL

Next: End

CH DEMAND

Next: End

DHW BURNER MODULATION

PCB - PRIMARY CONTROLS

Next: End

PUMP RUNS THEN STOPS

PCB - PRIMARY CONTROLS

Next: End

HF FAULTL_E FC DIAG

PCB - PRIMARY CONTROLS

Next: End

L_E FC DIAG

PCB - PRIMARY CONTROLS

Next: End

LETBY PREHEAT

CARTRIDGE - DIVERTER VALVE

Next: End

LETBY DHW OPERATION

CARTRIDGE - DIVERTER VALVE

Next: End

RADIATORS COOL, BOILER TO TEMPERATURE

Next: End

PRE HEAT STUCK CH OPPREHEAT

PCB - PRIMARY CONTROLS

Next: End

OVERHEAT TEMP

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 1

HARNESS - BOILER WIRING

Next: End

OVERHEATING 21

HARNESS - BOILER WIRING

Next: End

OVERHEATING 11

HARNESS - BOILER WIRING

Next: End

PREHAT COMPLET9999OHLARESET

PUMP

Next: End

OVERHEATING 9

HARNESS - BOILER WIRING

Next: End

OVERHEATING 29

HARNESS - BOILER WIRING

Next: End

OVERHEATING 19

HARNESS - BOILER WIRING

Next: End

RUN OKOH

BOILER OVERHEAT

Next: End

OH SECTIONOHLARESETH9OH

MULTI FAULT PCB

Next: End

FAULTYOHLARESETH9OH

HARNESS EXTERNAL CONTROL

Next: End

O/H SECTION NO REACT TO CH DEMANDOHLARESETH9OH

Next: End

NOISY

HEAT ENGINE

Next: End

FAULT HE

PCB - PRIMARY CONTROLS

Next: End

OVERHEAT TEMP 2

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 2

HARNESS - BOILER WIRING

Next: End

OVERHEATING 22

HARNESS - BOILER WIRING

Next: End

OVERHEATING 12

HARNESS - BOILER WIRING

Next: End

PREHAT COMPLET9999OHLARESETHA

PUMP

Next: End

OVERHEATING 10

HARNESS - BOILER WIRING

Next: End

OVERHEATING 30

HARNESS - BOILER WIRING

Next: End

OVERHEATING 20

HARNESS - BOILER WIRING

Next: End

RUN OKOHHA

BOILER OVERHEAT

Next: End

NOISY 2

HEAT ENGINE

Next: End

OH SECTIONOHLARESETH9OHHA

MULTI FAULT PCB

Next: End

FAULTYOHLARESETH9OHHA

HARNESS EXTERNAL CONTROL

Next: End

O/H SECTION NO REACT TO CH DEMANDOHLARESETH9OHHA

Next: End

OVERHEAT TEMP 23 DASHES

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 3

HARNESS - BOILER WIRING

Next: End

OVERHEATING 23

HARNESS - BOILER WIRING

Next: End

OVERHEATING 13

HARNESS - BOILER WIRING

Next: End

IMPULSE TUBE

WATER LEAK AND GAS VALVE

Next: End

IMPULSE TUBE

WATER LEAK

Next: End

PUMP RUNS (PREHEAT)

PUMP

Next: End

FROM PCB

HARNESS - BOILER WIRING

Next: End

PUMP NOT RUNNING ON PREHEAT

PCB - PRIMARY CONTROLS

Next: End

DHW FC DIAG PUMP NOT RUNNING STARTUP

HARNESS - BOILER WIRING

Next: End

MAINS CONNECTOR PCB POWER UP

HARNESS - BOILER WIRING

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

BLANK DISPLAY

USER CONTROL INTERFACE

Next: End

LF FAULT99L_E FC DIAG

PCB - PRIMARY CONTROLS

Next: End

PREHEATFCDIAG

GAS INLET PRESSURE

Next: End

INCORRECT MIX 1

GAS VALVE

Next: End

FLASHES LA OR HA

HARNESS - BOILER WIRING

Next: End

INVESTIGATIONLA

REDIRECTS

Next: End

OVERHEATLA

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMP 3

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 4

HARNESS - BOILER WIRING

Next: End

OVERHEATING 24

HARNESS - BOILER WIRING

Next: End

OVERHEATING 14

HARNESS - BOILER WIRING

Next: End

FLASHES LA OR HA WILL NOT RESET

HARNESS - BOILER WIRING

Next: End

OVERHEATLA

BOILER OVERHEAT

Next: End

OVERHEAT TEMP 4

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 5

HARNESS - BOILER WIRING

Next: End

OVERHEATING 25

HARNESS - BOILER WIRING

Next: End

OVERHEATING 15

HARNESS - BOILER WIRING

Next: End

RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

FLASHES H THEN N

PCB - PRIMARY CONTROLS

Next: End

FLASHES H9 OR L9

HARNESS - BOILER WIRING

Next: End

INVESTIGATIONLAH9

REDIRECTS

Next: End

OVERHEATLAH9

HARNESS - BOILER WIRING

Next: End

OVERHEAT TEMP 5

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 6

HARNESS - BOILER WIRING

Next: End

OVERHEATING 26

HARNESS - BOILER WIRING

Next: End

OVERHEATING 16

HARNESS - BOILER WIRING

Next: End

FLASHES H9 OR L9 WILL NOT RESET

HARNESS - BOILER WIRING

Next: End

OVERHEATLAH9

BOILER OVERHEAT

Next: End

OVERHEAT TEMP 6

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 7

HARNESS - BOILER WIRING

Next: End

OVERHEATING 27

HARNESS - BOILER WIRING

Next: End

OVERHEATING 17

HARNESS - BOILER WIRING

Next: End

H9 OR L9 RESETS SHOWS 3 DASHES

HARNESS - BOILER WIRING

Next: End

H9 OR L9 RESETS SHOWS 3 DASHES 1

HARNESS - BOILER WIRING

Next: End

RED DASH

PCB - PRIMARY CONTROLS

Next: End

OVERHEATLAH93 DASHES

BOILER OVERHEAT

Next: End

OVERHEAT TEMP 7

PCB - PRIMARY CONTROLS

Next: End

CH BURNER MODULATION

PCB - PRIMARY CONTROLS

Next: End

OVERHEATING 8

HARNESS - BOILER WIRING

Next: End

OVERHEATING 28

HARNESS - BOILER WIRING

Next: End

OVERHEATING 18

HARNESS - BOILER WIRING

Next: End

3 DASHES

HARNESS - BOILER WIRING

Next: End

3 DASHES 1

HARNESS - BOILER WIRING

Next: End

FAN HUNTS

PCB - PRIMARY CONTROLS

Next: End

PRESSURE DROPS AWAY

GAS INLET PRESSURE

Next: End

CH DEMAND

PCB - PRIMARY CONTROLS

Next: End

WRONG MIX 1

GAS VALVE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

PCB - PRIMARY CONTROLS

Next: End

ON WITH NO DEMAND

Next: End

ON WITH NO DEMAND

PCB - PRIMARY CONTROLS

Next: End

FAULT HF

PCB - PRIMARY CONTROLS

Next: End

DOES NOT RECOGNISE DEMAND

HARNESS - BOILER WIRING

Next: End

HB OR LB FAULT CODE

USER CONTROLS

Next: End

STICKING

DIVERTER VALVE HEAD

Next: End

PREHEAT SATISFACTORY

DIVERTER VALVE HEAD

Next: End

TEMP RISE POOR RADS WARM

DIVERTER VALVE HEAD

Next: End

DHW OPERATION

DIVERTER VALVE HEAD

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

CH OPERATION

DIVERTER VALVE HEAD

Next: End

PRE HEAT STUCK CH OP

PCB - PRIMARY CONTROLS

Next: End

BOILER CYCLING

PCB - PRIMARY CONTROLS

Next: End

RESTRICTED OR BLOCKED

PLATE - HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED

HEAT ENGINE

Next: End

WRONG MIX 2

GAS VALVE

Next: End

CH OPERATION 2

DIVERTER VALVE HEAD

Next: End

PRE HEAT STUCK CH OP 2

PCB - PRIMARY CONTROLS

Next: End

PREMATURE SHUTDOWN OR BOILER DOESNT FIRE

PCB - PRIMARY CONTROLS

Next: End

POWER UP

FUSE MAINS

Next: End

PCB FUSE INVESTIGATION

REDIRECTS

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

BLOWING FUSES

PUMP

Next: End

FAULT CODE L-F

THERMOSTAT - OVERHEAT

Next: End

FAULT CODE LF

HARNESS - BOILER WIRING

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

GAS VALVE

Next: End

MECHANICAL BURNER DOES NOT IGNITE

GAS VALVE

Next: End

FLUE FC DIAG 2

HARNESS - BOILER WIRING

Next: End

FAULT CODE H4

FAULT CODE RESET - RETEST APPLIANCE

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 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

BLANK DISPLAY 2

PCB AND FAN HARNESS

Next: End

BLANK DISPLAY

PCB AND FAN HARNESS

Next: End

FAN RUNS NO SPARK

HARNESS - BOILER WIRING

Next: End

NO SPARKING 4

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

FAN RUNS NO SPARK 2

HARNESS - BOILER WIRING

Next: End

NO SPARKING

PCB - PRIMARY CONTROLS & SPARK GENERATOR

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 DOESNT RUN

PCB - PRIMARY CONTROLS

Next: End

FAN NOT 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

PCB - PRIMARY CONTROLS

Next: End

FAN DOES NOT RUN BLUE PCB FITTED

FAN

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

H_2 FC DIAG

PCB - PRIMARY CONTROLS

Next: End

RETURN FC DIAG

HARNESS - BOILER WIRING

Next: End

H_1 FC DIAG

PCB - PRIMARY CONTROLS

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

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1254

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1255

FLASHES H9 OR L9

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

Next: p1785

1 DASH AND/OR DOT

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

Next: p2218

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

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p1662

3 DASHES

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

Next: p1862

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1676

RESETS _SHOWS THREE DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1678

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1683

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1685

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1687

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1723

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1725

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1727

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p1770

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p1743

WILL NOT RESET

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1788

RESETS _SHOWS THREE DASHES

CHARACTERISTIC TEST FROM CAN BOILER BE RESET

Next: p1790

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1795

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1797

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1799

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1833

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1835

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1837

SYSTEM KETTLES (O/H)

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: !p1853

SYSTEM DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (HEX PROVING)

Next: p1855

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1867

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1869

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p1871

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p2057

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p2059

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2085

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2099

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2101

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2103

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2111

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2120

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2122

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2124

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2132

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2136

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2162

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2176

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2178

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2180

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2188

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2199

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2201

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2203

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2211

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2213

FLOW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2231

RETURN THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2233

DHW THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2235

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2243

DRY FIRE THERMISTOR RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE CONTROL THERMISTORS AND HARNESS

Next: p2245

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p2826

FAN HUNTS RUNS SLOWS RUNS SLOWS

CHARACTERISTIC TEST FROM FAN RUNS (PREHEAT)

Next: p2254

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p2279

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES (PREHEAT)

Next: p2281

GAS FLOW PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM GAS FLOW

Next: !p2297

GAS FLOW DIPS BUT STILL NO IGNITION

CHARACTERISTIC TEST FROM GAS FLOW

Next: p2299

PREHEAT SATISFACTORY - BOILER FIRES WITH NO DEMAND DISPLAY SHOWS C

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2371

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM PUMP RUNS (PREHEAT)

Next: p1919

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: p2379

PUMP RUNS FOR APPROXIMATELY 5 SECONDS THEN STOPS

CHARACTERISTIC TEST FROM PUMP RUNS (PREHEAT)

Next: p243

HB OR LB (B WILL BE IN LOWER CASE)

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

Next: !p2395

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2399

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p2402

DIVERTER VALVE STICKING

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: !p2408

DIVERTER VALVE NOT IN CORRECT POSITION

CHARACTERISTIC TEST FROM DIVERTER VALVE DHW POSITION

Next: p2411

RADIATORS HEAT UP DURING PREHEAT FUNCTION WITH NO CH DEMAND

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p1617

BOILER KETTLING

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2631

DHW NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p392

DHW TEMPERATURE RISE INSUFFICIENT, RADS BEGIN TO HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1628

BOILER CYCLING

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p406

DHW TEMPERATURE RISE INSUFFICIENT , RADS REMAIN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2795

CH NOISY DURING OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p2650

BOILER FIRES FOR CH AND REACHES TEMPERATURE BUT RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1639

BOILER SHUTS DOWN PREMATURELY OR DOES NOT FIRE FOR CH

CHARACTERISTIC TEST FROM CH OPERATION

Next: p2562

EXCESSIVE SYSTEM PRESSURE RISE

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: p1673

FLASHES L THEN 8

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

Next: p2433

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: p2716

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: p2158

NOISE WHEN MODULATING DOWN OR COMBUSTION NOISE DURING OPERATION

CHARACTERISTIC TEST FROM PREHEAT SATISFACTORY

Next: p2532

FLASHES H THEN E

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

Next: p1780

30/07/2019 12:12:44 1907_0_50_1 08/08/2019 10:57:34

05/08/2019 15:13:48

Next: End

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: !p1681, ?1682, ?1684, ?1686, ?2135

PUMP VOLTAGE

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

Next: !p1716, !f1717

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1746, f1747

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1748, !f1749

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p1793, ?1794, ?1796, ?1798, ?2212

PUMP VOLTAGE

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

Next: !p1826, !f1827

EXTERNAL CONTROLS CALLING

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1858, f1859

EXTERNAL CONTROLS VOLTAGE (IN)

Next: !p1860, !f1861

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p1865, ?1866, ?1868, ?1870, ?2244

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: p1911, f1912

VISUALLY CHECK FOR WATER LEAKS

Next: !p1913, !f1914

PUMP VOLTAGE AT PCB

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

Next: !p1922, f1923

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p1924, f1925

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1926, !f2397

MAINS VOLTAGE TO PCB

Next: p2004, f2005

FUSE RESISTANCE FUSED SPUR

REMOVE FUSE FROM FUSED SPUR

Next: p2006, f2593

RESISTANCE ON OFF SWITCH

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

Next: !p2016, !f2017

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p2020, f2021

VOLTAGE AT MAIN PCB

LOWER MAIN PCB
DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p2022, f2023

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p2024, f2025

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2775, !f2027

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p2030, f2031

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2776, !f2033

SPARKING (PRE HEAT)

Next: p2042, f2725

RESISTANCE OVERHEAT AT PCB

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

Next: p2092, f2093

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2094, !f2095

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2118, ?2119, ?2121, ?2123, ?2131

RESISTANCE OVERHEAT AT PCB

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

Next: p2169, f2170

RESISTANCE OVERHEAT

REMOVE ONE OR BOTH

Next: !p2171, !f2172

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2197, ?2198, ?2200, ?2202, ?2210

POTENTIOMETER RESISTANCE (CH)

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

Next: !p223, !f224

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2229, ?2230, ?2232, ?2234, ?2242

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

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2460, !f2368

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2374, !f2375

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: p2416, f2387

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2388, !f2389

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p2436, f2437

RESISTANCE FAN HARNESS

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

Next: p2438, !f2439

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2444, !f2445

RESISTANCE FAN HARNESS

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

Next: p2450, !f2451

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2456, !f2457

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p2465, !f2466

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p2485, f2486

SYSTEM BYPASS

Next: !p2487, !f2488

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2567, !f2568

DISPLAY SHOWS CORRECT DEMAND

IF PREHEAT ACTIVATES THEN ALLOW TO SATISFY

Next: p2573, !f2574

FURTHER INVESTIGATION FUSE (MAINS)

Next: !p2596, !f2595

FURTHER INVESTIGATION FUSE (PCB)

Next: !p2598, !f2599

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: p2602, f2606

RESISTANCE HARNESS PUMP

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

Next: !p2629, !f2630

FAN RESISTANCE

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2612, !f2613

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p2614, !f2615

DIVERTER VALVE RESISTANCE

DISCONNECT THE DIVERTER VALVE HEAD

Next: !p2616, !f2617

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p2627, !f2628

OVER HEAT OPTION

Next: !p2660, !f2661

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p2665, !f2666

OVER HEAT OPTION

Next: !p2680, !f2681

GAS VALVE RESISTANCE

DISCONNECT LEADS FROM GAS VALVE

Next: !p2684, !f2685

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2719, !f2720

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p2726, f2727

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p2728, f2729

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p2730, !f2731

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p2734, !f2735

RESISTANCE GAS VALVE AND HARNESS - BLUE

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2738, f2739

GAS VALVE RESISTANCE - BLUE

DISCONNECT LEADS FROM GAS VALVE

Next: !p2778, !f2777

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p2748, !f2749

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p2751, f2752

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p2753, f2754

HARNESS CONTINUITY PCB TO SPARK GEN

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p2755, !f2756

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p2759, !f2760

RESISTANCE GAS VALVE AND HARNESS - BLUE

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2763, f2764

GAS VALVE RESISTANCE - BLUE

DISCONNECT LEADS FROM GAS VALVE

Next: !p2784, !f2791

ELECTRODE CONTINUITY AND CONDITION

UNPLUG ELECTRODE FROM HT LEAD

Next: !p2773, !f2774

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p2812, f2813

SYSTEM BYPASS

Next: !p2814, !f2815

FAN VOLTAGE PERMANENT HALL SENSOR

NO DEMANDS FOR CH OR

Next: p2829, f2830

RESISTANCE FAN HARNESS

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

Next: p2831, !f2832

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: p2837, !f2838

RESISTANCE FAN HARNESS

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

Next: p2847, !f2848

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: p2853, !f2854

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, ?1553, ?2378, ?2394

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p664, !f2396

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

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, !f1290

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p1291, !f1292

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: 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, !f1434

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2037, !f2040

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: !p1440, !f1441

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1669, !f1519

OVERHEAT THERMOSTAT RESISTANCE

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: !p1527, !f1528

DIVERTER VALVE POSITION (DHW)

REMOVE DIVERTER HEAD

Next: p1618, ?2398, ?2400

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p1624, !f1625

OBSERVATION DOES PREHEAT COMPLETE

ENSURE SECONDARY HEA

Next: !p1626, !f1627

DIVERTER VALVE POSITION (DHW)

REMOVE DIVERTER HEAD

Next: p1629, ?2407, ?2409

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p1635, !f1636

SECONDARY HEAT EXCHANGER

ENSURE SECONDARY HEA

Next: !p1637, !f1638

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p1640, !f1641

DIVERTER VALVE POSITION (CH)

DIVERTER VALVE LOCAT

Next: p1642, f2356

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p1654, !f1655

PUMP LIMPET

Next: p1656, !f1657

SYSTEM BYPASS

Next: !p1658, !f1659

DHW INLET VALVE

TURN OFF DHW INLET ISOLATION VALVE

Next: p1517, !f1668

CAN BOILER BE RESET

PRESS THE RESET BUTTON IN THE MIDDLE
OF THE USER DISPLAY

Next: p1674, ?1675, ?1677

IS SYSTEM FILLED AND VENTED

Next: p1712, !f1713

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2088, f2091

HEAT EXCHANGER TEMP

Next: p1679, f1680

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2114, f2117

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p1692, !f1693

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p1690, !f1691

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1688, !f1689

PUMP RUNS

BOILER MAINS SWITCH

Next: p1714, f1715

PUMP LIMPET

Next: p1718, !f1719

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p1720, ?1722, ?1724, ?1726, ?2084

POTENTIOMETER RESISTANCE (DHW)

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

Next: p1734, !f1735

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p1732, !f1733

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p1730, !f1731

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1728, !f1729

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
TURN HW STAT TO MAX

Next: p1752, !f1737

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: !p1738, ?1740, ?1742

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1744, f1745

SYSTEM BYPASS

Next: p1736, !f1767

FAN RESISTANCE

DISCONNECT THE FAN HARNESS FROM FAN

Next: p1781, !f1782

RESISTANCE FAN HARNESS

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

Next: !p1783, !f1784

CAN BOILER BE RESET

PRESS THE RESET BUTTON IN THE MIDDLE
OF THE USER DISPLAY

Next: p1917, ?1787, ?1789

PUMP RUNS

BOILER MAINS SWITCH

Next: p1824, f1825

COOL DOWN HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2165, f2168

HEAT EXCHANGER TEMP

Next: p1791, f1792

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2193, f2196

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p1804, !f1805

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p1802, !f1803

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1800, !f1801

PUMP LIMPET

Next: p1828, !f1829

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p1830, ?1832, ?1834, ?1836, ?2161

POTENTIOMETER RESISTANCE (DHW)

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

Next: p1844, !f1845

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p1842, !f1843

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p1840, !f1841

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1838, !f1839

DHW HEAT EXCHANGER TEMPERATURE

LOWER PCB
TURN HW STAT TO MAX

Next: p1846, !f1847

SYSTEM BYPASS

Next: p1848, !f1849

CH OPERATION (HEX PROVING)

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: !p1850, ?1852, ?1854

EXTERNAL CONTROLS VOLTAGE OUT PCB

BOILER SWITCH ON
EXTERNAL CONTROLS CALLING

Next: !p1856, f1857

HEAT EXCHANGER TEMP

Next: p1863, f1864

COOL HEAT EXCHANGER AND RESET APPLIANCE

ALLOW FAN OVERRUN TO COMMENCE

Next: p2225, f2228

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p1876, !f1877

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p1874, !f1875

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1872, !f1873

VISUALLY CHECK FOR WATER LEAKS

Next: !p1915, !f1916

IS SYSTEM FILLED AND VENTED

Next: p1786, !f1918

PUMP VOLTAGE

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

Next: !p1920, f1921

FUSE F1 PCB

REMOVE FUSE F1 FROM THE CONTROL BOX

Next: p2012, f2597

MAINS CONNECTOR INPUT

Next: p2008, !f2009

MAINS CONNECTOR OUTPUT

Next: !p2010, !f2011

RESISTANCE ON OFF SWITCH AND HARNESS

LOWER THE PCB
REM

Next: p2014, f2015

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

DISCONNECT THE HARNE

Next: p2018, f2019

RESISTANCE HARNESS USER CONTROL

REMOVE HARNESS FROM PCB AND USER CONTROL

Next: !p2034, !f2035

VOLTAGE MAIN PCB

DISCONNECT DISPLAY HARNESS FROM THE MAIN PCB

Next: !p2028, f2029

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2038, !f2039

IGNITION ELECTRODE GAP AND CONDITION

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p2052, !f2053

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2656, ?2056, ?2058

CHECK IMPULSE TUBE

Next: p2060, !f2061

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2062, !f2063

CONDENSATE TRAP AND DRAIN

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

Next: p2064, !f2065

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2066, !f2067

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2068, !f2069

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2070, !f2071

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2086, !f2087

FURTHER INVESTIGATION OVERHEAT

Next: !p2089, !f2090

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2096, ?2098, ?2100, ?2102, ?2110

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2108, !f2109

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2106, !f2107

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2104, !f2105

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2112, !f2113

FURTHER INVESTIGATION OVERHEAT

Next: !p2115, !f2116

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2129, !f2130

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2127, !f2128

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2125, !f2126

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2133, !f2134

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2137, !f2138

POLARITY

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

Next: !p2159, !f2160

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2163, !f2164

FURTHER INVESTIGATION OVERHEAT

Next: !p2166, !f2167

RESISTANCE CONTROL THERMISTORS AND HARNESS

REMOVE THERMISTOR CONNECTOR FROM PCB

Next: !p2173, ?2175, ?2177, ?2179, ?2187

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2185, !f2186

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2183, !f2184

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2181, !f2182

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2191, !f2192

FURTHER INVESTIGATION OVERHEAT

Next: !p2194, !f2195

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2208, !f2209

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2206, !f2207

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2204, !f2205

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2214, !f2215

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2216, !f2217

RESISTANCE HARNESS USER CONTROL

REMOVE HARNESS FROM PCB AND USER CONTROL

Next: p2219, !f2220

RESISTANCE USER CONTROL INTERFACE

Next: p2221, !f2222

INSPECTION DISPLAY PCB CONNECTIONS

REMOVE THE DISPLAY PCB

Next: !p2223, !f2224

FURTHER INVESTIGATION OVERHEAT

Next: !p2226, !f2227

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: !p2240, !f2241

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2238, !f2239

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: !p2236, !f2237

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2246, !f2247

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: !p2248, !f2249

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2255, !f2256

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2257, !f2258

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p2324, !f2325

SPARKING (PRE HEAT)

Next: p2282, f2750

IGNITION ELECTRODE GAP AND CONDITION

REMOVE IGNITION ELECTRODE FROM ITS HOUSING

Next: p2292, !f2293

GAS VALVE OPENS

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2675, ?2296, ?2298

CHECK IMPULSE TUBE

Next: p2300, !f2301

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2302, !f2303

CONDENSATE TRAP AND DRAIN

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

Next: p2304, !f2305

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2306, !f2307

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2308, !f2309

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2310, !f2311

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2326, !f2327

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2328, !f2329

FLAME DETECTION ELECTRODE GAP

REMOVE FAN AND BURNER FROM TOP OF HEAT EXCHANGER

Next: p2330, !f2331

CONDENSATE TRAP AND DRAIN

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

Next: p2332, !f2333

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2334, !f2335

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2336, !f2337

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p2338, !f2339

FLUE

Next: p2340, !f2341

PRIMARY FLUE SEAL

Next: !p2342, !f2343

DISCONNECT EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROLS AND MAKE SAFE

Next: !p2372, f2373

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2376, !f2377

FLAME SENSE LEAD CONTINUITY

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
UNPLUG CONNECTION FROM PCB

Next: p2380, !f2381

FLAME SENSE ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2382, !f2383

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON
REMOVE DIVERTER VALVE CONNECTOR FROM DIVERTER VALVE

Next: p2403, !f2404

DIVERTER VALVE VOLTAGE (PERMANENT)

BOILER MAINS SWITCH ON

Next: !p2405, !f2406

DIVERTER VALVE VOLTAGE (DHW)

BOILER MAINS SWITCH ON
REMOVE DIVERTER VALVE CONNECTOR FROM DIVERTER VALVE

Next: p2412, !f2413

DIVERTER VALVE VOLTAGE (PERMANENT)

BOILER MAINS SWITCH ON

Next: !p2414, !f2415

OBSERVATION DISCONNECT FAN - DEMAND RECOGNISED?

REMOVE CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p2417, !f2419

OBSERVATION DISCONNECT FAN HARNESS - DEMAND RECOGNISED?

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p2794, !f2420

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p244, !f245

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p2434, f2435

VOLTAGE PERMANENT FAN HALL SENSOR

NO DEMANDS FOR CH OR

Next: p2448, f2449

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p2442, f2443

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2440, !f2441

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p246, !f247

RESISTANCE FAN HARNESS

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

Next: !p2446, !f2447

VOLTAGE FAN AT PCB

DISCONNECT DHW THERM

Next: p2454, f2455

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2452, !f2453

RESISTANCE FAN HARNESS

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

Next: !p2458, !f2459

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p248, !f249

DIVERTER VALVE VOLTAGE (PERMANENT)

BOILER MAINS SWITCH ON

Next: p2462, !f2461

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p2463, f2464

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p2467, !f2468

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p2469, !f2470

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP ON

Next: !p2483, f2484

PUMP LIMPET

Next: p2471, !f2555

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p1319, !f251

CONDENSATE TRAP AND DRAIN

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

Next: p2472, !f2529

CONDENSATE TRAP AND DRAIN

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

Next: p2533, !f2546

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p2538, !f2547

FLUE

Next: p2535, !f2549

PRIMARY FLUE SEAL

Next: p2536, !f2550

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2537, !f2551

INSULATION PADS

REMOVE FAN AND BURNER

Next: p2543, !f2552

CHECK IMPULSE TUBE

Next: p2534, !f2548

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: p2544, !f2553

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2545, !f2554

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2563, !f2564

DIVERTER VALVE POSITION (CH)

DIVERTER VALVE LOCAT

Next: p2565, f2566

DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER

Next: p2579, !f2580

DIVERTER VALVE VOLTAGE (PERMANENT)

BOILER MAINS SWITCH ON

Next: p2569, !f2570

DIVERTER VALVE VOLTAGE (CH)

BOILER MAINS SWITCH ON
CH DEMAND

Next: !p2571, f2572

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p2575, !f2576

TAPS

ALLOW PRE HEAT TO SATISFY

Next: !p2577, !f2578

PUMP LIMPET

Next: p2581, !f2582

SYSTEM BYPASS

Next: p2585, !f2584

POTENTIOMETER RESISTANCE (CH)

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

Next: p2587, !f2586

PRIMARY FLUE SEAL

Next: p2590, !f2589

CONDENSATE TRAP AND DRAIN

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

Next: !p2591, !f2592

RESISTANCE FAN AND HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: p2603, f2607

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2604, f2608

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE DIVERTER VALV

Next: p2622, f2609

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE SPARK GENERATOR CONNECTOR FROM THE PCB

Next: !p2623, f2624

IS SYSTEM FILLED AND VENTED

Next: p525, !f2649

IS SYSTEM FILLED AND VENTED

Next: p438, !f2654

CHECK IMPULSE TUBE

Next: p2658, !f2657

OVERHEAT THERMOSTAT RESISTANCE

REMOVE ONE OR BOTH

Next: p2662, f2659

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2669, f2664

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p2671, !f2670

CONDENSATE TRAP AND DRAIN

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

Next: p2710, !f2673

CHECK IMPULSE TUBE

Next: p2676, !f2677

OVERHEAT THERMOSTAT RESISTANCE

REMOVE ONE OR BOTH

Next: p2678, f2679

RESISTANCE GAS VALVE AND HARNESS

REMOVE THE 12 WAY CONNECTOR FROM THE FRONT OF THE PCB

Next: p2682, f2683

VOLTAGE GAS VALVE AT PCB

BOILER ON/OFF SWITCH ON

Next: p2686, !f2687

CONDENSATE TRAP AND DRAIN

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

Next: p2713, !f2689

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2711, !f2712

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: !p2714, !f2715

RESISTANCE DRY FIRE THERMISTOR AND HARNESS

ENSURE THE BOILER IS COOL
REMOVE THERMISTOR CONNECTOR FROM PCB

Next: p2717, f2718

CAN SYSTEM BE RESET BY POWER OFF/ON

Next: p2721, !f2722

IS SYSTEM FILLED AND VENTED

Next: !p2723, !f2724

VOLTAGE AT SPARK GENERATOR - BLUE

USE INSULATION MAT AS REQUIRED

Next: p2736, f2737

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p2732, f2733

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p2746, f2747

HARNESS CONTINUITY PCB TO SPARK GEN- BLUE

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p2781, !f2782

VOLTAGE AT SPARK GENERATOR - BLUE

USE INSULATION MAT AS REQUIRED

Next: p2761, f2762

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p2757, f2758

ELECTRODE AND LEAD CONTINUITY

MAKE SURE HT LEAD IS CLICKED ON TO THE ELECTRODE PROPERLY

Next: !p2771, f2772

HARNESS CONTINUITY PCB TO SPARK GEN- BLUE

UNPLUG THE CONNECTOR FROM THE PCB

Next: !p2792, !f2790

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2796, !f2797

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p2798, !f2799

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p2800, !f2801

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p2802, !f2803

POTENTIOMETER RESISTANCE (DHW)

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

Next: p2804, !f2805

PUMP LIMPET

Next: p2806, !f2807

PRESSURE GAS INLET (DHW)

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

Next: p2808, !f2809

TEMPERATURE DIFFERENTIAL DHW

TURN HOT WATER TAP ON

Next: p2810, f2811

TEMPERATURE DHW AT APPLIANCE AND OUTLET (MIXER TAP PASSING)

Next: p2816, !f2817

BURNER INJECTOR

REMOVE THE BURNER INJECTOR FROM ITS HOUSING

Next: p2818, !f2819

CONDENSATE TRAP AND DRAIN

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

Next: p2820, !f2821

BURNER CONDITION

REMOVE FAN
REMOVE THE BURNER

Next: p2822, !f2823

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p2824, !f2825

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p2827, f2828

VOLTAGE PERMANENT FAN HALL SENSOR

NO DEMANDS FOR CH OR

Next: p2845, f2846

VOLTAGE FAN POWER AT PCB

GAIN ACCESS TO BOTTO

Next: p2835, f2836

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2833, !f2834

RESISTANCE FAN HARNESS

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

Next: !p2843, !f2844

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2839, !f2840

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2841, !f2842

VOLTAGE FAN AT PCB

DISCONNECT DHW THERM

Next: p2851, f2852

RESISTANCE FAN

DISCONNECT THE FAN HARNESS FROM FAN

Next: !p2849, !f2850

RESISTANCE FAN HARNESS

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

Next: !p2859, !f2860

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p2855, !f2856

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: !p2857, !f2858

PUMP LIMPET

Next: p393, !f396

CH OPERATION

BOILER MAINS SWITCH ON
BOILER CH THERMOSTAT TO MAX
CH DEMAND

Next: !p394, !f395

OVERHEAT THERMOSTAT RESISTANCE

REMOVE ONE OR BOTH

Next: p407, !f416

RESISTANCE CONTROL THERMISTOR FLOW

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

Next: p408, !f409

RESISTANCE CONTROL THERMISTOR RETURN

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

Next: p410, !f417

RESISTANCE DRY FIRE THERMISTOR

DISCONNECT THE DRY FIRE SENSOR LEADS

Next: p412, !f413

RESISTANCE DHW THERMISTOR

DISCONNECT THE INLINE CONNECTOR FROM THE DHW THERMISTOR

Next: p2519, !f415

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
CH 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, f2041

RESISTANCE CONTROL THERMISTOR FLOW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p670, f671

RESISTANCE CONTROL THERMISTOR RETURN AND HARNESS

REMOVE PLUG FROM PCB

Next: !p666, f667

RESISTANCE CONTROL THERMISTOR DHW AND HARNESS

REMOVE PLUG FROM PCB

Next: !p2793, f663

GAS INLET PRESSURE

ENSURE SECONDARY HEA

Next: p1409, !f703

System Information

  • Total Tests: 917
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control