XSol Diagnostic System

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

BAXI DUO TEC / PLATINUM COMBI ERP & POTTERTON GOLD / TITANIUM / PROMAX COMBI ERP

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

CASE OFF

OUTER CASE REMOVA

Next: &1045, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &7, !f4

FAULT CODES

FAULT CODES

Next: &95, !f8

DHW FLOW RATE

Next: &105, f96

DOES FAN RUN ON DHW DEMAND

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: &334, f106

BURNER IGNITES AND ESTABLISHES

{SELHWCHON}

Next: &248, ?186, ?188, ?190, ?192, ?2048

OPERATION DHW

Next: &357, ?249, ?251, ?253, ?257, ?1797

DOES PUMP RUN ON HW DEMAND

Next: &185, f1863

OPERATION CH

{SELHWCHON}
FLOW AND RETURN VALVES FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: &nff, ?358, ?360, ?362, ?368, ?422

OVERHEAT INVESTIGATION

OUT OF MODEL

Next: &nff, f1975

E20 FAULT CODE

OUT OF MODEL

Next: &nff, f585

E50 FAULT CODE

OUT OF MODEL

Next: &nff, f591

E119 FAULT CODE

OUT OF MODEL

Next: &nff, f598

E125 FAULT CODE

OUT OF MODEL

Next: &nff, f628

E160 FAULT CODE

OUT OF MODEL

Next: &nff, f721

FUSE FURTHER INVESTIGATION

OUT OF MODEL

Next: &nff, f806

E168 FAULT CODE

E168 FAULT CODE
T

Next: &nff, f1615

E156 FAULT CODE

Next: &nff, !f1022

POWER UP

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &1093, ?1465, ?1467

BOILER ENTERS STANDBY MODE

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &3, ?1094, ?1098, ?1368

E164 FAULT CODE

OUT OF MODEL

Next: &nff, f1176

E28 FAULT CODE

NOT USED - HEADER FOR F28 FAULT CODE OUTSIDE MODEL

Next: &nff, f2187

E130 FAULT CODE

OUT OF MODEL

Next: &nff, f2257

SF OR P CALIBRATION FUNCTION

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f2310

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f2314

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f2316

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2318

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2322

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2326

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2330

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2334

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2338

HEADER FOR QADAI FAN AC VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2342

HEADER FOR QADAI FAN AC RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2346

HEADER FOR DIVERTER VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2350

HEADER FOR QADAI DHW SENSOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2354

HEADER FOR QADAI FLUE THERMISTOR

Next: &nff, f2358

TEMP LOW

SENSOR NTC - FLOW

Next: End

E156

MAINS VOLTAGE LESS THAN 180VAC

Next: End

OPEN CIRCUIT

CABLE - ELECTRODE - FLAME SENSING

Next: End

NO MOVEMENT

FLOW REGULATOR

Next: End

NO SELECTOR SWITCH VOLTAGESTANDY BY MODE

PCB

Next: End

NO AC VOLTAGESTANDY BY MODE

WIRING -FAN/IGNITER

Next: End

FAN SUPPLY DC

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NO FAN DC

PCB

Next: End

FAN DOES NOT RUN

PCB

Next: End

NO PRESSURE E119E164

SYSTEM PRESSURE

Next: End

BLOCKED E119E164

SWITCH - PRESSURE - HEATING

Next: End

E164 - RUNNING SLOW

PUMP

Next: End

NO SIGNAL

WIRING - DHW PRIORITY/SENSOR

Next: End

STANDBY

FAN ASSEMBLY

Next: End

POOR FLOW RATE

FLOW REGULATOR

Next: End

FROST PROTECTION

SENSOR NTC - DHW

Next: End

MAKING FLOW SWITCH

HOT WATER TAP OR PIPEWORK

Next: End

STUCK MADE

FLOW REGULATOR

Next: End

STUCK MADE

SENSOR - HALL EFFECT

Next: End

SHORTED GIVING DEMAND

WIRING - DHW PRIORITY/SENSOR

Next: End

FROST PROTECTION

SENSOR NTC - FLOW

Next: End

CH NO DEMAND

PCB

Next: End

HW+CHFROST STANDBY MODE

PCB

Next: End

BLOWN STAND BY MODE AT POWER UPB4 OP SEQ

FUSE 3AMP

Next: End

BLOWN STANDBY MODE AT POWER UPFAN DOESNT RUNB4 OP SEQ

FUSE 2 AMP (LIVE)

Next: End

BLOWNB4 OP SEQ

FUSE 2 AMP (NEUTRAL)

Next: End

BLANK DISPLAYB4 OP SEQ

SENSOR - HALL EFFECT

Next: End

BLANK DISPLAYB4 OP SEQ

WIRING - DHW PRIORITY/SENSOR

Next: End

BLACK DISPLAYB4 OP SEQ

FAN ASSEMBLY

Next: End

LED AT POWER UPB4 OP SEQ

PCB

Next: End

ERRATIC TEMPERATURE DISPLAY

SENSOR NTC - FLOW

Next: End

NOT RESPOND TO DC FROM FANE160

PCB

Next: End

NO PERMANENT VOLTAGE TO FAN

PCB

Next: End

FAN NOT RUNNING

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NOT RESPONDING TO FAN

PCB

Next: End

FAN NOT RUNNING E160

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NO PERMANENT VOLTAGE TO FAN E160

PCB

Next: End

NOT RESPONDING TO FAN E160

PCB

Next: End

NO AC VOLTAGESTANDY BY MODE BLANK DISPLAY

WIRING -FAN/IGNITER

Next: End

FAN NOT RUNNING BLANK DISPLAY

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NO PERMANENT VOLTAGE TO FAN BLANK DISPLAY

PCB

Next: End

NOT RESPONDING TO FAN BLANK DISPLAY

PCB

Next: End

FAN SUPPLY DC BLANK DISPLAY

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NO FAN DC BLANK DISPLAY

PCB

Next: End

STANDBY BLANK DISPLAY

FAN ASSEMBLY

Next: End

E168

GAS VALVE

Next: End

E168

MOTOR (DIVERTER)

Next: End

E168

SPARK GENERATOR

Next: End

E168 AC

FAN ASSEMBLY

Next: End

E168 DC

FAN ASSEMBLY

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

SENSOR NTC - FLOW

Next: End

FAN RUNSNO SUPPLY VOLTAGEFANE168

DEVICE - SAFETY - FLUE

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

THERMOSTAT - LIMIT

Next: End

NO FANNO SUPPLY VOLTAGEFANE168

SENSOR NTC - DHW

Next: End

NO PRESSUREE168

SYSTEM PRESSURE

Next: End

BLOCKEDE168

SWITCH - PRESSURE - HEATING

Next: End

E168

KIT - ELECTRODE - IGNITION

Next: End

E168

KIT - ELECTRODE - IONISATION

Next: End

INSUFFICIENT

WATER SUPPLY

Next: End

OPERATION CH - NOISY

RETURN FILTER

Next: End

OPERATION DHW - DHW COOL RADS COOL

PUMP

Next: End

COOL HW

SENSOR NTC - DHW

Next: End

DHW COOL RADS COOL

SENSOR NTC - FLOW

Next: End

BLOCKAGE

DIVERTER VALVE BODY

Next: End

DOES FAN RUN ON DHW DEMAND

SWITCH - AIR PRESSURE

Next: End

OPERATION DHW - FAULT CODE

SYSTEM PRESSURE

Next: End

OPERATION DHW - FAULT CODE

PUMP

Next: End

OPERATION DHW - FAULT CODE

SENSOR NTC - FLOW

Next: End

E168

SWITCH - AIR PRESSURE

Next: End

FUSE INVESTIGATION

RELAY - PCB

Next: End

OPERATION DHW - FAULT CODE - WATERWAYS

HEAT EXCHANGER PRIMARY

Next: End

OBSERVATION PUMP RUNS

PCB

Next: End

POWER UP

RELAY - PCB

Next: End

NO FANB4 OP SEQ

SWITCH - SELECTOR 4 POSITION

Next: End

BLOCKED

PIPE - PRESSURE SWITCH

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

FAULTY SOLENOIDS

GAS VALVE

Next: End

BURNER DOES NOT IGNITE - NO DROP

FLUE

Next: End

NO DROP

PRESSURE SENSING VENTURI

Next: End

BURNER DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

BLOCKEDBLOCKED

BODY - CONDENSER SIPHON/PRIMER

Next: End

BURNER DOES NOT IGNITE - DROP

FLUE

Next: End

SPARKING WRONG POSITION

KIT - ELECTRODE - IGNITION

Next: End

CHOKEDBLOCKED

BURNER

Next: End

BURNER DOES NOT IGNITEBLOCKED

HEAT EXCHANGER PRIMARY

Next: End

BLOCKED OR RESTRICTED

PRESSURE SENSING VENTURI

Next: End

NO SPARKING

LEAD - IGNITION ELECTRODE AND EARTH

Next: End

NO RECTIFICATION VOLTAGE

PCB

Next: End

NO SPARK

WIRING -FAN/IGNITER

Next: End

NO POWER TO SPARK GEN

PCB

Next: End

NO SPARKING WITH LEAD

PCB

Next: End

NO RESET OVERHEAT

SWITCH - SELECTOR 4 POSITION

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANOH

THERMOSTAT - LIMIT

Next: End

F5 FAULT CODE

PUMP

Next: End

OVERHEAT

SENSOR NTC - FLOW

Next: End

OVERHEAT

SENSOR NTC - DHW

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

NO CH VOLTAGE

PCB

Next: End

DIVERTER CH

WIRING - PUMP/GAS VALVE

Next: End

OVERHEAT

RETURN FILTER

Next: End

NO CH VOLTAGE DHW DIFF OK

PCB

Next: End

DIVERTER CH DHW DIFF OK

WIRING - PUMP/GAS VALVE

Next: End

OVERHEAT DHW DIFF OK

RETURN FILTER

Next: End

E125

DEVICE - SAFETY - FLUE

Next: End

BURNER BAFFLES OUT

GAS INLET PRESSURE

Next: End

E125 FAULT CODE

RETURN FILTER

Next: End

RESRICTIONE125

HEAT EXCHANGER 20 PLATES - DHW

Next: End

DHW COOL

DIVERTER VALVE BODY

Next: End

POOR DHW

BURNER

Next: End

OPERATION DHW - DHW COOL RADS COOL - FLUEWAYS

HEAT EXCHANGER PRIMARY

Next: End

OPERATION DHW - DHW COOL RADS COOL

FLUE

Next: End

BLOCKED 2

BODY - CONDENSER SIPHON/PRIMER

Next: End

EXPLOSIVE IGNITIOJN

GAS INLET PRESSURE

Next: End

EXPLOSIVE IGNITION

LEAD - IGNITION ELECTRODE

Next: End

EXPLOSIVE IGNITION

PIPE - PRESSURE SWITCH

Next: End

EXPLOSIVE IGNITION

BODY - CONDENSER SIPHON/PRIMER

Next: End

EXPLOSIVE IGNITION

FLUE

Next: End

EXPLOSIVE IGNITION

KIT - ELECTRODE - IGNITION

Next: End

EXPLOSIVE IGNITION

BURNER

Next: End

EXPLOSIVE IGNITION

HEAT EXCHANGER PRIMARY

Next: End

EXPLOSIVE IGNITION

PRESSURE SENSING VENTURI

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

NOT ESTABLISHING

BODY - CONDENSER SIPHON/PRIMER

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB

WIRING - PUMP/GAS VALVE

Next: End

BURNER BAFFLES OUT

FLUE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB OVERHEAT

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP OVERHEAT

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS OVERHEAT

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS E125

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E125

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E125

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS E125

RELAY - PCB

Next: End

FUSE2

WIRING - PUMP/GAS VALVE

Next: End

E168

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS E164

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E164

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E164

WIRING - PUMP/GAS VALVE

Next: End

OBSERVATION PUMP RUNS E164

RELAY - PCB

Next: End

NO CH SWITCH

SWITCH - SELECTOR 4 POSITION

Next: End

EXTERNAL CONTROLS TO PCB SECTION

Next: End

E28

DEVICE - SAFETY - FLUE

Next: End

E28 TRAP BACKED UP

BODY - CONDENSER SIPHON/PRIMER

Next: End

E28

HOSE - PRESSURE SWITCH

Next: End

E28 FAULT CODE

DEVICE - SAFETY - FLUE

Next: End

E28

SWITCH - AIR PRESSURE

Next: End

FAULT CODE DHW OP

DEVICE - SAFETY - FLUE

Next: End

FAULT CODE DHW OP

SWITCH - AIR PRESSURE

Next: End

OPERATION DHW - FAULT CODE

SWITCH - AIR PRESSURE

Next: End

FAULT CODE DHW

BODY - CONDENSER SIPHON/PRIMER

Next: End

FAULT CODE DHW OP

HOSE - PRESSURE SWITCH

Next: End

FAULT CODE DHW

FLUE

Next: End

FAULT CODE DHW

BURNER

Next: End

FAULT CODE DHW OP

HEAT EXCHANGER PRIMARY

Next: End

NO RESET E130

SWITCH - SELECTOR 4 POSITION

Next: End

FAN RUNSNO SUPPLY VOLTAGEFANE130

DEVICE - SAFETY - FLUE

Next: End

E130

BODY - CONDENSER SIPHON/PRIMER

Next: End

CHOKEDBLOCKEDE130

BURNER

Next: End

BURNER DOES NOT IGNITEBLOCKEDE130

HEAT EXCHANGER PRIMARY

Next: End

E130 FAULT CODE

SWITCH - SELECTOR 4 POSITION

Next: End

E130

DEVICE - SAFETY - FLUE

Next: End

E130

SWITCH - AIR PRESSURE

Next: End

E130 FAULT CODE

SWITCH - AIR PRESSURE

Next: End

E130 FAULT CODE

BODY - CONDENSER SIPHON/PRIMER

Next: End

E130

HOSE - PRESSURE SWITCH

Next: End

E130

BURNER

Next: End

E130

HEAT EXCHANGER PRIMARY

Next: End

DHW OP FAULT CODE

FLUE

Next: End

DHW OP FAULT CODE

BURNER

Next: End

DHW OP FAULT CODE

HEAT EXCHANGER PRIMARY

Next: End

FAULT CODE DHW

DEVICE - SAFETY - FLUE

Next: End

E28

FLUE

Next: End

STUCK IN CALIBRATION MODE

PCB

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

SENSOR NTC - FLOW

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO POWER TO GAS VALVE

PCB

Next: End

QADAI

SPARK GENERATOR

Next: End

QADAI

PUMP

Next: End

QADAI NO POWER TO FAN AC

PCB

Next: End

QADAI AC

FAN ASSEMBLY

Next: End

QADAI

MOTOR (DIVERTER)

Next: End

QADAI

SENSOR NTC - DHW

Next: End

QADAI

DEVICE - SAFETY - FLUE

Next: End

QADAI NO POWER TO PUMP

RELAY - PCB

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR NTC - DHW

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR NTC - FLOW

Next: End

PREHEAT SATISFACTORY3

DIVERTER VALVE BODY

Next: End

BLOCKED PREHEAT SAT3

HEAT EXCHANGER 20 PLATES - DHW

Next: End

FAN RUNSDHW OPERATION DHW TOO HOT

SENSOR NTC - DHW

Next: End

FLAME BAFFLES

HEAT EXCHANGER PRIMARY

Next: End

DHW HOT THEN COLD

PUMP

Next: End

UNDER PRESSURE

VESSEL 8L

Next: End

CLOSED

TAP - ISOLATION - FLOW / RETURN

Next: End

RADS COOL

PUMP

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

BYPASS

DIVERTER VALVE BODY

Next: End

BLOCKED

RETURN FILTER

Next: End

NOISY BOILER

DIVERTER VALVE BODY

Next: End

BOILER NOISY

SENSOR NTC - FLOW

Next: End

NO SUPPLY

Next: End

NO CH 2

PCB

Next: End

MISSING

CABLE - INTEGRAL TIMER

Next: End

LOW TEMP

GAS INLET PRESSURE

Next: End

UNABLE TO SET

GAS VALVE

Next: End

NO CH VOLTAGETEST

PCB

Next: End

DIVERTER CHTEST

WIRING - PUMP/GAS VALVE

Next: End

DIVERTOR

WIRING - PUMP/GAS VALVE

Next: End

VOLTAGE DIVERTER

PCB

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE20

SENSOR NTC - FLOW

Next: End

NO FANNO SUPPLY VOLTAGEFANE50

SENSOR NTC - DHW

Next: End

NO PRESSURE E119

SYSTEM PRESSURE

Next: End

BLOCKED E119

SWITCH - PRESSURE - HEATING

Next: End

E125 - RUNNING SLOW

PUMP

Next: End

E125

SENSOR NTC - FLOW

Next: End

E125

SENSOR NTC - DHW

Next: End

NO RESET

SWITCH - SELECTOR 4 POSITION

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

SENSOR NTC - FLOW

Next: End

NO FANNO SUPPLY VOLTAGEFAN

SENSOR NTC - DHW

Next: End

NO PRESSURE

SYSTEM PRESSURE

Next: End

BLOCKED

SWITCH - PRESSURE - HEATING

Next: End

FAN RUNSNO SUPPLY VOLTAGEFAN

DEVICE - SAFETY - FLUE

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

THERMOSTAT - LIMIT

Next: End

E160

WIRING -FAN/IGNITER

Next: End

E160

PCB

Next: End

E160

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

NO DC SUPPLY TO FANE160

PCB

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN SIGNAL E160

FAN ASSEMBLY

Next: End

FUSE FURTHER INVESTIGATION

GAS VALVE

Next: End

DC HARNESS

FAN ASSEMBLY

Next: End

FUSE BLOWING

MOTOR (DIVERTER)

Next: End

FUSE BLOWING

FAN ASSEMBLY

Next: End

POOR FLOW RATE

TAP - ISOLATION - DHW INLET

Next: End

WATER PRESSURE E119

WIRING - DHW PRIORITY/SENSOR

Next: End

LOW SYSTEM TEMP POT

PCB

Next: End

FAULTY

KIT - ELECTRODE - IONISATION

Next: End

NO RETIFICATION

PCB

Next: End

NO MOVEMENT

SENSOR - HALL EFFECT

Next: End

VOLTS TO TURBINE

PCB

Next: End

NO DISPLAY NO FANSTANDY BY MODE

PCB

Next: End

NO FANSTANDY BY MODE

SWITCH - SELECTOR 4 POSITION

Next: End

E119 FAULTE164

PCB

Next: End

WATER PRESSURE E119E164

WIRING - DHW PRIORITY/SENSOR

Next: End

NO FAN SUPPLY SPEED

PCB

Next: End

DHW

FROST PROTECTION

Next: End

SENSING DHW DEMAND WHEN NONE PRESENT

PCB

Next: End

FIRING NO DEMAND

Next: End

NO DEMAND

INTEGRAL TIMER / WIRELESS CONTROLS

Next: End

SUPPLY FAULT AT POWER UPB4 OP SEQ

Next: End

FURTHER INVESTIGATION F1B4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER IN VESTIGATION F2FAN DOESNT RUNB4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION F3B4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK DISPLAYB4 OP SEQ

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

FURTHER INVESTIGATION LED PCB FAULT

Z DIRECTION CHOICE OR CONTINUE

Next: End

ERRATIC TEMPERATURE DISPLAY

PCB

Next: End

ERRATIC TEMPERATURE DISPLAY

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

RUNNING SLOW

FAN ASSEMBLY

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE

FAN ASSEMBLY

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE E160

FAN ASSEMBLY

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE BLANK DISPLAY

FAN ASSEMBLY

Next: End

NO FAN SUPPLY SPEED BLANK DISPLAY

PCB

Next: End

E168 GAS VALVE

WIRING - PUMP/GAS VALVE

Next: End

DIVERTOR E168

WIRING - PUMP/GAS VALVE

Next: End

E168 IGNITER

WIRING -FAN/IGNITER

Next: End

E168 AC

WIRING -FAN/IGNITER

Next: End

E168 FAN DC

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

PRIMARYNO SUPPLY VOLTAGEFANE168

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

OH STATE168

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

DHW SENSORNO SUPPLY VOLTAGEFANE168

WIRING - DHW PRIORITY/SENSOR

Next: End

WATER PRESSURE SWITCHE168

WIRING - DHW PRIORITY/SENSOR

Next: End

NOT RECONISING DEMANDE168

PCB

Next: End

OPERATION DHW HOT COLD

PCB

Next: End

BLOCKED

HEAT EXCHANGER 20 PLATES - DHW

Next: End

OPERATION DHW - HOT COLD

HEAT EXCHANGER PRIMARY

Next: End

FLUE STAT

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

FLUE STATE168

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

FUSE INVESTIGATION

CABLE - POWER SUPPLY

Next: End

OPERATION DHW - FAULT CODE

THERMOSTAT - LIMIT

Next: End

OPERATION DHW - FAULT CODE

PCB

Next: End

OPERATION DHW - FAULT CODE

HEAT EXCHANGER 20 PLATES - DHW

Next: End

NO DISPLAY NO FANB4 OP SEQ

PCB

Next: End

DISPLAY DOES NOT ILLUMINATE

CABLE - POWER SUPPLY

Next: End

POWER UP

WIRING - CONNECTOR/SELECTOR SWITCH

Next: End

SPARKING NO IGNITION

GAS INLET PRESSURE

Next: End

NO GV VOLTAGE

PCB

Next: End

GAS VALVE HARNESS DAMAGED PCB

PCB AND WIRING - PUMP/GAS VALVE

Next: End

GV VOLTAGEPASS

WIRING - PUMP/GAS VALVE

Next: End

NOT OPENING RESISTANCE OK

GAS VALVE

Next: End

MECHANICALPASS

GAS VALVE

Next: End

SPARKING OCCURS

KIT - ELECTRODE - IGNITION

Next: End

NO SPARK - RESISTANCE

SPARK GENERATOR

Next: End

NO SPARK

SPARK GENERATOR

Next: End

BOILER WONT RESET

PCB

Next: End

OH STATOH

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

RESRICTION

HEAT EXCHANGER 20 PLATES - DHW

Next: End

NOT MOVING TO CH

MOTOR (DIVERTER)

Next: End

1F5FAULT 2

Next: End

NOT MOVING TO CH DHW DIFF OK

MOTOR (DIVERTER)

Next: End

1F5FAULT 2 DHW DIFF OK

Next: End

OVERHEAT

TEMPERATURE OVERHEAT

Next: End

EXCESSIVE TEMP

PCB

Next: End

CUTTING OFF

THERMOSTAT - LIMIT

Next: End

E125 FLUE STAT

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

RESTRICTEDE125

HEAT EXCHANGER PRIMARY

Next: End

ALL OKAY

BOILER LOCKOUT

Next: End

DHW TEMP LOW

HEAT EXCHANGER 20 PLATES - DHW

Next: End

OPERATION DHW - DHW COOL RADS COOL - WATERWAYS

HEAT EXCHANGER PRIMARY

Next: End

INCORRECT GAS RATE

GAS VALVE

Next: End

EXPLOSIVE IGNITION

SPARK GENERATOR

Next: End

EXPLOSIVE IGNITION

GAS VALVE

Next: End

FLAME BAFFLING

GAS VALVE

Next: End

OBSERVATION PUMP RUNS

PUMP

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PUMP

Next: End

OBSERVATION PUMP RUNS E125

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

E168

PUMP

Next: End

OBSERVATION PUMP RUNS E164

PUMP

Next: End

SECTION TO EXTERNAL CONTROLS

Next: End

E28 FAULT CODE

PCB

Next: End

E28

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

E28 FAULT CODE

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

DHW OP FAULT CODE

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

DHW OP FAULT CODE

PCB

Next: End

NO RESETE130

PCB

Next: End

E130

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

E130

FLUE

Next: End

E130 FAULT CODE

PCB

Next: End

E130 FAULT CODE

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

E130 FAULT CODE

FLUE

Next: End

OP DHW FAULT CODE

PCB

Next: End

FAULT CODE DHW

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

E28

PCB

Next: End

NORMAL OPERATION

CALIBRATION FUNCTION

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

PCB POWER TO GAS VALVE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO FAN AC

RESULT AS EXPECTED

Next: End

FAN AC

RESULT AS EXPECTED

Next: End

DIVERTER VALVE HEAD

RESULT AS EXPECTED

Next: End

DHW SENSOR

RESULT AS EXPECTED

Next: End

SENSOR FLUE

RESULT AS EXPECTED

Next: End

LETBY PREHEAT3

DIVERTER VALVE BODY

Next: End

TEMPERATURE CONTROL DHW

PCB

Next: End

EXPANSION CONNECTION

BLOCKAGE

Next: End

OPEN VENT SYSTEMCH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

NO CH

PCB

Next: End

NO SWITCH BACK

INTEGRAL TIMER / WIRELESS CONTROLS

Next: End

NO CH3

PCB

Next: End

NOT MOVING TO CHTEST

MOTOR (DIVERTER)

Next: End

PREHEAT SATISFACTORY3

MOTOR (DIVERTER)

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

CH OPERATION NOISY

HEAT EXCHANGER PRIMARY

Next: End

CH OPERATION NOISEY

Next: End

PRIMARYNO SUPPLY VOLTAGEFANE20

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

E20

PCB

Next: End

DHW SENSORNO SUPPLY VOLTAGEFANE50

WIRING - DHW PRIORITY/SENSOR

Next: End

E50

PCB

Next: End

E119 FAULT

PCB

Next: End

E125 NO RESET

PCB

Next: End

PRIMARYNO SUPPLY VOLTAGEFAN

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

DHW SENSORNO SUPPLY VOLTAGEFAN

WIRING - DHW PRIORITY/SENSOR

Next: End

WATER PRESSURE SWITCH

WIRING - DHW PRIORITY/SENSOR

Next: End

NOT RECONISING DEMAND

PCB

Next: End

OH STAT

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

PCB FUSE BLOWING

FUSE GONE PCB

Next: End

FUSE

WIRING - PUMP/GAS VALVE

Next: End

FUSE

HARNESS FAN OH STAT FLUE THERMISTOR

Next: End

FUSE GAS VALVE

WIRING - PUMP/GAS VALVE

Next: End

FUSE

WIRING -FAN/IGNITER

Next: End

POOR FLOW RATE

HEAT EXCHANGER 20 PLATES - DHW

Next: End

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM DHW FLOW SWITCH OPERATION

Next: !p109

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1095

FAN DOES NOT RUN ON SELF CHECK

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1099

VOLTAGE STAYS THE SAME

CHARACTERISTIC TEST FROM DHW FLOW SWITCH OPERATION

Next: p1287

DHW OR CH DEMAND LED ILLUMINATED

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1430

DISPLAY DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM POWER UP

Next: p1469

DISPLAY ILLUMINATES BUT TEMPERATURE DISPLAYED ERRATIC

CHARACTERISTIC TEST FROM POWER UP

Next: p1516

FAN RUNS CONTINUOUSLY AT HIGH SPEED

CHARACTERISTIC TEST FROM FAN RUNS SELF CHECK

Next: p1491

FAN DOESN'T RUN

CHARACTERISTIC TEST FROM FAN RUNS SELF CHECK

Next: p1493

FAULT CODE OCCURS DURING OPERATION

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1798

DIFFERENTIAL OK BUT TEMPERATURE ON FLOW ABOVE 90 DEGREES

CHARACTERISTIC TEST FROM DIFFERENTIAL HEAT EXCHANGER ON DHW

Next: !p1858

DIFFERENTIAL NOT OK

CHARACTERISTIC TEST FROM DIFFERENTIAL HEAT EXCHANGER ON DHW

Next: p1860

SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p1927

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p1962

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p191

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p193

GAS INLET PRESSURE LOW OR DROPS BELOW MINIMUM

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p1933

GAS INLET PRESSURE OK BUT DOES NOT DROP

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p1935

BOILER TEMP GOES ABOVE 90 DEGREES AND DOESNT CUT OFF

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2021

BOILER LOCKS OUT ON OVERHEAT BEFORE REACHING 85 DEGREES

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2023

EXPLOSIVE OR DELAYED IGNITION

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p2049

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p250

DHW COOL RADS COOL

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p252

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p254

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p258

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p359

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p361

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1014

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p369

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH

Next: p423

VOLTAGE MISSING

CHARACTERISTIC TEST FROM VOLTAGE FROM INTEGRAL TIMER

Next: p430

NO INTEGRAL TIMER FITTED

CHARACTERISTIC TEST FROM VOLTAGE FROM INTEGRAL TIMER

Next: p434

TEMP DIFFERENTIAL NOT OK LOCAL BOILING

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p570

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p572

27/06/2022 15:35:05 2205_1_50_1 20/10/2022 11:23:00

23/08/2022 14:21:06

Next: End

RESISTANCE DETECTION LEAD

REMOVE BOTH ENDS OF THE FLAME SENSE HARNESS, FROM THE ELECTRODE AND FROM X501 ON THE PCB

Next: !p1027, !f1026

DHW FLOW SWITCH OPERATION

SELECTOR SWITCH TO HOT WATER AND HEATING
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p107, ?108, ?110

VOLTAGE SELECTOR SWITCH

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: !p1102, f1103

VOLTAGE SELECTOR SWITCH INPUT

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: !p1104, !f1105

SYSTEM PRESSURE CHECK

Next: p1183, !f1178

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p1181, !f1182

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p1433, !f1434

OBSERVATION WHICH DEMAND LED IS ILLUMINATED

Next: p1455, f1432

VOLTAGE FROM SWITCH LIVE

{SELHWCHON}
NO DEMANDS FOR CH
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1460, !f1461

RESISTANCE FUSE F1 (FUSED SPUR)

Next: !p1472, f1473

FUSE FURTHER INVESTIGATION F1

Next: !p1474, !f1475

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE CONTROL BOX COVER
REMOVE THE FUSE AND HOLDER FROM THE LIVE (BROWN)

Next: p1478, f1479

FUSE FURTHER INVESTIGATION F2

Next: !p1480, !f1481

RESISTANCE FAN (DC)_FUSE

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p1506, !f1507

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p1519, !f1520

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1616, f1617

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2149, !f2148

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1622, !f1623

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p1626, !f1627

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p1630, !f1631

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p1634, !f1635

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p1637, !f1638

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p1642, !f1643

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p1826, !f1672

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p1674, !f1675

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p1679, !f1680

SYSTEM PRESSURE CHECK

Next: p1682, !f1683

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
TURN

Next: !p1775, f1776

DIVERTER VALVE BLOCKAGE

ISOLATE COLD MAINS I

Next: !p1777, !f1778

RESISTANCE PUMP PCB

DISCONNECT WIRES FROM PUMP PCB

Next: !p1854, !f1853

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2105, !f1865

VOLTAGE MAINS INTO CONTROL PCB

{SELHWCHON}

Next: !p1920, f1911

VOLTAGE MAINS IN PUMP PCB

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: p1912, f1913

RESISTANCE SELECTOR SWITCH MAINS

DISCONNECT THE BROWN WIRES FROM THE SELECTOR SWITCH
SELECTOR SWITCH IN CH & HW MODE

Next: !p1926, !f1925

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: !p1938, f1939

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1940, !f1941

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1944, !f1945

RESISTANCE SPARK GENERATOR AND LEADS

REMOVE SPARK LEAD AND EARTH WIRE FROM ELECTRODE

Next: p1965, f1966

RESISTANCE ELECTRODE LEAD

REMOVE SPARK AND EARTH LEADS FROM ELECTRODE AND SPARK GENERATOR

Next: !p1967, !f1968

BOILER RESET

Next: p1976, f1977

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: p1978, !f1979

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p1982, !f1983

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
TURN

Next: !p1998, f1999

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p2000, f2001

VOLTAGE DIVERTER VALVE PCB CH

SELECTOR SWITCH TO H

Next: p2002, !f2003

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p2010, f2011

VOLTAGE DIVERTER VALVE PCB CH

SELECTOR SWITCH TO H

Next: p2012, !f2013

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2027, !f2028

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2031, !f2032

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
TURN

Next: !p2038, f2039

DIVERTER VALVE BLOCKAGE

ISOLATE COLD MAINS I

Next: !p2040, !f2041

RESISTANCE ELECTRODE LEAD

REMOVE SPARK AND EARTH LEADS FROM ELECTRODE AND SPARK GENERATOR

Next: !p2054, !f2055

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2129, !f2130

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2138, !f2139

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2151, !f2152

VOLTAGE FROM SELECTOR SWITCH AT SELECTOR SWITCH

Next: !p2171, !f2172

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p2188, f2189

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2190, f2191

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2192, !f2193

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2227, !f2228

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p2232, f2233

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2295, f2302

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2240, !f2241

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p2258, f2259

BOILER RESET

Next: p2260, f2261

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: p2262, !f2263

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2266, !f2267

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: p2276, !f2277

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2280, !f2281

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2303, !f2304

OBSERVATION CAN CALIBRATION FUNCTION BE DISABLED

Next: !p2311, !f2312

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p2319, !f2320

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2323, !f2324

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HOT WATER AND HEATING
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2327, !f2328

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p2331, !f2332

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: !p2335, !f2336

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2339, !f2361

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2343, !f2344

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2347, !f2348

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p2351, !f2352

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p2355, !f2356

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2359, !f2360

VOLTAGE DIVERTER VALVE PCB

SELECTOR SWITCH TO HOT WATER AND HEATING
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p563, !f566

VOLTAGE DIVERTER VALVE PCB CH

SELECTOR SWITCH TO H

Next: p556, !f557

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB.

Next: !p589, f586

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p587, !f588

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p595, f592

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p593, !f594

SYSTEM PRESSURE CHECK

Next: p606, !f600

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p1001, !f614

BOILER RESET

Next: p642, f655

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p656, !f657

IS FAN RUNNING

{SELHWCHON}

Next: p722, f723

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p791, !f792

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p771, !f772

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p775, !f776

SYSTEM PRESSURE CHECK

Next: p779, !f780

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p1785, !f786

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p789, !f790

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p807, f808

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p831, !f810

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2146, !f2147

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p830, !f818

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p896, !f897

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p828, !f826

DHW ISOLATING VALVE

Next: p1692, !f98

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p1020, !f1016

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE MAINS WATER

Next: !p1030, !f1031

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p768, !f113

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1114, !f1115

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1100, f1101

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1539, !f1107

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1116, !f1117

VOLTAGE DC FAN SPEED ON START UP

Next: !p1306, !f1307

VOLTAGE DC FAN DEMAND START-UP

Next: !p1549, !f1550

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p1179, f1180

DOES PUMP RUN

Next: p1189, f2150

PUMP LIMPET TEST

Next: p1177, !f1201

RESISTANCE DHW FLOW SWITCH HARNESS

REMOVE CONNECTOR X400 FROM PCB AND CONNECTOR FROM THE HALL SENSOR ON THE FLOW SWITCH

Next: p1029, !f1291

IS BOILER TEMP LOW

Next: !p1431, f1443

OBSERVATION ISOLATE DHW DOES DHW DEMAND STOP

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE

Next: p1435, !f1436

OBSERVATION REMOVE HALL SENSOR DOES DHW DEMAND STOP

REMOVE DHW HALL SENSOR FROM FLOW VALVE

Next: p1437, !f1438

OBSERVATION DISCONNECT HALL SENSOR DOES DHW DEMAND STOP

REMOVE DHW HALL SENSOR FROM FLOW VALVE
REMOVE CONNECTOR FROM THE HALL SENSOR AND MAKE SAFE

Next: p1439, !f1440

RESISTANCE DHW FLOW SWITCH HARNESS

REMOVE CONNECTOR X400 FROM PCB AND CONNECTOR FROM THE HALL SENSOR ON THE FLOW SWITCH

Next: !p1441, !f1442

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p1456, !f1457

IS INTEGRAL TIMER FITTED

Next: p1458, f1459

IS VOLTAGE PRESENT FROM INTEGRAL TIMER

{SELHWCHON}
GAIN

Next: !p1462, !f1463

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p1470, f1471

VOLTAGE AT PCB MAINS

REMOVE CONTROL BOX COVER

Next: p1476, f1477

REMOVE DHW FLOW SWITCH DOES DISPLAY NOW WORK

REMOVE DHW HALL SENS

Next: p1484, !f1485

FUSE FURTHER INVESTIGATION F3

Next: !p1482, !f1483

REMOVE CONNECTOR X400 DOES DISPLAY NOW WORK

REMOVE CONNECTOR X400 FROM PCB

Next: p1486, !f1487

FAN RUNS SELF CHECK

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: p1488, ?1490, ?1492

FURTHER INVESTIGATION DISPLAY PROBLEM

Next: !p1514, !f1515

REMOVE FAN CONNECTOR DOES DISPLAY NOW WORK

REMOVE CONNECTOR X401 FROM PCB

Next: p1567, f1505

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1558, f1910

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB.

Next: !p1517, f1518

VOLTAGE DC PCB SPEED REQUEST

Next: !p1525, !f1526

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1543, !f1548

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1158, !f1547

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1552, !f1553

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1554, !f1555

VOLTAGE DC PCB SPEED REQUEST

Next: !p1556, !f1557

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1559, !f1560

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1561, !f1562

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1563, !f1564

VOLTAGE DC FAN DEMAND START-UP

Next: !p1565, !f1566

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1568, !f1569

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1570, !f1571

VOLTAGE DC FAN SPEED ON START UP

Next: !p1572, !f1573

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p1620, f1621

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: p1624, f1625

RESISTANCE IGNITER AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB.

Next: p1628, f1629

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1632, f1633

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1639, f1636

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB.

Next: p1668, f1641

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p1669, f1670

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p1676, f1673

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p1677, f1678

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p1686, f1681

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p1684, !f1685

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p1687, !f1688

INSPECTION DETECTION ELECTRODE

REMOVE DETECTION ELECTRODE FROM BURNER.

Next: !p1689, !f1690

WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p97, !f1696

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: p567, !f1743

PUMP LIMPET TEST

Next: p1752, !f1753

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p1754, !f1755

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p2035, !f1757

TEMPERATURE DIFFERENTIAL DHW

ATTACH FGA TEMPERATURE CLAMPS
ON FLOW AND RETURN PIPES AS SHOWN
DHW THERMOSTAT ON MAX

Next: !p1773, f1774

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS
NOTE: APS FITTED TOP RIGHT ON 40KW APPLIANCES

Next: !p1786, !f1787

FAULT CODES (DHW OPERATION)

Next: p1799, f2231

SYSTEM PRESSURE CHECK

Next: p1809, !f1810

PUMP LIMPET TEST

Next: p1811, !f1812

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p1855, !f1814

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS
NOTE: APS FITTED TOP RIGHT ON 40KW APPLIANCES

Next: !p1827, !f1828

RESISTANCE PUMP PCB AND HARNESS

DISCONNECT CONNECTORS X1 AND X3 FROM THE MAIN PCB

Next: p811, f1852

DIFFERENTIAL HEAT EXCHANGER ON DHW

ALLOW BOILER TO COOL

Next: !p1856, ?1857, ?1859

DIFFERENTIAL HEAT EXCHANGER ON CH

{SELHWCHON}
ATTAC

Next: !p1861, !f1862

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p202, !f203

VOLTAGE MAINS OUT PUMP PCB

SELECTOR SWITCH TO HOT WATER AND HEATING

Next: !p1921, !f1917

COMPENSATION TUBE BLOCKED OR DAMAGED

Next: p1928, !f1929

PRESSURE GAS INLET AND DROP

{SELHWCHON}
SET D

Next: p1930, ?1932, ?1934

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p2094, !f195

INSPECTION CONDENSATE TRAP

Next: p1950, !f1951

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HOT WATER AND HEATING
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1936, f1937

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p1942, f1943

VOLTAGE RECTIFICATION ON PCB

{SELHWCHON}
REMOVE THE FLAME SENSE LEAD FROM TERMINAL X501

Next: p196, !f197

INSPECTION FLUE

Next: p1946, !f1947

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p1948, !f1949

INSPECTION FLUE

Next: p1952, !f1953

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p1954, !f1955

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1956, !f1957

INSPECTION HEAT EXCHANGER

Next: p1958, !f1959

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p1960, !f1961

FLAME SENSE VOLTAGE AT PCB

{SELHWCHON}

Next: !p1028, f1024

CAN SPARKING BE SEEN

{SELHWCHON}
REMOV

Next: !p1963, f1964

RESISTANCE SPARK GENERATOR HARNESS

REMOVE CONNECTOR FROM SPARK GENERATOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1969, !f1970

VOLTAGE SPARK GENERATOR

{SELHWCHON}
GAIN

Next: p1971, !f1972

VOLTAGE SPARK GENERATOR WITH LEAD

{SELHWCHON}
GAIN

Next: !p1973, !f1974

DOES PUMP RUN

Next: p1984, f2128

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: !p1980, f1981

PUMP LIMPET TEST

Next: p1990, !f1991

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p1992, !f1993

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p1994, !f1995

TEMPERATURE DIFFERENTIAL DHW

ATTACH FGA TEMPERATURE CLAMPS
ON FLOW AND RETURN PIPES AS SHOWN
DHW THERMOSTAT ON MAX

Next: p1996, f1997

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
TURN

Next: p2008, f2009

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2006, !f2007

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p2004, !f2005

CH TEST OVERHEAT

{SELHWCHON}
TURN

Next: !p2018, ?2020, ?2022

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2016, !f2017

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p2014, !f2015

INSPECTION CONDENSATE TRAP

Next: p204, !f205

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2025, f2026

CH TEST LOCKOUT

{SELHWCHON}
TURN

Next: p2029, f2030

HW TEST LOCKOUT

SELECTOR SWITCH TO H

Next: !p2033, !f2034

TEMPERATURE DIFFERENTIAL DHW

ATTACH FGA TEMPERATURE CLAMPS
ON FLOW AND RETURN PIPES AS SHOWN
DHW THERMOSTAT ON MAX

Next: p2036, f2037

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2042, !f2043

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p206, !f207

INSPECTION HEAT EXCHANGER

Next: p2044, !f2045

INSPECTION FLUE

Next: !p2046, !f2047

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p2050, !f2051

CAN SPARKING BE SEEN (EXPLOSIVE IGN)

{SELHWCHON}
REMOV

Next: p2052, f2053

COMPENSATION TUBE BLOCKED OR DAMAGED

Next: p2056, !f2057

INSPECTION CONDENSATE TRAP

Next: p2058, !f2059

INSPECTION FLUE

Next: p2060, !f2061

INSPECTION HEAT EXCHANGER

Next: p208, !f305

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p2062, !f2063

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2064, !f2065

INSPECTION HEAT EXCHANGER

Next: p2066, !f2067

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p2068, !f2069

INSPECTION FLUE

Next: !p210, !f211

INSPECTION CONDENSATE TRAP

Next: p194, !f2102

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2121, !f2107

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2125, !f2123

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2127, !f2126

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2131, !f2132

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2133, !f2134

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2135, !f2136

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2140, !f2141

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2142, !f2143

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2144, !f2145

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2153, !f2154

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2155, !f2156

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2157, !f2158

RESISTANCE HARNESS EXTERNAL CONTROLS TO PCB

REMOVE CONNECTOR X3 FROM THE PCB

Next: p426, !f2173

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2215, f2226

INSPECTION CONDENSATE TRAP

Next: p2216, !f2217

INSPECTION APS TUBE

REMOVE TUBE FROM THE APS

Next: p2218, !f2219

INSPECTION FLUE

Next: !p2307, !f2308

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS
NOTE: APS FITTED TOP RIGHT ON 40KW APPLIANCES

Next: !p2229, !f2230

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2238, f2239

PRESSURE APS SWITCHING WITH KIT

DISCONNECT WIRES FRO

Next: p2244, !f2245

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS
NOTE: APS FITTED TOP RIGHT ON 40KW APPLIANCES

Next: !p2242, !f2243

INSPECTION CONDENSATE TRAP

Next: p2246, !f2247

INSPECTION APS TUBE

REMOVE TUBE FROM THE APS

Next: p2248, !f2249

INSPECTION FLUE

Next: p2250, !f2251

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2252, !f2253

INSPECTION HEAT EXCHANGER

Next: !p2254, !f2255

BOILER RESET

Next: p2274, f2275

INSPECTION CONDENSATE TRAP

Next: p2268, !f2269

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2264, f2265

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2270, !f2271

INSPECTION HEAT EXCHANGER

Next: !p2272, !f2273

PRESSURE APS SWITCHING WITH KIT

DISCONNECT WIRES FRO

Next: p2284, !f2285

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2278, f2279

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS
NOTE: APS FITTED TOP RIGHT ON 40KW APPLIANCES

Next: !p2282, !f2283

INSPECTION CONDENSATE TRAP

Next: p2286, !f2287

INSPECTION APS TUBE

REMOVE TUBE FROM THE APS

Next: p2288, !f2289

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2290, !f2291

INSPECTION HEAT EXCHANGER

Next: !p2292, !f2293

INSPECTION FLUE

Next: p2296, !f2297

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2298, !f2299

INSPECTION HEAT EXCHANGER

Next: !p2300, !f2301

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p301, !f302

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p1751, !f537

INSPECTION DIVERTER VALVE DHW POSITION

SELECTOR SWITCH TO HOT WATER AND HEATING
REMOVE DIVERTER VALVE MOTOR

Next: p280, f281

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p259, !f260

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p310, !f261

INSPECTION DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p286, !f287

INSPECTION HEAT EXCHANGER DHW

DRAIN BOILER PRIMARY CIRCUIT DOWN.
TURN OFF HW ISOLATION VALVE

Next: !p288, !f289

COMBUSTION READINGS

{SELHWCHON}
REMOVE COMBUSTION TESTING POINT CAP FROM BOILER

Next: p315, !f547

PUMP LIMPET TEST

Next: p1772, !f319

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p403, !f418

INSPECTION FLOW AND RETURN VALVES

Next: p389, !f390

EXPANSION VESSEL PRESSURE

BOILER DISCHARGED

Next: !p370, !f371

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p391, f555

PUMP LIMPET TEST

Next: p397, !f398

BYPASS PIPE TEMPERATURE

{SELHWCHON}
USE T

Next: p399, !f400

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p401, !f402

DIVERTER BLOCKAGE CH

ISOLATE COLD MAINS I

Next: p1736, !f406

VOLTAGE FROM SELECTOR SWITCH

{SELHWCHON}
CH THERMOSTAT TO MAX
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p424, f2170

VOLTAGE FROM EXTERNAL CONTROLS

{SELHWCHON}
CH THERMOSTAT TO MAX

Next: p2159, !f427

VOLTAGE FROM INTEGRAL TIMER

{SELHWCHON}

Next: !p428, ?429, ?433

VOLTAGE TO INTEGRAL TIMER / WIRELESS RECEIVER

{SELHWCHON}

Next: !p431, !f432

VOLTAGE LINKED CONNECTOR

{SELHWCHON}

Next: !p435, !f436

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p558, !f559

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p564, !f565

TEMPERATURE DIFFERENTIAL FLOW RETURN

{SELHWCHON}
CH TH

Next: !p568, ?569, ?571

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p611, f612

DOES PUMP RUN

Next: p643, f2137

PUMP LIMPET TEST

Next: p649, !f650

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p651, !f652

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p2024, !f654

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p797, !f795

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB.

Next: p769, f770

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p773, f774

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p777, f778

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p783, f784

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p781, !f782

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: !p787, f788

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1551, !f794

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p798, !f799

VOLTAGE DC FROM FAN

{SELHWCHON}

Next: p1524, !f804

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1838, f812

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p815, f816

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p819, f820

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p823, f824

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE MAINS WATER

Next: !p99, !f1308

System Information

Total Tests: 769

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control