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:

POTTERTON PROMAX 24 STORE & CYL ERP

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

POTTERTON PROMAX 24 STORE & CYL ERP

Next: &3, !f2

OBSERVATION DISPLAY ILLUMINATES

SELECTOR SWITCH IN CH & HW MODE

Next: &5, ?8, ?10, ?12

OBSERVATION BOILER STANDBY

ENSURE NO DEMANDS
SELECTOR SWITCH IN CH & HW MODE

Next: &82, ?51, ?53, ?160

FUSE INVESTIGATION

OK TO BE BLANK

Next: &nff, f875

TYPE OF DIAGNOSTIC PROCEDURE

Next: &84, !f83

OBSERVATION FAN RUNS

Next: &141, f92

OBSERVATION PUMP RUNS

Next: &151, f142

OBSERVATION BURNER IGNITION

Next: &393, ?152, ?154, ?156, ?158

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

ENSURE NO DHW DEMAND

Next: &409, f394

OPERATION CH

SELECTOR SWITCH IN CH & HW MODE

Next: &515, ?410, ?412, ?414, ?522, ?544, ?578

OPERATION DHW

Next: &nff, ?516, ?518, ?584, ?614

E20 - FLOW SENSOR SHORT OR OPEN

OK TO BE BLANK

Next: &nff, f651

E28 - FLUE SENSOR SHORT OR OPEN

OK TO BE BLANK

Next: &nff, f777

E110 - SAFETY THERMOSTAT OPERATED

OK TO BE BLANK

Next: &nff, f808

E160 - FAN FAULT

OK TO BE BLANK

Next: &nff, f709

E50 - HOT WATER NTC FAULT

OK TO BE BLANK

Next: &nff, f727

E119 - WATER PRESSURE SWITCH NOT OPERATED

OK TO BE BLANK

Next: &nff, f911

E125 - PUMP FAULT | CIRCULATION FAULT | TANK THERMISTOR NOT IN TANK

OK TO BE BLANK

Next: &nff, f935

E130 - FLUE NTC OPERATED (DUMMY - SEE E28)

Next: &nff, !f924

E131 - INTERRUPTION OF POWER SUPPLY WHILE IN FAULT MODE

OK TO BE BLANK

Next: &nff, f926

E193 - PRE-CIRCULATION FAULT (DUMMY - SEE E125)

OK TO BE BLANK

Next: &nff, !f934

E133 - INTERRUPTION OF GAS SUPPLY OR FLAME FAILURE (DUMMY - SEE OBSERVATION BURNER IGNITION)

OK TO BE BLANK

Next: &nff, !f1012

E168 FAULT CODE

E168 FAULT CODE
T

Next: &nff, f1129

E161 - FAN FAULT (DUMMY - SEE E160)

OK TO BE BLANK

Next: &nff, !f1295

SF OR P CALIBRATION FUNCTION

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f1310

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f1314

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1316

HEADER FOR QADAI FLOW THERMISTOR

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1318

HEADER FOR QADAI FLUE THERMISTOR

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1322

HEADER FOR QADAI DHW SENSOR

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1326

HEADER FOR QADAI GAS VALVE RESISTANCE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1330

HEADER FOR QADAI GAS VALVE VOLTAGE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1334

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1338

HEADER FOR QADAI PUMP RESISTANCE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1342

HEADER FOR QADAI PUMP VOLTAGE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1346

HEADER FOR QADAI FAN AC RESISTANCE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1350

HEADER FOR QADAI FAN AC VOLTAGE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1354

HEADER FOR QADAI DIVERTER VALVE RESISTANCE

HEADER FOR QADAI DHW SENSOR - INTENTIONALLY BLANK

Next: &nff, f1358

FAULT E125 - FAST REOCCUR - RUNNING SLOW

PUMP - 6M - ERP

Next: End

FAULT E133

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMIANTES

FUSE 2A 250V

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FAULT

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FAULT

CABLE - POWER SUPPLY

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FAULT

WIRING - CONNECTOR / SELECTOR SWITCH

Next: End

OBSERVATION FAN RUNS - OPEN ON DHW FROM PROGRAMMER

HARNESS - WIRING (X400)

Next: End

FAULT E28 - HAS APS

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E20 - SELECTOR SWITCH

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E28 - NO APS

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E50

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E110

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E119

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E125

HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION FAN RUNS

SENSOR - DHW

Next: End

FAULT E131

HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

BURNER

Next: End

FAULT E160 - FAN RUNS - OPEN TO FAN

HARNESS - WIRING (X401)

Next: End

FAULT E160 - NO MAINS TO FAN

PCB

Next: End

FAULT E160 - OPEN TO FAN

HARNESS - WIRING (X2)

Next: End

FAULT E160 - NO LOW VOLTAGE TO FAN

PCB

Next: End

FAULT E160 - HIGH SPEED

HARNESS - WIRING (X401)

Next: End

FAULT E160 - HIGH SPEED - NO LV TO FAN

PCB

Next: End

FAULT E160 - HIGH SPEED - SPEED CONTROL

FAN

Next: End

FAULT E160 - HIGH SPEED - HALL SENSOR

FAN

Next: End

OPERATION DHW - OPEN TO DV

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168

PUMP - 6M - ERP

Next: End

FAULT E168

GAS VALVE

Next: End

FAULT E168

VALVE/ACTUATOR HEAD

Next: End

FAULT E168

SPARK GENERATOR

Next: End

FAULT E168

SENSOR NTC

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

THERMOSTAT - OVERHEAT

Next: End

FAULT E168

SENSOR - DHW

Next: End

FAULT E168

KIT - ELECTRODE - IGNITION

Next: End

E168

ELECTRODE - IONIZATION

Next: End

OPERATION CH - OPEN TO DV

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168 - OPEN ON APS/FTH NO APS

HARNESS - WIRING (X401)

Next: End

FAULT E168OBSERVATION FAN RUNS

KIT - PRESSURE SWITCH

Next: End

FAULT E168 - OPEN ON APS/FTH HAS APS

HARNESS - WIRING (X401)

Next: End

FAULT E168 - FAN

HARNESS - WIRING (X401)

Next: End

FAULT E168

SYSTEM PRESSURE

Next: End

FAULT E168

SWITCH - PRESSURE - HEATING (BLOCKAGE)

Next: End

OPERATION DHW - TOO COOL

KNOB - CONTROL - WHITE

Next: End

OPERATION DHW - TOO COOL

DRIVE PIN - POTENTIOMETER

Next: End

OPERATION DHW - TOO HOT

DRIVE PIN - POTENTIOMETER

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

KNOB - CONTROL - WHITE

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

DRIVE PIN - POTENTIOMETER

Next: End

OBSERVATION FAN RUNS - NO MAINS TO FAN

PCB

Next: End

OBSERVATION FAN RUNS - OPEN TO FAN

HARNESS - WIRING (X2)

Next: End

OBSERVATION FAN RUNS

SYSTEM PRESSURE

Next: End

OBSERVATION FAN RUNS

SWITCH - PRESSURE - HEATING (BLOCKAGE)

Next: End

OBSERVATION FAN RUNS

SENSOR NTC

Next: End

OBSERVATION FAN RUNS

THERMOSTAT - OVERHEAT

Next: End

OBSERVATION FAN RUNS - OPEN ON APS/FTH NO APS

HARNESS - WIRING (X401)

Next: End

OBSERVATION FAN RUNS

KIT - PRESSURE SWITCH

Next: End

OBSERVATION FAN RUNS - OPEN ON APS/FTH HAS APS

HARNESS - WIRING (X401)

Next: End

OBSERVATION FAN RUNS - NO LOW VOLTAGE TO FAN

PCB

Next: End

OBSERVATION FAN RUNS

KNOB - CONTROL - WHITE

Next: End

OBSERVATION FAN RUNS

DRIVE PIN - POTENTIOMETER

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E110 - OPEN TO PUMP

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E125 - FAST REOCCUR - OPEN TO PUMP

HARNESS - WIRING (X1 / X3)

Next: End

FUSE INVESTIGATION

HARNESS - WIRING (X2)

Next: End

E168

HARNESS - WIRING (X2)

Next: End

FAULT E161

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION IGNITION LEAD NO SPARKING

LEAD - IGNITION ELECTRODE

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING - OPEN TO IGNITOR

HARNESS - WIRING (X2)

Next: End

NO POWER TO SPARK GENERATOR

PCB

Next: End

NO POWER TO SPARK GENERATOR WITH LEAD

PCB

Next: End

STUCK IN CALIBRATION MODE

PCB

Next: End

BLANK FOR QADAI

Z REDIRECT

Next: End

BLANK FOR LITE DIAGNOSTIC

Z REDIRECT

Next: End

QADAI

SENSOR NTC

Next: End

QADAI

DEVICE - SAFETY - FLUE

Next: End

QADAI

SENSOR - DHW

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO VOLTAGE TO GAS VALVE

PCB

Next: End

QADAI

SPARK GENERATOR

Next: End

QADAI

PUMP - 6M - ERP

Next: End

QADAI

RELAY - PCB

Next: End

QADAI

FAN

Next: End

QADAI NO POWER TO FAN AC

PCB

Next: End

QADAI

VALVE/ACTUATOR HEAD

Next: End

OBSERVATION FAN RUNS - NO DHW

PROGRAMMER

Next: End

OBSERVATION PUMP RUNS

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB

HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION BOILER STANDBY - OPEN TO FAN

HARNESS - WIRING (X401)

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

CONDENSATE TRAP ASSEMBLY

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

GAS SUPPLY

Next: End

INFORMATION CASE OFF

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

CONDENSATE TRAP ASSEMBLY

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE 2A 250V

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

COMPENSATION TUBE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

CONDENSATE TRAP ASSEMBLY

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

HEAT EXCHANGER ASSEMBLY

Next: End

BAFFLES OUT

BURNER

Next: End

OBSERVATION BURNER IGNITION - BAFFLES - FLUEWAYS

FLUE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES OUT

GAS SUPPLY

Next: End

OBSERVATION BURNER IGNITION - BAFFLES - AIR IN

FLUE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

COMPENSATION TUBE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

INJECTOR

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - DAMAGED

ELECTRODE - IONIZATION

Next: End

OBSERVATION DISPLAY ILLUMINATES

MAINS FUSE

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - NO RECT VOLTAGE

PCB

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - RESTRICTED

INJECTOR

Next: End

OBSERVATION DISPLAY ILLUMINATES - NO OUTPUT

RELAY - PCB

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

PCB AND GAS VALVE

Next: End

OBSERVATION BURNER IGNITION - DOES NOT LIGHT - SOLENOID DAMAGED

GAS VALVE

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - BLOCKED

INJECTOR

Next: End

DOES NOT LIGHT

BURNER

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

HEAT EXCHANGER ASSEMBLY

Next: End

OBSERVATION BURNER IGNITION - NOT LIGHTING

KIT - ELECTRODE - IGNITION

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - AIR IN

FLUE

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

HARNESS - WIRING - PROGRAMMER

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND - STUCK IN DHW

SWITCH - SELECTOR - 4 POSITION

Next: End

OPERATION CH INSUFFICIENT HEAT

GAS SUPPLY

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

SYSTEM PRESSURE

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

PUMP - 6M - ERP

Next: End

OBSERVATION DISPLAY ILLUMINATES

KNOB - CONTROL - WHITE

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

SYSTEM PRESSURE

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

PUMP - 6M - ERP

Next: End

OPERATION CH - INSUFFICIENT HEAT

SENSOR NTC

Next: End

OPERATION CH - INSUFFICIENT HEAT

INJECTOR

Next: End

OPERATION CH - INSUFFICIENT HEAT

BURNER

Next: End

OPERATION CH - INSUFFICIENT HEAT

HEAT EXCHANGER ASSEMBLY

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS - WIRING - PROGRAMMER

Next: End

OPERATION CH - INSUFFICIENT HEAT

FLUE

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND - NO POWER TO SWL PROGRAMMER

PCB

Next: End

OPERATION DHW

EXPANSION VESSEL - DHW

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

PCB

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

3-WAY VALVE ASSEMBLY C/W ACTUATOR HEAD

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

KIT - BY-PASS ASSEMBLY

Next: End

OPERATION CH - FAULT CODE

THERMOSTAT - OVERHEAT

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

SENSOR NTC

Next: End

OPERATION CH - FAULT CODE

SYSTEM PRESSURE

Next: End

OPERATION CH - FAULT CODE

PUMP - 6M - ERP

Next: End

OPERATION CH - FAULT CODE

SENSOR NTC

Next: End

OBSERVATION BOILER STANDBY - FAULT CODES 2

Z REDIRECT

Next: End

OPERATION CH - NOISY OR KETTLES

PUMP - 6M - ERP

Next: End

OPERATION CH - NOISY

SYSTEM PRESSURE

Next: End

OPERATION CH

EXPANSION VESSEL - CH

Next: End

OPERATION DHW - TOO HOT

SENSOR - DHW

Next: End

OPERATION DHW - TOO HOT

KNOB - CONTROL - WHITE

Next: End

OPERATION DHW - RADIATORS HEAT

PCB

Next: End

OPERATION DHW - TOO COOL

SENSOR - DHW

Next: End

OPERATION DHW - TOO HOT

PCB

Next: End

OPERATION DHW - TOO COOL

EXTERNAL MIXING

Next: End

OBSERVATION BOILER STANDBY - NO LV TO FAN

PCB

Next: End

OBSERVATION BOILER STANDBY - SPEED CONTROL

FAN

Next: End

OBSERVATION BOILER STANDBY - HALL SENSOR

FAN

Next: End

OBSERVATION BOILER STANDBY

SENSOR NTC

Next: End

FAULT E20

SENSOR NTC

Next: End

FAULT E50

SENSOR - DHW

Next: End

OPERATION CH - FAULT CODE

DEVICE - SAFETY - FLUE

Next: End

OPERATION CH - FAULT CODE - NO APS

PCB

Next: End

OPERATION CH - FAULT CODE

KIT - PRESSURE SWITCH

Next: End

OPERATION CH - FAULT CODE

HEAT EXCHANGER ASSEMBLY

Next: End

OBSERVATION BOILER STANDBY - SHORT ON DHW FROM PROGRAMMER

HARNESS - WIRING (X400)

Next: End

FAULT E28 - OPEN ON APS/FTH NO APS

HARNESS - WIRING (X401)

Next: End

FAULT E28 - NO APS

KIT - PRESSURE SWITCH

Next: End

OBSERVATION BOILER STANDBY - DHW STUCK ON

PROGRAMMER

Next: End

FAULT E28 - OPEN ON APS/FTH HAS APS

HARNESS - WIRING (X401)

Next: End

OBSERVATION BOILER STANDBY - CH STUCK ON

PROGRAMMER

Next: End

FAULT E110 - OPEN CIRCUIT

THERMOSTAT - OVERHEAT

Next: End

FAULT E110

SYSTEM PRESSURE

Next: End

FAULT E110

SENSOR NTC

Next: End

FAULT E110 - NO POWER TO PUMP

PCB

Next: End

FAULT E110 - OPEN TO PUMP PCB

HARNESS - WIRING (X1 / X3)

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

FAULT E110 - RUNNING SLOW

PUMP - 6M - ERP

Next: End

FAULT E110

HEAT EXCHANGER ASSEMBLY

Next: End

FAULT E110

Next: End

FUSE INVESTIGATION

PROGRAMMER

Next: End

FUSE INVESTIGATION

PUMP - 6M - ERP

Next: End

FUSE INVESTIGATION

RELAY - PCB

Next: End

FUSE INVESTIGATION

GAS VALVE

Next: End

FUSE INVESTIGATION

SPARK GENERATOR

Next: End

FUSE INVESTIGATION

VALVE/ACTUATOR HEAD

Next: End

FAULT E119

SYSTEM PRESSURE

Next: End

FAULT E119

SWITCH - PRESSURE - HEATING (BLOCKAGE)

Next: End

FAULT E130

Z REDIRECT

Next: End

FAULT E193

Z REDIRECT

Next: End

FAULT E125

SENSOR - DHW (POSITIONING)

Next: End

FAULT E125

SENSOR - DHW

Next: End

FAULT E125 - SLOW FAULT

PUMP - 6M - ERP

Next: End

FAULT E125 - SLOW FAULT REOCCURS

PCB

Next: End

FAULT E125 - FAST REOCCUR - NO POWER TO PUMP

PCB

Next: End

FAULT E125 - FAST REOCCUR - OPEN TO PUMP PCB

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E125

SENSOR NTC

Next: End

FAULT E125

HEAT EXCHANGER ASSEMBLY

Next: End

FAULT E28 - HAS APS

KIT - PRESSURE SWITCH

Next: End

FAULT E28 - HAS APS

HEAT EXCHANGER ASSEMBLY

Next: End

FAULT E125 - FAST REOCCUR

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FUSE

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FAULT

HARNESS - WIRING - PROGRAMMER

Next: End

OBSERVATION DISPLAY ILLUMINATES - NEUTRAL FAULT

RELAY - PCB

Next: End

FAULT E20

PCB

Next: End

FAULT E20

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E28 - HAS APS

PCB

Next: End

FAULT E28 - HAS APS

SWITCH - SELECTOR - 4 POSITION

Next: End

OBSERVATION FAN RUNS - IGNORING DEMAND

PCB

Next: End

FAULT E28 - NO APS

PCB

Next: End

FAULT E28 - NO APS

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E50

PCB

Next: End

FAULT E50

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E110

PCB

Next: End

FAULT E110

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E119

Z REDIRECT

Next: End

FAULT E119

PCB

Next: End

OBSERVATION FAN RUNS - OPEN TO DHW SENSOR

HARNESS - WIRING (X400)

Next: End

FAULT E119

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E125

PCB

Next: End

FAULT E125

SWITCH - SELECTOR - 4 POSITION

Next: End

FAULT E131

PCB

Next: End

FAULT E131

SWITCH - SELECTOR - 4 POSITION

Next: End

OBSERVATION BURNER IGNITION - ESTABLISH

HEAT EXCHANGER ASSEMBLY

Next: End

FAULT E160 - FAN RUNS - IGNORING FAN HALL SENSOR

PCB

Next: End

FAULT E160 - FAN RUNS

FAN

Next: End

FAULT E160 - NOT RUNNING

FAN

Next: End

OBSERVATION DISPLAY ILLUMINATES - FAULTY DISPLAY

PCB

Next: End

FAULT E160 - IGNORING DEMAND

FAN

Next: End

FAULT E160 - HIGH SPEED - NEUTRAL BREAK

PCB

Next: End

OPERATION DHW - RADIATORS HEAT

VALVE/ACTUATOR HEAD

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

VALVE/ACTUATOR HEAD

Next: End

FAULT E168 - PUMP

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168 - GAS VALVE

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168 - DIVERTER

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168 - OVERHEAT

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E168

HARNESS - WIRING (X400)

Next: End

FAULT E168

PCB

Next: End

FAULT E168 - SPARK GENERATOR

HARNESS - WIRING (X1 / X3)

Next: End

E168 DC

FAN

Next: End

FAULT E168 - FLOW THERMISTOR

HARNESS - WIRING (X401)

Next: End

FAULT E168 - NO APS

DEVICE - SAFETY - FLUE

Next: End

FAULT E168 - HAS APS

DEVICE - SAFETY - FLUE

Next: End

FAULT E168 - OPEN ON LWPS

HARNESS - WIRING (X400)

Next: End

FAULT E168 - NOT BLOCKED

SWITCH - PRESSURE - HEATING

Next: End

OPERATION DHW - TOO COOL

PCB

Next: End

OBSERVATION FAN RUNS - NOT RUNNING

FAN

Next: End

OBSERVATION FAN RUNS - OPEN ON LWPS

HARNESS - WIRING (X400)

Next: End

OBSERVATION FAN RUNS - NOT BLOCKED

SWITCH - PRESSURE - HEATING

Next: End

OBSERVATION FAN RUNS - OPEN TO FLOW THERMISTOR

HARNESS - WIRING (X401)

Next: End

OBSERVATION FAN RUNS - OPEN TO OVERHEAT

HARNESS - WIRING (X401)

Next: End

OBSERVATION FAN RUNS - NO APS

DEVICE - SAFETY - FLUE

Next: End

OBSERVATION FAN RUNS - HAS APS

DEVICE - SAFETY - FLUE

Next: End

OBSERVATION FAN RUNS - IGNORING DEMAND

FAN

Next: End

OBSERVATION FAN RUNS - WONT ENTER SERVICE MODE

PCB

Next: End

OBSERVATION PUMP RUNS

RELAY - PCB

Next: End

FAULT E110 - NOT RUNNING

PUMP - 6M - ERP

Next: End

FAULT E110

RELAY - PCB

Next: End

FAULT E125 - FAST REOCCUR - NOT RUNNING

PUMP - 6M - ERP

Next: End

FAULT E125 - FAST REOCCUR

RELAY - PCB

Next: End

FUSE INVESTIGATION

FAN

Next: End

E168 AC

FAN

Next: End

POOR OR NO SPARK

KIT - ELECTRODE - IGNITION

Next: End

RESISTANCE

SPARK GENERATOR

Next: End

OBSERVATION BURNER IGNITION NO SPARKING

SPARK GENERATOR

Next: End

NORMAL OPERATION

CALIBRATION FUNCTION

Next: End

FLOW THERMISTOR

RESULT AS EXPECTED

Next: End

FLUE THERMISTOR

RESULT AS EXPECTED

Next: End

DHW SENSOR

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

FAN AC RESISTANCE

RESULT AS EXPECTED

Next: End

PCB POWER TO FAN

RESULT AS EXPECTED

Next: End

DIVERTER VALVE

RESULT AS EXPECTED

Next: End

OBSERVATION PUMP RUNS

PUMP - 6M - ERP

Next: End

OBSERVATION DISPLAY ILLUMINATES - ALL OFF

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES - INTERNAL FUSE

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES

Next: End

OBSERVATION DISPLAY ILLUMINATES - MAINS FUSE

Z REDIRECT

Next: End

BAFFLES OUT LOW PRESSURE

FAN

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

GAS VALVE

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - IGNORING RECTIFICATION

PCB

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - SHORTING TO EARTH

ELECTRODE - IONIZATION

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - PRESSURE LOW

FAN

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

GAS SUPPLY

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - NO SUPPLY TO GAS VALVE

PCB

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION

PCB AND HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - GAS VALVE

HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - NOT OPENING

GAS VALVE

Next: End

OBSERVATION DISPLAY ILLUMINATES

CABLE - POWER SUPPLY

Next: End

OBSERVATION BURNER IGNITION - NO IGNITION - NOT OPENING FULLY

GAS VALVE

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND - IGNORING DEMAND

PCB

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

PROGRAMMER

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND - OPEN TER TO X3

HARNESS - WIRING (X1 / X3)

Next: End

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

WIRING - CONNECTOR / SELECTOR SWITCH

Next: End

OBSERVATION DISPLAY ILLUMINATES

WIRING - CONNECTOR / SELECTOR SWITCH

Next: End

OBSERVATION DISPLAY ILLUMINATES - STUCK IN OFF

SWITCH - SELECTOR - 4 POSITION

Next: End

OPERATION CH - UP TO TEMP RADS DO NOT HEAT

Next: End

OPERATION CH - INSUFFICIENT HEAT

FAN

Next: End

OBSERVATION DISPLAY ILLUMINATES

PROGRAMMER

Next: End

OBSERVATION DISPLAY ILLUMINATES - NO POWER TO PROGRAMMER

PCB

Next: End

OPERATION CH - INSUFFICIENT HEAT

PCB

Next: End

OPERATION DHW

TPRV 1/2 X 15

Next: End

OPERATION CH - NOISY

Next: End

OBSERVATION BOILER STANDBY - FAULT CODES 1

Z REDIRECT

Next: End

OPERATION CH - FAULT CODE - OVERHEAT

PCB

Next: End

OPERATION CH - SHUTS DOWN BEFORE TEMP

PCB

Next: End

OPERATION CH - NOISY OR KETTLES

HEAT EXCHANGER ASSEMBLY

Next: End

OPERATION CH

FLEXIBLE HOSE - EXPANSION VESSEL

Next: End

OPERATION DHW - RADIATORS HEAT

3-WAY VALVE ASSEMBLY C/W ACTUATOR HEAD

Next: End

OPERATION DHW - TOO HOT

3-WAY VALVE ASSEMBLY C/W ACTUATOR HEAD

Next: End

OBSERVATION BOILER STANDBY

FROST PROTECTION

Next: End

OBSERVATION BOILER STANDBY - READING FLOW TEMP INCORRECT

PCB

Next: End

OBSERVATION BOILER STANDBY - NEUTRAL BREAK

PCB

Next: End

FAULT E20

HARNESS - WIRING (X401)

Next: End

FAULT E20

Z REDIRECT

Next: End

FAULT E50

HARNESS - WIRING (X400)

Next: End

FAULT E50

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND DHW

PCB

Next: End

OPERATION CH - FAULT CODE

FLUE

Next: End

FAULT E28 - NO APS

DEVICE - SAFETY - FLUE

Next: End

FAULT E28 - HAS APS

DEVICE - SAFETY - FLUE

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND CH

PCB

Next: End

FAULT E28 - NO APS

Z REDIRECT

Next: End

FAULT E28 - NO APS

HEAT EXCHANGER ASSEMBLY

Next: End

E110 E111

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E110

NO FAULT OVERHEAT

Next: End

FAULT E110 - TRIPPING EARLY

THERMOSTAT - OVERHEAT

Next: End

FAULT E110 - KEEPS FIRING

PCB

Next: End

FUSE FURTHER INVESTIGATION SHORT

Next: End

FUSE INVESTIGATION - DIVERTER

HARNESS - WIRING (X1 / X3)

Next: End

FUSE INVESTIGATION - CLOCK

PCB

Next: End

FUSE INVESTIGATION - CLOCK

HARNESS - WIRING - PROGRAMMER

Next: End

FUSE INVESTIGATION - PUMP

HARNESS - WIRING (X1 / X3)

Next: End

FUSE INVESTIGATION

CABLE - POWER SUPPLY

Next: End

FUSE INVESTIGATION - GAS VALVE

HARNESS - WIRING (X1 / X3)

Next: End

FUSE INVESTIGATION - NO FAULT FOUND

NO FAULT

Next: End

FUSE INVESTIGATION - SPARK GENERATOR

HARNESS - WIRING (X1 / X3)

Next: End

FAULT E119 - OPEN ON LWPS

HARNESS - WIRING (X400)

Next: End

FAULT E119 - NOT BLOCKED

SWITCH - PRESSURE - HEATING

Next: End

FAULT E131

Z REDIRECT

Next: End

FAULT E125

NO FAULT OVERHEAT

Next: End

FAULT E28

FLUE

Next: End

PROGRAMMER ILLUMINATES / SHOWS INFORMATION BUT BOILER DISPLAY DOES NOT

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p1013

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS (E160)

Next: p1093

FAN RUNS CONTINUALLY AT HIGH SPEED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1113

NEITHER BOILER DISPLAY OR PROGRAMMER ILLUMINATES / SHOWS INFORMATION

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p14

BOILER WILL NOT ENTER SERVICE MODE

CHARACTERISTIC TEST FROM OBSERVATION DOES FAN RUN IN SERVICE MODE

Next: p1228

FAN STILL DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION DOES FAN RUN IN SERVICE MODE

Next: p1231

BURNER IGNITES AND ESTABLISHES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p291

SPARKING PRESENT BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p206

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p182

NO SPARKING PRESENT

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p1296

FAN RUNS CONTINUALLY AT HIGH SPEED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p161

PERMANENT VOLTAGE ABSENT

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION AND DROP

Next: p359

PERMANENT VOLTAGE PRESENT BUT DOES NOT DROP

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION AND DROP

Next: p355

INLET PRESSURE DOES NOT REMAIN ABOVE MINIMUM

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p370

INLET PRESSURE STAYS ABOVE MINIMUM BUT DROP NOT OBSERVED

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p372

BOILER REACHES TEMPERATURE, RADIATORS DO NOT HEAT OR ONLY GET WARM

CHARACTERISTIC TEST FROM OPERATION CH

Next: p528

BOILER SHUTS DOWN BEFORE REACHING TEMPERATURE, NO FAULT CODE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p413

BOILER REMAINS LIT BUT BOILER AND RADIATORS ONLY GET WARM

CHARACTERISTIC TEST FROM OPERATION CH

Next: p415

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p52

RADIATORS HEAT ON DHW DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p590

WATER HEATS OK BUT PRV ON CYLINDER DRIPS

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p519

BOILER NOISY OR KETTLES

CHARACTERISTIC TEST FROM OPERATION CH

Next: p523

FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p54

FAULT CODE OCCURS DURING OPERATION

CHARACTERISTIC TEST FROM OPERATION CH

Next: p545

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p579

WATER FROM TAP TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p585

ROOM TEMPERATURE IS ABOVE 5°C BUT DISPLAY TEMPERATURE AT OR BELOW 5°C

CHARACTERISTIC TEST FROM OBSERVATION BOILER DISPLAY TEMPERATURE

Next: p61

WATER FROM TAP TOO COLD, RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p620

ROOM TEMPERATURE AT OR BELOW 5°C

CHARACTERISTIC TEST FROM OBSERVATION BOILER DISPLAY TEMPERATURE

Next: !p63

BOILER DISPLAY ILLUMINATES / SHOWS INFORMATION BUT PROGRAMMER DOES NOT

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p9

BOILER WILL NOT RESET OR RESETS AND RETURNS TO FAULT CODE

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET (E28) - NO APS

Next: p1050

BOILER RESETS BUT REOCCURS DURING OPERATION

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET (E28) - NO APS

Next: !p807

BOILER GOES TO OVERHEAT - TEMPERATURE BELOW 82°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

Next: !p838

BOILER FLOW TEMPERATURE EXCEEDS 88°C AND BOILER STILL FIRED

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

Next: !p840

SHORT CIRCUIT / LOW RESISTANCE MEASURED ON TEST 1

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: !p878

SHORT CIRCUIT / LOW RESISTANCE MEASURED ON TEST 2

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: p880

FAULT CODE REOCCURS WITHIN 30 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET E125

Next: p971

FAULT CODE DOES NOT REOCCUR WITHIN 30 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET E125

Next: p950

15/07/2022 14:47:40 2207_1_50_1 20/10/2022 11:17:29

07/09/2022 13:47:39

Next: End

RESISTANCE FUSE NEUTRAL

REMOVE NEUTRAL FUSE FROM ITS HOLDER (IN LINE WITH BLUE WIRE)

Next: p1021, f1018

FUSE FURTHER INVESTIGATION

Next: !p1019, !f1020

RESISTANCE NEUTRAL CONTINUITY TO X2

Next: p1034, !f1035

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1039, f1040

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1041, !f1049

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1044, f1045

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1046, !f1048

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1053, !f1054

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1056, f1057

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1058, !f1059

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: !p107, !f108

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1061, f1062

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1063, !f1064

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1068, f1069

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1070, !f1071

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1076, !f1077

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1079, f1080

RESISTANCE HARNESS SELECTOR SWITCH TO PCB (RESET)

Next: !p1081, !f1082

RESISTANCE HARNESS FAN (LV)

{GAINPCBACS}
DISCONNECT 4 WIRE PLUG FROM THE FAN
DISCONNECT CONNECTOR X401 FROM THE PCB

Next: !p1090, !f1091

VOLTAGE PCB TO FAN (HV)

{GAINPCBACS}

Next: p1096, !f1097

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1130, f1131

RESISTANCE PUMP

DISCONNECT PLUG FROM PUMP

Next: !p1132, !f1133

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p1136, !f1137

RESISTANCE DIVERTER VALVE

DISCONNECT PLUG FROM DIVERTER VALVE
UNCLIP AND REMOVE DIVERTER VALVE

Next: !p1140, !f1141

RESISTANCE SPARK GENERATOR

DISCONNECT PLUG ON THE SPARK GENERATOR

Next: !p1181, !f1145

RESISTANCE HARNESS FAN (FUSE INV)

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT 3 PIN PLUG FROM THE FAN

Next: !p1293, !f1294

RESISTANCE HARNESS FAN (LV)

{GAINPCBACS}
DISCONNECT 4 WIRE PLUG FROM THE FAN
DISCONNECT CONNECTOR X401 FROM THE PCB

Next: !p1183, !f1195

RESISTANCE FLOW THERMISTOR

DISCONNECT PLUG FROM THE FLOW THERMISTOR

Next: !p1185, !f1157

RESISTANCE OVERHEAT STAT

DISCONNECT PLUG FROM OVERHEAT THERMOSTAT
(BELOW HEAT EXCHANGER, WITHIN INNER COMBUSTION CHAMBER)

Next: !p1164, !f1165

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: !p1168, !f1169

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p1187, f1188

RESISTANCE HARNESS FLUE THERMISTOR (NO APS)

DISCONNECT PLUG FROM

Next: !p1189, !f1190

INSPECTION PRESSURE SYSTEM

Next: p1197, !f1198

INSPECTION WATER PRESSURE SWITCH

DRAIN PRIMARY SYSTEM OF WATER

Next: !p1201, !f1202

VOLTAGE PCB TO FAN (HV)

{GAINPCBACS}

Next: p1234, !f1235

INSPECTION PRESSURE SYSTEM

Next: p1240, !f1241

INSPECTION WATER PRESSURE SWITCH

DRAIN PRIMARY SYSTEM OF WATER

Next: !p1244, !f1245

RESISTANCE FLOW THERMISTOR

DISCONNECT PLUG FROM THE FLOW THERMISTOR

Next: !p1248, !f1249

RESISTANCE OVERHEAT STAT

DISCONNECT PLUG FROM OVERHEAT THERMOSTAT
(BELOW HEAT EXCHANGER, WITHIN INNER COMBUSTION CHAMBER)

Next: !p1252, !f1253

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p1256, f1257

RESISTANCE HARNESS FLUE THERMISTOR (NO APS)

DISCONNECT PLUG FROM

Next: !p1258, !f1259

RESISTANCE SPARK GENERATOR AND LEADS

REMOVE SPARK LEAD AND EARTH WIRE FROM ELECTRODE

Next: p1299, f1300

RESISTANCE IGNITION LEAD

DISCONNECT IGNITION AND EARTH LEADS FROM THE SPARK GENERATOR

Next: !p1301, !f1302

OBSERVATION CAN CALIBRATION FUNCTION BE DISABLED

Next: !p1311, !f1312

RESISTANCE FLOW THERMISTOR

DISCONNECT PLUG FROM THE FLOW THERMISTOR

Next: !p1319, !f1320

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: !p1323, !f1324

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: !p1327, !f1328

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p1331, !f1332

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p1335, !f1336

RESISTANCE SPARK GENERATOR

DISCONNECT PLUG ON THE SPARK GENERATOR

Next: !p1339, !f1340

RESISTANCE PUMP

DISCONNECT PLUG FROM PUMP

Next: !p1343, !f1344

VOLTAGE PUMP AT PUMP

{GAINPCBACS}
DISC

Next: !p1347, !f1348

RESISTANCE FAN AND HARNESS (HV)

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p1351, !f1352

VOLTAGE PCB TO FAN (HV)

{GAINPCBACS}

Next: !p1355, !f1356

RESISTANCE DIVERTER VALVE

DISCONNECT PLUG FROM DIVERTER VALVE
UNCLIP AND REMOVE DIVERTER VALVE

Next: !p1359, !f1360

VOLTAGE PUMP AT PUMP

{GAINPCBACS}
DISC

Next: !p143, f146

VOLTAGE CONTROL PCB TO PUMP PCB

Next: p147, !f148

VOLTAGE MAINS INPUT TERMINAL OUT

SELECTOR SWITCH SET TO HEATING & HOT WATER

Next: p17, f18

VOLTAGE MAINS INPUT TERMINAL IN

&NBSP

Next: p19, f21

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p24, f25

FUSE FURTHER INVESTIGATION

Next: !p26, !f36

INSPECTION MAIN HEAT EXCHANGER

REMOVE FAN AND BURNER ASSEMBLY

Next: p296, !f297

INSPECTION INJECTOR

UNSCREW THE NUT CONNECTED TO THE BOILER VENTURI

Next: !p365, !f366

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE MAIN PCB

Next: !p375, f376

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p377, !f378

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p381, !f382

VOLTAGE EXTERNAL CONTROLS TO PCB

{GAINPCBACS}

Next: p395, f402

VOLTAGE CONTROL PCB TO PROG AT PCB (CH)

{GAINPCBACS}
SELECTOR SWITCH IN CH & HW MODE

Next: p398, !f507

RESISTANCE SELECTOR SWITCH MAINS

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

Next: !p41, f42

VOLTAGE INTO EXTERNAL CONTROLS

SELECTOR SWITCH IN CH & HW MODE

Next: p403, f406

RESISTANCE SELECTOR SWITCH CH

DISCONNECT THE ORANG

Next: !p407, !f408

INSPECTION SELECTOR SWITCH CONTROL KNOB

Next: !p43, !f44

INSPECTION INJECTOR

UNSCREW THE NUT CONNECTED TO THE BOILER VENTURI

Next: !p466, !f467

RESISTANCE HARNESS PROGRAMMER (X9)

{GAINPCBACS}
DISCONNECT THE 4 PIN CONNECTOR AT THE PROGRAMMER AND X9 AT THE PCB

Next: !p49, !f50

INSPECTION DIVERTER VALVE SPINDLE

REMOVE DIVERTER VALVE HEAD

Next: p537, !f542

INSPECTION PRESSURE SYSTEM

Next: p565, !f568

VOLTAGE PCB TO DIVERTER VALVE (DHW)

{GAINPCBACS}
SELECTOR SWITCH IN HW MODE

Next: p1122, !f612

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p652, f653

RESISTANCE FLOW THERMISTOR

DISCONNECT PLUG FROM THE FLOW THERMISTOR

Next: !p654, !f655

VOLTAGE PROGRAMMER TO PCB (CH) - NO DEMAND

{GAINPCBACS}

Next: !p80, !f81

OBSERVATION FAN RUNS (E160 / E161)

Next: p1087, ?1092, ?1112

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: p732, f729

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: !p730, !f731

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p764, !f765

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p778, f779

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p780, f781

RESISTANCE HARNESS FLUE THERMISTOR (NO APS)

DISCONNECT PLUG FROM

Next: !p782, !f783

RESISTANCE APS

DISCONNECT WIRES FROM APS

Next: p788, !f789

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p809, f810

RESISTANCE OVERHEAT STAT

DISCONNECT PLUG FROM OVERHEAT THERMOSTAT
(BELOW HEAT EXCHANGER, WITHIN INNER COMBUSTION CHAMBER)

Next: !p811, !f812

VOLTAGE PUMP AT PUMP

{GAINPCBACS}
DISC

Next: !p1276, f822

VOLTAGE CONTROL PCB TO PUMP PCB

Next: p823, !f824

RESISTANCE MAINS INTO BOILER

REMOVE INTERNAL FUSES FROM THE TERMINAL BLOCK

Next: p876, ?877, ?879

RESISTANCE DIVERTER VALVE

DISCONNECT PLUG FROM DIVERTER VALVE
UNCLIP AND REMOVE DIVERTER VALVE

Next: !p883, !f909

RESISTANCE HARNESS FAN (FUSE INV)

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT 3 PIN PLUG FROM THE FAN

Next: !p1290, !f1291

RESISTANCE PROGRAMMER (PERMANENT)

DISCONNECT CONNECTOR 4 PIN PLUG AT THE PROGRAMMER

Next: !p891, !f892

RESISTANCE PUMP

DISCONNECT PLUG FROM PUMP

Next: !p895, !f896

RESISTANCE PUMP PCB

DISCONNECT WIRES FROM PUMP PCB

Next: !p899, !f900

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p903, !f904

RESISTANCE SPARK GENERATOR

DISCONNECT PLUG ON THE SPARK GENERATOR

Next: !p907, !f908

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: p919, f912

INSPECTION PRESSURE SYSTEM

Next: p913, !f914

INSPECTION WATER PRESSURE SWITCH

DRAIN PRIMARY SYSTEM OF WATER

Next: !p917, !f918

OBSERVATION DOES FAN RUN IN SERVICE MODE

Next: p100, ?1227, ?1229

OBSERVATION BOILER RESET (E131)

Next: !p927, f1078

OBSERVATION BOILER RESET E125 / E193

SELECTOR SWITCH IN CH & HW MODE

Next: p1073, ?946, ?948

VOLTAGE PUMP AT PUMP

{GAINPCBACS}
DISC

Next: !p1282, f961

VOLTAGE CONTROL PCB TO PUMP PCB

Next: p962, !f963

RESISTANCE PROGRAMMER DHW DEMAND

DISCONNECT THE 2 WIRE PLUG FROM THE PROGRAMMER
USE INSULATION MAT AS REQUIRED

Next: p102, !f140

RESISTANCE NEUTRAL CONTINUITY TO PROGRAMMER

Next: !p11, f1017

RESISTANCE HARNESS PCB TO PROGRAMMER DHW

DISCONNECT 2 PIN CONNECTOR FROM THE PROGRAMMER

Next: p103, !f104

RESISTANCE NEUTRAL CONTINUITY TO X1

Next: p1030, f1033

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: !p105, f106

RESISTANCE NEUTRAL CONTINUITY TO X9

Next: !p1031, !f1032

RESISTANCE NEUTRAL CONTINUITY TO X3

Next: !p1036, !f1037

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1051, f1052

RESISTANCE SELECTOR SWITCH ON RESET AT PCB

{GAINPCBACS}

Next: !p1074, f1075

INSPECTION BURNER

REMOVE FAN AND BURNER ASSEMBLY

Next: !p1086, !f1085

VOLTAGE FAN HALL SENSOR (NO SPARKING)

{GAINPCBACS}

Next: !p1088, f1089

OBSERVATION DOES FAN RUN WITHOUT SPEED CONTROL

DISCONNECT THE 4 PIN PLUG FROM THE FAN AND MAKE SAFE

Next: p1094, f1095

VOLTAGE PCB DEMAND TO FAN (LV)

{GAINPCBACS}
SELECTOR SWITCH IN CH & HW MODE

Next: !p1100, !f1101

RESISTANCE HARNESS FAN (HV)

DISCONNECT THE 3 PIN PLUG FROM THE FAN

Next: !p1098, !f1099

RESISTANCE HARNESS FAN (LV)

{GAINPCBACS}
DISCONNECT 4 WIRE PLUG FROM THE FAN
DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1114, !f1115

VOLTAGE PCB TO FAN PERMANENT (DC)

{GAINPCBACS}

Next: p1116, !f1117

VOLTAGE FAN SPEED CONTROL

{GAINPCBACS}

Next: p1118, !f1119

VOLTAGE FAN HALL SENSOR

{GAINPCBACS}

Next: !p1120, !f1121

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT PLUG FROM DIVERTER MOTOR

Next: !p1123, !f1124

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT PLUG FROM DIVERTER MOTOR

Next: !p1126, !f1180

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE MAIN PCB

Next: p1134, f1135

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE PCB

Next: p1138, f1139

RESISTANCE SPARK GENERATOR AND HARNESS

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p1142, f1143

RESISTANCE FAN AND HARNESS (HV)

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p1146, f1147

RESISTANCE FAN AND HARNESS (LV)

{GAINPCBACS}
DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1150, f1151

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1154, f1155

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1158, f1186

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1162, f1163

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: p1166, f1167

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: p1170, f1196

INSPECTION IGNITION ELECTRODES

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p1176, !f1177

INSPECTION FLAME DETECTION ELECTRODE

REMOVE FAN AND BURNER ASSEMBLY

Next: !p1178, !f1179

RESISTANCE APS

DISCONNECT WIRES FROM APS

Next: p1191, !f1192

RESISTANCE HARNESS FLUE THERMISTOR (APS FITTED)

DISCONNECT PLUG FROM

Next: !p1193, !f1194

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE WATER PRESSURE SWITCH

Next: !p1199, f1200

INSPECTION DHW SPINDLE

Next: !p1205, !f1206

INSPECTION DHW SPINDLE

Next: p627, !f1211

INSPECTION CH SPINDLE

Next: p432, !f1226

INSPECTION CH CONTROL KNOB

Next: p1212, !f1225

INSPECTION DHW AND CH CONTROL KNOBS

Next: p1266, !f1269

OBSERVATION DOES FAN RUN WITHOUT SPEED CONTROL

DISCONNECT THE 4 PIN PLUG FROM THE FAN AND MAKE SAFE

Next: p1232, f1233

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

DISCONNECT CONNECTOR X400 FROM THE PCB

Next: p1238, f1239

RESISTANCE HARNESS FAN (HV)

DISCONNECT THE 3 PIN PLUG FROM THE FAN

Next: !p1236, !f1237

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1246, f1247

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE WATER PRESSURE SWITCH

Next: !p1242, f1243

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1250, f1251

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1254, f1255

VOLTAGE PCB DEMAND TO FAN (LV)

{GAINPCBACS}
SELECTOR SWITCH IN CH & HW MODE

Next: !p1264, !f1265

RESISTANCE APS

DISCONNECT WIRES FROM APS

Next: p1260, !f1261

RESISTANCE HARNESS FLUE THERMISTOR (APS FITTED)

DISCONNECT PLUG FROM

Next: !p1262, !f1263

INSPECTION DHW AND CH SPINDLES

Next: !p1267, !f1268

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR

Next: !p1273, !f1274

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR

Next: !p1279, !f1280

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR

Next: !p1285, !f1286

OBSERVATION SPARKING AT LEAD

DISCONNECT THE IGNITION LEAD AND WEDGE IT INTO THE RIDGE ABOVE THE COMBUSTION CHAMBER AS SHOWN

Next: !p1297, f1298

RESISTANCE HARNESS PCB TO SPARK GENERATOR

DISCONNECT PLUG FROM SPARK GENERATOR

Next: p1303, !f1304

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}
REMOVE CONNECTOR FROM SPARK GENERATOR AND MAKE SAFE

Next: p1305, !f1306

VOLTAGE SPARK GENERATOR AT PCB WITH LEAD

{GAINPCBACS}
RECONNECT PLUG TO SPARK GENERATOR IF YOU HAVE NOT ALREADY DONE SO

Next: !p1307, !f1308

VOLTAGE MAINS INTO CONTROL PCB

{GAINPCBACS}
SELECTOR SWITCH SET TO HEATING & HOT WATER

Next: !p15, f16

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1272, !f150

RESISTANCE HARNESS FAN (LV)

{GAINPCBACS}
DISCONNECT 4 WIRE PLUG FROM THE FAN
DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p634, !f173

VOLTAGE MAINS IN PUMP PCB

SELECTOR SWITCH IN CH & HW MODE

Next: p29, f40

INSPECTION CONDENSATE TRAP

Next: p183, !f184

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT

Next: p185, !f186

VOLTAGE RECTIFICATION AND DROP

{GAINPCBACS}

Next: !p350, ?345, ?347

FUSE FURTHER INVESTIGATION

Next: !p22, !f23

INSPECTION CONDENSATE TRAP

Next: p258, !f208

INSPECTION COMPENSATION TUBE

Next: p362, !f290

VOLTAGE MAINS OUT PUMP PCB

SELECTOR SWITCH SET TO HEATING & HOT WATER

Next: !p39, !f37

INSPECTION CONDENSATE TRAP

Next: p316, !f293

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 PIN

Next: p294, f295

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT

Next: p302, !f303

INSPECTION BURNER

REMOVE FAN AND BURNER ASSEMBLY

Next: p298, !f299

INSPECTION FLUE

Next: !p300, !f301

INSPECTION FLUE

Next: p341, !f305

INSPECTION COMPENSATION TUBE

Next: p292, !f340

INSPECTION INJECTOR

UNSCREW THE NUT CONNECTED TO THE BOILER VENTURI

Next: !p342, !f343

INSPECTION FLAME DETECTION ELECTRODE

REMOVE FAN AND BURNER ASSEMBLY

Next: p1083, !f357

VOLTAGE RECTIFICATION PERMANENT - WITHOUT LEAD

{GAINPCBACS}
DISCONNECT CONNECTOR AT X501 AND MAKE SAFE

Next: !p360, !f361

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 PIN

Next: p363, f364

PRESSURE GAS INLET AND DROP

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT

Next: p367, ?369, ?371

INSPECTION BURNER

REMOVE FAN AND BURNER ASSEMBLY

Next: p385, !f386

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p373, f374

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE MAIN PCB

Next: p379, f380

INSPECTION INJECTOR

UNSCREW THE NUT CONNECTED TO THE BOILER VENTURI

Next: !p383, !f384

INSPECTION MAIN HEAT EXCHANGER

REMOVE FAN AND BURNER ASSEMBLY

Next: p387, !f388

INSPECTION IGNITION ELECTRODES

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p389, !f390

INSPECTION FLUE

Next: !p391, !f392

VOLTAGE PROGRAMMER TO PCB (CH)

{GAINPCBACS}
SELECTOR SWITCH IN CH & HW MODE

Next: !p396, f397

RESISTANCE HARNESS PCB TO PROGRAMMER CH

DISCONNECT 4 PIN CONNECTOR FROM THE PROGRAMMER

Next: !p399, !f400

VOLTAGE FROM EXTERNAL CONTROLS

SELECTOR SWITCH IN CH & HW MODE

Next: !p404, !f405

INSPECTION PRESSURE SYSTEM

Next: p454, !f455

INSPECTION PRESSURE SYSTEM

Next: p1218, !f433

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT

Next: p460, !f417

PUMP LIMPET TEST

Next: p553, !f435

PUMP LIMPET TEST

Next: p456, !f457

OBSERVATION SHUT BYPASS

ENSURE NO DHW DEMAND

Next: !p458, !f543

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p463, !f461

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 PIN

Next: p494, f465

INSPECTION BURNER

REMOVE FAN AND BURNER ASSEMBLY

Next: p495, !f496

INSPECTION MAIN HEAT EXCHANGER

REMOVE FAN AND BURNER ASSEMBLY

Next: p503, !f498

INSPECTION FLUE

Next: !p506, !f505

PRESSURE SECONDARY EXPANSION VESSEL CHARGE

DHW SUPPLY TURNED OF

Next: !p520, !f521

OBSERVATION BOILER DISPLAY TEMPERATURE

Next: p59, ?60, ?62

OPERATION DHW (CH OP)

Next: !p524, f561

OBSERVATION DIVERTER VALVE POSITION (CH)

ENSURE NO DHW DEMAND
SELECTOR SWITCH IN CH & HW MODE

Next: p411, f536

VOLTAGE PCB TO DIVERTER VALVE (CH)

{GAINPCBACS}
SELECTOR SWITCH IN CH & HW MODE
ENSURE NO DHW DEMAND

Next: p1125, !f541

FAULT CODES

Next: !p55, !f56

FAULT CODES (OPERATION CH)

Next: p546, f763

INSPECTION PRESSURE SYSTEM

Next: p548, !f556

PUMP LIMPET TEST

Next: p549, !f557

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p550, !f558

OBSERVATION RUN BOILER UP TO TEMP (OPERATION CH)

ATTACH TEMPERATURE C

Next: !p551, !f552

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: !p555, !f554

PUMP LIMPET TEST

Next: !p566, !f567

PRESSURE EXPANSION VESSEL

DRAIN BOILER PRIMARY CIRCUIT

Next: !p580, !f581

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: p586, !f587

INSPECTION DHW CONTROL KNOB

Next: p1207, !f589

OBSERVATION DOES BOILER FIRE ON DHW MODE

ENSURE NO DEMANDS
TURN SELECTOR SWITCH TO DHW ONLY POSITION

Next: p66, f67

OBSERVATION DIVERTER VALVE POSITION (DHW)

Next: !p613, f610

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: !p64, !f65

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: p616, !f617

INSPECTION DHW CONTROL KNOB

Next: p1204, !f1203

TEMPERATURE DHW AT BOILER

ATTACH TEMPERATURE CLAMP TO DHW OUTLET PIPE
(RUNNING FROM THE TOP OF THE CYLINDER)

Next: p615, !f631

OBSERVATION CH PASSING TO DHW

ATTACH TEMPERATURE C

Next: !p628, !f629

VOLTAGE PCB TO FAN PERMANENT (DC)

{GAINPCBACS}

Next: p635, !f644

VOLTAGE FAN SPEED CONTROL

{GAINPCBACS}

Next: p637, !f647

VOLTAGE FAN HALL SENSOR

{GAINPCBACS}

Next: !p648, !f649

OBSERVATION BOILER RESET

Next: !p656, f1038

OBSERVATION DISCONNECT PROGRAMMER DHW

DISCONNECT THE 2 PIN PLUG FROM THE PROGRAMMER AND MAKE SAFE

Next: p76, !f79

OBSERVATION BOILER RESET

Next: !p733, f1055

INSPECTION HARNESS PCB TO PROGRAMMER DHW

DISCONNECT X400 FROM THE PCB AND THE 2 PIN CONNECTOR FROM THE PROGRAMMER

Next: !p77, !f78

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p766, !f767

PRESSURE APS SWITCHING WITH KIT

DISCONNECT WIRES FRO

Next: p768, !f769

INSPECTION MAIN HEAT EXCHANGER

REMOVE FAN AND BURNER ASSEMBLY

Next: !p770, !f771

RESISTANCE FLUE THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p786, f787

OBSERVATION BOILER RESET (E28) - NO APS

Next: !p802, ?804, ?806

OBSERVATION BOILER RESET (E28)

Next: p991, f1043

RESISTANCE HARNESS FLUE THERMISTOR (APS FITTED)

DISCONNECT PLUG FROM

Next: !p790, !f791

OBSERVATION BOILER RESET (OVERHEAT)

Next: p813, f1060

INSPECTION PRESSURE SYSTEM

Next: p815, !f816

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p817, !f818

OBSERVATION PUMP RUNS

Next: p819, f820

PUMP LIMPET TEST

Next: p829, !f830

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1278, !f826

TEMPERATURE DIFFERENTIAL PRIMARY

ATTACH TEMPERATURE C

Next: p831, !f832

TEMPERATURE DIFFERENTIAL HEATING

ATTACH TEMPERATURE C

Next: p833, !f834

OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

ATTACH TEMPERATURE C

Next: !p835, ?837, ?839

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p893, f894

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE PCB

Next: p881, f882

RESISTANCE FAN AND HARNESS (HV)

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p885, f886

RESISTANCE PROGRAMMER AND HARNESS (PERMANENT)

DISCONNECT CONNECTOR X9 FROM THE PCB

Next: !p889, f890

RESISTANCE PUMP PCB AND HARNESS

DISCONNECT CONNECTORS X1 AND X3 FROM THE MAIN PCB

Next: p897, f898

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE MAIN PCB

Next: p901, f902

VOLTAGE CONTROL PCB TO PROG AT PROG (PERMANENT)

REMOVE OUTER PANELS AND LOWER THE FRONT FACIA TO GAIN ACCESS TO THE PROGRAMMER WIRING CONNECTIONS

Next: !p47, f48

RESISTANCE SPARK GENERATOR AND HARNESS

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p905, f906

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE WATER PRESSURE SWITCH

Next: !p915, f916

OBSERVATION BOILER RESET

Next: !p1066, f1067

OBSERVATION PUMP RUNS

Next: p968, f959

INSPECTION DHW SENSOR

Next: p951, !f952

RESISTANCE DHW SENSOR

DISCONNECT THE CONNECTOR TO THE DHW SENSOR

Next: p953, !f954

PUMP LIMPET TEST

Next: p955, !f956

OBSERVATION RUN BOILER UP TO TEMP - DOES CIRCULATION FAULT REOCCUR

CH TEMPERATURE CONTROL TO MAX
SELECTOR SWITCH IN CH & HW MODE

Next: !p957, !f958

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1284, !f965

PUMP LIMPET TEST

Next: p970, !f1010

OPERATION CH (FAULT E125)

SELECTOR SWITCH IN CH & HW MODE

Next: !p1009, !f988

RESISTANCE FLOW THERMISTOR AND HARNESS

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p947, !f985

PRESSURE APS SWITCHING WITH KIT

DISCONNECT WIRES FRO

Next: p992, !f993

INSPECTION MAIN HEAT EXCHANGER

REMOVE FAN AND BURNER ASSEMBLY

Next: !p994, !f995

System Information

  • Total Tests: 695
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control