XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

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

Start Diagnostic Sequence

or choose a specific test below:

IDEAL MINI C32 HE

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

IDEAL MINI C32 HE - 4734841 - SINGLE PCB VERSION

Next: &438, !f2

OBSERVATION BOILER STANDBY

ENSURE NO DEMAND FOR

Next: &85, ?4, ?6, ?8

OBSERVATION PUMP RUNS

DHW TEMPERATURE SELECTOR SET TO MAX

Next: &84, f65

OBSERVATION FAN RUNS

DHW TEMPERATURE SELECTOR SET TO MAX

Next: &143, f94

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &87, !f86

OBSERVATION DHW FLOW RATE

Next: &64, f88

OBSERVATION BURNER IGNITION

DHW TEMPERATURE SELECTOR SET TO MAX

Next: &285, ?144, ?187, ?207, ?230

OBSERVATION BOILER RESPONDS TO CH DEMAND

Next: &366, f1151

PRESSURE BURNER MIN

ATTACH PRESSURE GAUG

Next: &257, f1309

OPERATION DHW

DHW TEMPERATURE SELECTOR SET TO MAX

Next: &1324, ?367, ?369, ?371, ?373

SEQUENCE OF OPERATION

NO LONGER USED

Next: &nff, !f428

INFORMATION PCB MODIFICATION

PLEASE NOTE THAT THE

Next: &3, !f439

FUSE FURTHER INVESTIGATION

OUTSIDE MODEL

Next: &nff, f925

FAULT CODE 202 - DHW OPERATION

OUTSIDE MODEL

Next: &nff, f581

FAULT CODE 202 - CH OPERATION

OUTSIDE MODEL

Next: &nff, f591

FAULT CODE 220 - FROST PROTECTION

OUTSIDE MODEL

Next: &nff, f618

FAULT CODE 112 - FLUE TEMPERATURE LOCKOUT

Next: &nff, f724

FAULT CODE 122 - OVERHEAT LOCKOUT

OUTSIDE MODEL

Next: &nff, f735

FAULT CODE 212 - IGNITION LOCKOUT - DUMMY FAULT CODE GOES TO BURNER IGNITION

OUTSIDE MODEL

Next: &nff, !f734

FAULT CODE 221 - APS FAULT

OUTSIDE MODEL

Next: &nff, f787

FAULT CODE 210 - PUMP PROVING FAULT

OUTSIDE MODEL

Next: &nff, f843

FAULT CODE 120 - FAULTY FLUE THERMISTOR

Next: &nff, f714

FAULT CODE 021 - FAULTY DHW THERMISTOR

OUTSIDE MODEL

Next: &nff, f706

FAULT CODE 022 - FAULTY CH THERMISTOR

OUTSIDE MODEL

Next: &nff, f685

FAULT CODE 002 - EXCESSIVE PRIMARY TEMPERATURE ON DHW OPERATION

OUTSIDE MODEL

Next: &nff, f636

FAULT CODE 111 - PCB FAULT

OUTSIDE MODEL

Next: &nff, f623

OBSERVATION DHW MODULATION

ADJUST DHW FLOW RATE

Next: &784, f894

OPERATION CH

CH TEMPERATURE CONTROL SET TO MAX

Next: &785, ?983, ?985, ?1003

OBSERVATION CH MODULATION

CH TEMPERATURE CONTR

Next: &786, f902

OBSERVATION PUMP OVERRUN

Next: &nff, !f869

FAULT CODE 020 - FALSE FLAME DETECTED

OUTSIDE MODEL

Next: &nff, f1089

PRESSURE BURNER MAXIMUM

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT
DHW TEMPERATURE SELECTOR SET TO MAX

Next: &1325, f1328

PRESSURE IGNITION

ATTACH PRESSURE GAUG

Next: &783, !f1326

FAULT CODE 222 - NEW PCB FAULT

Next: &nff, f1432

FAULT CODE 002 - NO VOLTAGE TO DIVERTER

PCB

Next: End

FAULT CODE 002

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OPERATION CH RADS DO NOT HEAT

SYSTEM PRESSURE

Next: End

OPERATION CH RADS DO NOT HEAT

TAP 3/4IN - CH

Next: End

OPERATION CH RADS DO NOT HEAT

MOTOR - PUMP

Next: End

OPERATION CH RADS DO NOT HEAT

PCB

Next: End

OPERATION CH RADS DO NOT HEAT

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OPERATION CH RADS DO NOT HEAT

SERVICE KIT - DIVERTER VALVE

Next: End

OPERATION CH RADS DO NOT HEAT

KIT - BY-PASS

Next: End

OPERATION CH - RADS COOL

KNOB

Next: End

OPERATION CH - RADS COOL

TEMPERATURE PROBE

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

CONDENSATE TRAP

Next: End

FAULT CODE 112

HEAT EXCHANGER - MAIN

Next: End

FAULT CODE 002

RECUPERATOR

Next: End

OBSERVATION FAN RUNS - FAN

CABLE - FAN

Next: End

FAULT CODE 020

WATER INGRESS

Next: End

FAULT CODE 020 - INCORRECTLY READING FAULT

PCB

Next: End

FAULT CODE 020

ELECTRODE - DETECTION

Next: End

FAULT CODE 020 - SENDING VOLTAGE TO GAS VALVE AFTER DEMAND

PCB

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT ILLUMINATE

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION FAN RUNS

MOTOR - PUMP

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - OPEN CIRCUIT TO EXT CONTROLS

CABLE - POWER SUPPLY & EXT CONTROL

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITHOUT INTEGRAL TIMER

CABLE - POWER SUPPLY & EXT CONTROL

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITHOUT INTEGRAL TIMER - NO POWER TO EXTERNAL CONTROLS

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITOUT INTEGRAL TIMER - IGNORING CH DEMAND

PCB

Next: End

OBSERVATION FAN RUNS

DIAPHRAGM - PRESSURE SWITCH - CH

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITH INTEGRAL TIMER

CABLE - TIME SWITCH

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND

KNOB

Next: End

FAULT CODE 221

TEST POINT - AIR PRESSURE SWITCH

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - NO VOLTAGE TO RECTIFICATION CIRCUIT

PCB

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - SHORTING TO EARTH

ELECTRODE - DETECTION

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

SWITCH - AIR PRESSURE

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

CABLE - FAN

Next: End

OBSERVATION FAN RUNS

KIT - MICROSWITCH

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

TUBE (AIR PRESSURE SWITCH)

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

TEST POINT - AIR PRESSURE SWITCH

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

FLUE

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

HEAT EXCHANGER - MAIN

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

RECUPERATOR

Next: End

OBSERVATION FAN RUNS - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

OBSERVATION PUMP RUNS - FLOW SWITCH

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

CONDENSATE TRAP

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

FLUE

Next: End

OBSERVATION FAN RUNS - DHW SENSOR

TEMPERATURE PROBE

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

PCB

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

HEAT EXCHANGER - MAIN

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

RECUPERATOR

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

BURNER

Next: End

PRESSURE BURNER MAX AND MIN

INLET PRESSURE

Next: End

PRESSURE BURNER MAX AND MIN - MINIMUM OUT

GAS VALVE - HONEYWELL

Next: End

PRESSURE IGNITION

PCB - IGNITION RATE

Next: End

PRESSURE BURNER MAX - DHW SENSOR

TEMPERATURE PROBE

Next: End

PRESSURE BURNER MAX

KNOB

Next: End

PRESSURE BURNER MAXIMUM

INLET PRESSURE

Next: End

PRESSURE BURNER MAX

PCB

Next: End

PRESSURE BURNER MAX

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION FAN RUNS

THERMOSTAT 105DEG C - OVERHEAT

Next: End

OPERATION DHW - DHW COOL RADS COOL

INLET PRESSURE

Next: End

OBSERVATION FAN RUNS

PROBE - FLUE TEMPERATURE

Next: End

OPERATION DHW - DHW COOL RADS COOLPRESSURE BURNER MAX

PCB

Next: End

OPERATION DHW - DHW COOL RADS COOL

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OPERATION DHW - DHW TOO COOL DHW SENSOR

TEMPERATURE PROBE

Next: End

OPERATION DHW - TOO COOL

PROBE - FLUE TEMPERATURE

Next: End

PRESSURE MIN

Z REDIRECT

Next: End

FAULT CODE 222 - UNABLE TO RESET

PCB

Next: End

FUSE INVESTIGATION

ACTUATOR - DIVERTER VALVE

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT

MOTOR - PUMP

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT

FAN

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

MAINS FUSE

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

ELECTRODE - IGNITION

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

ELECTRODE - DETECTION

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

CABLE - FLAME DETECTION ELECTRODE

Next: End

INFORMATION CASE REMOVAL

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

FUSE 3 15AF

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

BURNER

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

ELECTRODE - IGNITION

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

BURNER

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING - LOW PRESSURE

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING - NO PRESSURE

INLET PRESSURE

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH - FAULTY LED

PCB

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING - LOW PRESSURE

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH - NO POWER TO PUMP

PCB

Next: End

OBSERVATION BOILER STANDBY - FAULT CODES 2

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OPERATION DHW - DHW RUNS HOT COLD

MOTOR - PUMP

Next: End

OPERATION DHW - DHW RUNS HOT COLD DHW SENSOR

TEMPERATURE PROBE

Next: End

OPERATION DHW - DHW RUNS HOT COLD PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

OPERATION DHW - DHW TOO HOT

KNOB

Next: End

OPERATION DHW - DHW TOO HOT DHW SENSOR

TEMPERATURE PROBE

Next: End

OPERATION DHW - DHW TOO COOL

KNOB

Next: End

OPERATION DHW - DHW TOO COOL

MOTOR - PUMP

Next: End

SEQUENCE OF OPERATION

Z REDIRECT

Next: End

OBSERVATION BOILER SELF CHECK - PUMP RUNS WITH NO DEMAND

OPEN TAP OR LEAK

Next: End

INFORMATION PCB MODIFICATION

Z REDIRECT

Next: End

OBSERVATION RESET CLOCK

Z REDIRECT

Next: End

OBSERVATION BOILER SELF CHECK - PUMP RUNS WITH NO DEMAND

CLOCK BATTERY

Next: End

OBSERVATION BOILER SELF CHECK - PUMP RUNS WITH NO DEMAND

CABLE - TIME SWITCH

Next: End

OBSERVATION DHW FLOW RATE

TAP 1/2IN - DHW

Next: End

OBSERVATION FAN RUNS

TUBE (AIR PRESSURE SWITCH)

Next: End

OBSERVATION FAN RUNS

VENTURI

Next: End

OBSERVATION FAN RUNS - APS

CABLE - FAN

Next: End

OBSERVATION PUMP RUNS - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

OBSERVATION PUMP RUNS

PROBE - FLUE TEMPERATURE

Next: End

OBSERVATION PUMP RUNS

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND - EXTERNAL CONTROLS

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

CABLE - FLOW SWITCHES TO TEMP...

Next: End

FAULT CODE 202 DHW

OPEN TAP OR LEAK

Next: End

FAULT CODE 202 DHW

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

FROST PROTECTION

Next: End

FAULT CODE 202 CH

Z REDIRECT

Next: End

FAULT CODE 202 CH

CLOCK BATTERY

Next: End

FAULT CODE 202 CH

CABLE - TIME SWITCH

Next: End

FAULT CODE 202 CH - EXTERNAL CONTROLS

Next: End

FAULT CODE 220

FROST PROTECTION

Next: End

FAULT CODE 220 - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

FAULT CODE 111

PCB

Next: End

OBSERVATION BOILER STANDBY - PRIMARY SENSOR - PUMP RUNS WITH NO DEMAND

TEMPERATURE PROBE

Next: End

FAULT CODE 002 - PRIMARY SENSOR - WILL NOT RESET

TEMPERATURE PROBE

Next: End

FAULT CODE 002 - WILL NOT RESET

PCB

Next: End

FAULT CODE 002

MOTOR - PUMP

Next: End

FAULT CODE 002 - DHW SENSOR - CUTS OUT

TEMPERATURE PROBE

Next: End

FAULT CODE 002

INLET PRESSURE

Next: End

FAULT CODE 002 - INCORRECT VOLTAGE TO GAS VALVE

PCB

Next: End

FAULT CODE 002

CABLE - FLOW SWITCHES TO TEMP...

Next: End

FAULT CODE 002 - DHW SENSOR - DOES NOT MODULATE

TEMPERATURE PROBE

Next: End

FAULT CODE 022

PCB

Next: End

FAULT CODE 021

PCB

Next: End

FAULT CODE 120

PCB

Next: End

FAULT CODE 120

PROBE - FLUE TEMPERATURE

Next: End

FAULT CODE 112

PROBE - FLUE TEMPERATURE

Next: End

FAULT CODE 112 - WILL NOT RESET

PCB

Next: End

FAULT CODE 212

Z REDIRECT

Next: End

FAULT CODE 122 - OPEN CIRCUIT

THERMOSTAT 105DEG C - OVERHEAT

Next: End

FAULT CODE 122 - RUNNING SLOW

MOTOR - PUMP

Next: End

FAULT CODE 122 - NO PUMP OVERRUN

PCB

Next: End

FAULT CODE 122

RECUPERATOR

Next: End

FAULT CODE 122

Next: End

FAULT CODE 122 - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

FAULT CODE 021 - DHW SENSOR

TEMPERATURE PROBE

Next: End

FAULT CODE 022 - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

FAULT CODE 221 - APS SHORT CIRCUIT

CABLE - FAN

Next: End

FAULT CODE 221 - FAN DOES NOT RUN

TUBE (AIR PRESSURE SWITCH)

Next: End

FAULT CODE 221 - FAN DOES NOT RUN

VENTURI

Next: End

FAULT CODE 221 - NO POWER TO FAN

PCB

Next: End

FAULT CODE 221 - FAN

CABLE - FAN

Next: End

FAULT CODE 221 - FAN RUNS

SWITCH - AIR PRESSURE

Next: End

FAULT CODE 221 - APS OPEN CIRCUIT

CABLE - FAN

Next: End

FAULT CODE 221 - FAN RUNS

TUBE (AIR PRESSURE SWITCH)

Next: End

FAULT CODE 221

FLUE

Next: End

FAULT CODE 221

HEAT EXCHANGER - MAIN

Next: End

FAULT CODE 221

RECUPERATOR

Next: End

FAULT CODE 122 - NO POWER TO PUMP

PCB

Next: End

FAULT CODE 122

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

FAULT CODE 210 - NO POWER TO PUMP

PCB

Next: End

FAULT CODE 210

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

FAULT CODE 210 - RUNNING SLOW

MOTOR - PUMP

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

FAULT CODE 210

DIAPHRAGM - PRESSURE SWITCH - CH

Next: End

FAULT CODE 210

KIT - MICROSWITCH

Next: End

OBSERVATION PUMP OVERRUN

PCB

Next: End

OBSERVATION DHW - DHW TOO COOL

RECUPERATOR

Next: End

OBSERVATION DHW FLOW RATE

MAINS WATER SUPPLY / TAP

Next: End

OPERATION DHW - DHW RUNS HOT COLD

RECUPERATOR

Next: End

OBSERVATION DHW MODULATION

KNOB

Next: End

OBSERVATION DHW MODULATION - DHW SENSOR

TEMPERATURE PROBE

Next: End

OBSERVATION CH MODULATION - PRIMARY SENSOR

TEMPERATURE PROBE

Next: End

OBSERVATION CH MODULATION

KNOB

Next: End

OBSERVATION DHW FLOW RATE

FLOW SWITCH - MAGNETIC

Next: End

OBSERVATION BURNER IGNITION NO IGNITION ADJUSTMENT

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION NOT ESTABLISHING ADJUSTMENT

Z REDIRECT

Next: End

FUSE INVESTIGATION - LEAK

ACTUATOR AND KIT - DIVERTER VALVE

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

PCB AND GAS VALVE

Next: End

EXCESSIVE SYSTEM PRESSURE

EXPANSION VESSEL

Next: End

OPERATION DHW - TOO COOL RADS HEAT

PCB

Next: End

OPERATION DHW - TOO COOL RADS HEAT

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

FAULT CODE 002

ACTUATOR - DIVERTER VALVE

Next: End

OPERATION CH RADS DO NOT HEAT

ACTUATOR - DIVERTER VALVE

Next: End

OPERATION CH RADS DO NOT HEAT

Next: End

OPERATION CH - RADS COOL

PCB

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

WIRE - DETECTION TO TRAP

Next: End

FAULT CODE 112 - TRIPPING EARLY

PCB

Next: End

FAULT CODE 112

RECUPERATOR

Next: End

FAULT CODE 002

HEAT EXCHANGER - MAIN

Next: End

FAULT CODE 002

HEAT EXCHANGER - DHW

Next: End

OBSERVATION FAN RUNS

FAN

Next: End

FAULT CODE 020 - STUCK IN FAULT

PCB

Next: End

FAULT CODE 020

CABLE - FLAME DETECTION ELECTRODE

Next: End

FAULT CODE 020 - READING FLAME AFTER CUTOFF

PCB

Next: End

FAULT CODE 020 - NOT SHUTTING

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT ILLUMINATE

FLOW SWITCH - DHW

Next: End

OBSERVATION FAN RUNS

KIT - FLOW GROUP

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITHOUT INTEGRAL

PCB

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITH INTEGRAL TIMER ILLUMINATED

TIME SWITCH

Next: End

OBSERVATION FAN RUNS - NO POWER TO FLOW SWITCH

PCB

Next: End

FAULT 221 - CLOGGED

FAN

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - SHORTING TO EARTH

CABLE - FLAME DETECTION ELECTRODE

Next: End

OBSERVATION FAN RUNS - PUMP PROVING MICROSWITCH

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING - WEAK SPARK

PCB

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

PCB

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

GASKET - INLET - FAN

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

GASKET - FAN OUTLET

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

VENTURI

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING - CLOGGED

FAN

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

FAN

Next: End

OBSERVATION PUMP RUNS - NO POWER TO FLOW SWITCH

PCB

Next: End

OBSERVATION PUMP RUNS

FLOW SWITCH - MAGNETIC

Next: End

OBSERVATION PUMP RUNS

FLOW SWITCH - DHW

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

GAS VALVE ADJUSTMENT

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES - MINIMUM OUT

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES - MAXIMUM OUT

GAS VALVE - HONEYWELL

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

Next: End

OBSERVATION BURNER IGNITES - IGNITES BUT BAFFLES

GASKET - INLET - FAN

Next: End

OBSERVATION BURNER IGNITES - IGNITES BUT BAFFLES

GASKET - FAN OUTLET

Next: End

OBSERVATION BURNER IGNITES - IGNITES BUT BAFFLES

VENTURI

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES - CLOGGED

FAN

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT BAFFLES

FAN

Next: End

PRESSURE BURNER MAXIMUM

GAS VALVE ADJUSTMENT

Next: End

PRESSURE BURNER MAXIMUM - MINIMUM OUT

GAS VALVE - HONEYWELL

Next: End

PRESSURE BURNER MAX - MAXIMUM OUT

GAS VALVE - HONEYWELL

Next: End

OBSERVATION FAN RUNS - OVERHEAT STAT

CABLE - FAN

Next: End

OBSERVATION FAN RUNS - NO POWER TO FAN

PCB

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH - MAINS FUSE

Z REDIRECT

Next: End

OPERATION DHW - DHW COOL

INJECTOR

Next: End

OBSERVATION FAN RUNS - FLUE SENSOR

CABLE - FAN

Next: End

OPERATION DHW - DHW COOL RADS COOL]

GAS VALVE ADJUSTMENT

Next: End

OPERATION DHW - DHW COOL RADS COOL

GAS VALVE - HONEYWELL

Next: End

OPERATION DHW - DHW COOL RADS COOL - MAXIMUM OUT

GAS VALVE - HONEYWELL

Next: End

OPERATION DHW - DHW TOO COOL

PCB

Next: End

PRESSURE BURNER MAX AND MIN

GAS VALVE ADJUSTMENT

Next: End

FAULT CODE 222

PCB FAULT THREE LIGHTS FLASHING

Next: End

FUSE INVESTIGATION - SHORT TO DIVERTER VALVE

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT TO PUMP

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT TO FAN

CABLE - FAN

Next: End

FURTHER INVESTIGATION

FUSE BLOWN

Next: End

FUSE INVESTIGATION - SHORT CIRCUIT TO GAS VALVE

CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

CABLE - POWER SUPPLY & EXT CONTROL

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

CABLE - IGNITION ELECTRODE

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH - PCB FUSE

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING - NOT RECOGNISING FLAME

PCB

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

INJECTOR

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

INJECTOR

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH - FAULTY LED

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - FAULT CODES 1

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING - NO PRESSURE

GAS VALVE - HONEYWELL

Next: End

OBSERVATION FAN RUNS

GAUGE - TEMPERATURE & PRESSURE

Next: End

OBSERVATION FAN RUNS

SYSTEM PRESSURE

Next: End

OPERATION DHW - DHW RUNS HOT COLD

GAUGE - TEMPERATURE & PRESSURE

Next: End

OPERATION DHW - DHW RUNS HOT / COLD

SYSTEM PRESSURE

Next: End

OPERATION DHW - DHW RUNS HOT COLD - BURNER PRESSURE OK

PCB

Next: End

OPERATION DHW - DHW RUNS HOT COLD

HEAT EXCHANGER - DHW

Next: End

OPERATION DHW - DHW TOO HOT

PCB

Next: End

OPERATION DHW - DHW TOO COOL

GAUGE - TEMPERATURE & PRESSURE

Next: End

OPERATION DHW - DHW TOO COOL

SYSTEM PRESSURE

Next: End

OPERATION DHW - DHW TOO COOL

HEAT EXCHANGER - DHW

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND - STUCK ON DHW DEMAND

PCB

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND - WITH INTEGRAL TIMER BLANK

TIME SWITCH

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND - NO EXTERNAL CONTROLS

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

TIME SWITCH

Next: End

OBSERVATION FAN RUNS

SWITCH - AIR PRESSURE

Next: End

OBSERVATION PUMP RUNS - PRIMARY SENSOR

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OBSERVATION PUMP RUNS - IGNORING DHW DEMAND

PCB

Next: End

OBSERVATION PUMP RUNS - FLUE SENSOR

CABLE - FAN

Next: End

OBSERVATION PUMP RUNS

MOTOR - PUMP

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

FLOW SWITCH - DHW

Next: End

FAULT CODE 202 DHW

PCB

Next: End

FAULT CODE 202 DHW

FLOW SWITCH - MAGNETIC

Next: End

FAULT CODE 202 DHW

FLOW SWITCH - DHW

Next: End

FAULT CODE 202 CH - WITH INTEGRAL TIMER BLANK

TIME SWITCH

Next: End

FAULT CODE 202 CH - NO EXTERNAL CONTROLS

Next: End

FAULT CODE 202 CH - PUMP RUNS WITH NO DEMAND

TIME SWITCH

Next: End

FAULT CODE 202 CH

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND - STUCK IN FROST PROTECTION

PCB

Next: End

FAULT CODE 220

PCB

Next: End

FAULT CODE 111

Z REDIRECT

Next: End

FAULT CODE 002 - DISPLAYING AT LOW TEMP

PCB

Next: End

FAULT CODE 002

GAS VALVE ADJUSTMENT

Next: End

FAULT CODE 002 - MINIMUM OUT

GAS VALVE - HONEYWELL

Next: End

FAULT CODE 002 - MAXIMUM OUT

GAS VALVE - HONEYWELL

Next: End

FAULT CODE 002

NO FAULT FOUND

Next: End

FAULT CODE 002 - NOT MODULATING ON DHW SENSOR

PCB

Next: End

FAULT CODE 022

Z REDIRECT

Next: End

FAULT CODE 021

Z REDIRECT

Next: End

FAULT CODE 120

Z REDIRECT

Next: End

FAULT CODE 120

CABLE - FAN

Next: End

FAULT CODE 112

NO FAULT FOUND

Next: End

FAULT CODE 122

CABLE - FAN

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS WITH NO DEMAND

FLOW SWITCH - MAGNETIC

Next: End

FAULT CODE 122 - WILL NOT RESET

PCB

Next: End

FAULT CODE 122

GAUGE - TEMPERATURE & PRESSURE

Next: End

FAULT CODE 122

SYSTEM PRESSURE

Next: End

FAULT CODE 122

HEAT EXCHANGER - DHW

Next: End

FAULT CODE 122

HEAT EXCHANGER - MAIN

Next: End

FAULT CODE 122

NO FAULT FOUND

Next: End

FAULT CODE 122 - TRIPPING EARLY

THERMOSTAT 105DEG C - OVERHEAT

Next: End

FAULT CODE 122 - NOT SHUTTING DOWN

PCB

Next: End

OBSERVATION BOILER STANDBY - STANDBY LED DOES NOT FLASH

MOTOR - PUMP

Next: End

FAULT CODE 022

CABLE - FLOW SWITCHES TO TEMP...

Next: End

FAULT CODE 021

CABLE - FLOW SWITCHES TO TEMP...

Next: End

FAULT CODE 221 - FAN DOES NOT RUN

SWITCH - AIR PRESSURE

Next: End

FAULT CODE 221 - NOT RUNNING

FAN

Next: End

FAULT CODE 221 - IGNORING APS

PCB

Next: End

FAULT CODE 221

GASKET - INLET - FAN

Next: End

FAULT CODE 221

GASKET - FAN OUTLET

Next: End

FAULT CODE 221 - FAN RUNS

VENTURI

Next: End

FAULT CODE 221 - RUNNING SLOW

FAN

Next: End

FAULT CODE 122 - NOT RUNNING

MOTOR - PUMP

Next: End

FAULT CODE 210 - NOT RUNNING

MOTOR - PUMP

Next: End

FAULT CODE 210

GAUGE - TEMPERATURE & PRESSURE

Next: End

FAULT CODE 210

SYSTEM PRESSURE

Next: End

FAULT CODE 210

KIT - FLOW GROUP

Next: End

FAULT CODE 210 - IGNORING PUMP PROVING SWITCH

PCB

Next: End

FAULT CODE 210 - NO POWER TO FLOW SWITCH

PCB

Next: End

FAULT CODE 210

CABLE - FLOW SWITCHES TO TEMP...

Next: End

OPERATION DHW - DHW TOO COOL

HEAT EXCHANGER - MAIN

Next: End

OPERATION DHW - DHW RUNS HOT COLD

HEAT EXCHANGER - MAIN

Next: End

OBSERVATION DHW MODULATION

PCB

Next: End

OBSERVATION CH MODULATION

PCB

Next: End

OBSERVATION DHW FLOW RATE

HEAT EXCHANGER - DHW

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING - LOW PRESSURE

GAS VALVE ADJUSTMENT

Next: End

OBSERVATION BURNER IGNITION - NOT ESTABLISHING

GAS VALVE ADJUSTMENT

Next: End

OBSERVATION BURNER IGNITION - NOT IGNITING

PCB

Next: End

OBSERVATION BURNER IGNITION

PCB AND CABLE - PUMP TO DIVERTER VALVE TO...

Next: End

EXCESSIVE SYSTEM PRESSURE

PIPE - CONNECTION - EXPANSION VESSEL

Next: End

OPERATION DHW - TOO COOL RADS HEAT

ACTUATOR - DIVERTER VALVE

Next: End

OPERATION DHW - TOO COOL RADS HEAT

SERVICE KIT - DIVERTER VALVE

Next: End

FAULT CODE 002

SERVICE KIT - DIVERTER VALVE

Next: End

BOILER REACHES TEMPERATURE RADIATORS DO NOT HEAT SUFFICIENTLY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1004

FLUE TEMPERATURE REMAINS BELOW 100°C BUT FAULT CODE REOCCURS

Next: !p1042

FLUE GAS TEMPERATURE ABOVE 100°C

CHARACTERISTIC TEST FROM TEMPERATURE FLUE

Next: p1045

PUMP AND FAN RUN BUT SPARKING DOES NOT OCCUR THEN FAULT REAPPEARS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET - FALSE FLAME

Next: p1092

FAULT CODE REAPPEARS WITHOUT PUMP OR FAN RUNNING

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET - FALSE FLAME

Next: !p1094

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP ON TEST 2

CHARACTERISTIC TEST FROM VOLTAGE PUMP PROVING SWITCH AT PCB

Next: p120

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE PUMP PROVING SWITCH AT PCB

Next: !p122

FAN CLOGGED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1223

NO SPARKING OBSERVED

CHARACTERISTIC TEST FROM OBSERVATION SPARKING AT PCB

Next: p1233

SPARKING PRESENT BUT WEAK OR INTERMITTENT

CHARACTERISTIC TEST FROM OBSERVATION SPARKING AT PCB

Next: !p1232

FAN INLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1251

FAN OUTLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1253

FAN VENTURI DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1255

FAN CLOGGED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1257

VOLTAGE AS ABOVE ON TEST 1 BUT WRONG ON TEST 2

CHARACTERISTIC TEST FROM VOLTAGE FLOW SWITCH AT PCB

Next: p1264

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE PUMP PROVING SWITCH AT PCB

Next: !p1263

UNABLE TO SET MINIMUM PRESSURE CORRECTLY

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: !p1286

MINIMUM SET CORRECTLY BUT UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: p1288

FAN INLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1300

FAN OUTLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1302

FAN VENTURI DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1304

FAN CLOGGED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p1306

UNABLE TO SET MINIMUM PRESSURE CORRECTLY

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: !p1338

MINIMUM SET CORRECTLY BUT UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: p1340

PRESSURE REACHES MAXIMUM BUT THEN MODULATES DOWN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: p1409

PRESSURE NEVER REACHES MAXIMUM

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: p1411

UNABLE TO SET MINIMUM PRESSURE CORRECTLY

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: !p1417

MINIMUM SET CORRECTLY BUT UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: p1419

NO SPARKING PRESENT

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p145

BURNER IGNITES SMOOTHLY BUT DOES NOT ESTABLISH (SPARKING CONTINUES)

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p188

VOLTAGE ABSENT

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION CIRCUIT

Next: p1224

VOLTAGE PRESENT BUT DOES NOT DROP

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION CIRCUIT

Next: p194

SPARKING PRESENT BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p208

PRESSURE PRESENT BUT LOW

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION CIRCUIT

Next: p211

PRESSURE REMAINS AT 0MBAR

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION CIRCUIT

Next: p213

BURNER IGNITES BUT BAFFLES AND/OR FLAME LIFTS OFF

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p1274

SYSTEM PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p363

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p365

DHW COOL, RADIATORS REMAIN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p368

DHW COOL, RADIATORS BEGIN TO HEAT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p912

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p372

DHW RUNS HOT / COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p374

SYSTEM PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p377

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p379

NO LEDS ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p5

SYSTEM PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p407

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p409

NO EXTERNAL CONTROLS FITTED AND INTEGRAL TIMER DISPLAY IS ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p449

NO EXTERNAL CONTROLS FITTED AND INTEGRAL TIMER DISPLAY IS BLANK

CHARACTERISTIC TEST FROM OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p443

PUMP DOES NOT RUN ON EITHER TEST

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS (NO DEMAND)

Next: p49

PUMP RUNS ON TEST 1

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS (NO DEMAND)

Next: p58

NO EXTERNAL CONTROLS FITTED AND INTEGRAL TIMER DISPLAY IS ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p594

NO EXTERNAL CONTROLS FITTED AND INTEGRAL TIMER DISPLAY IS BLANK

CHARACTERISTIC TEST FROM OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p596

ADDITIONAL LIGHTS FLASHING OR ILLUMINATED / FAULT CODE SHOWING

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p7

CH FLOW PIPE BEGINS TO HEAT

CHARACTERISTIC TEST FROM OPERATION DHW (FAULT CODE)

Next: p644

BURNER CUTS OUT AND/OR FAULT CODE REAPPEARS

CHARACTERISTIC TEST FROM OPERATION DHW (FAULT CODE)

Next: p646

UNABLE TO SET MINIMUM PRESSURE CORRECTLY

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: !p673

MINIMUM SET CORRECTLY BUT UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM ADJUSTMENT PRESSURE MAX AND MIN

Next: p675

SYSTEM PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p747

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p748

BOILER GOES TO OVERHEAT - TEMPERATURE BELOW 82°C

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

Next: !p772

BOILER FLOW TEMPERATURE EXCEEDS 86°C AND BOILER STILL FIRED

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

Next: p774

PUMP RUNS WITH NO DEMAND OR BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p9

FAN INLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p831

FAN OUTLET SEAL DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p833

FAN VENTURI DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION VENTURI AND FAN SEALS

Next: !p835

SYSTEM PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p854

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p856

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP ON TEST 2

CHARACTERISTIC TEST FROM VOLTAGE PUMP PROVING SWITCH AT PCB

Next: p864

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE PUMP PROVING SWITCH AT PCB

Next: !p866

BOILER AND RADIATOR TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p984

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p986

06/08/2019 10:04:13 1907_1_50_1 21/11/2022 09:19:44

04/11/2022 09:21:36

Next: End

VOLTAGE MAINS IN AT CONNECTOR

{GAINPCBACS}

Next: !p16, f11

VOLTAGE DIVERTER VALVE CH AT PCB

{GAINPCBACS}

Next: p1013, !f1014

INSPECTION TRAP AND PIPEWORK

Next: !p1039, !f1040

OBSERVATION PUMP PROVING SPINDLE

Next: p108, f109

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE P

Next: !p1054, f1051

INSPECTION RECUPERATOR HEAT EXCHANGER

BOILER PRIMARY CIRCUIT DRAINED

Next: !p1052, !f1053

OBSERVATION BOILER RESET - FALSE FLAME

Next: p1090, ?1091, ?1093

INSPECTION PRESSURE SYSTEM

Next: p110, ?362, ?364

RESISTANCE FUSE (MAINS)

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p13, f12

VOLTAGE GAS VALVE AT PCB AFTER DEMAND

{GAINPCBACS}

Next: !p1103, !f1104

OBSERVATION DISCONNECT DHW FLOW SWITCH

RECONNECT CONNECTOR

Next: !p1116, !f1117

INSPECTION CH POTENTIOMETER

{GAINPCBACS}

Next: p1167, !f1182

VOLTAGE CH DEMAND FROM BOILER

{GAINPCBACS}

Next: !p1170, f1171

RESISTANCE HARNESS X1 TO EXTERNAL CONTROLS BLOCK

DISCONNECT CONNECTOR

Next: !p1172, !f1173

FURTHER INVESTIGATION MAINS FUSE

Next: !p14, !f15

RESISTANCE HARNESS AIR PRESSURE SWITCH

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: !p1238, !f1239

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR FROM FLOW SWITCH
DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p1267, !f1268

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p1281, !f1282

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p1310, !f1311

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: p1329, !f1330

RESISTANCE OVERHEAT THERMOSTAT

GAIN ACCESS TO INNER

Next: !p136, !f137

RESISTANCE SENSOR FLUE

REMOVE COMBUSTION CHAMBER COVER
DISCONNECT WIRES TO FLUE SENSOR

Next: !p141, !f142

OBSERVATION RESET NEW PCB WITH AIR PRESSURE SWITCH

CONNECT THE AIR PRES

Next: !p1433, !f1434

RESISTANCE DIVERTER VALVE ACTUATOR

REMOVE DIVERTER VALVE ACTUATOR AND DISCONNECT ELECTRICAL CONNECTOR

Next: !p1437, !f1438

RESISTANCE PUMP

REMOVE PLUG FROM TOP OF PUMP

Next: !p1442, !f1443

RESISTANCE FAN

DISCONNECT WIRES TO THE FAN

Next: !p1446, !f1447

RESISTANCE GAS VALVE SOLENOIDS WITH EARTH CHECK

DISCONNECT LEAD FROM GAS VALVE

Next: !p1450, !f1451

FURTHER INVESTIGATION PCB FUSE

Next: !p19, !f20

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p203, !f206

RESISTANCE GAS VALVE AT GAS VALVE

DISCONNECT LEAD FROM GAS VALVE

Next: !p981, !f982

VOLTAGE PUMP AT PCB (BOTH DEMANDS)

Next: p28, !f29

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE P

Next: !p388, f891

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE P

Next: !p414, f870

RESISTANCE HARNESS FLOW SWITCH (OPEN CIRCUIT)

DISCONNECT THE FLOW SWITCH CONNECTOR FROM THE FLOW SWITCH
DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p56, !f57

INSPECTION HARNESS CLOCK

REMOVE CLOCK HARNESS FROM PCB

Next: !p453, !f454

RESISTANCE AIR PRESSURE SWITCH (NORMALLY OPEN)

DISCONNECT WIRES FROM AIR PRESSURE SWITCH

Next: p476, !f481

RESISTANCE SENSOR PRIMARY AND HARNESS

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p494, f495

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p496, !f497

RESISTANCE SENSOR FLUE

REMOVE COMBUSTION CHAMBER COVER
DISCONNECT WIRES TO FLUE SENSOR

Next: !p500, !f501

OBSERVATION ISOLATE DHW

ISOLATE COLD MAINS SUPPLY TO APPLIANCE BY TURNING THE BLUE ISOLATION VALVE 90° CLOCKWISE

Next: p582, !f583

OBSERVATION DISCONNECT FLOW SWITCH

LIFT THE FLOW SWITCH AWAY FROM ITS HOUSING AND MAKE SAFE

Next: !p586, f587

RESISTANCE HARNESS FLOW SWITCH (OPEN CIRCUIT)

DISCONNECT THE FLOW SWITCH CONNECTOR FROM THE FLOW SWITCH
DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p588, !f589

OBSERVATION ARE EXTERNAL CONTROLS FITTED

DOES THE SYSTEM HAVE

Next: p592, ?593, ?595

INSPECTION HARNESS CLOCK

REMOVE CLOCK HARNESS FROM PCB

Next: !p603, !f604

TEMPERATURE AMBIENT

Next: p619, !f620

OBSERVATION BOILER RESET - PCB FAULT

Next: !p624, !f625

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p637, !f638

VOLTAGE FLOW SWITCH AT PCB

{GAINPCBACS}

Next: p482, ?1260, ?1262

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p668, !f669

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: !p683, !f684

RESISTANCE SENSOR PRIMARY AND HARNESS

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p686, f687

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p779, !f782

OBSERVATION DISCONNECT FLOW SWITCH

LIFT THE FLOW SWITCH AWAY FROM ITS HOUSING AND MAKE SAFE

Next: !p74, f43

RESISTANCE SENSOR DHW AND HARNESS

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p707, f708

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: !p781, !f780

RESISTANCE SENSOR FLUE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: p715, f716

RESISTANCE SENSOR FLUE

REMOVE COMBUSTION CHAMBER COVER
DISCONNECT WIRES TO FLUE SENSOR

Next: !p722, !f721

RESISTANCE SENSOR FLUE

REMOVE COMBUSTION CHAMBER COVER
DISCONNECT WIRES TO FLUE SENSOR

Next: p727, !f726

OBSERVATION BOILER RESET - OVERHEAT FAULT

ENSURE BOILER IS COOL

Next: p741, f736

RESISTANCE OVERHEAT THERMOSTAT AND HARNESS

DISCONNECT CONNECTOR X4 AT THE PCB

Next: !p740, f737

RESISTANCE OVERHEAT THERMOSTAT

GAIN ACCESS TO INNER

Next: !p738, !f739

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE P

Next: !p763, f764

INSPECTION RECUPERATOR HEAT EXCHANGER

BOILER PRIMARY CIRCUIT DRAINED

Next: !p765, !f766

OBSERVATION FAN RUNS

DHW TEMPERATURE SELECTOR SET TO MAX

Next: p815, f802

RESISTANCE AIR PRESSURE SWITCH AT PCB (NORMALLY OPEN)

{GAINPCBACS}

Next: p803, f804

RESISTANCE AIR PRESSURE SWITCH (NORMALLY OPEN)

DISCONNECT WIRES FROM AIR PRESSURE SWITCH

Next: p805, !f806

RESISTANCE HARNESS AIR PRESSURE SWITCH

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: !p820, !f821

VOLTAGE PUMP AT PCB

Next: p839, !f840

OBSERVATION PUMP RUNS (FAULT CODE)

DHW TEMPERATURE SELECTOR SET TO MAX
CH TEMPERATURE SELECTOR SET TO MAX

Next: p844, f845

VOLTAGE PUMP AT PCB (BOTH DEMANDS)

Next: p846, !f847

INSPECTION PRESSURE SYSTEM

Next: p852, ?853, ?855

INSPECTION RECUPERATOR HEAT EXCHANGER

BOILER PRIMARY CIRCUIT DRAINED

Next: !p871, !f872

OBSERVATION MAINS WATER FLOW RATE

TURN COLD WATER TAP ON

Next: p455, !f89

INSPECTION RECUPERATOR HEAT EXCHANGER

BOILER PRIMARY CIRCUIT DRAINED

Next: !p892, !f893

INSPECTION DHW POTENTIOMETER

{GAINPCBACS}

Next: p895, !f896

INSPECTION CH POTENTIOMETER

{GAINPCBACS}

Next: p906, !f909

INSPECTION DIVERTER VALVE ACTUATOR

REMOVE DIVERTER VALV

Next: p1435, !f927

RESISTANCE AIR PRESSURE SWITCH AT PCB (NORMALLY OPEN)

{GAINPCBACS}

Next: p100, f465

RESISTANCE GAS VALVE AT PCB

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: !p980, f225

VOLTAGE DIVERTER VALVE DHW AT PCB

{GAINPCBACS}

Next: p991, !f992

VOLTAGE DIVERTER VALVE DHW AT PCB

{GAINPCBACS}

Next: p999, !f1000

VOLTAGE FAN AT PCB

Next: p105, f104

INSPECTION SYSTEM VENTED

Next: p1005, !f1006

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1007, !f1008

LIMPET TEST

Next: p1009, !f1010

OBSERVATION DIVERTER VALVE MOVEMENT (CH)

REMOVE DIVERTER VALV

Next: p1011, f1012

INSPECTION DIVERTER VALVE SPINDLE

REMOVE DIVERTER VALV

Next: p1017, !f1018

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: !p1015, !f1016

TEMPERATURE DIFFERENTIAL INTERNAL BYPASS

ENSURE RADIATORS ARE

Next: !p1019, !f1020

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p1023, !f1024

OBSERVATION DISCONNECT CONDENSATE LEAD

DISCONNECT THE LEAD FROM THE CONDENSATE TRAP TO THE RECTIFICATION LEAD

Next: p189, f1038

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO PRIMARY HEAT EXCHANGER

Next: !p1046, !f1047

VOLTAGE FAN AT FAN

REMOVE COMBUSTION CHAMBER

Next: !p106, !f107

VOLTAGE PUMP PROVING SWITCH AT PCB

{GAINPCBACS}
HOT WATER TAP OFF

Next: p129, ?119, ?121

OBSERVATION FLAME SHUT OFF DELAY

ENSURE NO CH DEMAND

Next: !p1101, f1102

INSPECTION PCB AND CONNECTIONS

{GAINPCBACS}

Next: p1095, !f1096

OBSERVATION DISCONNECT RECTIFICATION LEAD

DISCONNECT RECTIFICATION LEAD FROM THE PCB AND MAKE SAFE

Next: p1097, !f1098

INSPECTION RECTIFICATION ELECTRODE

GAIN ACCESS TO BURNER

Next: !p1099, !f1100

LIMPET TEST

Next: p114, !f115

OBSERVATION DISCONNECT X2

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p21, f1115

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p125, !f126

INSPECTION PUMP PROVING DIAPHRAGM

DRAIN BOILER PRIMARY CIRCUIT
UNCLIP PUMP PROVING SWITCH

Next: !p117, !f118

VOLTAGE CH DEMAND INTO BOILER

{GAINPCBACS}

Next: p1168, f1169

RESISTANCE HARNESS X1 TO EXTERNAL CONTROLS BLOCK

DISCONNECT CONNECTOR

Next: p1174, !f1175

OBSERVATION IS INTERNAL CLOCK FITTED

IS AN INTEGRAL CLOCK FITTED TO THE BOILER?

Next: p1176, !f1177

OBSERVATION DISCONNECT CLOCK

DISCONNECT CONNECTOR X11 FROM THE PCB

Next: p1178, !f1179

INSPECTION HARNESS CLOCK

REMOVE CLOCK HARNESS FROM PCB

Next: !p1180, !f1181

INSPECTION TEST POINT

Next: p822, !f1199

RESISTANCE PUMP PROVING MICROSWITCH AT MICROSWITCH

REMOVE THE MICROSWITCH FROM ITS HOUSING AND DISCONNECT WIRES FROM PUMP PROVING MICROSWITCH

Next: !p123, !f124

VOLTAGE RECTIFICATION CIRCUIT WITHOUT LEAD

{GAINPCBACS}

Next: p1226, !f1225

INSPECTION RECTIFICATION ELECTRODE (SHORT)

GAIN ACCESS TO BURNER

Next: !p1227, !f1228

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT WIRES AND

Next: p1234, !f1235

OBSERVATION SPARKING WITH APS PROVEN

APS TEST KIT STILL C

Next: p1236, f1237

INSPECTION AIR PRESSURE SWITCH TUBES

Next: p1240, !f1241

INSPECTION TEST POINT

Next: p1242, !f1243

INSPECTION FLUE

Next: p1244, !f1245

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO PRIMARY HEAT EXCHANGER

Next: p1246, !f1247

INSPECTION VENTURI AND FAN SEALS

REMOVE FAN FROM APPL

Next: p1248, ?1250, ?1252, ?1254, ?1256

INSPECTION RECUPERATOR

REMOVE FAN FROM APPLIANCE

Next: !p1258, !f1259

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: p127, !f128

OBSERVATION PUMP RUNS WITH FLOW SWITCH MADE

UNCLIP THE FLOW SWIT

Next: !p1265, f1266

RESISTANCE SENSOR FLUE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: !p139, f140

INSPECTION TRAP AND PIPEWORK

Next: p1275, !f1276

INSPECTION FLUE

Next: p1277, !f1278

PRESSURE BURNER MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT
DHW TEMPERATURE SELECTOR SET TO MAX

Next: p1279, f1280

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO PRIMARY HEAT EXCHANGER

Next: p1293, !f1294

ADJUSTMENT PRESSURE MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: !p1283, ?1285, ?1287

VOLTAGE GAS VALVE MODUREG MAXIMUM AT PCB

{GAINPCBACS}
DISCONNECT WIRES TO GAS VALVE MODUREG

Next: p1289, !f1290

RESISTANCE HARNESS GAS VALVE MODUREG

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p1291, !f1292

RESISTANCE OVERHEAT THERMOSTAT AND HARNESS

DISCONNECT CONNECTOR X4 AT THE PCB

Next: p112, f135

INSPECTION RECUPERATOR

REMOVE FAN FROM APPLIANCE

Next: p1295, !f1296

INSPECTION VENTURI AND FAN SEALS

REMOVE FAN FROM APPL

Next: p1297, ?1299, ?1301, ?1303, ?1305

INSPECTION BURNER

GAIN ACCESS TO BURNER

Next: !p1307, !f1308

ADJUSTMENT PRESSURE MIN

ATTACH PRESSURE GAUG

Next: p1428, !f1323

INSPECTION DHW POTENTIOMETER

{GAINPCBACS}

Next: p1331, !f1332

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p1333, !f1334

ADJUSTMENT PRESSURE MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: !p1335, ?1337, ?1339

VOLTAGE GAS VALVE MODUREG MAXIMUM AT PCB

{GAINPCBACS}
DISCONNECT WIRES TO GAS VALVE MODUREG

Next: p1341, !f1342

RESISTANCE HARNESS GAS VALVE MODUREG

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p1343, !f1344

PRESSURE BURNER MAXIMUM

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT
DHW TEMPERATURE SELECTOR SET TO MAX

Next: !p1407, ?1408, ?1410

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: p1424, !f1425

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p1412, !f1413

ADJUSTMENT PRESSURE MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: !p1414, ?1416, ?1418

VOLTAGE GAS VALVE MODUREG MAXIMUM AT PCB

{GAINPCBACS}
DISCONNECT WIRES TO GAS VALVE MODUREG

Next: p1420, !f1421

RESISTANCE HARNESS GAS VALVE MODUREG

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p1422, !f1423

RESISTANCE SENSOR FLUE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: !p1426, !f1427

OBSERVATION ADDITIONAL FAULT MINIMUM PRESSURE

NOW THAT THE BURNER

Next: !p1429, !f1430

RESISTANCE DIVERTER VALVE ACTUATOR AND HARNESS

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: p1439, f1436

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: p1440, f1441

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR X7 FROM THE PCB

Next: p1444, f1445

RESISTANCE GAS VALVE SOLENOIDS AND HARNESS WITH EARTH CHECK

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: !p1448, f1449

OBSERVATION SPARKING AT PCB

LIFT ONE SPARK ELECTRODE LEAD APPROX. 5MM AWAY FROM THE SPADE CONNECTION AS SHOWN

Next: p184, ?1229, ?1231

RESISTANCE FUSES (PCB)

REMOVE BOTH FUSES FROM THE PCB

Next: p1105, f18

INSPECTION SPARK ELECTRODES

GAIN ACCESS TO BURNER

Next: !p185, !f186

PRESSURE IGNITION (FAULT)

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1025, f201

VOLTAGE RECTIFICATION CIRCUIT

{GAINPCBACS}
SET THE DVM TO MANUAL RANGE MODE WITH 2 DECIMAL PLACES
(I.E. DISPLAYS 0.00V DC)

Next: !p190, ?191, ?193

INSPECTION RECTIFICATION ELECTRODE

GAIN ACCESS TO BURNER

Next: p195, !f196

RESISTANCE RECTIFICATION LEAD

DISCONNECT FLAME SEN

Next: p197, !f198

INSPECTION BURNER

GAIN ACCESS TO BURNER

Next: !p199, !f200

ADJUSTMENT PRESSURE MIN FOR BURNER ESTABLISH

ATTACH PRESSURE GAUG

Next: p922, !f205

PRESSURE IGNITION (FAULT)

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p209, ?210, ?212

INSPECTION SPARK ELECTRODES

GAIN ACCESS TO BURNER

Next: p214, !f215

INFORMATION FAULTY LED

TESTS CARRIED OUT HA

Next: p23, !f22

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p220, !f218

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
ENSURE APPLIANCE IS COOL

Next: p223, !f219

INSPECTION BURNER

GAIN ACCESS TO BURNER

Next: !p216, !f217

ADJUSTMENT PRESSURE MIN FOR BURNER IGNITION

ATTACH PRESSURE GAUG

Next: p919, !f222

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p224, f976

RESISTANCE HARNESS GAS VALVE

DISCONNECT CONNECTOR AT GAS VALVE

Next: !p300, !f229

OBSERVATION PUMP RUNS (BOTH DEMANDS)

DHW TEMPERATURE SELECTOR SET TO MAX
CH TEMPERATURE SELECTOR SET TO MAX

Next: !p27, f26

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR AT TOP OF PUMP

Next: !p777, !f33

VOLTAGE FLOW SWITCH AT PCB (NO DEMAND)

{GAINPCBACS}
ENSURE NO DHW DEMAND

Next: !p42, f70

INSPECTION DHW POTENTIOMETER

{GAINPCBACS}

Next: p402, !f403

INSPECTION DHW POTENTIOMETER

{GAINPCBACS}

Next: p398, !f399

INSPECTION PRESSURE SYSTEM

Next: p375, ?376, ?378

LIMPET TEST

Next: p380, !f381

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: p382, !f383

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p384, !f385

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: !p386, f387

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: !p400, !f401

INSPECTION PRESSURE SYSTEM

Next: p404, ?406, ?408

LIMPET TEST

Next: p410, !f411

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p1406, f413

OBSERVATION ISOLATE DHW

ISOLATE COLD MAINS SUPPLY TO APPLIANCE BY TURNING THE BLUE ISOLATION VALVE 90° CLOCKWISE

Next: p34, !f437

OBSERVATION RESET CLOCK

Next: p446, !f444

VOLTAGE CLOCK BATTERY

UNCLIP AND REMOVE THE BATTERY AT THE BACK OF THE TIMER

Next: !p447, !f448

VOLTAGE CLOCK AT PCB (NO DEMAND)

{GAINPCBACS}
ENSURE CLOCK SET TO OFF

Next: !p450, f452

INSPECTION ISOLATION VALVE DHW

Next: p90, !f459

INSPECTION AIR PRESSURE SWITCH TUBES

Next: p477, !f478

INSPECTION FAN VENTURI

REMOVE FAN FROM APPL

Next: !p479, !f480

VOLTAGE PUMP AT PCB

Next: p502, f493

OBSERVATION ARE EXTERNAL CONTROLS FITTED

DOES THE SYSTEM HAVE

Next: p50, ?440, ?442

RESISTANCE SENSOR FLUE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: !p498, f499

VOLTAGE MAINS IN AT PCB

{GAINPCBACS}

Next: p17, f10

VOLTAGE CH DEMAND INTO BOILER (NO DEMAND)

{GAINPCBACS}

Next: !p54, !f55

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR AT TOP OF PUMP

Next: !p503, !f504

TEMPERATURE AMBIENT

Next: p60, !f59

VOLTAGE FLOW SWITCH AT PCB (NO DEMAND)

{GAINPCBACS}
ENSURE NO DHW DEMAND

Next: !p584, f585

VOLTAGE CH DEMAND INTO BOILER (NO DEMAND)

{GAINPCBACS}

Next: !p605, !f606

VOLTAGE CLOCK AT PCB (NO DEMAND)

{GAINPCBACS}
ENSURE CLOCK SET TO OFF

Next: !p601, f602

OBSERVATION RESET CLOCK

Next: p597, !f598

VOLTAGE CLOCK BATTERY

UNCLIP AND REMOVE THE BATTERY AT THE BACK OF THE TIMER

Next: !p599, !f600

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p62, !f63

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p621, !f622

OBSERVATION BOILER RESET - EXCESSIVE TEMP ON DHW OPERATION

ENSURE BOILER IS COOL

Next: p639, !f640

OPERATION DHW (FAULT CODE)

SET FLOW RATE TO 13.1 LITRES A MINUTE

Next: p666, ?643, ?645

OBSERVATION DIVERTER VALVE MOVEMENT (DHW)

REMOVE DIVERTER VALV

Next: !p997, f998

LIMPET TEST

Next: p660, !f653

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: p661, !f662

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: !p663, f1049

PRESSURE BURNER MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT
DHW TEMPERATURE SELECTOR SET TO MAX

Next: p680, f667

ADJUSTMENT PRESSURE MAX AND MIN

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: !p670, ?672, ?674

VOLTAGE GAS VALVE MODUREG MAXIMUM AT PCB

{GAINPCBACS}
DISCONNECT WIRES TO GAS VALVE MODUREG

Next: p676, !f677

RESISTANCE HARNESS GAS VALVE MODUREG

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p678, !f679

OBSERVATION DHW MODULATION

ADJUST DHW FLOW RATE

Next: !p681, f682

OBSERVATION BOILER RESET - SENSOR FAULT

ENSURE BOILER IS COOL

Next: !p688, !f689

FAULT CODES

PLEASE USE THE DROPD

Next: !p30, !f31

OBSERVATION BOILER RESET - SENSOR FAULT

ENSURE BOILER IS COOL

Next: !p711, !f712

OBSERVATION BOILER RESET - SENSOR FAULT

ENSURE BOILER IS COOL

Next: !p719, !f720

OBSERVATION BOILER RESET - FLUE LOCKOUT

ENSURE BOILER IS COOL

Next: p728, !f729

TEMPERATURE FLUE

CH TEMPERATURE CONTR

Next: !p730, ?1041, ?1043

INSPECTION PRESSURE SYSTEM

Next: p750, ?743, ?745

OBSERVATION PUMP RUNS

DHW TEMPERATURE SELECTOR SET TO MAX

Next: p751, f838

LIMPET TEST

Next: p757, !f758

OBSERVATION PUMP OVERRUN

Next: p759, !f760

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p761, f762

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE P

Next: p767, !f768

OBSERVATION RUN BOILER TO MAX TEMP - DOES OVERHEAT OCCUR

ATTACH TEMPERATURE CLAMP TO PRIMARY HEAT EXCHANGER
FLOW PIPE AS ILLUSTRATED

Next: !p769, ?771, ?773

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p775, !f776

VOLTAGE FAN AT PCB

Next: p811, !f812

INSPECTION AIR PRESSURE SWITCH TUBES

Next: p807, !f808

INSPECTION FAN VENTURI

REMOVE FAN FROM APPL

Next: !p809, !f810

VOLTAGE FAN AT FAN

REMOVE COMBUSTION CHAMBER

Next: !p813, !f814

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT WIRES AND

Next: p816, !f817

OBSERVATION SPARKING WITH APS PROVEN

APS TEST KIT STILL C

Next: p818, f819

INSPECTION AIR PRESSURE SWITCH TUBES

Next: p1183, !f823

INSPECTION FLUE

Next: p824, !f825

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO PRIMARY HEAT EXCHANGER

Next: p826, !f827

INSPECTION VENTURI AND FAN SEALS

REMOVE FAN FROM APPL

Next: p828, ?830, ?832, ?834, ?1222

INSPECTION RECUPERATOR

REMOVE FAN FROM APPLIANCE

Next: !p836, !f837

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR AT TOP OF PUMP

Next: !p841, !f842

OBSERVATION PUMP PROVING SPINDLE

Next: p850, f851

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR AT TOP OF PUMP

Next: !p848, !f849

VOLTAGE PUMP PROVING SWITCH AT PCB

{GAINPCBACS}
HOT WATER TAP OFF

Next: !p861, ?863, ?865

LIMPET TEST

Next: p857, !f858

INSPECTION PUMP PROVING DIAPHRAGM

DRAIN BOILER PRIMARY CIRCUIT
UNCLIP PUMP PROVING SWITCH

Next: !p859, !f860

RESISTANCE PUMP PROVING MICROSWITCH AT MICROSWITCH

REMOVE THE MICROSWITCH FROM ITS HOUSING AND DISCONNECT WIRES FROM PUMP PROVING MICROSWITCH

Next: !p867, !f868

RESISTANCE SENSOR DHW

DISCONNECT CONNECTOR FROM THE DHW THERMISTOR

Next: !p897, !f898

OBSERVATION PUMP RUNS (NO DEMAND)

ENSURE NO DEMAND FOR CH OR DHW
SET THE CH TEMPERATURE CONTROL TO 'O' POSITION

Next: p429, ?45, ?47

INSPECTION DHW FILTER

ISOLATE AND DRAIN DHW CIRCUIT
REMOVE FLOW SWITCH FROM ITS HOUSING

Next: !p92, !f91

RESISTANCE SENSOR PRIMARY

DISCONNECT CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p907, !f908

OBSERVATION DIVERTER VALVE MOVEMENT (DHW)

REMOVE DIVERTER VALV

Next: !p995, f990

OBSERVATION ADDITIONAL FAULT BURNER IGNITION

NOW THAT THE BURNER

Next: !p920, !f921

OBSERVATION ADDITIONAL FAULT BURNER ESTABLISH

NOW THAT THE BURNER

Next: !p923, !f924

INSPECTION CH POTENTIOMETER

{GAINPCBACS}

Next: p1021, !f1022

PRESSURE EXPANSION VESSEL

DISCHARGE PRIMARY SYSTEM WATER

Next: !p987, !f988

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: !p993, !f994

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT CONNECTOR X6B FROM THE PCB

Next: !p1001, !f1002

System Information

  • Total Tests: 701
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control