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:

BAXI COMBI 80 INSTANT HE

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY.

Next: nff

BAXI COMBI 80 INSTANT HE

Next: &609, !f926

DHW FLOW RATE

Next: &1067, f1413

DHW FAN RUNS

SELECTOR SWITCH TO D

Next: &6, ?35, ?37

DHW BURNER IGNITION

ATTACH PRESSURE GAUG

Next: &7, ?61, ?63, ?65, ?1280

DHW BURNER ESTABLISHED

ATTACH PRESSURE GAUG

Next: &938, ?94, ?96, ?98, ?1429

DHW MODULATION

SET FLOW RATE AT TAP

Next: &475, f157

CH OPERATION

SELECTOR SWITCH TO D

Next: &13, ?163, ?165, ?167, ?336

SYSTEM PRESSURE RISE

SELECTOR SWITCH TO D

Next: &14, !f193

CH MODULATION

ATTACH PRESSURE GAUG

Next: &15, f341

RE-IGNITION DELAY

SELECTOR SWITCH TO D

Next: &16, ?1541, ?1543

PUMP OVERRUNS

SELECTOR SWITCH TO D

Next: &nff, !f196

DHW PREHEAT

SELECTOR SWITCH TO D

Next: &965, f1408

CHOICE OF DIAGNOSTICS

Next: &3, !f610

FAULT CODES

Next: &nff, !f613

50 DEGREE LIGHT

Next: &nff, f1183

70 DEGREE LIGHT

Next: &nff, f663

80 DEGREE LIGHT

Next: &nff, f669

30 AND 40 LIGHTS

Next: &nff, f1032

DHW OPERATION

SELECTOR SWITCH TO D

Next: &10, ?939, ?941, ?943

CH IGNITION

ATTACH PRESSURE GAUG

Next: &12, ?1511, ?1513

30 + 50 DEGREE LIGHTS

BLANK PAGE

Next: &nff, f1343

DEMAND LIGHT LIT WITH TAP RUNNING

TURN THE HOT WATER T

Next: &1082, ?1042, ?1044, ?1553

OBSERVATION MAINS LED ILLUMINATED

SELECTOR SWITCH IN CH AND DHW POSITION

Next: &1041, ?1068, ?1070

DHW PUMP RUNS

SELECTOR SWITCH TO D

Next: &5, ?1083, ?1085

60 DEGREE LIGHT

Next: &nff, f1110

HEADER FOR FUSE INVESTIGATION

Next: &nff, f1577

SETTING THE MULTIMETER TO DIODE TEST

THE IMAGES BELOW SHO

Next: &nff, !f1599

DHW OPERATION

PIPE ASSEMBLY - BYPASS

Next: End

NO POWER TO EXTERNAL CONTROLS2

Next: End

CH IGNITION NO IGNITION TIMER LINK2

PCB

Next: End

CH IGNITION2

TIMER LINK (NO CLOCK)

Next: End

NO CLOCK IN VOLTS2

PCB

Next: End

NO IGNITION2

TIMER (CLOCK)

Next: End

DHW PUMP RUNS

DIAPHRAGM - DHW/DIFF

Next: End

DHW PUMP RUNS

PIPE - POSITIVE / NEGATIVE PRESSURE

Next: End

DHW VENTURI

HYDRAULIC VENTURI ASSEMBLY

Next: End

DHW DEMAND ENDS

CABLE - LOW VOLTAGE

Next: End

DHW PUMP RUNS

DIAPHRAGM - PRESSURE

Next: End

DHW PUMP RUNS

SENSOR - TEMPERATURE

Next: End

DHW PUMP RUNS

SWITCH - SELECTOR

Next: End

FAULT CODE 60

SYSTEM PRESSURE

Next: End

FAULT CODE 60 LIMPET

PUMP

Next: End

FAULT CODE 60

CABLE - LOW VOLTAGE

Next: End

DHW BURNER IGNITION

SWITCH - AIR PRESSURE

Next: End

DHW BURNER IGNITION NO SPARKING APS WIRES

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

NO SPARK

PCB

Next: End

OVERHEAT THERMOSTAT RESISTANCE

LEAD - IGNITION ELECTRODE

Next: End

NO SPARK

SPARK GAP

Next: End

DHW BURNER IGNITION

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

DHW BURNER IGNITION

FLUE

Next: End

BAFFLES OUT

FLUE

Next: End

FAULT CODE 50 FAN DOES NOT RUN

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

FAULT CODE 50 FAN DOES NOT RUN

VENTURI

Next: End

FAULT CODE 50 FAN RUNS

SWITCH - AIR PRESSURE

Next: End

FAULT CODE 50 NO SPARKING APS WIRES

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAULT CODE 50 FAN RUNS

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

FAULT CODE 60DHW BURNER IGNITION

FLUE

Next: End

OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

OVERHEAT INVESTIGATION

PUMP

Next: End

OVERHEAT INVESTIGATION

SENSOR - TEMPERATURE

Next: End

OVERHEAT INVESTIGATION

SENSOR - TEMPERATURE

Next: End

DHW MODULATING SOLENOID MODUREG RESISTANCE

GAS VALVE

Next: End

PUMP PROVING SWITCH

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED

FILTER RETURN

Next: End

GAS VALVE TOOK PCB OUT

PCB AND GAS VALVE

Next: End

BOILER AND RADS COOL

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED 2

FILTER RETURN

Next: End

BOILER TO TEMP RADS COOL

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED 3

FILTER RETURN

Next: End

PUMP PROVING 2

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED 4

FILTER RETURN

Next: End

OVERHEAT

TAP - ISOLATION - FLOW / RETURN

Next: End

FAULT CODE 50 FAN DOES NOT RUN 30 AND 50 DEGREE LIGHT

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

FAULT CODE 50 FAN DOES NOT RUN 30 AND 50 DEGREE LIGHT

VENTURI

Next: End

FAULT CODE 30 + 50

FAN

Next: End

FAN NOT RUNNING FAULT CODE

PCB LINK A10 AND A11

Next: End

NO DEMAND 2

THERMOSTAT CONTROLS

Next: End

PUMP NOT RUNNING

PCB LINK A10 AND A11

Next: End

NO DEMAND

THERMOSTAT CONTROLS

Next: End

NO PREHEAT

PCB LINK A10 AND A11

Next: End

NO PREHEAT

THERMOSTAT CONTROLS

Next: End

POOR FLOW RATE

TAP - ISOLATION - DHW INLET

Next: End

DHW FLOW RATE

FILTER - DHW

Next: End

DHW FLOW RATE

FILTER - DHW

Next: End

INSUFFICIENT

WATER SUPPLY PRESSURE

Next: End

POWER TO FAN FLUCTUATING

PCB

Next: End

DHW BURNER IGNITION BURNER DROPPING OUT

SWITCH - AIR PRESSURE

Next: End

DHW BURNER IGNITION BURNER DROPPING OUT

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

DHW BURNER IGNITION BURNER DROPPING OUT

FLUE

Next: End

AIR FLOW PROBLEM

HEAT EXCHANGER - PRIMARY

Next: End

DROPPING POWER TO FAN

PCB

Next: End

NO POWER TO EXTERNAL CONTROLS

Next: End

CH IGNITION NO IGNITION TIMER LINK

PCB

Next: End

CH IGNITION

TIMER LINK (NO CLOCK)

Next: End

NO CLOCK IN VOLTS

PCB

Next: End

NO IGNITION

TIMER (CLOCK)

Next: End

NOT RAMPING UP ON CH

SENSOR - TEMPERATURE

Next: End

NOT RAMPING UP ON CH

THERMOSTAT CONTROLS

Next: End

DHW SENSOR

CABLE - LOW VOLTAGE

Next: End

DHW FAN RUNS - HW SENSOR

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 70

CABLE - LOW VOLTAGE

Next: End

EARTH LEAKAGE

CABLE - GAS VALVE / IGNITER

Next: End

EARTH LEAKAGE 2

CABLE - GAS VALVE / IGNITER

Next: End

STUCK IN PREHEAT WHEN SHOULDNT BE

THERMOSTAT CONTROLS

Next: End

EARTH LEAKAGE 3

CABLE - GAS VALVE / IGNITER

Next: End

BLOWN

FUSE MAINS

Next: End

DHW PUMP RUNS

FUSE 2A 250V

Next: End

BLOWING FUSE

PUMP

Next: End

BLOWING FUSE

FAN

Next: End

WATER LEAK

DIVERTER VALVE BODY AND HEAD

Next: End

BLOWING FUSE

MOTOR - 3- WAY VALVE

Next: End

BLOWING FUSE

GAS VALVE

Next: End

BLOWING FUSE

CABLE - GAS VALVE / IGNITER

Next: End

BLOWING FUSE 2

CABLE - GAS VALVE / IGNITER

Next: End

BLANK FOR DIODE TEST

Z DUMMY

Next: End

SHORTED OUT RECTIFICATION

TRAP - CONDENSATE

Next: End

DHW BURNER ESTABLISHED

ELECTRODE - IGNITION

Next: End

DHW BURNER ESTABLISHED

LEAD - SENSING ELECTRODE / TRAP CONNECT

Next: End

FLAME SENSE POSITION

FLAME SENSE GAP

Next: End

RESTRICTED OR BLOCKED

SECONDARY HEAT EXCHANGER

Next: End

RESTRICTED OR BLOCKED 2

SECONDARY HEAT EXCHANGER

Next: End

OVERHEAT INVESTIGATION

GAS VALVE

Next: End

RESTRICTED OR BLOCKED 5

FILTER RETURN

Next: End

EARTH LEAKAGE 2 3

CABLE - GAS VALVE / IGNITER

Next: End

EARTH LEAKAGE 3 4

CABLE - GAS VALVE / IGNITER

Next: End

FAULT CODE 30 + 40DHW PUMP RUNS

DIAPHRAGM - DHW/DIFF

Next: End

FAULT CODE 30 + 40DHW PUMP RUNS

PIPE - POSITIVE / NEGATIVE PRESSURE

Next: End

FAULT CODE 30 + 40DHW VENTURI

HYDRAULIC VENTURI ASSEMBLY

Next: End

FAULT CODE 30 + 40EARTH LEAKAGE 2 3

CABLE - GAS VALVE / IGNITER

Next: End

FAULT CODE 30 + 40DHW DEMAND ENDS

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 80OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

FAULT CODE 80OVERHEAT

TAP - ISOLATION - FLOW / RETURN

Next: End

FAULT CODE 80 DHW DEMAND ENDS

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 80 DHW PUMP RUNS

DIAPHRAGM - DHW/DIFF

Next: End

FAULT CODE 80 DHW PUMP RUNS

PIPE - POSITIVE / NEGATIVE PRESSURE

Next: End

FAULT CODE 80 DHW VENTURI

HYDRAULIC VENTURI ASSEMBLY

Next: End

FAULT CODE 80 EARTH LEAKAGE 2 3

CABLE - GAS VALVE / IGNITER

Next: End

FAULT CODE 80OVERHEAT INVESTIGATION

PUMP

Next: End

FAULT CODE 80OVERHEAT INVESTIGATION

SENSOR - TEMPERATURE

Next: End

FAULT CODE 80RESTRICTED OR BLOCKED

SECONDARY HEAT EXCHANGER

Next: End

FAULT CODE 80OVERHEAT INVESTIGATION

GAS VALVE

Next: End

FAULT CODE 80RESTRICTED OR BLOCKED 5

FILTER RETURN

Next: End

FAULT CODE 70

SWITCH - SELECTOR

Next: End

FAULT CODE 70 - FAULTING DURING OPERATION

SENSOR - TEMPERATURE

Next: End

DHW OPERATION DHW COOL RADS HOT

CABLE - 3-WAY VALVE MOTOR

Next: End

CH OPERATION UP TO TEMP RADS COOL

CABLE - 3-WAY VALVE MOTOR

Next: End

FAULT CODE 60 - FAULT REOCCURS

PCB

Next: End

FAULT CODE 80

SWITCH - SELECTOR

Next: End

FAULT CODE 80

VALVE - 3- WAY ASSEMBLY

Next: End

FAULT CODE 80 DIVERTER

PCB

Next: End

FAULT CODE 80

CABLE - 3-WAY VALVE MOTOR

Next: End

CH NOISY DHW OK

PUMP

Next: End

CH OPERATION CH NOISY DHW OK

PIPE ASSEMBLY - BYPASS

Next: End

FAULT CODE 30 + 40

CABLE - 3-WAY VALVE MOTOR

Next: End

FAULT CODE 30 + 40

VALVE - 3- WAY ASSEMBLY

Next: End

FAULT CODE 30 + 40 DIVERTER

PCB

Next: End

DHW IGNITION

GAS VALVE COMPENSATION TUBE

Next: End

CH IGNITION

GAS VALVE COMPENSATION TUBE

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

OVERHEAT INVESTIGATION

THERMOSTAT - OVERHEAT FLUE

Next: End

DHW FAN RUNS

THERMOSTAT - LIMIT

Next: End

EARTH LEAKAGE 6

CABLE - GAS VALVE / IGNITER

Next: End

PUMP OVERRUNS

PCB

Next: End

BURNER PRESSURE EXC

GAS VALVE COMPENSATION TUBE

Next: End

SPARK NO GAS

GAS VALVE COMPENSATION TUBE

Next: End

FAN RUNS THEN STOPS

THERMOSTAT - OVERHEAT FLUE

Next: End

FAULT CODE 30 AND 40

THERMOSTAT - OVERHEAT FLUE

Next: End

CH OPERATION FIRES WITH NO DEMAND

SENSOR - TEMPERATURE

Next: End

DHW MODULATION

SENSOR - TEMPERATURE

Next: End

CH MODULATION

SENSOR - TEMPERATURE

Next: End

DHW FAN RUNS

PIPE - PRESSURE SWITCH - POSITIVE / NEGATIVE

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

PCB

Next: End

CH OPERATION

VALVE - 3- WAY ASSEMBLY

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

PUMP

Next: End

DHW FAN RUNS

VENTURI

Next: End

CHOICE OF DIAGNOSTICS

Z DUMMY

Next: End

FAULT CODES PAGE

Z DUMMY

Next: End

FAULT CODE 80

SENSOR - TEMPERATURE

Next: End

FAULT CODE 30AND40

THERMOSTAT - LIMIT

Next: End

DHW BURNER IGNITION

GAS INLET PRESSURE

Next: End

BURNER IGNITION PRESSURE LOW OR DIES OUT

GAS INLET PRESSURE

Next: End

BURNER IGNITES BUT BAFFLES OUT

GAS INLET PRESSURE

Next: End

BAFFLES OUT

TRAP - CONDENSATE

Next: End

BAFFLES OUT

HEAT EXCHANGER - PRIMARY

Next: End

CH OPERATION

SENSOR - TEMPERATURE

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PCB

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PUMP

Next: End

FAN DOES NOT RUN

SENSOR - TEMPERATURE

Next: End

CH SPINDLE NOT MAKING

SYSTEM PRESSURE

Next: End

FAN DOES NOT RUN

PUMP

Next: End

DHW FAN RUNS

CABLE - LOW VOLTAGE

Next: End

FAN NOT RUNNING

SWITCH - SELECTOR

Next: End

DHW BURNER ESTABLISHED

SENSOR - TEMPERATURE

Next: End

LOW BURNER PRESSURE

SENSOR - TEMPERATURE

Next: End

HIGH FLAME NO OUTPUT FROM IGNITION BOARD

PCB

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

SPARK GAS PRESENT NO IGNITION

SPARK GAP

Next: End

DHW TEMPERATURE LOW RADIATORS HOT

PCB

Next: End

LETTING BY

PRESSURE DIFFERENTIAL ASSEMBLY

Next: End

POOR DHW

SENSOR - TEMPERATURE

Next: End

POOR DHW

THERMOSTAT CONTROLS

Next: End

DHW OPERATION

MANIFOLD - BURNER

Next: End

HEAT EXCHANGER PRIMARY

HEAT EXCHANGER - PRIMARY

Next: End

CH IGNITION2

EXT CONTROLS / LINK

Next: End

CH IGNITION 22

PCB

Next: End

NO IGNITION CLOCK OK2

PCB

Next: End

NO DHW DEMAND

CABLE - LOW VOLTAGE

Next: End

DHW PUMP RUNS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

DHW DEMAND ENDS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

DHW DEMAND ENDS

DIAPHRAGM - DHW/DIFF

Next: End

SERVICE KIT

VALVE - DIFFERENTIAL - DHW

Next: End

NOT RECOGNISING DHW DEMAND

PCB

Next: End

MAINS LED NOT ILLUMINATED

PCB

Next: End

SELECTOR SWITCH

SWITCH - SELECTOR

Next: End

DHW PUMP RUNS

CABLE - PCB INPUT

Next: End

DHW PUMP RUNS

PUMP

Next: End

DHW PUMP RUNS

CABLE - LOW VOLTAGE

Next: End

DHW PUMP RUNS

VALVE 3 WAY ASSEMBLY (SPINDLE)

Next: End

SENSOR CH

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 60

PUMP

Next: End

FAULT CODE 60

DIAPHRAGM - PRESSURE

Next: End

FAULT CODE 60

VALVE 3 WAY ASSEMBLY (SPINDLE)

Next: End

FAULT CODE 60

VALVE - 3- WAY ASSEMBLY

Next: End

DHW BURNER IGNITION

ELECTRODE - IGNITION

Next: End

DHW BURNER IGNITION

FAN

Next: End

DHW BURNER IGNITION

VENTURI

Next: End

NO SPARK

SECONDARY HEAT EXCHANGER

Next: End

NO SPARKING

WASHER 58 DIA - FRONT BEND

Next: End

NO SPARKING

FLUE CLAMP

Next: End

MECHANICAL 2

GAS VALVE

Next: End

FAULT 1

CABLE - GAS VALVE / IGNITER

Next: End

BAFFLES OUT

SECONDARY HEAT EXCHANGER

Next: End

FAULT CODE 50 APS N/O WIRES

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAULT CODE 50 NOT PROVING IN N/C

SWITCH - AIR PRESSURE

Next: End

FAULT CODE 50 DOES NOT RUN

FAN

Next: End

FAULT CODE 60

FAN

Next: End

FAULT CODE 50 FAN RUNS

VENTURI

Next: End

FAULT CODE 50

SECONDARY HEAT EXCHANGER

Next: End

FAULT CODE 50

WASHER 58 DIA - FRONT BEND

Next: End

FAULT CODE 50

FLUE CLAMP

Next: End

FAULT CODE 50 NO SPARK

PCB

Next: End

SPARK GENERATOR NO SPARK

CABLE - GAS VALVE / IGNITER

Next: End

DHW FAN RUNS

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

STICKING

PRESSURE DIFFERENTIAL ASSEMBLY

Next: End

FAN DOES NOT RUN

HEAT EXCHANGER - PRIMARY

Next: End

NO IGNITION NO OUTPUT FROM IGNITION BOARD

PCB

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

Next: End

FAULT CODE 60

HEAT EXCHANGER - PRIMARY

Next: End

FAULT CODE 50 APS N/O WIRES 30 AND 50 DEGREE LIGHT

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAULT CODE 50 NOT PROVING IN N/C 30 AND 50 DEGREE LIGHT

SWITCH - AIR PRESSURE

Next: End

FAULT CODE 30 + 50

PCB

Next: End

FAULT CODE 50 NO VOLTAGE TO FAN

PCB

Next: End

NO POWER TO FAN AT PREHEAT

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAN NOT RUNNING

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAULT CODE 60

PCB

Next: End

DHW PREHEAT

PCB

Next: End

DHW FLOW RATE

HEAT EXCHANGER - DHW

Next: End

DHW BURNER IGNITION BURNER DROPPING OUT

FAN

Next: End

DHW BURNER IGNITION BURNER DROPPING OUT

VENTURI

Next: End

NO SPARK BURNER DROPPING OUT

SECONDARY HEAT EXCHANGER

Next: End

NO SPARKING BURNER DROPPING OUT

WASHER 58 DIA - FRONT BEND

Next: End

NO SPARKING BURNER DROPPING OUT

FLUE CLAMP

Next: End

CH IGNITION

EXT CONTROLS / LINK

Next: End

CH IGNITION 2

PCB

Next: End

NO IGNITION CLOCK OK

PCB

Next: End

NOT RAMPING UP ON CH

PCB

Next: End

DHW PUMP RUNS

SENSOR - TEMPERATURE

Next: End

DHW FAN RUNS

SENSOR - TEMPERATURE

Next: End

FAULT CODE 70

SENSOR - TEMPERATURE

Next: End

RE-IGNITION DELAY

PCB

Next: End

NOT RE FIRING ON CH

PCB

Next: End

MAINS LED FLASHING

PCB

Next: End

EARTH LEAKAGE

GAS VALVE

Next: End

MAINS LED FLASHING 2

PCB

Next: End

EARTH LEAKAGE 2

GAS VALVE

Next: End

MAINS LED FLASHING 3

PCB

Next: End

EARTH LEAKAGE 3

GAS VALVE

Next: End

DHW PUMP RUNS

Next: End

BLANK FOR FUSE INVESTIGATION

Z DUMMY

Next: End

BLANK FOR FUSE INVESTIGATION APPLIANCE

Z DUMMY

Next: End

DHW MODULATION

PCB

Next: End

BLOWING FUSE

CABLE - SELECTOR SWITCH/PUMP

Next: End

BLOWING FUSE

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

BLOWING FUSE

CABLE - 3-WAY VALVE MOTOR

Next: End

BLOWING FUSE

PCB FUSE INVESTIGATION

Next: End

DHW BURNER ESTABLISHED

PCB

Next: End

OVERHEATING

HEAT EXCHANGER - DHW

Next: End

RESTRICTED OR BLOCKED

HEAT EXCHANGER - PRIMARY

Next: End

OVERHEATING 2

HEAT EXCHANGER - DHW

Next: End

RESTRICTED OR BLOCKED 2

HEAT EXCHANGER - PRIMARY

Next: End

OVERHEAT INVESTIGATION

OVERHEAT

Next: End

OVERHEAT INVESTIGATION

PCB

Next: End

MAINS LED FLASHING 2 3

PCB

Next: End

EARTH LEAKAGE 2 3

GAS VALVE

Next: End

MAINS LED FLASHING 3 4

PCB

Next: End

EARTH LEAKAGE 3 4

GAS VALVE

Next: End

FAULT CODE 30 + 40NO DHW DEMAND

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 30 + 40DHW PUMP RUNS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

FAULT CODE 30 + 40MAINS LED FLASHING 2 3

PCB

Next: End

FAULT CODE 30 + 40EARTH LEAKAGE 2 3

GAS VALVE

Next: End

FAULT CODE 30 + 40DHW DEMAND ENDS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

FAULT CODE 30 + 40DHW DEMAND ENDS

DIAPHRAGM - DHW/DIFF

Next: End

FAULT CODE 30 + 40SERVICE KIT

VALVE - DIFFERENTIAL - DHW

Next: End

FAULT CODE 30 + 40STICKING

PRESSURE DIFFERENTIAL ASSEMBLY

Next: End

FAULT CODE 30 + 40NOT RECOGNISING DHW DEMAND

PCB

Next: End

FAULT CODE 80 DHW DEMAND ENDS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

FAULT CODE 80 DHW DEMAND ENDS

DIAPHRAGM - DHW/DIFF

Next: End

FAULT CODE 80 SERVICE KIT

VALVE - DIFFERENTIAL - DHW

Next: End

FAULT CODE 80 STICKING

PRESSURE DIFFERENTIAL ASSEMBLY

Next: End

FAULT CODE 80 NOT RECOGNISING DHW DEMAND

PCB

Next: End

FAULT CODE 80 NO DHW DEMAND

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 80 DHW PUMP RUNS

VALVE - DIFFERENTIAL - DHW (SPINDLE)

Next: End

FAULT CODE 80F MAINS LED FLASHING 2 3

PCB

Next: End

FAULT CODE 80 EARTH LEAKAGE 2 3

GAS VALVE

Next: End

FAULT CODE 80OVERHEATING

HEAT EXCHANGER - DHW

Next: End

FAULT CODE 80RESTRICTED OR BLOCKED

HEAT EXCHANGER - PRIMARY

Next: End

FAULT CODE 80 NO FAULT

SENSOR - TEMPERATURE

Next: End

FAULT CODE 70

PCB

Next: End

FAULT CODE 70

Z BLANK FOR FUSE INVESTIGATION

Next: End

DHW OPERATION

MOTOR - 3- WAY VALVE

Next: End

CH OPERATION

MOTOR - 3- WAY VALVE

Next: End

FAULT CODE 60

Z BLANK FOR FUSE INVESTIGATION

Next: End

FAULT CODE 80

PCB

Next: End

FAULT CODE 80

MOTOR - 3- WAY VALVE

Next: End

FAULT CODE 30 + 40

MOTOR - 3- WAY VALVE

Next: End

TRIPPING EARLY

THERMOSTAT - LIMIT

Next: End

FAN RUNS 10 SECONDS THEN STOPS

PCB

Next: End

EARTH LEAKAGE 6

GAS VALVE

Next: End

MODUREG SET INCORRECTLY

GAS VALVE

Next: End

OVERHEAT THERMOSTAT

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAN STOPS

FLUE THERMOSTAT (RESET)

Next: End

FAULT CODE 30 + 40

CABLE - FAN / PRESSURE SWITCH OVERHEAT EXHAUST

Next: End

FAULT CODE 30 AND 40

FLUE THERMOSTAT (RESET)

Next: End

CH OPERATION FIRES WITH NO DEMAND

PCB

Next: End

CH MODULATION

PCB

Next: End

DHW FAN RUNS

FAN

Next: End

CH NOISY DHW OK

Next: End

FAULT CODE 80

CABLE - LOW VOLTAGE

Next: End

FAULT CODE 30 + 40

PCB

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

GAS VALVE

Next: End

DHW FAN RUNS - CH SENSOR

CABLE - LOW VOLTAGE

Next: End

FAN DOES NOT RUN

DIAPHRAGM - PRESSURE

Next: End

DHW FAN RUNS

VALVE 3 WAY ASSEMBLY (SPINDLE)

Next: End

FAN DOES NOT RUN

VALVE - 3- WAY ASSEMBLY

Next: End

DHW FAN RUNS

PCB

Next: End

MECHANICAL FAILURE

GAS VALVE

Next: End

DHW FAN RUNS

SWITCH - AIR PRESSURE

Next: End

DHW BURNER IGNITION

MANIFOLD - BURNER

Next: End

DHW OPERATION

VALVE - 3- WAY ASSEMBLY

Next: End

DHW TOO COOL

PCB

Next: End

DHW OPERATION

HEAT EXCHANGER - DHW

Next: End

BOILER STILL NOISY

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: p1007

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: p1010

HOT WATER LIGHT REMAINS ON WITH TAP TURNED OFF

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1043

HOT WATER LIGHT DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1045

DIAPHAGM WORN AND / OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1062

DIFFERENTIAL VALVE - STUFFING BOX LEAKING

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1064

MAINS LED FLASHING

CHARACTERISTIC TEST FROM OBSERVATION MAINS LED ILLUMINATED

Next: p1548

MAINS LED NOT ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION MAINS LED ILLUMINATED

Next: p1071

PUMP PULSES ON AND OFF

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p1562

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p1086

DIAPHRAGM SPLIT OR WORN

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1124

SPINDLE CORRODED OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1126

DIFFERENTIAL WATERWAYS BLOCKED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1128

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1167

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

Next: !p1169

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1171

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1173

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1217

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

Next: !p1219

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1221

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1223

ALL DIFFERENTIAL VALVE COMPONENTS OK

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1263

BURNER IGNITES BUT BURNER PRESSURE EXCESSIVE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p1954

BURNER IGNITES PRESSURE STARTS TO RAMP UP BUT THEN DROPS OUT AND RE IGNITES

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED

Next: p1430

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1469

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

Next: !p1471

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1473

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1475

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM CH IGNITION

Next: p1515

BURNER IGNITES BUT PRESSURE DOES NOT BEHAVE AS DESCRIBED

CHARACTERISTIC TEST FROM CH IGNITION

Next: p1919

NO RE IGNITION DELAY

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: !p1542

APPLIANCE/SYSTEM COOL, BOILER DOES NOT RE-IGNITE

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: !p1544

HOT WATER LIGHT FLASHES WITH DEMAND

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1554

BOILER AND RADIATORS ONLY GET WARM

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1285

BOILER CONTINUES TO HEAT PAST 85 DEGREES

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p1648

BOILER OVERHEATS BELOW 85 DEGREES

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p1938

BOILER UP TEMPERATURE RADIATORS COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p522

CH noisy, DHW OK

CHARACTERISTIC TEST FROM CH OPERATION

Next: p168

HOT WATER LIGHT DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1688

HOT WATER LIGHT REMAINS ON WITH TAP TURNED OFF

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1704

DIAPHAGM WORN AND / OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1709

DIFFERENTIAL VALVE - STUFFING BOX LEAKING

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1711

ALL DIFFERENTIAL VALVE COMPONENTS OK

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1713

HOT WATER LIGHT DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1735

HOT WATER LIGHT REMAINS ON WITH TAP TURNED OFF

CHARACTERISTIC TEST FROM DHW DEMAND LIGHT

Next: p1737

DIAPHAGM WORN AND / OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1742

DIFFERENTIAL VALVE - STUFFING BOX LEAKING

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1744

ALL DIFFERENTIAL VALVE COMPONENTS OK

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p1746

Fires with no demand

CHARACTERISTIC TEST FROM CH OPERATION

Next: p338

Fan does not run

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p36

Fan runs then stops

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p744

No sparkING PRESENT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p1133

Sparking OK, ZERO OR LOW GAS PRESSURE PRESENT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p773

Sparking, GAS PRESSURE PRESENT BUT NO IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p66

DIAPHRAGM SPLIT OR WORN

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p862

SPINDLE CORRODED OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p864

DIFFERENTIAL WATERWAYS BLOCKED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p866

DHW noisy operation

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p940

PRESSURE LOW OR DIES OUT

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED

Next: p782

DHW temperature low, radiators cold

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p942

DHW temperature low, radiators hot

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p944

Burner ignites but baffles out

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED

Next: p791

BURNER IGNITES, SPARK CONTINUES, BOILER GOES TO LOCKOUT

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED

Next: p1600

03/07/2018 15:37:20 1806_1_50_1 20/07/2018 13:57:17

06/07/2018 11:10:45

Next: End

VOLTAGE TO EXTERNAL CONTROLS (FROM BOILER)

{GAINPCBACS}
SELE

Next: !p1013, !f1014

TIMER LINK IN VOLTS INPUT

SELECTOR SWITCH TO D

Next: p1017, !f1018

OBSERVATION BOILER RESET

ENSURE APPLIANCE IS COOL
DHW TEMPERATURE SELECTOR SET TO MAX

Next: p1244, f675

DHW DEMAND

REMOVE DHW MICRO SWITCH HEAD

Next: !p1048, f1049

DHW DIAPHRAGM

BOILER HOT WATER CIRCUIT DRAINED AND DISCHARGED

Next: p1050, !f1051

INSPECTION DIFFERENTIAL VALVE DHW

ISOLATE DHW COLD FEED TO BOILER
DRAIN DHW SYSTEM
REMOVE DHW DIFFERENTIAL VALVE FROM BOILER

Next: !p1060, ?1061, ?1063, ?1262

MAINS POWER SUPPLY

Next: p1074, f1568

FUSE (2 AMP) RESISTANCE

REMOVE FUSE AND HOLDER LOCATED IN THE MAIN TERMINAL BLOCK

Next: !p1078, f1573

PUMP PROVING MICRO SWITCH OPEN CIRCUIT

DISCONNECT CONNECTOR A5 FROM THE PCB

Next: p1089, f1090

PUMP PROVING SPINDLE RETRACTED

SELECTOR SWITCH IN OFF POSITION
REMOVE PUMP PROVING MICRO SWITCH

Next: !p1091, f1092

CH DIAPHRAGM

BOILER DRAINED AND DISCHARGED

Next: !p1093, !f1094

RESISTANCE HARNESS DHW

REMOVE CONNECTOR A5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1535, !f1534

CH SENSOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: !p1101, !f1102

OBSERVATION PUMP RUNS PREHEAT

SELECTOR SWITCH TO D

Next: p1111, f1112

VOLTAGE PUMP PREHEAT

{GAINPCBACS}
SELECTOR SWITCH TO DHW POSITION
DHW TEMPERATURE SELECTOR TO MAX

Next: !p1113, f1403

SYSTEM WATER PRESSURE

Next: p1307, !f1118

RESISTANCE HARNESS APS (N/O)

{GAINPCBACS}
DISCONNECT A2 FROM THE PCB
DISCONNECT THE BLUE WIRE FROM THE APS

Next: p1138, !f1139

VOLTAGE SUPPLY TO SPARK GENERATOR

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO MAXIMUM

Next: p1142, !f1143

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO MAXIMUM

Next: !p1177, f1282

OBSERVATION FAN RUNS PREHEAT

SELECTOR SWITCH TO DHW POSITION
DHW PREHEAT SELECTOR TO MAX POSITION

Next: p1488, f1184

OPERATION AIR PRESSURE SWITCH

REMOVE CONNECTOR A2 FROM THE PCB

Next: p1185, f1186

RESISTANCE APS AT APS

DISCONNECT THE BLUE LEAD FROM THE AIR PRESSURE SWITCH

Next: !p1187, f1188

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p1189, !f1190

RESISTANCE HARNESS APS (N/O)

{GAINPCBACS}
DISCONNECT A2 FROM THE PCB
DISCONNECT THE BLUE WIRE FROM THE APS

Next: !p1225, !f1201

RESISTANCE APS AT APS

DISCONNECT THE BLUE LEAD FROM THE AIR PRESSURE SWITCH

Next: !p1239, f40

RESISTANCE GAS VALVE

DISCONNECT CONNECTOR PLUG FROM GAS VALVE

Next: !p1283, !f1284

RESISTANCE AIR PRESSURE SWITCH & HARNESS (NC)

REMOVE CONNECTOR A2 FROM THE PCB

Next: p1354, f1345

RESISTANCE APS AT APS (NC)

DISCONNECT THE LEADS FROM THE AIR PRESSURE SWITCH, MAKE A NOTE OF CONNECTIONS

Next: !p1346, f1347

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p1348, !f1349

INSPECTION PCB LINK A10 AND A11

{GAINPCBACS}

Next: p1359, !f1360

VOLTAGE FAN AT PCB PREHEAT

{GAINPCBACS}
DHW PREHEAT SELECTOR TO MAX POSITION
ENSURE APPLIANCE IS COOL

Next: !p1369, f1358

VOLTAGE FAN AT PCB

{GAINPCBACS}
SELE

Next: !p1402, f844

INSPECTION PCB LINK A10 AND A11

{GAINPCBACS}

Next: p1404, !f1405

INSPECTION PCB LINK A10 AND A11

{GAINPCBACS}

Next: p1409, !f1410

WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p1421, !f1428

VOLTAGE TO EXTERNAL CONTROLS (FROM BOILER)

{GAINPCBACS}
SELE

Next: !p1518, !f1519

TIMER LINK IN VOLTS INPUT

SELECTOR SWITCH TO D

Next: p1522, !f1523

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1551, !f1552

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1559, !f1560

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1565, !f1566

RESISTANCE FUSE MAINS

GAIN ACCESS TO THE MAINS FUSE FOR THE APPLIANCE

Next: !p1569, f1570

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: !p158, !f350

FUSE FURTHER INVESTIGATION (MAINS)

Next: !p1571, !f1572

FUSE FURTHER INVESTIGATION (APPLIANCE)

Next: !p1574, !f1575

RESISTANCE PUMP AND HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR A4 FROM THE PCB

Next: p1578, f1579

RESISTANCE PUMP FUSE INVESTIGATION

REMOVE THE COVER FROM THE PUMP ASSEMBLY
REMOVE THE WIRES FROM THE PUMP ASSEMBLY

Next: !p1580, !f1581

RESISTANCE FAN FUSE INVESTIGATION

DISCONNECT LIVE AND NEUTRAL LEADS FROM THE FAN

Next: !p1584, !f1585

RESISTANCE DIVERTER VALVE HEAD FUSE INVESTIGATION

REMOVE ELECTRICAL CONNECTOR FROM DIVERTER VALVE HEAD

Next: !p1590, !f1591

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES AS INDICATED BY THE RED ARROWS

Next: !p1627, f1628

INSPECTION RECUPERATOR HEAT EXCHANGER WATERWAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1629, !f1630

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES AS INDICATED BY THE RED ARROWS

Next: !p1633, f1634

INSPECTION RECUPERATOR HEAT EXCHANGER WATERWAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1635, !f1636

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1656, !f1657

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1661, !f1662

DHW DEMAND

REMOVE DHW MICRO SWITCH HEAD

Next: !p1691, f1692

DHW DIAPHRAGM

BOILER HOT WATER CIRCUIT DRAINED AND DISCHARGED

Next: p1693, !f1694

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1701, !f1702

INSPECTION DIFFERENTIAL VALVE DHW

ISOLATE DHW COLD FEED TO BOILER
DRAIN DHW SYSTEM
REMOVE DHW DIFFERENTIAL VALVE FROM BOILER

Next: !p1707, ?1708, ?1710, ?1712

INSPECTION DIFFERENTIAL VALVE DHW

ISOLATE DHW COLD FEED TO BOILER
DRAIN DHW SYSTEM
REMOVE DHW DIFFERENTIAL VALVE FROM BOILER

Next: !p1740, ?1741, ?1743, ?1745

DHW DEMAND

REMOVE DHW MICRO SWITCH HEAD

Next: !p1751, f1752

DHW DIAPHRAGM

BOILER HOT WATER CIRCUIT DRAINED AND DISCHARGED

Next: p1753, !f1754

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1761, !f1762

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES AS INDICATED BY THE RED ARROWS

Next: !p1791, f1792

INSPECTION RECUPERATOR HEAT EXCHANGER WATERWAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1793, !f1794

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: !p1803, !f1804

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: !p1817, !f1818

DIVERTER VALVE VOLTAGE

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1853, !f1854

DIVERTER VALVE VOLTAGE

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1902, !f1907

OVERHEAT THERMOSTAT RESISTANCE

REMOVE MOULDED PLUG FROM OVERHEAT THERMOSTAT

Next: p1942, !f1948

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1952, !f1953

RESET FLUE THERMOSTAT

Next: !p1977, !f1978

RESET FLUE THERMOSTAT

Next: !p1983, !f1984

CH SENSOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: !p342, !f351

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p51, !f52

DIVERTER VALVE VOLTAGE

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1810, !f526

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1800, f665

RESISTANCE HARNESS DHW

REMOVE CONNECTOR A5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1538, !f1539

HEATING THERMISTOR AND HARNESS RESISTANCE

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1719, f671

HEATING THERMISTOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: !p672, !f673

OVERHEAT AND FLUE THERMOSTAT HARNESS RESISTANCE

REMOVE CONNECTOR A2 FROM THE PCB
ENSURE THE BOILER IS COOL

Next: !p676, f677

OVERHEAT THERMOSTAT RESISTANCE

REMOVE MOULDED PLUG FROM OVERHEAT THERMOSTAT

Next: p1932, !f679

CH SENSOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: p820, !f821

HEATING THERMISTOR AND HARNESS RESISTANCE

REMOVE CONNECTOR A5 FROM THE PCB

Next: p845, f846

HEATING THERMISTOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: !p847, !f848

RESISTANCE HARNESS DHW

REMOVE CONNECTOR A5 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DHW THERMISTOR

Next: !p1536, !f1537

SYSTEM WATER PRESSURE

Next: p1264, !f856

DIVERTER VALVE VOLTAGE

{GAINPCBACS}
DHW TEMPERATURE SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1807, !f950

BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p1008, !f1009

VOLTAGE FROM EXTERNAL CONTROLS (TO BOILER)

{GAINPCBACS}
SELE

Next: p1011, f1012

CLOCK FITTED

Next: p1015, f1016

CLOCK IN VOLTS INPUT

SELECTOR SWITCH TO D

Next: p1021, !f1022

TIMER LINK RESISTANCE

DISCONNECT CONNECTOR A3 FROM THE PCB

Next: !p1019, !f1020

CLOCK RESISTANCE

DISCONNECT CONNECTOR A3 FROM THE PCB
SET CLOCK TO OFF POSITION

Next: !p1023, !f1024

OPERATION DIFFERENTIAL VALVE DHW

REMOVE DHW MICRO SWITCH HEAD

Next: p1058, f1059

DHW DEMAND MICRO SWITCH OPERATION

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1653, f1047

DHW SENSING PIPES

DHW ISOLATED AND DISCHARGED

Next: p1052, !f1053

INSPECTION FILTER AND VENTURI CARTRIDGE

DHW ISOLATED, DRAINED AND DISCHARGED

Next: !p1054, !f1055

RESISTANCE DHW MICROSWITCH AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB
DHW TAPS OFF

Next: !p1065, !f1066

POWER TO CONTROL BOARD

{GAINPCBACS}
SELECTOR SWITCH TO DHW POSITION

Next: !p1072, f1073

SELECTOR SWITCH VOLTAGE

SELECTOR SWITCH TO OFF POSITION

Next: !p1076, f1077

PUMP VOLTS

{GAINPCBACS}
SELE

Next: !p1087, f1088

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1095, f1096

HEATING THERMISTOR AND HARNESS RESISTANCE

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1099, f1100

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: p1658, !f1104

PUMP PROVING SPINDLE

SELECTOR SWITCH IN O

Next: p1115, f1116

PUMP PROVING MICRO SWITCH OPERATION

REMOVE DHW MICROSWIT

Next: p1813, !f1130

PUMP LIMPET

Next: p1119, !f1120

INSPECTION CH DIFFERENTIAL VALVE

APPLIANCE DRAINED AND DISCHARGED

Next: p1320, ?1123, ?1125, ?1127

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p1134, !f1135

OBSERVATION SPARKING WITH APS PROVEN

DISCONNECT THE RIGHT HAND TUBE(+VE) FROM THE VENTURI AND CONNECT THE AIR PRESSURE SWITCH CHARGE KIT.

Next: p1136, f1137

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p1160, !f1149

SPARK GENERATOR (OUTPUT)

REMOVE THE LEAD FROM

Next: p1140, f1141

SPARK ELECTRODE GAP

REMOVE THE INNER COMBUSTION COVER TO GAIN ACCESS TO THE BURNER

Next: !p1146, !f1147

RESISTANCE ELECTRODE LEAD

REMOVE THE ELECTRODE LEAD

Next: !p1231, !f1145

INSPECTION FLUE

Next: p1161, !f1162

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p1163, ?1166, ?1168, ?1170, ?1172

VOLTAGE GAS VALVE AT GAS VALVE

{GAINPCBACS}
SELE

Next: !p1175, f1176

VOLTAGE FAN PREHEAT

DHW PREHEAT SELECTOR TO MAX POSITION
SELECTOR SWITCH TO DHW POSITION
ENSURE APPLIANCE IS COOL

Next: !p1193, f1363

VENTURI

Next: !p1191, !f1192

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p1196, !f1197

OBSERVATION SPARKING WITH APS PROVEN

DISCONNECT THE RIGHT HAND TUBE(+VE) FROM THE VENTURI AND CONNECT THE AIR PRESSURE SWITCH CHARGE KIT.

Next: p1198, f1199

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p1210, !f1211

INSPECTION FLUE

Next: p1212, !f1213

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p1214, ?1216, ?1218, ?1220, ?1222

SYSTEM WATER PRESSURE

Next: p1323, !f1246

PUMP LIMPET

Next: p1857, !f1248

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1249, !f1250

HEATING THERMISTOR AND HARNESS RESISTANCE

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1618, !f1252

RESISTANCE MODULATING SOLENOID

REMOVE THE BLACK LEADS FROM THE MODULATING SOLENOID

Next: p874, !f1261

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p855, !f1276

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1278, !f1279

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p817, !f1295

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1297, !f1298

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p527, !f1303

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1305, !f1306

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1117, !f1319

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1321, !f1322

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1663, !f1335

VENTURI

Next: !p1350, !f1351

RESISTANCE FAN

DISCONNECT LIVE AND NEUTRAL LEADS FROM THE FAN

Next: !p1355, !f1356

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: !p1361, !f1362

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: !p1406, !f1407

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: !p1411, !f1412

INSPECTION DHW INLET VALVE

Next: p1422, !f1423

DHW INLET FILTER

DHW CIRCUIT OF APPLIANCE DRAINED AND DISCHARGED

Next: p1424, !f1425

DHW FLOW RESTRICTOR/FILTER

DHW ISOLATED, DRAINED AND DISCHARGED

Next: !p1426, !f1427

VOLTAGE FAN AT PCB AIR FLOW

{GAINPCBACS}
DHW PREHEAT SELECTOR TO MAX POSITION

Next: p1432, !f1431

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p1461, !f1434

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE THE AIR PRESSURE SENSING TUBE FROM THE BOILER

Next: p1462, !f1463

INSPECTION FLUE

Next: p1476, !f1465

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p1466, ?1468, ?1470, ?1472, ?1474

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p1464, !f1487

VOLTAGE FAN AT PCB AIR FLOW

{GAINPCBACS}
DHW PREHEAT SELECTOR TO MAX POSITION

Next: p1195, !f1510

CH SENSOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: p1530, !f1532

VOLTAGE FROM EXTERNAL CONTROLS (TO BOILER)

{GAINPCBACS}
SELE

Next: p1516, f1517

CLOCK FITTED

Next: p1520, f1521

CLOCK IN VOLTS INPUT

SELECTOR SWITCH TO D

Next: p1526, !f1527

TIMER LINK RESISTANCE

DISCONNECT CONNECTOR A3 FROM THE PCB

Next: !p1524, !f1525

CLOCK RESISTANCE

DISCONNECT CONNECTOR A3 FROM THE PCB
SET CLOCK TO OFF POSITION

Next: !p1528, !f1529

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: !p1531, !f1533

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1549, f1550

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: p1556, !f1561

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1557, f1558

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1563, f1564

RESISTANCE FAN AND HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR A2 FROM THE PCB

Next: p1582, f1583

INSPECTION WATER INGRESS TO DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: p1586, !f1587

RESISTANCE DIVERTER VALVE AND HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR A8 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: p1588, f1589

RESISTANCE GAS VALVE FUSE INVESTIGATION

DISCONNECT CONNECTOR PLUG FROM GAS VALVE

Next: p1592, !f1593

DIODE TEST GAS VALVE HARNESS FUSE INVESTIGATION

REMOVE THE CONNECTOR

Next: p1594, !f1595

RESISTANCE GAS VALVE HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR A1 FROM THE PCB

Next: !p1596, !f1597

OBSERVATION RECTIFICATION TRAP DISCONNECTED

REMOVE THE WHITE WIRE FROM THE CONDENSATE TRAP ASSEMBLY AND MAKE SAFE

Next: p1611, !f1610

FLAME SENSE ELECTRODE

Next: p1612, !f1613

FLAME SENSE LEAD

Next: p1614, !f1615

FLAME SENSE GAP

REMOVE THE INNER COMBUSTION COVER TO GAIN ACCESS TO THE BURNER

Next: !p1616, !f1617

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p1637, f1626

PRESSURE BURNER MAXIMUM AND MINIMUM

ATTACH PRESSURE GAUG

Next: p1639, !f1638

OBSERVATION RUN BOILER UP TO TEMPERATURE

CH TEMPERATURE SELEC

Next: p1643, ?1647, ?1649

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1645, !f1644

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1654, f1655

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1659, f1660

DHW DEMAND LIGHT (OVERHEAT)

TURN THE HOT WATER T

Next: p1245, ?1687, ?1703

PUMP LIMPET TEST

Next: p187, !f188

DHW DEMAND MICRO SWITCH OPERATION

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1689, f1690

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1699, f1700

DHW SENSING PIPES

DHW ISOLATED AND DISCHARGED

Next: p1695, !f1696

INSPECTION FILTER AND VENTURI CARTRIDGE

DHW ISOLATED, DRAINED AND DISCHARGED

Next: !p1697, !f1698

OPERATION DIFFERENTIAL VALVE DHW

REMOVE DHW MICRO SWITCH HEAD

Next: p1705, f1706

RESISTANCE DHW MICROSWITCH AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB
DHW TAPS OFF

Next: !p1714, !f1715

OBSERVATION BOILER RESET (CH SENSOR)

DHW TEMPERATURE SELECTOR TO MAX

Next: p1720, f1816

SYSTEM WATER PRESSURE

Next: p1728, !f1729

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1730, !f1731

DHW DEMAND LIGHT (OVERHEAT)

TURN THE HOT WATER T

Next: p1819, ?1734, ?1736

PUMP LIMPET

Next: p1763, !f1764

DHW DEMAND MICRO SWITCH OPERATION

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1749, f1750

OPERATION DIFFERENTIAL VALVE DHW

REMOVE DHW MICRO SWITCH HEAD

Next: p1738, f1739

RESISTANCE DHW MICROSWITCH AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB
DHW TAPS OFF

Next: !p1747, !f1748

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1759, f1760

DHW SENSING PIPES

DHW ISOLATED AND DISCHARGED

Next: p1755, !f1756

INSPECTION FILTER AND VENTURI CARTRIDGE

DHW ISOLATED, DRAINED AND DISCHARGED

Next: !p1757, !f1758

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1788, !f1766

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p1789, f1790

PRESSURE BURNER MAXIMUM AND MINIMUM

ATTACH PRESSURE GAUG

Next: p1795, !f1796

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1799, !f1798

OBSERVATION BOILER RESET (DHW SENSOR)

Next: p1801, f1802

OBSERVATION RUN BOILER ON DHW

DHW TEMPERATURE SELECTOR TO MAX

Next: !p1805, !f1806

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR A8 FROM THE PCB
DISCONNECT PLUG FROM DIVERTER VALVE

Next: !p1808, !f1809

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR A8 FROM THE PCB
DISCONNECT PLUG FROM DIVERTER VALVE

Next: !p1811, !f1812

OBSERVATION BOILER OPERATION (60 DEGREE)

DHW TEMPERATURE SELECTOR TO MAX

Next: !p1814, !f1815

DIVERTER VALVE HEAD

PREHEAT SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1835, f1852

DIVERTER VALVE BODY

REMOVE DIVERTER VALVE HEAD

Next: p1732, !f1851

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR A8 FROM THE PCB
DISCONNECT PLUG FROM DIVERTER VALVE

Next: !p1855, !f1856

DIVERTER VALVE HEAD

PREHEAT SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p1879, f1901

BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p414, !f190

DIVERTER VALVE BODY

REMOVE DIVERTER VALVE HEAD

Next: p1247, !f1906

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR A8 FROM THE PCB
DISCONNECT PLUG FROM DIVERTER VALVE

Next: !p1904, !f1905

INSPECTION COMPENSATION PIPE

Next: p871, !f1918

INSPECTION COMPENSATION PIPE

Next: p1514, !f1925

FLUE THERMOSTAT RESISTANCE

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1981, f1982

FLUE THERMOSTAT RESISTANCE - OPERATION

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1939, !f1940

FLUE THERMOSTAT RESISTANCE

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1973, f1976

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1950, f1951

INSPECTION COMPENSATION PIPE

Next: !p1955, !f1960

INSPECTION COMPENSATION PIPE

Next: p1174, !f1972

CH SENSOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: !p339, !f340

OPERATION AIR PRESSURE SWITCH

REMOVE CONNECTOR A2 FROM THE PCB

Next: p39, f1233

FAN VOLTS

SELECTOR SWITCH TO O

Next: !p41, f1370

VENTURI

Next: !p909, !f54

DIVERTER VALVE HEAD

PREHEAT SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: p523, f524

DIVERTER VALVE BODY

REMOVE DIVERTER VALVE HEAD

Next: p1299, !f528

PUMP LIMPET TEST

Next: p1304, !f530

SPARK ELECTRODE GAP

REMOVE THE INNER COMBUSTION COVER TO GAIN ACCESS TO THE BURNER

Next: !p92, !f93

OVERHEAT AND FLUE THERMOSTAT HARNESS RESISTANCE

REMOVE CONNECTOR A2 FROM THE PCB
ENSURE THE BOILER IS COOL

Next: p1949, f1941

GAS INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p1964, !f775

GAS INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p1908, !f784

GAS INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p792, !f793

CONDENSATE TRAP CLEAR

REMOVE THE CONDENSATE TRAP

Next: p794, !f795

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p796, !f797

INSPECTION FLUE

Next: !p1180, !f1181

GAS RATE

Next: p818, f819

PUMP LIMPET TEST

Next: p1296, !f827

MODULATING SOLENOID VOLTAGE

SELECTOR SWITCH TO D

Next: !p822, !f823

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p849, f850

PUMP PROVING SPINDLE

SELECTOR SWITCH IN O

Next: p853, f854

PUMP PROVING MICRO SWITCH OPERATION

REMOVE DHW MICROSWIT

Next: p867, !f868

PUMP LIMPET

Next: p857, !f858

INSPECTION CH DIFFERENTIAL VALVE

APPLIANCE DRAINED AND DISCHARGED

Next: p1277, ?861, ?863, ?865

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: !p869, !f870

HEATING THERMISTOR RESISTANCE

REMOVE CONNECTOR FROM CH THERMISTOR

Next: p872, !f873

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p1257, !f875

MODULATING SOLENOID VOLTAGE

SELECTOR SWITCH TO D

Next: !p876, !f877

CH OPERATION

SELECTOR SWITCH TO D

Next: !p961, ?1003, ?1005

PRESSURE DIFFERENTIAL ASSEMBLY (NON RETURN VALVE)

SET FLOW RATE TO APP

Next: p951, !f952

DIVERTER VALVE HEAD

PREHEAT SELECTOR TO OFF POSITION
REMOVE DIVERTER VALVE HEAD

Next: !p947, f948

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p953, f1632

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR A5 FROM THE PCB

Next: p955, !f956

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: p957, !f958

INSPECTION BURNER MANIFOLD

REMOVE THE BURNER ASSEMBLY

Next: !p959, !f960

System Information

  • Total Tests: 675
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control