XSol Diagnostic System

WORCESTER I JUNIOR

GLOBALLY REPLACED

Next: &18, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

OVERRUN OPERATION

SELECTOR SWITCH TO CH - MAX POSITION

Next: &nff, f162

CH MODULATION

ATTACH A U-GAUGE TO

Next: &2, f159

SYSTEM PRESSURE RISE

Next: &3, !f158

CH OPERATION

ATTACH A U-GAUGE TO

Next: &4, ?148, ?150, ?152, ?559

DHW MODULATION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: &5, f143

DHW OPERATION

Next: &6, ?129, ?131, ?133, ?135

AUTO FROST PROTECTION

Next: &7, f126

DHW MAXIMUM GAS PRESSURE

Next: &199, f104

BURNER ESTABLISHES AT MINIMUM PRESSURE

ATTACH A U-GAUGE TO

Next: &10, ?86, ?88, ?90

DHW FAN RUNS

CH POTENTIOMETER SET TO MINIMUM

Next: &349, f465

DHW FLOW RATE

Next: &365, f1155

WORCESTER I JUNIOR

CASE REMOVAL<

Next: &283, !f1

CH BURNER IGNITES

SELECTOR SWITCH TO CH - MAX POSITION

Next: &8, f200

OBSERVATION BOILER STANDBY

ENSURE NO CH OR DHW DEMANDS

Next: &1153, ?932, ?934, ?936

THE APPLIANCE SEQUENCE

Next: &nff, !f287

DHW SPARKING

REMOVE INNER CASING COVER
CH POTENTIOMETER SET TO MINIMUM

Next: &423, f687

CH DEMAND PUMP RUNS

CH TEMPERATURE CONTR

Next: &14, f366

DHW BURNER IGNITES

CH POTENTIOMETER SET TO MINIMUM

Next: &nff, f402

DHW BURNER IGNITES

CH POTENTIOMETER SET TO MINIMUM

Next: &11, f424

FURTHER INVESTIGATION MELTED APS

PAGE OUTSIDE THE MODEL

Next: &nff, f549

FUSE INVESTIGATION TREE

OUTSIDE MODEL

Next: &nff, f1131

MODEL TYPE

Next: &16, !f1154

CASE OFF

Next: End

SLOW FLASH NO POWER TO EXT CONTROLS

PCB CONTROL BOARD

Next: End

SLOW FLASH NO POWER TO PUMP

PCB CONTROL BOARD

Next: End

SLOW FLASH RUNNING SLOW

PUMP AND HARNESS ASSEMBLY

Next: End

SLOW FLASH BOTH PRESSURES OUT

INLET PRESSURE

Next: End

SLOW FLASH NO POWER TO MODUREG

PCB CONTROL BOARD

Next: End

SLOW FLASH MODUREG RESISTANCE

GAS VALVE

Next: End

SLOW FLASH MAXIMUM OUT

INLET PRESSURE

Next: End

SLOW FLASH MINIMUM OUT

INLET PRESSURE

Next: End

SLOW FLASH NOT MODULATING DHW

THERMISTOR SENSOR (DHW)

Next: End

SLOW FLASH NOT MODULATING

THERMISTOR SENSOR (CH)

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

BY-PASS PIPE ASSEMBLY

Next: End

FAST FLASH FIRES WITH NO DEMAND

PCB SERVICE POTENTIOMETER

Next: End

FAST FLASH

THERMISTOR SENSOR (DHW)

Next: End

FAST FLASH

THERMISTOR SENSOR (CH)

Next: End

FAST FLASH POSITIONING

HARNESS (MAIN)

Next: End

DHW MAXIMUM GAS PRESSURE

THERMISTOR SENSOR (DHW)

Next: End

FAST FLASH INCORRECT RESISTANCE

FAN ASSEMBLY

Next: End

FAST FLASH SHORT CCT

FLOW SENSOR (VENTURI)

Next: End

FAST FLASH SHORT CCT

AIR PRESSURE SWITCH

Next: End

FAST FLASH OPEN CCT

AIR PRESSURE SWITCH

Next: End

FAST FLASH APS OPEN CCT

HARNESS (MAIN)

Next: End

DHW MAXIMUM GAS PRESSURE

DHW FLOW SWITCH

Next: End

FAST FLASH OPEN CCT

FLOW SENSOR (VENTURI)

Next: End

FAST FLASH OPEN CCT

FLUE

Next: End

BOILER STANDBY

FROST PROTECTION

Next: End

BOILER STANDBY

OPEN TAP OR LEAK

Next: End

BOILER STANDBY

Next: End

BOILER STANDBY

PROGRAMMER

Next: End

BOILER STANDBY - FROST PROTECTION

THERMISTOR SENSOR (CH)

Next: End

CH DEMAND PUMP RUNS

FUSE (MAINS)

Next: End

CH DEMAND PUMP RUN

FUSE T2A

Next: End

DHW MAXIMUM GAS PRESSURE

INLET PRESSURE

Next: End

25 AMP).CH DEMAND PUMP RUN

FUSE T1.25A

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION GAS VALVE

GAS VALVE

Next: End

FUSE INVESTIGATION

PUMP AND HARNESS ASSEMBLY

Next: End

FUSE INVESTIGATION

TRANSFORMER

Next: End

MODEL TYPE

Z REDIRECTION

Next: End

CLOSED

SERVICE VALVE

Next: End

DHW FLOW RATE

FLOW FILTER RESTRICTOR

Next: End

DHW FLOW RATE

WATER SUPPLY

Next: End

BURNER ESTABLISHES BUT BAFFLES

BURNER

Next: End

BURNER ESTABLISHES BUT BAFFLES

MAIN BURNER INJECTOR

Next: End

BURNER ESTABLISHES BUT BAFFLES

HEAT EXCHANGER (FLUE WAYS)

Next: End

BURNER ESTABLISHES BUT BAFFLES

FLUE

Next: End

DHW OPERATION

HEAT EXCHANGER (FLUE WAYS)

Next: End

DHW OPERATION

FLUE

Next: End

DHW OPERATION

MAIN BURNER INJECTOR

Next: End

DHW MODULATION

THERMISTOR SENSOR (DHW)

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

CH MODULATION

THERMISTOR SENSOR (CH)

Next: End

AUTO FROST PROTECTION

THERMISTOR SENSOR (CH)

Next: End

CH BURNER IGNITES

THERMISTOR SENSOR (CH)

Next: End

CH OPERATION

THERMISTOR SENSOR (CH)

Next: End

OVERRUN OPERATION

THERMISTOR SENSOR (CH)

Next: End

GAS VALVE 3 (RESISTANCE)

GAS VALVE

Next: End

DUMMY

APPLIANCE SEQUENCE

Next: End

EXTERNAL CONTROLS PUMP RUNS (SEND)

Next: End

BURNER IGNITES

SYSTEM PRESSURE

Next: End

BURNER IGNITES

OVERHEAT THERMOSTAT

Next: End

BURNER IGNITES

WATER PRESSURE SWITCH

Next: End

GAS VALVE 1 2 RESISTANCE999

GAS VALVE

Next: End

DHW BURNER IGNITES999

PCB CONTROL BOARD

Next: End

DHW BURNER IGNITES999

INLET PRESSURE

Next: End

DHW BURNER IGNITES999

SPARK ELECTRODE ASSEMBLY (ELECTRODES)

Next: End

BURNER IGNITES1

SYSTEM PRESSURE

Next: End

BURNER IGNITES1

OVERHEAT THERMOSTAT

Next: End

BURNER IGNITES1

WATER PRESSURE SWITCH

Next: End

GAS VALVE 1 2 RESISTANCE9991

GAS VALVE

Next: End

DHW BURNER IGNITES9991

PCB CONTROL BOARD

Next: End

DHW BURNER IGNITES9991

INLET PRESSURE

Next: End

DHW BURNER IGNITES9991

SPARK ELECTRODE ASSEMBLY (ELECTRODES)

Next: End

DHW OPERATION

FAN ASSEMBLY

Next: End

FAN RESISTANCE

FAN ASSEMBLY

Next: End

CH PUMP RUNS

TRANSFORMER

Next: End

FAN DOESNT RUN DHW FLOW SWITCH

PCB CONTROL BOARD

Next: End

MELTED APS STIFF

FAN + AIR PRESSURE SWITCH

Next: End

CH OPERATION

SYSTEM PRESSURE

Next: End

CH OPERATION

PUMP AND HARNESS ASSEMBLY

Next: End

CH MODULATIONCH OPERATION

THERMISTOR SENSOR (CH)

Next: End

CH OP LOCKOUT

BY-PASS PIPE ASSEMBLY

Next: End

MELTED APS

FAN + AIR PRESSURE SWITCH

Next: End

DHW FAN RUNS

FLOW SENSOR (VENTURI)

Next: End

DHW FAN RUNS

AIR PRESSURE SWITCH

Next: End

DHW FAN RUNS

THERMISTOR SENSOR (DHW)

Next: End

DHW FAN RUNS

THERMISTOR SENSOR (CH)

Next: End

DHW FAN RUNS

SYSTEM PRESSURE

Next: End

FAN DOES NOT RUN

OVERHEAT THERMOSTAT

Next: End

FAN NOT RUNNING

WATER PRESSURE SWITCH

Next: End

DHW BURNER IGNITES

FLOW SENSOR (VENTURI)

Next: End

DHW BURNER IGNITES

FLUE

Next: End

DHW BURNER IGNITES

AIR PRESSURE SWITCH

Next: End

DHW SPARKING

FLOW SENSOR (VENTURI)

Next: End

DHW SPARKING

FLUE

Next: End

DHW SPARKING

AIR PRESSURE SWITCH

Next: End

DHW SPARKING

SPARK ELECTRODE ASSEMBLY (LEADS)

Next: End

DHW SPARKING

SYSTEM PRESSURE

Next: End

DHW SPARKING

OVERHEAT THERMOSTAT

Next: End

DHW SPARKING

WATER PRESSURE SWITCH

Next: End

DHW SPARKING APS

HARNESS (MAIN)

Next: End

BURNER ESTABLISHES POOR CONDITION OR GAP

FLAME SENSOR ELECTRODE

Next: End

FLAME SENSE

HARNESS (MAIN)

Next: End

BURNER ESTABLISHES

BURNER

Next: End

BURNER ESTABLISHES

MAIN BURNER INJECTOR

Next: End

DHW FAN RUNS

FLOW FILTER RESTRICTOR

Next: End

AUTO FROST

PCB SERVICE POTENTIOMETER

Next: End

BURNER ESTABLISHES AT MINIMUM PRESSURE

INLET PRESSURE

Next: End

SLOW FLASH STUCK IN FAULT

SYSTEM PRESSURE

Next: End

SLOW FLASH NOT RESETTING

OVERHEAT THERMOSTAT

Next: End

SLOW FLASH

WATER PRESSURE SWITCH

Next: End

SLOW FLASH

SPARK ELECTRODE ASSEMBLY (LEADS)

Next: End

SLOW FLASH CUTTING OUT ON RAMP UP

INLET PRESSURE

Next: End

SLOW FLASH POOR CONDITION OR GAP

FLAME SENSOR ELECTRODE

Next: End

SLOW FLASH FLAME SENSE

HARNESS (MAIN)

Next: End

SLOW FLASH DOES NOT ESTABLISH

BURNER

Next: End

SLOW FLASH NOT ESTABLISHING

MAIN BURNER INJECTOR

Next: End

SLOW FLASH NOT ESTABLISHING

INLET PRESSURE

Next: End

SLOW FLASH SOLENOID DAMAGED

GAS VALVE

Next: End

SLOW FLASH NO POWER TO GAS VALVE

PCB CONTROL BOARD

Next: End

SLOW FLASH NOT IGNITING

INLET PRESSURE

Next: End

SLOW FLASH NOT IGNITING

SPARK ELECTRODE ASSEMBLY (ELECTRODES)

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

SLOW FLASH NOT RUNNING

PUMP AND HARNESS ASSEMBLY

Next: End

SLOW FLASH BOTH PRESSURES OUT

GAS VALVE

Next: End

SLOW FLASH MODUREG

HARNESS (MAIN)

Next: End

SLOW FLASH MAXIMUM OUT

GAS VALVE

Next: End

SLOW FLASH WRONG VOLTAGE TO MODUREG

PCB CONTROL BOARD

Next: End

SLOW FLASH MINIMUM OUT

GAS VALVE

Next: End

SLOW FLASH NOT MODULATING ON DHW

PCB CONTROL BOARD

Next: End

SLOW FLASH NOT MODULATING ON CH

PCB CONTROL BOARD

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

HEAT EXCHANGER

Next: End

SLOW FLASH NO FAULT

NORMAL OPERATION

Next: End

SLOW FLASH STUCK ON

PCB CONTROL BOARD

Next: End

SLOW FLASH CUTTING OUT EARLY

OVERHEAT THERMOSTAT

Next: End

FAST FLASH FIRING WITH NO DEMAND

PCB CONTROL BOARD

Next: End

FAST FLASH DHW THERMISTOR

HARNESS (MAIN)

Next: End

FAST FLASH CH THERMISTOR

HARNESS (MAIN)

Next: End

FAST FLASH STUCK IN FAULT

PCB CONTROL BOARD

Next: End

FAST FLASH NOT RUNNING WITH POWER

FAN ASSEMBLY

Next: End

FAST FLASH RESISTANCE

FAN HARNESS

Next: End

FAST FLASH NO POWER TO FAN

PCB CONTROL BOARD

Next: End

FAST FLASH APS SHORT CCT

HARNESS (MAIN)

Next: End

FAST FLASH APS SHORTED

Z REDIRECTION

Next: End

FAST FLASH APS OPEN CCT

Z REDIRECTION

Next: End

FAST FLASH NOT RECOGNISING APS SWITCHING

PCB CONTROL BOARD

Next: End

FAST FLASH RUNNING SLOW

FAN ASSEMBLY

Next: End

DHW MAXIMUM GAS PRESSURE

PCB CONTROL BOARD

Next: End

BOILER STANDBY - FROST PROTECTION

PCB CONTROL BOARD

Next: End

BOILER STANDBY - FAN RELAY

PCB CONTROL BOARD

Next: End

BOILER STANDBY - STUCK IN CH - WITH EXT CONTROLS

PCB CONTROL BOARD

Next: End

BOILER STANDBY - STUCK IN CH - NO EXT CONTROLS

PCB CONTROL BOARD

Next: End

CH DEMAND PUMP RUN

Next: End

FUSE INVESTIGATION MAINS

Z REDIRECTION

Next: End

FUSE INVESTIGATION F1

Z REDIRECTION

Next: End

FUSE INVESTIGATION F2

Z REDIRECTION

Next: End

FUSE INVESTIGATION

FAN HARNESS

Next: End

FUSE INVESTIGATION GAS VALVE

HARNESS (MAIN)

Next: End

GAS PRESSURE (INLET)

GAS VALVE

Next: End

FUSE INVESTIGATION

FUSE INVESTIGATION NO FAULT

Next: End

HEAT EXCHANGER (SECONDARY COIL)

Next: End

BURNER IGNITES, SPARK STOPS, FLAME DIES AWAY, SPARK RESTARTS

GAS VALVE

Next: End

FAN STOPPING DURING DEMAND

PCB CONTROL BOARD

Next: End

DHW BURNER IGNITES

AIR PRESSURE TUBES

Next: End

FAULTY

TEE PIECE

Next: End

DHW FAN RUNS

AIR PRESSURE TUBES

Next: End

FAULTY 2

TEE PIECE

Next: End

DHW SPARKING

AIR PRESSURE TUBES

Next: End

FAULTY 3

TEE PIECE

Next: End

FAST FLASH OPEN CCT

AIR PRESSURE TUBES

Next: End

FAULTY 4

TEE PIECE

Next: End

FAST FLASH SHORT CCT

AIR PRESSURE TUBES

Next: End

FAULTY 5

TEE PIECE

Next: End

HEAT EXCHANGER NOISY (KETTLES) DURING DHW OPERATION

HEAT EXCHANGER

Next: End

DHW OPERATION

PCB CONTROL BOARD

Next: End

DHW MODULATION

GAS VALVE

Next: End

DHW MODULATION

PCB CONTROL BOARD

Next: End

CH OPERATION

Next: End

CH OPERATION

PCB CONTROL BOARD

Next: End

OVERRUN OPERATON

PCB CONTROL BOARD

Next: End

DHW QUIET OPERATION, RADIATORS COLD

HEAT EXCHANGER

Next: End

CH MODULATION

PCB CONTROL BOARD

Next: End

CH SENSOR MODULATION

HARNESS (MAIN)

Next: End

CH SENSOR (FROST PROTECTION)

HARNESS (MAIN)

Next: End

CH SENSOR (BURNER IGNITES)

HARNESS (MAIN)

Next: End

CH SENSOR (CH OPERATION)

HARNESS (MAIN)

Next: End

CH SENSOR (OVERRUN)

HARNESS (MAIN)

Next: End

EXTERNAL CONTROLS BURNER IGNITES (RETURN)

Next: End

GAS VALVE 3

HARNESS (MAIN)

Next: End

CH DEMAND PUMP RUN

Next: End

BURNER IGNITES

HARNESS (MAIN)

Next: End

GAS VALVE 1 AND 2999

HARNESS (MAIN)

Next: End

GAS VALVE 1 2 VOLTAGE999

GAS VALVE

Next: End

DHW BURNER IGNITES999

MAIN BURNER INJECTOR

Next: End

BURNER IGNITES1

HARNESS (MAIN)

Next: End

GAS VALVE 1 AND 29991

HARNESS (MAIN)

Next: End

GAS VALVE 1 2 VOLTAGE9991

GAS VALVE

Next: End

DHW BURNER IGNITES9991

MAIN BURNER INJECTOR

Next: End

FAN DOES NOT RUN

FAN ASSEMBLY

Next: End

RESISTANCE

FAN HARNESS

Next: End

CH DEMAND PUMP RUN

PUMP AND HARNESS ASSEMBLY

Next: End

PCB CONTROL BOARD (POTENTIOMETER)

PCB CONTROL BOARD

Next: End

MELTED APS

PCB + AIR PRESSURE SWITCH

Next: End

CH MODULATIONCH OPERATION

PCB CONTROL BOARD

Next: End

CH OPERATION

HARNESS (MAIN)

Next: End

CH OP LOCKOUT

HEAT EXCHANGER

Next: End

CH OPERATION

HEAT EXCHANGER

Next: End

NO FAULT

NORMAL OPERATION

Next: End

CH OPERATION STUCK ON

PCB CONTROL BOARD

Next: End

CH OPERATION

OVERHEAT THERMOSTAT

Next: End

DHW FAN RUNS

Z REDIRECTION

Next: End

DHW THERMISTOR (DHW FAN RUNS)

HARNESS (MAIN)

Next: End

CH SENSOR (DHW FAN RUNS)

HARNESS (MAIN)

Next: End

FAN DOES NOT RUN

PCB CONTROL BOARD

Next: End

FAN NOT RUNNING

HARNESS (MAIN)

Next: End

APS (N/C)

HARNESS (MAIN)

Next: End

DHW BURNER IGNITES

Z REDIRECTION

Next: End

DHW BURNER IGNITES

FAN ASSEMBLY

Next: End

DHW SPARKING

Z REDIRECTION

Next: End

DHW SPARKING

FAN ASSEMBLY

Next: End

DHW SPARKING

SPARK ELECTRODE ASSEMBLY (ELECTRODES)

Next: End

DHW SPARKING

PCB CONTROL BOARD

Next: End

DHW SPARKING OVERHEAT

HARNESS (MAIN)

Next: End

BURNER ESTABLISHES OPEN CCT

FLAME SENSOR ELECTRODE

Next: End

PCB CONTROL BOARD (FLAME SENSE)

Next: End

DHW FAN RUNS

DHW FLOW SWITCH

Next: End

AUTO FROST PROTECTION

PCB CONTROL BOARD

Next: End

BURNER PRESSURE GOES STRAIGHT TO HIGH PRESSURE

GAS VALVE

Next: End

SLOW FLASH SAFETY CIRCUIT

HARNESS (MAIN)

Next: End

SLOW FLASH STUCK IN FAULT

PCB CONTROL BOARD

Next: End

SLOW FLASH NOT SPARKING

SPARK ELECTRODE ASSEMBLY (ELECTRODES)

Next: End

SLOW FLASH NO SPARKING

PCB CONTROL BOARD

Next: End

SLOW FLASH INCORRECT PRESSURE

GAS VALVE

Next: End

SLOW FLASH OPEN CCT

FLAME SENSOR ELECTRODE

Next: End

SLOW FLASH NOT RECOGNISING FLAME

PCB CONTROL BOARD

Next: End

SLOW FLASH CUTTING OUT

GAS VALVE

Next: End

SLOW FLASH GAS VALVE

HARNESS (MAIN)

Next: End

SLOW FLASH NOT OPENING

GAS VALVE

Next: End

SLOW FLASH NOT IGNITING

MAIN BURNER INJECTOR

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

Next: End

MINIMUM BURNER PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1008

MAXIMUM BURNER PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1010

BOTH MAXIMUM AND MINIMUM INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1012

BOILER TEMP ABOVE 85 DEGREES, BOILER STILL FIRING

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p1042

BOILER GOES TO LOCKOUT UNDER 85 DEGREES

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p1044

BOILER DOES NOT FIRE BUT FAULT CODE IMMEDIATELY REOCCURS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET FAST FLASH

Next: p1048

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET FAST FLASH

Next: p1050

FAN RUNS, PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION STANDBY OPERATION

Next: p1097

PUMP RUNS, FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION STANDBY OPERATION

Next: p1099

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1180

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1182

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1185

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1187

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1190

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1192

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1195

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1197

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1200

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE TUBES

Next: !p1202

BURNER BAFFLES OUT DURING FULL DEMAND

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p130

HEAT EXCHANGER NOISY (KETTLES) DURING DHW OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p132

DHW COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p134

DHW QUIET OPERATION, BUT PUMP RUNS AND RADIATORS HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p136

RADIATORS HEAT UP BUT HEAT EXCHANGER NOISY (KETTLES)

CHARACTERISTIC TEST FROM CH OPERATION

Next: !p590

SYSTEM DOES NOT HEAT, BUT BOILER REACHES TEMPERATURE

CHARACTERISTIC TEST FROM CH OPERATION

Next: !p151

BURNER PRESSURE DOESN'T RAMP UP, RADIATORS AND BOILER STAY COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p153

BOILER GOES TO (OVERHEAT) LOCKOUT ON CH OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p560

BOILER TEMP ABOVE 85 DEGREES, BOILER STILL FIRING

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p596

BOILER GOES TO LOCKOUT UNDER 85 DEGREES

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p598

BURNER IGNITES, SPARK STOPS, FLAME DIES AWAY, SPARK RESTARTS

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p87

BURNER FULLY CROSSLIGHTS, SPARK DOESN'T STOP, BOILER LOCKS OUT

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p753

BURNER PRESSURE GOES STRAIGHT TO HIGH PRESSURE

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: !p91

INDICATOR LIGHT FLASHING SLOW (ONCE PER SECOND)

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p938

INDICATOR LIGHT FLASHING FAST (FOUR TIMES PER SECOND)

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1045

PUMP OR FAN RUN WITH NO DEMAND (NO FAULT CODE)

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p937

APPLIANCE RESETS BUT EITHER DOES NOT IGNITE OR FLAME DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET SLOW FLASH

Next: p950

BOILER WILL NOT RESET OR RESETS AND RETURNS TO FAULT CODE

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET SLOW FLASH

Next: !p952

BURNER IGNITES, SPARK STOPS, FLAME DIES AWAY, SPARK RESTARTS

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p962

BURNER FULLY CROSSLIGHTS, SPARK DOESN'T STOP, BOILER LOCKS OUT

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p964

29/08/2018 15:11:02 1808_1_50_1 20/09/2018 11:06:18

30/08/2018 10:43:45

Next: End

GAS VALVE 3 (RESISTANCE)

REMOVE ONE OF THE BLUE WIRES ATTACHED TO THE MODULATING SOLENOID

Next: !p1019, !f1020

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p1025, !f1026

DHW THERMISTOR SENSOR (MODULATION)

Next: !p1029, !f1030

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p1033, !f1034

INSPECTION BYPASS

TURN CH FLOW AND RETURN ISOLATING VALVES OFF
DRAIN AND DISCHARGE BOILER

Next: !p1037, !f1038

DHW MODULATION VOLTAGE (FULL)

Next: p106, f105

DHW THERMISTOR SENSOR (FULL DEMAND)

REMOVE ONE YELLOW WIRE ATTACHED TO THE DHW THERMISTOR SENSOR

Next: p108, !f107

DHW THERMISTOR SENSOR (DEMAND)

REMOVE ONE YELLOW WIRE ATTACHED TO THE DHW THERMISTOR SENSOR

Next: !p1055, !f1056

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p1059, !f1060

FAN VOLTAGE

ATTACH RED CROCODILE

Next: !p1065, f1066

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR ST1 FROM PCB

Next: p1067, f1068

RESISTANCE FAN

DISCONNECT LEADS FROM FAN ASSEMBLY (NOTE CONNECTIONS FOR REINSTATEMENT).

Next: !p1069, !f1070

AIR PRESSURE SWITCH RESISTANCE (AT REST)

DISCONNECT THE RIGHT HAND GREEN WIRE FROM THE AIR PRESSURE SWITCH

Next: !p1073, f1074

AIR PRESSURE TUBES

Next: p1075, ?1199, ?1201

INFORMATION FURTHER INVESTIGATION APS

Next: !p1083, !f1084

APS HARNESS

REMOVE BOTH GREEN WIRES FROM THE AIR PRESSURE SWITCH
REMOVE THE ST16 PLUG FROM THE PCB CONNECTION

Next: !p1087, !f1088

REMOVE HEATING LINK

{GAINPCBACS}
DISCONNECT LINK BETWEEN LS AND LR ON ST2

Next: !p1116, !f1115

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p1120, f1122

FUSE FURTHER INVESTIGATION

Next: !p1123, !f1124

FUSE FURTHER INVESTIGATION

Next: !p1126, !f1127

FUSE FURTHER INVESTIGATION

Next: !p1129, !f1130

RESISTANCE FAN AND HARNESS TO EARTH

DISCONNECT CONNECTOR ST1 FROM PCB

Next: p1141, f1133

RESISTANCE FAN TO EARTH

DISCONNECT LEADS FROM FAN ASSEMBLY (NOTE CONNECTIONS FOR REINSTATEMENT).

Next: !p1134, !f1135

GAS VALVE 1 & 2 RESISTANCE TO EARTH

DISCONNECT THE CONNECTORS ON THE L/H SIDE OF THE GAS VALVE

Next: !p1138, !f1139

OBSERVATION COLD WATER SUPPLY

Next: p1156, !f1161

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p767, f234

DHW MODULATION VOLTAGE

SET DHW FLOW RATE AT

Next: !p145, f144

DHW THERMISTOR SENSOR (MODULATION)

Next: !p147, !f146

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p227, f228

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p164, f246

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p262, f237

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p230, !f229

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p236, !f235

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p239, !f238

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p241, !f242

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p248, !f247

GAS VALVE 3 (RESISTANCE)

REMOVE ONE OF THE BLUE WIRES ATTACHED TO THE MODULATING SOLENOID

Next: !p270, !f269

MAINS POWER SUPPLY

REMOVE BOTTOM FACIA PANEL

Next: p367, f1119

EXTERNAL CONTROLS (SEND LS)

REMOVE LOWER FACIA PANEL

Next: !p375, !f376

BURNER PRESSURE IGNITION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p403, f404

OVERHEAT AND SYSTEM PRESSURE AND HARNESS RESISTANCE

ENSURE APPLIANCE IS COOL

Next: p405, f406

INSPECTION SYSTEM PRESSURE

Next: p407, !f408

GAS VALVE 1 & 2 RESISTANCE

DISCONNECT THE CONNECTORS ON THE L/H SIDE OF THE GAS VALVE

Next: !p415, !f416

BURNER PRESSURE IGNITION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p425, f426

OVERHEAT AND SYSTEM PRESSURE AND HARNESS RESISTANCE

ENSURE APPLIANCE IS COOL

Next: p662, f428

INSPECTION SYSTEM PRESSURE

Next: p429, !f430

GAS VALVE 1 & 2 RESISTANCE

DISCONNECT THE CONNECTORS ON THE L/H SIDE OF THE GAS VALVE

Next: !p437, !f438

FAN VOLTAGE

ATTACH RED CROCODILE

Next: !p466, f494

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR ST1 FROM PCB

Next: p500, f496

RESISTANCE FAN

DISCONNECT LEADS FROM FAN ASSEMBLY (NOTE CONNECTIONS FOR REINSTATEMENT).

Next: !p523, !f498

TRANSFORMER RESISTANCE

REMOVE THE BACKPLATE OF THE CONTROL BOX, REMOVE THE PCB
AND THE TRANSFORMER FROM THE PCB

Next: !p535, !f536

VOLTAGE DHW FLOW SWITCH IN

{GAINPCBACS}

Next: p764, !f541

RESISTANCE FAN

DISCONNECT LEADS FROM FAN ASSEMBLY (NOTE CONNECTIONS FOR REINSTATEMENT).

Next: p555, !f599

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p578, f579

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p580, !f581

INSPECTION BYPASS

TURN CH FLOW AND RETURN ISOLATING VALVES OFF
DRAIN AND DISCHARGE BOILER

Next: !p584, !f585

AIR PRESSURE SWITCH RESISTANCE (AT REST)

DISCONNECT THE RIGHT HAND GREEN WIRE FROM THE AIR PRESSURE SWITCH

Next: !p651, f627

AIR PRESSURE TUBES

Next: p628, ?1184, ?1186

DHW THERMISTOR SENSOR (DEMAND)

REMOVE ONE YELLOW WIRE ATTACHED TO THE DHW THERMISTOR SENSOR

Next: !p637, !f638

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p641, !f642

INSPECTION SYSTEM PRESSURE

Next: p645, !f646

RESISTANCE APS WITH KIT

DISCONNECT ONE WIRE FROM THE APS

Next: p674, f683

INFORMATION FURTHER INVESTIGATION APS

Next: !p684, !f685

RESISTANCE APS WITH KIT

DISCONNECT ONE WIRE FROM THE APS

Next: p688, f689

INFORMATION FURTHER INVESTIGATION APS

Next: !p690, !f722

APS HARNESS

REMOVE BOTH GREEN WIRES FROM THE AIR PRESSURE SWITCH
REMOVE THE ST16 PLUG FROM THE PCB CONNECTION

Next: p738, !f751

SPARK LEADS RESISTANCE

REMOVE BOTH ENDS OF THE SPARK HARNESS, FROM THE ELECTRODE AND FROM THE TOP OF THE PCB

Next: p741, !f742

INSPECTION SYSTEM PRESSURE

Next: p745, !f746

HARNESS FLAME SENSE

REMOVE LOWER FACIA P

Next: !p758, !f759

INSPECTION SYSTEM PRESSURE

Next: p941, !f942

SPARK GENERATOR (OUTPUT)

CH POTENTIOMETER SET

Next: !p955, f956

SPARK LEADS RESISTANCE

REMOVE BOTH ENDS OF THE SPARK HARNESS, FROM THE ELECTRODE AND FROM THE TOP OF THE PCB

Next: !p957, !f958

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p967, !f968

HARNESS FLAME SENSE

REMOVE LOWER FACIA P

Next: !p973, !f974

GAS VALVE 1 & 2 RESISTANCE AT HARNESS

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p983, f984

GAS VALVE 1 & 2 RESISTANCE

DISCONNECT THE CONNECTORS ON THE L/H SIDE OF THE GAS VALVE

Next: !p985, !f986

EXTERNAL CONTROLS (RETURN LR)

REMOVE LOWER FACIA PANEL

Next: p997, f998

EXTERNAL CONTROLS (SEND LS)

REMOVE LOWER FACIA PANEL

Next: !p999, !f1000

PRESSURE BURNER MAX AND MIN

ATTACH U-GAUGE TO BURNER PRESSURE TEST POINT
SET SERVICE POTENTIOMETER TO MIN

Next: p1005, ?1007, ?1009, ?1011

DHW MODULATION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p1027, f1028

PRESSURE MIN SOLENOID DISCONNECTED

ATTACH U-GAUGE TO BU

Next: !p1023, f1024

VOLTAGE MODUREG (FULL)

REMOVE LOWER FACIA PANEL
SERVICE MODE POTENTIOMETER SET TO MAX

Next: p1015, !f1016

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p1013, !f1014

GAS VALVE 3 (RESISTANCE) AT HARNESS

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p1017, f1018

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p1021, !f1022

CH MODULATION

ATTACH A U-GAUGE TO

Next: p1031, f1032

DIFFERENTIAL HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO THE CH FLOW AND RETURN PIPES
CH POTENTIOMETER SET TO MAXIMUM

Next: p1035, f1036

INSPECTION LOCKOUT TEMPERATURE

ATTACH TEMPERATURE CLAMP TO CH FLOW PIPE
CH POTENTIOMETER SET TO MAX

Next: !p1039, ?1041, ?1043

OBSERVATION BOILER RESET FAST FLASH

ENSURE NO DEMANDS
CH TEMPERATURE SELECTOR SET TO MIN

Next: p1046, ?1047, ?1049

DHW FAN RUNS (FAULT CODE)

CH POTENTIOMETER SET TO MINIMUM

Next: p1063, f1064

DHW THERMISTOR SENSOR & HARNESS (DEMAND)

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p1053, f1054

INSPECTION SERVICE MODE POTENTIOMETER

{GAINPCBACS}

Next: !p1051, !f1052

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p1057, f1058

INSPECTION ST16 PLUG AND HARNESS

DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1061, !f1062

GAS VALVE 3 (RESISTANCE) AT HARNESS

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p112, f268

RESISTANCE APS WITH KIT

DISCONNECT ONE WIRE FROM THE APS

Next: p1081, f1082

RESISTANCE APS AND HARNESS (N/C)

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p1071, f1072

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p1077, !f1078

INFORMATION FURTHER INVESTIGATION APS

Next: !p1079, !f1080

VOLTAGE DHW FLOW SWITCH IN

{GAINPCBACS}

Next: !p110, !f109

OBSERVATION SPARKING WITH APS KIT

CONNECT THE AIR PRES

Next: p1085, f1086

AIR PRESSURE TUBES

Next: p1089, ?1194, ?1196

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p1091, !f1092

FLUE CHECK

Next: !p1093, !f1094

VOLTAGE EXTERNAL CONTROLS (NO DEMAND)

NO DEMANDS

Next: !p1108, !f1107

OBSERVATION DISCONNECT FLOW SENSOR

DISCONNECT THE INLINE CONNECTOR TO THE FLOW SENSOR AND MAKE SAFE

Next: !p1105, !f1104

TEMPERATURE AMBIENT

Next: p1100, !f1101

CH THERMISTOR SENSOR RESISTANCE

FROM UNDERNEATH THE APPLIANCE REMOVE THE CH THERMISTOR FROM THE PIPE

Next: !p1102, !f1117

OBSERVATION ARE EXTERNAL CONTROLS FITTED

{GAINPCBACS}

Next: p1095, f1113

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p114, !f113

GAS VALVE 1 & 2 RESISTANCE AT HARNESS TO EARTH

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p1148, f1137

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR ST15 FROM PCB

Next: p1136, !f1147

TRANSFORMER RESISTANCE

REMOVE THE BACKPLATE OF THE CONTROL BOX, REMOVE THE PCB
AND THE TRANSFORMER FROM THE PCB

Next: !p1151, !f1150

DHW ISOLATING VALVE

Next: p1157, !f1158

FLOW SENSOR (HALL SENSOR)

TURN OFF DHW INLET VALVE AND DRAIN DOWN THE DHW CIRCUIT

Next: !p1159, !f1160

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO HEAT EXCHANGER FLUEWAYS

Next: p1164, !f1169

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p1165, !f1166

INSPECTION INJECTOR

Next: p1170, !f1168

FLUE CHECK

Next: !p1171, !f1172

INSPECTION HEAT EXCHANGER

GAIN ACCESS TO HEAT EXCHANGER FLUEWAYS

Next: !p1177, !f1176

INSPECTION FAN ASSEMBLY FREE

Next: p138, !f491

INSPECTION INJECTOR

Next: !p167, !f141

FLUE CHECK

Next: p1175, !f139

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p157, f240

FUSE T2A

REMOVE BOTTOM FACIA PANEL
REMOVE FUSE SITUATED AT THE BOTTOM L/H SIDE OF THE PCB (MARKED T2A)

Next: p369, f1125

FUSE T1.25 A

REMOVE BOTTOM FACIA PANEL
REMOVE FUSE SITUATED AT THE BOTTOM CENTRE OF THE PCB (MARKED T1.25A)

Next: p371, f1128

EXTERNAL CONTROLS (RETURN LR)

REMOVE LOWER FACIA PANEL

Next: p532, f374

SPARK ELECTRODES GAP

Next: !p421, !f422

GAS VALVE 1 & 2 RESISTANCE AT HARNESS

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p413, f414

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p409, !f410

WATER PRESSURE SWITCH RESISTANCE

REMOVE BOTH LEADS FROM WATER PRESSURE SWITCH
ENSURE SYSTEM IS PRESSURISED CORRECTLY

Next: !p411, !f412

GAS VALVE 1 & 2 VOLTAGE

CH POTENTIOMETER SET TO MINIMUM
REMOVE THE PROGRAMMER COVER OR PROGRAMMER (IF FITTED)

Next: p417, !f418

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p419, !f420

SPARK ELECTRODES GAP

Next: !p443, !f444

GAS VALVE 1 & 2 RESISTANCE AT HARNESS

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p435, f436

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p431, !f432

WATER PRESSURE SWITCH RESISTANCE

REMOVE BOTH LEADS FROM WATER PRESSURE SWITCH
ENSURE SYSTEM IS PRESSURISED CORRECTLY

Next: !p433, !f434

GAS VALVE 1 & 2 VOLTAGE

CH POTENTIOMETER SET TO MINIMUM
REMOVE THE PROGRAMMER COVER OR PROGRAMMER (IF FITTED)

Next: p439, !f440

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p441, !f442

VOLTAGE DHW FLOW SWITCH OUT

{GAINPCBACS}

Next: p600, f539

PUMP VOLTAGE

SELECTOR SWITCH TO CH
REMOVE BOTTOM FACIA PANEL

Next: !p533, f534

INSPECTION FAN ASSEMBLY FREE

Next: !p557, !f558

INSPECTION SYSTEM PRESSURE

Next: p574, !f573

LIMPET TEST

Next: p576, !f575

CH MODULATION

ATTACH A U-GAUGE TO

Next: p582, f577

DIFFERENTIAL HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO THE CH FLOW AND RETURN PIPES
CH POTENTIOMETER SET TO MAXIMUM

Next: p586, f583

INSPECTION LOCKOUT TEMPERATURE

ATTACH TEMPERATURE CLAMP TO CH FLOW PIPE
CH POTENTIOMETER SET TO MAX

Next: !p594, ?595, ?597

RESISTANCE APS AND HARNESS (N/C)

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p634, f626

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p630, !f631

INFORMATION FURTHER INVESTIGATION APS

Next: !p632, !f633

DHW THERMISTOR SENSOR & HARNESS (DEMAND)

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p635, f636

CH SENSOR & HARNESS RESISTANCE

DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p639, f640

RESISTANCE SAFETY CIRCUIT

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p643, f644

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p647, !f648

WATER PRESSURE SWITCH RESISTANCE

REMOVE BOTH LEADS FROM WATER PRESSURE SWITCH
ENSURE SYSTEM IS PRESSURISED CORRECTLY

Next: !p649, !f650

OBSERVATION SPARKING WITH CASE ON

{GAINPCBACS}
DISCONNECT BOTH IGNITION LEADS FROM THE SPARK GENERATOR AND MAKE SAFE

Next: p427, f672

AIR PRESSURE TUBES

Next: p675, ?1179, ?1181

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p677, !f678

FLUE CHECK

Next: !p686, !f680

OBSERVATION SPARKING WITH APS KIT

CONNECT THE AIR PRES

Next: p692, f723

AIR PRESSURE TUBES

Next: p706, ?1189, ?1191

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p708, !f719

FLUE CHECK

Next: !p720, !f721

SPARK GENERATOR (OUTPUT)

CH POTENTIOMETER SET

Next: !p739, f740

RESISTANCE SAFETY CIRCUIT

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: !p743, f744

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p747, !f748

WATER PRESSURE SWITCH RESISTANCE

REMOVE BOTH LEADS FROM WATER PRESSURE SWITCH
ENSURE SYSTEM IS PRESSURISED CORRECTLY

Next: !p749, !f750

INSPECTION FLAME SENSE ELECTRODE

GAIN ACCESS TO FLAME SENSE ELECTRODE

Next: p754, !f755

RESISTANCE FLAME SENSE ELECTRODE AND HARNESS

DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p756, f757

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p760, !f761

INSPECTION INJECTOR

Next: !p762, !f763

FLOW SENSOR (HALL SENSOR)

TURN OFF DHW INLET VALVE AND DRAIN DOWN THE DHW CIRCUIT

Next: !p765, !f766

INSPECTION SERVICE MODE POTENTIOMETER

{GAINPCBACS}

Next: !p768, !f769

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: p1162, !f92

OBSERVATION STANDBY OPERATION

ENSURE NO DEMANDS

Next: p1109, ?1096, ?1098

RESISTANCE SAFETY CIRCUIT

REMOVE LOWER FACIA PANEL
DISCONNECT THE CONNECTOR ST16 SITUATED AT THE BOTTOM R/H SIDE OF THE PCB

Next: p939, f940

OBSERVATION BOILER RESET SLOW FLASH

Next: p947, ?949, ?951

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p943, !f944

WATER PRESSURE SWITCH RESISTANCE

REMOVE BOTH LEADS FROM WATER PRESSURE SWITCH
ENSURE SYSTEM IS PRESSURISED CORRECTLY

Next: !p945, !f946

INSPECTION SYSTEM PRESSURE

Next: p993, !f994

DHW SPARKING

REMOVE INNER CASING COVER
CH POTENTIOMETER SET TO MINIMUM

Next: p953, f954

DHW BURNER IGNITES (FAULT CODE)

CH POTENTIOMETER SET TO MINIMUM

Next: p959, ?961, ?963

BURNER PRESSURE IGNITION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p981, f982

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p979, !f980

BURNER PRESSURE IGNITION

ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p965, f966

INSPECTION FLAME SENSE ELECTRODE

GAIN ACCESS TO FLAME SENSE ELECTRODE

Next: p969, !f970

RESISTANCE FLAME SENSE ELECTRODE AND HARNESS

DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p971, f972

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p975, !f976

INSPECTION INJECTOR

Next: !p977, !f978

SPARK ELECTRODES GAP

Next: !p991, !f992

GAS VALVE 1 & 2 VOLTAGE

CH POTENTIOMETER SET TO MINIMUM
REMOVE THE PROGRAMMER COVER OR PROGRAMMER (IF FITTED)

Next: p987, !f988

GAS PRESSURE (INLET)

ATTACH A U-GAUGE TO THE GAS VALVE INLET PRESSURE TEST POINT

Next: !p989, !f990

CH DEMAND PUMP RUNS

CH TEMPERATURE CONTR

Next: p995, f996

LIMPET TEST

Next: p1003, !f1004

PUMP VOLTAGE

SELECTOR SWITCH TO CH
REMOVE BOTTOM FACIA PANEL

Next: !p1001, !f1002

Welcome to the XSol Diagnostic System