XSol Diagnostic System

Welcome to the XSol Diagnostic System

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

Start Diagnostic Sequence

or choose a specific test below:

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f4

POWER UP

{ONOFFSWITCHON}
NO DEMANDS

Next: &704, f6

BURNER IGNITES AND ESTABLISHES DHW DEMAND

{ONOFFSWITCHON}

Next: &251, ?92, ?94, ?96

FAN RUNS

{ONOFFSWITCHON}

Next: &89, f1070

DISPLAY REACTS TO DEMAND

{ONOFFSWITCHON}

Next: &164, f186

OPERATION CH

BOILER THERMOSTAT SET TO MAX

Next: &nff, ?191, ?193, ?195, ?197, ?199

DOES BOILER REACT TO CH DEMAND

{ONOFFSWITCHON}

Next: &190, !f726

FAULT CODES

Next: &nff, !f620

LE AND HE INVESTIGATION ALSO FOR HF

Next: &nff, f262

H1 INVESTIGATION

Next: &nff, f274

H4 INVESTIGATION

Next: &nff, f281

HN INVESTIGATION

Next: &nff, f290

FUSE FURTHER INVESTIGATION FOR PCB FUSE

Next: &nff, f315

FUSE FURTHER INVESTIGATION FOR MAINS FUSE

Next: &nff, f909

OVERHEAT FURTHER INVESTIGATION

Next: &nff, f363

BOILER ENTERS STANDBY CORRECTLY

{ONOFFSWITCHON}
ENSURE NO DEMANDS

Next: &166, f705

H3/H5 INVESTIGATION

OK TO BE BLANK

Next: &nff, f715

HB OR LB

OK TO BE BLANK

Next: &nff, !f998

DASH/DOT

OK TO BE BLANK

Next: &nff, f1017

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1270

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f1272

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK-HEADER FOR QADAI

Next: &nff, f1274

HEADER FOR QADAI FLUE SENSOR

INTENTIONALLY BLANK-HEADER FOR QADAI

Next: &nff, f1278

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK-HEADER FOR QADAI

Next: &nff, f1282

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK-HEADER FOR QADAI

Next: &nff, f1286

HEADER FOR QADAI FAN RESISTANCE

INTENTIONALLY BLANK-HEADER FOR QADAI

Next: &nff, f1291

BURNER IGNITES BUT BAFFLES

TRAP AND SEAL

Next: End

DASH/DOT FAULT CODE

USER CONTROLS

Next: End

BURNER BAFFLES

HEAT EXCHANGER PRIMARY

Next: End

BOILER DOES NOT REACT TO DHW

Next: End

BAFFLES OR LIFTS OFF

BURNER INJECTOR

Next: End

CALIBBRATION

THERMISTOR - BOILER CONTROL

Next: End

FAN NOT RUNNING

DRY FIRE SENSOR

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

FAN DOES NOT RUN

DRY FIRE SENSOR

Next: End

FAN DOES NOT RUN

THERMISTOR - BOILER CONTROL

Next: End

SPARKING NOT LIGHTING

BURNER

Next: End

BOCKED OR DAMAGED SPARKING OCCURS BURNER DOESNOT IGNITE

BURNER INJECTOR

Next: End

NO SWITCHED LIVE AT STARTUP

Next: End

BLOWN STANDBY MODE AT POWER UP WITH DISPLAY BOARD

FUSE MAIN PCB

Next: End

ON/OFF SWITCH WITH HARNESS

MAINS SWITCH

Next: End

POWER UP BLANK DISPLAY

PCB AND FAN

Next: End

NO DISPLAY

PCB AND FAN

Next: End

BLANK DISPLAY FAN RUNS

PCB

Next: End

DISPLAY BOARD POWER UP 2

PCB

Next: End

POWER UP FAN RUNS WITH DEMAND AT POWER UP

USER CONTROLS

Next: End

BLANK DISPLAY FAN RUNS

USER CONTROLS

Next: End

STOPPING DEMAND

FAN

Next: End

STOPPING FAN DEMAND

HARNESS MAIN

Next: End

FAN DAMAGED PCB

PCB AND FAN

Next: End

FAN DAMAGED PCB 2

PCB AND FAN

Next: End

FAN DAMAGED PCB 3

PCB AND FAN

Next: End

FAN DAMAGED PCB 4

PCB AND FAN

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

FAN DOES NOT RUN 1

HARNESS - FAN

Next: End

FAN DOES NOT RUN 3

HARNESS - FAN

Next: End

NO PERMANENT POWER TO FAN

HARNESS - FAN

Next: End

NO POWER TO FAN

HARNESS - FAN

Next: End

BLOWN STAND BY MODE AT POWER UP WITH DISPLAY BOARD

MAIN FUSE FUSED SPUR F1

Next: End

LE FAULT CODE

SENSORS

Next: End

NEW MODELDAMAGED

ELECTRODE - IGNITION

Next: End

NEW MODELDAMAGED

LEAD - IGNITION

Next: End

NO SPARKING

ELECTRODE - IGNITION

Next: End

NO SPARKING

LEAD - IGNITION

Next: End

BURNER DOES NOT IGNITE

GAS VALVE

Next: End

FAN RUNS NO SPARK 2

HARNESS MAIN

Next: End

FAN RUNS NO SPARK 3

HARNESS MAIN

Next: End

H1 INVESTIGATION2

THERMISTOR - BOILER CONTROL

Next: End

OVERHEAT INVESTIGATION

DRY FIRE SENSOR

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION

Next: End

BLANK FOR QADAI

Z DIRECTION

Next: End

QADAI

THERMISTOR - BOILER CONTROL

Next: End

QADAI

DRY FIRE SENSOR

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO POWER TO GAS VALVE

PCB

Next: End

QADAI 2

FAN

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS PRESSURE INLET

Next: End

CH CONTROL

USER CONTROLS

Next: End

PUMP NOT RUNNING

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY

Next: End

JUMPER SETTINGS

PCB JUMPER SETTINGS

Next: End

BURNER INJECTOR

BURNER INJECTOR

Next: End

LE AND HE INVESTIGATION

THERMOSTAT - OVERHEAT

Next: End

LE HE INVESTIGATION

ELECTRODE - FLAME DETECTION

Next: End

HE LE INVESTIGATION

LEAD DETECTION

Next: End

FAN RUNS

DRY FIRE SENSOR

Next: End

POLARITY

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT INVESTIGATION

THERMOSTAT - OVERHEAT

Next: End

OVERHEATING FAILS LIMPET

PUMP

Next: End

OVERHEATING

Next: End

NOT FILLED AND VENTED

SYSTEM CHECKS

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

TRAP AND SEAL

Next: End

FUSE BLOWING

GAS VALVE

Next: End

H1 INVESTIGATION

THERMISTOR - BOILER CONTROL

Next: End

SUPPLY FAULT AT POWER UP WITH DISPLAY BOARD

Next: End

BOILER TEMP LOW SYST TEMP LOW

THERMISTOR - BOILER CONTROL

Next: End

BOILER NOISY

THERMISTOR - BOILER CONTROL

Next: End

FOR FAULT CODES PAGE

DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT INVESTIGATION

THERMISTOR - BOILER CONTROL

Next: End

OUT OF CALIBRATION

THERMOSTAT - OVERHEAT

Next: End

OVERHEATING WHEN NOT

DRY FIRE SENSOR

Next: End

BOILER NOISY

Next: End

OVERHEAT INVESTIGATION

Next: End

NOISY

SYSTEM CHECKS

Next: End

BOILER TO TEMP RADS COOL

PUMP

Next: End

CH OPERATION

Next: End

BOILER HOT RADS COLD

SYSTEM CHECKS

Next: End

FROST PROTECTION

FROST PROTECTION

Next: End

H5 INVESTIGATION

PCB JUMPER SETTINGS

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

PCB JUMPER SETTINGS

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

BURNER INJECTOR

Next: End

BOILER DOES NOT REACT TO CH

Next: End

BURNER IGNITES BUT IS NOISY

IMPULSE TUBE

Next: End

FROST PROTECTION

THERMISTOR - BOILER CONTROL

Next: End

OVERHEAT

OVERHEAT

Next: End

BURNER ESTABLISHES THEN BAFFLES

GAS PRESSURE INLET

Next: End

BURNERIGNITES

LEAD DETECTION

Next: End

BURNER IGNITES

ELECTRODE - FLAME DETECTION

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER DOES NOT ESTABLISH

TRAP AND SEAL

Next: End

DOES NOT ESTABLISH

HEAT EXCHANGER PRIMARY

Next: End

NOT ESTABLISHING

BURNER INJECTOR

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB

Next: End

OPERATION CH OK NO REFIRE

Next: End

OVERHEATING

USER CONTROLS

Next: End

FUSE BLOWING 2

GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1 2

FAN

Next: End

OPERATION OK BUT BOILER OVERHEATS

THERMOSTAT - OVERHEAT

Next: End

PCB FUSE BLOWN FOR MAINS

PCB FUSE BLOWN FOR MAINS

Next: End

FAN RUNS

THERMOSTAT - OVERHEAT

Next: End

PCB GAS VALVE

PCB GAS VALVE

Next: End

NO DROP IN GAS PRESSURE

IMPULSE TUBE

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

NOT ENOUGH FAN PRESSURE

FLUE

Next: End

BLOCKED OR DAMAGED

TRAP AND SEAL

Next: End

NO FAN PRESSURE

BURNER INJECTOR

Next: End

BLOCKED OR DAMAGED

BURNER

Next: End

FAN RUNS BURNER NOT IGNITE

ELECTRODE - IGNITION

Next: End

SPARKING NOT LIGHTING

GAS PRESSURE INLET

Next: End

BURNER BAFFLES OUT

FLUE

Next: End

HB OR LB FAULT CODE

USER CONTROLS

Next: End

DASH/DOT FAULT CODE

PCB

Next: End

BOILER DOES NOT REACT TO DHW DEMAND

HARNESS MAIN

Next: End

FAN DOES NOT RUN

HARNESS MAIN

Next: End

FAN DOES NOT RUN 2

HARNESS MAIN

Next: End

FAN

FAN

Next: End

FAN DOES NOT RUN

FAN

Next: End

FURTHER INVESTIGATION F1 WITH DISPLAY BOARD

Z DIRECTION

Next: End

FAN DOES NOT RUN 4

HARNESS MAIN

Next: End

FAN DOES NOT RUN 5

HARNESS MAIN

Next: End

INCORRECT MIX

GAS VALVE

Next: End

NO SWITCHED LIVE AT START UP

HARNESS MAIN

Next: End

FURTHER IN VESTIGATION F2 WITH DISPLAY BOARD

Z DIRECTION

Next: End

NO DISPLAY

USER CONTROLS

Next: End

DISPLAY BOARD POWER UP

PCB

Next: End

BLANK DISPLAY

USER CONTROLS

Next: End

BLANK DISPLAY

PCB

Next: End

DISPLAY BOARD FURTHER INVESTIGATION

DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATE DISPLAY BOARD PROBLEM

DIRECTION CHOICE OR CONTINUE

Next: End

NOT REACTING TO CH

PCB

Next: End

FAN DOES NOT RUN 1

PCB

Next: End

FAN DOES NOT RUN

PCB

Next: End

NO PERMANENT VOLTAGE TO FAN

PCB

Next: End

NO POWER TO FAN

PCB

Next: End

WRONG MIX

GAS VALVE

Next: End

SPARK GENERATOR

SPARK GENERATOR

Next: End

NO SPARKING 2

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

NO SPARKING

SPARK GENERATOR

Next: End

FUSE FURTHER INVESTIGATION 1

HARNESS - FAN

Next: End

FUSE FURTHER INVESTIGATION 2

HARNESS - FAN

Next: End

POWER UP BLANK DISPLAY

HARNESS - FAN

Next: End

BLANK DISPLAY

HARNESS - FAN

Next: End

FAN RUNS NO SPARK

HARNESS MAIN

Next: End

NO SPARKING

PCB - PRIMARY CONTROLS & SPARK GENERATOR

Next: End

H1 INVESTIGATION2

HARNESS MAIN

Next: End

OVERHEAT FURTHER INVESTIGATION

PCB

Next: End

OVERHEAT INVESTIGATION 2

HARNESS MAIN

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

SENSOR FLUE TEMP

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

VOLTAGE AT GAS VALVE

RESULT AS EXPECTED

Next: End

FAN RESISTANCE

RESULT AS EXPECTED

Next: End

BOOILER TO TEMP RADS COLD

PUMP

Next: End

INCORRECT GAS RATE 2

PCB

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

CH OPERATION NOISY

HEAT EXCHANGER PRIMARY

Next: End

CH OPERATION NOISEY

Next: End

HE LE FAULT CODE

PCB

Next: End

H1 INVESTIGATION

PCB

Next: End

H4 INVESTIGATION

PCB

Next: End

HN POLARITY ISSUES

PCB

Next: End

PCB FUSE BLOWN

PCB FUSE BLOWN

Next: End

H1 INVESTIGATION

HARNESS MAIN

Next: End

FUSE FURTHER INVESTIGATION

HARNESS MAIN

Next: End

H4 INVESTIGATION

HARNESS MAIN

Next: End

LE AND HE INVESTIGATION

HARNESS MAIN

Next: End

OVERHEAT INVESTIGATION 3

HARNESS MAIN

Next: End

NO MAINS POWER INTO PCB

HARNESS MAIN

Next: End

OVERHEATING WHEN NOT

PCB

Next: End

BOILER NOISY

PUMP

Next: End

OVERHEAT FURTHER INVESTIGATION

PUMP

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

H5 INVESTIGATION

PCB

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

PCB

Next: End

LOW GAS RATE BOILER AND SYSTEM COOL

PCB

Next: End

FROST PROTECTION

Next: End

FROST PROTECTION

PCB

Next: End

FROST PROTECTION

HARNESS MAIN

Next: End

FLAME SENSE

PCB

Next: End

TOO COOL BEFORE REFIRING

Next: End

FUSE FURTHER INVESTIGATION 3

HARNESS MAIN

Next: End

FUSE BLOWING

Next: End

BLANK FOR OVERHEAT STAT REPLACEMENT OR INVESTIGATION

DIRECTION CHOICE OR CONTINUE

Next: End

NO POWER TO GAS VALVE

HARNESS MAIN

Next: End

FAN RUNS SPARKING BUT NOT IGNITING

HARNESS MAIN

Next: End

NO POWER TO GAS VALVE

PCB

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT

GAS VALVE

Next: End

NO FAN PRESSURE

HEAT EXCHANGER PRIMARY

Next: End

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p640

BOILER UP TO TEMPERATURE BUT RADIATORS TOO COOL

CHARACTERISTIC TEST FROM OPERATION CH

Next: p194

BOILER AND SYSTEM TEMPERATURE TOO LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p196

OPERATION SATISFACTORY BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p924

OPERATION SATISFACTORY AND SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p200

TEMP DIFF CORRECT LOCAL BOILING

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

Next: !p248

DIFFERENTIAL OK

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

Next: !p250

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p933

BURNER CAN BE HEARD TO IGNITE BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p95

PRESSURE DOES NOT REACH 2MB

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER

Next: p948

PRESSURE REACHES 2MB BUT DOES NOT DROP WHEN VOLTAGE PRESENT

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER

Next: p950

BURNER IGNITES AND ESTABLISHES THEN BAFFLES OR IS NOISY

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p786

08/08/2022 13:16:54 2205_1_50_1 21/11/2022 09:10:27

09/11/2022 13:23:13

Next: End

FUSE FURTHER INVESTIGATION F1

Next: !p11, !f12

INSPECTION DISPLAY PCB CONNECTIONS

REMOVE THE DISPLAY PCB

Next: !p1020, !f1021

VOLTAGE SWITCHED LIVE IN AT CONNECTOR BLOCK

Next: !p1033, !f1034

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p1071, f1072

VOLTAGE PERMANENT - HALL SENSOR

ON/OFF SWITCH ON
NO DEMANDS

Next: p1073, f1074

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p1165, !f1197

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT CONNECTOR TO THE PRIMARY SENSOR AND OVERHEAT SENSOR

Next: p1079, f1080

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p1081, !f1082

RESISTANCE SENSOR FLUE OVERHEAT SENSOR

REMOVE THE CONNECTOR FROM THE OVERHEAT SENSOR

Next: !p1085, !f1086

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p1158, !f1195

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT CONNECTOR TO THE PRIMARY SENSOR AND OVERHEAT SENSOR

Next: p1097, f1098

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p1103, !f1104

RESISTANCE SENSOR FLUE OVERHEAT SENSOR

REMOVE THE CONNECTOR FROM THE OVERHEAT SENSOR

Next: !p1101, !f1102

VOLTAGE SWITCHED LIVE IN

Next: p1117, f1118

VOLTAGE SWITCHED LIVE IN AT CONNECTOR BLOCK

Next: !p1119, !f1120

FUSE FURTHER INVESTIGATION F2

Next: !p1123, !f1124

VOLTAGE DISPLAY BOARD (AT CONTROL PCB)

{ONOFFSWITCHON}
DISCONNECT USER CONTROL FROM THE MAIN PCB

Next: !p1129, f1130

RESISTANCE FAN & HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p1131, f1132

RESISTANCE OF THE FAN

DISCONNECT THE HARNESS FROM FAN

Next: !p1237, !f1134

RESISTANCE FAN & HARNESS

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p1137, f1138

RESISTANCE OF THE FAN

DISCONNECT THE HARNESS FROM FAN

Next: !p1238, !f1140

VOLTAGE DISPLAY BOARD (AT CONTROL PCB)

{ONOFFSWITCHON}
DISCONNECT USER CONTROL FROM THE MAIN PCB

Next: p1145, !f1146

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p1189, f1206

RESISTANCE SPARK GENERATOR HARNESS

REMOVE SPARK GENERATOR CONNECTOR FROM THE PCB

Next: !p1229, !f1247

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS - BLUE

REMOVE GAS VALVE CONNECTOR FROM THE PCB

Next: p1214, f1226

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEADS FROM THE GAS VALVE.

Next: !p1240, !f1239

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p1252, !f1253

RESISTANCE SENSOR FLUE OVERHEAT SENSOR

REMOVE THE CONNECTOR FROM THE OVERHEAT SENSOR

Next: !p1263, !f1264

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p1275, !f1276

RESISTANCE SENSOR FLUE OVERHEAT SENSOR

REMOVE THE CONNECTOR FROM THE OVERHEAT SENSOR

Next: !p1279, !f1280

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEADS FROM THE GAS VALVE.

Next: !p1283, !f1284

VOLTAGE GAS VALVE (AT VALVE)

{ONOFFSWITCHON}

Next: !p1288, !f1289

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1292, !f1294

VOLTAGE EXTERNAL CONTROLS (IN)

{ONOFFSWITCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1153, f1032

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p219, !f220

OBSERVATION JUMPER SETTINGS

Next: p241, !f242

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT THE CONNECTOR TO THE GAS VALVE AND OVERHEAT STAT

Next: p1199, f263

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE RED WIRES FROM THE OVERHEAT STAT

Next: !p596, !f265

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT CONNECTOR TO THE PRIMARY SENSOR AND OVERHEAT SENSOR

Next: !p278, f275

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p580, !f581

RESISTANCE SENSOR FLUE OVERHEAT (NTC) AND HARNESS

REMOVE THE CONNECTOR FOR THE OVERHEAT SENSOR FROM THE PCB

Next: !p288, f285

RESISTANCE SENSOR FLUE OVERHEAT SENSOR

REMOVE THE CONNECTOR FROM THE OVERHEAT SENSOR

Next: !p592, !f287

VOLTAGE MAINS POWER INTO APPLIANCE FOR POLARITY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p292, !f291

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS_FUSE

REMOVE GAS VALVE CONNECTOR FROM THE PCB

Next: p321, f317

RESISTANCE GAS VALVE SOLENOID MAIN_FUSE

REMOVE THE LEADS FROM THE GAS VALVE.

Next: !p588, !f508

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1236, !f325

OBSERVATION DOES THE BOILER RESET

ALLOW THE APPLIANCE TO COOL

Next: p421, f441

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT THE CONNECTOR TO THE GAS VALVE AND OVERHEAT STAT

Next: p1249, f443

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE RED WIRES FROM THE OVERHEAT STAT

Next: !p597, !f445

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p664, !f665

VOLTAGE MAINS POWER INPUT TO APPLIANCE

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p7, f8

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p662, !f663

TEMPERATURE FROST PROTECTION ACTIVE

ATTACH A TEMPERATURE PROBE TO THE FLOW PIPE

Next: p706, !f707

OBSERVATION JUMPER SETTINGS MAIN AND DISPLAY PCB

REMOVE USER DISPLAY PCB

Next: !p716, !f717

OBSERVATION JUMPER SETTINGS

Next: p722, !f721

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT CONNECTOR TO THE PRIMARY SENSOR AND OVERHEAT SENSOR

Next: !p759, f760

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: !p761, !f762

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: p601, f10

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS_FUSE

REMOVE GAS VALVE CONNECTOR FROM THE PCB

Next: p910, f911

RESISTANCE GAS VALVE SOLENOID MAIN_FUSE

REMOVE THE LEADS FROM THE GAS VALVE.

Next: !p912, !f913

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1235, !f917

VOLTAGE GAS VALVE (AT PCB)

{ONOFFSWITCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p937, f938

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT THE CONNECTOR TO THE GAS VALVE AND OVERHEAT STAT

Next: p939, f940

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE RED WIRES FROM THE OVERHEAT STAT

Next: !p941, !f942

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p989, f1181

INSPECTION PRIMARY HEAT EXCHANGER

REMOVE BURNER ASSEMBLY
REMOVE SUMP COVER ASSEMBLY

Next: p102, !f103

INSPECTION INJECTOR

Next: p1172, !f105

VOLTAGE PERMANENT HALL SENSOR

ON/OFF SWITCH ON
NO DEMANDS

Next: p1089, f1090

VOLTAGE FAN POWER AT PCB

{ONOFFSWITCHON}
REMOVE THE FAN CONNECTOR FROM THE PCB

Next: p1077, f1078

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p1087, !f1198

RESISTANCE SENSOR FLUE OVERHEAT (NTC) AND HARNESS

REMOVE THE CONNECTOR FOR THE OVERHEAT SENSOR FROM THE PCB

Next: p1168, f1084

VOLTAGE FAN AT PCB

{ONOFFSWITCHON}
G

Next: p1091, f1092

RESISTANCE FAN HARNESS

DISCONNECT THE CONNECTOR FROM THE FAN
DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p1093, !f1196

RESISTANCE SENSOR FLUE OVERHEAT (NTC) AND HARNESS

REMOVE THE CONNECTOR FOR THE OVERHEAT SENSOR FROM THE PCB

Next: p1162, f1100

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1107, !f1108

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p1141, f1144

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE FUSE HOLDER FROM PCB

Next: p1121, f1122

RESISTANCE ON/OFF SWITCH AND HARNESS

LOWER THE PCB
REM

Next: p1125, !f1126

OBSERVATION WHAT COLOUR MAIN PCB IS FITTED ?

Next: p1127, f1128

VOLTAGE AT MAIN PCB

ON/OFF SWITCH ON
DISCONNECT USER CONTROL FROM THE MAIN PCB

Next: !p1135, f1136

VOLTAGE AT MAIN PCB

ON/OFF SWITCH ON
DISCONNECT USER CONTROL FROM THE MAIN PCB

Next: p1142, !f1143

FURTHER INVESTIGATION DISPLAY BOARD PROBLEM

TESTS SO FAR INDICAT

Next: !p1149, !f1151

FURTHER INVESTIGATION DISPLAY BOARD PROBLEM

TESTS SO FAR INDICAT

Next: !p1147, !f1148

OBSERVATION DISCONNECT FAN - DEMAND RECOGNISED?

REMOVE CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1154, !f1155

OBSERVATION DISCONNECT FAN HARNESS - DEMAND RECOGNISED?

REMOVE FAN CONNECTOR FROM THE PCB

Next: !p1156, !f1157

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1160, !f1171

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1163, !f1164

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1166, !f1167

RESISTANCE FAN

DISCONNECT THE FAN CONNECTOR FROM THE FAN

Next: !p1169, !f1170

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1175, !f1174

RESISTANCE ELECTRODE SPARK

UNPLUG ELECTRODE FROM HT LEAD

Next: p1209, !f1231

INSPECTION SENSORS SECURELY FITTED

Next: p266, !f1205

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE SPARK HARNESS FROM ELECTRODE AND SPARK GENERATOR

Next: !p1232, !f1233

RESISTANCE SPARK GENERATOR HARNESS - BLUE

REMOVE SPARK GENERATOR CONNECTOR FROM THE PCB

Next: !p1243, !f1246

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE SPARK HARNESS FROM ELECTRODE AND SPARK GENERATOR

Next: !p1224, !f1225

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT CONNECTOR TO THE PRIMARY SENSOR AND OVERHEAT SENSOR

Next: p1260, f1251

RESISTANCE SENSOR FLUE OVERHEAT (NTC) AND HARNESS

REMOVE THE CONNECTOR FOR THE OVERHEAT SENSOR FROM THE PCB

Next: !p1261, f1262

PUMP LIMPET TEST

Next: p233, !f234

OBSERVATION PUMP RUNNING

Next: p694, f218

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p209, !f210

OBSERVATION DOES BOILER CONTINUE TO SHOW DEMAND

{ONOFFSWITCHON}

Next: p876, !f202

INSPECTION CONDENSATE TRAP

Next: p211, !f506

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: p213, !f617

RESISTANCE POTENTIOMETER TEMP DHW

Next: p718, !f216

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p677, !f236

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: p237, !f618

GAS RATE

Next: p239, f240

TEMPERATURE DIFFERENTIAL FLOW RETURN

Next: !p245, ?247, ?249

INSPECTION INJECTOR

Next: !p243, !f244

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM ELECTRODE
DISCONNECT FLAME SENSE LEAD FROM THE PCB

Next: p268, !f271

RESISTANCE ELECTRODE SENSE

REMOVE FLAME SENSE ELECTRODE FROM HEAT EXCHANGER

Next: !p272, !f269

RESISTANCE FAN AND HARNESS

DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: !p326, f323

OBSERVATION PUMP RUNNING

Next: p422, f466

PUMP LIMPET TEST

Next: p455, !f469

OBSERVATION SYSTEM FILLED/VENTED

Next: p621, !f471

INSPECTION EXTERNAL BYPASS

Next: p423, !f470

VOLTAGE MAINS POWER AT CONNECTOR BLOCK

{ONOFFSWITCHON}
GAIN ACCESS TO TERMINAL BLOCK

Next: !p602, !f603

OBSERVATION DOES OVERHEAT RE OCCUR

BOILER THERMOSTAT SET TO MAX

Next: p632, !f765

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE TWO RED LEADS FROM THE PRIMARY SENSOR

Next: p635, !f634

RESISTANCE OVERHEAT STAT AND HARNESS AT TEMP

Next: p884, !f637

RESISTANCE OVERHEAT SENSOR FLUE OR HEAT EX AT TEMP AND HARNESS

RUN THE APPLIANCE UNTIL THE BURNER SHUTS DOWN

Next: !p638, !f639

OBSERVATION PUMP RUNNING

Next: p192, f661

OBSERVATION SYSTEM FILLED/VENTED

Next: p235, !f693

OBSERVATION SYSTEM FILLED/VENTED

Next: p696, !f701

PUMP LIMPET TEST

Next: p697, !f698

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p699, !f700

FAN RUNS

{ONOFFSWITCHON}

Next: p1110, f1116

VOLTAGE EXTERNAL CONTROLS (IN)

{ONOFFSWITCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p757, f758

GAS RATE

Next: !p719, f720

INSPECTION INJECTOR

Next: !p724, !f723

INSPECTION IMPULSE TUBE

REMOVE IMPULSE TUBE FROM GAS VALVE AND BOILER CHASSIS

Next: p97, !f739

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p727, !f798

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM ELECTRODE
DISCONNECT FLAME SENSE LEAD FROM THE PCB

Next: p812, !f801

RESISTANCE ELECTRODE SENSE

REMOVE FLAME SENSE ELECTRODE FROM HEAT EXCHANGER

Next: p814, !f813

INSPECTION FLUE

Next: p815, !f816

INSPECTION CONDENSATE TRAP

Next: p817, !f818

INSPECTION PRIMARY HEAT EXCHANGER

REMOVE BURNER ASSEMBLY
REMOVE SUMP COVER ASSEMBLY

Next: p819, !f820

INSPECTION INJECTOR

Next: p821, !f822

INSPECTION BURNER

REMOVE THE BURNER

Next: !p823, !f824

OBSERVATION ANTI CYCLE DELAY

{ONOFFSWITCHON}
BOILER STAT SET TO 1/3 POSITION

Next: p880, !f878

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p883, !f882

RESISTANCE POTENTIOMETER TEMP DHW

Next: p636, !f888

RESISTANCE FAN AND HARNESS

DISCONNECT THE FAN HARNESS CONNECTOR FROM THE PCB

Next: p918, f915

OBSERVATION DISCONNECT MAINS TERMINAL BLOCK FUSE BLOW AGAIN

DISCONNECT THE APPLIANCE MAINS CONNECTOR
REPLACE THE MAINS FUSE

Next: !p919, !f927

OVERHEAT THERMOSTAT FURTHER INVESTIGATION

TESTS SO FAR INDICAT

Next: !p925, !f926

OBSERVATION SPARKING

REMOVE THE ELECTRODE

Next: p934, f971

VOLTAGE GAS VALVE (AT VALVE)

{ONOFFSWITCHON}

Next: p935, f936

PRESSURE GAS BURNER

CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT.

Next: p945, ?947, ?949

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEADS FROM THE GAS VALVE.

Next: !p943, !f944

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p980, !f985

INSPECTION FLUE

Next: p955, !f956

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p799, !f109

INSPECTION IMPULSE TUBE

REMOVE IMPULSE TUBE FROM GAS VALVE AND BOILER CHASSIS

Next: p951, !f952

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: !p953, !f954

INSPECTION CONDENSATE TRAP

Next: p957, !f958

INSPECTION INJECTOR

Next: p959, !f960

INSPECTION BURNER

REMOVE THE BURNER

Next: !p961, !f962

INSPECTION FLUE

Next: p98, !f99

RESISTANCE ELECTRODE SPARK

UNPLUG ELECTRODE FROM HT LEAD

Next: p1222, !f1223

INSPECTION CONDENSATE TRAP

Next: p100, !f101

RESISTANCE ELECTRODE SPARK

UNPLUG ELECTRODE FROM HT LEAD
REMOVE ELECTRODE FROM HEAT EXCHANGER

Next: p981, !f982

INSPECTION INJECTOR

Next: p1106, !f1109

VOLTAGE AT SPARK GENERATOR

USE INSULATION MAT AS REQUIRED

Next: p972, f1213

System Information

Total Tests: 403

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control