XSol Diagnostic System

DHW FLOW RATE

Next: &15, f6

DHW PUMP RUNS

Next: &39, ?501, ?503

DHW FAN RUNS

DHW SELECTOR IN MAXI

Next: &69, ?803, ?805

DHW BURNER IGNITES AND ESTABLISHES (GAS PRESSURE)

ATTACH PRESSURE GAUG

Next: &118, ?70, ?76, ?317

DHW OPERATION

Next: &163, ?119, ?121, ?123, ?125, ?843

CH OPERATION

Next: &198, ?164, ?166, ?168

EXCESSIVE SYSTEM PRESSURE RISE

Next: &200, !f199

PUMP OVERRUN

Next: &nff, !f201

POWER UP

{ALLDEMANDOFF}
BO

Next: &730, ?261, ?263

TYPE OF DIAGNOSTIC PROCEDURE

Next: &435N, !f444

LOCKOUT RESET

Next: &5, !f731

INFORMATION APPLIANCE VERSION

THIS MODEL IS ONLY A

Next: &434, !f750

INFORMATION PCB LINK

Next: &nff, !f757

F17 FAN FAULT

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f775

THE OTHER FAULT CODES ARE AT THE TOP OF MODEL - NOT SURE WHY

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, !f766

F14 FLAME SIMULATION ON THE FLAME CONTROL UNIT

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f864

F4 OVERHEAT

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f984

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1053

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1061

HEADER FOR QADAI FAN VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1065

HEADER FOR QADAI CH SENSOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1070

HEADER FOR QADAI HW SENSOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1074

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1078

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f1080

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1088

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1092

DHW SPARKING

FLUE

Next: End

POWER UP

MAINS FUSE

Next: End

PIN STUCK

DHW MICROSWITCH

Next: End

QADAI

GAS VALVE

Next: End

QADAI

CH SENSOR

Next: End

QADAI

DHW SENSOR

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION

Next: End

BLANK FOR QADAI

Z DIRECTION

Next: End

NOT ACTIVATING FLOW SWITCH

DIVERTER VALVE - 3 WAY VALVE

Next: End

QADAI 2

PUMP

Next: End

QADAI

IGNITION CONTROL BOARD

Next: End

QADAI NO POWER TO PUMP

PCB

Next: End

QADAI NO POWER OUTPUT TO FAN

PCB

Next: End

DHW OPERATION

CONDENSATE TRAP

Next: End

DHW OPERATION

FLUE

Next: End

CH OPERATION (CH NOISY)

PUMP

Next: End

CH OPERATION

CH SENSOR

Next: End

BOILER HEATS BUT RADS COLD

DIVERTER VALVE - 3 WAY VALVE

Next: End

CH OPERATION (BOILER HEATS RADS COLD)

PUMP

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

START

START

Next: End

PUMP OVERRUN

PCB

Next: End

BURNER IGNITION

OVERHEAT THERMOSTAT

Next: End

BURNER IGNITION OH STAT

PCB

Next: End

POWER UP

FUSE F1 3.15A

Next: End

POWER UP

ON/OFF SWITCH

Next: End

POWER UP

TRANSFORMER

Next: End

NO POWER OUTPUT TO FAN

PCB

Next: End

POWER UP

HARNESS FAN

Next: End

IGNITION

PCB

Next: End

NOT LIGHTING

HARNESS IGNITION PCB LOW VOLTAGE

Next: End

NOT LIGHTING

CSI120 BURNER

Next: End

BURNER IGNITES (NO IGNITION)

CONDENSATE TRAP

Next: End

FAN RUNNING CONT ON DEMAND

HARNESS IGNITION PCB LOW VOLTAGE

Next: End

NOT LIGHTING

PCB

Next: End

CLOCK

Next: End

CH POT

CH POTENTIOMETER

Next: End

PUMP RUNS

SUMMER/WINTER SWITCH

Next: End

DHW NOISY OPERATION KETTLES

SECONDARY (DHW) HEAT EXCHANGER

Next: End

DHW OPERATION (EFFICIENCY)

PUMP

Next: End

DHW OPERATION

DIVERTER VALVE - 3 WAY VALVE

Next: End

OPS PAGE

DUMMY

Next: End

FAULT FAIL

DUMMY

Next: End

PROC

DUMMY

Next: End

FAULT CODE 06

DHW SENSOR

Next: End

PUMP RUNS

SYSTEM PRESSURE

Next: End

DHW SPARKING

SPARK ELECTRODES

Next: End

DOES NOT IGNITE

CABLE - SPARK ELECTRODE

Next: End

NOT LIGHTING

PRIMARY HEAT EXCHANGER CSI120

Next: End

DV PUMP RUNS

PCB

Next: End

DHW OPERATION

CH SENSOR

Next: End

DHW OPERATION

CSI120 BURNER

Next: End

COLD TAP PASSING - DHW COLD

EXTERNAL HOT WATER FAULT

Next: End

DHW OPERATION

DHW SENSOR

Next: End

LOW VOLTS TO IGN PCB

PCB

Next: End

DHW OPERATION

GAS INLET PRESSURE

Next: End

FAULT CODE 12

CH SENSOR

Next: End

OVER HEATING - PUMP NOT RUNNING

PCB

Next: End

RUNNING NON STOP

HARNESS FAN

Next: End

FIRING WITH NO DEMAND

FLOW SWITCH - 3 WAY VALVE MICROSWITCH

Next: End

GAS PRESSURES INCORRECT

IGNITION CONTROL BOARD

Next: End

GAS VALVE (GAS PRESSURES INCORRECT)

HARNESS IGNITION

Next: End

DHW BURNER IGNITES (ELECTRICAL)

GAS VALVE

Next: End

BURNER IGNITES (ESTABLISH)

CONDENSATE TRAP

Next: End

DOES NOT ESTABLISH

CABLE FLAME SENSE

Next: End

DHW FLOW RATE FAIL

DUMMY

Next: End

LOCKOUT RESET

HARNESS PCB TO DISPLAY

Next: End

FAULT CODE RESET

DUMMY

Next: End

FAULT CODE 28

PCB

Next: End

NOT SWITCHING

TIMER - DIGITAL

Next: End

FIRING NO DEMAND

CH SENSOR

Next: End

INFORMATION APPLIANCE VERSION

DUMMY

Next: End

FAN RUNS NO DEMAND

SUMMER/WINTER SWITCH

Next: End

INFORMATION PCB LINK

DUMMY

Next: End

POWER UP

FUSE 315 MILLIAMP

Next: End

INFO

DUMMY

Next: End

F17NO POWER OUTPUT TO FAN

PCB

Next: End

F17 - NO FAN

HARNESS FAN

Next: End

F17 - FAN RUNS

HARNESS FAN

Next: End

DHW FLOW RATE

DHW ISOLATING VALVE

Next: End

F17 - FAN RUNS

FAN ASSEMBLY

Next: End

DHW FAN RUNS

FAN ASSEMBLY

Next: End

DHW FAN RUNS

HARNESS FAN

Next: End

FAN RUNS

CH SENSOR

Next: End

FAN RUNS

DHW SENSOR

Next: End

DHW POT

DHW POTENTIOMETER

Next: End

DHW TOO HOTFAN RUNS

DHW SENSOR

Next: End

DHW TOO HOT

DHW POTENTIOMETER

Next: End

F14

PCB

Next: End

F14

CABLE FLAME SENSE

Next: End

F14

ELECTRODE - SENSING

Next: End

F14

CONDENSATE TRAP

Next: End

F14 DHW BURNER IGNITES

CSI120 BURNER

Next: End

F14

MAIN HEAT EXCHANGER

Next: End

F14

FLUE

Next: End

FLUEWAYS RESTRICTED - DHW

MAIN HEAT EXCHANGER

Next: End

F28 NO FLUE STAT

HARNESS LOW VOLTAGE

Next: End

FAULT CODE 28

FLUE THERMOSTAT

Next: End

FAULT CODE 28

FUSE - THERMAL

Next: End

F4

CH SENSOR

Next: End

F4

DHW SENSOR

Next: End

F4

PCB

Next: End

POWER UP

Next: End

NO POWER TO DHW MICROSWITCH

PCB

Next: End

WORN NIPPLE

DHW MICROSWITCH

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

VOLTAGE PUMP AT PCB

RESULT AS EXPECTED

Next: End

VOLTAGE FAN AT PCB

RESULT AS EXPECTED

Next: End

RESISTANCE CH SENSOR

RESULT AS EXPECTED

Next: End

RESISTANCE HW SENSOR

RESULT AS EXPECTED

Next: End

RESISTANCE PUMP

RESULT AS EXPECTED

Next: End

VOLTAGE GAS VALVE AT PCB

RESULT AS EXPECTED

Next: End

DHW FLOW RATE

DHW INLET FILTER

Next: End

DHW OPERATION

FAN ASSEMBLY

Next: End

BLOCKED

DIVERTER VALVE - 3 WAY VALVE

Next: End

CH NOISY DHW OKAY

Next: End

BOILER HEATS BUT RADS COLD

Next: End

OVERHEAT STAT

HARNESS LOW VOLTAGE

Next: End

PCB TO IGNITION PCB (FAN RUNS CONTINUOUSLY)

HARNESS IGNITION

Next: End

POWER UP

FAN ASSEMBLY

Next: End

NOT LIGHTING

GAS INLET PRESSURE

Next: End

DOES NOT IGNITE

IGNITION CONTROL BOARD

Next: End

PCB TO IGNITION PCB (PRESSURES CORRECT)

HARNESS IGNITION

Next: End

FAN RUNS CONTINUOUSLY

IGNITION CONTROL BOARD

Next: End

OPERATION

TIMER - DIGITAL

Next: End

DHW OPERATION

PRIMARY HEAT EXCHANGER CSI120

Next: End

DHW COLD RADS HOT

SECONDARY (DHW) HEAT EXCHANGER

Next: End

CH OPERATION

Next: End

OPS PAGE PASS

DUMMY

Next: End

FAULT PASS

DUMMY

Next: End

FAULT CODE 06

PCB

Next: End

FAULT CODE 06

HARNESS LOW VOLTAGE

Next: End

NO INLET PRESSURE

GAS INLET PRESSURE

Next: End

NOT LIGHTING

FLUE

Next: End

DHW PUMP RUNS

PUMP

Next: End

DHW COLD RADIATORS COLD

SECONDARY (DHW) HEAT EXCHANGER

Next: End

DHW SENSOR HW/RADS COLD

HARNESS LOW VOLTAGE

Next: End

CH SENSOR HW/RADS COLD

HARNESS LOW VOLTAGE

Next: End

POTENITOMETER RESISTANCE CH

PCB

Next: End

FAULT CODE 12

PCB

Next: End

FAULT CODE 12

HARNESS LOW VOLTAGE

Next: End

OVER HEATING

PUMP

Next: End

DHW BURNER IGNITES (MECHANICAL)

GAS VALVE

Next: End

DROPPING OUT AFTER IGN

GAS INLET PRESSURE

Next: End

DROPS OUT INLET TOO LOW

GAS INLET PRESSURE

Next: End

DHW FLOW RATE PASS

DUMMY

Next: End

LOCKOUT RESET MECHANICAL

DIGITAL DISPLAY BOARD

Next: End

LOCKOUT RESET

PCB

Next: End

F28FIREUP

FLUE THERMOSTAT

Next: End

FAN RUNNING FULL STOP

PCB

Next: End

POWER UP

PCB

Next: End

NO OUTPUT TO TRANSFORMER

PCB

Next: End

F17 - NO FAN

FAN ASSEMBLY

Next: End

F17 - IGNORING HALL SENSOR

PCB

Next: End

POTENTIOMETER RESISTANCE DHW

PCB

Next: End

CH SENSOR FAN RUNS

HARNESS LOW VOLTAGE

Next: End

DHW SENSOR FAN RUNS

HARNESS LOW VOLTAGE

Next: End

DHW FAN RUNS

PCB

Next: End

DHW TOO HOT DHW SENSOR

HARNESS LOW VOLTAGE

Next: End

DHW TOO HOT

PCB

Next: End

SCALED

SECONDARY (DHW) HEAT EXCHANGER

Next: End

F14

IGNITION CONTROL BOARD

Next: End

DHW BURNER IGNITES

CSI120 BURNER

Next: End

DHW BURNER ESTABLISHED (FLAME SENSE)

ELECTRODE - SENSING

Next: End

DHW BURNER ESTABLISHED (FLAME SENSE)

IGNITION CONTROL BOARD

Next: End

F28 - FLUE THERMISTOR

PRESSURE SWITCH - LOW WATER

Next: End

F28 - THERMAL FUSE

PRESSURE SWITCH - LOW WATER

Next: End

F28 - FLUE STAT

PRESSURE SWITCH - LOW WATER

Next: End

F4

DUMMY

Next: End

DHW INLET FILTER BLOCKED

CHARACTERISTIC TEST FROM DIVERTER VALVE AND DHW FILTER

Next: !p12

DHW COLD, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p559

DHW COLD, RADIATORS HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p122

DHW NOISY OPERATION, KETTLES

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p124

BURNER BAFFLES OUT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p126

DIVERTER VALVE BLOCKED

CHARACTERISTIC TEST FROM DIVERTER VALVE AND DHW FILTER

Next: !p14

BOILER HEATS, BUT RADS COLD

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p165

CH NOISY, DHW OK

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p167

APPLIANCE DOES NOT RUN ON CH

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p394

FAN DOES NOT KICK

CHARACTERISTIC TEST FROM POWER UP

Next: p265

FAN RUNS AT FULL SPEED ON POWER UP

CHARACTERISTIC TEST FROM POWER UP

Next: p612

BURNER DOES NOT LIGHT AND FAN STOPS

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND ESTABLISHES (GAS PRESSURE)

Next: p318

PRESSURE DROPS AWAY COMPLETELY

CHARACTERISTIC TEST FROM GAS INLET PRESSURE (BLIP)

Next: !p323

DROP NOT OBSERVED

CHARACTERISTIC TEST FROM GAS INLET PRESSURE (BLIP)

Next: p623

STANDING PRESSURE INCORRECT OR ABSENT

CHARACTERISTIC TEST FROM GAS INLET PRESSURE (BLIP)

Next: !p492

LIGHT ON FRONT PANEL BUT PUMP NOT RUNNING

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p505

NO LIGHT AND PUMP NOT RUNNING

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p1037

PRESSURE DROPS AWAY COMPLETELY

CHARACTERISTIC TEST FROM GAS INLET PRESSURE (BLIP)

Next: !p680

STANDING PRESSURE INCORRECT OR ABSENT

CHARACTERISTIC TEST FROM GAS INLET PRESSURE (BLIP)

Next: !p699

FAN RUNS CONTINUOUSLY WITH NO LOCKOUT

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND ESTABLISHES (GAS PRESSURE)

Next: p252

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND ESTABLISHES (GAS PRESSURE)

Next: p658

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p832

FAN RUNS FOR APPROXIMATELY 5 SECONDS THEN STOPS

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p826

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p856

BURNER CHECKS UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SENSE ELECTRODE

Next: !p917

ELECTRODE CHECKS UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SENSE ELECTRODE

Next: !p919

THERMAL FUSE FITTED

CHARACTERISTIC TEST FROM OBSERVATION WHAT TYPE OF FLUE PROTECTION

Next: p970

FLUE THERMISTOR FITTED

CHARACTERISTIC TEST FROM OBSERVATION WHAT TYPE OF FLUE PROTECTION

Next: !p978

10/03/2023 09:08:01 2211_3_50_1 21/06/2023 13:21:14

10/03/2023 11:44:55

Next: End

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p1008, !f1009

RESISTANCE DHW MICROSWITCH

GAIN ACCESS TO PCB (

Next: !p1042, !f1043

GAS VALVE SOLENOID RESISTANCE

REMOVE THE PLUG FROM THE GAS VALVE

Next: !p1054, !f1055

DHW PUMP VOLTAGE

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1062, !f1095

FAN VOLTS FROM PCB

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

Next: !p1066, !f1096

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: !p1071, !f1072

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: !p1075, !f1076

RESISTANCE PUMP AND HARNESS

GAIN ACCESS TO PCB AND REMOVE CONNECTOR JP6

Next: !p1089, !f1090

GAS VALVE VOLTS

Next: !p1093, !f1094

OVERHEAT THERMOSTAT RESISTANCE

DISCONNECT BROWN & BLUE LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p255, !f256

VOLTS TO IGNITION PCB AT MAIN PCB

Next: !p259, !f260

ON/OFF SWITCH VOLTAGE (INPUT)

Next: p270, f271

FUSE F1

Next: !p763, !f273

VOLTS AT IGNITION PCB

Next: p334, f333

VOLTS TO IGNITION PCB AT MAIN PCB

Next: !p341, !f342

MAINS POWER TO CLOCK

GAIN ACCESS TO CLOCK CONNECTIONS (USE INSULATION MAT AS NECESSARY)

Next: !p396, !f397

SUMMER/ WINTER SWITCH OPERATION

REMOVE 1 CONNECTOR FROM THE RIGHT HAND SWITCH (PINK LEADS)

Next: !p425, !f413

OPERATIONAL SEQUENCE

NO LONGER USED

Next: !p438, !f439

FAULT CODES

Next: !p442, !f443

HARNESS & DHW SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: !p474, f475

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: !p477, !f478

WATER PRESSURE IN BOILER

Next: p483, !f488

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: !p591, !f573

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: !p589, !f590

DHW ISOLATING VALVE

Next: p7, !f8

PUMP LIMPET TEST

Next: p604, f609

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: !p607, !f608

DHW PUMP VOLTAGE

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p610, !f611

DHW FLOW RATE (HTML LINKS)

Next: !p723, !f722

DISPLAY PCB VOLTS

Next: !p726, f727

DISPLAY PCB HARNESS

REMOVE THE HARNESS F

Next: !p728, !f729

OBSERVATION DOES FAN RUN

{ALLDEMANDOFF}
BO

Next: p797, f777

FAN VOLTS FROM PCB

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

Next: p790, !f791

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: !p835, !f836

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: !p839, !f840

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: !p859, !f860

OBSERVATION DISCONNECT IGNITION PCB

DISCONNECT 7 PIN PLUG FROM IGNITION PCB AND MAKE SAFE

Next: p894, !f866

RESISTANCE WATER PRESSURE SWITCH HARNESS

DISCONNECT PLUG CONN

Next: p967, !f952

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: p987, !f986

INSPECTION DIVERTER MOVEMENT

REMOVE THE MICROSWITCH FROM THE TOP OF THE DIVERTER VALVE AND PLACE IN A SAFE POSITION.

Next: !p1044, !f1082

OBSERVATION DISCONNECT DHW MICROSWITCH

REMOVE THE DHW MICRO

Next: p1034, f1041

DIFFERENTIAL TEMPERATURE (HEATING)

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES

Next: !p421, !f417

PUMP LIMPET TEST

Next: p133, !f415

CONDENSATE TRAP AND DRAIN

Next: p127, !f128

FLUE CHECK

Next: p129, !f130

GAS INLET PRESSURE

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT

Next: !p131, !f596

DIFFERENTIAL TEMPERATURE (PLATE HEX)

Next: !p416, !f414

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: p186, !f187

PUMP LIMPET TEST

Next: !p184, !f185

DIVERTER VALVE OPERATION (CH)

Next: p188, !f189

CH PUMP RUNS CORRECTLY

Next: !p190, !f191

OVERHEAT THERMOSTAT & HARNESS RESISTANCE

REMOVE THE PLUG VG1 FROM THE SIDE OF THE IGNITION PCB

Next: p253, f254

VOLTS AT IGNITION PCB

Next: p389, f258

MAINS POWER SUPPLY

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

Next: p266, f1007

TRANSFORMER VOLTAGE (INPUT)

{ALLDEMANDOFF}

Next: p268, f269

TRANSFORMER VOLTAGE (OUTPUT)

{ALLDEMANDOFF}

Next: p278, !f279

ON/OFF SWITCH VOLTAGE (OUTPUT)

Next: p760, !f277

FAN VOLTS FROM PCB

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

Next: p280, !f281

RESISTANCE FAN HARNESS

REMOVE BOTH ENDS OF THE FAN HARNESS

Next: !p282, !f283

IGNITION PCB SPARKING

REMOVE THE BLACK SHEATHED, GREY SPARK IGNITION LEAD FROM NEAR THE TOP OF THE IGNITION PCB

Next: p320, f332

GAS INLET PRESSURE DROP

ATTACH U-GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p347, ?322, ?324, ?491

VOLTS LOW TO IGN PCB

PRESS THE RESET BUTTON TO RESET ANY LOCKOUT CONDITION.

Next: p335, !f592

RESISTANCE HARNESS IGN PCB LOW VOLTAGE

REMOVE BOTH ENDS OF THE LOW VOLTAGE HARNESS
TO THE IGNITION PCB

Next: !p337, !f344

CONDENSATE TRAP AND DRAIN

Next: p348, !f352

INSPECT BURNER

Next: p426, !f350

VOLTS LOW TO IGN PCB

PRESS THE RESET BUTTON TO RESET ANY LOCKOUT CONDITION.

Next: p390, !f393

RESISTANCE HARNESS IGN PCB LOW VOLTAGE

REMOVE BOTH ENDS OF THE LOW VOLTAGE HARNESS
TO THE IGNITION PCB

Next: !p391, !f392

DOES THE CLOCK OPERATE CORRECTLY

SUMMER/WINTER IN SUMMER POSITION (OUT)
SET THE CLOCK TO THE ON POSITION.

Next: p399, f395

CLOCK INPUT

GAIN ACCESS TO CLOCK CONNECTIONS (USE INSULATION MAT AS NECESSARY)

Next: p404, !f742

EXTERNAL CONTROLS INPUT

ENSURE THE EXTERNAL CONTROLS (IF FITTED) ARE CALLING FOR HEAT

Next: p408, f411

CH POTENTIOMETER RESISTANCE

LOWER THE CONTROL PANEL AND REMOVE THE PCB COVER
LOCATE AND DISCONNECT PLUG MARKED JP5

Next: !p593, !f410

INSPECT ELECTRODES

Next: p494, !f493

HARNESS RESISTANCE (WATER PRESSURE SWITCH CIRCUIT) AT JP11

DISCONNECT PLUG CONNECTOR (MARKED JP11) FROM PCB

Next: p735, f950

RESISTANCE SPARK LEAD

REMOVE BOTH ENDS OF

Next: p498, !f496

INSPECT HEAT EXCHANGER FLUEWAYS

Next: !p499, !f500

DHW PUMP VOLTAGE

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p506, !f517

HARNESS & CH SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: p574, f572

HARNESS & DHW SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: p584, f583

GAS RATE

Next: p585, !f586

TEST FOR TAPS PASSING

ISOLATE THE COLD MAINS SUPPLY TO THE BOILER.

Next: !p587, !f588

HARNESS & CH SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: !p605, f606

DIVERTER VALVE MICROSWITCH (RESISTANCE)

DISCONNECT PLUG CONN

Next: p743, !f616

RESISTANCE FAN HARNESS

REMOVE BOTH ENDS OF THE FAN HARNESS

Next: !p748, !f615

GAS VALVE VOLTS

Next: p625, !f624

GAS VALVE AND HARNESS RESISTANCE - GAS VALVE (RECTIFIER)

REMOVE THE GAS VALVE HARNESS FROM THE
IGNITION PCB BUT LEAVE CONNECTED TO THE GAS VALVE

Next: p637, !f626

GAS VALVE SOLENOID RESISTANCE

REMOVE THE PLUG FROM THE GAS VALVE

Next: !p638, !f639

GAS INLET PRESSURE DROP

ATTACH U-GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p702, ?679, ?698

FLOW BLOCKAGE OR DAMAGE

DHW CIRCUIT FULLY DRAINED AND DISCHARGED.

Next: !p9, ?11, ?13

CONDENSATE TRAP AND DRAIN

Next: p703, !f704

FLAME SENSE HARNESS RESISTANCE

REMOVE BOTH ENDS OF

Next: p993, !f706

OBSERVATION BOILER RESET

ENSURE THE APPLIANCE IS COOL

Next: !p736, !f737

CH SENSOR RESISTANCE

REMOVE THE LEADS FROM THE CH SENSOR

Next: p751, !f747

SUMMER/ WINTER SWITCH OPERATION

REMOVE 1 CONNECTOR FROM THE RIGHT HAND SWITCH (PINK LEADS)

Next: p613, !f755

FUSE F2

Next: !p761, !f762

RESISTANCE FAN HARNESS

REMOVE BOTH ENDS OF THE FAN HARNESS

Next: !p792, !f795

RESISTANCE FAN HARNESS

REMOVE BOTH ENDS OF THE FAN HARNESS

Next: p798, !f799

VOLTAGE FAN HALL SENSOR

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p800, !f802

VOLTAGE FAN HALL SENSOR

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p810, !f824

RESISTANCE FAN HARNESS

REMOVE BOTH ENDS OF THE FAN HARNESS

Next: p809, !f830

HARNESS & CH SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: p833, f834

HARNESS & DHW SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: p837, f838

DHW POTENTIOMETER RESISTANCE

DISCONNECT PLUG MARKED JP5

Next: !p841, !f842

HARNESS & DHW SENSOR RESISTANCE

REMOVE THE PLUG JP11 FROM THE CONTROL BOX

Next: p857, f858

DHW POTENTIOMETER RESISTANCE

DISCONNECT PLUG MARKED JP5

Next: !p861, !f862

FLAME SENSE HARNESS RESISTANCE

REMOVE BOTH ENDS OF

Next: p895, !f896

INSPECTION FLAME SENSE ELECTRODE

DISCONNECT FLAME SENSE LEAD
REMOVE FLAME SENSE ELECTRODE

Next: p898, !f897

CONDENSATE TRAP AND DRAIN

Next: p900, !f899

INSPECT BURNER

Next: p901, !f902

INSPECT HEAT EXCHANGER FLUEWAYS

Next: p903, !f904

FLUE CHECK

Next: !p905, !f906

INSPECTION BURNER AND SENSE ELECTRODE

REMOVE COMPLETE BURNER DOOR / FAN / GAS VALVE ASSEMBLY

Next: p915, ?916, ?918

INSPECT HEAT EXCHANGER FLUEWAYS

Next: !p920, !f921

OBSERVATION WHAT TYPE OF FLUE PROTECTION

Next: p968, ?969, ?971

FLUE STAT RESISTANCE

DISCONNECT THE GREY LEADS FROM THE FLUE STAT

Next: !p981, !f976

RESISTANCE THERMAL FUSE

DISCONNECT CONNECTOR FROM THE THERMAL FUSE

Next: !p980, !f979

DHW SENSOR RESISTANCE

REMOVE THE LEADS FROM THE DHW SENSOR

Next: p990, !f989

OBSERVATION DOES BOILER RESET F4

ENSURE THE APPLIANCE IS COOL

Next: !p991, !f992

FLUE CHECK

Next: p914, !f1004

System Information

Total Tests: 352

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control

XSol Diagnostic System - Generated from extracted test data