XSol Diagnostic System

Next: &nff, f411

FAIL POINT B

Next: &nff, f423

FAIL POINT C

Next: &nff, f431

FAIL POINT D

Next: &nff, f435

FAIL POINT E

Next: &nff, f451

FAIL POINT F

Next: &nff, f465

FAIL POINT G

Next: &nff, f650

FAIL POINT H - LINK TO DHW SPARKING

Next: &nff, !f512

FAULT CODES

Next: &nff, !f514

FAIL POINT I

Next: &nff, f550

FAIL POINT J

Next: &nff, f560

FAIL POINT K & L

Next: &nff, f590

GAS VALVE SOUNDNESS

GAS VALVE

Next: End

EXCESSIVE SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

OVERRUN OPERATION

PCB

Next: End

RE-IGNITION DELAY

PCB

Next: End

CH BURNER IGNITES

MICROSWITCH - PRETTL

Next: End

DHW FAN RUNS

MICROSWITCH - PRETTL

Next: End

DHW FAN RUNS

KIT - THERMISTOR - SENSOR

Next: End

DHW FAN RUNS

FUSE F1 (2 AMP)

Next: End

DHW FAN RUNS

FUSE F2 (1.6 AMP)

Next: End

BURNER IGNITES BUT PRESSURE IS LOW

GAS INLET SUPPLY

Next: End

DHW FAN RUNS

TRANSFORMER

Next: End

DHW DEMAND

WATER VALVE - FLOW SWITCH

Next: End

DHW FANS RUNS

TUBING

Next: End

DHW BURNER IGNITES

KIT - THERMISTOR - SENSOR

Next: End

DHW HIGH FLAME

KIT - THERMISTOR - SENSOR

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL CHECKS

Next: End

CH MODULATION

KIT - THERMISTOR SENSOR

Next: End

DHW FAN RUNS

VENTURI

Next: End

DHW BURNER IGNITES

GAS INLET SUPPLY

Next: End

DHW LOW FLAME

GAS INLET SUPPLY

Next: End

DHW MODULATION

KIT - THERMISTOR - SENSOR

Next: End

DHW FAN RUNS

KIT - THERMISTOR SENSOR

Next: End

FAN RUNS FOR 30 TO 35 SECONDS THEN STOPS

KIT - THERMISTOR SENSOR

Next: End

DHW BURNER IGNITES

KIT - THERMISTOR SENSOR

Next: End

DHW BURNER IGNITES OPERATING SOLENOID

GAS VALVE

Next: End

ELECTRICAL MODULATING SOLENOID

GAS VALVE

Next: End

CH SENSOR (HIGH)

KIT - THERMISTOR SENSOR

Next: End

DHW NOT HOT ENOUGH

BURNER INJECTOR

Next: End

DHW DOES NOT GET HOT ENOUGH

GAS INLET SUPPLY

Next: End

FAN RUNS FOR 40 SECONDS OR LONGER

THERMOSTAT 116 DEG C - SECURITY

Next: End

FAN RUNS FOR 40 SECONDS OR LONGER

KIT - THERMISTOR SENSOR

Next: End

DHW SPARKING

HARNESS - IGNITION

Next: End

DHW SPARKING

ELECTRODE - DOUBLE - VULCANO

Next: End

DHW DOES NOT ESTABLISH

GAS INLET SUPPLY

Next: End

DHW DOES NOT ESTABLISH

FLUE

Next: End

DHW DOES NOT ESTABLISH

HEAT EXCHANGER ASSEMBLY

Next: End

DHW DOES NOT ESTABLISH

GAS VALVE

Next: End

DHW DOES NOT ESTABLISH

BURNER

Next: End

DHW DOES NOT ESTABLISH

SET - ELECTRODES

Next: End

AUTO FROST PCB

KIT - THERMISTOR SENSOR

Next: End

DOES NOT ESTABLISH LOW PRESSURE

GAS INLET SUPPLY

Next: End

DHW FLOW RATE

WATER VALVE - DHW FLOW ADJUSTER

Next: End

DHW FLOW RATE

FILTER - WATER - PRETTL

Next: End

DHW FLOW RATE

WATER SUPPLY

Next: End

CENTRAL HEATING OPERATION

PIPE ASSEMBLY - BYPASS

Next: End

CENTRAL HEATING OPERATION

MICROSWITCH - PRETTL

Next: End

CH PUMP RUNS

KIT - THERMISTOR SENSOR

Next: End

NO POWER TO ROOM STAT

PCB

Next: End

CH OPERATION SYSTEM NOT HEATING

PUMP

Next: End

DHW BURNER ESTABLISHES

HARNESS - FLAME SENSE ELECTRODE

Next: End

CH OPERATION NOISY

PUMP

Next: End

TYPE OF DIAGNOTIC PROCEDURE

Z REDIRECT

Next: End

FAIL POINT A

FUSE F1 (2 AMP)

Next: End

FAIL POINT A

Next: End

FAIL POINT B

FUSE F2 (1.6 AMP)

Next: End

FAIL POINT B

TRANSFORMER

Next: End

FAIL POINT C

PCB

Next: End

FAIL POINT D - NEON FAULTY

PCB

Next: End

FAIL POINT E - NEON FAULTY

PCB

Next: End

FAIL POINT F

FROST PROTECTION

Next: End

FAIL POINT F

KIT - THERMISTOR SENSOR

Next: End

FAIL POINT H

Z REDIRECT

Next: End

FAULT CODES

Z REDIRECT

Next: End

DHW FAN RUNS

Next: End

FAIL POINT E

MICROSWITCH - PRETTL

Next: End

FAIL POINT E

WATER VALVE - FLOW SWITCH

Next: End

FAIL POINT I

KIT - THERMISTOR SENSOR

Next: End

FAIL POINT I

KIT - THERMISTOR - SENSOR

Next: End

FAIL POINT J - NO POWER TO FAN

PCB

Next: End

FAN RUNS FOR 30 TO 35 SECONDS THEN STOPS

THERMOSTAT 116 DEG C - SECURITY

Next: End

FAIL POINT K

Z REDIRECT

Next: End

FAIL POINT J - SHORTING APS

TUBING

Next: End

FAIL POINT J - SHORTING APS

VENTURI

Next: End

DHW BURNER ESTABLISHED - BAFFLES

BURNER

Next: End

FAIL POINT D - NO VOLTAGE TO EXT CONTROLS

PCB

Next: End

BURNER DOES NOT IGNITE OR IGNITES AND DOES NOT RAMP-UP

PCB

Next: End

FAIL POINT D - IGNORING CH DEMAND

PCB

Next: End

CH PUMP RUNS - NO TIMER

PCB

Next: End

FAIL POINT D - NO TIMER

PCB

Next: End

FAIL POINT G - NO POWER TO PUMP

PCB

Next: End

FAIL POINT G - RUNNING SLOW

PUMP

Next: End

FAIL POINT G

GAS INLET SUPPLY

Next: End

FAIL POINT G

GAS VALVE

Next: End

FAIL POINT G

PCB ADJUSTMENT

Next: End

FAIL POINT GDHW DOES NOT GET HOT ENOUGH

GAS INLET SUPPLY

Next: End

FAIL POINT GDHW NOT HOT ENOUGH

BURNER INJECTOR

Next: End

FAIL POINT G - NO PUMP OVERRUN

PCB

Next: End

FAIL POINT G - OPEN CIRCUIT

THERMOSTAT 116 DEG C - SECURITY

Next: End

FAIL POINT GCENTRAL HEATING OPERATION

PIPE ASSEMBLY - BYPASS

Next: End

FAIL POINT G

KIT - THERMISTOR SENSOR

Next: End

FAIL POINT G

KIT - THERMISTOR - SENSOR

Next: End

DHW SPARKING

TUBING

Next: End

DHW SPARKING

VENTURI

Next: End

DHW SPARKING

FLUE

Next: End

DHW SPARKING

PRESSURE SWITCH - AIR

Next: End

FLAME DIES OR BAFFLES

GAS INLET SUPPLY

Next: End

FAILING TEST KIT DROPING OUT ON HIGH FLAME

PRESSURE SWITCH - AIR

Next: End

FAIL POINT J - APS NOT SWITCHING DROPING OUT ON HIGH FLAME

TUBING

Next: End

FAIL POINT J - APS NOT SWITCHING DROPING OUT ON HIGH FLAME

VENTURI

Next: End

FAIL POINT J DROPING OUT ON HIGH FLAME

FLUE

Next: End

RESTRICTED FLUEWAYS CAUSING BAFFLING

HEAT EXCHANGER ASSEMBLY

Next: End

FAILING TEST KIT

PRESSURE SWITCH - AIR

Next: End

FAIL POINT J - APS NOT SWITCHING

TUBING

Next: End

FAIL POINT J - APS NOT SWITCHING

VENTURI

Next: End

FAIL POINT J

FLUE

Next: End

DHW LOW FLAME

GAS VALVE

Next: End

DHW MODULATION

PCB

Next: End

BURNER IGNITES AT FULL PRESSURE

PCB

Next: End

DHW DOES NOT GET HOT ENOUGH

HEAT EXCHANGER ASSEMBLY

Next: End

DHW HIGH FLAME

PCB

Next: End

FUSE F2 (1,6 AMP)

PCB

Next: End

DHW BURNER IGNITES

BURNER INJECTOR

Next: End

DHW FAN RUNS

PRESSURE SWITCH - AIR

Next: End

DHW LOW FLAME

FLUE

Next: End

CH MODULATION

PCB

Next: End

DHW FAN RUNS

PCB

Next: End

BURNER PRESSURE (GAS PRESENT)

GAS VALVE

Next: End

DHW NOISY OPERATION

HEAT EXCHANGER ASSEMBLY

Next: End

MECHANICAL MODULATING SOLENOID

GAS VALVE

Next: End

PCB (LOCKOUT RESET)

PCB (LOCKOUT RESET)

Next: End

DHW SPARKING

PCB

Next: End

DHW DOES NOT ESTABLISH

PCB

Next: End

FROST PROTECTION

PCB

Next: End

DHW DOES NOT ESTABLISH

GAS VALVE ADJUSTMENT

Next: End

DHW FLOW RATE

HEAT EXCHANGER ASSEMBLY

Next: End

CH NOISY OPERATION, DHW OPERATION SATISFACTORY

SYSTEM RESTRICTIONS

Next: End

CENTRAL HEATING OPERATION

PUMP

Next: End

DHW FAN RUNS

FAN ASSEMBLY

Next: End

CH BURNER IGNITES

Next: End

PCB (ON/OFF SWITCH)

PCB

Next: End

CENTRAL HEATING OPERATION

SYSTEM RESTRICTIONS

Next: End

FAIL POINT A

PCB

Next: End

FAIL POINT B

PCB

Next: End

FAIL POINT C

Z REDIRECT

Next: End

FAIL POINT D

Z REDIRECT

Next: End

FAIL POINT E

PCB

Next: End

FAIL POINT E

Z REDIRECT

Next: End

FAIL POINT F

PCB

Next: End

TRANSFORMER VOLTAGE (OUTPUT)

PCB

Next: End

FAIL POINT I

PCB

Next: End

FAIL POINT J - NOT RUNNING

FAN ASSEMBLY

Next: End

FAIL POINT K

PCB

Next: End

FAIL POINT J - SHORTED

PRESSURE SWITCH - AIR

Next: End

NOT ESTABLISHING BAFFLES OUT

GAS VALVE

Next: End

FAIL POINT D

Next: End

CH PUMP RUNS

PROGRAMMER

Next: End

FAIL POINT D

PROGRAMMER

Next: End

FAIL POINT G

PRESSURE GAUGE

Next: End

FAIL POINT G

SYSTEM PRESSURE

Next: End

FAIL POINT G - NOT RUNNING

PUMP

Next: End

FAIL POINT G

GAS VALVE ADJUSTMENT

Next: End

FAIL POINT GDHW NOISY OPERATION

HEAT EXCHANGER ASSEMBLY

Next: End

FAIL POINT GDHW DOES NOT GET HOT ENOUGH

HEAT EXCHANGER ASSEMBLY

Next: End

FAIL POINT G CENTRAL HEATING OPERATION

SYSTEM RESTRICTIONS

Next: End

FAIL POINT G

THERMOSTAT 116 DEG C - SECURITY

Next: End

FAIL POINT G - NOT SHUTTING DOWN

PCB

Next: End

NO FAULT FOUND

OVERHEAT

Next: End

FAIL POINT G - STUCK IN FAULT

PCB

Next: End

FAIL POINT G CH NOISY OPERATION DHW OPERATION SATISFACTORY

SYSTEM RESTRICTIONS

Next: End

GAS VALVE 24 VOLT SUPPLY

PCB

Next: End

DIRTY

FAN ASSEMBLY

Next: End

DIRTY OR RUNNING SLOW DROPPING OUT ON HIGH FLAME

FAN ASSEMBLY

Next: End

FAIL POINT J - RUNNING SLOW

FAN ASSEMBLY

Next: End

BURNER IGNITES AT FULL PRESSURE

CHARACTERISTIC TEST FROM DHW LOW FLAME

Next: !p101

FLAME DIES OUT OR BAFFLES

CHARACTERISTIC TEST FROM DHW HIGH FLAME

Next: p830

BURNER IGNITES, BUT BURNER PRESSURE IS LOW

CHARACTERISTIC TEST FROM DHW HIGH FLAME

Next: p105

BURNER IGNITES AT FULL PRESSURE

CHARACTERISTIC TEST FROM DHW LOW FLAME

Next: p107

BURNER IGNITES BUT DOES NOT RAMP-UP

CHARACTERISTIC TEST FROM CH BURNER IGNITES

Next: p109

DHW DOES NOT GET HOT ENOUGH

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p115

DHW NOISY OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p295

RADIATORS HEAT UP BUT HEAT EXCHANGER NOISY (KETTLES)

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p402

SYSTEM DOES NOT HEAT, BUT BOILER REACHES TEMPERATURE

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p398

IGNITION PRESSURE LOW

CHARACTERISTIC TEST FROM PRESSURE IGNITION

Next: p328

PRESSURE AS ABOVE AND INCREASES BEFORE CUTTING OUT

CHARACTERISTIC TEST FROM PRESSURE IGNITION

Next: p330

FAN RUNS FOR 30 TO 35 SECONDS THEN STOPS

CHARACTERISTIC TEST FROM DHW SPARKING

Next: p52

FAN RUNS FOR 40 SECONDS OR LONGER

CHARACTERISTIC TEST FROM DHW SPARKING

Next: p306

PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p706

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p708

DHW DOES NOT GET HOT ENOUGH

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p726

DHW NOISY OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p728

RADIATORS HEAT UP BUT HEAT EXCHANGER NOISY (KETTLES)

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p759

SYSTEM DOES NOT HEAT, BUT BOILER REACHES TEMPERATURE

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: !p738

RETURNS TO OVERHEAT FAULT CODE BEFORE 82°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p748

FLOW TEMPERATURE ABOVE 88°C AND BOILER DOES NOT SHUT DOWN

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p750

BURNER IGNITES, BUT FLAME DIES OUT OR BAFFLES

CHARACTERISTIC TEST FROM DHW LOW FLAME

Next: p99

14/01/2020 15:00:26 2002_1_50_1 06/02/2020 11:51:06

16/01/2020 11:33:05

Next: End

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p358, !f359

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: !p120, !f258

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p285, !f211

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: p170, !f207

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: !p293, !f238

TRANSFORMER VOLTAGE (OUTPUT)

{GAINPCBACS}

Next: p31, f30

ON/OFF SWITCH VOLTAGE (OUTPUT)

Next: p33, f32

FUSE F1 (2 AMP)

REMOVE FUSE F1 FROM PCB

Next: p179, !f178

PRESSURE IGNITION

ATTACH U-GAUGE TO GAS VALVE OUTLET PRESSURE TEST POINT

Next: p326, ?327, ?329

AIR PRESSURE SWITCH TUBES

Next: p37, !f204

OBSERVATION WATER SUPPLY TO BOILER

Next: p363, !f368

FLOW SWITCH MICROSWITCH (RESISTANCE)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p43, !f176

PUMP VOLTAGE

REMOVE ELECTRICAL COVER FROM PUMP

Next: !p385, f386

FLOW SWITCH MICROSWITCH (OPEN CIRCUIT)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p389, !f388

VOLTAGE FROM BOILER TO EXTERNAL CONTROLS

Next: !p395, !f396

FUSE F1 (2 AMP) (FAULT CODE)

REMOVE FUSE F1 FROM PCB

Next: p412, !f413

FUSE F2 (1.6 AMP) (FAULT CODE)

REMOVE FUSE F2 FROM PCB

Next: p424, !f425

INFORMATION FAIL POINT C

Next: !p432, !f433

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

BOILER ON/OFF SWITCH OFF
CH THERMOSTAT TO MAX POSITION
REMOVE PUMP VENT SCREW AS NECESSARY

Next: p436, f437

VOLTAGE FROM EXTERNAL CONTROLS TO BOILER

{GAINPCBACS}

Next: p645, f631

OBSERVATION DOES BOILER RESPOND TO DHW DEMAND

BOILER ON/OFF SWITCH OFF

Next: p452, f453

DHW DEMAND

Next: p454, !f517

TEMPERATURE AMBIENT

Next: p466, !f467

CH SENSOR (FAULT CODE)

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p551, !f552

OBSERVATION DOES FAN RUN BEFORE LOCKOUT

BOILER ON/OFF SWITCH ON

Next: p843, f562

AIR PRESSURE SWITCH (OPEN CIRCUIT)

REMOVE GREEN WIRES FROM AIR PRESSURE SWITCH

Next: p563, f596

INFORMATION FAIL POINT K & L

FAULT CODES NOT

Next: !p591, !f592

AIR PRESSURE SWITCH TUBES

Next: p597, !f598

VOLTAGE FROM BOILER TO EXTERNAL CONTROLS

Next: !p632, !f633

OBSERVATION BOILER RESET (OVERHEAT)

ENSURE BOILER IS COOL

Next: p703, f755

PUMP VOLTAGE

REMOVE ELECTRICAL COVER FROM PUMP

Next: !p711, !f712

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p717, !f718

OVERHEAT THERMOSTAT RESISTANCE

DISCONNECT ORANGE WIRES FROM OVERHEAT THERMOSTAT

Next: !p758, !f757

MAIN GAS VALVE VOLTAGE

REMOVE CONNECTORS (O

Next: p217, f77

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p80, !f264

AIR PRESSURE SWITCH TUBES

Next: p822, !f823

FULL VOLTAGE MODULATING SOLENOID

REMOVE CONNECTOR (BL

Next: p164, f163

FLOW SWITCH MICROSWITCH (OPEN CIRCUIT)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p142, !f141

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p397, !f299

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p152, !f303

GAS RATE

Next: !p154, !f302

MODULATING SOLENOID RESISTANCE

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p298, !f297

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: !p196, !f195

MAINS POWER

BOILER ON/OFF SWITCH OFF

Next: !p289, !f515

TRANSFORMER RESISTANCE

REMOVE TRANSFORMER F

Next: !p199, !f200

MAIN GAS VALVE SOLENOID RESISTANCE

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p218, !f296

BURNER PRESSURE (GAS PRESENT)

BOILER ON/OFF SWITCH OFF
ATTACH U-GAUGE TO GAS VALVE OUTLET PRESSURE TEST POINT

Next: !p227, f228

OVERHEAT THERMOSTAT RESISTANCE

DISCONNECT ORANGE WIRES FROM OVERHEAT THERMOSTAT

Next: p307, !f308

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p309, !f310

SPARK ELECTRODE LEADS

Next: p311, !f312

AIR PRESSURE SWITCH (OPEN CIRCUIT)

REMOVE GREEN WIRES FROM AIR PRESSURE SWITCH

Next: p35, f34

SPARK ELECTRODES

Next: !p313, !f314

FLAME SENSE ELECTRODE

Next: p369, !f352

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p337, !f361

FUSE F2 (1.6 AMP)

REMOVE FUSE F2 FROM PCB

Next: p198, !f180

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p331, !f345

INSPECTION FLUE

Next: p333, !f346

INSPECTION HEAT EXCHANGER

INSPECT THE HEAT EXCHANGER FLUEWAYS FOR RESTRICTIONS OR BLOCKAGES.

Next: p628, !f347

ADJUSTMENT IGNITION PRESSURE

ATTACH U-GAUGE TO GA

Next: !p360, !f348

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p351, !f350

FAN VOLTAGE

BOILER ON/OFF SWITCH OFF

Next: !p39, f38

DHW FLOW ADJUSTER

Next: p364, !f365

DHW INLET FILTER

BOILER DRAINED AND DISCHARGED
WATER OFF

Next: !p366, !f367

RESISTANCE HARNESS FLAME SENSE ELECTRODE

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
DISCONNECT PLUG ST16 FROM THE PCB

Next: p341, !f401

VENTURI (AIR DETECT)

Next: !p235, !f236

BY-PASS CHECK

DISCHARGE AND DRAIN BOILER

Next: !p381, !f382

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p392, !f391

VOLTAGE FROM EXTERNAL CONTROLS TO BOILER

{GAINPCBACS}

Next: p640, f394

PUMP LIMPET TEST

Next: !p399, !f400

PUMP LIMPET TEST

Next: p380, !f406

MAINS POWER

BOILER ON/OFF SWITCH OFF

Next: !p416, !f417

TRANSFORMER RESISTANCE

REMOVE TRANSFORMER F

Next: !p428, !f429

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p45, !f260

INFORMATION FAIL POINT D

Next: !p440, !f441

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: !p47, !f177

INFORMATION FAIL POINT E

Next: !p462, !f463

FLOW SWITCH MICROSWITCH (RESISTANCE)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p458, !f516

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p468, !f469

AIR PRESSURE SWITCH (AIR DETECT)

BOILER ON/OFF SWITCH

Next: p56, f821

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: !p555, !f556

OVERHEAT THERMOSTAT RESISTANCE

DISCONNECT ORANGE WIRES FROM OVERHEAT THERMOSTAT

Next: p60, !f59

FAN VOLTAGE

BOILER ON/OFF SWITCH OFF

Next: !p571, !f572

VENTURI (AIR DETECT)

Next: !p599, !f600

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p305, !f262

INSPECTION BURNER ASSEMBLY

REMOVE THE BURNER ASSEMBLY FROM THE APPLIANCE

Next: !p629, !f630

OBSERVATION DISCONNECT INTERNAL TIMER

UNPLUG INTERNAL TIME

Next: !p635, !f636

OBSERVATION DISCONNECT INTERNAL TIMER

UNPLUG INTERNAL TIME

Next: !p638, !f639

OBSERVATION IS INTERNAL TIMER FITTED

Next: p634, !f644

OBSERVATION IS INTERNAL TIMER FITTED

Next: p637, !f649

INSPECTION PRESSURE SYSTEM

Next: p704, ?705, ?707

CH PUMP RUNS

BOILER ON/OFF SWITCH OFF
CH THERMOSTAT TO MAX POSITION
REMOVE PUMP VENT SCREW AS NECESSARY

Next: p709, f710

PUMP LIMPET TEST

Next: p713, !f714

PRESSURE BURNER MAX AND MIN

ATTACH U-GAUGE TO GA

Next: p715, f716

PRESSURE BURNER CH MODE

CH TEMPERATURE SELEC

Next: p763, !f722

ADJUSTMENT PRESSURE MIN AND MAX

ATTACH U-GAUGE TO GA

Next: !p719, !f720

DHW OPERATION

BOILER ON/OFF SWITCH OFF
DHW TEMPERATURE SET TO MAX

Next: p723, ?725, ?727

CENTRAL HEATING OPERATION

ROOM THERMOSTAT (IF FITTED) CALLING

Next: p733, ?735, ?737

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p729, !f730

GAS RATE

Next: !p731, !f732

OBSERVATION RUN BOILER UP TO TEMPERATURE

CH TEMPERATURE SELECTOR TO MAX
ATTACH TEMPERATURE CLAMP TO THE FLOW PIPE NEAR THE APS

Next: p745, ?747, ?749

OVERRUN OPERATION

Next: !p753, !f754

BY-PASS CHECK

DISCHARGE AND DRAIN BOILER

Next: !p760, !f761

CH SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p793, !f792

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: p721, !f820

DHW SENSOR

DISCONNECT YELLOW WIRES FROM DHW SENSOR
ENSURE DHW IS COOL

Next: !p82, !f206

VENTURI (AIR DETECT)

Next: p824, !f825

FLUE OPERATION

Next: p826, !f827

RESISTANCE APS WITH KIT

REMOVE THE WIRES AND

Next: !p828, !f829

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: p831, !f832

RESISTANCE APS WITH KIT

REMOVE THE WIRES AND

Next: p833, !f834

AIR PRESSURE SWITCH TUBES

Next: p835, !f836

VENTURI (AIR DETECT)

Next: p837, !f838

FLUE OPERATION

Next: p839, !f840

INSPECTION HEAT EXCHANGER

INSPECT THE HEAT EXCHANGER FLUEWAYS FOR RESTRICTIONS OR BLOCKAGES.

Next: !p841, !f842

RESISTANCE APS WITH KIT

REMOVE THE WIRES AND

Next: p844, !f845

AIR PRESSURE SWITCH TUBES

Next: p846, !f847

VENTURI (AIR DETECT)

Next: p848, !f849

FLUE OPERATION

Next: !p850, !f851

GAS INLET PRESSURE

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT
GAS ON
BOILER ON/OFF SWITCH ON

Next: !p250, !f251

System Information

Total Tests: 340

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

Welcome to the XSol Diagnostic System