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:

WORCESTER 28I RSF

WARNING - IMPORTA

Next: &18, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

RE-IGNITE DELAY

SELECTOR SWITCH TO CH - MID POSITION

Next: &nff, !f168

OVERRUN OPERATION

SELECTOR SWITCH TO CH - MAX POSITION

Next: &1, f162

CH MODULATION

ATTACH A U-GAUGE TO

Next: &2, f253

SYSTEM PRESSURE RISE

Next: &3, !f158

CH OPERATION

ATTACH A U-GAUGE TO

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

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, ?427

AUTO FROST PROTECTION

Next: &7, f126

CH BURNER IGNITES

SELECTOR SWITCH TO CH - MAX POSITION

Next: &8, f115

DHW MAXIMUM GAS PRESSURE

Next: &9, f378

BURNER ESTABLISHES AT MINIMUM PRESSURE

ATTACH A U-GAUGE TO

Next: &10, ?88, ?90, ?185, ?511

DHW BURNER IGNITES

SELECTOR SWITCH IN DHW POSITION

Next: &11, f75

DHW SPARKING

REMOVE INNER CASING COVER
SELECTOR SWITCH IN DHW POSITION

Next: &12, f262

DHW FAN RUNS

SELECTOR SWITCH IN DHW POSITION

Next: &13, ?34, ?36

CH DEMAND PUMP RUN

SELECTOR SWITCH TO CH
ENSURE PUMP IS AT MAX SPEED SETTING

Next: &14, f8

DHW FLOW RATE

Next: &15, f3

WORCESTER 28I RSF

G.C. NUMBER 47 311 5

Next: &328, !f1

TYPE OF DIAGNOSTIC MODEL

PLEASE SELECT FROM O

Next: &16, !f329

FUSE INVESTIGATION TREE

OUTSIDE MODEL

Next: &nff, f402

HOW TO SET MULTIMETER TO DIODE TEST

THE IMAGES BELOW SHO

Next: &nff, !f481

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

EXTERNAL CONTROLS PROGRAMMER (INPUT)

Next: End

CH BURNER IGNITES

EXT CONTROLS - PROGRAMMER

Next: End

CH BURNER IGNITES

EXT CONTROLS - ROOM THERMOSTAT

Next: End

AUTO FROST PROTECTION

THERMISTOR / SENSOR - ELMWOOD

Next: End

DHW OPERATION

FAN ASSEMBLY

Next: End

DHW OPERATION

FLUE

Next: End

DHW OPERATION

INJECTOR NO7 4.5MM

Next: End

DHW MODULATION

THERMISTOR / SENSOR - ELMWOOD

Next: End

CH OPERATION

PIPE ASSEMBLY - BY - PASS

Next: End

CH OPERATION

THERMISTOR / SENSOR - ELMWOOD

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

OVERRUN OPERATION

THERMISTOR / SENSOR - ELMWOOD

Next: End

RE-IGNITE DELAY

PCB

Next: End

CH DEMAND PUMP RUN

EXT CONTROLS - PROGRAMMER

Next: End

BURNER ESTABLISHES AT MINIMUM PRESSURENR

INLET PRESSURE

Next: End

EXTERNAL CONTROLS ROOM THERMOSTAT (INPUT)

Next: End

DHW SPARKING6666123

AIR PRESSURE TUBES

Next: End

AIR CHECK123

KIT - SWITCH AIR PRESSURE

Next: End

DHW SPARKING6666123

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

BROKEN - TURNED OFF

KNOB - CONTROL - AZTEC TOOLING & MOULDING

Next: End

FAN DOES NOT RUN

KIT - SWITCH AIR PRESSURE

Next: End

CH BURNER IGNITES

KNOB - CONTROL - AZTEC TOOLING & MOULDING

Next: End

CH MODULATION

THERMISTOR / SENSOR - ELMWOOD

Next: End

FLUE123

FLUE

Next: End

DHW SPARKING9992222

SAFETY TEMPERATURE LIMITER

Next: End

AIR CHECKNSP

KIT - SWITCH AIR PRESSURE

Next: End

DHW SPARKING9992222NSP

SPARK ELECTRODE ASSEMBLY

Next: End

PCB IGNITION RELAY OPERATION9992222NSP

PCB

Next: End

OVERHEAT THERMOSTAT (RESISTANCE)9992222NSP

HARNESS ASSEMBLY - IGNITION

Next: End

DHW SPARKING6666NSP

AIR PRESSURE TUBES

Next: End

DHW SPARKING6666NSP

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

FLUENSP

FLUE

Next: End

OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

DHW SPARKING - WILL NOT RESET

SAFETY TEMPERATURE LIMITER

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

RUNNING SLOW - OVERHEAT INVESTIGATION

PUMP AND HARNESS ASSEMBLY

Next: End

MIN PRESSURE OUT

GAS VALVE

Next: End

OVERHEAT INVESTIGATION

PIPE ASSEMBLY - BY - PASS

Next: End

OVERHEAT INVESTIGATION CH SENSOR

THERMISTOR / SENSOR - ELMWOOD

Next: End

OVERHEAT INVESTIGATION - NO PUMP OVERRUN

PCB

Next: End

DHW MAXIMUM GAS PRESSURE

INLET PRESSURE

Next: End

CH DEMAND PUMP RUNS

FUSE MAINS

Next: End

CH DEMAND PUMP RUN

KIT - FUSE 1.25A & 2A 20MM

Next: End

DHW FLOW RATE

FILTER GAUZE - EXPAMET

Next: End

CH DEMAND PUMP RUN

FUSE 2A 20MM - SLOW BLOW

Next: End

FUSE INVESTIGATION

PUMP AND HARNESS ASSEMBLY

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION GV1/2

GAS VALVE

Next: End

FUSE INVESTIGATION GV3

GAS VALVE

Next: End

CH OPERATION - TURNED LOW

KNOB - CONTROL - AZTEC TOOLING & MOULDING

Next: End

CH MODULATION - NOT TURNING DOWN

KNOB - CONTROL - AZTEC TOOLING & MOULDING

Next: End

NO VOLTAGE TO PUMP - OVERHEAT INVESTIGATION

PCB

Next: End

DHW MAX GAS PRESSURE - MODUREG

GAS VALVE

Next: End

DHW MODULATION MECHANICAL

GAS VALVE

Next: End

GAS VALVE 1 2 VOLTAGE

GAS VALVE

Next: End

DHW FAN RUNS

AIR PRESSURE TUBES

Next: End

DHW TOO HOT

THERMISTOR / SENSOR - ELMWOOD

Next: End

DHW MAX PRESSURE

THERMISTOR / SENSOR - ELMWOOD

Next: End

NO VOLTAGE TO FLOW SWITCH

PCB

Next: End

DHW BURNER IGNITES

HARNESS - GAS VALVE - DUNGS

Next: End

DHW BURNER IGNITES

PCB

Next: End

DHW FAN RUNS

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

FUSE INVESTIGATION

HARNESS - GAS VALVE - DUNGS

Next: End

BLANK FOR MULTIMETER PAGE

Z DIRECTION CHOICE OR CONTINUE

Next: End

DHW MAX PRESSURE DHW FLOW SWITCH VOLTAGE

PCB

Next: End

CH DEMAND PUMP RUNS

WATER LEAK OR TAP

Next: End

BURNER DOES NOT IGNITE

BURNER ASSEMBLY

Next: End

CH DEMAND PUMP RUN

THERMISTOR / SENSOR - ELMWOOD

Next: End

CH DEMAND PUMP RUN

THERMISTOR / SENSOR - ELMWOOD

Next: End

DHW FAN RUNS

THERMISTOR / SENSOR - ELMWOOD

Next: End

DHW FAN RUNS

THERMISTOR / SENSOR - ELMWOOD

Next: End

CH BURNER IGNITES

THERMISTOR / SENSOR - ELMWOOD

Next: End

BURNER DOES NOT CROSSLIGHT

BURNER ASSEMBLY

Next: End

BURNER PRESSURE GOES STRAIGHT TO HIGH PRESSURE

GAS VALVE

Next: End

MINIMUM BURNER PRESSURE INCORRECT

INLET PRESSURE

Next: End

FAN RUNS SLOW

PCB

Next: End

DHW FLOW RATE

FLOW REGULATOR

Next: End

DHW BURNER IGNITES

INLET PRESSURE

Next: End

DHW BURNER IGNITES

SPARK ELECTRODE ASSEMBLY

Next: End

BURNER ESTABLISHES AT MINIMUM PRESSURE (FAIL)

PROBE - FLAME SENSOR C/W LEAD

Next: End

EXTERNAL CONTROLS PROGRAMMER (OUTPUT)

Next: End

EXTERNAL CONTROLS - ROOM THERMOSTAT (OUTPUT)

Next: End

AUTO FROST PROTECTION

PCB

Next: End

HEAT EXCHANGER NOISY (KETTLES) DURING DHW OPERATION

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

DHW OPERATION

PCB

Next: End

DHW OPERATION

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

DHW MODULATION

GAS VALVE

Next: End

DHW MODULATION

PCB

Next: End

CH OPERATION

Next: End

CH OPERATION

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

CH OPERATION

PCB

Next: End

MAINS POWER SUPPLY

Next: End

OVERRUN OPERATON

PCB

Next: End

BURNER ESTABLISHES AT MINIMUM PRESSURE (PASS)

PROBE - FLAME SENSOR C/W LEAD

Next: End

DHW QUIET OPERATION, RADIATORS COLD

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

HEAT EXCHANGER (SECONDARY COIL)

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

PCB CONTROL BOARD (FLAME SENSE)

PCB

Next: End

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

GAS VALVE

Next: End

AIR PRESSURE SWITCH DROPPING OUT

PCB

Next: End

CH DEMAND PUMP RUN

EXT CONTROLS - ROOM THERMOSTAT

Next: End

CH DEMAND PUMP RUN

PUMP AND HARNESS ASSEMBLY

Next: End

CH MODULATION

PCB

Next: End

SPARKING ELECTRODES123

FAN ASSEMBLY

Next: End

SPARK ELECTRODE LEADS9992222NSP

PCB

Next: End

SPARKING ELECTRODESNSP

FAN ASSEMBLY

Next: End

OVERHEAT INVESTIGATION

HEAT EXCHANGER - GAS TO WATER - PRB 20/501

Next: End

TRIPPING EARLY - OVERHEAT INVESTIGATION

SAFETY TEMPERATURE LIMITER

Next: End

OVERHEAT INVESTIGATION - NOT SHUTTING DOWN

PCB

Next: End

NO FAULT FOUND

OVERHEAT

Next: End

DHW MAXIMUM GAS PRESSURE

PCB

Next: End

FAN DOES NOT RUN

FAN ASSEMBLY

Next: End

CH DEMAND PUMP RUN

Next: End

MAINS FUSE

Z REDIRECT

Next: End

FUSE F2

Z REDIRECT

Next: End

FUSE F1

Z REDIRECT

Next: End

FUSE INVESTIGATION

NO FAULT FUSE INVESTIGATION

Next: End

PCB CONTROL BOARD (POTENTIOMETER)

PCB

Next: End

NOT RUNNING - OVERHEAT INVESTIGATION

PUMP AND HARNESS ASSEMBLY

Next: End

DHW BURNER IGNITES

GAS VALVE ADJUSTMENT

Next: End

DHW TOO HOT

GAS VALVE

Next: End

DHW TOO HOT

PCB

Next: End

DHW MAX PRESSURE

GAS VALVE ADJUSTMENT

Next: End

DHW FAN RUNS

HARNESS - TURBINE FLOW SWITCH ASSEMBLY

Next: End

DHW FAN RUNS

KIT - SWITCH AIR PRESSURE

Next: End

DHW MAX PRESSURE

HARNESS - TURBINE FLOW SWITCH ASSEMBLY

Next: End

CH DEMAND PUMP RUN

HARNESS - TURBINE FLOW SWITCH ASSEMBLY

Next: End

DHW BURNER IGNITES

INJECTOR NO7 4.5MM

Next: End

PUMP DOES NOT RUN 2

HARNESS MAIN

Next: End

PUMP DOES NOT RUN

HARNESS MAIN

Next: End

FAN DOES NOT RUN 2

HARNESS MAIN

Next: End

FAN DOES NOT RUN

HARNESS MAIN

Next: End

CH BURNER IGNITES

HARNESS MAIN

Next: End

FAN DOES NOT RUN

PCB

Next: End

BURNER DOES NOT CROSSLIGHT

INJECTOR NO7 4.5MM

Next: End

BURNER ESTABLISHES AT MIN PRESSURE

GAS VALVE ADJUSTMENT

Next: End

FAN RUNS SLOW

FAN ASSEMBLY

Next: End

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 TOO COOL-RADIATORS REMAIN COOL WITH NO HEAT DEMAND-BOILER QUIET

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: p149

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: p418

BURNER IGNITES,SPARK STOPS,BURNER SHUTS DOWN, SEQUENCE RESTARTS

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p187

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p35

FAN RUNS SLOW

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p37

OVERHEAT TRIPS BEFORE 82°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p371

FLOW TEMPERATURE ABOVE 82°C AND BOILER DOES NOT SHUT DOWN

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p373

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p444

MINIMUM BURNER PRESSURE CORRECT BUT DOES NOT FULLY CROSSLIGHT

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p512

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

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p89

MINIMUM BURNER PRESSURE INCORRECT

CHARACTERISTIC TEST FROM BURNER ESTABLISHES AT MINIMUM PRESSURE

Next: p515

16/12/2020 11:32:38 2012_1_50_1 04/01/2021 12:18:07

16/12/2020 13:46:20

Next: End

MAINS POWER SUPPLY

Next: p14, f389

EXTERNAL CONTROLS - ROOM THERMOSTAT (INPUT)

{GAINPCBACS}

Next: p117, f116

EXTERNAL CONTROLS - PROGRAMMER (INPUT)

Next: p119, !f118

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p128, !f127

DHW MODULATION VOLTAGE

SET DHW FLOW RATE AT TAP TO APPROXIMATELY 5 L/MIN
AND ALLOW DHW TO RUN COLD

Next: !p145, f144

DHW THERMISTOR SENSOR

REMOVE THE YELLOW LE

Next: !p147, !f146

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p164, !f163

AIR PRESSURE SWITCH DROPPING OUT

DISCONNECT THE GREEN WIRE (NORMALLY OPEN CONNECTION) FROM THE AIR PRESSURE SWITCH AND MAKE SAFE

Next: !p192, f193

AIR PRESSURE TUBES

Next: p194, !f195

FUSE F2 (1.25 AMP)

REMOVE BOTTOM FACIA

Next: p210, f395

INSPECTION CONTROL KNOB ON POTENTIOMETER

REMOVE CONTROL KNOB FROM THE FRONT OF THE BOILER

Next: p254, !f423

OBSERVATION OVERHEAT TRIPPED

Next: p263, f264

OVERHEAT THERMOSTAT (RESISTANCE)

DISCONNECT ONE OF THE ORANGE WIRES ON THE OVERHEAT THERMOSTAT

Next: p265, !f266

AIR PRESSURE SWITCH (AIR CHECK)

REMOVE THE AIR PRESSURE SWITCH FROM THE BOILER
(MAKE A NOTE OF THE CONNECTIONS)

Next: p269, !f270

DHW GAUZE FILTER

TURN OFF DHW INLET VALVE AND DRAIN DOWN THE DHW CIRCUIT

Next: p5, !f4

PUMP VOLTAGE

SELECTOR SWITCH TO CH

Next: !p424, !f425

BY-PASS PIPE

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

Next: !p366, !f367

GAS PRESSURE (INLET)

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

Next: p379, !f380

DHW FLOW SWITCH

GAIN ACCESS TO FLOW SWITCH INLINE CONNECTOR

Next: p41, f452

DHW THERMISTOR SENSOR

REMOVE THE YELLOW LE

Next: p385, !f449

RESISTANCE FUSE (MAINS)

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p390, f392

FUSE FURTHER INVESTIGATION

Next: !p393, !f394

FUSE FURTHER INVESTIGATION

Next: !p396, !f397

FUSE FURTHER INVESTIGATION

Next: !p399, !f400

RESISTANCE PUMP

REMOVE BOTTOM FACIA PANEL
DISCONNECT CONNECTOR X3 FROM THE PCB MARKED PUMP

Next: p403, !f406

AIR PRESSURE TUBES

Next: p45, !f44

DHW THERMISTOR SENSOR

REMOVE THE YELLOW LE

Next: !p447, !f448

VOLTAGE PCB TO FLOW SWITCH

GAIN ACCESS TO FLOW SWITCH INLINE CONNECTOR
ENSURE HW TAP IS TURNED OFF

Next: !p453, !f454

VOLTAGE PCB TO FLOW SWITCH

GAIN ACCESS TO FLOW SWITCH INLINE CONNECTOR
ENSURE HW TAP IS TURNED OFF

Next: !p486, !f487

OBSERVATION ISOLATE DHW

ISOLATE THE COLD WAT

Next: !p490, !f491

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p499, !f500

DHW THERMISTOR SENSOR

REMOVE THE YELLOW LE

Next: !p497, !f498

DHW THERMISTOR SENSOR

REMOVE THE YELLOW LE

Next: !p505, !f507

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p503, !f504

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p509, !f510

BURNER PRESSURE IGNITION

SELECTOR SWITCH IN DHW POSITION
ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p77, f76

GAS VALVE 1 & 2 VOLTAGE

{GAINPCBACS}
SELECTOR SWITCH IN DHW POSITION

Next: p79, !f456

EXTERNAL CONTROLS - ROOM THERMOSTAT (OUTPUT)

{GAINPCBACS}

Next: p10, f9

EXTERNAL CONTROLS - PROGRAMMER (INPUT)

Next: p12, f11

FLAME SENSOR ELECTRODE GAP

Next: !p166, !f96

PUMP VOLTAGE

SELECTOR SWITCH TO CH

Next: !p22, f21

EXTERNAL CONTROLS - ROOM THERMOSTAT (OUTPUT)

{GAINPCBACS}

Next: p248, !f122

EXTERNAL CONTROL - PROGRAMMER (OUTPUT)

Next: !p121, !f120

EXTERNAL CONTROL - PROGRAMMER (OUTPUT)

Next: p18, !f17

CH THERMISTOR SENSOR & HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p125, f508

INSPECTION FAN

Next: p138, !f137

BURNER INJECTOR

REMOVE COMBUSTION CHAMBER COVER
REMOVE BURNER TO GAIN ACCESS TO BURNER INJECTOR

Next: !p167, !f141

FLUE

Next: !p140, !f139

FUSE F1 (2 AMP)

REMOVE BOTTOM FACIA

Next: !p16, f398

BY-PASS PIPE

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

Next: !p155, !f154

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p157, !f156

EXTERNAL CONTROLS - ROOM THERMOSTAT (INPUT)

{GAINPCBACS}

Next: !p20, !f19

GAS PRESSURE (INLET)

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

Next: p188, !f189

GAS VALVE VOLTAGE (CONSTANT)

{GAINPCBACS}
SELECTOR SWITCH IN DHW POSITION

Next: !p190, f191

AIR PRESSURE SWITCH (AIR CHECK)

REMOVE THE AIR PRESSURE SWITCH FROM THE BOILER
(MAKE A NOTE OF THE CONNECTIONS)

Next: p196, !f197

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p198, !f199

INSPECTION FLUE

Next: !p260, !f261

INSPECTION CONTROL KNOB ON POTENTIOMETER

REMOVE CONTROL KNOB FROM THE FRONT OF THE BOILER

Next: p411, !f220

AIR PRESSURE SWITCH RESISTANCE (N/O)

DISCONNECT THE BROWN WIRE FROM THE AIR PRESSURE SWITCH COMMON TERMINAL

Next: p43, !f247

INSPECTION CONTROL KNOB ON POTENTIOMETER

REMOVE CONTROL KNOB FROM THE FRONT OF THE BOILER

Next: p123, !f252

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p255, !f256

OVERHEAT FURTHER INVESTIGATION

RESET THE OVERHEAT THERMOSTAT BY PUSHING IN THE BUTTON UNDERNEATH THE BOILER.

Next: p330, !f304

AIR PRESSURE SWITCH TESTING KIT (AIR CHECK)

REMOVE PLUS AND MINU

Next: p267, f268

AIR PRESSURE TUBES

Next: p277, !f278

SPARK ELECTRODES

REMOVE INNER CASING PANEL

Next: p271, !f272

PCB IGNITION RELAY OPERATION

{GAINPCBACS}
SELECTOR SWITCH IN DHW POSITION

Next: p273, !f274

SPARK ELECTRODE LEADS

REMOVE THE ELECTRODE LEADS

Next: !p275, !f276

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p279, !f280

INSPECTION FLUE

Next: !p281, !f282

INSPECTION PRESSURE SYSTEM

Next: p359, !f285

CH DEMAND PUMP RUN

SELECTOR SWITCH TO CH
ENSURE PUMP IS AT MAX SPEED SETTING

Next: p283, f356

FAN VOLTAGE

SELECTOR SWITCH IN DHW POSITION

Next: !p39, f38

PUMP LIMPET TEST

Next: p360, !f361

PRESSURE MINIMUM ON CH

ATTACH A U-GAUGE TO

Next: p362, !f363

CH OPERATION (OVERHEAT)

ENSURE ALL RADIATORS ARE TURNED ON
SELECTOR SWITCH TO CH - MAX POSITION

Next: p364, f365

OBSERVATION RUN BOILER UP TO TEMPERATURE

ATTACH TEMPERATURE PROBE TO THE FLOW PIPE NEAR TO THE FLOW THERMISTOR
CH TEMPERATURE SET TO MAX

Next: p368, ?370, ?372

OVERRUN OPERATION

SELECTOR SWITCH TO CH - MAX POSITION

Next: !p376, !f377

FAN VOLTAGE

SELECTOR SWITCH IN DHW POSITION

Next: !p53, !f52

CH THERMISTOR SENSOR

REMOVE THE RED LEADS FROM CH THERMISTOR

Next: !p374, !f375

GAS VALVE 3 (RESISTANCE)

REMOVE ONE OF THE BLUE WIRES ATTACHED TO THE MODULATING SOLENOID

Next: p381, !f426

DHW MODULATION VOLTAGE (FULL)

Next: p429, f384

DHW FLOW SWITCH

GAIN ACCESS TO FLOW SWITCH INLINE CONNECTOR

Next: !p387, f485

RESISTANCE FAN

REMOVE BOTTOM FACIA PANEL
DISCONNECT CONNECTOR X4 FROM THE PCB MARKED FAN

Next: p404, !f407

GAS VALVE 1 & 2 RESISTANCE

REMOVE LOWER FACIA PANEL
DISCONNECT THE PLUG FROM THE GAS VALVE

Next: p457, !f408

GAS VALVE 3 (RESISTANCE)

REMOVE ONE OF THE BLUE WIRES ATTACHED TO THE MODULATING SOLENOID

Next: !p409, !f410

AIR PRESSURE SWITCH RESISTANCE (N/C)

DISCONNECT THE BROWN WIRE FROM THE AIR PRESSURE SWITCH COMMON TERMINAL

Next: p240, f42

DHW FLOW SWITCH (NO DEMAND)

GAIN ACCESS TO FLOW SWITCH INLINE CONNECTOR

Next: p412, f489

DHW THERMISTOR SENSOR & HARNESS

REMOVE CONNECTOR X6

Next: p414, f496

CH THERMISTOR SENSOR & HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p416, f495

INSPECTION CONTROL KNOB ON POTENTIOMETER

REMOVE CONTROL KNOB FROM THE FRONT OF THE BOILER

Next: p153, !f422

ADJUSTMENT GAS VALVE

ATTEMPT TO ADJUST TH

Next: !p451, !f431

DHW THERMISTOR SENSOR & HARNESS

REMOVE CONNECTOR X6

Next: p49, f501

ADJUSTMENT GAS VALVE

ATTEMPT TO ADJUST TH

Next: !p433, !f434

DHW MODULATION VOLTAGE

SET DHW FLOW RATE AT TAP TO APPROXIMATELY 5 L/MIN
AND ALLOW DHW TO RUN COLD

Next: !p445, f446

FLOW SENSOR (VENTURI)

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: !p47, !f46

DIODE TEST HARNESS GAS VALVE

DISCONNECT GAS VALVE

Next: p405, !f461

CH THERMISTOR SENSOR & HARNESS

REMOVE CONNECTOR X6 FROM THE PCB

Next: !p51, f502

INSPECTION BURNER

Next: !p493, !f494

DHW FLOW RESTRICTOR

TURN OFF DHW INLET VALVE AND DRAIN DOWN THE DHW CIRCUIT.

Next: !p169, !f6

INSPECTION BURNER

Next: !p513, !f514

GAS PRESSURE (INLET)

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

Next: p516, !f519

ADJUSTMENT GAS VALVE

ATTEMPT TO ADJUST TH

Next: !p517, !f518

SPARK ELECTRODES GAP

Next: p492, !f84

DIODE TEST HARNESS GAS VALVE

DISCONNECT GAS VALVE

Next: p81, !f455

GAS PRESSURE (INLET)

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

Next: p432, !f82

FLAME SENSE (OUTPUT)

DISCONNECT FLAME SEN

Next: !p170, f94

System Information

Total Tests: 282

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control