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 35 CDI

WARNING - IMPORTA

Next: &20, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

PUMP & FAN OVERRUNS

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR TO MAX
DHW TEMPERATURE SELECTOR OFF

Next: &271, f25

AUTO-FROST PROTECTION

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: &6, f24

CENTRAL HEATING OPERATION

BOILER ON/OFF SWITCH

Next: &7, ?33, ?35, ?37, ?39

SYSTEM PRESSURE RISE

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR TO MAX
DHW TEMPERATURE SELECTOR OFF

Next: &8, !f41

DHW OPERATION

BOILER ON/OFF SWITCH

Next: &9, ?42, ?44, ?46, ?48, ?50, ?52

GAS VALVE SOUNDNESS CHECK

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: &10, !f174

CH FAN RUNS AND BOILER IGNITES

BOILER ON/OFF SWITCH

Next: &11, ?170, ?172

DHW BURNER IGNITES AND PRESSURE INCREASES TO MAX

BOILER ON/OFF SWITCH

Next: &332, ?162, ?164, ?166, ?168

FAN RUNS & IGNITION SPARKING

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: &13, ?110, ?112, ?114, ?116

CH PUMP RUNS

BOILER ON/OFF SWITCH

Next: &14, f99

DHW PUMP RUNS

BOILER ON/OFF SWITCH

Next: &15, f70

DHW FLOW RATE

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: &17, f23

WORCESTER 35 CDI

G.C. NUMBER 47 311 3

Next: &18, !f21

RE-IGNITION DELAY

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR TO MAX
DHW TEMPERATURE SELECTOR OFF

Next: &nff, f272

DHW MINIMUM BURNER PRESSURE CHECK

ATTACH U-GAUGE TO TH

Next: &12, !f333

EXTERNAL CONTROLS

Next: End

24 VOLT LINK

24 VOLT LINK

Next: End

CH PUMP

FLOW SWITCH

Next: End

AIR PRESSURE SWITCH TUBES

TUBE - POSITIVE AIR PRESSURE

Next: End

AIR PRESSURE SWITCH (NO AIR)

DHW SENSOR

Next: End

AIR PRESSURE SWITCH (NO AIR)

FLOW SWITCH

Next: End

AIR PRESSURE SWITCH (NO AIR)

PRIMARY SENSOR

Next: End

AIR FLOW DETECTOR

PROBE - AIR PRESSURE SENSING

Next: End

FLUE

FLUE

Next: End

FANS RUNS THEN STOPS

DHW SENSOR

Next: End

FAN VOLTAGE

PRIMARY SENSOR

Next: End

OVERHEAT THERMOSTAT

THERMOSTAT - OVERHEAT

Next: End

GAS VALVE

GAS VALVE

Next: End

BURNER PRESSURE, NO IGNITION

SPARK ELECTRODE GAP

Next: End

GAS VALVE (SOLENOID GV2)

GAS VALVE (SOLENOID GV2)

Next: End

GAS VALVE (SOLENOID GV1)

GAS VALVE (SOLENOID GV1)

Next: End

GAS VALVE 1 VOLTAGE

PCB - HEATRONIC

Next: End

GAS VALVE 2 VOLTAGE

PCB - HEATRONIC

Next: End

GAS VALVE INLET PRESSURE

INLET PRESSURE

Next: End

EXTERNAL CONTROLS (VOLTAGE IN)

Next: End

NO FAN OR IGNITION

24 VOLT LINK

Next: End

BURNER IGNITES AT HIGH PRESSURE

FLOW SWITCH

Next: End

BURNER IGNITES AT HIGH PRESSURE

PCB - HEATRONIC

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

BOILER BAFFLES AT HIGH FLAME

PCB - HEATRONIC

Next: End

DHW SENSOR MOUNTING

CLIP - THERMISTOR - DHW

Next: End

UNSATISFACTORY DHW TEMPERATURE

BURNER ASSEMBLY

Next: End

DHW SENSOR (MODULATION)

PRIMARY SENSOR

Next: End

PRIMARY HEAT EXCHANGER (FLUEWAYS)

PRIMARY HEAT EXCHANGER (FLUEWAYS)

Next: End

BOILER BAFFLES AT HIGH FLAME

FLUE

Next: End

DHW HEATS, BUT BOILER CYCLES

DHW SENSOR

Next: End

DHW HEATS, BUT BOILER CYCLES

PRIMARY SENSOR

Next: End

DHW PUMP LIMPET TEST

PUMP (NON-RETURN VALVE)

Next: End

NON-RETURN VALVE OPERATION

PUMP (NON-RETURN VALVE)

Next: End

CH NOISY, DHW NOISY

PUMP (NON-RETURN VALVE)

Next: End

CH NOISY, DHW NOISY

BYPASS ADJUSTMENT

Next: End

BOILER DOES NOT RAMP UP

PUMP (NON-RETURN VALVE)

Next: End

BOILER DOES NOT RAMP UP

BYPASS ADJUSTMENT

Next: End

BOILER DOES NOT RAMP UP

PRIMARY SENSOR

Next: End

BY-PASS ADJUSTMENT

PUMP (NON-RETURN VALVE)

Next: End

BOILER HEATS, RADIATOR IS COLD

BYPASS ADJUSTMENT

Next: End

BOILER HEATS, RADIATOR IS COLD

CH PUMP

Next: End

AUTO-FROST PROTECTION

PRIMARY SENSOR

Next: End

RE-IGNITION DELAY

PRIMARY SENSOR

Next: End

DHW OP BOILER DOES NOT MODULATE

DHW SENSOR

Next: End

PUMP AND FAN OVERRUNS

PRIMARY SENSOR

Next: End

APS FAULT

HARNESS

Next: End

NO FAN OR IGNITION

SPARK ELECTRODES

Next: End

SPARK ELECTRODE LEADS

SPARK ELECTRODE LEADS

Next: End

FAN STOPS RUNNING AFTER 30 SECONDS

TUBE - POSITIVE AIR PRESSURE

Next: End

FAN STOPS RUNNING AFTER 30 SECONDS

PROBE - AIR PRESSURE SENSING

Next: End

AIR PRESSURE SWITCH TUBES

FLUE

Next: End

FAN STOPS RUNNING AFTER 30 SECONDS

PRESSURE SWITCH - AIR

Next: End

NO LOW RATE

GAS VALVE

Next: End

PASSING MIXER

PLUMBING

Next: End

NOT LIGHTING

GAS VALVE

Next: End

BURNER IGNITES, BUT SPARKING CONTINUES

ELECTRODE ASSEMBLY - FLAME SENSING

Next: End

BURNER IGNITES, BUT SPARKING CONTINUES

FLAME SENSE ELECTRODE GAP

Next: End

GAS VALVE 3 RESISTANCE

GAS VALVE (MODULATING SOLENOID)

Next: End

BURNER IGNITES, PROVES, PRESSURE LOW

DHW SENSOR

Next: End

BURNER IGNITES, PROVES, PRESSURE LOW

PRIMARY SENSOR

Next: End

BURNER IGNITES, PROVES, PRESSURE LOW

INLET PRESSURE

Next: End

EXPANSION VESSEL

EXPANSION VESSEL

Next: End

DHW NOISY, CH NOISY

PUMP (NON-RETURN VALVE)

Next: End

DHW NOISY, CH NOISY

BYPASS ADJUSTMENT

Next: End

DHW NOISY, CH NOISY

PRIMARY SENSOR

Next: End

NON-RETURN VALVE

PUMP (NON-RETURN VALVE)

Next: End

DHW FILTER

DHW FILTER

Next: End

FLOW REGULATOR

REGULATOR - RED - FLOW

Next: End

FUSE F1

FUSE F1 (2 AMP)

Next: End

FUSE F1 RESISTANCE

MAIN POWER SUPPLY

Next: End

FUSE F2

FUSE F2 (1.25 AMP)

Next: End

TRANSFORMER

TRANSFORMER

Next: End

SYSTEM PRESSURE SWITCH MOUNTING

SYSTEM PRESSURE SWITCH MOUNTING

Next: End

DHW SENSOR

DHW SENSOR

Next: End

FLOW SWITCH

FLOW SWITCH

Next: End

PUMP PCB VOLTAGE

PCB - HEATRONIC

Next: End

SYSTEM PRESSURE

SYSTEM PRESSURE

Next: End

EXTERNAL CONTROLS

Next: End

CH PUMP RUNS

CH PUMP

Next: End

FLOW SWITCH

PCB - HEATRONIC

Next: End

FAN ASSEMBLY

FAN ASSEMBLY

Next: End

AIR PRESSURE SWITCH (NO AIR)

PCB - HEATRONIC

Next: End

AIR PRESSURE SWITCH

PRESSURE SWITCH - AIR

Next: End

FAN ASSEMBLY

FAN ASSEMBLY

Next: End

FAN VOLTAGE

PCB - HEATRONIC

Next: End

BURNER/INJECTOR

BURNER ASSEMBLY

Next: End

GAS VALVE INLET PRESSURE

GAS VALVE

Next: End

EXTERNAL CONTROLS (VOLTAGE IN)

Next: End

NO FAN OR IGNITION

PCB - HEATRONIC

Next: End

UNSATISFACTORY DHW TEMPERATURE

SECONDARY HEAT EXCHANGER

Next: End

BOILER DOES NOT MODULATE

PCB - HEATRONIC

Next: End

BOILER BAFFLES AT HIGH FLAME

FAN ASSEMBLY

Next: End

NON-RETURN VALVE OPERATION

DHW PUMP

Next: End

NON-RETURN VALVE OPERATION

SECONDARY HEAT EXCHANGER

Next: End

INCORRECT SELECTION SEE MODULE TEXT BELOW

INCORRECT SELECTION. CLICK OK AND READ TEXT

Next: End

PRIMARY HEAT EXCHANGER

HEAT EXCHANGER C/W O RINGS

Next: End

BY-PASS ADJUSTMENT

HEAT EXCHANGER C/W O RINGS

Next: End

BOILER DOES NOT RAMP UP

CH PUMP

Next: End

BOILER DOES NOT RAMP UP

PCB - HEATRONIC

Next: End

BOILER HEATS, RADIATOR IS COLD

Next: End

RE-IGNITION DELAY

PCB - HEATRONIC

Next: End

GAS VALVE VOLTAGE

GAS VALVE (MODULATING SOLENOID)

Next: End

AUTO-FROST PROTECTION

PCB - HEATRONIC

Next: End

MAIN PCB (LOCKOUT)

PCB (LOCKOUT)

Next: End

PUMP AND FAN OVERRUNS

PCB - HEATRONIC

Next: End

MAIN PCB (IGNITION TRANSFORMER)

MAIN PCB (IGNITION TRANSFORMER)

Next: End

SLOW

FAN ASSEMBLY

Next: End

DHW HEATS, BUT BOILER CYCLES

SECONDARY HEAT EXCHANGER

Next: End

MAIN PCB (FLAME SENSE)

PCB (FLAME SENSE)

Next: End

BURNER IGNITES, PROVES, PRESSURE LOW

PCB - HEATRONIC

Next: End

GAS VALVE INLET PRESSURE

GAS VALVE (MODULATING SOLENOID)

Next: End

CH NOISY, DHW NOISY

INCORRECT SELECTION. CLICK OK AND READ TEXT

Next: End

PUMP (NON-RETURN VALVE)

PUMP (NON-RETURN VALVE)

Next: End

CH PUMP

CH PUMP

Next: End

DHW NOISY, CH NOISY

PCB - HEATRONIC

Next: End

SECONDARY HEAT EXCHANGER

SECONDARY HEAT EXCHANGER

Next: End

MAIN PCB (BOILER ON/OFF SWITCH)

PCB - HEATRONIC (BOILER ON/OFF SWITCH)

Next: End

TRANSFORMER

PCB - HEATRONIC

Next: End

FLOW SWITCH OPERATION

PCB - HEATRONIC

Next: End

DHW PUMP

DHW PUMP

Next: End

PUMP CONTROL PCB

PCB - PUMP CONTROL

Next: End

SYSTEM PRESSURE SWITCH

SYSTEM PRESSURE SWITCH

Next: End

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS & IGNITION SPARKING

Next: p111

FAN RUNS FOR 2 SECONDS THEN STOPS

CHARACTERISTIC TEST FROM FAN RUNS & IGNITION SPARKING

Next: p113

FAN RUNS FOR LONGER THAN 30 SECONDS, BUT NO SPARKING

CHARACTERISTIC TEST FROM FAN RUNS & IGNITION SPARKING

Next: p115

FAN STOPS RUNNING AFTER 30 SECONDS, BUT NO SPARKING

CHARACTERISTIC TEST FROM FAN RUNS & IGNITION SPARKING

Next: p117

BURNER PRESSURE, NO IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND PRESSURE INCREASES TO MAX

Next: p163

BURNER IGNITES, BUT SPARKING CONTINUES

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND PRESSURE INCREASES TO MAX

Next: p337

BURNER IGNITES, PROVES, BUT PRESSURE LOW

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND PRESSURE INCREASES TO MAX

Next: p344

SPARKING PRESENT, BUT NO BURNER PRESSURE

CHARACTERISTIC TEST FROM DHW BURNER IGNITES AND PRESSURE INCREASES TO MAX

Next: p169

BURNER IGNITES AT HIGH PRESSURE

CHARACTERISTIC TEST FROM CH FAN RUNS AND BOILER IGNITES

Next: p171

NO FAN OR IGNITION

CHARACTERISTIC TEST FROM CH FAN RUNS AND BOILER IGNITES

Next: p173

CH NOISY, DHW NOISY

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p248

DHW OKAY, CH NOISY

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: !p250

BOILER DOES NOT RAMP UP

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p34

BOILER HEATS, RADIATOR IS COLD

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p36

CH NOISY, DHW NOISY

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: !p38

DHW OKAY, CH NOISY

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p40

BOILER BAFFLES AT HIGH FLAME

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p43

DHW HEATS, BUT BOILER CYCLES ON AND OFF (WATER RUNS HOT AND COLD)

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p45

DHW NOISY OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p47

BOILER DOES NOT MODULATE

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p49

DHW DOES NOT REACH TEMP AND RADIATORS HEAT WITH NO DEMAND

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p51

UNSATISFACTORY DHW TEMPERATURE, BURNER PRESSURE CORRECT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p53

07/12/2017 14:59:52 1711_2_50_1 09/01/2018 08:46:27

07/12/2017 15:34:50

Next: End

EXTERNAL CONTROLS (VOLTAGE IN)

BOILER ON/OFF SWITCH

Next: !p103, !f102

24 VOLT LINK

BOILER ON/OFF SWITCH

Next: p107, !f106

AIR PRESSURE SWITCH TUBES

Next: p120, !f119

FLOW SWITCH OPERATION

DISCONNECT THE PLUG

Next: p127, !f126

PRIMARY SENSOR (CALL)

Next: !p139, !f138

EXTERNAL CONTROLS (VOLTAGE IN)

BOILER ON/OFF SWITCH

Next: !p204, !f203

DHW FILTER

HOT WATER CIRCUIT DRAINED

Next: p67, !f66

PRIMARY SENSOR (AUTO-FROST)

DISCONNECT RED WIRES FROM PRIMARY SENSOR

Next: !p28, !f27

NON-RETURN VALVE OPERATION

BOILER ON/OFF SWITCH

Next: !p244, !f243

PRIMARY SENSOR (OVERRUN)

Next: !p30, !f29

NON-RETURN VALVE OPERATION

BOILER ON/OFF SWITCH

Next: !p254, !f253

NON-RETURN VALVE

BOILER ON/OFF SWITCH

Next: !p260, !f259

PRIMARY SENSOR (CALL)

Next: !p274, !f273

RESISTANCE APS USING TEST KIT

REMOVE APS FROM BOILER

Next: p321, !f328

DHW SENSOR (FULL DEMAND)

BOILER ON/OFF SWITCH OFF
ENSURE DHW IS COOL
DISCONNECT YELLOW WIRE FROM DHW SENSOR

Next: p348, !f349

NON-RETURN VALVE

BOILER ON/OFF SWITCH

Next: !p57, !f56

24 VOLT DC SUPPLY

BOILER ON/OFF SWITCH

Next: p72, f71

BOILER ON/OFF SWITCH VOLTAGE

BOILER ON/OFF SWITCH

Next: p74, f73

FUSE F1 RESISTANCE

REMOVE LOWER FRONT FACIA PANEL
REMOVE FUSE F1 FROM MAIN PCB

Next: p76, !f75

SYSTEM PRESSURE SWITCH RESISTANCE

BOILER ON/OFF SWITCH OFF
DISCONNECT BLACK WIRES FROM SYSTEM PRESSURE MICROSWITCH

Next: p86, f85

SYSTEM PRESSURE SWITCH MOUNTING

Next: p88, !f87

PUMP PCB VOLTAGE OUT

BOILER ON/OFF SWITCH

Next: !p96, !f95

EXTERNAL CONTROLS (VOLTAGE OUT)

BOILER ON/OFF SWITCH

Next: p101, f100

CH PUMP VOLTAGE

BOILER ON/OFF SWITCH

Next: !p105, f104

FLOW SWITCH OPERATION

DISCONNECT THE PLUG

Next: !p109, !f108

AIR PRESSURE SWITCH (NO AIR)

DISCONNECT GREEN WIRES FROM THE AIR PRESSURE SWITCH

Next: p121, f118

DHW SENSOR (CALL)

BOILER ON/OFF SWITCH OFF
ENSURE DHW IS COOL
DISCONNECT YELLOW WIRE FROM DHW SENSOR

Next: p135, !f134

OVERHEAT THERMOSTAT RESISTANCE

BOILER ON/OFF SWITCH OFF
DISCONNECT ONE ORANGE WIRE FROM OVERHEAT THERMOSTAT

Next: !p280, !f140

AIR PRESSURE SWITCH (AIR DETECT)

BOILER ON/OFF SWITCH

Next: p305, f320

AIR FLOW SENSOR

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p131, !f130

DHW SENSOR (CALL)

BOILER ON/OFF SWITCH OFF
ENSURE DHW IS COOL
DISCONNECT YELLOW WIRE FROM DHW SENSOR

Next: p123, !f122

FAN (VOLTAGE)

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: !p125, f124

PRIMARY SENSOR (CALL)

Next: !p129, !f128

FLUE

Next: !p133, !f132

FAN (VOLTAGE)

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: !p137, f136

SPARK ELECTRODE GAP

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: !p176, !f175

GAS VALVE 2 RESISTANCE

BOILER ON/OFF SWITCH OFF
DISCONNECT THE MULTI-PLUG CONNECTOR FROM THE GAS VALVE

Next: p182, !f181

FLOW SWITCH OPERATION

DISCONNECT THE PLUG

Next: p208, !f207

EXTERNAL CONTROLS (VOLTAGE OUT)

BOILER ON/OFF SWITCH

Next: p202, f201

GAS VALVE 1 RESISTANCE

BOILER ON/OFF SWITCH OFF
DISCONNECT THE MULTI-PLUG CONNECTOR FROM THE GAS VALVE

Next: p184, !f183

GAS VALVE 1 VOLTAGE

BOILER ON/OFF SWITCH

Next: p196, !f195

GAS VALVE 2 VOLTAGE

BOILER ON/OFF SWITCH

Next: p198, !f197

GAS VALVE INLET PRESSURE

BOILER ON/OFF SWITCH

Next: !p200, !f199

24 VOLT LINK

BOILER ON/OFF SWITCH

Next: !p206, !f205

GAS VALVE VOLTAGE

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR TO MAX
DHW TEMPERATURE SELECTOR OFF

Next: !p279, !f209

PRIMARY HEAT EXCHANGER FLUE WAYS

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p226, !f225

DHW SENSOR (MODULATION)

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR MAX

Next: p230, !f229

DHW PUMP LIMPET TEST

Next: p242, f241

PRIMARY SENSOR (CALL)

Next: !p224, !f223

FLUE

Next: !p228, !f227

PRIMARY SENSOR (CALL)

Next: p334, !f231

NON-RETURN VALVE OPERATION

BOILER ON/OFF SWITCH

Next: !p246, !f245

CH PUMP LIMPET TEST

Next: p252, f251

BY-PASS ADJUSTMENT

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: !p256, !f255

BY-PASS ADJUSTMENT

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p262, !f261

PRIMARY SENSOR (MODULATION)

Next: p264, !f263

NON-RETURN VALVE

BOILER ON/OFF SWITCH

Next: !p266, !f265

CH PUMP LIMPET TEST

Next: !p270, !f269

RESISTANCE APS HARNESS

REMOVE BOTH SPADE CONNECTORS (GREEN WIRES) FROM APS.
REMOVE CONNECTOR ST16 FROM PCB.

Next: p307, !f306

SPARK ELECTRODES

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p308, !f309

SPARK ELECTRODE LEAD CONDITION AND CONTINUITY

REMOVE THE IGNITION LEADS FROM THE ELECTRODES AND PCB.

Next: !p310, !f311

AIR PRESSURE SWITCH TUBES

Next: p323, !f322

AIR FLOW SENSOR

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p324, !f325

FLUE

Next: !p326, !f327

DHW BOILER TEMPERATURE OUTPUT (MIXER TAP PASSING)

{MAINSPOWERON}

Next: !p335, !f336

DHW MINIMUM BURNER PRESSURE CHECK

ATTACH U-GAUGE TO TH

Next: p339, !f338

FLAME SENSE ELECTRODE

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p341, !f340

CH PUMP LIMPET TEST

Next: p258, f257

FLAME SENSE ELECTRODE GAP

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: !p342, !f343

GAS VALVE 3 RESISTANCE

BOILER ON/OFF SWITCH

Next: p346, !f345

GAS VALVE 3 VOLTAGE

BOILER ON/OFF SWITCH

Next: p352, f347

PRIMARY SENSOR (CALL)

Next: !p350, !f351

GAS VALVE INLET PRESSURE

BOILER ON/OFF SWITCH

Next: !p353, !f354

BY-PASS ADJUSTMENT

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p268, !f267

CH PUMP LIMPET TEST

Next: p55, f54

FAN VOLTAGE (FULL SPEED)

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: p212, !f211

DHW SENSOR MOUNTING

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p214, !f213

CH OPERATION

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR TO MAX
DHW TEMPERATURE SELECTOR OFF

Next: p216, ?247, ?249

DHW SENSOR (MODULATION)

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR MAX

Next: p222, !f275

GAS RATE

Next: !p220, !f219

BY-PASS ADJUSTMENT

BOILER ON/OFF SWITCH OFF
CH TEMPERATURE SELECTOR OFF
DHW TEMPERATURE SELECTOR OFF

Next: p59, !f58

PRIMARY SENSOR (MODULATION)

Next: p61, !f60

NON-RETURN VALVE

BOILER ON/OFF SWITCH

Next: !p65, !f64

FLOW REGULATOR

HOT WATER CIRCUIT DRAINED

Next: !p69, !f68

PUMP RELAY VOLTAGE

BOILER ON/OFF SWITCH

Next: p84, f83

FUSE F2 RESISTANCE

REMOVE LOWER FRONT FACIA PANEL
REMOVE FUSE F2 FROM MAIN PCB

Next: p80, !f79

MAINS POWER SUPPLY

REMOVE LOWER FRONT FACIA PANEL

Next: !p78, !f77

TRANSFORMER RESISTANCE

REMOVE TRANSFORMER FROM THE PCB (THIS WILL REQUIRE THE REMOVAL OF THE METAL BACK OF THE CONTROL BOX)

Next: !p82, !f81

DHW PUMP VOLTAGE

BOILER ON/OFF SWITCH

Next: !p94, f93

DHW SENSOR (CALL)

BOILER ON/OFF SWITCH OFF
ENSURE DHW IS COOL
DISCONNECT YELLOW WIRE FROM DHW SENSOR

Next: p90, !f89

SYSTEM PRESSURE

Next: !p98, !f97

FLOW SWITCH OPERATION

DISCONNECT THE PLUG

Next: !p92, !f91

System Information

Total Tests: 255

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control