XSol Diagnostic System

Interactive Test Sequence Navigator

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:

VAILLANT TURBOMAX PLUS VUW 837E (VUW GB 362/2-5)

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

VAILLANT TURBOMAX PLUS VUW 837E (VUW GB 362/2-5)

GC NO. 47 044 28

Next: &1054, !f2

OPERATIONAL SEQUENCE

Next: &364, !f189

DHW FLOW RATE

Next: &650, f6

PUMP RUNS (CH DEMAND)

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: &39, f321

DOES THE FAN RUN

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: &53, f40

ELECTRODE SPARKING

ON/OFF SWITCH IN ON POSITION

Next: &69, f54

BURNER ESTABLISHED

ON/OFF SWITCH IN ON

Next: &96, ?74, ?577, ?1040, ?1050

DHW DEMAND

Next: &102, f836

DHW MAXIMUM BURNER PRESSURE

ON/OFF SWITCH IN ON

Next: &1056, ?103, ?105, ?309

DHW WARMSTART OPERATION

RUN THE HOT TAP UNTIL THE WATER IS COLD
TURN HOT WATER TAP OFF

Next: &148, f145

CH OPERATION

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: &173, ?149, ?151, ?183

BURNER MODULATION

ON/OFF SWITCH IN ON

Next: &179, f174

PUMP OVERRUN

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: &181, !f180

ANTI-CYCLE

ON/OFF SWITCH IN ON

Next: &nff, !f182

ENHANCED FAULT CODES

Next: &5, !f365

F11/F1 FAULT CODE/ RETURN THERMISTOR

OUTSIDE MODEL

Next: &nff, f367

F10/F0 FAULT CODE/ FLOW THERMISTOR

OUTSIDE MODEL

Next: &nff, f375

F62 FAULT CODE

OUTSIDE MODEL

Next: &nff, f383

F20 / F22 / F23 / F24 FAULT CODE

OUTSIDE MODEL

Next: &nff, f432

F27 FAULT CODE

OUTSIDE MODEL

Next: &nff, f466

F28 / F29 FAULT CODE

OUTSIDE MODEL

Next: &nff, f476

F42 / F43 / F60 / F63 / F64 / F65 / F67 FAULT CODE

OUTSIDE MODEL

Next: &nff, f500

F61 FAULT CODE

OUTSIDE MODEL

Next: &nff, f507

F66 FAULT CODE

OUTSIDE MODEL

Next: &nff, f517

FUSE FURTHER INVESTIGATION (DUMMY)

OUTSIDE MODEL

Next: &nff, f621

OBSERVATION DISPLAY ILLUMINATES

ON / OFF SWITCH ON

Next: &13, f652

HOW TO SET MULTIMETER TO DIODE

THE IMAGES BELOW SHO

Next: &nff, !f705

INFORMATION PAGE FAN

Next: &3, !f1055

DHW OPERATION

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MIN
DHW TEMP SELECTOR TO MAX

Next: &144, ?1057, ?1059, ?1061, ?1063, ?1065

DHW FLOW FLOW RATE

LIMITER

Next: End

NO PRESSURE SIT VALVE

GAS VALVE AND PCB

Next: End

LOW PRESSURE

GAS VALVE INLET PRESSURE

Next: End

F62 - SENDING VOLTAGE TO GAS VALVE AFTER DEMAND 2

PCB

Next: End

F62

GAS SECTION

Next: End

F62 FAULT CODE - STUCK IN FAULT

PCB

Next: End

F61 FAULT CODE

GAS VALVE AND PCB

Next: End

F61

GAS VALVE AND PCB

Next: End

FLAME SENSE

WIRING HARNESS CABLE TREE

Next: End

FLAME SENSE BURNER ESTABLISHED

IGNITION C/W MONITORING ELECTRODE

Next: End

BURNER

BURNER CHAMBER GROUP

Next: End

BURNER IGNITES SPARKING CONTINUES THEN LOCKOUT

TUBE - DISTRIBUTOR (BURNER INJECTOR)

Next: End

BURNER ESTABLISHED

IGNITION C/W MONITORING ELECTRODE - GAP

Next: End

BLANK FOR FAN INFO PAGE

Z REDIRECT

Next: End

DHW TOO HOT

SENSOR - NTC

Next: End

DHW TOO HOT

SET - 3 OFF KNOBS - GREY

Next: End

WEAK OR SLOW CAUSING KETTLING

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

DHW OPERATION

AUTOMATIC BY-PASS

Next: End

DHW COOL RADIATORS HOT

PCB

Next: End

WEAK OR SLOW CAUSING POOR DHW TEMPERATURE RISE

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

DHW OPERATION

TUBE - DISTRIBUTOR (BURNER INJECTOR)

Next: End

DHW OPERATION

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: End

DHW OPERATION

FLUE

Next: End

DHW MAXIMUM BURNER PRESSURE

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: End

DHW FLOW RATE

FILTER - WATER

Next: End

DHW MAXIMUM BURNER PRESSURE

FLUE

Next: End

WARMSTART OPERATION

SENSOR - NTC - WARMSTART

Next: End

BOILER HEATS BUT RADS COLD

AUTOMATIC BY-PASS

Next: End

CH OPERATION

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

CH NOISY DHW OK

AUTOMATIC BY-PASS

Next: End

BURNER MODULATION

SENSOR - NTC

Next: End

PUMP OVERRUN

PCB

Next: End

ANTI-CYCLE

PCB

Next: End

OPERATIONAL SEQUENCE

SYSTEM CHECKS

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY

Next: End

HONEYWELL VALVE

GAS VALVE INLET PRESSURE

Next: End

NO BURNER PRESSURE

SYSTEM PRESSURE

Next: End

BURNER ESTABLISHED

GAS VALVE INLET PRESSURE

Next: End

BURNER EST

WATER PRESSURE SWITCH

Next: End

BURNER ESTABLISH

HARNESS GAS VALVE AND WATER PRESSURE SWITCH

Next: End

HONEYWELL ELECTRICAL

GAS SECTION

Next: End

BURNER DROPS OUT

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: End

BURNER DROPS OUT

VENTURI

Next: End

BURNER DROPS OUT

FAN

Next: End

BURNER DROPS OUT

TUBE - FLEXIBLE

Next: End

BURNER DROPS OUT

FLUE

Next: End

CH OP

PCB

Next: End

FAULT CODES

Z REDIRECT

Next: End

F11/1 FAULT CODE

SENSOR - NTC

Next: End

F0/F10 FAULT CODE

SENSOR - NTC

Next: End

F62 GAS VALVE

GAS SECTION

Next: End

F62 - SENDING VOLTAGE TO GAS VALVE AFTER DEMAND

PCB

Next: End

F20 - STUCK IN FAULT

PCB

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

F20 RUNNING SLOW

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

FAN RUNS (CH DEMAND)

TUBE - FLEXIBLE

Next: End

F20 FAULT CODE

SENSOR - NTC

Next: End

F20 FAULT CODE

SENSOR - NTC

Next: End

OVERHEAT3

PCB

Next: End

FAN RUNS (CH DEMAND)

VENTURI

Next: End

F27 FAULT CODE

WIRING HARNESS CABLE TREE

Next: End

F27 FAULT CODE

IGNITION C/W MONITORING ELECTRODE

Next: End

FAN RUNS (CH DEMAND)

FLUE

Next: End

F28 FAULT CODE

IGNITION C/W MONITORING ELECTRODE

Next: End

F28 FAULT CODE

IGNITION C/W MONITORING ELECTRODE - GAP

Next: End

FAN RUNS (CH DEMAND)

PCB

Next: End

F60 FAULT CODE

WIRING HARNESS CABLE TREE

Next: End

F60 FAULT CODE

Z REDIRECT

Next: End

F66 FAULT CODE

PCB

Next: End

HARNESS FAN

WIRING HARNESS CABLE TREE

Next: End

F20 - NO POWER TO PUMP

PCB

Next: End

ELECTRODE SPARKING

TUBE - FLEXIBLE

Next: End

ELECTRODE SPARKING

VENTURI

Next: End

ELECTRODE SPARKING

FLUE

Next: End

APS NC

WIRING HARNESS CABLE TREE

Next: End

ELECTRODE SPARKING

IGNITION C/W MONITORING ELECTRODE

Next: End

ELECTRODE SPARKING

IGNITION C/W MONITORING ELECTRODE - GAP

Next: End

BURNER ESTABLISHED ELECTRICAL

GAS SECTION

Next: End

NO PRESSURE SWITCH

GAS SECTION

Next: End

NO PRESSURE SWITCH

GAS VALVE INLET PRESSURE

Next: End

FUSE INVESTIGATION

TRANSFORMER

Next: End

FUSE INVESTIGATION

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

FUSE INVESTIGATION

FAN

Next: End

FUSE INV SIT

GAS SECTION

Next: End

FUSE INV

WATER PRESSURE SWITCH

Next: End

FUSE INV NO LWPS

CABLE - CONNECTING - GAS SECTION - SIT

Next: End

NO DISPLAY

MAINS FUSE

Next: End

NO DISPLAY

SET - 10 OFF FUSES 2.0AT

Next: End

NO DISPLAY

SET - 10 FUSES 1.25AT

Next: End

NO DISPLAY

PCB

Next: End

DISPLAY ILLUMINATES VOLTAGE TO DISPLAY

PCB

Next: End

EXTERNAL CONTROLS (VOLTAGE IN)

Next: End

PUMP RUNS (CH DEMAND)

SENSOR - NTC

Next: End

PUMP RUNS (CH DEMAND)

SENSOR - NTC

Next: End

BURNER MODULATION

SET - 3 OFF KNOBS - GREY

Next: End

HONEYWELL NO VOLTS TO GV R203 OK

CABLE - CONNECTING - GAS SECTION - HONEYWELL

Next: End

SETTING MULTIMETER TO DIODE

Z REDIRECT

Next: End

F20 FAULT CODE DHW OPERATION

HEAT EXCHANGER

Next: End

F20 FAULT CODE MINIMUM

GAS VALVE INLET PRESSURE

Next: End

F20 FAULT CODE MAXIMUM

GAS VALVE INLET PRESSURE

Next: End

F20 FAULT CODE CH OPERATION

AUTOMATIC BY-PASS

Next: End

ELECTRODE SPARKING

SWITCH - FAN PROVING - HUBA

Next: End

DHW FLOW RATE

VALVE 3/4IN X 15

Next: End

NO PRESSURE HAS LWPS

GAS VALVE AND PCB

Next: End

DHW DEMAND

AQUA SENSOR - IMPELLOR ONLY

Next: End

DHW DEMAND NO VOLTAGE TO AQUA SENSOR

PCB

Next: End

DHW MAXIMUM BURNER PRESSURE

GAS SECTION

Next: End

F20 FAULT CODE GAS MODULATION (DHW)

GAS SECTION

Next: End

F20 FAULT CODE GV MODUREG

WIRING HARNESS CABLE TREE

Next: End

F20 FAULT CODE

KIT - JUMPER LINK

Next: End

GV MOD

WIRING HARNESS CABLE TREE

Next: End

DHW MAXIMUM BURNER PRESSURE

SENSOR - NTC

Next: End

DHW MAXIMUM BURNER PRESSURE

KIT - JUMPER LINK

Next: End

DHW MAXIMUM BURNER PRESSURE

GAS VALVE INLET PRESSURE

Next: End

FUSE INV HONEYWELL HARNESS SHORT

GAS SECTION

Next: End

FUSE INV HONEYWELL HARNESS OK

GAS SECTION

Next: End

FUSE INV DIODE FAILURE

CABLE - CONNECTING - GAS SECTION - HONEYWELL

Next: End

R203 RESISTOR

GAS VALVE AND PCB

Next: End

NO PRESSURE SWITCH

PCB

Next: End

RESISTOR R203

GAS VALVE HARNESS AND PCB

Next: End

LOW PRESSURE

GAS VALVE ADJUSTMENT

Next: End

F62

F62 NO FAULT FOUND

Next: End

F62 - RETURNS TO FAULT BEFORE IGNITION 1

PCB

Next: End

F62 - NOT SHUTTING DOWN 1

GAS SECTION

Next: End

F61 GAS VALVE

PCB

Next: End

F61

PCB

Next: End

BURNER IGNITES SPARKING CONTINUES THEN BOILER LOCKS OUT

PCB

Next: End

BURNER ESTABLISHED

TUBE - DISTRIBUTOR (BURNER INJECTOR)

Next: End

DHW TOO HOT

GAS VALVE ADJUSTMENT

Next: End

DHW TOO HOT

PCB

Next: End

DHW NOISY OPERATION KETTLES

HEAT EXCHANGER - SECONDARY

Next: End

DHW OPERATION

HEAT EXCHANGER

Next: End

DHW OPERATION

VALVE - DIVERTER

Next: End

DHW COOL RADIATORS HOT

MOTOR - DIVERTER VALVE

Next: End

DHW COLD RADIATORS COLD

HEAT EXCHANGER - SECONDARY

Next: End

DHW OPERATION

FAN

Next: End

SCALED

HEAT EXCHANGER - SECONDARY

Next: End

DHW MAXIMUM BURNER PRESSURE

FAN

Next: End

WARMSTART

PCB

Next: End

BOILER HEATS BUT RADS COLD

VALVE - DIVERTER

Next: End

BOILER HEATS BUT RADS COLD

Next: End

CH NOISY DHW OKAY

Next: End

BURNER MODULATION

GAS SECTION

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL 10 LITRE - SQUARE

Next: End

BURNER ESTABLISHED MECHANICAL

GAS SECTION

Next: End

BURNER DROPS OUT

SWITCH - FAN PROVING - HUBA

Next: End

PUMP RUNS (CH DEMAND)

Next: End

PUMP RUNS

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

PUMP RUNS

INTEGRAL HEATING CONTROLS

Next: End

CH OP

MOTOR - DIVERTER VALVE

Next: End

F11-F1 RETEST BOILER

DIRECTION CHOICE OR CONTINUE

Next: End

F11/F1 FAULT CODE

PCB

Next: End

SENSOR TEMP RETURN F11/1 FAULT CODE

WIRING HARNESS CABLE TREE

Next: End

F10-F0 RETEST BOILER

DIRECTION CHOICE OR CONTINUE

Next: End

F1/F2 FAULT CODES

PCB

Next: End

SENSOR PRIMARY F0/F10 FAULT CODE

WIRING HARNESS CABLE TREE

Next: End

F62 FAULT CODE

F62 NO FAULT FOUND

Next: End

F62 - RETURNS TO FAULT BEFORE IGNITION

PCB

Next: End

F62 - NOT SHUTTING DOWN

GAS SECTION

Next: End

F20 FAULT CODE FLOW SENSOR

WIRING HARNESS CABLE TREE

Next: End

F20 FAULT CODE RETURN SENSOR

WIRING HARNESS CABLE TREE

Next: End

F20 FAULT CODE

HEAT EXCHANGER - SECONDARY

Next: End

F27 FAULT CODE

Z REDIRECT

Next: End

FAN RUNS (CH DEMAND)

SWITCH - FAN PROVING - HUBA

Next: End

F28 FAULT CODE

PCB

Next: End

F28 FAULT CODE

Z REDIRECT

Next: End

F27 FAULT CODE

PCB

Next: End

F60 FAULT CODE

PCB

Next: End

F61 GAS VALVE

GAS SECTION

Next: End

FAN RUNS (CH DEMAND)

FAN

Next: End

F66 FAULT CODE

COVER - DISPLAY

Next: End

F20 NOT RUNNING

PUMP ASSEMBLY - GRUNDFOS VP5

Next: End

ELECTRODE SPARKING NO VOLTAGE TO APS

PCB

Next: End

ELECTRODE SPARKING

PCB

Next: End

NO PRESSURE SWITCH

GAS VALVE

Next: End

FUSE INVESTIGATION - FAN

WIRING HARNESS CABLE TREE

Next: End

SIT VALVE

FUSE INVESTIGATION NO FAULT

Next: End

FUSE INV

HARNESS GAS VALVE AND WATER PRESSURE SWITCH

Next: End

NO BURNER PRESSURE NO LWPS

CABLE - CONNECTING - GAS SECTION - SIT

Next: End

NO DISPLAY

Next: End

MAINS FUSE

Z REDIRECT

Next: End

FUSE F1

Z REDIRECT

Next: End

FUSE F2

Z REDIRECT

Next: End

NO DISPLAY

TRANSFORMER

Next: End

NO DISPLAY

COVER - DISPLAY

Next: End

FLOW SENSOR

WIRING HARNESS CABLE TREE

Next: End

PUMP RUNS (CH DEMAND)

PCB

Next: End

RETURN SENSOR

WIRING HARNESS CABLE TREE

Next: End

BURNER MODULATION

PCB

Next: End

HONEYWELL MECHANICAL FAULT

GAS SECTION

Next: End

F20 FAULT CODE MINIMUM

GAS VALVE ADJUSTMENT

Next: End

F20 INVESTIGATION

OVERHEAT

Next: End

F20 FAULT DURING OP

PCB

Next: End

F20 FAULT CODE

Next: End

F20 FAULT CODE NOT SHUTTING DOWN

PCB

Next: End

ELECTRODE SPARKING RUNNING SLOW

FAN

Next: End

NO PRESSURE HAS LWPS

PCB

Next: End

DHW DEMAND

PCB

Next: End

DHW DEMAND

SENSOR - HALL

Next: End

F20 FAULT CODE - MODULATION VOLTAGE

PCB

Next: End

F20 FAULT CODE MAXIMUM

GAS VALVE ADJUSTMENT

Next: End

DHW MAXIMUM BURNER PRESSURE

PCB

Next: End

GAS MODULATION (DHW)

GAS SECTION

Next: End

FUSE INV HONEYWELL

CABLE - CONNECTING - GAS SECTION - HONEYWELL

Next: End

HONEYWELL GAS VALVE

FUSE INVESTIGATION NO FAULT

Next: End

HONEYWELL NO VOLTS R203 OK

PCB

Next: End

R203 RESISTER

GAS VALVE HARNESS AND PCB

Next: End

BOILER RETURNS TO FAULT CODE BEFORE IGNITION

CHARACTERISTIC TEST FROM OBSERVATION BURNER SHUT OFF

Next: !p1023

BURNER STAYS ALIGHT AFTER DEMAND ENDS OR FAULT CODE OCCURS AFTER DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BURNER SHUT OFF

Next: p1025

PRESSURE INCREASES BUT FLAME BAFFLES

CHARACTERISTIC TEST FROM DHW MAXIMUM BURNER PRESSURE

Next: p104

BURNER IGNITES WITH CORRECT BP BUT SPARKING CONTINUES AND BOILER LOCKS OUT

CHARACTERISTIC TEST FROM BURNER ESTABLISHED

Next: p1041

PRESSURE DOES NOT REACH MAXIMUM

CHARACTERISTIC TEST FROM DHW MAXIMUM BURNER PRESSURE

Next: p899

BURNER PRESSURE CORRECT, SPARKING PRESENT BUT BURNER FAILS TO IGNITE

CHARACTERISTIC TEST FROM BURNER ESTABLISHED

Next: p1051

BURNER BAFFLES OUT DURING OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1058

TEMPERATURE RISE UNSATISFACTORY - RADIATORS REMAIN COOL WITH NO CH DEMAND

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1060

TEMPERATURE RISE UNSATISFACTORY - RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1062

BOILER NOISY / KETTLING DURING OPERATION

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1064

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1066

CH NOISY, DHW OK

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p150

BOILER HEATS, BUT RADS COLD

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: p152

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM CENTRAL HEATING OPERATION

Next: !p184

PRESSURE INCREASES BUT FLAME DROPS OUT THEN IMMEDIATELY RE-IGNITES

CHARACTERISTIC TEST FROM DHW MAXIMUM BURNER PRESSURE

Next: p310

BOILER RETURNS TO FAULT CODE BEFORE IGNITION

CHARACTERISTIC TEST FROM OBSERVATION BURNER SHUT OFF

Next: !p426

BURNER STAYS ALIGHT AFTER DEMAND ENDS OR FAULT CODE OCCURS AFTER DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BURNER SHUT OFF

Next: p428

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH (AIR DETECT)

Next: p560

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH (AIR DETECT)

Next: !p559

BURNER PRESSURE PRESENT BUT BELOW 2MB

CHARACTERISTIC TEST FROM BURNER ESTABLISHED

Next: p578

ONLY MINIMUM PRESSURE IS INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAXIMUM AND MINIMUM

Next: p723

MAXIMUM PRESSURE INCORRECT OR BOTH MAX AND MIN INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAXIMUM AND MINIMUM

Next: p725

NO BURNER PRESSURE

CHARACTERISTIC TEST FROM BURNER ESTABLISHED

Next: p273

CH NOISY OPERATION / OVERHEATS OR CUTS OUT QUICKLY

CHARACTERISTIC TEST FROM TEMPERATURE CH OPERATION DIFFERENTIAL AND RUN TO MAX

Next: p776

DIFFERENTIAL OK BUT BOILER RETURNS TO FAULT CODE BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM TEMPERATURE CH OPERATION DIFFERENTIAL AND RUN TO MAX

Next: !p768

DIFFERENTIAL OK BUT BOILER CONTINUES TO HEAT PAST 88°C

CHARACTERISTIC TEST FROM TEMPERATURE CH OPERATION DIFFERENTIAL AND RUN TO MAX

Next: !p780

26/05/2021 10:53:55 2105_1_50_1 14/07/2021 11:24:18

08/06/2021 06:25:19

Next: End

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p1002, !f1003

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: p1020, !f1028

GAS VALVE TYPE

Next: p1034, f1037

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p1038, !f1039

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: p1069, !f1070

BY-PASS (INTERNAL) OPENS CORRECTLY

ENSURE THERE IS NO FLOW AROUND THE HEATING SYSTEM
I.E. TURN OFF ALL RADIATORS

Next: !p1077, !f1078

VOLTAGE DIVERTER MOTOR AT PCB

{GAINPCBACS}
DISC

Next: !p1081, !f1082

WARMSTART RESISTANCE

REMOVE THE CONNECTOR FROM THE WARM STAT WHICH IS SITUATED ADJACENT TO THE PUMP

Next: !p146, !f147

DIVERTER VALVE MOTOR OPERATION

REMOVE, BY UNSCREWING THE RETAINING RING,
THE DIVERTER VALVE MOTOR FROM THE DIVERTER VALVE

Next: !p161, f353

GAS VALVE MODULATION VOLTAGE (NO MODULATION)

{GAINPCBACS}
ON/OFF SWITCH IN THE ON POSITION

Next: !p175, f176

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: p688, !f178

GAS VALVE VOLTAGE

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p276, f277

R203 RESISTANCE

{GAINPCBACS}

Next: !p994, f995

EXTERNAL CONTROLS (VOLTAGE OUT)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING

Next: p322, f323

EXTERNAL CONTROLS (VOLTAGE IN)

{GAINPCBACS}

Next: !p324, !f674

DISCONNECT INTEGRAL CONTROLS

REMOVE THE INTEGRAL

Next: !p332, f678

VOLTAGE DIVERTER MOTOR AT PCB

{GAINPCBACS}
DISC

Next: !p354, !f359

LOCKOUT RESET RETURN THERMISTOR

ENSURE NO DEMAND

Next: !p368, f369

RETURN SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p370, f371

RETURN STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p372, !f373

LOCKOUT RESET FLOW THERMISTOR

ENSURE NO DEMAND

Next: !p376, f377

FLOW SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p378, f379

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p380, !f381

LOCKOUT RESET F 62

ENSURE NO DEMAND

Next: p1007, !f1029

AIR PRESSURE SWITCH (NORMALLY OPEN)

{GAINPCBACS}

Next: p41, f42

APS TUBES CONDITION

LOCATE THE AIR PRESS

Next: p43, !f44

FAULT CODE RESET

ENSURE BOILER IS COOL
ENSURE NO DEMAND

Next: p433, !f434

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p441, !f442

RETURN STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p445, !f446

TEMPERATURE CH OPERATION DIFFERENTIAL

ON/OFF SWITCH IN ON

Next: !p461, !f758

OBSERVATION BOILER RESET F27

ENSURE NO DEMAND

Next: !p467, f469

FLAME SENSE ELECTRODE WIRING HARNESS CONTINUITY

Next: p470, !f471

ELECTRODE SPARKING (FAULT CODE)

REMOVE COMBUSTION CHAMBER DOOR
ON/OFF SWITCH IN ON POSITION

Next: !p497, f492

ELECTRODE/LEAD RESISTANCE

REMOVE BOTH SPARK LEADS FROM THE PCB

Next: p493, !f494

INSPECTION WIRING HARNESS

{GAINPCBACS}

Next: p501, !f502

OBSERVATION DISCONNECT X2

{GAINPCBACS}
REMOVE THE LEFT MOLEX CONNECTOR ON THE TOP LEFT OF THE PCB MARKED X2 AND MAKE SAFE

Next: !p508, f1030

VOLTAGE MAIN PCB TO DISPLAY PCB

{GAINPCBACS}
DISCONNECT THE DISPLAY PCB FROM THE FRONT OF THE BOILER FASCIA

Next: !p522, !f519

AIR PRESSURE SWITCH (AIR DETECT)

{GAINPCBACS}

Next: p572, ?556, ?558

PUMP VOLTAGE

ON/OFF SWITCH IN ON

Next: !p547, !f548

GAS VALVE VOLTAGE

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p599, f600

DHW ISOLATING VALVE

Next: p7, !f8

R203 RESISTANCE

{GAINPCBACS}

Next: !p1000, f1001

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p644, !f606

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p832, !f833

RESISTANCE TRANSFORMER

DISCONNECT CONNECTOR X3 FROM THE PCB

Next: p622, !f623

RESISTANCE FAN

GAIN ACCESS TO THE FAN
DISCONNECT THE WIRES FROM THE FAN MOTOR AND EARTH POINTS

Next: !p627, !f628

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: p645, !f641

MAINS POWER SUPPLY

{GAINPCBACS}

Next: p653, f654

RESISTANCE FUSE MAINS

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p655, f656

FURTHER INVESTIGATION FUSE

Next: !p657, !f658

FURTHER INVESTIGATION FUSE

Next: !p661, !f662

FURTHER INVESTIGATION FUSE

Next: !p665, !f666

TRANSFORMER (VOLTAGE IN)

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION

Next: !p669, !f670

FLOW SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p679, f680

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p681, !f682

RETURN STAT RESISTANCE

REMOVE THE CONNECTOR

Next: !p685, !f687

VOLTAGE PCB TO AQUA SENSOR (PERMANENT)

{GAINPCBACS}

Next: p842, !f847

INSPECTION IMPELLOR

DHW CIRCUIT DRAINED AND ISOLATED

Next: !p845, !f846

INSPECTION PCB JUMPER

{GAINPCBACS}

Next: !p949, !f950

FLOW STAT RESISTANCE

REMOVE THE CONNECTOR

Next: p959, !f960

DIODE GAS VALVE HARNESS

REMOVE THE GAS VALVE

Next: p974, !f981

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p977, !f978

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p996, !f997

GAS VALVE TYPE

Next: p418, f1019

OBSERVATION BURNER SHUT OFF

RUN HOT WATER TAP UNTIL WATER COOL THEN TURN TAP OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: !p1021, ?1022, ?1024

VOLTAGE GAS VALVE AT DEMAND END

{GAINPCBACS}
RUN

Next: !p1026, !f1027

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p1035, !f1036

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT PANEL

Next: p117, !f118

FLAME SENSE ELECTRODE WIRING HARNESS CONTINUITY

Next: p1042, !f1043

FLAME SENSE ELECTRODE CONDITION AND POSITION

DISCONNECT THE LEAD FROM THE FLAME SENSE ELECTRODE

Next: p1044, !f1045

INSPECTION BURNER

REMOVE THE BURNER ASSEMBLY

Next: p1046, !f1047

INSPECTION BURNER MANIFOLD

REMOVE BURNER MANIFOLD

Next: !p1048, !f1049

SPARK ELECTRODE GAP

REMOVE THE COMBUSTION CHAMBER FRONT PANEL.

Next: !p1052, !f1053

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT PANEL

Next: p1087, !f1088

PUMP LIMPET TEST

Next: p1083, !f1084

DIVERTER VALVE MOTOR OPERATION

REMOVE, BY UNSCREWING THE RETAINING RING,
THE DIVERTER VALVE MOTOR FROM THE DIVERTER VALVE

Next: !p1079, f1080

PUMP LIMPET TEST

Next: p1073, !f1074

GAS VALVE MODULATION VOLTAGE (NO MODULATION)

{GAINPCBACS}
ON/OFF SWITCH IN THE ON POSITION

Next: !p1067, f1068

INSPECTION DHW CONTROL KNOB

Next: !p1071, !f1072

CH OPERATION

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: !p1075, f1076

INSPECTION BURNER MANIFOLD

REMOVE BURNER MANIFOLD

Next: !p1085, !f1086

FLUE CHECK

Next: !p1089, !f1090

FLUE CHECK

Next: !p119, !f120

PUMP LIMPET TEST

Next: p167, !f168

DIVERTER VALVE OPERATION (CH)

ON/OFF SWITCH IN ON

Next: p159, f160

BY-PASS (INTERNAL)

ENSURE RADIATORS ARE OPEN AND THAT WATER CAN CIRCULATE AROUND THE SYSTEM

Next: !p165, !f166

BY-PASS (INTERNAL) OPENS CORRECTLY

ENSURE THERE IS NO FLOW AROUND THE HEATING SYSTEM
I.E. TURN OFF ALL RADIATORS

Next: !p169, !f170

GAS VALVE TYPE

Next: p274, f275

BOILER VERSION

LOCATION OF THE LOW WATER PRESSURE SWITCH IS JUST ABOVE THE PUMP, RIGHT-HAND SIDE OF THE BOILER

Next: p284, f598

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: p280, !f281

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: p701, !f306

SYSTEM PRESSURE CHECK

Next: p294, !f295

GAS VALVE VOLTAGE

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p296, f609

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: p298, !f593

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: p300, !f301

WATER PRESSURE SWITCH CONTINUITY

REMOVE THE COVER FRO

Next: p302, !f303

WATER PRESSURE SWITCH WIRING HARNESS RESISTANCE

REMOVE THE COVER FROM THE WATER PRESSURE SWITCH BY PULLING BACKWARDS ALONG THE WIRING

Next: !p304, !f305

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT PANEL

Next: p311, !f312

VENTURI BLOCKED

DISCONNECT BOTH AIR

Next: p313, !f314

FAN INSPECTION

Next: p315, !f316

APS TUBES CONDITION

LOCATE THE AIR PRESS

Next: p317, !f318

FLUE CHECK

Next: !p319, !f320

PUMP VOLTAGE

ON/OFF SWITCH IN ON

Next: !p330, f331

FAN VOLTAGE

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p49, !f50

GAS VALVE RESISTANCE - SIT

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: p419, !f420

OBSERVATION BURNER SHUT OFF

RUN HOT WATER TAP UNTIL WATER COOL THEN TURN TAP OFF
DHW TEMPERATURE SELECTOR TO MAX

Next: !p423, ?425, ?427

VOLTAGE GAS VALVE AT DEMAND END

{GAINPCBACS}
RUN

Next: !p429, !f430

VENTURI BLOCKED

DISCONNECT BOTH AIR

Next: p45, !f46

SYSTEM PRESSURE CHECK

Next: p524, !f436

PUMP LIMPET TEST

Next: p437, !f438

FLOW SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p439, f440

RETURN SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: p706, f444

PUMP OVERRUN

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p451, !f448

FLUE CHECK

Next: !p47, !f48

TEMPERATURE DHW OPERATION DIFFERENTIAL

ON/OFF SWITCH IN ON

Next: p455, f460

TEMPERATURE CH OPERATION DIFFERENTIAL AND RUN TO MAX

ON/OFF SWITCH IN ON

Next: !p755, ?765, ?767, ?779

FLAME SENSE ELECTRODE CONDITION AND POSITION

DISCONNECT THE LEAD FROM THE FLAME SENSE ELECTRODE

Next: !p498, !f473

FAN HARNESS RESISTANCE

Next: !p51, !f52

SPARK ELECTRODE GAP

REMOVE THE COMBUSTION CHAMBER FRONT PANEL.

Next: !p495, !f496

OBSERVATION BOILER RESET INTERNAL FAULT

Next: !p503, !f504

PUMP RUNS (CH DEMAND)

ON/OFF SWITCH IN ON POSITION
CH TEMP SELECTOR TO MAX
DHW TEMP SELECTOR TO MIN

Next: p435, f546

APS TUBES CONDITION

LOCATE THE AIR PRESS

Next: p561, !f562

VENTURI BLOCKED

DISCONNECT BOTH AIR

Next: p563, !f564

FLUE CHECK

Next: p567, !f566

APS HARNESS RESISTANCE

GAIN ACCESS TO PCB
USE INSULATION MAT AS REQUIRED

Next: p782, !f569

ELECTRODE/LEAD RESISTANCE

REMOVE BOTH SPARK LEADS FROM THE PCB

Next: p573, !f574

SPARK ELECTRODE GAP

REMOVE THE COMBUSTION CHAMBER FRONT PANEL.

Next: !p575, !f576

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: !p1005, !f1006

GAS VALVE RESISTANCE AND HARNESS

REMOVE CONNECTOR X14 FROM THE PCB

Next: p603, f604

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: !p607, !f608

RESISTANCE PUMP

DISCONNECT CONNECTOR X12 FROM THE PCB

Next: p624, !f625

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR X13 FROM THE PCB

Next: p629, f626

GAS VALVE TYPE

Next: p630, f965

GAS VALVE RESISTANCE AND HARNESS (SIT VALVE) - FUSE INV

REMOVE CONNECTOR X14 FROM THE PCB

Next: !p638, f639

WATER PRESSURE SWITCH CONTINUITY

REMOVE THE COVER FRO

Next: !p642, !f643

BOILER VERSION

LOCATION OF THE LOW WATER PRESSURE SWITCH IS JUST ABOVE THE PUMP, RIGHT-HAND SIDE OF THE BOILER

Next: p640, !f649

FUSE T2 RESISTANCE

REMOVE BLACK FUSE HOLDER T2 FROM THE PCB

Next: p659, f660

FUSE T1.25 RESISTANCE

REMOVE THE BROWN FUSE HOLDER T1.25 FROM THE PCB

Next: p663, f664

TRANSFORMER (VOLTAGE OUT)

{GAINPCBACS}
ON/OFF SWITCH IN ON POSITION
CH DEMAND OFF
DHW DEMAND OFF

Next: p667, f668

VOLTAGE MAIN PCB TO DISPLAY PCB

{GAINPCBACS}
DISCONNECT THE DISPLAY PCB FROM THE FRONT OF THE BOILER FASCIA

Next: !p671, !f672

RETURN SENSOR HARNESS RESISTANCE

DISCONNECT CONNECTOR X2 FROM THE PCB

Next: !p683, f684

INSPECTION DHW CONTROL KNOB

Next: !p689, !f691

FLOW LIMITER

ISOLATE THE DHW SUPPLY AND REMOVE THE DHW INLET

Next: p9, !f10

DIODE GAS VALVE HARNESS

REMOVE THE GAS VALVE

Next: !p702, !f703

PRESSURE BURNER MAXIMUM AND MINIMUM

DHW TEMPERATURE SELE

Next: p443, ?722, ?724

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: !p726, !f770

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: p926, !f772

BY-PASS (INTERNAL)

ENSURE RADIATORS ARE OPEN AND THAT WATER CAN CIRCULATE AROUND THE SYSTEM

Next: !p777, !f778

RESISTANCE APS WITH KIT

REMOVE APS FROM BOILER (LOCATED TOP RIGHT BEHIND COMBUSTION CHAMBER)

Next: !p783, !f784

PCB VOLTS DHW DEMAND

{GAINPCBACS}

Next: !p843, f844

GAS VALVE MODULATION RESISTANCE

DISCONNECT THE MODULATION SOLENOID CONNECTOR FROM THE GAS VALVE

Next: p952, !f901

DHW FILTER

MAINS WATER OFF
<

Next: !p11, !f12

GAS VALVE MODULATION RESISTANCE

DISCONNECT THE MODULATION SOLENOID CONNECTOR FROM THE GAS VALVE

Next: p943, !f927

GAS VALVE HARNESS RESISTANCE

REMOVE THE RED LEADS FROM THE MODULATION GAS VALVE

Next: p947, !f945

GAS VALVE MODULATION VOLTAGE

{GAINPCBACS}
ON/O

Next: !p951, f948

GAS VALVE HARNESS RESISTANCE

REMOVE THE RED LEADS FROM THE MODULATION GAS VALVE

Next: p956, !f954

GAS VALVE MODULATION VOLTAGE

{GAINPCBACS}
ON/O

Next: p957, f958

GAS INLET PRESSURE

ON/OFF SWITCH IN ON

Next: !p964, !f963

INSPECTION PCB JUMPER

{GAINPCBACS}

Next: !p961, !f962

RESISTANCE GAS VALVE AND HARNESS HONEYWELL FUSE INV

{GAINPCBACS}
DISCONNECT CONNECTOR X14 FROM THE PCB

Next: p975, f976

GAS VALVE RESISTANCE - HONEYWELL

DISCONNECT THE MAIN MULTI-PIN CONNECTOR FROM THE GAS VALVE

Next: !p979, !f980

System Information

  • Total Tests: 426
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control