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 VCW GB 242 EH

GLOBALLY REPLACED

Next: &13, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

CENTRAL HEATING

HEATING SWITCH ON
ROOM STAT CALLING FOR HEAT
RADIATOR VALVES OPEN

Next: &707, f667

DIVERTER VALVE CH MODE

HEATING SWITCH ON
ROOM STAT CALLING FOR HEAT

Next: &1, f219

SERVO VALVE CENTRAL HEATING MODE

HEATING SWITCH ON
SYSTEM CALLING FOR HEAT

Next: &2, f607

HIGH FLAME

HEATING SWITCH OFF
ATTACH PRESSURE GAUGE TO BURNER PRESSURE TEST POINT

Next: &437, ?473, ?475

LOW FLAME TEST

HEATING SWITCH OFF

Next: &5, ?62, ?64, ?66, ?512

FAN RUNNING

HEATING SWITCH OFF

Next: &294, f44

DIVERTER VALVE

HEATING SWITCH OFF

Next: &9, f29

OPERATION SERVO VALVE CAM

HEATING SWITCH OFF

Next: &642, ?23, ?25

MAINS SUPPLY TO BOILER

HEATING SWITCH OFF
(BOTH ON CONTROL PANEL)

Next: &11, f16

VAILLANT VCW GB 242 EH

G.C. NUMBER 47 044 1

Next: &12, !f161

YELLOW NEON CHECK

HEATING SWITCH OFF

Next: &7, f295

HOT WATER

HEATING SWITCH OFF

Next: &3, ?670, ?672

RESISTANCE DHW MICROSWITCH

REMOVE ONE OF THE WIRES FROM THE DHW MICROSWITCH

Next: &10, !f643

OPERATION PUMP AND FAN OVERRUN

Next: &nff, ?708, ?710

FUSE F2 2A

SET - 10 OFF FUSES 2.0AT

Next: End

CH OVERHEAT THERMOSTAT

TEMPERATURE LIMITER

Next: End

DIFFERENTIAL VALVE

DIFFERENTIAL PRESSURE VALVE

Next: End

SPARKING HEARD

PCB - FLAME FAILURE DEVICE - IGNITION

Next: End

DIVERTER VALVE

CONTROL LINE

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

FUSE F1 2A

SET - 10 OFF FUSES 2.0AT

Next: End

EXTERNAL FAULT

Next: End

DHW THERMOSTAT

TEMPERATURE LIMITER

Next: End

NTC RESISTOR

SENSOR - NTC

Next: End

YELLOW NEON CHECK

WIRE - NTC CONNECTION

Next: End

MICROSWITCH M1

MICROSWITCH ASSEMBLY

Next: End

YELLOW NEON

PCB - FLAME FAILURE DEVICE - IGNITION

Next: End

YELLOW NEON TEST

ELECTRODES (SENSING AND SPARK)

Next: End

DIVERTER VALVE CH

CONTROL LINE

Next: End

PUMP

PUMP 230V 5M - GRUNDFOS VP5ZE

Next: End

FAN RUNNING

PCB - FAN CIRCUIT

Next: End

EXTERNAL CONTROLS

Next: End

ELECTRONIC PCB

PCB - ELECTRONIC CONTROL SYSTEM

Next: End

S.C.B.).DOES NOT REACT GIVE POWER TO EXT CONTROLS

PCB

Next: End

DIVERTER VALVE CH BOILER MODULATES MODULATES QUICKLY

CONTROL LINE

Next: End

DHW MODULATES MODULATES QUICKLY

SENSOR - NTC

Next: End

DHW MODULATES MODULATES QUICKLY

TEMPERATURE LIMITER

Next: End

HOT WATER

ELECTRODES (SENSING AND SPARK)

Next: End

STICKING PREVENTING MOVEMENT

SPINDLE AND SUPPORT PLATE

Next: End

STICKING NOT RETURNING

SPINDLE AND SUPPORT PLATE

Next: End

WATER SECTION SPRING DISCONNECTED

SERVO VALVE

Next: End

CH OPERATION

CONTROL LINE

Next: End

CH OPERATION 2

CONTROL LINE

Next: End

DIVERTER VALVE 2

CONTROL LINE

Next: End

LEAKING PREVENTING HIGH FLAME

BANJO CONNECTOR

Next: End

HOSE CONNECTION

TUBES TO DIAPHRAGM PUMP

Next: End

NO POWER TO APS

PCB - FAN CIRCUIT

Next: End

YELLOW NEON

AIR PRESSURE MONITOR

Next: End

YELLOW NEON

HOSE SILICONE RUBBER

Next: End

FLUEWAYS

PRIMARY HEAT EXCHANGER

Next: End

MICROSWITCH M3

MICROSWITCH M3

Next: End

OVERHEAT THERMOSTAT

OVERHEAT CUT - OFF DEVICE

Next: End

FUSE F3 160MA

SET - 10 OFF FUSE 0.16AT

Next: End

PREVENTING DIVERTER MOVEMENT

SYSTEM PRESSURE / AIR

Next: End

PREVENTING DIVERTER MOVEMENT 2

SYSTEM PRESSURE / AIR

Next: End

PREVENTING GAS VALVE OPERATOR MOVING

SYSTEM PRESSURE / AIR

Next: End

MICROSWITCH M2

MICROSWITCH ASSEMBLY

Next: End

CONTROL BOX CLICKS, NO SPARKING HEARD FROM ELECTRODE

ELECTRODES (SENSE & SPARK)

Next: End

CH OPERATION ON HW TREE

CONTROL LINE

Next: End

S.C.B.).DOES NOT REACT GIVE POWER TO EXT CONTROLS POOR DHW

PCB

Next: End

DIVERTER VALVE CH BOILER MODULATES POOR DHW

CONTROL LINE

Next: End

DHW MODULATES POOR DHW

SENSOR - NTC

Next: End

DHW MODULATES POOR DHW

TEMPERATURE LIMITER

Next: End

STUCK ON

Next: End

HIGH FLAME

GAS PRESSURE GOVERNOR

Next: End

RESTRICTED OR BLOCKED

INJECTORS

Next: End

LOW FLAME TEST (1)

PCB - FLAME FAILURE DEVICE - IGNITION

Next: End

FLUE

FLUE

Next: End

BLOCKED / RESTRICTED

ORIFICE / BUSHES

Next: End

MAINS SUPPLY TO BOILER

PCB

Next: End

DIVERTER VALVE

TRANSFORMER

Next: End

LOW FLAME TEST

ELECTRODES (SENSING AND SPARK)

Next: End

NO SPARKING HEARD

ELECTRODES (SENSE & SPARK)

Next: End

SPARKING HEARD

GAS PRESSURE GOVERNOR

Next: End

YELLOW NEON CHECK

TRANSFORMER - IGNITION

Next: End

CH

Next: End

DIVERTER VALVE CENTRAL HEATING MODE

DIVERTER VALVE OR PARTS

Next: End

FAN

FAN

Next: End

CH DEMAND

PCB

Next: End

DHW MODULATES MODULATES QUICKLY

HEAT EXCHANGER - SECONDARY - DHW

Next: End

BOILER MODULATES MODULATES QUICKLY

PRIMARY HEAT EXCHANGER

Next: End

BOILER MODULATES MODULATES QUICKLY

MICROSWITCH ASSEMBLY

Next: End

S.C.B.).DOES NOT REACT TO CH DEMAND

PCB

Next: End

CH BOILER MODULATES MODULATES QUICKLY

Next: End

DIVERTER VALVE CENTRAL HEATING MODE BOILER MODULATES MODULATES QUICKLY

DIVERTER VALVE OR PARTS

Next: End

DHW MODULATES MODULATES QUICKLY

PCB - ELECTRONIC CONTROL SYSTEM

Next: End

HOT WATER

PCB - FLAME FAILURE DEVICE - IGNITION

Next: End

NOT RETURNING

SERVO VALVE

Next: End

CAM NOT MOVING FULLY OVER

WATER VALVE

Next: End

SPINDLE REMAINS UP

WATER VALVE

Next: End

SERVO VALVE BOILER MODULATES MODULATES QUICKLY

SERVO VALVE

Next: End

SERVO VALVE

SERVO VALVE

Next: End

DIVERTER VALVE

DIVERTER VALVE OR PARTS

Next: End

DIAPHRAGM PUMP

DIAPHRAGM PUMP

Next: End

YELLOW NEON

FAN

Next: End

NOT FIRING FOR CH

PCB - ELECTRONIC CONTROL SYSTEM

Next: End

DHW MODULATES

HEAT EXCHANGER - SECONDARY - DHW

Next: End

BOILER MODULATES

PRIMARY HEAT EXCHANGER

Next: End

SERVO VALVE BOILER MODULATES

SERVO VALVE

Next: End

BOILER MODULATES

MICROSWITCH ASSEMBLY

Next: End

CONTROL BOX CLICKS, NO SPARKING HEARD FROM ELECTRODE

GAS PRESSURE GOVERNOR

Next: End

S.C.B.).DOES NOT REACT TO CH DEMAND POOR DHW

PCB

Next: End

CH BOILER MODULATES POOR DHW

Next: End

DIVERTER VALVE CENTRAL HEATING MODE BOILER MODULATES POOR DHW

DIVERTER VALVE OR PARTS

Next: End

FAULTY OVERRUN FUNCTION

PCB

Next: End

ON WITH NO DEMAND

PCB

Next: End

DHW MODULATES POOR DHW

PCB - ELECTRONIC CONTROL SYSTEM

Next: End

BLANK FOR LED INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

DIVERTER VALVE POOR DHW

DIVERTER VALVE OR PARTS

Next: End

DIVERTER VALVE (1)

PCB

Next: End

LOW FLAME TEST (2)

PCB - FLAME FAILURE DEVICE - IGNITION

Next: End

IGNITION TRANSFORMER

TRANSFORMER - IGNITION

Next: End

SERVO VALVE CAM DOES NOT MOVE FULLY OVER

CHARACTERISTIC TEST FROM OPERATION SERVO VALVE CAM

Next: p574

SERVO VALVE CAM DOES NOT FULLY RETURN OR ONLY RETURNS WHEN PRESSED

CHARACTERISTIC TEST FROM OPERATION SERVO VALVE CAM

Next: p589

BOILER DOES NOT GO TO HIGH FLAME

CHARACTERISTIC TEST FROM HIGH FLAME

Next: p477

BOILER GOES TO HIGH FLAME BRIEFLY THEN MODULATES QUICKLY OR CUTS OUT

CHARACTERISTIC TEST FROM HIGH FLAME

Next: p488

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p493

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: !p495

BURNER IGNITES BUT SPARKING CONTINUES / LOCKOUT OCCURS

CHARACTERISTIC TEST FROM LOW FLAME TEST

Next: p514

CONTROL BOX CLICKS, BUT NO SPARKING HEARD AT ELECTRODE

CHARACTERISTIC TEST FROM LOW FLAME TEST

Next: p63

NO SPARKING HEARD

CHARACTERISTIC TEST FROM LOW FLAME TEST

Next: p65

SPARKING HEARD BUT BURNER DOES NOT IGNITE AND THEN LOCKS OUT

CHARACTERISTIC TEST FROM LOW FLAME TEST

Next: p151

INSUFFICIENT TEMPERATURE RISE OR BOILER LOCKS OUT - RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM HOT WATER

Next: p674

INSUFFICIENT TEMPERATURE RISE - RADIATORS BEGIN TO HEAT WITH NO DEMAND

CHARACTERISTIC TEST FROM HOT WATER

Next: !p733

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p679

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: !p681

PUMP OR FAN OVER RUN DO NOT BEHAVE AS DESCRIBED

CHARACTERISTIC TEST FROM OPERATION PUMP AND FAN OVERRUN

Next: !p709

BOILER STAYS ON WITH NO DEMAND

CHARACTERISTIC TEST FROM OPERATION PUMP AND FAN OVERRUN

Next: p711

14/08/2018 08:43:21 1808_1_50_1 16/08/2018 11:11:25

14/08/2018 09:55:01

Next: End

FUSE F1 INTEGRITY CHECK

Next: p18, !f17

VOLTAGE PUMP AT PUMP

HEATING SWITCH OFF
REMOVE PUMP TERMINAL COVER

Next: p657, f222

VOLTAGE EXTERNAL CONTROLS OUT

{GAINPCBACS}
HEATING SWITCH ON

Next: !p471, f318

WATER PUMP VOLTAGE TEST

HEATING SWITCH OFF
REMOVE PUMP TERMINAL COVER

Next: p31, f645

VOLTAGE AIR PRESSURE SWITCH CHECK

APS IS LOCATED AT RE

Next: p296, f629

VOLTAGE EXTERNAL CONTROLS IN

{GAINPCBACS}
HEATING SWITCH ON

Next: !p319, !f472

FAN MAINS VOLTAGE CHECK

HEATING SWITCH OFF

Next: !p46, !f45

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN EXITING THE BOILER AS INDICATED

Next: !p491, ?492, ?494

VOLTAGE PUMP AT PUMP

HEATING SWITCH OFF
REMOVE PUMP TERMINAL COVER

Next: p500, f501

VOLTAGE EXTERNAL CONTROLS OUT

{GAINPCBACS}
HEATING SWITCH ON

Next: !p502, f503

VOLTAGE EXTERNAL CONTROLS IN

{GAINPCBACS}
HEATING SWITCH ON

Next: !p504, !f505

INSPECTION SPINDLE AND SUPPORT PLATE

REMOVE THE SECURING

Next: !p600, !f597

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p602, !f603

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p608, !f609

VOLTAGE AIR PRESSURE SWITCH (IN)

APS IS LOCATED AT RE

Next: p631, !f630

OVERHEAT CUT-OFF DEVICE CHECK

REMOVE COVER FROM THE OVERHEAT CUT-OFF DEVICE
ENSURE APPLIANCE IS COOL

Next: p646, !f647

MICROSWITCHES M1 AND M2 CH OPERATION

REMOVE WIRES FROM DIVERTER MICROSWITCHES AND MAKE SAFE

Next: !p668, !f669

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN EXITING THE BOILER AS INDICATED

Next: !p677, ?678, ?680

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p684, !f685

VOLTAGE PUMP AT PUMP

HEATING SWITCH OFF
REMOVE PUMP TERMINAL COVER

Next: p688, f689

VOLTAGE EXTERNAL CONTROLS OUT

{GAINPCBACS}
HEATING SWITCH ON

Next: !p690, f691

VOLTAGE EXTERNAL CONTROLS IN

{GAINPCBACS}
HEATING SWITCH ON

Next: !p692, !f693

OPERATOR DC VOLTAGE CHECK

{GAINPCBACS}
HEATING SWITCH OFF

Next: p73, !f72

CENTRAL HEATING OVERHEAT THERMOSTAT CHECK

HEATING SWITCH OFF

Next: p155, !f153

OPERATOR DC VOLTAGE CHECK

{GAINPCBACS}
HEATING SWITCH OFF

Next: p662, !f159

DIFFERENTIAL VALVE MOVEMENT CHECK

HEATING SWITCH OFF

Next: !p157, !f158

FUSE F2 INTEGRITY CHECK

Next: p20, !f100

EXTERNAL

{GAINPCBACS}
HEATING SWITCH OFF

Next: p729, !f21

OBSERVATION REMOVE WIRES FROM DHW OVERHEAT STAT

HEATING SWITCH OFF

Next: p306, !f307

NTC RESISTANCE CHECK

DISCONNECT THE NTC SENSOR FROM THE HARNESS

Next: p308, !f309

HARNESS NTC RESISTOR AND DHW OVERHEAT CHECK

Next: p310, !f311

PUMP LIMPET TEST

Next: p650, !f41

MICRO SWITCHES M1 & M2 DOMESTIC HOT WATER OPERATION

REMOVE WIRES FROM DIVERTER VALVE MICROSWITCHES AND MAKE SAFE
HOT WATER TAP OFF

Next: p312, !f313

IGNITION TRANSFORMER VOLTAGE CHECK

HEATING SWITCH OFF

Next: p314, !f315

SPARK AND SENSE ELECTRODE CHECK

Next: !p316, !f317

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p322, !f323

INSPECTION CONTROL LINE CONNECTORS

Next: p610, !f160

GREEN NEON

HEATING SWITCH OFF

Next: p620, !f479

DIFFERENTIAL PLATE HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p489, f490

RESISTANCE NTC-RESISTOR AT SENSOR

DISCONNECT THE NTC SENSOR FROM THE HARNESS

Next: p508, !f509

SERVO VALVE CENTRAL HEATING MODE

HEATING SWITCH ON
SYSTEM CALLING FOR HEAT

Next: p496, f601

DIVERTER VALVE CH MODE

HEATING SWITCH ON
ROOM STAT CALLING FOR HEAT

Next: !p498, f499

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p506, !f507

DISCONNECT OVERHEAT STAT WIRES

HEATING SWITCH OFF

Next: !p510, !f511

SENSE ELECTRODE CHECK

Next: !p515, !f516

INSPECTION SPINDLE AND SUPPORT PLATE

REMOVE THE SECURING

Next: !p599, !f577

INSPECTION SPINDLE GAP

Next: !p588, f595

INSPECTION SERVO VALVE SPRING

Next: p575, !f598

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p619, !f612

INSPECTION BANJO CONNECTOR

Next: p621, !f622

FLAME MODULATION CHECK

ATTACH A PRESSURE GA

Next: p623, !f715

DIAPHRAGM PUMP TUBE (HOSE) CONNECTION

GAIN ACCESS TO THE TUBES RUNNING FROM THE OPERATOR TO THE DIAPHRAGM PUMP IN THE CONTROL BOX

Next: !p627, !f628

SPARK AND SENSE ELECTRODE CHECK

Next: !p69, !f68

AIR (FAN) PRESSURE SWITCH CHECK

REMOVE THE AIR PRESSURE SWITCH FROM THE APPLIANCE

Next: p719, !f633

ORIFICE CHECK

Next: p634, !f728

INSPECTION APS TUBES

Next: p636, !f637

INSPECTION HEAT EXCHANGER FLUEWAYS

Next: !p638, !f639

FUSE F3 INTEGRITY CHECK

Next: p734, !f649

IGNITION TRANSFORMER VOLTAGE CHECK

HEATING SWITCH OFF

Next: p71, f70

INSPECTION SYSTEM PRESSURE AND AIR

Next: p40, !f656

INSPECTION SYSTEM PRESSURE AND AIR

Next: p321, !f661

INSPECTION SYSTEM PRESSURE AND AIR

Next: p156, !f666

DIFFERENTIAL PLATE HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p675, f676

RESISTANCE NTC-RESISTOR AT SENSOR

DISCONNECT THE NTC SENSOR FROM THE HARNESS

Next: p696, !f697

SERVO VALVE CENTRAL HEATING MODE

HEATING SWITCH ON
SYSTEM CALLING FOR HEAT

Next: p682, f683

DIVERTER VALVE CH MODE

HEATING SWITCH ON
ROOM STAT CALLING FOR HEAT

Next: !p686, f687

CONTROL LINE BLOCKAGES

WATER OFF
BOILER DRAINED AND DISCHARGED

Next: !p694, !f695

DISCONNECT OVERHEAT STAT WIRES

HEATING SWITCH OFF

Next: p716, !f699

SPARK AND SENSE ELECTRODE CHECK

Next: !p77, !f76

OBSERVATION DISCONNECT EXTERNAL CONTROLS

REMOVE WIRING FROM TERMINALS 3 AND 4 AND MAKE SAFE

Next: !p712, !f713

INSPECTION INJECTORS

Next: !p717, !f718

INSPECTION FLUE

Next: p632, !f727

FURTHER INVESTIGATION LED FAULTY

Next: !p730, !f731

SENSE ELECTRODE CHECK

Next: !p75, !f74

RESISTANCE TRANSFORMER

{GAINPCBACS}
REMOVE TRANSFORMER CONNECTOR FROM PCB

Next: !p735, !f736

System Information

  • Total Tests: 206
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control