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:

VOKERA LINEA 28

GLOBALLY REPLACED

Next: &2, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

SYSTEM CHECKS

PLEASE ENSURE THE FOLLOWING SYSTEM CHECKS ARE COMPLETED

Next: &1796, !f17

VOKERA LINEA 28 (WITH SIT IGNITION PCB MOUNTED ON GAS VALVE)

{ISOLATEMAINSPOWER}<

Next: &1, !f16

DHW BURNER ESTABLISHED

{ISOLATEMAINSPOWER}
ATTACH U-GAUGE TO BURNER PRESSURE TEST POINT

Next: &1020, ?196, ?198, ?200, ?820

DHW FAN RUNS

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: &1390, f22

DHW FLOW RATE

Next: &86, f19

DHW MODULATION

{ISOLATEMAINSPOWER}<

Next: &12, f244

DHW BURNER IGNITION

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: &3, ?158, ?160

CH DEMAND

{ISOLATEMAINSPOWER}<

Next: &13, ?248, ?346

CH OPERATION

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: &14, ?302, ?308, ?318

SYSTEM PRESSURE RISE

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: &329, f1863

PUMP OVERRUNS

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: &1588, !f334

FACIA DISPLAY

Next: &5, f94

CH MODULATION

{ISOLATEMAINSPOWER}<

Next: &330, f331

RE-IGNITION DELAY

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: &15, !f375

DHW OPERATION

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: &9, ?573, ?575, ?577, ?731, ?735, ?772

DHW BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: &1866, !f1021

SETTING UP BURNER PRESSURE

Next: &nff, !f1023

FUSE FURTHER INVESTIGATION (DUMMY)

OUTSIDE MODEL

Next: &nff, f1839

FAULT 01 PASS = SPARK NO IGNITION | FAIL = NO SPARK | IF IGNITES RETURN TO MAIN TREE BURNER ESTABLISH

OUTSIDE MODEL

Next: &nff, f1279

FAULT 02 - OVERHEAT

OUTSIDE MODEL

Next: &nff, f1307

FAULT 03 - FAN FAULT

OUTSIDE MODEL

Next: &nff, f1309

FAULT 04 - LOW SYSTEM PRESSURE

OUTSIDE MODEL

Next: &nff, f1324

FAULT 06 - DHW SENSOR

OUTSIDE MODEL

Next: &nff, f1314

FAULT 07 - PRIMARY SENSOR

OUTSIDE MODEL

Next: &nff, f1313

OBSERVATION PUMP RUNS

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: &10, f1392

DHW PREHEAT

{ISOLATEMAINSPOWER}<

Next: &nff, !f1589

FAULT CODES

Next: &nff, !f1778

DISABLE PREHEAT FUNCTION

{ISOLATEMAINSPOWER}<

Next: &8, !f1797

FAULT 08 - INCORRECT PCB

OUTSIDE MODEL

Next: &nff, !f1813

FAULT CO - COMBUSTION SETTING

OUTSIDE MODEL

Next: &nff, f1815

OBSERVATION DOES DHW DEMAND END ?

DHW TEMPERATURE CONTROL ON MAX

Next: &572, f1867

UNABLE TO SET PREHEAT

VALVE - GAS

Next: End

NO PATH

REDIRECTS

Next: End

BOILER REACHES TEMPERATURE DHW COLD

VALVE - NON RETURN

Next: End

BURNER LIGHTS FOR A SHORT WHILE

AIR PRESSURE SWITCH

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPERATION

SENSOR - NTC

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER ASHORT WHILE DHW OPERATION

VALVE - NON RETURN

Next: End

MODULATING SOLENOID RESISTANCE PREHEAT

VALVE - GAS

Next: End

DHW BURNER IGNITION BURNER LIGHTS BUT GOES OUT

VENTURI

Next: End

IMMEDIATE RELIGHT PREHEAT ON

FLUE

Next: End

IMMEDIATE RELIGHT PREHEAT ON

PCB - MAIN

Next: End

FACIA DISPLAY

FUSE MAINS

Next: End

FAULT 01

GAS INLET PRESSURE

Next: End

DHW FAN RUNS

TUBE - SILICONE

Next: End

FAULT 01 SPARKING PRESENT

PCB - MAIN

Next: End

FAULT 01 SPARKING PRESENT

SPARK ELECTRODE POSITION

Next: End

FAULT 01 NO SPARKING

SPARK ELECTRODE POSITION

Next: End

FAULT 01

SPARK ELECTRODE & LEAD

Next: End

DHW FAN RUNS

VENTURI

Next: End

FAULT 07

PCB - MAIN

Next: End

FAULT 06

PCB - MAIN

Next: End

FAULT 04

SWITCH - PRESSURE

Next: End

FAULT 04

SWITCH - BOILER FLOW

Next: End

FAULT 04 - NO POWER TO PUMP

PCB - MAIN

Next: End

FAULT 04 - RUNNING SLOW

PUMP

Next: End

FAULT 04

DIAPHRAGM - FLOWSWITCH

Next: End

DHW FAN RUNS - NO POWER TO PUMP

PCB - MAIN

Next: End

DHW FAN RUNS - RUNNING SLOW

PUMP

Next: End

DHW FAN RUNS

DIAPHRAGM - FLOWSWITCH

Next: End

DHW FAN RUNS

SWITCH - BOILER FLOW

Next: End

DHW FAN RUNSFAULT 04

SWITCH - PRESSURE

Next: End

OBSERVATION PUMP RUNS

PCB - MAIN

Next: End

DHW FAN RUNS

DHW FLOW SWITCH

Next: End

DHW PREHEAT

PCB - MAIN - DHW PREHEAT

Next: End

FAULT 03 - SHORTING APS

TUBE - SILICONE

Next: End

FAULT

ELECTRICAL SAFETY CHECKS

Next: End

FAULT 03 - SHORTING APS

VENTURI

Next: End

FAULT 03 - SHORTING APS

FLUE

Next: End

FAULT 03 - NOT SWITCHING

AIR PRESSURE SWITCH

Next: End

FAULT 03 - IGNORING APS SWITCHING

PCB - MAIN

Next: End

FAULT 03 - NOT LETTING APS SWITCH

TUBE - SILICONE

Next: End

FAULT 03 - NOT LETTING APS SWITCH

VENTURI

Next: End

FAULT 03 - NOT LETTING APS SWITCH

FLUE

Next: End

NO SPARKING

SPARK ELECTRODE POSITION

Next: End

DHW BURNER IGNITION

SPARK ELECTRODE & LEAD

Next: End

NO SPARKING

TUBE - SILICONE

Next: End

NO SPARKING

VENTURI

Next: End

NO SPARKING

FLUE

Next: End

FAULT 02 - STUCK OPEN

THERMOSTAT - HIGH LIMIT

Next: End

FAULT 02 - NO POWER TO PUMP

PCB - MAIN

Next: End

FAULT 02 - RUNNING SLOW

PUMP

Next: End

FAULT 02

VALVE - GAS

Next: End

FAULT

SYSTEM CHECKS

Next: End

FAULT 02

SENSOR NTC

Next: End

FAULT 02

SENSOR - NTC

Next: End

FAULT 02

VALVE - NON RETURN

Next: End

FAULT 02

VALVE - BYPASS - AUTO

Next: End

DHW COOL RADS COOL

MAIN PCB AND SPARK ELECTRODE

Next: End

DHW COOL RADS COOL

KNOB - TEMPERATURE CONTROL

Next: End

CH INSUFFICIENT HEAT

KNOB - TEMPERATURE CONTROL

Next: End

DHW NOISY

PUMP

Next: End

DHW OPERATION

VALVE - BYPASS - AUTO

Next: End

DHW UP TO TEMP DHW COLD

PUMP

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPEATION

SENSOR NTC

Next: End

DHW FAN RUNS

FLUE

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPERATION

THERMOSTAT - HIGH LIMIT

Next: End

DHW FIRES BUT SHUTS DOWN

HEAT EXCHANGER - MAIN

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPERATION

PCB - MAIN

Next: End

DHW FIRES THEN CYCLES ON OFF

PUMP

Next: End

FAULT CODES

Z REDIRECT

Next: End

DHW PUMP RUNS

SENSOR NTC

Next: End

DHW PUMP RUNS

SENSOR - NTC

Next: End

FAULT 06

SENSOR - NTC

Next: End

FAULT 07

SENSOR NTC

Next: End

PREHEAT FUNCTION

Z REDIRECT

Next: End

FACIA DISPLAY

FUSE F2

Next: End

FACIA DISPLAY

FUSE F1

Next: End

FACIA DISPLAY

HARNESS - WIRING

Next: End

FACIA DISPLAY

KNOB - MODE SELECTOR CONTROL

Next: End

FAULT 08

PCB - MAIN - FAULT 08

Next: End

FAULT CO

PCB - CONTROL (DISPLAY PCB)

Next: End

SPARKING PRESENT PREHEAT ON

SOLENOID - GAS VALVE

Next: End

NO SPARKING NO POWER TO IGNITION PCB

PCB - MAIN

Next: End

FAULT 01 NO SPARKING

PCB - MAIN

Next: End

FAULT 01

SOLENOID - GAS VALVE

Next: End

FUSE INVESTIGATION

DHW FLOW SWITCH FUSE INV

Next: End

FUSE INVESTIGATION

VALVE - MOTORISED - DIVERTER & BODY

Next: End

FUSE INVESTIGATION

PUMP

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION

VALVE - GAS

Next: End

FUSE INVESTIGATION

VALVE - MOTORISED - DIVERTER

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

STUCK

DHW FLOW SWITCH

Next: End

NO HEATING

KNOB - MODE SELECTOR CONTROL

Next: End

NO HEATING 1

PCB - MAIN

Next: End

DHW BURNER IGNITION

GAS INLET PRESSURE

Next: End

NO CH

PCB - MAIN

Next: End

NO HEATING

PCB - MAIN

Next: End

NO IGNITION ON CH

PCB - MAIN

Next: End

NO SPARKING

AIR PRESSURE SWITCH

Next: End

SPARKING PRESENT

SPARK ELECTRODE POSITION

Next: End

HIGH FLAME NO OUTPUT FROM IGNITION BOARD

PCB - MAIN

Next: End

DHW BURNER ESTABLISHED BURNER IGNITION PRESSURE LOW OR DIES OUT

GAS INLET PRESSURE

Next: End

DHW BURNER ESTABLISHED

HEAT EXCHANGER - MAIN

Next: End

DHW BURNER ESTABLISHED BURNER IGNITES BUT BAFFLES OUT

GAS INLET PRESSURE

Next: End

DHW BURNER ESTABLISH

SPARK ELECTRODE POSITION

Next: End

DHW BURNER ESTABLISH

SPARK ELECTRODE & LEAD

Next: End

DHW BURNER ESTABLISH

SENSOR NTC

Next: End

DHW MODULATION

SENSOR - NTC

Next: End

CH NOISY DHW OK

PUMP

Next: End

CH MODULATION

SENSOR NTC

Next: End

PUMP OVERRUNS

PCB - MAIN

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

SENSOR NTC

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

DIVERTER VALVE BODY

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

PUMP

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

PCB - MAIN

Next: End

CH DEMAND

DHW FLOW SWITCH

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PUMP

Next: End

DHW FAN RUNS

THERMOSTAT - HIGH LIMIT

Next: End

DHW FLOW RATE

COLD WATER INLET STOPCOCK

Next: End

SPARKING PRESENT

PCB - MAIN

Next: End

RE-IGNITION DELAY

PCB - MAIN - RE-IGNITION DELAY

Next: End

DHW TEMPERATURE LOW RADIATORS HOT

PCB - MAIN

Next: End

DHW OPERATION

DHW FLOW SWITCH

Next: End

DHW FLOW RATE

REGULATOR - FLOW

Next: End

CH OPERATION NO PREHEAT

VALVE - BYPASS - AUTO

Next: End

BOILER REACHES TEMPERATURE DHW COLD

THERMOSTAT - HIGH LIMIT

Next: End

BOILER REACHES TEMPERATURE DHW COLD

SENSOR NTC

Next: End

BOILER REACHES TEMPERATURE DHW COLD

SENSOR - NTC

Next: End

DHW TEMP LOW RADS COLDDHW LOW RADS LOW

SENSOR - NTC

Next: End

DHW OPERATION NO PREHEATDHW LOW RADS LOW

VALVE - NON RETURN

Next: End

BOILER REACHES TEMPERATURE DHW COLD

PCB - MAIN

Next: End

BOILER REACHES TEMPERATURE DHW COLD

HEAT EXCHANGER - DOMESTIC

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPERATION

HEAT EXCHANGER - DOMESTIC

Next: End

BOILER LIGHTS CUTS OUT PREHEAT ON

FAN ASSEMBLY

Next: End

IMMEDIATE RELIGHT PREHEAT ON

PCB - ELECTRONIC IGNITION UNIT

Next: End

FACIA DISPLAY

Next: End

FUSE INVESTIGATION MAINS

Z REDIRECT

Next: End

FAULT 01 SPARKING PRESENT

PCB - ELECTRONIC IGNITION UNIT

Next: End

FAULT 01 DHW BURNER IGNITION

BURNER - MAIN (MANIFOLD)

Next: End

FAULT 01 - SPARKING

PCB - ELECTRONIC IGNITION UNIT

Next: End

FAULT 07

Z REDIRECT

Next: End

DHW FAN RUNS

AIR PRESSURE SWITCH

Next: End

FAULT 06

Z REDIRECT

Next: End

FAULT 04

SYSTEM PRESSURE

Next: End

FAULT 04

PRESSURE GAUGE - QUICK PRIMER

Next: End

FAULT 04 - LWPS

PCB - MAIN

Next: End

FAULT 04 - PUMP PROVING MSW

PCB - MAIN

Next: End

FAULT 04 - NOT RUNNING

PUMP

Next: End

FAULT 04

SERVICE KIT PUMP PROVING

Next: End

DHW FAN RUNS - NOT RUNNING

PUMP

Next: End

DHW FAN RUNS

SERVICE KIT PUMP PROVING

Next: End

DHW FAN RUNS - PUMP PROVING MSW

PCB - MAIN

Next: End

DHW FAN RUNS - LWPS

PCB - MAIN

Next: End

OBSERVATION PUMP RUNS

PUMP

Next: End

FAULT 03DHW FAN RUNS

FAN ASSEMBLY

Next: End

FAULT 03 - SHORTED

AIR PRESSURE SWITCH

Next: End

FAULT 03 - NO POWER TO FAN

PCB - MAIN

Next: End

FAULT 03 - RUNNING SLOW

FAN ASSEMBLY

Next: End

DHW BURNER IGNITION - SPARKING

PCB - ELECTRONIC IGNITION UNIT

Next: End

NO SPARKING

FAN ASSEMBLY

Next: End

FAULT 02 - STUCK IN FAULT

PCB - MAIN

Next: End

FAULT 02 - NOT RUNNING

PUMP

Next: End

FAULT 02

HEAT EXCHANGER - DOMESTIC

Next: End

FAULT 02

HEAT EXCHANGER - MAIN

Next: End

FAULT 02

OVERHEAT

Next: End

FAULT 02 - NOT SHUTTING DOWN

PCB - MAIN

Next: End

FAULT 02 - TRIPPING EARLY

THERMOSTAT - HIGH LIMIT

Next: End

DHW TEMP LOW RADIATORS COLD

PCB - MAIN

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PCB - MAIN

Next: End

DHW OPERATION

HEAT EXCHANGER - MAIN

Next: End

BOILER FIRES BUT SHUTS DOWN AFTER A SHORT WHILE DHW OPERATION

PCB - ELECTRONIC IGNITION UNIT

Next: End

FAULT 02

SYSTEM PRESSURE

Next: End

FAULT 02

PRESSURE GAUGE - QUICK PRIMER

Next: End

DHW FAN RUNS PRIMARY THERMISTOR

HARNESS - WIRING - PRIMARY

Next: End

DHW FAN RUNS - DHW THERMISTOR

HARNESS - WIRING (M5)

Next: End

FAULT 06

HARNESS - WIRING (M5)

Next: End

FAULT 07

HARNESS - WIRING - PRIMARY

Next: End

FUSE INVESTIGATION F2

Z REDIRECT

Next: End

FACIA DISPLAY

PCB - MAIN

Next: End

FUSE INVESTIGATION F1

Z REDIRECT

Next: End

FACIA DISPLAY

PCB - CONTROL (DISPLAY PCB)

Next: End

FAULT CO

Z REDIRECT

Next: End

DHW BURNER IGNITION SPARKING PRESENT MECHANICAL

VALVE - GAS

Next: End

FAULT 01

VALVE - GAS

Next: End

FUSE INVESTIGATION

NO FAULT FUSE INVESTIGATION

Next: End

BLOCKED OR RESTRICTED

PIPE ASSEMBLY - EXPANSION VESSEL

Next: End

BOILER STAYING ON

PCB - MAIN

Next: End

DEMAND DOES NOT END

HARNESS - WIRING (M5)

Next: End

NO CH

Next: End

NO CH

INTERNAL CLOCK

Next: End

NO HEATING

Next: End

NO HEATING

INTERNAL CLOCK

Next: End

AIR PRESSURE SWITCH SECTION

HARNESS - WIRING - PRIMARY

Next: End

DHW BURNER ESTABLISHED MECHANICAL FAILURE

VALVE - GAS

Next: End

DHW BURNER ESTABLISH

PCB - ELECTRONIC IGNITION UNIT

Next: End

DHW BURNER IGNITION

BURNER - MAIN (MANIFOLD)

Next: End

DHW MODULATION

PCB - CONTROL (DISPLAY PCB)

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

VALVE - MOTORISED - DIVERTER

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

Next: End

CH MODULATION

PCB - CONTROL (DISPLAY PCB)

Next: End

DHW BURNER ESTABLISHED BURNER IGNITES STRAIGHT TO HIGH FLAME

VALVE - GAS

Next: End

DHW BURNER IGNITION

PCB - ELECTRONIC IGNITION UNIT

Next: End

DHW OPERATION

DIVERTER VALVE BODY

Next: End

DHW OPERATION

VALVE - MOTORISED - DIVERTER

Next: End

DHW OPERATION

HEAT EXCHANGER - DOMESTIC

Next: End

DHW FLOW RATE

HEAT EXCHANGER - DOMESTIC

Next: End

CH NOISY DHW OK

Next: End

DHW TOO HOT

VALVE - NON RETURN

Next: End

DHW FAN RUNS

FAN ASSEMBLY

Next: End

MODUREGDHW LOW RADS LOW WITH PREHEAT

VALVE - GAS

Next: End

DHW TEMPERATURE LOW RADIATORS COLD NO PREHEATDHW LOW RADS LOW

HEAT EXCHANGER - DOMESTIC

Next: End

BAFFLES OUT WITH PREHEAT

FLUE

Next: End

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: !p1328

PRESSURE GAUGE READS OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: !p1330

Sparking present

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p159

No sparking

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p1660

BOILER CONTINUES FIRING PAST 90°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p1724

BOILER RETURNS TO FAULT BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p1727

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: !p1781

PRESSURE GAUGE READS OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: !p1783

Burner ignition pressure low or dies out

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISH

Next: p202

Burner ignites but baffles out

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISH

Next: p211

Burner ignition spark continues, boiler goes to lockout

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISH

Next: p216

No ignition

CHARACTERISTIC TEST FROM CH DEMAND

Next: p1872

Boiler and radiators provide insufficient heat

CHARACTERISTIC TEST FROM CH OPERATION

Next: p303

Boiler to temperature, radiators cold

CHARACTERISTIC TEST FROM CH OPERATION

Next: p309

CH noisy, DHW OK

CHARACTERISTIC TEST FROM CH OPERATION

Next: p319

Burner ignites straight to high flame

CHARACTERISTIC TEST FROM CH DEMAND

Next: p347

DHW noisy operation

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p574

DHW temperature low, radiators cold

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p702

DHW temperature low, radiators hot

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p578

Initial temperature of DHW excessive

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p732

Boiler reaches temperature, DHW cold

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1753

BURNER ESTABLISHES FOR A SHORT WHILE THEN CYCLES ON OFF

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1111

BURNER LIGHTS FOR A SHORT WHILE, GOES OUT, IMMEDIATELY STARTS TO RELIGHT

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISH

Next: p1103

22/04/2021 09:44:58 2104_1_50_1 02/06/2021 10:06:51

30/04/2021 09:26:01

Next: End

VOLTAGE TO MAIN PCB

USE INSULATION MAT AS NECESSARY

Next: p1798, f1254

NON RETURN VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p1097, !f1095

AIR PRESSURE SWITCH N/O

{ISOLATEMAINSPOWER}
DISCONNECT THE RED WIRE (MARKED 1) FROM THE AIR PRESSURE SWITCH

Next: p138, f127

VENTURI

{ISOLATEMAINSPOWER}

Next: p1246, !f1247

RESISTANCE MAINS FUSE

{ISOLATEMAINSPOWER}
REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p1255, f1257

FUSE FURTHER INVESTIGATION

THE INFORMATION PROV

Next: !p1258, !f1259

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p128, !f129

DHW BURNER IGNITION (FAULT CODE)

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1282, f1297

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1285, !f1286

VOLTAGE TO IGNITION PCB

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM
USE INSULATION MAT AS REQUIRED

Next: !p1289, !f1290

VOLTAGE TO IGNITION PCB

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM
USE INSULATION MAT AS REQUIRED

Next: p1298, !f1825

OBSERVATION BOILER RESET OVERHEAT

ENSURE BOILER IS COOL

Next: p1684, f1680

OBSERVATION DOES FAN RUN BEFORE LOCKOUT

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1649, f1593

RESISTANCE PRIMARY THERMISTOR AND HARNESS

{ISOLATEMAINSPOWER}<

Next: p1315, f1791

RESISTANCE DHW THERMISTOR AND HARNESS

{ISOLATEMAINSPOWER}<

Next: p1320, f1790

OBSERVATION SYSTEM PRESSURE

Next: p1325, ?1327, ?1329

OBSERVATION PUMP PROVING MICROSWITCH

MODE SELECTOR SWITCH

Next: p1336, f1354

OBSERVATION PUMP RUNS

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1355, f1356

VOLTAGE PUMP AT PCB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1357, !f1358

OBSERVATION PUMP PROVING MICROSWITCH

MODE SELECTOR SWITCH

Next: p1376, f1377

OBSERVATION PUMP RUNS

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1378, f1379

VOLTAGE PUMP AT PCB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1380, !f1381

VOLTAGE PUMP AT PCB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1393, !f1394

VOLTAGE TO FAN

{ISOLATEMAINSPOWER}<

Next: !p1594, f1595

AIR PRESSURE SWITCH N/O

{ISOLATEMAINSPOWER}
DISCONNECT THE RED WIRE (MARKED 1) FROM THE AIR PRESSURE SWITCH

Next: !p1629, f1597

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1598, !f1599

VOLTAGE TO IGNITION PCB

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM
USE INSULATION MAT AS REQUIRED

Next: p1665, !f1823

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p1681, !f1682

VOLTAGE PUMP AT PCB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1688, !f1689

CH OPERATION

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1716, f1719

BYPASS VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p1720, !f1721

PUMP LIMPET TEST

Next: p1750, !f1749

PUMP LIMPET TEST

Next: p1767, !f1776

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p1785, !f1786

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: !p1788, !f1789

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: !p1792, !f1793

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p1794, !f1795

FUSE FURTHER INVESTIGATION

THE INFORMATION PROV

Next: !p1801, !f1802

FUSE FURTHER INVESTIGATION

THE INFORMATION PROV

Next: !p1805, !f1806

INFORMATION CO FUNCTION

{ISOLATEMAINSPOWER}

Next: !p1816, !f1817

INSPECTION FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM FLOW SWITCH

Next: p1840, !f1841

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: p187, !f188

INSPECTION EXPANSION VESSEL

{ISOLATEMAINSPOWER}
APPLIANCE DRAINED AND DISCHARGED

Next: !p1864, !f1865

RESISTANCE DHW FLOW SWITCH AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR M5 FROM THE PCB

Next: !p1868, f1869

RESISTANCE DHW FLOW SWITCH

{ISOLATEMAINSPOWER}
REMOVE BOTH OF THE LEADS FROM THE WATER FLOW SWITCH

Next: !p1870, !f1871

OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p1877, !f1878

BYPASS INTERNAL CLOCK (NO EXTERNAL CONTROLS)

{ISOLATEMAINSPOWER}<

Next: !p1883, !f1884

BYPASS INTERNAL CLOCK (EXTERNAL CONTROLS FITTED)

{ISOLATEMAINSPOWER}<

Next: !p1887, !f1888

RESISTANCE APS CHECK

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THEIR POSITIONS

Next: !p1890, !f1891

DHW STOPCOCK

{ISOLATEMAINSPOWER}
SET THE DHW STOPCOCK TO FULLY OPEN

Next: p707, !f366

VOLTAGE TO FAN

{ISOLATEMAINSPOWER}<

Next: !p85, f119

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: !p246, !f247

DIVERTER VALVE VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p312, !f341

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: !p332, !f333

VOLTAGE TO IGNITION PCB

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM
USE INSULATION MAT AS REQUIRED

Next: !p368, !f369

DIVERTER VALVE VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p583, !f584

VOLTAGE ON MODUREG

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: !p894, f895

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: p1735, !f897

VOLTAGE TO DISPLAY PCB

{ISOLATEMAINSPOWER}<

Next: p1807, f108

DIFFERENTIAL PRIMARY FLOW AND RETURN

{ISOLATEMAINSPOWER}
ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: !p1096, f1093

MEASUREMENT APS SWITCHING PRESSURE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS.

Next: p1243, !f1109

CH OPERATION

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1112, f1766

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: p1120, !f1121

NON RETURN VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p1122, !f1123

MEASUREMENT FAN PRESSURE

Next: p1244, f1245

VOLTAGE TO IGNITION PCB CONSTANT

{ISOLATEMAINSPOWER}<

Next: !p1250, !f1251

FLUE

Next: !p1248, !f1249

VENTURI

{ISOLATEMAINSPOWER}

Next: p130, !f131

IGNITION PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1283, f1284

ELECTRODE POSITION

{ISOLATEMAINSPOWER}

Next: !p1295, !f1296

GAS VALVE VOLTAGE FROM IGNITION PCB

{ISOLATEMAINSPOWER}<

Next: p1826, f1288

ELECTRODE POSITION

{ISOLATEMAINSPOWER}

Next: p1302, !f1303

FLUE

Next: !p132, !f177

ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}

Next: !p1304, !f1305

OBSERVATION BOILER RESET

Next: !p1317, !f1318

OBSERVATION BOILER RESET

Next: !p1322, !f1323

OBSERVATION BOILER TYPE

INSPECT THE BOTTOM L

Next: p1333, f1332

SYSTEM PRESSURE SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WHITE WIRES FROM THE SYSTEM PRESSURE SWITCH

Next: !p1334, !f1335

RESISTANCE PUMP PROVING MICROSWITCH

{ISOLATEMAINSPOWER}<

Next: !p1337, !f1338

PUMP LIMPET TEST

Next: p1361, !f1359

INSPECTION PUMP PROVING DIAPHRAGM

{ISOLATEMAINSPOWER}
DRAIN BOILER PRIMARY CIRCUIT
GAIN ACCESS TO PUMP PROVING DIAPHRAGM

Next: !p1362, !f1363

OBSERVATION BOILER TYPE

INSPECT THE BOTTOM L

Next: p1374, f1375

SYSTEM PRESSURE SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WHITE WIRES FROM THE SYSTEM PRESSURE SWITCH

Next: !p1388, !f1389

RESISTANCE PUMP PROVING MICROSWITCH

{ISOLATEMAINSPOWER}<

Next: !p1386, !f1387

PUMP LIMPET TEST

Next: p1382, !f1383

DHW FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE PURPLE WIRES FROM THE DHW FLOW SWITCH (ACTUATOR)

Next: p139, !f150

INSPECTION PUMP PROVING DIAPHRAGM

{ISOLATEMAINSPOWER}
DRAIN BOILER PRIMARY CIRCUIT
GAIN ACCESS TO PUMP PROVING DIAPHRAGM

Next: !p1384, !f1385

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: p140, !f358

RESISTANCE PRIMARY THERMISTOR AND HARNESS

{ISOLATEMAINSPOWER}<

Next: p142, f1784

RESISTANCE DHW THERMISTOR AND HARNESS

{ISOLATEMAINSPOWER}<

Next: p1373, f1787

IGNITION PRESSURE

{ISOLATEMAINSPOWER}<

Next: p185, f186

VENTURI

{ISOLATEMAINSPOWER}

Next: p1600, !f1601

FLUE

Next: !p1602, !f1603

MEASUREMENT APS SWITCHING PRESSURE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS.

Next: p1650, !f1651

OBSERVATION SPARKING WITH APS MADE

{ISOLATEMAINSPOWER}<

Next: p1652, !f1653

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1654, !f1655

VENTURI

{ISOLATEMAINSPOWER}

Next: p1656, !f1657

FLUE

Next: !p1658, !f1659

RESISTANCE APS CHECK AT HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR M3 FROM THE PCB

Next: p1661, f1889

OBSERVATION SPARKING WITH APS MADE

{ISOLATEMAINSPOWER}<

Next: p1663, f1664

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1673, !f1674

ELECTRODE POSITION

{ISOLATEMAINSPOWER}

Next: p1669, !f1670

ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}

Next: !p1671, !f1672

VENTURI

{ISOLATEMAINSPOWER}

Next: p1675, !f1676

FLUE

Next: !p1677, !f1678

OBSERVATION PUMP RUNS

{ISOLATEMAINSPOWER}
HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p1683, f1687

PUMP LIMPET TEST

Next: p1694, !f1691

OBSERVATION SYSTEM PRESSURE

Next: p1679, ?1780, ?1782

DHW BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1704, !f1693

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p1698, !f1702

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: p1690, !f1703

DIFFERENTIAL PRIMARY FLOW AND RETURN

{ISOLATEMAINSPOWER}
ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p1709, f1710

OBSERVATION RUN BOILER UP TO TEMPERATURE

{ISOLATEMAINSPOWER}<

Next: !p1722, ?1723, ?1725

NON RETURN VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p1717, !f1718

INFORMATION ANTI SCALD MODE

A KNOWN FAULT WITH T

Next: !p1730, !f1731

INSPECTION DHW CONTROL KNOB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO THE REAR OF THE DISPLAY PCB BY REMOVING THE MAIN PCB

Next: p1729, !f1739

INSPECTION CH CONTROL KNOB

{ISOLATEMAINSPOWER}
GAIN ACCESS TO THE REAR OF THE DISPLAY PCB BY REMOVING THE MAIN PCB

Next: !p1744, !f1746

BYPASS VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p1751, !f1752

PUMP LIMPET TEST

Next: p737, !f1765

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p1768, !f1769

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: p1770, !f1771

DIFFERENTIAL PRIMARY FLOW AND RETURN

{ISOLATEMAINSPOWER}
ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p1772, !f1773

VOLTAGE TO IGNITION PCB CONSTANT

{ISOLATEMAINSPOWER}<

Next: !p1774, !f1775

FUSE F2

{ISOLATEMAINSPOWER}
REMOVE FUSE F2 FROM THE MAIN PCB

Next: p1799, f1800

FUSE F1

{ISOLATEMAINSPOWER}
REMOVE FUSE F1 FROM THE MAIN PCB

Next: !p1803, f1804

RESISTANCE HARNESS DISPLAY BOARD

{ISOLATEMAINSPOWER}
REMOVE THE DISPLAY BOARD HARNESS FROM THE BOILER

Next: p1809, !f1808

INSPECTION SELECTOR SWITCH

{ISOLATEMAINSPOWER}
GAIN ACCESS TO THE REAR OF THE DISPLAY PCB BY REMOVING THE MAIN PCB

Next: !p1810, !f1811

RESISTANCE GAS VALVE SOLENOID

{ISOLATEMAINSPOWER}
DISCONNECT LEAD FROM GAS VALVE

Next: !p1819, !f1820

RESISTANCE GAS VALVE SOLENOID

{ISOLATEMAINSPOWER}
DISCONNECT LEAD FROM GAS VALVE

Next: !p1827, !f1828

INSPECTION DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: p1852, !f1842

RESISTANCE PUMP

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR M15 FROM THE PCB

Next: p1844, !f1845

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR M12 FROM THE PCB

Next: p1846, !f1847

RESISTANCE GAS VALVE

{ISOLATEMAINSPOWER}
DISCONNECT LEAD FROM GAS VALVE

Next: !p1848, !f1849

ELECTRODE POSITION

{ISOLATEMAINSPOWER}

Next: !p242, !f190

RESISTANCE DIVERTER VALVE

{ISOLATEMAINSPOWER}
REMOVE DIVERTER VALVE ACTUATOR AND DISCONNECT ELECTRICAL CONNECTOR

Next: p1843, !f1862

GAS VALVE VOLTAGE FROM IGNITION PCB

{ISOLATEMAINSPOWER}<

Next: p1818, f367

INSPECTION SELECTOR SWITCH

{ISOLATEMAINSPOWER}
GAIN ACCESS TO THE REAR OF THE DISPLAY PCB BY REMOVING THE MAIN PCB

Next: p1873, !f1874

OBSERVATION IS AN INTERNAL CLOCK FITTED

Next: p1875, f1876

OBSERVATION ARE EXTERNAL CONTROLS FITTED

Next: p1881, f1882

BYPASS EXTERNAL CONTROLS (NO INTERNAL CLOCK FITTED)

{ISOLATEMAINSPOWER}<

Next: !p1879, !f1880

BYPASS EXTERNAL CONTROLS (INTERNAL CLOCK FITTED)

{ISOLATEMAINSPOWER}<

Next: !p1885, f1886

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p203, !f245

MODULATING SOLENOID VOLTAGE

HOT WATER TEMPERATURE CONTROL SET TO MAXIMUM

Next: p205, !f206

MODULATING SOLENOID RESISTANCE

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE GREY WIRES FROM THE MODULATING SOLENOID

Next: p207, !f1230

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: !p209, !f210

PRIMARY HEAT EXCHANGER FLUE WAYS

{ISOLATEMAINSPOWER}

Next: p212, !f213

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}<

Next: !p904, !f215

ELECTRODE POSITION

{ISOLATEMAINSPOWER}

Next: p217, !f240

ELECTRODE AND LEAD

{ISOLATEMAINSPOWER}

Next: !p235, !f241

PUMP LIMPET TEST

Next: p304, !f356

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p1743, !f337

DIVERTER VALVE HEAD

{ISOLATEMAINSPOWER}<

Next: p310, f311

DIVERTER VALVE BODY

{ISOLATEMAINSPOWER}
REMOVE DIVERTER VALVE HEAD

Next: p314, !f338

PUMP LIMPET TEST

Next: !p316, !f340

PUMP LIMPET TEST

Next: p713, !f321

DHW FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE PURPLE WIRES FROM THE DHW FLOW SWITCH (ACTUATOR)

Next: !p348, !f352

CH OPERATION

CENTRAL HEATING TEMPERATURE CONTROL SET TO MAXIMUM

Next: !p587, f1747

DIVERTER VALVE HEAD

{ISOLATEMAINSPOWER}<

Next: !p581, f582

DHW FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE PURPLE WIRES FROM THE DHW FLOW SWITCH (ACTUATOR)

Next: p891, !f706

FLOW REGULATOR

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p708, !f709

BYPASS VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p714, !f723

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
DISCONNECT ONE OF THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: p738, !f739

PRIMARY THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE PRIMARY THERMISTOR

Next: p740, !f741

DHW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE PLUG CONNECTOR FROM THE DHW THERMISTOR

Next: p1092, !f743

BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: p892, f893

NON RETURN VALVE

{ISOLATEMAINSPOWER}
CLOSE COLD WATER INLET STOPCOCK
DRAIN AND DISCHARGE APPLIANCE

Next: !p898, !f899

System Information

Total Tests: 435
Sequence Logic: Decoded from encrypted .seq file
Navigation: Dynamic based on pass/fail results
Source: 4731307 GW SWIFTFLOW 100 SIT Control