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:

WORCESTER 24 & 28 SI 2 UP TO S/N FD 387 (2 GAS VALVE CONNECTORS AT REAR)

GLOBALLY REPLACED

Next: &6, *

APPLIANCE APPEARS SATISFACTORY.

Next: nff

DHW FAN RUNS

DHW TEMPERATURE CONTROL SET TO MAXIMUM
ENSURE NO DEMAND FOR CH

Next: &11, ?40, ?651, ?653

DHW FLOW RATE

Next: &3, f1211

TYPE OF DIAGNOSTIC PROCEDURE

Next: &4, !f669

WORCESTER 24 & 28 SI 2 UP TO S/N FD 387 (2 GAS VALVE CONNECTORS AT REAR)

{ISOLATEMAINSPOWER}<

Next: &1415, !f15

CH OPERATION

CH TEMPERATURE CONTROL SET TO MAXIMUM

Next: &13, ?254, ?256, ?258

DHW OPERATION

DHW TEMPERATURE CONTROL SET TO MAXIMUM

Next: &1449, ?248, ?250, ?252, ?420, ?1508

BURNER FULL RATE

{ISOLATEMAINSPOWER}<

Next: &1446, f23

DHW BURNER IGNITES

DHW TEMPERATURE CONTROL SET TO MAXIMUM

Next: &9, ?129, ?131, ?1365, ?1367

OVERRUNS

Next: &nff, f27

SYSTEM PRESSURE RISE

Next: &12, !f26

CH DEMAND

CH TEMPERATURE CONTR

Next: &7, ?999, ?1001

FAULT CODE SLOW FLASH

OUTSIDE MODEL

Next: &nff, f1047

FAULT CODE FAST FLASH

OUTSIDE MODEL

Next: &nff, f1155

FURTHER INVESTIGATION MELTED APS

OUTSIDE MODEL

Next: &nff, f1318

OBSERVATION BOILER STANDBY

ENSURE NO DEMANDS

Next: &5, ?1416, ?1418, ?1420

PRESSURE BURNER MINIMUM RATE

{ISOLATEMAINSPOWER}<

Next: &8, !f1447

OBSERVATION DHW MODULATION

{ISOLATEMAINSPOWER}<

Next: &998, f1451

PUMP DOES NOT RUN

CONTROL BOARD

Next: End

PUMP DOES NOT RUN

HARNESS PUMP

Next: End

CH DEMAND EXTERNAL CONTROLS FITTED

Next: End

CH DEMAND PROGRAMMER FITTED

CONTROL BOARD

Next: End

CH OPERATION BOILER TO TEMPERATURE RADIATORS COOL

PUMP

Next: End

CH OPERATION CH NOISY OPERATION

PUMP

Next: End

CH OPERATION CH NOISY OPERATION

PIPE - BYPASS

Next: End

CH OPERATION CH NOISY OPERATION

NTC / THERMISTOR CH

Next: End

CH OPERATION CH NOISY OPERATION

CONTROL BOARD

Next: End

SLOW FLASH CUTTING OUT ON RAMP UP

GAS INLET PRESSURE

Next: End

SLOW FLASH POOR CONDITION OR GAP

SET - ELECTRODES - FLAME AND IGNITION

Next: End

SLOW FLASH OPEN CCT

SET - ELECTRODES - FLAME AND IGNITION

Next: End

SLOW FLASH DOES NOT ESTABLISH

BURNER

Next: End

SLOW FLASH NOT ESTABLISHING

MANIFOLD BURNER

Next: End

SLOW FLASH NOT ESTABLISHING

GAS INLET PRESSURE

Next: End

SLOW FLASH NOT IGNITING

SET - ELECTRODES - FLAME AND IGNITION

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

SLOW FLASH NO POWER TO EXT CONTROLS

CONTROL BOARD

Next: End

SLOW FLASH NO POWER TO PUMP

CONTROL BOARD

Next: End

SLOW FLASH RUNNING SLOW

PUMP

Next: End

SLOW FLASH BOTH PRESSURES OUT

GAS INLET PRESSURE

Next: End

SLOW FLASH MINIMUM OUT

GAS INLET PRESSURE

Next: End

SLOW FLASH NOT MODULATING DHW

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

SLOW FLASH NOT MODULATING

NTC / THERMISTOR CH

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

PIPE - BYPASS

Next: End

FAST FLASH FIRES WITH NO DEMAND

CONTROL BOARD SERVICE POTENTIOMETER

Next: End

FAST FLASH

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAST FLASH

NTC / THERMISTOR CH

Next: End

FAST FLASH POSITIONING

HARNESS - MAIN

Next: End

FAST FLASH OPEN CCT

SWITCH - AIR - PRESSURE

Next: End

FAST FLASH NOT RECOGNISING APS SWITCHING

CONTROL BOARD

Next: End

FAST FLASH OPEN CCT

PROBE - AIR PRESSURE SENSING

Next: End

FAST FLASH OPEN CCT

FLUE

Next: End

DHW FLOW RATE

VALVE - DCW IN

Next: End

DHW FLOW RATE

FLOW REGULATOR C/W FILTER

Next: End

DHW FLOW RATE

FLOW REGULATOR

Next: End

DHW FLOW RATE

WATER SUPPLY

Next: End

FAST FLASH RESISTANCE

HARNESS FAN

Next: End

FAST FLASH SHORT CCT

PROBE - AIR PRESSURE SENSING

Next: End

FAST FLASH SHORT CCT

SWITCH - AIR - PRESSURE

Next: End

FAST FLASH

CODE PLUG

Next: End

SLOW FLASH PUMP DOES NOT RUN

HARNESS PUMP

Next: End

SLOW FLASH NOT RESETTING

THERMOSTAT OVERHEAT

Next: End

SLOW FLASH NO SPARKING

SET - ELECTRODES - FLAME AND IGNITION

Next: End

SLOW FLASH NO SPARKING

WIRE - IGNITION

Next: End

SLOW FLASH

CODE PLUG

Next: End

SLOW FLASH NOT IGNITING

GAS INLET PRESSURE

Next: End

SLOW FLASH NO POWER TO GAS VALVE

CONTROL BOARD

Next: End

SLOW FLASH MAXIMUM OUT

GAS INLET PRESSURE

Next: End

SLOW FLASH NO POWER TO MODUREG

CONTROL BOARD

Next: End

SLOW FLASH GAS VALVE MODUREG

HARNESS - MAIN

Next: End

FURTHER INF MELTED APS

HARNESS FAN + APS

Next: End

MELTED APS STIFF

FAN + AIR PRESSURE SWITCH

Next: End

MELTED FAN MOTOR FAULTY

FAN + AIR PRESSURE SWITCH

Next: End

DHW FLOW SWITCH DHW FAN RUNS

HARNESS - MAIN

Next: End

DHW FLOW SWITCH GREEN WIRE

HARNESS - MAIN

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

PROBE - AIR PRESSURE SENSING

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

FLUE

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

NTC / THERMISTOR CH

Next: End

FAN DOES NOT RUN

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

CODE PLUG

Next: End

DHW BURNER IGNITES

HEAT EXCHANGER FLUE WAYS

Next: End

BURNER ESTABLISHES

SET - ELECTRODES - FLAME AND IGNITION

Next: End

BURNER ESTABLISHES

HARNESS - END FLAME SENSE

Next: End

BURNER ESTABLISHES

NTC / THERMISTOR CH

Next: End

BURNER ESTABLISH

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

BURNER ESTABLISHES

GAS INLET PRESSURE

Next: End

BURNER ESTABLISHES

HEAT EXCHANGER FLUE WAYS

Next: End

BURNER ESTABLISHES

FLUE

Next: End

BURNER ESTABLISHESIGNITES BUT BAFFLES

GAS INLET PRESSURE

Next: End

BURNER ESTABLISHESIGNITES BUT BAFFLES

HEAT EXCHANGER FLUE WAYS

Next: End

BURNER ESTABLISHESIGNITES BUT BAFFLES

FLUE

Next: End

BURNER IGNITES BUT BAFFLES

BURNER

Next: End

SLOW FLASH FAN DOES NOT RUN

PROBE - AIR PRESSURE SENSING

Next: End

SLOW FLASHDHW FAN RUNS (FAN DOES NOT RUN)

FLUE

Next: End

FAN RUNS FOR 35 SECONDS SHORT TIME

HEAT EXCHANGER FLUE WAYS

Next: End

OBSERVATION BOILER STANDBY - FAULT CODE 2

Z REDIRECTION

Next: End

OBSERVATION BOILER STANDBY - FIRES WITH NO DEMAND

CONTROL BOARD SERVICE POTENTIOMETER

Next: End

OBSERVATION BOILER STANDBY

Next: End

OBSERVATION BOILER STANDBY

FROST PROTECTION

Next: End

OBSERVATION BOILER STANDBY

TAP OPEN OR LEAK

Next: End

PRESSURE BURNER MINIMUM RATE

GAS VALVE ADJUSTMENT

Next: End

OBSERVATION DHW MODULATION

NTC / THERMISTOR CH

Next: End

OBSERVATION DHW MODULATION

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW OPERATION DHW RUNS HOT THEN COLD

THERMOSTAT OVERHEAT

Next: End

DHW OPERATION DHW RUNS HOT THEN COLD

NTC / THERMISTOR CH

Next: End

DHW OPERATION DHW RUNS HOT THEN COLD

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW BURNER IGNITES (SPARKING)

CONTROL BOARD

Next: End

BURNER FULL RATE

HARNESS - MAIN

Next: End

BURNER FULL RATE

NTC / THERMISTOR CH

Next: End

BURNER FULL RATE

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

GAS VALVE NO IGNITION

HARNESS - MAIN

Next: End

OBSERVATION BOILER STANDBY - FIRES NO DEMAND

NTC / THERMISTOR CH

Next: End

OBSERVATION BOILER STANDBY

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

OBSERVATION BOILER STANDBY - FAN RUNS CONTINUALLY

CONTROL BOARD SERVICE POTENTIOMETER

Next: End

OBSERVATION BOILER STANDBY - FAN RUNS CONTINUALLY

NTC / THERMISTOR CH

Next: End

DHW COOL RADS WARM

Next: End

DHW COOL RADS HEAT

NTC / THERMISTOR CH

Next: End

DHW COOL RADS HEAT

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAN RUNS FOR 2 SECONDS

HARNESS FAN

Next: End

SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

OVERRUNS

NTC / THERMISTOR CH

Next: End

BURNER FULL RATE

GAS INLET PRESSURE

Next: End

DHW OPERATION

NTC / THERMISTOR CH

Next: End

DHW OPERATION

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW OPERATION

MANIFOLD BURNER

Next: End

DHW OPERATION DHW TOO HOT

NTC / THERMISTOR CH

Next: End

DHW OPERATION DHW TOO HOT

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

CH OPERATION BOILER COOL RADIATORS COOL

NTC / THERMISTOR CH

Next: End

DHW FAN RUNS (FAN RUNS FOR VERY SHORT TIME)

CONTROL BOARD

Next: End

OPERATIONAL SEQUENCE

SYSTEM CHECKS

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

FUSE F1

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

FUSE F2

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

TRANSFORMER

Next: End

FAN2

HARNESS FAN

Next: End

DHW FAN RUNS (FAN RUNS)

SWITCH - AIR - PRESSURE

Next: End

DHW FAN RUNS (FAN RUNS)

PROBE - AIR PRESSURE SENSING

Next: End

DHW FAN RUNS (FAN RUNS)

FLUE

Next: End

DHW BURNER IGNITES (NO SPARKING)

SET - ELECTRODES - FLAME AND IGNITION

Next: End

DHW BURNER IGNITES (NO SPARKING)

WIRE - IGNITION

Next: End

DHW FAN RUNS (NO SPARKING)

PROBE - AIR PRESSURE SENSING

Next: End

DHW FAN RUNS (NO SPARKING)

FLUE

Next: End

DHW FAN RUNS (NO SPARKING)

SWITCH - AIR - PRESSURE

Next: End

DHW FAN RUNS (FAN RUNS)

KIT THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW FAN RUNS (FAN RUNS)

THERMOSTAT OVERHEAT

Next: End

FAN RUNS SHORT TIME

NTC / THERMISTOR CH

Next: End

DHW BURNER IGNITES SPARKING PRESENT

THERMOSTAT OVERHEAT

Next: End

DHW BURNER IGNITES (SPARKING)

GAS INLET PRESSURE

Next: End

DHW BURNER IGNITES (SPARKING)

SET - ELECTRODES - FLAME AND IGNITION

Next: End

PUMP DOES NOT RUN

PUMP

Next: End

CH DEMAND

Next: End

CH DEMAND PROGRAMMER FITTED

INTEGRAL PROGRAMMER

Next: End

CH OPERATION BOILER TO TEMPERATURE RADIATORS COOL

Next: End

CH OPERATION CH NOISY OPERATION

HEAT EXCHANGER

Next: End

SLOW FLASH INCORRECT PRESSURE

GAS VALVE

Next: End

SLOW FLASH NOT RECOGNISING FLAME

CONTROL BOARD

Next: End

SLOW FLASH CUTTING OUT

GAS VALVE

Next: End

SLOW FLASH NOT IGNITING

MANIFOLD BURNER

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

Next: End

SLOW FLASH BOTH PRESSURES OUT

GAS VALVE

Next: End

SLOW FLASH WRONG VOLTAGE TO MODUREG

CONTROL BOARD

Next: End

SLOW FLASH MINIMUM OUT

GAS VALVE

Next: End

SLOW FLASH NOT MODULATING ON DHW

CONTROL BOARD

Next: End

SLOW FLASH NOT MODULATING ON CH

CONTROL BOARD

Next: End

SLOW FLASH OVERHEAT INVESTIGATION

HEAT EXCHANGER

Next: End

SLOW FLASH NO FAULT

NORMAL OPERATION

Next: End

SLOW FLASH STUCK ON

CONTROL BOARD

Next: End

SLOW FLASH CUTTING OUT EARLY

THERMOSTAT OVERHEAT

Next: End

FAST FLASH FIRING WITH NO DEMAND

CONTROL BOARD

Next: End

FAST FLASH DHW THERMISTOR

HARNESS - MAIN

Next: End

FAST FLASH CH THERMISTOR

HARNESS - MAIN

Next: End

FAST FLASH STUCK IN FAULT

CONTROL BOARD

Next: End

FAST FLASH APS OPEN CCT

Z REDIRECTION

Next: End

FAST FLASH RUNNING SLOW

FAN ASSEMBLY

Next: End

DHW FLOW RATE

HEAT EXCHANGER (DHW FLOW RATE)

Next: End

FAST FLASH NEUTRAL FAULT FAN

CONTROL BOARD

Next: End

FAST FLASH INCORRECT RESISTANCE

FAN ASSEMBLY

Next: End

FAST FLASH NO POWER TO FAN

CONTROL BOARD

Next: End

FAST FLASH APS SHORT CCT

HARNESS - MAIN

Next: End

FAST FLASH APS SHORTED

Z REDIRECTION

Next: End

SLOW FLASH STUCK IN FAULT

CONTROL BOARD

Next: End

SLOW FLASH PUMP DOES NOT RUN

PUMP

Next: End

SLOW FLASH SAFETY CIRCUIT

HARNESS - MAIN

Next: End

SLOW FLASH NO SPARKING

CONTROL BOARD

Next: End

SLOW FLASH NOT OPENING

GAS VALVE

Next: End

SLOW FLASH OPEN CIRCUIT TO GAS VALVE

HARNESS - MAIN

Next: End

SLOW FLASH MAXIMUM OUT

GAS VALVE

Next: End

MELTED APS

CONTROL BOARD + AIR PRESSURE SWITCH

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

SENSOR FLOW

Next: End

DHW FAN RUNS FLOW SWITCH VOLTAGE IN

CONTROL BOARD

Next: End

APS DHW FAN RUNS

HARNESS - MAIN

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

SWITCH - AIR - PRESSURE

Next: End

PRIMARY SENSOR DHW FAN RUNS

HARNESS - MAIN

Next: End

DHW SENSOR FAN DOES NOT RUN

HARNESS - MAIN

Next: End

DHW FAN RUNS

CONTROL BOARD

Next: End

BURNER ESTABLISHES

CONTROL BOARD

Next: End

IGNITES BUT BAFFLES

GAS VALVE

Next: End

SLOW FLASH FAN DOES NOT RUN

HARNESS - MAIN

Next: End

SLOW FLASH FAN DOES NOT RUN

SWITCH - AIR - PRESSURE

Next: End

SLOW FLASH FAN DOES NOT RUN

CONTROL BOARD

Next: End

OBSERVATION BOILER STANDBY - FAULT CODE 1

Z REDIRECTION

Next: End

OBSERVATION DHW MODULATION

GAS VALVE

Next: End

OBSERVATION DHW MODULATION

CONTROL BOARD

Next: End

DHW OPERATION DHW RUNS HOT THEN COLD

CONTROL BOARD

Next: End

DHW BURNER IGNITES (SPARKING) - NOT OPENING

GAS VALVE

Next: End

BURNER FULL RATE

GAS VALVE

Next: End

BURNER FULL RATE

GAS VALVE ADJUSTMENT

Next: End

BURNER FULL RATE

CONTROL BOARD

Next: End

DHW BURNER IGNITES (SPARKING) - RESISTANCE

GAS VALVE

Next: End

OBSERVATION BOILER STANDBY PRIMARY SENSOR FIRES NO DEMAND

HARNESS - MAIN

Next: End

OBSERVATION BOILER STANDBY DHW SENSOR

HARNESS - MAIN

Next: End

OBSERVATION BOILER STANDBY

CONTROL BOARD

Next: End

OBSERVATION BOILER RESET - FAN RUNS CONTINUALLY

CONTROL BOARD

Next: End

OBSERVATION BOILER STANDBY PRIMARY SENSOR FAN RUNS CONTINUALLY

HARNESS - MAIN

Next: End

DHW COOL RADS HEAT PRIMARY SENSOR

HARNESS - MAIN

Next: End

DHW COOL RADS HEAT

CONTROL BOARD

Next: End

DHW COOL RADS HEAT DHW SENSOR

HARNESS - MAIN

Next: End

DHW FAN RUNS (FAN RUNS FOR VERY SHORT TIME)

FAN ASSEMBLY

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

TUBING 5M LONG SILICONE

Next: End

FAULTY

TEE PIECE

Next: End

FAN RUNS CH (FAN RUNS)

TUBING 5M LONG SILICONE

Next: End

FAULTY 2

TEE PIECE

Next: End

NO SPARKING

TUBING 5M LONG SILICONE

Next: End

FAULTY 3

TEE PIECE

Next: End

FAST FLASH OPEN CCT

TUBING 5M LONG SILICONE

Next: End

FAULTY 4

TEE PIECE

Next: End

FAST FLASH SHORT CCT

TUBING 5M LONG SILICONE

Next: End

FAULTY 5

TEE PIECE

Next: End

SLOW FLASH FAN DOES NOT RUN

TUBING 5M LONG SILICONE

Next: End

FAULTY 6

TEE PIECE

Next: End

DHW OPERATION DHW NOISY OPERATION

HEAT EXCHANGER

Next: End

OVERRUNS

CONTROL BOARD

Next: End

DHW OPERATION DHW TOO COLD

HEAT EXCHANGER

Next: End

DHW OPERATION DHW TOO HOT

CONTROL BOARD

Next: End

CH OPERATION BOILER COOL RADIATORS COOL

CONTROL BOARD

Next: End

NO NEUTRAL

CONTROL BOARD

Next: End

DHW FAN RUNS 2

CONTROL BOARD

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

CONTROL BOARD

Next: End

DHW FAN RUNS (FAN DOES NOT RUN)

FAN ASSEMBLY

Next: End

DHW FAN RUNS (FAN RUNS)

FAN ASSEMBLY

Next: End

DHW BURNER IGNITES (NO SPARKING)

CONTROL BOARD

Next: End

DHW FAN RUNS (NO SPARKING)

FAN ASSEMBLY

Next: End

DHW FAN RUNS (FAN RUNS)

CONTROL BOARD

Next: End

FAN RUNS SHORT TIME OVERHEAT

HARNESS - MAIN

Next: End

DHW BURNER IGNITES (SPARKING)

MANIFOLD BURNER

Next: End

OVERHEAT SPARKING

HARNESS - MAIN

Next: End

PUMP DOES NOT RUN BUT BURNER IGNITES

CHARACTERISTIC TEST FROM CH DEMAND

Next: p1002

APPLIANCE RESETS, FAN RUNS BUT EITHER DOES NOT IGNITE OR FLAME DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET SLOW FLASH

Next: p1059

BOILER WILL NOT RESET OR RESETS AND IMMEDIATELY RETURNS TO FAULT CODE

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET SLOW FLASH

Next: p1278

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

CHARACTERISTIC TEST FROM DHW BURNER IGNITES (FAULT CODE)

Next: p1071

BURNER FULLY CROSSLIGHTS, SPARK DOESN T STOP, BOILER LOCKS OUT

CHARACTERISTIC TEST FROM DHW BURNER IGNITES (FAULT CODE)

Next: p1073

MINIMUM BURNER PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1117

MAXIMUM BURNER PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1309

BOTH MAXIMUM AND MINIMUM INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER MAX AND MIN

Next: p1121

BOILER TEMP ABOVE 85 DEGREES, BOILER STILL FIRING

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p1151

BOILER GOES TO LOCKOUT UNDER 85 DEGREES

CHARACTERISTIC TEST FROM INSPECTION LOCKOUT TEMPERATURE

Next: !p1153

BOILER DOES NOT FIRE BUT REMAINS IN FAULT CODE

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET FAST FLASH

Next: p1265

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET FAST FLASH

Next: p1160

MAINS VOLTAGE ABSENT BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE TO FAN HIGH SPEED

Next: p1254

MAINS VOLTAGE PRESENT BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE TO FAN HIGH SPEED

Next: !p1231

Sparking present BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM DHW BURNER IGNITES

Next: p929

No sparking

CHARACTERISTIC TEST FROM DHW BURNER IGNITES

Next: p776

BURNER IGNITES BUT SPARKING CONTINUES UNTIL LOCKOUT

CHARACTERISTIC TEST FROM DHW BURNER IGNITES

Next: p1369

BURNER IGNITES AND ESTABLISHES BUT BAFFLES

CHARACTERISTIC TEST FROM DHW BURNER IGNITES

Next: p1384

FAN DOES NOT RUN, FAULT CODE REOCCURS IN APPROX 30 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET SLOW FLASH

Next: p1395

FAN RUNS CONTINUALLY AS SOON AS POWER IS TURNED ON

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1499

PUMP RUNS OR BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1434

FAULT INDICATOR LIGHT FLASHING

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1421

DHW TOO COLD, RADIATORS BEGIN TO HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1509

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1526

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1528

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1531

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1533

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1535

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1537

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1540

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1542

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1545

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1547

TUBES UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1550

TEE UNSATISFACTORY

CHARACTERISTIC TEST FROM AIR PRESSURE SWITCH TUBES

Next: !p1552

DHW noisy operation

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p249

DHW TOO COLD, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p251

DHW too hot

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p253

CH noisy operation

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1016

Boiler to temperature, radiators cool

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1013

Boiler and radiators cool

CHARACTERISTIC TEST FROM CH OPERATION

Next: p259

Fan does not run

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p703

DHW runs hot then cold

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1458

Fan runs for approximately 2 seconds then stops

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p652

Fan runs for approximately 35 seconds then stops

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p740

MAINS VOLTAGE ABSENT BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE TO FAN HIGH SPEED

Next: p706

MAINS VOLTAGE PRESENT BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE TO FAN HIGH SPEED

Next: !p708

PUMP DOES NOT RUN AND BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM CH DEMAND

Next: p1000

29/08/2018 13:21:52 1808_1_50_1 20/09/2018 11:02:00

30/08/2018 11:33:56

Next: End

EXTERNAL CONTROLS VOLTAGE INPUT

Next: !p1009, !f1010

RESISTANCE OVERHEAT THERMOSTAT AT PCB

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR ST16 FROM THE PCB

Next: p1048, f1288

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: !p1076, !f1077

EXTERNAL CONTROLS VOLTAGE OUTPUT

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED.

Next: p1106, f1107

EXTERNAL CONTROLS VOLTAGE INPUT

Next: !p1108, !f1109

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: !p1134, !f1135

DHW THERMISTOR SENSOR (MODULATION)

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1138, !f1139

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1142, !f1143

INTEGRAL BYPASS

{ISOLATEMAINSPOWER}
DRAIN AND DISCHARGE APPLIANCE

Next: !p1146, !f1147

OBSERVATION BOILER RESET FAST FLASH

ENSURE NO DEMANDS
CH TEMPERATURE SELECTOR SET TO MIN

Next: p1156, ?1157, ?1159

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1165, !f1166

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1169, !f1170

VOLTAGE TO FAN (HIGH SPEED)

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED.

Next: p1251, ?1228, ?1230

INFORMATION FURTHER INVESTIGATION APS

Next: !p1193, !f1194

OBSERVATION COLD MAINS SUPPLY

TURN COLD WATER TAP ON

Next: p1219, !f1226

AIR PRESSURE SWITCH N/O

{ISOLATEMAINSPOWER}
REMOVE THE BLUE WIRE FROM THE AIR PRESSURE SWITCH

Next: !p1257, f1258

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1259, ?1544, ?1546

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p1289, !f1290

IGNITION ELECTRODE

{ISOLATEMAINSPOWER}

Next: p1292, !f1293

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1300, !f1301

VOLTAGE GAS VALVE AT PCB

{ISOLATEMAINSPOWER}<

Next: !p1304, !f1305

RESISTANCE FAN

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM FAN ASSEMBLY (NOTE CONNECTIONS FOR REINSTATEMENT)

Next: p1319, !f1324

VOLTAGE DHW FLOW SWITCH IN

Next: !p1328, f1329

RESISTANCE HARNESS DHW FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT INLINE CONNECT FROM FLOW SENSOR
DISCONNECT ST16 PLUG FROM PCB

Next: !p1330, !f1331

AIR PRESSURE SWITCH N/O

{ISOLATEMAINSPOWER}
REMOVE THE BLUE WIRE FROM THE AIR PRESSURE SWITCH

Next: !p1337, f1338

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1339, ?1525, ?1527

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1348, !f1349

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1352, !f1353

AIR PRESSURE SWITCH N/O

{ISOLATEMAINSPOWER}
REMOVE THE BLUE WIRE FROM THE AIR PRESSURE SWITCH

Next: !p1397, f1398

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1399, ?1549, ?1551

VOLTAGE MODULATING SOLENOID AT PCB (MODULATION)

{ISOLATEMAINSPOWER}<

Next: !p1452, f1453

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p1454, !f1455

RESISTANCE HARNESS GAS VALVE (MAIN SOLENOID)

{ISOLATEMAINSPOWER}<

Next: !p1485, !f1484

RESISTANCE HARNESS GAS VALVE (MODULATION SOLENOID)

{ISOLATEMAINSPOWER}<

Next: !p1476, !f1477

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p1480, !f1481

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1489, !f1490

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1493, !f1494

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1505, !f1506

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p1515, !f1516

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1519, !f1520

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1473, !f383

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p28, !f29

EXTERNAL CONTROLS VOLTAGE INPUT

Next: p711, f712

MAINS POWER SUPPLY

{ISOLATEMAINSPOWER}

Next: p713, !f714

IGNITION ELECTRODE

{ISOLATEMAINSPOWER}

Next: p795, !f796

RESISTANCE PRIMARY SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p921, !f928

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p926, !f927

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p978, !f945

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1465, !f971

EXTERNAL CONTROLS VOLTAGE OUTPUT

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED.

Next: p1007, f1008

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p1003, !f1004

RESISTANCE PUMP HARNESS

{ISOLATEMAINSPOWER}

Next: !p1005, !f1006

INTEGRAL PROGRAMMER

{ISOLATEMAINSPOWER}<

Next: !p1011, !f1012

PUMP LIMPET TEST

Next: !p1014, !f1015

PUMP LIMPET TEST

Next: p1017, !f1018

INTEGRAL BYPASS

{ISOLATEMAINSPOWER}
DRAIN AND DISCHARGE APPLIANCE

Next: p1019, !f1020

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p1021, !f1022

CH MODULATION

{ISOLATEMAINSPOWER}<

Next: !p1023, !f1024

OBSERVATION BOILER RESET SLOW FLASH

Next: p1056, ?1058, ?1060, ?1394

INSPECTION SYSTEM PRESSURE

{ISOLATEMAINSPOWER}

Next: p1102, !f1103

DHW SPARKING

{ISOLATEMAINSPOWER}
REMOVE INNER CASING COVER
CH POTENTIOMETER SET TO MINIMUM

Next: p1062, f1291

DHW BURNER IGNITES (FAULT CODE)

CH POTENTIOMETER SET TO MINIMUM

Next: p1068, ?1070, ?1072

BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1090, f1299

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: !p1088, !f1089

BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: p1074, f1075

FLAME SENSE ELECTRODE

{ISOLATEMAINSPOWER}

Next: p1078, !f1079

FLAME SENSE ELECTRODE LEAD

{ISOLATEMAINSPOWER}<

Next: p1080, !f1081

INSPECTION BURNER

{ISOLATEMAINSPOWER}
REMOVE BURNER ASSEMBLY

Next: p1084, !f1085

INSPECTION INJECTORS

{ISOLATEMAINSPOWER}
REMOVE BURNER ASSEMBLY

Next: !p1086, !f1087

IGNITION ELECTRODE

{ISOLATEMAINSPOWER}

Next: !p1100, !f1101

CH DEMAND PUMP RUNS

CH TEMPERATURE CONTR

Next: p1104, f1105

PUMP LIMPET TEST

Next: p1112, !f1113

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p1282, !f1111

PRESSURE BURNER MAX AND MIN

{ISOLATEMAINSPOWER}<

Next: p1114, ?1116, ?1118, ?1120

DHW MODULATION

{ISOLATEMAINSPOWER}
ATTACH A U-GAUGE TO THE GAS VALVE BURNER PRESSURE TEST POINT

Next: p1136, f1137

PRESSURE MIN SOLENOID DISCONNECTED

{ISOLATEMAINSPOWER}<

Next: !p1132, f1133

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: !p1122, !f1123

CH MODULATION

{ISOLATEMAINSPOWER}<

Next: p1140, f1141

DIFFERENTIAL HEAT EXCHANGER

{ISOLATEMAINSPOWER}<

Next: p1144, f1145

INSPECTION LOCKOUT TEMPERATURE

{ISOLATEMAINSPOWER}<

Next: !p1148, ?1150, ?1152

DHW FAN RUNS (FAULT CODE)

CH POTENTIOMETER SET TO MINIMUM

Next: p1173, f1174

RESISTANCE DHW SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1163, f1164

INSPECTION SERVICE MODE POTENTIOMETER

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB

Next: !p1161, !f1162

RESISTANCE PRIMARY SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1167, f1168

INSPECTION ST16 PLUG

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1171, !f1172

PRESSURE APS SWITCHING

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

Next: p1191, f1192

OBSERVATION SPARKING APS PROVEN

{ISOLATEMAINSPOWER}<

Next: p1195, !f1196

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p1199, ?1539, ?1541

VENTURI

{ISOLATEMAINSPOWER}

Next: p1201, !f1202

FLUE

Next: !p1203, !f1204

DHW STOP COCK

SET THE DHW STOP COCK TO FULLY OPEN

Next: p1220, !f1221

DHW INLET FILTER

{ISOLATEMAINSPOWER}<

Next: p1222, !f1223

DHW FLOW REGULATOR

{ISOLATEMAINSPOWER}
TURN OFF DHW STOP COCK
ENSURE APPLIANCE IS DRAINED AND DISCHARGED

Next: !p1227, !f1225

CONTINUITY FAN HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST1 FROM THE PCB.

Next: !p1252, !f1253

RESISTANCE APS AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1255, f1256

VENTURI

{ISOLATEMAINSPOWER}

Next: p1261, !f1262

INFORMATION FURTHER INVESTIGATION APS

Next: !p1263, !f1264

CODE PLUG

{ISOLATEMAINSPOWER}

Next: p1158, !f1277

CODE PLUG

{ISOLATEMAINSPOWER}

Next: !p1279, !f1298

RESISTANCE PUMP HARNESS

{ISOLATEMAINSPOWER}

Next: !p1283, !f1284

IGNITION ELECTRODE LEADS

{ISOLATEMAINSPOWER}
REMOVE THE IGNITION ELECTRODE LEADS

Next: !p1294, !f1295

GAS VALVE VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p1302, f1303

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1313, !f1311

VOLTAGE MODUREG (FULL) AT PCB

{ISOLATEMAINSPOWER}<

Next: p1315, !f1314

VOLTAGE MODUREG (FULL) AT GAS VALVE

{ISOLATEMAINSPOWER}<

Next: !p1316, !f1317

CONTINUITY FAN HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST1 FROM THE PCB.

Next: p1320, !f1321

INSPECTION FAN ASSEMBLY FREE

{ISOLATEMAINSPOWER}

Next: !p1322, !f1323

VOLTAGE DHW FLOW SWITCH OUT

{ISOLATEMAINSPOWER}
GAIN ACCESS TO DHW FLOW SWITCH MOLEX CONNECTOR

Next: p1326, f1327

RESISTANCE HARNESS DHW FLOW SWITCH GREEN WIRE

{ISOLATEMAINSPOWER}
DISCONNECT INLINE CONNECT FROM FLOW SENSOR
DISCONNECT ST16 PLUG FROM PCB

Next: p1335, !f1333

RESISTANCE APS AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1345, f1336

VENTURI

{ISOLATEMAINSPOWER}

Next: p1341, !f1342

FLUE

Next: !p1343, !f1344

RESISTANCE PRIMARY SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1346, f1347

RESISTANCE DHW SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1350, f1351

CODE PLUG

{ISOLATEMAINSPOWER}

Next: !p1355, !f1354

HEAT EXCHANGER (FLUE WAYS)

{ISOLATEMAINSPOWER}

Next: p793, !f1364

FLAME SENSE ELECTRODE

{ISOLATEMAINSPOWER}

Next: p1370, !f1371

FLAME SENSE ELECTRODE LEAD

{ISOLATEMAINSPOWER}<

Next: p1372, !f1373

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p1374, !f1375

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: p1376, !f1377

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1378, !f1379

HEAT EXCHANGER (FLUE WAYS)

{ISOLATEMAINSPOWER}

Next: p1380, !f1381

FLUE

Next: !p1382, !f1383

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO GAS VALVE INLET PRESSURE TEST POINT

Next: p1385, !f1386

HEAT EXCHANGER (FLUE WAYS)

{ISOLATEMAINSPOWER}

Next: p1387, !f1388

FLUE

Next: p1391, !f1390

INSPECTION BURNER

{ISOLATEMAINSPOWER}
REMOVE BURNER ASSEMBLY

Next: !p1392, !f1393

RESISTANCE APS AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1405, f1396

VENTURI

{ISOLATEMAINSPOWER}

Next: p1401, !f1402

FLUE

Next: !p1403, !f1404

HEAT EXCHANGER (FLUE WAYS)

{ISOLATEMAINSPOWER}

Next: p743, !f1414

OBSERVATION DISCONNECT FLOW SWITCH

{ISOLATEMAINSPOWER}
DISCONNECT THE DHW FLOW SWITCH INLINE CONNECTOR AND MAKE SAFE

Next: p1426, !f1445

FAULT CODES

Next: !p1422, !f1423

INSPECTION SERVICE MODE POTENTIOMETER

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB

Next: p1429, !f1428

EXTERNAL CONTROLS VOLTAGE OUTPUT (NO DEMAND)

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED
ENSURE NO DEMANDS

Next: p1486, !f1431

TEMPERATURE AMBIENT

{ISOLATEMAINSPOWER}

Next: p1419, !f1444

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1456, !f1457

OVERHEAT THERMOSTAT

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: p1459, !f1460

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p1461, !f1462

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1463, !f1464

RESISTANCE GAS VALVE (MAIN SOLENOID) AND HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1466, f1467

VOLTAGE GAS VALVE AT PCB

{ISOLATEMAINSPOWER}<

Next: !p1470, !f1471

RESISTANCE GAS VALVE (MODULATION SOLENOID) AND HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1474, f1475

VOLTAGE MODULATING SOLENOID AT PCB

{ISOLATEMAINSPOWER}<

Next: !p1478, f1479

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p1482, !f1483

RESISTANCE PRIMARY SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1487, f1488

RESISTANCE DHW SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1498, f1492

INSPECTION SERVICE MODE POTENTIOMETER

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB

Next: p1500, !f1501

RESISTANCE PRIMARY SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1502, f1504

EXTERNAL CONTROLS VOLTAGE OUTPUT (NO DEMAND)

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED
ENSURE NO DEMANDS

Next: p1512, !f1510

RESISTANCE PRIMARY SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: p1513, f1514

RESISTANCE DHW SENSOR AT PCB

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST16 FROM THE PCB

Next: !p1517, f1518

CONTINUITY FAN HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST1 FROM THE PCB.

Next: !p1522, !f1523

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p410, !f411

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: p416, !f417

RESISTANCE PRIMARY SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE ONE OF THE WIRES FROM THE PRIMARY SENSOR

Next: !p444, !f445

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: p412, !f413

BURNER MANIFOLD

{ISOLATEMAINSPOWER}

Next: !p414, !f415

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: !p431, !f419

VOLTAGE TO FAN (LOW SPEED)

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED

Next: p1521, !f668

VOLTAGE TO FAN (HIGH SPEED)

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED.

Next: p704, ?705, ?707

CONTINUITY FAN HARNESS

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR ST1 FROM THE PCB.

Next: !p735, !f736

VOLTAGE AT FUSE F2 OUTPUT

Next: p1325, f710

FUSE F2

{ISOLATEMAINSPOWER}
REMOVE FUSE F2 FROM THE PCB

Next: p717, !f718

FUSE F1

{ISOLATEMAINSPOWER}
REMOVE FUSE F1 FROM THE PCB

Next: !p715, !f716

TRANSFORMER RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE THE TRANSFORMER FROM THE CONTROL BOX

Next: !p719, !f720

PRESSURE APS SWITCHING

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

Next: p741, !f742

OBSERVATION SPARKING APS PROVEN

{ISOLATEMAINSPOWER}<

Next: p1406, f913

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p749, ?1530, ?1532

VENTURI

{ISOLATEMAINSPOWER}

Next: p751, !f752

FLUE

Next: !p753, !f754

PRESSURE APS SWITCHING

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

Next: p792, !f806

OBSERVATION SPARKING APS PROVEN

{ISOLATEMAINSPOWER}<

Next: p1356, f794

AIR PRESSURE SWITCH TUBES

{ISOLATEMAINSPOWER}

Next: p799, ?1534, ?1536

IGNITION ELECTRODE LEADS

{ISOLATEMAINSPOWER}
REMOVE THE IGNITION ELECTRODE LEADS

Next: !p797, !f798

VENTURI

{ISOLATEMAINSPOWER}

Next: p801, !f802

FLUE

Next: !p803, !f804

RESISTANCE DHW SENSOR AT SENSOR

{ISOLATEMAINSPOWER}
REMOVE THE WIRES FROM THE DHW SENSOR

Next: p922, !f923

RESISTANCE OVERHEAT THERMOSTAT AT PCB

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR ST16 FROM THE PCB

Next: !p924, f925

RESISTANCE OVERHEAT THERMOSTAT AT PCB

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR ST16 FROM THE PCB

Next: p967, f943

BURNER PRESSURE

{ISOLATEMAINSPOWER}<

Next: p968, f969

IGNITION ELECTRODE

{ISOLATEMAINSPOWER}

Next: !p976, !f977

System Information

  • Total Tests: 478
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control