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:

4104485 VAILLANT ECOTEC PLUS 637 H HEP

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

4104485 VAILLANT ECOTEC PLUS 637 H HEP

Next: &3, !f219

OBSERVATION DISPLAY OPERATION

ON/OFF SWITCH ON (SWITCH FLUSH WITH THE FASCIA ON THE APPLIANCE)

Next: &655, ?1440, ?1442

OBSERVATION FAN RUNS CH DEMAND

BOILER CH THERMOSTAT SET TO MAX
ENSURE CH SYSTEM IS COOL

Next: &177, ?1483, ?1485

OBSERVATION BURNER IGNITION AND ESTABLISH

Next: &1867, ?183, ?185, ?187

OPERATION CH

CH THERMOSTAT SET TO MAX

Next: &1517, ?1472, ?1474, ?1896

OBSERVATION PUMP OVERRUN

Next: &nff, !f500

OBSERVATION SELF CHECK

NO DEMANDS

Next: &607, ?659, ?661, ?1436, ?2075

HEADER FOR F75 FAULT CODE

Next: &nff, f574

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &137, !f608

USER DISPLAY GUIDE

THE USER DISPLAY ON

Next: &556, !f656

HEADER FOR F22

INTENTIONALLY BLANK

Next: &nff, f697

HEADER FOR F00,F01,F10,F11,F64,F71,F85

INTENTIONALLY BLANK HEADER

Next: &nff, f708

F23, F24, F72, F83, F84

INTENTIONALLY BLANK HEADER

Next: &nff, f1801

HEADER FOR F42, F70, F92

INTENTIONALLY BLANK HEADER

Next: &nff, f792

HEADER FOR F52, F53

INTENTIONALLY BLANK HEADER

Next: &nff, f802

HEADER FOR F26

INTENTIONALLY BLANK HEADER

Next: &nff, f820

HEADER FOR F27, F62

INTENTIONALLY BLANK HEADER

Next: &nff, f1857

HEADER FOR F32

INTENTIONALLY BLANK HEADER

Next: &nff, f1380

HEADER FOR F20

INTENTIONALLY BLANK HEADER

Next: &nff, f924

HEADER FOR F49

INTENTIONALLY BLANK HEADER

Next: &nff, f938

HEADER FOR F93

INTENTIONALLY BLANK HEADER

Next: &nff, f942

HEADER FOR F61

INTENTIONALLY BLANK HEADER

Next: &nff, f973

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK HEADER

Next: &nff, f2134

HEADER FOR COMMUNICATION FAULT

INTENTIONALLY BLANK HEADER

Next: &nff, f1022

USER DISPLAY GUIDE

THE USER DISPLAY ON

Next: &nff, !f1031

SETTING DEVICE SPECIFIC NUMBERS GUIDE

Next: &nff, !f1162

OPERATION DHW

CH DEMAND OFF
DHW DEMAND ON

Next: &499, ?1518, ?1520

CALLING UP THE INSTALLER LEVEL AND DIAGNOSTIC CODE GUIDANCE

Next: &nff, !f1841

INITIATING CHECK PROGRAMME P.01 - MAXIMUM LOAD

Next: &nff, !f1865

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: &277, !f2074

HEADER FOR F73, F74

INTENTIONALLY BLANK

Next: &nff, f1937

HEADER FOR F76

INTENTIONALLY BLANK

Next: &nff, f1983

COMMUNICATION FAULT

PCB MAIN

Next: End

NO COMMUNICATION

CABLE - DISPLAY

Next: End

BLANK FOR FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR USER DISPLAY GUIDE FOR PREHEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

BAFFLING OUT (BLOCKED)

PIPE - INLET - AIR

Next: End

RESISTANCE OUT OF RANGE

CODING RESISTOR GAS GROUP

Next: End

BURNER BAFFLING

GAS INLET PRESSURE

Next: End

BLANK FOR DSN SETTING

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO VOLTAGE TO AIR MASS SENSOR

PCB MAIN

Next: End

TO AIR MASS SENSOR

HARNESS WIRING X20 AND X25

Next: End

BAFFLING

BURNER

Next: End

BAFFLING

HEAT EXCHANGER PRIMARY

Next: End

BAFFLING

FLUE ASSEMBLY

Next: End

NOT RECTIFYING

CABLE - IGNITION

Next: End

NOT RECTIFYING

ELECTRODE

Next: End

CAUSING NO RECTIFICATION

BURNER

Next: End

IGNITES BUT DOES NOT ESTABLISH

PIPE - INLET - AIR

Next: End

HIGH FAN PRESSURE

PIPE - INLET - AIR

Next: End

RESTRICTED HIGH FAN PRESSURE

VENTURI

Next: End

TO STEPPER MOTOR

HARNESS WIRING X20 AND X25

Next: End

TO SOLENOIDS

HARNESS WIRING X20 AND X25

Next: End

NO VOLTAGE TO BOTTOM SOLENOID

PCB MAIN

Next: End

TO BOTTOM SOLENOID

HARNESS WIRING X20 AND X25

Next: End

STOPPING BURNER LIGHTING

CODING RESISTOR GAS GROUP

Next: End

RESTRICTED FAN PRESSURE

SIPHON/TRAP

Next: End

RESTRICTED FAN PRESSURE

BURNER

Next: End

RESTRICTED FAN PRESSURE

HEAT EXCHANGER PRIMARY

Next: End

SPARKING NOT LIGHTING

ELECTRODE

Next: End

SPARKING NOT LIGHTING

BURNER

Next: End

FROST PROTECTION

SENSOR - NTC CH FLOW/CH RETURN

Next: End

BOILER FIRES WITH NO DEMAND 1

PCB MAIN

Next: End

BOILER FIRES WITH NO DEMAND

PCB MAIN

Next: End

FROST PROTECTION

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

SPANNER IN DISPLAY

PCB MAIN

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (MAINS)

Next: End

VENTURI AIR MASS SENSOR

VENTURI

Next: End

HARNESS X2

HARNESS WIRING X2

Next: End

FUSE F1

FUSE F1

Next: End

DISPLAY ILLUMINATES BUT NO TEXT ON SCREEN

PCB MAIN

Next: End

DISPLAY ILLUMINATES BUT NO TEXT ON SCREEN

CABLE - DISPLAY

Next: End

NO DEMAND TO FAN 2

SENSOR - NTC CH FLOW/CH RETURN

Next: End

CH DOES NOT RESPOND

PCB MAIN

Next: End

CH DOES NOT RESPOND 1

PCB MAIN

Next: End

CH DOES NOT RESPOND 2

PCB MAIN

Next: End

BOILER REACHES TEMP RADS COOL

Next: End

BOILER REACHES TEMP RADS COOL

PARAMETER DSN

Next: End

BOILER REACHES TEMP RADS COOL

PARAMETER HEATING POWER

Next: End

BOILER REACHES TEMP RADS COOL

SENSOR - NTC CH FLOW/CH RETURN

Next: End

BOILER REACHES TEMP RADS COOL

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

NO DEMAND FOR FAN 2

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

DC HALL SENSOR

HARNESS WIRING X20 AND X25

Next: End

SPARKING

CABLE - IGNITION

Next: End

SPARKING

ELECTRODE

Next: End

F75

CABLE - PUMP

Next: End

F23 F24 F83 F84

SENSOR FITMENT

Next: End

F23 F24 F83 F84

SENSOR - NTC CH FLOW/CH RETURN

Next: End

F23 F24 F83 F84

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

F23 24 72 83 84

SYSTEM PRESSURE

Next: End

F23 24 72 83 84

PCB MAIN

Next: End

F23 24 72 83 84

CABLE - PUMP

Next: End

F23 24 72 83 84

Next: End

SYSTEM RESTRICTION EXCESSIVE DIFFERENTIAL

Next: End

INCORRECTLY SET

PARAMETER DSN

Next: End

F23 F24 F72 F83 F84

PCB MAIN

Next: End

FAULTY PUMP OVERRUN

PCB MAIN

Next: End

RESTRICTED OR BLOCKED

PIPE - INLET - AIR

Next: End

RESTRICTED

SIPHON/TRAP

Next: End

RESTRICTED

FLUE ASSEMBLY

Next: End

RESTRICTED

BURNER

Next: End

RESTRICTED

HEAT EXCHANGER PRIMARY

Next: End

WEAK

PUMP

Next: End

BLANK FOR DIAGNOSTIC CODES GUIDE

Z DIRECTION CHOICE OR CONTINUE

Next: End

F27 F62

ELECTRODE

Next: End

USING CHECK PROGRAMMES

Z DIRECTION CHOICE OR CONTINUE

Next: End

F42 F70 F92

PARAMETER DSN

Next: End

FLAT

EXPANSION VESSEL 10L

Next: End

F22 F73 F74

SYSTEM PRESSURE

Next: End

NO POWER TO LOW PRESSURE SWITCH 2

PCB MAIN

Next: End

F73 F74

SYSTEM PRESSURE

Next: End

FAULT CODE F73 F74

PCB MAIN

Next: End

F73 F74

HARNESS WIRING X2

Next: End

PASSING

GAS VALVE

Next: End

BURNER NOT IGNITING

GAS INLET PRESSURE

Next: End

NOT ESTABLISHING

GAS INLET PRESSURE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

SIPHON/TRAP

Next: End

BOILER REACHES TEMP RADS COOL

SYSTEM PRESSURE

Next: End

BOILER REACHES TEMP RADS REMAIN COOL

SERVICE COCK

Next: End

SPANNER IN DISPLAY

BURNER OFF LINK

Next: End

BOILER REACHES TEMP RADS COOL

PUMP

Next: End

BOILER REACHES TEMP RADS REMAIN COOL

FILTER

Next: End

RADS FAIL TO REACH SET TEMP

PIPE - INLET - AIR

Next: End

POOR OUTPUT

SIPHON/TRAP

Next: End

POOR OUTPUT

FLUE ASSEMBLY

Next: End

POOR OUTPUT

BURNER

Next: End

POOR OUTPUT

HEAT EXCHANGER PRIMARY

Next: End

MODULATES BEFORE GAS RATE CAN BE TAKEN

PUMP

Next: End

MODULATES BEFORE GAS RATE CAN BE TAKEN

FILTER

Next: End

F93

GAS INLET PRESSURE

Next: End

NO VOLTAGE TO AIR MASS SENSORFAILS PT F93

PCB MAIN

Next: End

TO AIR MASS SENSORFAILS PT F93

HARNESS WIRING X20 AND X25

Next: End

F93

PIPE - INLET - AIR

Next: End

F93

SIPHON/TRAP

Next: End

F93

FLUE ASSEMBLY

Next: End

F93

COMBUSTION SEALS

Next: End

F93

BURNER

Next: End

F93

HEAT EXCHANGER PRIMARY

Next: End

LOW PRESSURE

GAS INLET PRESSURE

Next: End

FAN RUNS CONTINIUOUSLY

HARNESS WIRING X20 AND X25

Next: End

FAN RUNS CONTINUOUSLY 1

PCB MAIN

Next: End

RUNS CONTINUOUSLY

FAN

Next: End

FAN DOES NOT RUN

CABLE 230V - FAN

Next: End

NO DEMAND TO FAN

SENSOR - NTC CH FLOW/CH RETURN

Next: End

NO DEMAND FOR FAN

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

FAULT CODE F32

CABLE 230V - FAN

Next: End

F32 FAULT CODE

HARNESS WIRING X20 AND X25

Next: End

NOT GIVING DEMAND TO FAN F32

PCB MAIN

Next: End

F32 NO DEMAND TO RUN FAN

PCB MAIN

Next: End

HALL SENSOR SIGNAL F32

FAN

Next: End

TO CODING RESISTOR

HARNESS WIRING X20 AND X25

Next: End

F76

HARNESS WIRING X20 AND X25

Next: End

FUSE INVESTIGATION

CABLE - PUMP

Next: End

INVESTIGATION FUSE

CABLE - PUMP

Next: End

FUSE INVESTIGATION

CABLE 230V - FAN

Next: End

PUMP PULSING

SYSTEM PRESSURE

Next: End

F75 - NO VOLTAGE TO LWPS

PCB MAIN

Next: End

F75

HARNESS WIRING X2

Next: End

F75 RUNNING SLOW

PUMP

Next: End

FILTER PRIMARY CIRCUIT

FILTER

Next: End

F75

EXPANSION VESSEL 10L

Next: End

PUMP PULSING INTERMITTENT

SYSTEM PRESSURE

Next: End

F75 - NO VOLTAGE TO LWPS INTERMITTENT

PCB MAIN

Next: End

F75 INTERMITTENT

HARNESS WIRING X2

Next: End

F75 RUNNING SLOW INTERMITTENT

PUMP

Next: End

FILTER PRIMARY CIRCUIT INTERMITTENT

FILTER

Next: End

BLANK FOR CASE OFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

F75 INTERMITTENT

EXPANSION VESSEL 10L

Next: End

BAFFLING

SIPHON/TRAP

Next: End

FAULTY PUMP OVERRUN 1

PCB MAIN

Next: End

NO POWER TO PUMP

PCB MAIN

Next: End

BLANK FOR TYPE OF PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FOR USER DISPLAY GUIDE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

F00 F01 F10 F11 F64 F71 F85

SENSOR FITMENT

Next: End

FAULT CODES

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

FAULT CODES

SENSOR - NTC CH FLOW/CH RETURN

Next: End

NO VOLTAGE TO AIR MASS SENSOR F52, F53

PCB MAIN

Next: End

TO AIR MASS SENSOR F52, F53

HARNESS WIRING X20 AND X25

Next: End

DISCONNECTED

VENTURI AIR MASS SENSOR CONNECTION

Next: End

TO STEPPER MOTOR F26

HARNESS WIRING X20 AND X25

Next: End

F20

CABLE - IGNITION

Next: End

F20

ELECTRODE

Next: End

F20

SENSOR - NTC CH FLOW/CH RETURN

Next: End

F20

SENSOR - NTC - CH FLOW/ CH RETURN

Next: End

F49

PCB MAIN

Next: End

F61

HARNESS WIRING X20 AND X25

Next: End

F61 (3)

HARNESS WIRING X20 AND X25

Next: End

F61 (2)

HARNESS WIRING X20 AND X25

Next: End

NO COMMUNICATION

DISPLAY - PLUS

Next: End

BLANK FOR FAULT CODES 2 (2)

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT RESPONDING TO VARYING AIRFLOW

VENTURI

Next: End

NO VOLTAGE AT REST

VENTURI

Next: End

BAFFLING

GAS VALVE

Next: End

F42 F70 F90

PCB MAIN

Next: End

NOT RECOGNISING RECTIFICATION

PCB MAIN

Next: End

NO VOLTAGE TO STEPPER MOTOR

PCB MAIN

Next: End

STEPPER MOTOR

GAS VALVE

Next: End

NOT SWITCHING TOP SOLENOID

PCB MAIN

Next: End

TOP SOLENOID GONE

GAS VALVE

Next: End

BOTTOM SOLENOID NOT OPENING

GAS VALVE

Next: End

NOT OPENING ELECTRICALLY SOUND

GAS VALVE

Next: End

RESTRICTED FAN PRESSURE

FLUE ASSEMBLY

Next: End

SPARKING NOT LIGHTING WRONG MIX

GAS VALVE

Next: End

BOILER FIRES WITH NO DEMAND

EBUS CONTROLS

Next: End

BOILER FIRES WITH NO DEMAND

Next: End

OPERATION CORRECTLY

FROST PROTECTION

Next: End

SPANNER IN DISPLAY

MAINTENANCE INTERVAL

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION MAINS

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK DISPLAY AT STARTUP

HARNESS WIRING X20 AND X25

Next: End

LOW WATER PRESSURE SWITCH

SENSOR - WATER PRESSURE

Next: End

DISPLAY PCB

DISPLAY - PLUS

Next: End

HARNESS DISPLAY PCB

CABLE - DISPLAY

Next: End

PCB MAIN

PCB MAIN

Next: End

FURTHER INVESTIGATION FUSE F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

DISPLAY ILLUMINATES BUT NO TEXT ON SCREEN

DISPLAY - PLUS

Next: End

CH DOES NOT RESPOND

Next: End

CH DOES NOT RESPOND 1

Next: End

CH DOES NOT RESPOND

EBUS CONTROLS

Next: End

POOR HOT WATER

Next: End

DOES NOT RECOGNISE DHW DEMAND

Next: End

NO DEMAND TO FAN FROM PCB 2

PCB MAIN

Next: End

HALL SENSOR SIGNAL

FAN

Next: End

NOT SPARKING

PCB MAIN

Next: End

F23 23 72 83 84

PUMP

Next: End

OVERHEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

LOW PRESSURE

FAN

Next: End

BLOCKED

TUBE - EXPANSION VESSEL

Next: End

BLOCKED F22

SENSOR - WATER PRESSURE

Next: End

F73 - F74

SENSOR - WATER PRESSURE

Next: End

F73 F74

ADAPTOR

Next: End

FAULT CODE F73 F74

SENSOR - WATER PRESSURE

Next: End

F73 F74

SENSOR - WATER PRESSURE

Next: End

F27 F62

PCB MAIN

Next: End

FAULT CODE F22

ADAPTOR

Next: End

FAULT CODE F22

SENSOR - WATER PRESSURE

Next: End

F76

PCB MAIN

Next: End

BOILER REACHES TEMP RADS COOL

Next: End

F73 F74

PCB MAIN

Next: End

PCB NOT RECOGNISING SYSTEM PRESSURE

PCB MAIN

Next: End

BOILER REACHES TEMP RADS COOL

PCB MAIN

Next: End

POOR OUTPUT

FAN

Next: End

MODULATES BEFORE GAS RATE CAN BE TAKEN

PCB MAIN

Next: End

MODULATES BEFORE GAS RATE CAN BE TAKEN

HEAT EXCHANGER PRIMARY

Next: End

F93 INLET AND PERFORMANCE TEST OK

PCB MAIN

Next: End

PERFORMANCE ANALYSIS FAIL F93

VENTURI

Next: End

NO VOLTAGE AT RESTFAILS PT F93

VENTURI

Next: End

F93

COMBUSTION ADJUSTMENT

Next: End

F93

GAS VALVE

Next: End

FAN RUNS CONTINUOUSLY

PCB MAIN

Next: End

NO POWER TO FAN

PCB MAIN

Next: End

NOT RUNNING WITH CORRECT VOLTAGES

FAN

Next: End

NO DEMAND TO FAN FROM PCB

PCB MAIN

Next: End

FAULT CODE F32

FAN

Next: End

FAULT CODE F32

PCB MAIN

Next: End

NOT RUNNING WITH CORRECT VOLTAGES F32

FAN

Next: End

FAN RUNS CONTINUOUSLY

FAN

Next: End

F32 NO PICKING UP FAN RUNNING

PCB MAIN

Next: End

FUSE INVESTIGATION

PCB - FUSE

Next: End

FUSE INVESTIGATION

PUMP

Next: End

INVESTIGATION FUSE

PUMP

Next: End

FUSE INVESTIGATION

FAN

Next: End

F75 - INCORRECT VOLTAGE PRESSURE

SENSOR - WATER PRESSURE

Next: End

F75

SENSOR - WATER PRESSURE

Next: End

F75

ADAPTOR

Next: End

NOT DETECTING PUMP FLOW

SENSOR - WATER PRESSURE

Next: End

F75 - INCORRECT VOLTAGE PRESSURE INTERMITTENT

SENSOR - WATER PRESSURE

Next: End

F75 INTERMITTENT

SENSOR - WATER PRESSURE

Next: End

F75 INTERMITTENT

ADAPTOR

Next: End

F75 INTERMITTENT - NO FAULT

SENSOR - WATER PRESSURE

Next: End

NOT RUNNING

PUMP

Next: End

THERMISTOR FAULT CODES RETURN SENSOR

HARNESS WIRING X20 AND X25

Next: End

THERMISTOR FAULT CODES FLOW SENSOR

HARNESS WIRING X20 AND X25

Next: End

THERMISTOR FAULT CODES

PCB MAIN

Next: End

NOT RESPONDING TO VARYING AIRFLOW F52, F53

VENTURI

Next: End

NO VOLTAGE AT REST F52, F53

VENTURI

Next: End

F52 F53 FAULT CODE

PCB MAIN

Next: End

NO VOLTAGE TO STEPPER MOTOR F26

PCB MAIN

Next: End

STEPPER MOTOR F26

GAS VALVE

Next: End

F26

PCB MAIN

Next: End

F20

PCB MAIN

Next: End

F20

HARNESS WIRING X20 AND X25

Next: End

F20 2

HARNESS WIRING X20 AND X25

Next: End

F49

EBUS CONTROLS

Next: End

F61

PCB MAIN

Next: End

F61

GAS VALVE

Next: End

F61 (2)

GAS VALVE

Next: End

F61 (3)

GAS VALVE

Next: End

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p1198

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p1200

PRESSURE DOES NOT REACH -1.5MB OR IS POSITIVE

CHARACTERISTIC TEST FROM PRESSURE FAN

Next: p1311

PRESSURE -1.5MB OR GREATER BUT DOES NOT EQUALISE TO 0MB DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE FAN

Next: p1313

VOLTAGE INCORRECT OR MISSING FROM PIN 3 (2 REDS)

CHARACTERISTIC TEST FROM VOLTAGE TO STEPPER MOTOR

Next: !p1316

VOLTAGE PRESENT ON PIN 3 BUT OTHER VOLTAGES INCORRECT OR MISSING

CHARACTERISTIC TEST FROM VOLTAGE TO STEPPER MOTOR

Next: p1318

APPLIANCE COMPLETES SELF CHECK BUT SPANNER SYMBOL IN THE DISPLAY - NO FAULT CODE

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p2008

DISPLAY DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATION

Next: p1444

DISPLAY ILLUMINATES BUT NO INFORMATION / TEXT ON SCREEN

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY OPERATION

Next: p1443

BOILER REACHES TEMP RADIATORS REMAIN COOL OR DO NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1473

BOILER AND RADIATORS FAIL TO REACH SET TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1475

CH DEMAND RECOGNISED BUT FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS CH DEMAND

Next: p2083

CH DEMAND NOT RECOGNISED

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS CH DEMAND

Next: p1486

24 VOLT EXTERNAL CONTROLS FITTED

CHARACTERISTIC TEST FROM OBSERVATION EXTERNAL CONTROLS FITTED

Next: p1508

EBUS CONTROLS FITTED

CHARACTERISTIC TEST FROM OBSERVATION EXTERNAL CONTROLS FITTED

Next: p1510

APPLIANCE RECOGNISES DHW DEMAND BUT OPERATION UNSATISFACTORY

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p1519

APPLIANCE DOES NOT RECOGNISE DHW DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p1521

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1643

BURNER IGNITES BUT DOES NOT ESTABLISH (FLAME SYMBOL DOES NOT APPEAR ON DISPLAY) - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1237

BURNER IGNITES BUT BAFFLES OUT/NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1106

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1898

ADAPTOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p1967

WATER PRESSURE SENSOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p1925

ADAPTOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p1948

WATER PRESSURE SENSOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p1950

GAS RATE INCORRECT

Next: p2029

APPLIANCE MODULATES BEFORE GAS RATE CAN BE TAKEN

Next: p2028

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p2053

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p2055

FAN RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p2076

FAN STILL RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p2121

FAN DOES NOT RUN WITH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p2123

CON X18 PUMP MAIN SUPPLY RESISTANCE NOT AS ABOVE

CHARACTERISTIC TEST FROM RESISTANCE PUMP AND HARNESS

Next: p2138

CON X22 PUMP SPEED CONTROL RESISTANCES NOT AS ABOVE

CHARACTERISTIC TEST FROM RESISTANCE PUMP AND HARNESS

Next: p2140

PUMP PULSES ON AND OFF THEN LOCKOUT F75

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS STANDBY

Next: p2149

WATER PRESSURE SENSOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p2163

ADAPTOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p2165

WATER PRESSURE SENSOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p2184

ADAPTOR RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

Next: !p2186

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS STANDBY

Next: p576

APPLIANCE FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p660

FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p670

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p806

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p808

VOLTAGE INCORRECT OR MISSING FROM PIN 3 (2 REDS)

CHARACTERISTIC TEST FROM VOLTAGE TO STEPPER MOTOR

Next: !p823

VOLTAGE PRESENT ON PIN 3 BUT OTHER VOLTAGES INCORRECT OR MISSING

CHARACTERISTIC TEST FROM VOLTAGE TO STEPPER MOTOR

Next: p825

25/08/2021 12:53:13 2108_1_50_1 23/09/2021 09:27:34

09/09/2021 12:59:52

Next: End

VOLTAGE TO DISPLAY PCB AT MAIN PCB

REMOVE THE DISPLAY HARNESS CONNECTOR FROM THE MAIN PCB

Next: p1023, !f1024

RESISTANCE GAS VALVE TOP SOLENOID AND HARNESS

REMOVE CONNECTOR X25 FROM THE PCB

Next: !p1323, f1324

RESISTANCE GAS VALVE HARNESS TOP SOLENOID

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE TOP SOLENOID (BLACK)

Next: !p1325, !f1326

RESISTANCE GAS VALVE HARNESS BOTTOM SOLENOID

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE BOTTOM SOLENOID (WHITE)

Next: !p1331, !f1332

OBSERVATION DOES FAN RUN CONTINUOUSLY WITH DC HARNESS REMOVED

REMOVE THE DC CONNECTOR FROM THE FAN ASSEMBLY (4 WIRE) AND MAKE SAFE

Next: p1381, f2109

OBSERVATION EXTERNAL CONTROLS FITTED

GAIN ACCESS TO PCB

Next: p1428, f1429

DISCONNECT EBUS CONTROLS

REMOVE EBUS WIRING CONNECTIONS AND MAKE SAFE
REMOVE WIRE LINK BETWEEN THE 24 VOLT CONNECTIONS

Next: !p1430, !f1431

RESISTANCE MAINS SUPPLY FUSE

REMOVE THE MAINS 3A FUSE FROM ITS FOLDER

Next: !p1447, f1448

FUSE FURTHER INVESTIGATION MAINS

Next: !p1449, !f1450

OBSERVATION RE ATTACH X2

REFIT CONNECTOR X2 (BLUE) TO THE PCB

Next: p1453, f1454

OBSERVATION DISCONNECT AIR MASS SENSOR

REFIT CONNECTOR X25
REMOVE CONNECTOR FROM AIR MASS SENSOR AND MAKE SAFE

Next: !p1455, !f1456

VOLTAGE TO DISPLAY PCB AT MAIN PCB

REMOVE THE DISPLAY HARNESS CONNECTOR FROM THE MAIN PCB

Next: !p1461, f1462

RESISTANCE FUSE F1

REMOVE FUSE F1 FROM ITS HOLDER ON THE PCB

Next: !p1463, f1464

FUSE FURTHER INVESTIGATION F1

Next: !p1465, !f1466

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1490, !f1491

VOLTAGE HALL SENSOR

{GAINPCBACS}

Next: p1689, f1690

RESISTANCE FAN HARNESS DC

REMOVE CONNECTOR X20 FROM THE PCB
REMOVE THE DC FAN CONNECTOR (4WIRE) FROM THE FAN ASSEMBLY

Next: !p1691, !f1692

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1802, !f1803

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p1812, !f1813

OBSERVATION DEVICE SPECIFIC NUMBER (DSN)

Next: p1823, !f1824

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p1858, !f1859

VOLTAGE TO LOW PRESSURE SWITCH

Next: p1917, !f1918

OBSERVATION SYSTEM PRESSURE

Next: p1938, !f1939

VOLTAGE TO LOW PRESSURE SWITCH

Next: p1944, !f1945

INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE WATER PRESSURE SENSOR FROM THE ADAPTOR

Next: !p1946, ?1947, ?1949

RESISTANCE CODING RESISTOR

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p1984, !f2133

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p2044, !f2045

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p2051, ?2052, ?2054

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p2070, !f2071

RESISTANCE FAN HARNESS AC

REMOVE CONNECTOR X11 FROM THE PCB
REMOVE THE AC FAN CONNECTOR (3 WIRE) FROM THE FAN ASSEMBLY

Next: !p2100, !f2101

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p2105, !f2106

VOLTAGE AC PERMANENT AT FAN

NO DEMANDS

Next: !p2110, f2111

RESISTANCE FAN HARNESS AC

REMOVE CONNECTOR X11 FROM THE PCB
REMOVE THE AC FAN CONNECTOR (3 WIRE) FROM THE FAN ASSEMBLY

Next: !p2112, !f2113

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR X11 FROM THE PCB

Next: p2135, f2145

RESISTANCE FAN HARNESS AC

REMOVE CONNECTOR X11 FROM THE PCB
REMOVE THE AC FAN CONNECTOR (3 WIRE) FROM THE FAN ASSEMBLY

Next: !p2146, !f2147

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p2156, !f2157

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p2177, !f2178

OBSERVATION PUMP RUNS STANDBY

NO DEMANDS

Next: p2170, ?575, ?2148

OBSERVATION SYSTEM PRESSURE

Next: p1902, !f1913

OBSERVATION SENSORS CORRECTLY FITTED

Next: p709, !f710

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: !p717, !f715

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p716, !f714

OBSERVATION DEVICE SPECIFIC NUMBER (DSN)

Next: p793, !f1866

INSPECTION AIR MASS SENSOR CONNECTION

Next: p803, !f818

VOLTAGE TO STEPPER MOTOR

NO DEMANDS

Next: !p840, ?822, ?824

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p925, f926

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: !p935, !f936

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p933, !f934

OBSERVATION REMOVE EBUS CONNECTOR

REMOVE THE EBUS CONNECTOR FROM THE PCB AND MAKE SAFE

Next: !p939, !f940

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2047, !f2048

RESISTANCE GAS VALVE BOTTOM SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: p974, f976

RESISTANCE GAS VALVE HARNESS BOTTOM SOLENOID

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE BOTTOM SOLENOID (WHITE)

Next: !p981, !f982

RESISTANCE GAS VALVE HARNESS TOP SOLENOID

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE TOP SOLENOID (BLACK)

Next: !p983, !f988

RESISTANCE STEPPER MOTOR HARNESS

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE STEPPER MOTOR

Next: !p984, !f985

RESISTANCE HARNESS DISPLAY PCB

REMOVE DISPLAY HARNESS FROM X51 CONNECTIONS

Next: !p1025, !f1026

FAULT CODES 2

Next: !p1028, !f1029

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p188, !f1070

RESISTANCE CODING RESISTOR GAS GROUP

REMOVE THE CODING RESISTOR FROM THE PCB

Next: !p1236, !f1075

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1050, !f1128

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p1196, ?1197, ?1199

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1205, !f1206

VOLTAGE TO AIR MASS SENSOR

Next: p1201, !f1202

RESISTANCE HARNESS AIR MASS SENSOR

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE CONNECTOR FROM THE MASS FLOW SENSOR

Next: !p1203, !f1204

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: p1211, !f1209

INSPECTION FLUE

Next: !p1213, !f1212

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1238, !f1247

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1990, !f1998

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: p1241, !f1242

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p1243, !f1244

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: !p1245, !f1246

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1304, !f1305

INSPECTION AIR MASS SENSOR

REMOVE AIR INTAKE TUBE

Next: p1306, !f1307

PRESSURE FAN

ATTACH PRESSURE TUBE

Next: p1308, ?1310, ?1312

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p1341, !f1342

INSPECTION CONDENSATE TRAP

Next: p1335, !f1336

VOLTAGE TO STEPPER MOTOR

NO DEMANDS

Next: p1314, ?1315, ?1317

VOLTAGE SOLENOID TOP

NO DEMANDS

Next: p1321, f1322

RESISTANCE STEPPER MOTOR HARNESS

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE STEPPER MOTOR

Next: !p1319, !f1320

VOLTAGE SOLENOID BOTTOM

Next: p1327, !f1328

RESISTANCE GAS VALVE BOTTOM SOLENOID AND HARNESS

REMOVE CONNECTOR X25 FROM THE PCB

Next: p1329, f1330

RESISTANCE CODING RESISTOR GAS GROUP

REMOVE THE CODING RESISTOR FROM THE PCB

Next: !p1333, !f1334

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1337, !f1338

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: !p1339, !f1340

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: !p1343, !f1344

RESISTANCE FAN HARNESS DC

REMOVE CONNECTOR X20 FROM THE PCB
REMOVE THE DC FAN CONNECTOR (4WIRE) FROM THE FAN ASSEMBLY

Next: p1383, !f2117

OBSERVATION FAN RUNS

Next: p2119, ?2120, ?2122

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1424, !f1425

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p1434, !f1435

DISCONNECT EXTERNAL CONTROLS

UNPLUG ALL EXTERNAL

Next: !p1432, !f1433

OBSERVATION HAS THE MAINTENANCE INTERVAL SURPASSED ?

Next: !p1438, !f1439

VOLTAGE TO DISPLAY PCB AT MAIN PCB

REMOVE THE DISPLAY HARNESS CONNECTOR FROM THE MAIN PCB

Next: p1467, !f1468

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p1445, f1446

OBSERVATION REMOVE CONNECTORS FROM PCB

REMOVE CONNECTORS X2 (BLUE) AND X25 (WHITE) FROM THE PCB AND MAKE SAFE

Next: p1451, f1452

VOLTAGE TO DISPLAY PCB AT DISPLAY PCB

Next: !p1459, f1460

OBSERVATION DISCONNECT LOW WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE LOW WATER PRESSURE SWITCH AND MAKE SAFE

Next: !p1457, !f1458

RESISTANCE HARNESS DISPLAY PCB

REMOVE DISPLAY HARNESS FROM X51 CONNECTIONS

Next: !p1469, !f1470

OBSERVATION SYSTEM PRESSURE

Next: p2000, !f2006

OBSERVATION DEVICE SPECIFIC NUMBER (DSN)

Next: p1530, !f1531

OBSERVATION EXTERNAL CONTROLS FITTED

GAIN ACCESS TO PCB

Next: p1506, ?1507, ?1509

VOLTAGE DC SUPPLY TO FAN AT PCB

{GAINPCBACS}
REMOVE 4 WIRE CONNECTOR FROM FAN AND MAKE SAFE

Next: p1488, f1489

VOLTAGE DC PWM DEMAND AT PCB

{GAINPCBACS}
REMOVE 4 WIRE FAN CONNECTOR FROM FAN AND MAKE SAFE

Next: !p2103, f2104

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p1638, !f1639

BYPASS EXTERNAL CONTROLS - 240V

DISCONNECT 240V EXTE

Next: !p1511, !f1512

BYPASS EXTERNAL CONTROLS - 24V

DISCONNECT 24V EXTER

Next: !p1513, !f1514

DISCONNECT EBUS CONTROLS - CH DEMAND

UNPLUG EBUS WIRING CONNECTOR AND MAKE SAFE

Next: !p1515, !f1516

INSPECTION EXTERNAL BYPASS

Next: p1524, !f1525

PUMP LIMPET

Next: p2014, !f2015

OBSERVATION MAXIMUM HEATING POWER

Next: p1532, !f1533

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1534, !f1535

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1536, !f1537

GAS RATE

Next: !p2024, ?2025, ?2027

OBSERVATION IS SPARKING PRESENT

DISCONNECT THE IGNIT

Next: p184, f1688

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: p1693, !f1694

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p1695, !f1696

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1804, !f1805

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1806, !f1807

OBSERVATION SYSTEM PRESSURE

Next: p1808, !f1809

OBSERVATION DOES PUMP RUN

Next: p1810, f1811

PUMP LIMPET

Next: p1816, !f1839

RESISTANCE PUMP MAIN SUPPLY HARNESS

REMOVE CONNECTOR X18

Next: !p1814, !f1815

INSPECTION EXTERNAL BYPASS

Next: p1817, !f1818

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p1819, !f1820

GAS RATE

Next: p1821, f1822

OBSERVATION RUN BOILER TO TEMPERATURE

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE AS SHOWN BY THE RED ARROW
CH SET TO MAX TEMPERATURE

Next: p1825, !f1826

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1829, !f1830

OBSERVATION PUMP OVERRUN FOR OVERHEAT

Next: !p1827, !f1828

INSPECTION CONDENSATE TRAP

Next: p1831, !f1832

INSPECTION FLUE

Next: p1833, !f1834

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1835, !f1836

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: !p1837, !f1838

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1303, !f197

TIGHTNESS TEST INSTALLATION

Next: !p1965, !f1966

INSPECTION CONDENSATE TRAP

Next: p1195, !f254

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p1899, !f1900

OBSERVATION ADJUST SYSTEM PRESSURE

{GAINPCBACS}
LOCATE THE SYSTEM FILLING LOOP

Next: !p2021, f1916

INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE WATER PRESSURE SENSOR FROM THE ADAPTOR

Next: !p1968, ?1922, ?1924

VOLTAGE FROM WATER PRESSURE SENSOR

{GAINPCBACS}

Next: p1940, f1941

OBSERVATION ADJUST PRIMARY SYSTEM PRESSURE

LOCATE SYSTEM FILING LOOP

Next: !p2019, f1943

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p1953, !f1954

INSPECTION CONDENSATE TRAP

Next: p1239, !f1999

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p1522, !f2007

INSPECTION BURNER OFF LINK

Next: p1437, !f2012

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p2016, !f2017

PUMP LIMPET

Next: p2040, !f2041

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p2030, !f2031

INSPECTION CONDENSATE TRAP

Next: p2032, !f2033

INSPECTION FLUE

Next: p2034, !f2035

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p2036, !f2037

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: !p2038, !f2039

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p2042, f2043

COMBUSTION PERFORMANCE ANALYSIS

CONNECT FGA TO THE C

Next: !p2049, f2050

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p2060, !f2061

VOLTAGE TO AIR MASS SENSOR

Next: p2056, !f2057

RESISTANCE HARNESS AIR MASS SENSOR

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE CONNECTOR FROM THE MASS FLOW SENSOR

Next: !p2058, !f2059

INSPECTION CONDENSATE TRAP

Next: p2062, !f2063

INSPECTION FLUE

Next: p2064, !f2065

INSPECTION COMBUSTION SEALS

Next: p2066, !f2067

OBSERVATION CAN COMBUSTION BE ADJUSTED

CONNECT FGA TO THE C

Next: !p2068, f2069

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: !p2072, !f2073

RESISTANCE FAN HARNESS DC

REMOVE CONNECTOR X20 FROM THE PCB
REMOVE THE DC FAN CONNECTOR (4WIRE) FROM THE FAN ASSEMBLY

Next: p2077, !f2078

VOLTAGE DC PERMANENT TO FAN

{GAINPCBACS}
NO DEMANDS

Next: p2079, !f2080

VOLTAGE DC PWM FROM FAN

{GAINPCBACS}

Next: !p2081, !f2082

VOLTAGE AC PERMANENT AT FAN

NO DEMANDS

Next: p1487, f2099

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p2107, !f2108

VOLTAGE HALL SENSOR

{GAINPCBACS}

Next: !p2128, !f2129

VOLTAGE DC PERMANENT TO FAN

{GAINPCBACS}
NO DEMANDS

Next: !p2126, !f2127

VOLTAGE DC PWM DEMAND AT FAN

Next: !p2124, !f2125

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR X22

Next: !p2136, ?2137, ?2139

RESISTANCE PUMP MAIN SUPPLY HARNESS

REMOVE CONNECTOR X18

Next: !p2143, !f2144

RESISTANCE PUMP SPEED CONTROL HARNESS

REMOVE CONNECTOR X22

Next: !p2141, !f2142

OBSERVATION SYSTEM PRESSURE

Next: p2150, !f2151

VOLTAGE TO LOW PRESSURE SWITCH

Next: p2152, !f2153

VOLTAGE FROM WATER PRESSURE SENSOR (F75)

{GAINPCBACS}

Next: p2154, f2155

PUMP LIMPET

Next: p2158, !f2159

INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE WATER PRESSURE SENSOR FROM THE ADAPTOR

Next: p2160, ?2162, ?2164

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: p2166, !f2167

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p2168, !f2169

OBSERVATION SYSTEM PRESSURE

Next: p2171, !f2172

VOLTAGE TO LOW PRESSURE SWITCH

Next: p2173, !f2174

VOLTAGE FROM WATER PRESSURE SENSOR (F75)

{GAINPCBACS}

Next: p2175, f2176

PUMP LIMPET

Next: p2179, !f2180

INSPECTION WATER PRESSURE SENSOR AND ADAPTOR

DRAIN PRIMARY WATER FROM THE APPLIANCE
REMOVE WATER PRESSURE SENSOR FROM THE ADAPTOR

Next: p2181, ?2183, ?2185

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: p2187, !f2188

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p2189, !f2190

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p589, !f590

RESISTANCE PUMP MAIN SUPPLY HARNESS

REMOVE CONNECTOR X18

Next: !p591, !f1756

OBSERVATION FROST PROTECTION STATUS CODE

Next: p1423, f1427

FAULT CODES

Next: p1027, !f671

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p711, f712

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p718, f713

RESISTANCE CODING RESISTOR

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1071, !f2131

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: !p817, ?805, ?807

VOLTAGE TO AIR MASS SENSOR

Next: p809, !f810

RESISTANCE HARNESS AIR MASS SENSOR

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE CONNECTOR FROM THE MASS FLOW SENSOR

Next: !p811, !f812

RESISTANCE STEPPER MOTOR HARNESS

REMOVE CONNECTOR X25 FROM THE PCB
REMOVE THE CONNECTOR FROM THE STEPPER MOTOR

Next: !p826, !f827

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p928, f927

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: p929, !f931

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p930, !f932

RESISTANCE GAS VALVE TOP SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: p975, f977

RESISTANCE GAS VALVE STEPPER MOTOR AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: !p979, f980

System Information

  • Total Tests: 538
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control