XSol Diagnostic System

4704440 VAILLANT ECO TEC PLUS 824 (2012) VUW GB 246/5-5 H

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

4704440 VAILLANT ECO TEC PLUS 824 (2012) VUW GB 246/5-5 H

Next: &3, !f219

OBSERVATION DISPLAY OPERATION

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

Next: &655, f1280

DHW FLOW RATE

Next: &542, f104

OBSERVATION FAN RUNS

Next: &177, f1358

OBSERVATION BURNER IGNITION AND ESTABLISH

Next: &335, ?181, ?183, ?185, ?187

OPERATION DHW

DHW SET TO MAXIMUM T

Next: &444, ?278, ?280, ?282, ?284

FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

ATTACH A U GAUGE TO

Next: &277, ?370, ?372, ?1673

OPERATION CH

FLOW AND RETURN VALVES FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: &495, ?438, ?440, ?442

OBSERVATION CH DEMAND RECOGNISED

BOILER CH THERMOSTAT SET TO MAX

Next: &437, f445

OBSERVATION SYSTEM PRESSURE RISE

BOILER CH THERMOSTAT TO MAX

Next: &499, f496

OBSERVATION CH RE FIRE DELAY

CENTRAL HEATING THER

Next: &501, !f500

OBSERVATION PREHEAT OPERATION

ENSURE APPLIANCE PRI

Next: &nff, ?503, ?505

OBSERVATION DHW DEMAND RECOGNISED

HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: &554, f1536

OBSERVATION PUMP RUNS DHW DEMAND

Next: &137, !f555

OBSERVATION SELF CHECK

NO DEMANDS
ENSURE WARM START TURNED OFF
ENSURE CENTRAL HEATING TURNED OFF

Next: &607, ?659, ?661

HEADER FOR F75 FAULT CODE

Next: &nff, f574

TYPE OF DIAGNOSTIC PROCEDURE

Next: &97, !f608

USER DISPLAY GUIDE

THE USER DISPLAY ON

Next: &556, !f656

HEADER FOR F22, F73, F74

INTENTIONALLY BLANK HEADER

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, f726

HEADER FOR F13

INTENTIONALLY BLANK HEADER

Next: &nff, f762

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 F25, F76

INTENTIONALLY BLANK HEADER

Next: &nff, f842

HEADER FOR F27, F62

INTENTIONALLY BLANK HEADER

Next: &nff, f850

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, f1400

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

SETTING HEATING PARTIAL LOAD PARAMETER

1. PRESS THE

Next: &nff, !f1409

HEADER FOR F77

NOTUESD

Next: &nff, f1530

INFOMRATION ON ACTIVATING MAXIMUM AND MINIMUM OUTPUT TEST MODES

Next: &nff, !f1741

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1745

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f1744

HEADER FOR QUDAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1783

HEADER FOR QADAI GAS VALVE STEPPER MOTOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1780

HEADER FOR QADAI GAS VALVE TOP SOLENOID RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1777

HEADER FOR QADAI GAS VALVE BOTTOM SOLENOID VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1789

HEADER FOR QADAI GAS VALVE BOTTOM SOLENOID RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1774

HEADER FOR QADAI WARMSTART THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1770

HEADER FOR QADAI HOT WATER THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1767

HEADER FOR QADAI RETURN THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1764

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1761

HEADER FOR QADAI DIVTERTER VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1786

HEADER FOR QADAI DIVERTER VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1810

HEADER FOR QADAI DHW FLOW TURBINE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1811

HEADER FOR QADAI GAS VALVE TOP SOLENOID VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f1792

SLOW OR WEAK

PUMP

Next: End

COMMUNICATION FAULT

PCB

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

FROST PROTECTION

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

FROST PROTECTION

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

FAULTY FROST PROTECTION

PCB

Next: End

SENSING DHW DEMAND WHEN NONE

PCB

Next: End

OPERATION CORRECTLY

FROST PROTECTION

Next: End

BAFFLING OUT (BLOCKED)

PIPE - INLET - AIR

Next: End

RESISTANCE OUT OF RANGE

CODING RESISTOR GAS GROUP

Next: End

TO AIR MASS SENSORFAILS PT

HARNESS - WIRING (X20 AND X25)

Next: End

NO VOLTAGE TO AIR MASS SENSORFAILS PT

PCB

Next: End

TO AIR MASS SENSORFAILS PT F93

HARNESS - WIRING (X20 AND X25)

Next: End

NO VOLTAGE TO AIR MASS SENSORFAILS PT F93

PCB

Next: End

DHW TOO COOL RADS COLD EXCESSIVE DIFFERENTIAL

FILTER PRIMARY CIRCUIT

Next: End

EXCESSIVE DIFFERENTIAL AND TEMP RISE FAULT CODE

FILTER PRIMARY CIRCUIT

Next: End

BURNER BAFFLING

GAS INLET PRESSURE

Next: End

BOILER FIRING WITH NO DEMAND

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

NOT OPERATING DIVERTER VALVE

PCB

Next: End

DIVERTER VALVE MOTOR

HARNESS - WIRING (X2)

Next: End

NOT OPERATING DIVERTER VALVE CH

PCB

Next: End

DIVERTER VALVE MOTOR CH

HARNESS - WIRING (X2)

Next: End

BLANK FOR DSN SETTING

Z DIRECTION CHOICE OR CONTINUE

Next: End

POOR DHW FLOW

VALVE (DHW ISOLATOR)

Next: End

NOISY

PUMP

Next: End

NOISY CH

PUMP

Next: End

BOILER TO TEMP RADS COLD

PUMP

Next: End

NO VOLTAGE TO AIR MASS SENSOR

PCB

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

PERFORMANCE TEST FAIL

BURNER

Next: End

PERFORMANCE TEST FAIL

HEAT EXCHANGER PRIMARY

Next: End

PERFORMANCE TEST FAIL

FLUE ASSEMBLY

Next: End

PERFORMANCE TEST FAIL F93

BURNER

Next: End

PERFORMANCE TEST FAIL F93

HEAT EXCHANGER PRIMARY

Next: End

PERFORMANCE TEST FAIL F93

FLUE ASSEMBLY

Next: End

KETTLING ON DHW

FILTER PRIMARY CIRCUIT

Next: End

NOT ESTABLISHING

GAS INLET PRESSURE

Next: End

NOT RECTIFYING

CABLE - IGNITION (ELECTRODE LEAD)

Next: End

NOT RECTIFYING

ELECTRODE

Next: End

CAUSING NO RECTIFICATION

BURNER

Next: End

IGNITES BUT DOES NOT ESTABLISH

PIPE - INLET - AIR

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (MAINS)

Next: End

HIGH FAN PRESSURE

PIPE - INLET - AIR

Next: End

RESTRICTED HIGH FAN PRESSURE

VENTURI AIR MASS SENSOR

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

Next: End

TO BOTTOM SOLENOID

HARNESS - WIRING (X20 AND X25)

Next: End

STOPPING BURNER LIGHTING

CODING RESISTOR GAS GROUP

Next: End

RESTRICTED FAN PRESSURE

CONDENSATE 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

NO DEMAND TO FAN

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

NO DEMAND FOR FAN

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

FAN NOT RUNNING

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

DEMAND TO FAN

HARNESS - WIRING (X20 AND X25)

Next: End

NO DEMAND TO FAN 2

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

NO DEMAND FOR FAN 2

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

FAN NOT RUNNING 2

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

F32 FAULT CODE

HARNESS - WIRING (X20 AND X25)

Next: End

HALL SENSOR SIGNAL F32

FAN

Next: End

NOT GIVING DEMAND TO FAN F32

PCB

Next: End

F32 NO DEMAND TO RUN FAN

PCB

Next: End

FUSE INVESTIGATION

PUMP

Next: End

CH REMAINING TOO COOL

PCB

Next: End

PARTIAL OAD SETTING

Z DIRECTION CHOICE OR CONTINUE

Next: End

PUMP PULSING

SYSTEM PRESSURE

Next: End

NO POWER TO LOW PRESSURE SWITCH

PCB

Next: End

LOW WATER PRESSURE SWITCH

HARNESS - WIRING (X2)

Next: End

FAULT CODE F75

AIR VENT - AUTOMATIC

Next: End

FAULT CODE F75

EXPANSION VESSEL

Next: End

FAULT CODE F75

FILTER PRIMARY CIRCUIT

Next: End

FAULT CODE F75

SYSTEM PRESSURE

Next: End

FAULT CODE F75

PCB

Next: End

FAULT CODE F75

HARNESS - WIRING (X2)

Next: End

FAULT CODE F75

PUMP

Next: End

FAULT CODE F75 2

AIR VENT - AUTOMATIC

Next: End

FAULT CODE F75 2

EXPANSION VESSEL

Next: End

FAULT CODE F75 2

FILTER PRIMARY CIRCUIT

Next: End

DC HALL SENSOR

HARNESS - WIRING (X20 AND X25)

Next: End

SPARKING

CABLE - IGNITION (ELECTRODE LEAD)

Next: End

SPARKING

ELECTRODE

Next: End

DC HALL SENSORZ

HARNESS - WIRING (X20 AND X25)

Next: End

SPARKINGZ

CABLE - IGNITION (ELECTRODE LEAD)

Next: End

SPARKINGZ

ELECTRODE

Next: End

FAULT CODE F77

CONDENSATE PUMP

Next: End

DOES NOT RUN

PUMP

Next: End

NO VOLTAGE TO AQUA SENSOR

PCB

Next: End

TO AQUA SENSOR

HARNESS - WIRING (X2)

Next: End

NOT RECOGNISING DHW DEMAND

SENSOR FITMENT

Next: End

OUT OF CAL STOPING DHW DEMAND RECOGNITION

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

OUT OF CAL STOPPING DHW DEMAND RECOGNITION

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

NOT RECOGNISING DEMAND

BURNER OFF LINK

Next: End

NO VOLTAGE TO AQUA SENSOR3

PCB

Next: End

TO AQUA SENSOR3

HARNESS - WIRING (X2)

Next: End

NOT RECOGNISING DHW DEMAND3

SENSOR FITMENT

Next: End

OUT OF CAL STOPING DHW DEMAND RECOGNITION3

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

OUT OF CAL STOPPING DHW DEMAND RECOGNITION3

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

NO 5V OR 22V LINE

PCB

Next: End

HARNESS SHORTED ANDDAMAGED PCB DBREF 13677 (3)

HARNESS - WIRING X20/X25 AND PCB

Next: End

HARNESS SHORTED AND DAMAGED PCB DBREF 13677 (2)

HARNESS - WIRING X20/X25 AND PCB

Next: End

HARNESS SHORTED AND DAMAGED PCB DBREF 13677

HARNESS - WIRING X20/X25 AND PCB

Next: End

HARNESS X2

HARNESS - WIRING (X2)

Next: End

PCB MAIN

PCB

Next: End

BLANK DISPLAY AT STARTUP

HARNESS - WIRING (X20 AND X25)

Next: End

FUSE F1

Next: End

BAFFLING OUT (BLOCKED) DB REF 15027

PIPE - INLET - AIR

Next: End

BAFFLING DB REF 15027

CONDENSATE TRAP

Next: End

NO VOLTAGE TO AIR MASS SENSOR DB REF 15027

PCB

Next: End

TO AIR MASS SENSOR DB REF 15027

HARNESS - WIRING (X20 AND X25)

Next: End

BAFFLING DB REF 15027

BURNER

Next: End

BAFFLING DB REF 15027

HEAT EXCHANGER PRIMARY

Next: End

BAFFLING DB REF 15027

FLUE ASSEMBLY

Next: End

BAFFLING OUT (BLOCKED) DB REF 15027 (2)

PIPE - INLET - AIR

Next: End

BAFFLING DB REF 15027 (2)

CONDENSATE TRAP

Next: End

NO VOLTAGE TO AIR MASS SENSOR DB REF 15027 (2)

PCB

Next: End

TO AIR MASS SENSOR DB REF 15027 (2)

HARNESS - WIRING (X20 AND X25)

Next: End

BAFFLING DB REF 15027 (2)

BURNER

Next: End

BAFFLING DB REF 15027 (2)

HEAT EXCHANGER PRIMARY

Next: End

BAFFLING DB REF 15027 (2)

FLUE ASSEMBLY

Next: End

BLANK FOR TEST MODES INFORMATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

QADAI

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

QADAI

SENSOR - NTC - HEAT EXCHANGER (WARM START)

Next: End

QADAI

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

QADAI BOTTOM SOLENOID

GAS SECTION

Next: End

QADAI TOP SOLENOID

GAS SECTION

Next: End

QADAI STEPPER MOTOR

GAS SECTION

Next: End

QADAI

PUMP

Next: End

QADAI

VALVE - DIVERTER - BRASS (MOTOR)

Next: End

QADAI GAS VALVE TOP SOLENOID VOLTAGE

PCB

Next: End

QADAI GAS VALVE BOTTOM SOLENOID VOLTAGE

PCB

Next: End

QADAI VOLTAGE TO DIVERTER MOTOR

PCB

Next: End

QADAI

SENSOR - FLOW

Next: End

BURNER NOT IGNITING

GAS INLET PRESSURE

Next: End

BLANK FOR CASE OFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

BAFFLING

CONDENSATE TRAP

Next: End

DHW OPERATION

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

DHW OPERATION

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

DHW TOO HOT

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

NOT RESPONDING TO CH DEMAND

Next: End

DHW TOO COOL

SENSOR - NTC - FLOW (DHW SENSOR)

Next: End

DHW TOO COOL

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

DHW TOO COOL

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

NOT RESPONDING TO CH DEMAND2

Next: End

PERFORMANCE TEST FAIL

PIPE - INLET - AIR

Next: End

NOT RESPONDING TO CH DEMANDDEMAND RECOGNISED

Next: End

NO POWER TO 24V CONTROLS

PCB

Next: End

NO POWER TO 24V CONTROLS2

PCB

Next: End

NO VOLTAGE TO 24V CONTROLS3

PCB

Next: End

CH NOISY

FLOW AND RETURN VALVES

Next: End

SHUT CAUSING CH NOISE

BY-PASS

Next: End

TURNED OFF

FLOW AND RETURN VALVES

Next: End

CH STAYING TOO COOL

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

CH STAYING TOO COOL

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

FLAT

EXPANSION VESSEL

Next: End

CH DELAY FUNCTION

PCB

Next: End

BOILER NOT RECOGNISING FACILITY

SENSOR - NTC - HEAT EXCHANGER (WARM START)

Next: End

WARMSTART ISSUES

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

WARMSTART ISSUES

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

WARM START NOT HOT ENOUGH

SENSOR - NTC - HEAT EXCHANGER (WARM START)

Next: End

OPEN TOO MUCH SO RADS DONT HEAT

Next: End

OPEN TOO MUCH SO BYPASSING RADS

BY-PASS

Next: End

PUMP DOES NOT RUN WITH DEMAND

PCB

Next: End

NO POWER TO PUMP

PCB

Next: End

NO POWER TO PUMP 2

PCB

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

NOT OPENING TO RADS POSITION

VALVE - DIVERTER - BRASS

Next: End

F22 F73 F74

SYSTEM PRESSURE

Next: End

NO POWER TO LOW PRESSURE SWITCH 2

PCB

Next: End

F22 F73 F74

HARNESS - WIRING (X2)

Next: End

F00 F01 F10 F11 F64 F71 F85

SENSOR FITMENT

Next: End

FAULT CODES

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

FAULT CODES

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

NO POWER TO 24V CONTROLS F23 F24 F83 F84

PCB

Next: End

NOT RESPONDING TO CH DEMAND F23 F24 F83 F84

Next: End

F23 F24 F83 F84

SYSTEM PRESSURE

Next: End

F23 F24 F83 F84

SENSOR FITMENT

Next: End

F23 F24 F83 F84

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

F23 F24 F83 F84

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

WEAK

PUMP

Next: End

F13

SENSOR - NTC - HEAT EXCHANGER (WARM START)

Next: End

CLOSED TOO MUCH NOISY

Next: End

CLOSED TOO MUCH RAISING DIFFERENTIAL

Next: End

CLOSED TOO MUCH OR BLOCKED

BY-PASS

Next: End

BLANK FOR PCBS REPLACED

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO VOLTAGE TO AIR MASS SENSOR F52, F53

PCB

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

F25 F76

HARNESS SAFETY FUSE

Next: End

PASSING SOLENOIDS

GAS SECTION

Next: End

F27 F62

ELECTRODE

Next: End

F20

CABLE - IGNITION (ELECTRODE LEAD)

Next: End

F20

ELECTRODE

Next: End

F20

SENSOR - NTC - CH FLOW/RETURN (FLOW)

Next: End

F20

SENSOR - NTC - CH FLOW/CH RETURN (RETURN)

Next: End

F49

PCB

Next: End

PERFORMANCE TEST FAIL F93

PIPE - INLET - AIR

Next: End

F61

HARNESS - WIRING (X20 AND X25)

Next: End

F61 (3)

HARNESS - WIRING (X20 AND X25)

Next: End

CODING RESISTOR OUTPUT

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

TAP OPEN OR LEAKING DHW DRAW OFF

Next: End

NO VOLTAGE AT RESTFAILS PT

VENTURI AIR MASS SENSOR

Next: End

NO VOLTAGE AT RESTFAILS PT F93

VENTURI AIR MASS SENSOR

Next: End

NOISY

HEAT EXCHANGER PRIMARY

Next: End

DHW TOO COOL

HEAT EXCHANGER PRIMARY

Next: End

DHW TOO COOL

HEAT EXCHANGER - DHW

Next: End

F23 F24 F83 F84

HEAT EXCHANGER - DHW

Next: End

HEAT EXCHANGER - DHW

Next: End

FLOW LIMITER

LIMITER (FLOW RESTRICTOR)

Next: End

BOILER FIRING WITH NO DEMAND

HARNESS - WIRING (X2)

Next: End

PASSING TO RADS

VALVE - DIVERTER - BRASS (MOTOR)

Next: End

PASSING TO RADS CH

VALVE - DIVERTER - BRASS (MOTOR)

Next: End

FILTER DHW

Next: End

NOT RESPONDING TO VARYING AIRFLOW

VENTURI AIR MASS SENSOR

Next: End

NO VOLTAGE AT REST

VENTURI AIR MASS SENSOR

Next: End

BAFFLING

GAS SECTION

Next: End

PERFORMANCE TEST FAIL

GAS SECTION

Next: End

PERFORMANCE TEST FAIL F93

GAS SECTION

Next: End

NOISY

HEAT EXCHANGER - DHW

Next: End

F42 F70 F90

PCB

Next: End

NOT RECOGNISING RECTIFICATION

PCB

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION MAINS

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO VOLTAGE TO STEPPER MOTOR

PCB

Next: End

STEPPER MOTOR

GAS SECTION

Next: End

NOT SWITCHING TOP SOLENOID

PCB

Next: End

TOP SOLENOID GONE

GAS SECTION

Next: End

BOTTOM SOLENOID NOT OPENING

GAS SECTION

Next: End

NOT OPENING ELECTRICALLY SOUND

GAS SECTION

Next: End

RESTRICTED FAN PRESSURE

FLUE ASSEMBLY

Next: End

SPARKING NOT LIGHTING WRONG MIX

GAS SECTION

Next: End

NO DEMAND TO FAN FROM PCB

PCB

Next: End

NOT RUNNING WITH CORRECT VOLTAGES

FAN

Next: End

NO DEMAND TO FAN FROM PCB 2

PCB

Next: End

F32 NO PICKING UP FAN RUNNING

PCB

Next: End

NOT RUNNING WITH CORRECT VOLTAGES F32

FAN

Next: End

FUSE INVESTIGATION

PCB - FUSE

Next: End

BOILER AND SYS COOL

PARTIAL LOAD SETTING

Next: End

FAULT CODE F75

SENSOR - WATER PRESSURE

Next: End

FAULT CODE F75 3

SENSOR - WATER PRESSURE

Next: End

FAULT CODE F75 2

SENSOR - WATER PRESSURE

Next: End

FAULT CODE F75 4

SENSOR - WATER PRESSURE

Next: End

HALL SENSOR SIGNAL

FAN

Next: End

NOT SPARKING

PCB

Next: End

NO SPARKING

CONDENSATE PUMP

Next: End

HALL SENSOR SIGNALZ

FAN

Next: End

NOT SPARKINGZ

PCB

Next: End

FAULT CODE F77

PCB

Next: End

FAULT CODE F77 2

PCB

Next: End

NOT SENSING DEMAND

SENSOR - FLOW

Next: End

NOT RECOGNISING DEMAND

PCB

Next: End

DHW DEMAND

CONDENSATE PUMP

Next: End

NOT SENSING DEMAND3

SENSOR - FLOW

Next: End

NOT RECOGNISING DEMAND3

PCB

Next: End

STEPPER MOTOR HAS DAMAGED PCB DBREF 13677

GAS VALVE AND PCB

Next: End

BOTTOM SOLENOID HAS DAMAGED PCB DBREF 13677

GAS VALVE AND PCB

Next: End

TOP SOLENOID DAMAGED PCB DBREF 13677

GAS VALVE AND PCB

Next: End

LOW WATER PRESSURE SWITCH

SENSOR - WATER PRESSURE

Next: End

DISPLAY PCB

DISPLAY - PLUS

Next: End

HARNESS DISPLAY PCB

CABLE - DISPLAY

Next: End

VENTURI AIR MASS SENSOR

Next: End

FURTHER INVESTIGATION FUSE F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT RESPONDING TO VARYING AIRFLOW DB REF 15027

VENTURI AIR MASS SENSOR

Next: End

NO VOLTAGE AT REST DB REF 15027

VENTURI AIR MASS SENSOR

Next: End

BAFFLING DB REF 15027

GAS SECTION

Next: End

NOT RESPONDING TO VARYING AIRFLOW DB REF 15027 (2)

VENTURI AIR MASS SENSOR

Next: End

NO VOLTAGE AT REST DB REF 15027 (2)

VENTURI AIR MASS SENSOR

Next: End

BAFFLING DB REF 15027 (2)

GAS SECTION

Next: End

FLOW THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

RETURN THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

DHW SENSOR

RESULT AS EXPECTED

Next: End

WARMSTART SENSOR

RESULT AS EXPECTED

Next: End

GAS VALVE BOTTOM SOLENOID

RESULT AS EXPECTED

Next: End

GAS VALVE TOP SOLENOID

RESULT AS EXPECTED

Next: End

GAS VALVE STEPPER MOTOR

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

DIVERTER VALVE MOTOR

RESULT AS EXPECTED

Next: End

PCB GAS VALVE VOLTAGE TOP SOLENOID

RESULT AS EXPECTED

Next: End

PCB GAS VALVE VOLTAGE BOTTOM SOLENOID

RESULT AS EXPECTED

Next: End

DHW FLOW TURBINE

RESULT AS EXPECTED

Next: End

PCB VOLTAGE TO DIVERTER VALVE

RESULT AS EXPECTED

Next: End

NOT CONTROLLING HW TEMP

PCB

Next: End

DHW SENSOR

HARNESS - WIRING (X2)

Next: End

NOT RESPONDING TO 240V CONTROLS

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS

PCB

Next: End

PASSING TO RADS

VALVE - DIVERTER - BRASS

Next: End

TOO LOW FOR PERFORMANCE TEST

GAS INLET PRESSURE

Next: End

PERFORMANCE ANALYSIS FAIL

VENTURI AIR MASS SENSOR

Next: End

PERFORMANCE TEST FAIL

COMBUSTION ADJUSTMENT

Next: End

DHW TOO COOL

HARNESS - WIRING (X2)

Next: End

DHW TOO COOL

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS2

PCB

Next: End

NOT RESPONDING TO 240V CONTROLS2

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS3

PCB

Next: End

NOT RESPONDING TO 240V CONTROLS3

PCB

Next: End

NOT RESPONDING TO CH DEMAND

Next: End

NOT RESPONDING TO CH DEMAND2

Next: End

NOT SHUTTING BURNER DOWN ON CH

PCB

Next: End

SCALED-NOISY

HEAT EXCHANGER PRIMARY

Next: End

NOISY CH

Next: End

NOT RESPONDING TO CH DEMAND3

Next: End

BLOCKED

EXPANSION VESSEL PIPE

Next: End

NOT RECOGNISING WARM START FACILITY

PCB

Next: End

WARM START SENSOR

HARNESS - WIRING (X2)

Next: End

NOT HEATING ENOUGH ON WARMSTART

PCB

Next: End

NOT RUNNING

PUMP

Next: End

BOILER TO TEMP BUT RADS COOL

Next: End

PCB NOT RECOGNISING SYSTEM PRESSURE

PCB

Next: End

F22 F73 F74 FAULT CODES

SENSOR - WATER PRESSURE

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

Next: End

DHW TOO COOLF23 F24 F83 F84

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS2 F23 F24 F83 F84

PCB

Next: End

NOT RESPONDING TO CH DEMAND F23 F24 F83 F84

Next: End

NOT RESPONDING TO 240V CONTROLS 2F23 F24 F83 F84

PCB

Next: End

F13

PCB

Next: End

F13

HARNESS - WIRING (X2)

Next: End

F23 F24 F83 F84

HEAT EXCHANGER PRIMARY

Next: End

NOT RESPONDING TO VARYING AIRFLOW F52, F53

VENTURI AIR MASS SENSOR

Next: End

NO VOLTAGE AT REST F52, F53

VENTURI AIR MASS SENSOR

Next: End

F52 F53 FAULT CODE

PCB

Next: End

NO VOLTAGE TO STEPPER MOTOR F26

PCB

Next: End

STEPPER MOTOR F26

GAS SECTION

Next: End

F26

PCB

Next: End

F25 F76

PCB

Next: End

F25 F76

HARNESS - WIRING (X20 AND X25)

Next: End

F25 F76

SAFETY FUSE

Next: End

F27 F62

PCB

Next: End

F20

PCB

Next: End

F20

HARNESS - WIRING (X20 AND X25)

Next: End

F20 2

HARNESS - WIRING (X20 AND X25)

Next: End

F49

Next: End

TOO LOW FOR PERFORMANCE TEST F93

GAS INLET PRESSURE

Next: End

PERFORMANCE ANALYSIS FAIL F93

VENTURI AIR MASS SENSOR

Next: End

PERFORMANCE TEST FAIL F93

COMBUSTION ADJUSTMENT

Next: End

PERFORMANCE TEST FAIL F93

PCB

Next: End

F61

PCB

Next: End

F61

GAS SECTION

Next: End

F61 (2)

GAS SECTION

Next: End

F61 (3)

GAS SECTION

Next: End

TO CODING RESISTOR

HARNESS - WIRING (X20 AND X25)

Next: End

LIMITER BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW LIMITER AND FILTER

Next: !p114

FILTER BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW LIMITER AND FILTER

Next: !p116

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

PUMP RUNS OR F75 OCCURING INTERMITTENTLY

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS STANDBY

Next: p1411

INLET PRESSURE SATISFACTORY BUT BURNER DROPS OUT ON MINIMUM

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: p1675

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p1683

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p1685

INLET PRESSURE SATISFACTORY BUT BURNER DROPS OUT ON MINIMUM

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: p1719

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p1727

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p1729

SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1507

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p184

BURNER IGNITES BUT DOES NOT ESTABLISH - 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

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p279

DHW TOO COOL RADS REMAIN COOL WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p398

DHW TOO COOL RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p283

BOILER NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1163

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM CH OPERATION (NOISY?)

Next: p312

BOILER STILL NOISY

CHARACTERISTIC TEST FROM CH OPERATION (NOISY?)

Next: !p1096

INLET PRESSURE UNSATISFACTORY

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: !p371

INLET PRESSURE SATISFACTORY BUT FGA READINGS OUTSIDE MANUFACTURERS LIMITS

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: p373

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p379

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p378

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: !p1099

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM CH OPERATION (NOISY?)

Next: p413

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p439

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p470

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p443

DIFFERENTIAL INCORRECT OR LOCAL NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER FOR CH NOISE

Next: !p465

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER FOR CH NOISE

Next: !p467

BOILER DOES NOT GIVE THE OPTION OF ACTIVATING WARMSTART

CHARACTERISTIC TEST FROM OBSERVATION PREHEAT OPERATION

Next: p504

BOILER DOES NOT HEAT SUFFICIENTLY ON WARM START

CHARACTERISTIC TEST FROM OBSERVATION PREHEAT OPERATION

Next: p506

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION PUMP RUNS STANDBY

Next: p576

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p660

FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION SELF CHECK

Next: p670

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p779

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM CH OPERATION (NOISY?)

Next: p746

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

INLET PRESSURE UNSATISFACTORY

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: !p944

INLET PRESSURE SATISFACTORY BUT FGA READINGS OUTSIDE MANUFACTURERS LIMITS

CHARACTERISTIC TEST FROM FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

Next: p946

NO VOLTAGE PRESENT

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: p949

VOLTAGE PRESENT BUT DOES NOT INCREASE WHEN FAN RUNS

CHARACTERISTIC TEST FROM VOLTAGES AIR MASS SENSOR OPERATION

Next: !p951

23/09/2022 12:38:04 2203_1_50_1 21/11/2022 09:16:05

16/11/2022 15:13:05

Next: End

VOLTAGE TO DISPLAY PCB AT MAIN PCB

REMOVE THE DISPLAY HARNESS CONNECTOR FROM THE MAIN PCB

Next: p1023, !f1024

INSPECTION DHW ISOLATION VALVE

Next: p111, !f117

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p1140, !f1141

VOLTAGE DIVERTER VALVE

REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR AND MAKE SAFE
NO DEMANDS

Next: p1153, !f1151

VOLTAGE DIVERTER VALVE

REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR AND MAKE SAFE
NO DEMANDS

Next: p1157, !f1158

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p1638, f1282

RESISTANCE MAINS SUPPLY FUSE

REMOVE THE MAINS 3A FUSE FROM ITS FOLDER

Next: !p1283, f1284

FUSE FURTHER INVESTIGATION MAINS

Next: !p1285, !f1286

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

VOLTAGE DC SUPPLY TO FAN AT PCB

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

Next: p1359, f1373

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1362, !f1363

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1374, !f1375

RESISTANCE FAN HARNESS DC

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

Next: p1381, !f1382

VOLTAGE DC SUPPLY TO FAN AT PCB

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

Next: p1396, !f1399

RESISTANCE PUMP AND HARNESS_FUSE

REMOVE CONNECTOR X18 FROM THE PCB

Next: !p1401, !f1402

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

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

Next: !p1506, !f1479

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

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

Next: !p1495, !f1496

RESISTANCE FAN HARNESS DC

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

Next: !p1511, !f1512

DISCONNECT X40 DOES SPARKING OCCUR?

REMOVE CONNECTOR X40 FROM THE PCB AND MAKE SAFE

Next: !p1518, f1520

VOLTAGE HALL SENSOR

{GAINPCBACS}

Next: p1521, f1522

RESISTANCE FAN HARNESS DC

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

Next: !p1523, !f1524

OBSERVATION CONNECTOR X40 (CONDENSATE PUMP)

GAIN ACCESS TO PCB

Next: !p1531, f1532

OBSERVATION F77 RESET (CONDENSATE PUMP DISCONNECTED)

REMOVE CONDENSATE PUMP CONNECTOR FROM X40 AND MAKE SAFE

Next: !p1533, !f1534

OBSERVATION CONNECTOR X100 (CONDENSATE PUMP)

GAIN ACCESS TO PCB

Next: p1537, f1552

VOLTAGE TO AQUA SENSOR

Next: p1540, !f1541

DISCONNECT X100 (BLUE) CONDENSATE PUMP - DHW DEMAND RECOGNISED?

REMOVE CONNECTOR X100 (BLUE) FROM THE PCB AND MAKE SAFE, CONNECT A WIRE LINK BETWEEN THE CONNECTIONS

Next: !p1553, f1555

VOLTAGE DEMAND FROM AQUA SENSOR

{GAINPCBACS}
HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: p1556, f1557

VOLTAGE TO AQUA SENSOR

Next: p1558, !f1559

VOLTAGE 22V AND 5V LINES X2 DISCONNECTED

REMOVE CONNECTOR X2 (BLUE) FROM THE PCB

Next: p1608, f1609

VOLTAGE 22V AND 5V LINES X25 DISCONNECTED

REMOVE CONNECTOR X25 (WHITE) FROM THE PCB

Next: p1610, !f1611

RESISTANCE STEPPER MOTOR HARNESS

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

Next: !p1614, !f1615

RESISTANCE GAS VALVE HARNESS BOTTOM SOLENOID

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

Next: !p1618, !f1619

RESISTANCE GAS VALVE HARNESS TOP SOLENOID

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

Next: !p1622, !f1623

VOLTAGE TO DISPLAY PCB AT MAIN PCB

REMOVE THE DISPLAY HARNESS CONNECTOR FROM THE MAIN PCB

Next: !p1630, !f1631

FUSE FURTHER INVESTIGATION F1

Next: !p1671, !f1672

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: !p1762, !f1763

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p1765, !f1766

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p1768, !f1773

RESISTANCE WARM START SENSOR

REMOVE THE CONNECTOR FROM THE WARM START SENSOR

Next: !p1771, !f1772

RESISTANCE GAS VALVE BOTTOM SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: !p1775, !f1776

RESISTANCE GAS VALVE TOP SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: !p1778, !f1779

RESISTANCE GAS VALVE STEPPER MOTOR AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: !p1781, !f1782

RESISTANCE PUMP AND HARNESS_FUSE

REMOVE CONNECTOR X18 FROM THE PCB

Next: !p1784, !f1785

RESISTANCE DIVERTER VALVE MOTOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p1787, !f1788

VOLTAGE SOLENOID BOTTOM

Next: !p1795, !f1796

VOLTAGE SOLENOID TOP

NO DEMANDS

Next: !p1793, !f1794

VOLTAGE DIVERTER VALVE

REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR AND MAKE SAFE
NO DEMANDS

Next: !p1816, !f1812

VOLTAGE DEMAND FROM AQUA SENSOR

{GAINPCBACS}
HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: !p1814, !f1815

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p297, !f298

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p319, f452

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p401, !f402

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED BY RED ARROWS
BOILER CH THERMOSTAT SET TO MAX

Next: p1100, ?410, ?412

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p416, f454

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1214, !f436

240V OR 24V CONTROLS?

{GAINPCBACS}

Next: p446, f447

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p448, f453

VOLTAGE TO 24V EXTERNAL CONTROLS

Next: !p457, !f458

VOLTAGE TO 24V EXTERNAL CONTROLS

Next: !p494, !f460

VOLTAGE TO 24V EXTERNAL CONTROLS

Next: !p455, !f456

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p497, !f498

RESISTANCE WARM START SENSOR

REMOVE THE CONNECTOR FROM THE WARM START SENSOR

Next: !p509, !f510

OBSERVATION PUMP RUNS STANDBY

Next: p1428, ?575, ?1410

OBSERVATION SYSTEM PRESSURE

Next: p700, !f699

VOLTAGE TO LOW PRESSURE SWITCH

Next: p703, !f704

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 SYSTEM PRESSURE

Next: p732, !f755

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED BY RED ARROWS
BOILER CH THERMOSTAT SET TO MAX

Next: p1103, ?743, ?745

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p749, f750

VOLTAGE TO 24V EXTERNAL CONTROLS

Next: !p751, !f752

RESISTANCE WARM START SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p763, f764

RESISTANCE WARM START SENSOR

REMOVE THE CONNECTOR FROM THE WARM START SENSOR

Next: !p765, !f766

PCBS REPLACED?

Next: p793, !f800

RESISTANCE CODING RESISTOR

DISCONNECT THE INLINE CONNECTOR TO THE SAFETY FUSE AND CODING RESISTOR

Next: !p986, !f987

INSPECTION AIR MASS SENSOR CONNECTION

Next: p803, !f818

VOLTAGE TO STEPPER MOTOR

NO DEMANDS

Next: !p840, ?822, ?824

RESISTANCE SAFETY FUSE AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p843, f844

RESISTANCE SAFETY FUSE AND SAFETY FUSE HARNESS

DISCONNECT THE INLINE CONNECTOR TO THE SAFETY FUSE HARNESS FROM THE MAIN BOILER HARNESS

Next: !p845, f846

RESISTANCE SAFETY FUSE HARNESS

DISCONNECT THE INLIN

Next: !p847, !f848

TIGHTNESS TEST INSTALLATION

Next: p852, !f851

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

FGA MAXIMUM, MINIMUM AND PRESSURE GAS INLET

ATTACH A U GAUGE TO

Next: !p966, ?943, ?945, ?1718

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1223, !f959

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

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1034, !f1035

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1036, !f1037

OBSERVATION DHW DEMAND INCORRECTLY RECOGNISED

HOT WATER TAPS OFF

Next: p1038, !f1039

OBSERVATION ISOLATE MAINS WATER - DEMAND STOPS?

ENSURE LEFT HAND FILLING TAP CLOSED
TURN RIGHT HAND FILLING TAP TO THE OPEN POSITION

Next: !p1040, !f1041

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

RESISTANCE HARNESS AIR MASS SENSOR

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

Next: !p1078, !f1079

RESISTANCE HARNESS AIR MASS SENSOR

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

Next: !p1083, !f1084

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p1101, !f1102

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p1104, !f1105

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1050, !f1128

INSPECTION FLOW LIMITER AND FILTER

DHW SUPPLY ISOLATED

Next: !p112, ?113, ?115

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1033, f1139

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p1154, !f1155

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p1159, !f1160

LIMPET CHECK

Next: p285, !f1178

LIMPET CHECK

Next: p461, !f1189

LIMPET CHECK

Next: p535, !f1194

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 BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1215, !f1216

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: p1220, !f1218

INSPECTION FLUE

Next: !p1222, !f1221

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1224, !f1225

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: p1229, !f1227

INSPECTION FLUE

Next: !p1231, !f1230

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p1233, !f1234

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1238, !f1247

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1239, !f1240

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

VOLTAGE DC PWM DEMAND AT PCB

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

Next: p1370, f1361

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1364, !f1365

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p1366, !f1367

RESISTANCE FAN HARNESS DC

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

Next: !p1371, !f1372

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1376, !f1377

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p1378, !f1379

OBSERVATION FAN RUNS

Next: p1383, f1395

VOLTAGE HALL SENSOR

{GAINPCBACS}

Next: !p1393, !f1394

VOLTAGE DC PWM DEMAND AT PCB

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

Next: !p1397, !f1398

OBSERVATION HEATING PARTIAL LOAD SETTING (PARAMETER D.000)

ENSURE NO DEMANDS

Next: !p1406, !f1407

OBSERVATION SYSTEM PRESSURE

Next: p1489, !f1490

OBSERVATION SYSTEM PRESSURE

Next: p1473, !f1430

VOLTAGE TO LOW PRESSURE SWITCH

Next: p1474, !f1475

VOLTAGE FROM LOW PRESSURE SENSOR

Next: p1480, f1477

CHECK PUMP OPERATION

REMOVE VENT PLUG FRO

Next: p1481, !f1535

INSPECTION AUTO AIR VENT / AIR IN SYSTEM

Next: p1483, !f1484

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: p1485, !f1486

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p1487, !f1488

VOLTAGE TO LOW PRESSURE SWITCH

Next: p1491, !f1492

VOLTAGE FROM LOW PRESSURE SENSOR

Next: p1493, f1494

LIMPET CHECK

Next: p1499, !f1498

INSPECTION AUTO AIR VENT / AIR IN SYSTEM

Next: p1500, !f1501

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: p1502, !f1503

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p1504, !f1505

OBSERVATION CONNECTOR X40 (CONDENSATE PUMP)

GAIN ACCESS TO PCB

Next: p1508, f1517

VOLTAGE HALL SENSOR

{GAINPCBACS}

Next: p1509, f1510

RESISTANCE IGNITION LEAD

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

Next: p1513, !f1514

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p1515, !f1516

RESISTANCE IGNITION LEAD

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

Next: p1525, !f1526

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p1527, !f1528

VOLTAGE DEMAND FROM AQUA SENSOR

{GAINPCBACS}
HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: p1538, f1539

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1544, !f1545

RESISTANCE CHECK AQUA SENSOR HARNESS

REMOVE THE CONNECTOR FROM THE AQUA SENSOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: !p1542, !f1543

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1546, !f1547

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1548, !f1549

INSPECTION BURNER OFF LINK

Next: !p1550, !f1551

OBSERVATION SENSORS CORRECTLY FITTED

Next: p1562, !f1563

RESISTANCE CHECK AQUA SENSOR HARNESS

REMOVE THE CONNECTOR FROM THE AQUA SENSOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: !p1560, !f1561

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p1564, !f1565

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p1571, !f1567

VOLTAGE 22V AND 5V LINES

Next: p1606, f1607

VOLTAGE TO DISPLAY PCB AT DISPLAY PCB

Next: !p1628, f1629

VOLTAGE 22V AND 5V LINES LOW WATER PRESSURE SWITCH DISCONNECTED

REMOVE THE CONNECTOR

Next: !p1626, !f1627

RESISTANCE GAS VALVE STEPPER MOTOR AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: p1612, f1613

RESISTANCE GAS VALVE BOTTOM SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: p1616, f1617

RESISTANCE GAS VALVE TOP SOLENOID AND HARNESS AND TO EARTH

REMOVE CONNECTOR X25 FROM THE PCB

Next: p1620, f1621

VOLTAGE 22V AND 5V LINES AIR MASS SENSOR DISCONNECTED

REMOVE CONNECTOR FRO

Next: !p1636, !f1637

RESISTANCE FUSE F1

REMOVE FUSE F1 FROM ITS HOLDER ON THE PCB

Next: p1605, f1670

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1676, !f1677

INSPECTION CONDENSATE TRAP

Next: p1678, !f1679

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p1680, ?1682, ?1684

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1690, !f1691

VOLTAGE TO AIR MASS SENSOR

Next: p1686, !f1687

RESISTANCE HARNESS AIR MASS SENSOR

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

Next: !p1688, !f1689

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: p1692, !f1693

INSPECTION FLUE

Next: !p1694, !f1695

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p1720, !f1721

INSPECTION CONDENSATE TRAP

Next: p1722, !f1723

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p1724, ?1726, ?1728

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1734, !f1735

VOLTAGE TO AIR MASS SENSOR

Next: p1730, !f1731

RESISTANCE HARNESS AIR MASS SENSOR

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

Next: !p1732, !f1733

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR AND FAN ASSEMBLY

Next: p1736, !f1737

INSPECTION FLUE

Next: !p1738, !f1739

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1303, !f197

INSPECTION CONDENSATE TRAP

Next: p1195, !f254

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p291, f294

INSPECTION DIVERTER VALVE MOTOR OPERATION

REMOVE THE DIVERTER

Next: !p356, f1149

CH OPERATION (NOISY?)

Next: p1232, ?311, ?313

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p292, !f295

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: !p293, !f296

240V OR 24V CONTROLS?

{GAINPCBACS}

Next: p315, f318

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p316, !f317

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p374, ?375, ?377

OBSERVATION CAN COMBUSTION BE ADJUSTED

Next: !p384, f421

VOLTAGE TO AIR MASS SENSOR

Next: p1077, !f1080

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p399, f400

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p403, !f404

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p989, !f406

DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS
BOILER DHW TEMPERATURE SET TO MAX

Next: !p407, f408

240V OR 24V CONTROLS?

{GAINPCBACS}

Next: p414, f415

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p418, !f419

INSPECTION FLOW AND RETURN VALVES

Next: p768, !f468

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p490, !f492

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p450, !f451

INSPECTION INTEGRAL BYPASS

APPLIANCE DRAINED AND DISCHARGED

Next: p462, !f469

DIFFERENTIAL PRIMARY HEAT EXCHANGER FOR CH NOISE

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS
BOILER CH THERMOSTAT SET TO MAX

Next: !p463, ?464, ?466

INSPECTION FLOW AND RETURN VALVES

Next: p518, !f480

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p1403, !f493

RESISTANCE WARM START SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p507, f508

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p511, !f513

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p515, !f514

RESISTANCE WARM START SENSOR

REMOVE THE CONNECTOR FROM THE WARM START SENSOR

Next: !p516, !f517

INSPECTION DIVERTER VALVE MOTOR OPERATION

REMOVE THE DIVERTER

Next: p686, f1156

INSPECTION EXTERNAL BYPASS

Next: p1190, !f531

OBSERVATION CLOSE INTEGRAL BYPASS

CLOSE THE INTEGRAL B

Next: !p692, !f537

VOLTAGE PUMP AT PCB 1

{GAINPCBACS}

Next: p589, !f590

VOLTAGE PUMP AT PCB 2

REMOVE THE CONNECTOR

Next: !p591, !f592

TEMPERATURE APPLIANCE FROST PROTECTION ?

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: p1129, !f1042

FAULT CODES

Next: p1027, !f671

INSPECTION DIVERTER VALVE SPINDLE

Next: p530, !f693

VOLTAGE FROM LOW PRESSURE SENSOR

Next: !p701, f702

RESISTANCE LOW WATER PRESSURE SWITCH HARNESS

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

Next: !p705, !f706

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

OBSERVATION SENSORS CORRECTLY FITTED

Next: p733, !f756

RESISTANCE FLOW SENSOR

REMOVE THE CONNECTOR FROM THE FLOW SENSOR

Next: p734, !f757

RESISTANCE RETURN SENSOR

REMOVE THE CONNECTOR FROM THE RETURN SENSOR

Next: p735, !f758

LIMPET CHECK

Next: p739, !f759

DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS
BOILER DHW TEMPERATURE SET TO MAX

Next: !p740, f741

240V OR 24V CONTROLS?

{GAINPCBACS}

Next: p747, f748

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p753, !f754

INSPECTION EXTERNAL BYPASS

Next: p1179, !f778

INSPECTION EXTERNAL BYPASS

Next: p780, !f782

INSPECTION INTEGRAL BYPASS

APPLIANCE DRAINED AND DISCHARGED

Next: !p781, !f783

RESISTANCE CODING RESISTOR OUTPUT AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1071, f795

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

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: !p854, !f853

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

VOLTAGES AIR MASS SENSOR OPERATION

{GAINPCBACS}
NO DEMANDS

Next: p947, ?948, ?950

OBSERVATION CAN COMBUSTION BE ADJUSTED

Next: !p956, f957

VOLTAGE TO AIR MASS SENSOR

Next: p1082, !f1085

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

LIMPET CHECK

Next: p405, !f1006

Welcome to the XSol Diagnostic System