XSol Diagnostic System

IDEAL LOGIC+ COMBI² C30

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &3700, !f1228

OBSERVATION BOILER STANDBY

Next: &2652, ?3877, ?3884, ?3892, ?3904

OBSERVATION FAN RUN DHW DEMAND

Next: &3929, ?962, ?2482

HOT WATER OPERATION

Next: &1212, ?194, ?196, ?198, ?200, ?202

OBSERVATION BURNER IGNITES AND ESTABLISHES DHW DEMAND

SELECTOR SWITCH IN HOT WATER POSITION

Next: &193, ?289, ?291, ?293

HEATING OPERATION

Next: &958, ?634, ?636, ?638, ?644

OBSERVATION PUMP AND FAN OVER RUN

APPLY A DEMAND FOR HEATING OR HOT WATER

Next: &nff, !f959

FAULT CODES

Next: &nff, !f1086

L 01

OUTSIDE MODEL

Next: &nff, f2175

F 01

OUTSIDE MODEL

Next: &nff, f1137

F 04 / L 04

OUTSIDE MODEL

Next: &nff, f1146

F 05 / L 05

OUTSIDE MODEL

Next: &nff, f1151

OBSERVATION BOILER REACTS TO CH DEMAND

Next: &633, f3798

FURTHER INVESTIGATION FUSES

INTENTIONALLY BLANK - HEADER FOR FUSE INVESTIGATION

Next: &nff, f1714

F 07

OUTSIDE MODEL

Next: &nff, f1451

L 0C

OUTSIDE MODEL

Next: &nff, f1455

F 0A - FLOW RETURN REVERSED - SHOULD ONLY OCCUR IN HEAT ONLY BOILERS

OUTSIDE MODEL

Next: &nff, !f4090

OBSERVATION DHW FLOW RATE

Next: &39, f1501

F 02

OUTSIDE MODEL

Next: &nff, f1962

L 06

OUTSIDE MODEL

Next: &nff, f3560

F 06

OUTSIDE MODEL

Next: &nff, f2266

DU

INTENTIONALLY BLANK - HEADER FOR DU FAULT CODE

Next: &nff, f2270

TYPE OF DIAGNOSTIC PROCEDURE

Next: &1500, !f2653

PCB COMPONENT FOR HYPERLINK

INTENTIONALLY BLANK - HEADER FOR PCB COMPONENT

Next: &nff, !f2659

HEADER FOR QUICK ACCESS DATA RETURN THERMISTOR

OUTSIDE MODEL

Next: &nff, f2782

HEADER FOR QUICK ACCESS DATA FLOW THERMISTOR

OUTSIDE MODEL

Next: &nff, f2786

HEADER FOR QUICK ACCESS DATA GAS VALVE VOLTAGE

OUTSIDE MODEL

Next: &nff, f2790

HEADER FOR QUICK ACCESS DATA GAS VALVE RESISTANCE

OUTSIDE MODEL

Next: &nff, f2794

HEADER FOR QUICK ACCESS DATA PUMP / FAN MAINS VOLTAGE

OUTSIDE MODEL

Next: &nff, f2798

HEADER FOR QUICK ACCESS DATA FAN RESISTANCE

OUTSIDE MODEL

Next: &nff, f2802

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW

Next: &nff, !f2806

DIAGNOSTICS LITE

DIAGNOSIS RELIES ON

Next: &nff, !f2808

HEADER FOR QUICK ACCESS DATA PUMP RESISTANCE

OUTSIDE MODEL

Next: &nff, f2818

HEADER FOR QUICK ACCESS DATA FAN VOLTAGE (LOW VOLTAGE)

OUTSIDE MODEL

Next: &nff, f2822

HEADER FOR QUICK ACCESS DATA PUMP VOLTAGE (LOW VOLTAGE)

OUTSIDE MODEL

Next: &nff, f2831

HEADER FOR QUICK ACCESS DATA DIVERTER VOLTAGE

OUTSIDE MODEL

Next: &nff, f3580

HEADER FOR QUICK ACCESS DATA DIVERTER RESISTANCE

OUTSIDE MODEL

Next: &nff, f3267

HEADER FOR QUICK ACCESS DATA DHW TURBINE VOLTAGE

OUTSIDE MODEL

Next: &nff, f3330

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR VOLTAGE

OUTSIDE MODEL

Next: &nff, f3329

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR RESISTANCE

OUTSIDE MODEL

Next: &nff, f3327

F 0T

OUTSIDE MODEL

Next: &nff, f3339

F 0C DHW THERMISTOR

OUTSIDE MODEL

Next: &nff, f3540

F 10 SPARK GENERATOR FAULT

OUTSIDE MODEL

Next: &nff, f3556

F12 PUMP ROTOR BLOCKED

OUTSIDE MODEL

Next: &nff, f3552

F 13 / F 15 / F 17 PUMP FAULT CHECK PUMP WIRING

OUTSIDE MODEL

Next: &nff, f3555

F 14 HIGH MAINS VOLTAGE

OUTSIDE MODEL

Next: &nff, f3537

F 09 / F 16 GAS VALVE OR INTERNAL FAULT

OUTSIDE MODEL

Next: &nff, f3593

F 0E THERMISTOR FAULT

OUTSIDE MODEL

Next: &nff, f3547

OBSERVATION DISPLAY SET UP

Next: &5, ?3701, ?3719, ?3721

OBSERVATION PUMP RUNS

Next: &284, f3936

INFORMATION FAULT CODE HISTORY

Next: &nff, !f4048

HEADER FOR QUICK ACCESS DATA DHW THERMISTOR

OUTSIDE MODEL

Next: &nff, f4054

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER TO TEMP RADS COOL

KIT - PUMP HEAD

Next: End

DHW NOISEY KETTLING

KIT - CONDENSATE DRAIN

Next: End

CH OPERATION BOILER NOISY

THERMISTER (FLOW)

Next: End

POOR VOLTAGE

Next: End

WONT RESET L5

PCB MAX KIT - V4 LOGIC

Next: End

POOR FLOW RATE

PACK - DHW (ISOLATION VALVE)

Next: End

FLOW RATE

COLD WATER SUPPLY

Next: End

BURNER DOES NOT IGNITE

KIT - CONDENSATE DRAIN

Next: End

VOLTAGE TO GAS VALVE

PCB MAX KIT - V4 LOGIC

Next: End

BURNER DOES NOT IGNITE

INJECTOR

Next: End

BURNER DOES NOT IGNITE

KIT - BURNER

Next: End

BURNER DOES NOT IGNITE

HEAT ENGINE

Next: End

NEW MODELBLOCKED OR DAMAGED

KIT - BURNER

Next: End

SPARKING BUT NO LIGHTING

HEAT ENGINE

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

KIT - CONDENSATE DRAIN

Next: End

BURNER BAFFLES OR NOISY

INJECTOR

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

MECHANICAL PHYSICAL OPERATION

FAN

Next: End

NEW MODEL FLUEWAYS

HEAT ENGINE

Next: End

IGNITES BUT BAFFLES OR NOISY

KIT - BURNER

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

KIT - PUMP HEAD

Next: End

CH OPERATION BOILER NOISY

THERMISTER (RETURN)

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS - MAINS VOLTAGE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

LEAD - IGNITION

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

BURNER IGNITES

ELECTRODE - IGNITION

Next: End

F2 FAULT CODE

GAS PRESSURE INLET

Next: End

F2 FAULT CODE - SENSE

ELECTRODE - IGNITION

Next: End

F2 FAULT CODE

KIT - CONDENSATE DRAIN

Next: End

F2 FAULT CODE

INJECTOR

Next: End

L1 - OVERHEAT FAULT

THERMISTER (FLOW)

Next: End

L1 - OVERHEAT FAULT

THERMISTER (RETURN)

Next: End

F6

HARNESS PELV (LOW VOLTAGE)

Next: End

DU

PCB MAX KIT - V4 LOGIC

Next: End

PUMP RUNS

REGULATOR - FLOW

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

KIT - BURNER

Next: End

F2 FAULT CODE

KIT - BURNER

Next: End

F2 FAULT CODE

HEAT ENGINE

Next: End

FAN RUNS DHW

THERMISTER (FLOW)

Next: End

FAN RUNS DHW

THERMISTER (RETURN)

Next: End

TO FLOW SWITCH - NO HOT WATER DEMAND

HARNESS PELV (LOW VOLTAGE)

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - PUMP HEAD

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

FURTHER INVESTIGATION FUSE F1

SPARK GENERATOR

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

HYPERLINK

PCB MAX KIT - V4 LOGIC

Next: End

OPERATION CH UP TO TEMP RADS COOL

PACK - CH FLOW / RETURN

Next: End

OPERATION CH UP TO TEMP RADS COOL

Next: End

BURNER DOES NOT IGNITE - BAFFLES

GAS PRESSURE INLET

Next: End

OUT OF RANGE (QADAI)

THERMISTER (RETURN)

Next: End

OUT OF RANGE (QADAI)

THERMISTER (FLOW)

Next: End

NO POWER TO GAS VALVE (QADAI)

PCB MAX KIT - V4 LOGIC

Next: End

RESISTANCE INCORRECT (QADAI)

FAN

Next: End

BLANK FOR QUICK ACCESS DATA AND INFORMATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR DIAGNOSICS LITE

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO POWER TO GAS VALVE (QADAI)

HARNESS PELV (LOW VOLTAGE)

Next: End

TO GAS VALVE - NO POWER ON IGN

HARNESS PELV (LOW VOLTAGE)

Next: End

RESISTANCE INCORRECT (QADAI) PUMP

KIT - PUMP HEAD

Next: End

NO FAN AT START UP (QADAI)

PCB MAX KIT - V4 LOGIC

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY (QADAI)

PCB MAX KIT - V4 LOGIC

Next: End

TO FAN POWER - PUMP SHORT TIME START UP (QADAI)

HARNESS - MAINS VOLTAGE

Next: End

F2 FAULT CODE - FLAME SENSE

HARNESS - MAINS VOLTAGE

Next: End

TO LWPS F1 - LOW WATER FAULT

HARNESS PELV (LOW VOLTAGE)

Next: End

F1 - LOW WATER FAULT

SWITCH - PRESSURE - WATER

Next: End

DHW RUNS HOT COLD

INTERNAL BYPASS

Next: End

DHW NOISY KETTLING

INTERNAL BYPASS

Next: End

L1

PACK - CH FLOW / RETURN

Next: End

L1 - OUT OF CALIB

THERMISTER (FLOW)

Next: End

L1 - OUT OF CALIB

THERMISTER (RETURN)

Next: End

RESISTANCE WRONG QADAI

SPARK GENERATOR

Next: End

NO VOLTAGE TO SPARK GENERATOR (QADAI)

PCB MAX KIT - V4 LOGIC

Next: End

QADAI

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

FT

INTERNAL TIMER

Next: End

L1

Next: End

DIVERTER - DHW COOL RADS HOT

HARNESS PELV (LOW VOLTAGE)

Next: End

PREHEAT SATISFACTORY3

DIVERTER VALVE - MINEBEA PADDLE BODY KIT

Next: End

BLOCKED PREHEAT SAT3

KIT - PLATE HEAT EXCHANGER

Next: End

DIVERTER - OPERATION CH UP TO TEMP RADS COOL

HARNESS PELV (LOW VOLTAGE)

Next: End

RADS COLD BOILER HOT

DIVERTER VALVE - MINEBEA PADDLE BODY KIT

Next: End

BOILER HOT RADS COLD

THERMISTER (FLOW)

Next: End

BOILER HOT RADS COLD

THERMISTER (RETURN)

Next: End

DIVERTER - L1

HARNESS PELV (LOW VOLTAGE)

Next: End

L1

DIVERTER VALVE - MINEBEA PADDLE BODY KIT

Next: End

L1 - NO POWER TO PUMP

HARNESS - MAINS VOLTAGE

Next: End

L1 RUNNING SLOW

KIT - PUMP HEAD

Next: End

QADAI DIVERTER RESISTANCE

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

OPERATION DHW - TOO HOT

THERMISTER (DHW)

Next: End

F14

Next: End

F 0E

THERMISTER (FLOW)

Next: End

F 0E

THERMISTER (RETURN)

Next: End

F12

KIT - PUMP HEAD (SEIZED)

Next: End

F10

Z DIRECTION CHOICE OR CONTINUE

Next: End

F13 - LOW VOLTAGE FAULT

PCB MAX KIT - V4 LOGIC

Next: End

F13

HARNESS PELV (LOW VOLTAGE)

Next: End

F13 - MAINS VOLTAGE FAULT

PCB MAX KIT - V4 LOGIC

Next: End

F 10

HARNESS - MAINS VOLTAGE

Next: End

F 09

HARNESS PELV (LOW VOLTAGE)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER IGNITES AND ESTABLISHES - FLAME SENSE

HARNESS - MAINS VOLTAGE

Next: End

RECTIFICATION INSSUE

LEAD - IGNITION

Next: End

RECTIFICATION ISSUE

GAS PRESSURE INLET

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

THERMISTER (FLOW)

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

THERMISTER (RETURN)

Next: End

BURNER DOES NOT IGNITE

THERMISTER (DHW)

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

SPARK BUT NOT LIGHTING

FLUE

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

POWER UP

HARNESS - MAINS VOLTAGE

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE - PCB

Next: End

FAULT CODES 3

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS PRESSURE INLET

Next: End

CALIBRATION LOW BOILER TEMP LOW OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

THERMISTER (FLOW)

Next: End

DHW COOL RADS COOL

THERMISTER (RETURN)

Next: End

DHW COOL RADS COOL

INTERNAL BYPASS

Next: End

BOILER TEMP LOW SYSTEM TEMP LOWOPERATION DHW DHW COOL RADS COOL

GAS PRESSURE INLET

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

INJECTOR

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - CONDENSATE DRAIN

Next: End

MECHANICAL OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

FAN

Next: End

POOR GAS RATE

KIT - BURNER

Next: End

RESTRICTED OPERATION DHW DHW DOOL RADS COLD NO CH DEMAND

HEAT ENGINE

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

FLUE

Next: End

NO CH DEMAND 1

HARNESS TIMER OPTION LINK

Next: End

POWER UP

OPEN TAP OR LEAK

Next: End

POWER UP

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

POWER UP - FIRING NO DEMAND

Next: End

EXTERNAL FROST PROTECT

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

PCB MAX KIT - V4 LOGIC

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

HARNESS PELV (LOW VOLTAGE)

Next: End

FIRES WITH NO DEMAND

FROST PROTECTION (INTERNAL)

Next: End

ON WITH NO DEMAND - FROST

THERMISTER (FLOW)

Next: End

OBSERVATION BOILER STANDBY - HOT BUT NOT ENOUGH TO FAULT

THERMISTER (FLOW)

Next: End

OBSERVATION BOILER STANDBY - ZERO TEMP

THERMISTER (DHW)

Next: End

OBSERVATION BOILER STANDBY - LOW TEMP

THERMISTER (DHW)

Next: End

TO PUMP - NO POWER AT PUMP

HARNESS - MAINS VOLTAGE

Next: End

TO FAN POWER - PUMP SHORT TIME START UP

HARNESS - MAINS VOLTAGE

Next: End

NO FAN AT START UP

PCB MAX KIT - V4 LOGIC

Next: End

OPERATION DHW - DHW COOL RADS COOL

THERMISTER (DHW)

Next: End

DOES NOT RECOGNISE CH DEMAND

HARNESS PELV (LOW VOLTAGE)

Next: End

F2 FAULT CODE

FLUE

Next: End

F 09

NO FAULT - GAS VALVE / INTERNAL PCB FAULT

Next: End

INFORMATION FAULT CODE HISTORY

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

THERMISTER (DHW)

Next: End

F 0C

HARNESS PELV (LOW VOLTAGE)

Next: End

TO RETURN SENSOR F5 - RETURN SENSOR FAULT

HARNESS PELV (LOW VOLTAGE)

Next: End

TO FLOW SENSOR F4 - FLOW SENSOR FAULT

HARNESS PELV (LOW VOLTAGE)

Next: End

OBSERVATION BOILER REACTS TO CH DEMAND - INTERNAL TIMER

HARNESS - MAINS VOLTAGE

Next: End

OBSERVATION BOILER REACTS TO CH DEMAND - NO TIMER

HARNESS - MAINS VOLTAGE

Next: End

DHW OPERATION BOILER NOISY

THERMISTER (FLOW)

Next: End

DHW OPERATION BOILER NOISY

THERMISTER (RETURN)

Next: End

DHW OPERATION BOILER NOISY

KIT - PUMP HEAD

Next: End

DHW COOL RADS COOL

HEAT ENGINE

Next: End

L1

HEAT ENGINE

Next: End

FAULT CODE FA

PCB MAX KIT - V4 LOGIC

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTER (FLOW)

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTER (RETURN)

Next: End

CH TEMP LOW - NO OUTDOOR SENSOR

PCB MAX KIT - V4 LOGIC

Next: End

CH TEMP LOW

OUTDOOR SENSOR

Next: End

LOW GAS RATE CH OPERATION LPG

INJECTOR

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW LPG

THERMISTER (FLOW)

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW LPG

THERMISTER (RETURN)

Next: End

CH TEMP LOW - NO OUTDOOR SENSOR LPG

PCB MAX KIT - V4 LOGIC

Next: End

CH TEMP LOW LPG

OUTDOOR SENSOR

Next: End

L1

INTERNAL BYPASS

Next: End

NO FAN AT START UP

HARNESS PELV (LOW VOLTAGE)

Next: End

FAN DOES NOT RUN

HARNESS - MAINS VOLTAGE

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2

PCB MAX KIT - V4 LOGIC

Next: End

OBSERVATION FAN RUNS DHW DEMAND - SHORTED ON TURBINE

HARNESS PELV (LOW VOLTAGE)

Next: End

RECTIFICATION ISSUE

SPARK GENERATOR

Next: End

FLAME SENSE WIRING

Next: End

L6 FAULT CODE - FLAME SENSE

HARNESS - MAINS VOLTAGE

Next: End

L6 FAULT CODE

ELECTRODE - IGNITION

Next: End

L6 - STICKING OPEN

GAS VALVE KIT

Next: End

L6 FAULT CODE

PCB MAX KIT - V4 LOGIC

Next: End

L6 NO BACKLIGHT

PCB MAX KIT - V4 LOGIC

Next: End

L06 - TO TURBINE

HARNESS PELV (LOW VOLTAGE)

Next: End

UNDER PRESSURE

KIT - EXPANSION VESSEL

Next: End

HOT WATER CYCLING

THERMISTER (FLOW)

Next: End

HOT WATER CYCLING

THERMISTER (RETURN)

Next: End

NO OVERRUNS

PCB MAX KIT - V4 LOGIC

Next: End

HOT WATER TOO HOT

THERMISTER (RETURN)

Next: End

HOT WATER TOO HOT

THERMISTER (FLOW)

Next: End

F4 - FLOW SENSOR FAULT

PCB MAX KIT - V4 LOGIC

Next: End

F5 - RETURN SENSOR FAULT

PCB MAX KIT - V4 LOGIC

Next: End

CH OPERATION NOISEY

Next: End

CH OPERATION NOISY

HEAT ENGINE

Next: End

FALSE LOW VOLTAGE

PCB MAX KIT - V4 LOGIC

Next: End

L5 - RESTART FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

POOR FLOW - RESTRICTED

KIT - PLATE HEAT EXCHANGER

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

SPARK BUT NOT LIGHTING

GAS VALVE KIT

Next: End

SPARKING BUT NOT LIGHTING

ELECTRODE - IGNITION

Next: End

SPARK BUT NOT LIGHTING

ELECTRODE - IGNITION

Next: End

BURNER DOES NOT IGNITE

GAS VALVE KIT

Next: End

IGNITES BUT BAFLLES OR NOISY

GAS VALVE KIT

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB MAX KIT - V4 LOGIC

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

SPARK GENERATOR

Next: End

F6

PCB MAX KIT - V4 LOGIC

Next: End

F6

OUTDOOR SENSOR

Next: End

DU

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS DHW DEMAND - NO FAN

PCB MAX KIT - V4 LOGIC

Next: End

FAN DOES NOT RUN

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

FAN RUNS DHW DEMAND - IGNORING DEMAND

PCB MAX KIT - V4 LOGIC

Next: End

L1 - STUCK IN FAULT

PCB MAX KIT - V4 LOGIC

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE F1

PCB MAX KIT - V4 LOGIC

Next: End

TO SPARK GEN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

NOT OPENING - MECHANICAL

GAS VALVE KIT

Next: End

BURNER DOES NOT IGNITELEAKING POC

KIT - REPLACEMENT - SUMP & COVER

Next: End

BURNER DOES NOT IGNITELEAKING POC

MANIFOLD - FLUE

Next: End

RETURN THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

FLOW THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

FAN SATISFACTORY

RESULT AS EXPECTED

Next: End

RESISTANCE WRONG (QADAI)

GAS VALVE KIT

Next: End

PUMP SATISFACTORY

RESULT AS EXPECTED

Next: End

FAN VOLTAGE OK (LV)

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE (LV)

RESULT AS EXPECTED

Next: End

NO MAINS TO FAN AT START UP (QADAI)

PCB MAX KIT - V4 LOGIC

Next: End

ELECTRICAL OVER 15V ON N (QADAI)

FAN

Next: End

OPERATION DHW DHW COOL RADS COOL

PRESSURE GAUGE

Next: End

OPERATION DHW NOISY

PRESSURE GAUGE

Next: End

OPERATION DHW NOISY

SYSTEM PRESSURE

Next: End

OPERATION DHW DHW COOL RADS COOL

SYSTEM PRESSURE

Next: End

OPERATION DHW RUNS HOT COLD

PRESSURE GAUGE

Next: End

OPERATION DHW RUNS HOT COLD

SYSTEM PRESSURE

Next: End

OPERATION CH UO TEMP RADS COOL

PRESSURE GAUGE

Next: End

OPERATION CH

SYSTEM PRESSURE

Next: End

F1 FAULT CODE

PRESSURE GAUGE

Next: End

F1 - LOW WATER FAULT

SYSTEM PRESSURE

Next: End

F1 - LOW WATER FAULT

PCB MAX KIT - V4 LOGIC

Next: End

F1 - LOW WATER FAULT

SWITCH - PRESSURE - WATER (BLOCKED)

Next: End

L3 NO WATER FLOW

PRESSURE GAUGE

Next: End

FAULT CODE L3

SYSTEM PRESSURE

Next: End

HOT WATER CYCLING

KIT - PLATE HEAT EXCHANGER

Next: End

DHW NOISY KETTLING

KIT - PLATE HEAT EXCHANGER

Next: End

SPARK GENERATOR RESISTANCE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR VOLTAGE

RESULT AS EXPECTED

Next: End

FLOW TURBINE VOLTAGE

RESULT AS EXPECTED

Next: End

FT

PCB MAX KIT - V4 LOGIC

Next: End

BURNER DOES NOT IGNITELEAKING POCBAFFLES

MANIFOLD - FLUE

Next: End

BURNER DOES NOT IGNITELEAKING POCBAFFLES

KIT - REPLACEMENT - SUMP & COVER

Next: End

OPERATION CH NOISY

PRESSURE GAUGE

Next: End

OPERATION CH NOISY

SYSTEM PRESSURE

Next: End

RADS HEAT WITH NO DEMAND - MECHANICAL FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

RADS HEAT WITH NO DEMAND

PCB MAX KIT - V4 LOGIC

Next: End

RADS HEAT WITH NO DEMAND

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

LETBY PREHEAT3

DIVERTER VALVE - MINEBEA PADDLE BODY KIT

Next: End

RADS COLD BOILER HOT - MECHANICAL FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

RADS COLD BOILER HOT

PCB MAX KIT - V4 LOGIC

Next: End

RADS COLD BOILER HOT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

L1 - MECH FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

L1 - VOLTAGE TO DV

PCB MAX KIT - V4 LOGIC

Next: End

L1 - ELEC FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

L1 - NO PUMP

PCB MAX KIT - V4 LOGIC

Next: End

L1 - NOT RUNNING

KIT - PUMP HEAD

Next: End

ALL CHECKS OK RETEST MODEL

NO FAULT - OVERHEAT / L1

Next: End

LEAKING POC

KIT - REPLACEMENT - SUMP & COVER

Next: End

LEAKING POC

MANIFOLD - FLUE

Next: End

DIVERTER RESISTANCE

RESULT AS EXPECTED

Next: End

F14

PCB MAX KIT - V4 LOGIC

Next: End

F 0C

PCB MAX KIT - V4 LOGIC

Next: End

F 0E

PCB MAX KIT - V4 LOGIC

Next: End

F12 - RUNNING BUT NO SIGNAL

KIT - PUMP HEAD

Next: End

F13 - LOW VOLTAGE FAULT

KIT - PUMP HEAD

Next: End

DIVERTER VOLTAGE

RESULT AS EXPECTED

Next: End

QADAI DIVERTER VOLTAGE

PCB MAX KIT - V4 LOGIC

Next: End

QADAI DIVERTER VOLTAGE

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

F13 - MAINS VOLTAGE FAULT

KIT - PUMP HEAD

Next: End

F 10

PCB MAX KIT - V4 LOGIC

Next: End

F 10

SPARK GENERATOR

Next: End

F 09

GAS VALVE KIT

Next: End

RECTIFICATION ISSUE

GAS VALVE KIT

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

PCB MAX KIT - V4 LOGIC

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

OBSERVATION DISPLAY OPERATES

PCB MAX KIT - V4 LOGIC

Next: End

OBSERVATION DISPLAY OPERATES

DIAL ENCODER KIT

Next: End

OBSERVATION DISPLAY OPERATES

KIT - CONTROL BOX FRONT - V4 MAX

Next: End

DHW COOL RADS COOL

KIT - PLATE HEAT EXCHANGER

Next: End

DHW COOL RADS COOL

EXTERNAL HOT WATER FAULT

Next: End

DHW COOL RADS COOL

PCB MAX KIT - V4 LOGIC

Next: End

FAN RUNS CH DEMAND 1

Next: End

NO CH 2

HARNESS PELV (LOW VOLTAGE)

Next: End

NO CH DEMAND

Next: End

POWER UP - FIRING UP WITH NO DHW DEMAND

PCB MAX KIT - V4 LOGIC

Next: End

ON WITH NO DEMAND - FROST

PCB MAX KIT - V4 LOGIC

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

KIT - PUMP HEAD

Next: End

POWER UP - FIRING WITH NO FROST DEMAND

PCB MAX KIT - V4 LOGIC

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCURTEMP

PCB MAX KIT - V4 LOGIC

Next: End

DHW DEMAND STOPS QUICKLY

KIT - PUMP HEAD

Next: End

NO MAINS TO FAN AT START UP

PCB MAX KIT - V4 LOGIC

Next: End

ELECTRICAL OVER 15V ON N

FAN

Next: End

NO CH DEMAND 1 NEW

INTERNAL TIMER

Next: End

F2 FAULT CODE

PCB MAX KIT - V4 LOGIC

Next: End

F 09

PCB MAX KIT - V4 LOGIC

Next: End

DHW THERMISTOR

RESULT AS EXPECTED

Next: End

F 0C

THERMISTER (DHW)

Next: End

F5 - RETURN SENSOR FAULT

THERMISTER (RETURN)

Next: End

F4 - FLOW SENSOR FAULT

THERMISTER (FLOW)

Next: End

NOT RESPONDING TO CH 1 NEW

PCB MAX KIT - V4 LOGIC

Next: End

NOT RESPONDING TO HEATING 2

PCB MAX KIT - V4 LOGIC

Next: End

DHW NOISY KETTLING

HEAT ENGINE

Next: End

L1 - TRIPPING EARLY

PCB MAX KIT - V4 LOGIC

Next: End

LOW GAS RATE CH OPERATION

INJECTOR

Next: End

LOW SYSTEM TEMP POT

PCB MAX KIT - V4 LOGIC

Next: End

LOW SYSTEM TEMP POT LPG

PCB MAX KIT - V4 LOGIC

Next: End

L1

KIT - PLATE HEAT EXCHANGER

Next: End

NO FAN AT START UP

FAN

Next: End

OBSERVATION FAN RUNS DHW DEMAND - SHORTED CAUSING NO DEMAND

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB MAX KIT - V4 LOGIC

Next: End

BLANK FOR L6 FAULT CODE RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

L 06

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

DHW TOO HOT

PCB MAX KIT - V4 LOGIC

Next: End

EXPANSION CONNECTION

KIT - PIPE - EXPANSION VESSEL

Next: End

MIXING - HOT WATER CYCLING

EXTERNAL HOT WATER FAULT

Next: End

DIFFERENTIAL OK

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p1325

TEMP DIFF CORRECT LOCAL BOILING

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p1327

INLET PRESSURE DOES NOT CHANGE

CHARACTERISTIC TEST FROM PRESSURE GAS INLET (BLIP TEST)

Next: p1561

INLET PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET (BLIP TEST)

Next: !p1563

SPARK ELECTRODE IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1583

SPARK GAP INCORRECT

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1585

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p3465

DHW COOL RADS COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2873

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p3467

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2924

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2962

00 ON LEFT HAND SIDE DOES NOT CHANGE AND NEITHER THE FAN NOR THE PUMP RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUN DHW DEMAND

Next: p2492

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p2765

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p2767

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN / PUMP AT PCB

Next: !p2838

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN / PUMP AT PCB

Next: p2844

BURNER DOES NOT IGNITE - IGNITION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1763

BURNER IGNITES BUT DOES NOT ESTABLISH - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p3615

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2921

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1678

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2961

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2957

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2960

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2977

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2979

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2982

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2984

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2988

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p2990

SYSTEM PRESSURE OK BUT GAUGE DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3034

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3036

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3420

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3422

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3437

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3439

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3472

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3474

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3486

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3488

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3502

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3504

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3526

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3528

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3583

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3585

DISPLAY BLANK / DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY SET UP

Next: p3702

NO FAULT CODE BUT UNABLE TO ADJUST TEMPERATURES OR TURN HOT WATER & HEATING ON

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY SET UP

Next: p3720

FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY SET UP

Next: p3722

EITHER CONTROL KNOB DAMAGED / NOT WORKING

CHARACTERISTIC TEST FROM INSPECTION CONTROL KNOBS & BUTTONS

Next: !p3730

ONE OR MORE BUTTONS DAMAGED / NOT WORKING

CHARACTERISTIC TEST FROM INSPECTION CONTROL KNOBS & BUTTONS

Next: !p3731

DHW DEMAND SHOWING (00 ON LEFT HAND SIDE CHANGES TO HOT WATER TEMPERATURE)

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p3879

CH DEMAND SHOWING (00 ON RIGHT HAND SIDE CHANGES TO FLOW TEMPERATURE)

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p3887

NO DEMAND SHOWING BUT PUMP RUNNING CONSTANTLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p3910

DISPLAY ALTERNATING FP (FROST PROTECTION) AND FLOW TEMPERATURE

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p3905

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN / PUMP AT PCB

Next: !p3950

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN / PUMP AT PCB

Next: p3952

DIFF OK BUT GOES TO LOCKOUT BEFORE REACHING REASONABLE TEMP

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (OVERHEAT)

Next: !p4088

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (OVERHEAT)

Next: p4083

GAS RATE LOW

CHARACTERISTIC TEST FROM GAS RATE

Next: !p4094

UNABLE TO GAS RATE (E G LPG)

CHARACTERISTIC TEST FROM GAS RATE

Next: p4096

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3423

BOILER REACHES TEMPERATURE BUT SYSTEM DOES NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2698

BOILER TEMPERATURE AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3732

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p645

00 ON LEFT HAND SIDE CHANGES TO HOT WATER TEMPERATURE BUT FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUN DHW DEMAND

Next: p3941

10/11/2023 09:26:07 2311_1_46_1 29/11/2023 12:31:12

20/11/2023 11:07:23

Next: End

POWER OK PCB DEAD

PCB MAX KIT - V4 LOGIC

Next: End

INSPECTION SYSTEM PRESSURE AND RISE

Next: p2992, ?2987, ?2989

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p1150, f1147

RESISTANCE HARNESS SENSOR TEMP FLOW

REMOVE CONNECTOR FROM FLOW THERMISTOR

Next: !p4061, !f4062

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p1155, f1152

RESISTANCE HARNESS SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN THERMISTOR

Next: !p4059, !f4060

VOLTAGE MAINS POWER SUPPLY AT TERMINAL BLOCK (LOW VOLTAGE)

GAIN ACCESS TO INCOMING MAINS TERMINAL BLOCK (USE INSULATION MAT AS NECESSARY)

Next: !p1452, !f1453

POWER OFF RESET BOILER

WAIT APPROXIMATELY 15 SECONDS

Next: !p1457, !f1456

INSPECTION DHW ISOLATION VALVE

Next: p1502, !f1503

RESISTANCE FAN / PUMP AND HARNESS

REMOVE CONNECTOR X1 FROM THE PCB

Next: p2548, f2514

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1801, f3657

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1963, !f1964

OBSERVATION RESET BOILER - OVERHEAT

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p2176, f2177

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p2178, !f2179

RESISTANCE OUTDOOR SENSOR AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X8 FROM PCB

Next: !p2271, f2272

INFORMATION SERVICE MODE

NOT USED IN THIS MODEL

Next: !p2277, !f2278

RESISTANCE HARNESS OUTDOOR SENSOR

DISCONNECT X8 FROM THE PCB

Next: !p2273, !f2274

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2494, f4158

RESISTANCE PUMP

UNPLUG THE MAINS HARNESS (LEFT HAND SIDE) FROM THE PUMP

Next: p2545, !f2516

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2551, !f2552

RESISTANCE HARNESS GAS VALVE

REMOVE CONNECTOR FROM GAS VALVE

Next: !p2575, !f2812

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2783, !f2784

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2787, !f2788

VOLTAGE GAS VALVE AT PCB

Next: !p2791, !f2792

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: !p2795, f2809

VOLTAGE FAN / PUMP AT PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p2799, ?2837, ?2843

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2803, !f2804

RESISTANCE HARNESS GAS VALVE

REMOVE CONNECTOR FROM GAS VALVE

Next: !p2810, !f2811

RESISTANCE PUMP

UNPLUG THE MAINS HARNESS (LEFT HAND SIDE) FROM THE PUMP

Next: !p2819, !f2820

VOLTAGE FAN CONTROL (AT PCB)

REMOVE DC ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: !p2829, !f2824

VOLTAGE PUMP SPEED CONTROL

DISCONNECT PUMP SPEE

Next: !p2836, !f2833

RESISTANCE LOW WATER PRESSURE SWITCH

DISCONNECT WIRES FROM LOW WATER PRESSURE SWITCH

Next: p2995, !f2996

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT X4 FROM THE PCB

Next: !p3535, !f3534

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p3331, !f3332

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p3333, !f3334

VOLTAGE FROM HOT WATER FLOW TURBINE

SET FLOW RATE TO 3 LITRES/MIN

Next: !p3337, !f3336

OBSERVATION DISCONNECT INTERNAL TIMER

REMOVE AND DISCONNEC

Next: !p3340, !f3341

VOLTAGE DIVERTER VALVE

Next: !p3470, ?3471, ?3473

VOLTAGE DIVERTER VALVE

Next: !p3484, ?3485, ?3487

VOLTAGE DIVERTER VALVE

Next: !p3500, ?3501, ?3503

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3511, f3512

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOLTAGE PLUG FROM PUMP THEN
REMOVE CLIP TO EXPOSE CONNECTIONS

Next: !p3513, !f3514

VOLTAGE MAINS POWER SUPPLY AT TERMINAL BLOCK (HIGH VOLTAGE)

GAIN ACCESS TO INCOMING MAINS TERMINAL BLOCK (USE INSULATION MAT AS NECESSARY)

Next: !p3538, !f3539

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p3541, f3542

RESISTANCE HARNESS SENSOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p4057, !f4058

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3548, !f3549

OBSERVATION IS PUMP SPINNING

PLACE SCREWDRIVER INTO PUMP TEST POINT, PUSHING IN SLIGHTLY TO HOLD IT IN THE TEST POSITION

Next: !p3553, !f3554

OBSERVATION IS PUMP LED ON

Next: p3575, f3586

OBSERVATION IS SPARK GENERATOR FAULT CURRENTLY SHOWING

Next: p3559, !f3558

OBSERVATION SPARK GENERATOR CONNECTIONS

Next: p4178, !f4172

VOLTAGE DIVERTER VALVE

Next: !p3581, ?3582, ?3584

VOLTAGE PUMP AT PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p3587, !f3588

INSPECTION HARNESS SPARK GENERATOR

{GAINPCBACS}

Next: !p3591, !f3592

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p3594, f3595

RESISTANCE HARNESS GAS VALVE

REMOVE CONNECTOR FROM GAS VALVE

Next: !p3596, !f3597

RESISTANCE HARNESS FLAME SENSE

DISCONNECT X2 FROM THE PCB

Next: !p4170, !f3635

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3662, !f3659

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p3705, f3706

3AMP FUSE FAULTY

Next: !p3707, !f3708

PCB FUSE FAULTY

Next: !p3713, !f3714

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

ATTACH TEMPERATURE C

Next: p3753, !f4078

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p3786, !f3787

OBSERVATION INTERNAL TIMER

Next: p3799, f3800

OBSERVATION BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3801, f3802

RESISTANCE BYPASSED EXTERNAL CONTROLS AND HARNESS

DISCONNECT PLUG X8 FROM PCB
ENSURE LINK ON OPENTHERM TERMINALS IS STILL FITTED

Next: p4067, f3804

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p3805, !f3806

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3937, f3938

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOLTAGE PLUG FROM PUMP THEN
REMOVE CLIP TO EXPOSE CONNECTIONS

Next: !p3939, !f3940

VOLTAGE FAN (AT PCB) - MAINS

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p4129, ?3949, ?3951

OBSERVATION BYPASS INTERNAL TIMER

DISCONNECT THE TIMER

Next: !p4014, f4015

RESISTANCE HARNESS INTERNAL TIMER

DISCONNECT PLUG X8 FROM PCB
ALL LINKS FROM PREVIOUS TESTS STILL FITTED

Next: p4064, !f4017

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p4055, !f4056

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4071, !f4072

VOLTAGE TO FLOW SWITCH TURBINE WITH X6 DISCONNECTED

DISCONNECT X6 AT THE PCB

Next: p4159, !f4160

INSPECTION INTERNAL BYPASS

DRAIN BOILER PRIMARY CIRCUIT
TWIST AND LIFT / PRISE OUT INTERNAL BYPASS

Next: !p3078, !f3079

CHECK FOR NOISE ON HEATING DEMAND

ENSURE HEATING FLOW AND RETURN VALVES ARE FULLY OPEN

Next: p1303, f4070

INSPECTION CONDENSATE

Next: p3082, !f1320

HEATING FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES AS CLOSE TO THE BOILER AS POSSIBLE

Next: p1323, ?1324, ?1326

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p1328, !f1329

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p1759, !f1762

OBSERVATION COLD WATER SUPPLY

Next: p1504, !f1505

INSPECTION REGULATOR / FILTER DHW INLET

ISOLATE AND DRAIN THE MAINS WATER SUPPLY
REMOVE REGULATOR / FILTER FROM CARTRIDGE ASSEMBLY

Next: !p1506, !f2453

INSPECTION CONDENSATE

Next: p1556, !f1557

PRESSURE GAS INLET (BLIP TEST)

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3680, ?1560, ?1562

INSPECTION BURNER

REMOVE THE BURNER

Next: p1578, !f1579

VOLTAGE GAS VALVE AT PCB

Next: p1564, !f1565

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p3667, f2574

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1570, !f1571

INSPECTION BURNER

REMOVE THE BURNER

Next: p1572, !f1573

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: !p1574, !f1575

INSPECTION ELECTRODE SPARK GAP

CAREFULLY REMOVE BURNER FROM BOILER

Next: p1580, ?1582, ?1584

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: !p1586, !f1587

INSPECTION CONDENSATE

Next: p2768, !f1680

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1683, !f1684

INSPECTION FLUE

Next: p1685, !f1686

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p3413, !f1688

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1689, !f1690

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1691, !f1692

PUMP LIMPET TEST

Next: !p1760, !f1761

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD FROM THE SPARK ELECTRODE AND
WEDGE IT AGAINST THE CASING / ELECTRODE AS SHOWN

Next: p1555, f1800

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE CONNECTOR FROM SPARK GENERATOR

Next: p1803, !f1804

RESISTANCE IGNITION / RECTIFICATION LEAD

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p1805, !f1806

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3600, !f1843

RESISTANCE IGNITION / RECTIFICATION LEAD

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: p4163, !f3641

INSPECTION ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2454, !f1847

RESISTANCE HARNESS FLAME SENSE

DISCONNECT X2 FROM THE PCB

Next: p1965, !f2850

INSPECTION ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p1967, !f1968

INSPECTION CONDENSATE

Next: p4028, !f1970

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p2468, !f1972

INSPECTION SYSTEM PRESSURE AND RISE

Next: p3038, ?3033, ?3035

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2504, !f2181

INSPECTION BURNER

REMOVE THE BURNER

Next: !p3642, !f2456

INSPECTION BURNER

REMOVE THE BURNER

Next: p2469, !f2470

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: !p4043, !f2472

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p2488, !f2489

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2490, !f2491

VOLTAGE FROM HOT WATER FLOW TURBINE

SET FLOW RATE TO 3 LITRES/MIN

Next: !p2498, f2493

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR FROM THE DHW FLOW TURBINE

Next: !p2496, !f2497

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2546, !f2547

RESISTANCE HARNESS AND SPARK GENERATOR

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p2549, f2550

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2722, !f2721

INSPECTION SYSTEM PRESSURE AND RISE

Next: p742, ?2981, ?2983

INSPECTION EXTERNAL BYPASS

Next: p3481, !f2741

INSPECTION SUMP AND FLUE MANIFOLD

REMOVE SUMP INSPECTION COVER

Next: p1558, ?2764, ?2766

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1679, !f2780

RESISTANCE HARNESS FAN POWER

DISCONNECT MAINS VOLTAGE PLUG FROM FAN

Next: !p2845, !f2846

INSPECTION SYSTEM PRESSURE AND RISE

Next: p3961, ?2920, ?2953

INSPECTION SYSTEM PRESSURE AND RISE

Next: p1302, ?2955, ?2958

INSPECTION SYSTEM PRESSURE AND RISE

Next: p770, ?2976, ?2978

RESISTANCE LOW WATER PRESSURE SWITCH AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X6 FROM PCB

Next: !p2993, f2994

INSPECT LOW WATER PRESSURE SENSOR (BLOCKAGE)

ISOLATE BOILER FROM THE HEATING CIRCUIT AND DRAIN BOILER
REMOVE LOW WATER PRESSURE SENSOR

Next: !p2997, !f2998

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p3342, !f3197

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3041, !f3198

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3497, !f3199

INSPECTION INTERNAL BYPASS

DRAIN BOILER PRIMARY CIRCUIT
TWIST AND LIFT / PRISE OUT INTERNAL BYPASS

Next: !p3083, !f3084

INSPECTION EXTERNAL BYPASS

Next: p3039, !f3412

INSPECTION SUMP AND FLUE MANIFOLD

REMOVE SUMP INSPECTION COVER

Next: p1687, ?3419, ?3421

INSPECTION SYSTEM PRESSURE AND RISE

Next: p1322, ?3436, ?3438

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p571, !f3536

INSPECTION DIVERTER VALVE HEAD DHW POSITION

UNCLIP DIVERTER VALV

Next: p3468, f3469

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DI

Next: p3477, !f3478

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR

Next: !p3475, !f3476

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p3479, !f3480

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

UNCLIP DIVERTER VALV

Next: p3482, f3483

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DI

Next: p3491, !f3492

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR

Next: !p3489, !f3490

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3493, !f3494

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p3495, !f3496

INSPECTION DIVERTER VALVE HEAD OPERATION

UNCLIP DIVERTER VALV

Next: p3498, f3499

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DI

Next: p3507, !f3508

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR

Next: !p3505, !f3506

OBSERVATION PUMP RUNS

Next: p3509, f3510

PUMP LIMPET TEST

Next: p3515, !f3516

TEMPERATURE DIFFERENTIAL FLOW RETURN (OVERHEAT)

ATTACH TEMPERATURE C

Next: p3517, ?4079, ?4081

INSPECTION SUMP AND FLUE MANIFOLD

REMOVE SUMP INSPECTION COVER

Next: !p3523, ?3525, ?3527

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p3550, !f3551

OBSERVATION DISCONNECT SPARK GENERATOR AND HARNESS

DISCONNECT X2 FROM THE PCB AND MAKE SAFE

Next: !p3589, f3590

VOLTAGE PUMP SPEED CONTROL

DISCONNECT PUMP SPEE

Next: p3576, !f3577

RESISTANCE HARNESS PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL

Next: !p3578, !f3579

OBSERVATION DOES FAULT REOCCUR

Next: !p4044, !f4046

INSPECTION FLUE

Next: p1842, !f3614

VOLTAGE RECTIFICATION CIRCUIT

Next: p3643, f3633

INSPECTION CONDENSATE

Next: p1841, !f3655

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p3660, !f3661

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3658, !f3666

INSPECTION FLUE

Next: p1568, !f3677

INSPECTION FLUE

Next: p2749, !f3699

VOLTAGE MAINS POWER SUPPLY AT TERMINAL BLOCK

GAIN ACCESS TO INCOMING MAINS TERMINAL BLOCK (USE INSULATION MAT AS NECESSARY)

Next: p3703, f3704

VOLTAGE MAINS POWER SUPPLY AT PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p3709, !f3710

RESISTANCE FUSE F2 (APPLIANCE)

Next: p4188, f3712

INSPECTION CONTROL KNOBS & BUTTONS

{GAINPCBACS}
REMOVE PCB FROM ITS HOUSING

Next: !p3725, ?3726, ?3728

FAULT CODES

Next: !p3723, !f3724

GAS INLET PRESSURE

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3733, !f3734

GAS RATE

Next: p4107, ?4093, ?4095

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3747, !f3748

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3749, !f3750

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE C

Next: p3751, f3752

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3782, !f3783

INSPECTION INTERNAL BYPASS

DRAIN BOILER PRIMARY CIRCUIT
TWIST AND LIFT / PRISE OUT INTERNAL BYPASS

Next: !p3780, !f3781

OBSERVATION ISOLATE DHW

TURN THE DHW ISOLATION VALVE OFF

Next: !p3784, f3785

INSPECTION CONDENSATE

Next: p3788, !f3789

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p3790, !f3791

INSPECTION BURNER

REMOVE THE BURNER

Next: p3792, !f3793

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p3794, !f3795

INSPECTION FLUE

Next: !p3796, !f3797

OBSERVATION BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3807, f4013

OBSERVATION ISOLATE DHW

TURN THE DHW ISOLATION VALVE OFF

Next: p3917, !f3881

OBSERVATION DISCONNECT FLOW TURBINE

UNPLUG ELECTRICAL CONNECTOR AT FLOW TURBINE AND MAKE SAFE

Next: !p3882, !f3883

VOLTAGE EXTERNAL CONTROLS (NO DEMAND)

GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: p3888, !f3889

VOLTAGE EXTERNAL FROST STAT

GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: !p3890, !f3891

VOLTAGE PUMP SPEED CONTROL

DISCONNECT PUMP SPEE

Next: p3894, !f3895

RESISTANCE HARNESS PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL

Next: !p3896, !f3897

OBSERVATION AMBIENT TEMPERATURE

Next: p3906, !f3907

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p3908, !f3909

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3921, !f3916

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3880, !f3928

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3893, !f3927

OBSERVATION DISCONNECT FLOW SENSOR

DISCONNECT FLOW THERMISTOR AND MAKE SAFE

Next: p2487, f3947

VOLTAGE FAN CONTROL (AT PCB)

REMOVE DC ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p4139, !f3956

RESISTANCE HARNESS FAN POWER

DISCONNECT MAINS VOLTAGE PLUG FROM FAN

Next: !p3953, !f3954

RESISTANCE SENSOR TEMP DHW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3746, !f4012

INSPECTION FLUE

Next: p1969, !f4040

RESISTANCE HARNESS MAINS EXTERNAL CONTROLS

DISCONNECT X1 AND X2 FROM THE PCB

Next: !p4065, !f4066

RESISTANCE HARNESS MAINS EXTERNAL CONTROLS

DISCONNECT X1 AND X2 FROM THE PCB

Next: !p4068, !f4069

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4073, !f4074

PUMP LIMPET TEST

Next: !p4075, !f4076

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

ATTACH TEMPERATURE C

Next: p4084, !f4085

INSPECTION INTERNAL BYPASS

DRAIN BOILER PRIMARY CIRCUIT
TWIST AND LIFT / PRISE OUT INTERNAL BYPASS

Next: !p4127, !f4128

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p4118, !f4117

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4108, !f4109

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4110, !f4111

OBSERVATION IS WEATHER COMPENSATION FITTED

Next: p4112, !f4113

RESISTANCE OUTDOOR SENSOR AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X8 FROM PCB

Next: !p4114, !f4115

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4119, !f4120

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p4121, !f4122

OBSERVATION IS WEATHER COMPENSATION FITTED

Next: p4123, !f4124

RESISTANCE OUTDOOR SENSOR AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X8 FROM PCB

Next: !p4125, !f4126

RESISTANCE HARNESS FAN CONTROL

REMOVE LOW VOLTAGE CONNECTOR FROM FAN

Next: p3948, !f4137

RESISTANCE HARNESS FAN POWER

DISCONNECT MAINS VOLTAGE PLUG FROM FAN

Next: !p4140, !f4141

VOLTAGE TO FLOW SWITCH TURBINE WITH FLOW SWITCH DISCONNECTED

RECONNECT X6 AT THE

Next: !p4161, !f4162

RESISTANCE SPARK GENERATOR RECTIFICATION

REMOVE THE IGNITION LEAD FROM THE SPARK GENERATOR
REMOVE THE WHITE/BLACK WIRE FROM CONNECTOR 5

Next: p1844, !f4169

RESISTANCE HARNESS FLAME SENSE

DISCONNECT X2 FROM THE PCB

Next: p4179, !f4180

INSPECTION ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p4181, !f4182

TIGHTNESS TEST INSTALLATION

Next: p4183, !f4184

OBSERVATION FAULT CODE RESET (FALSE FLAME)

Next: !p4185, !f4186

OBSERVATION DISCONNECT X6

DISCONNECT X6 FROM THE PCB

Next: p4189, !f4190

OBSERVATION DISCONNECT FLOW TURBINE (NO DISPLAY)

RECONNECT X6 AT THE

Next: !p4191, !f4192

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p838, !f998

PRESSURE EXPANSION VESSEL

SYSTEM PRESSURE DISCHARGED

Next: !p646, !f647

PUMP LIMPET TEST

Next: p2679, !f1262

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE C

Next: p771, f776

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p772, !f779

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p994, !f783

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p572, !f997

Welcome to the XSol Diagnostic System