XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

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

UP

OUTSIDE MODEL

Next: &nff, f2264

F 06

OUTSIDE MODEL

Next: &nff, f2266

F 0U F0J - FJ SKIPS FIRST TEST - UNSURE IF FJ HAPPENS BUT CANT HURT

OUTSIDE MODEL

Next: &nff, f2268

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

INFORMATION BOILER PREHEAT

Next: &nff, !f4051

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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

UP

PCB - V4 LOGIC - STD KIT

Next: End

DU

PCB - V4 LOGIC - STD KIT

Next: End

FU - SHOWING FAULT

THERMISTER (RETURN)

Next: End

FU - SHOWING FAULT

THERMISTER (FLOW)

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY (QADAI)

PCB - V4 LOGIC - STD KIT

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

FU - BOILER RESET

THERMISTER (FLOW)

Next: End

FU - BOILER RESET

THERMISTER (RETURN)

Next: End

FU / FJ TO PUMP - NO POWER AT PUMP

HARNESS - MAINS VOLTAGE

Next: End

FUFO-L3 - NO FLOW FAULT - STICKING

KIT - PUMP HEAD

Next: End

FU

PACK - CH FLOW / RETURN

Next: End

FU

Next: End

FUFAULT CODE L3

HEAT ENGINE

Next: End

FU

Next: End

DHW RUNS HOT COLD

INTERNAL BYPASS

Next: End

FU

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 - V4 LOGIC - STD KIT

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

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 - V4 LOGIC - STD KIT

Next: End

F13 - LOW VOLTAGE FAULT

PCB - V4 LOGIC - STD KIT

Next: End

F13

HARNESS PELV (LOW VOLTAGE)

Next: End

F13 - MAINS VOLTAGE FAULT

PCB - V4 LOGIC - STD KIT

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

EXTERNAL FROST PROTECT

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 FAULT

Next: End

INFORMATION FAULT CODE HISTORY

Z DIRECTION CHOICE OR CONTINUE

Next: End

INFORMATION BOILER PREHEAT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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

FLAME SENSE WIRING

FLAME SENSE WIRING

Next: End

L6 NO BACKLIGHT

PCB - V4 LOGIC - STD KIT

Next: End

L06 - TO TURBINE

HARNESS PELV (LOW VOLTAGE)

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2

PCB - V4 LOGIC - STD KIT

Next: End

OBSERVATION FAN RUNS DHW DEMAND - SHORTED ON 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 - V4 LOGIC - STD KIT

Next: End

HOT WATER TOO HOT

THERMISTER (RETURN)

Next: End

HOT WATER TOO HOT

THERMISTER (FLOW)

Next: End

F4 - FLOW SENSOR FAULT

PCB - V4 LOGIC - STD KIT

Next: End

F5 - RETURN SENSOR FAULT

PCB - V4 LOGIC - STD KIT

Next: End

CH OPERATION NOISEY

Next: End

CH OPERATION NOISY

HEAT ENGINE

Next: End

FALSE LOW VOLTAGE

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

SPARK GENERATOR

Next: End

F6

PCB - V4 LOGIC - STD KIT

Next: End

F6

OUTDOOR SENSOR

Next: End

UP

PCB INITIAL SETUP

Next: End

DU

Z DIRECTION CHOICE OR CONTINUE

Next: End

FU

PCB - V4 LOGIC - STD KIT

Next: End

FAN RUNS DHW DEMAND - NO FAN

PCB - V4 LOGIC - STD KIT

Next: End

FAN DOES NOT RUN

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

FAN RUNS DHW DEMAND - IGNORING DEMAND

PCB - V4 LOGIC - STD KIT

Next: End

L1 - STUCK IN FAULT

PCB - V4 LOGIC - STD KIT

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE F1

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

F1 - LOW WATER FAULT

SWITCH - PRESSURE - WATER (BLOCKED)

Next: End

FU

PRESSURE GAUGE

Next: End

FU

SYSTEM PRESSURE

Next: End

FU / FJ PUMP

PCB - V4 LOGIC - STD KIT

Next: End

FU / FJ - NOT RUNNING

KIT - PUMP HEAD

Next: End

FU

NO FAULT - FU / FJ

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

FUFAULT CODE L3

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

L1 - ELEC FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

L1 - NO PUMP

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

F 0C

PCB - V4 LOGIC - STD KIT

Next: End

F 0E

PCB - V4 LOGIC - STD KIT

Next: End

F12 - RUNNING BUT NO SIGNAL

KIT - PUMP HEAD

Next: End

BLANK FOR L6 FAULT CODE RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

F13 - LOW VOLTAGE FAULT

KIT - PUMP HEAD

Next: End

DIVERTER VOLTAGE

RESULT AS EXPECTED

Next: End

QADAI DIVERTER VOLTAGE

PCB - V4 LOGIC - STD KIT

Next: End

QADAI DIVERTER VOLTAGE

DIVERTOR VALVE - MOTOR KIT MINEBEA

Next: End

F13 - MAINS VOLTAGE FAULT

KIT - PUMP HEAD

Next: End

F 10

PCB - V4 LOGIC - STD KIT

Next: End

F 10

SPARK GENERATOR

Next: End

F 09

GAS VALVE KIT

Next: End

RECTIFICATION ISSUE

SPARK GENERATOR

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB - V4 LOGIC - STD KIT

Next: End

RECTIFICATION ISSUE

GAS VALVE KIT

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

PCB - V4 LOGIC - STD KIT

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

POWER OK PCB DEAD

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

OBSERVATION DISPLAY OPERATES

DIAL ENCODER KIT

Next: End

OBSERVATION DISPLAY OPERATES

KIT - CONTROL BOX FRONT

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 - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

ON WITH NO DEMAND - FROST

PCB - V4 LOGIC - STD KIT

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

KIT - PUMP HEAD

Next: End

POWER UP - FIRING WITH NO FROST DEMAND

PCB - V4 LOGIC - STD KIT

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCURTEMP

PCB - V4 LOGIC - STD KIT

Next: End

DHW DEMAND STOPS QUICKLY

KIT - PUMP HEAD

Next: End

NO MAINS TO FAN AT START UP

PCB - V4 LOGIC - STD KIT

Next: End

ELECTRICAL OVER 15V ON N

FAN

Next: End

NO CH DEMAND 1 NEW

INTERNAL TIMER

Next: End

F2 FAULT CODE

PCB - V4 LOGIC - STD KIT

Next: End

F 09

PCB - V4 LOGIC - STD KIT

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 - V4 LOGIC - STD KIT

Next: End

NOT RESPONDING TO HEATING 2

PCB - V4 LOGIC - STD KIT

Next: End

DHW NOISY KETTLING

HEAT ENGINE

Next: End

L1 - TRIPPING EARLY

PCB - V4 LOGIC - STD KIT

Next: End

LOW GAS RATE CH OPERATION

INJECTOR

Next: End

LOW SYSTEM TEMP POT

PCB - V4 LOGIC - STD KIT

Next: End

LOW SYSTEM TEMP POT LPG

PCB - V4 LOGIC - STD KIT

Next: End

L1

KIT - PLATE HEAT EXCHANGER

Next: End

NO FAN AT START UP

FAN

Next: End

L 06

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

OBSERVATION FAN RUNS DHW DEMAND - SHORTED CAUSING NO DEMAND

FLOW SENSOR (SUZUKI) - C/W IMPELLER KIT

Next: End

DHW TOO HOT

PCB - V4 LOGIC - STD KIT

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

Next: !p2765

FLUE MANIFOLD UNSATISFACTORY

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: !p3002

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3004

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

Next: !p3420

SUMP UNSATISFACTORY

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

Next: !p3526

FLUE MANIFOLD UNSATISFACTORY

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 SELECTOR SWITCH DAMAGED / NOT WORKING

CHARACTERISTIC TEST FROM INSPECTION CONTROL KNOBS & BUTTONS

Next: !p3730

EITHER BUTTON 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

DIFFERENTIAL OK BUT GOES TO LOCKOUT BEFORE REACHING REASONABLE TEMPERATURE

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

Next: !p4094

UNABLE TO GAS RATE (E G LPG)

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

22/06/2023 08:09:18 2301_1_46_1 29/11/2023 12:32:05

12/07/2023 06:42:09

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

INFORMATION PCB SETUP

Next: !p2275, !f2276

RESISTANCE OUTDOOR SENSOR AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X8 FROM PCB

Next: !p2271, f2272

OBSERVATION IS BOILER SHOWING F 0U

ENSURE BOILER IS COOL

Next: p2285, f2280

INFORMATION SERVICE MODE

Next: !p2277, !f2278

RESISTANCE HARNESS OUTDOOR SENSOR

DISCONNECT X8 FROM THE PCB

Next: !p2273, !f2274

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p2281, !f2282

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

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3013, f3014

RESISTANCE HARNESS PUMP

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

Next: !p3015, !f3016

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

ATTACH TEMPERATURE C

Next: p3025, !f3026

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 F10 CURRENTLY SHOWING

Next: p3559, !f3558

OBSERVATION IS BACKLIGHT ILLUMINATED

Next: p4142, f4153

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

VOLTAGE RECTIFICATION CIRCUIT

MOVE WIRE BACK TO CONNECTION 5 IF YOU HAVE NOT ALREADY DONE SO

Next: !p3634, f3635

RESISTANCE HARNESS FLAME SENSE

DISCONNECT X2 FROM THE PCB

Next: !p3636, !f3637

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

OBSERVATION DISCONNECT X6

DISCONNECT X6 FROM THE PCB

Next: p4154, !f4155

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: p1844, !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

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2283, !f2284

INSPECTION SYSTEM PRESSURE AND RISE

Next: p3006, ?3001, ?3003

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

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3007, !f3008

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p3009, !f3010

OBSERVATION PUMP RUNS

Next: p3011, f3012

PUMP LIMPET TEST

Next: p3017, !f3018

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p3019, !f3020

INSPECTION EXTERNAL BYPASS

Next: p3021, !f3022

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE C

Next: p3023, f3024

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

ATTACH TEMPERATURE C

Next: !p3029, !f3030

INSPECTION INTERNAL BYPASS

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

Next: !p3080, !f3081

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

RESISTANCE HARNESS FLAME SENSE

DISCONNECT X2 FROM THE PCB

Next: p3562, !f3563

INSPECTION ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p3566, !f3567

TIGHTNESS TEST INSTALLATION

Next: p3568, !f3569

OBSERVATION FAULT CODE RESET (L06)

Next: !p3570, !f3571

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

OBSERVATION MOVE FLAME SENSE WIRE

MOVE THE WIRE FITTED AT CONNECTOR 5 ON THE SPARK GENERATOR TO CONNECTOR 4

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: !p3711, 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

OBSERVATION SPARK GENERATOR CONNECTIONS

Next: p3561, !f4152

OBSERVATION DISCONNECT FLOW TURBINE (L6)

RECONNECT X6 AT THE

Next: !p4156, !f4157

VOLTAGE TO FLOW SWITCH TURBINE WITH FLOW SWITCH DISCONNECTED

RECONNECT X6 AT THE

Next: !p4161, !f4162

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

System Information

  • Total Tests: 720
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control