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 COMBI ESP1 AND GLOBAL VARIANTS

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &5, !f1228

POWER ON SELF TEST

{ALLDEMANDOFF}
PR

Next: &2652, ?106, ?129, ?940, ?2477, ?2654

PUMP AND FAN RUN DHW DEMAND

SELECTOR SWITCH TO HOT WATER POSITION
DHW TEMPERATURE CONTROL SET TO MAX
PREHEAT OFF

Next: &284, ?960, ?962, ?2482, ?2660

HOT WATER OPERATION

PREHEAT OFF

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

BURNER IGNITES AND ESTABLISHES DHW DEMAND

PREHEAT OFF
ENSURE BOILER IS COOL
SELECTOR SWITCH IN HOT WATER POSITION

Next: &193, ?287, ?289, ?291, ?293

HEATING OPERATION

PREHEAT OFF
ENSURE THE HEATING FLOW AND RETURN VALVES ARE FULLY OPEN
CH THERMOSTAT SET TO MAX

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

PUMP AND FAN OVER RUN

PREHEAT OFF
APPLY A DEMAND FOR HEATING OR HOT WATER

Next: &nff, !f959

FAULT CODES

Next: &nff, !f1086

L1

INTENTIONALLY BLANK - HEADER FOR L1 FAULT CODE

Next: &nff, f2175

F1

INTENTIONALLY BLANK - HEADER FOR F1 FAULT CODE

Next: &nff, f1137

F4 / L4

INTENTIONALLY BLANK - HEADER FOR F4/L4 FAULT CODES

Next: &nff, f1146

F5 / L5

INTENTIONALLY BLANK - HEADER FOR F5/L5 FAULT CODES

Next: &nff, f1151

OBSERVATION BOILER REACTS TO CH DEMAND

PREHEAT OFF
SELECTOR SWITCH TO HEATING AND HOT WATER POSITION

Next: &633, f2126

FURTHER INVESTIGATION FUSES

INTENTIONALLY BLANK - HEADER FOR FUSE INVESTIGATION

Next: &nff, f1714

F7

INTENTIONALLY BLANK - HEADER FOR F7 FAULT CODE

Next: &nff, f1451

LC

INTENTIONALLY BLANK - HEADER FOR LC FAULT CODE

Next: &nff, f1455

FA

INTENTIONALLY BLANK - HEADER FOR FA FAULT CODE

Next: &nff, f1463

DHW FLOW RATE

Next: &39, f1501

F2 / FN / LN

INTENTIONALLY BLANK - HEADER FOR F2/FN/LN FAULT CODES

Next: &nff, f1962

L6

INTENTIONALLY BLANK - HEADER FOR FAULT CODE L6

Next: &nff, f2160

F9 / L9 / F8 / L8

INTENTIONALLY BLANK - HEADER FOR F9/L9/F8/L8 FAULT CODES

Next: &nff, f2264

F6

INTENTIONALLY BLANK - HEADER FOR F6 FAULT CODE

Next: &nff, f2266

FU / FJ - FJ SKIPS FIRST TEST

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, f3257

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

FT

HEADER FOR FAULT CODE - OUTSIDE MODEL

Next: &nff, f3339

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - NO FLOW

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - CONTROL - RETURN

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

F4 - FLOW SENSOR FAULT

THERMISTOR - NO FLOW

Next: End

F5 - RETURN SENSOR FAULT

THERMISTOR - CONTROL - RETURN

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

TO FAN POWER - PUMP SHORT TIME START UP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

BOILER TO TEMP RADS COOL

KIT - PUMP HEAD

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - NO FLOW

Next: End

DHW NOISEY KETTLING

KIT - SIPHON TRAP

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - NO FLOW

Next: End

NO FAN AT START UP

PCB

Next: End

POOR VOLTAGE

Next: End

WONT RESET L5

PCB

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - RETURN

Next: End

FAULT CODE FA

THERMISTOR - NO FLOW

Next: End

POOR FLOW RATE

PACK - DHW

Next: End

FLOW RATE

COLD WATER SUPPLY

Next: End

BURNER DOES NOT IGNITE

KIT - SIPHON TRAP

Next: End

VOLTAGE TO GAS VALVE

PCB

Next: End

BURNER DOES NOT IGNITE

INJECTOR ASSEMBLY

Next: End

BURNER DOES NOT IGNITE

KIT - BURNER

Next: End

BURNER DOES NOT IGNITE

HEAT ENGINE

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

NEW MODELBLOCKED OR DAMAGED

KIT - BURNER

Next: End

SPARKING BUT NO LIGHTING

HEAT ENGINE

Next: End

SPARK BUT NOT LIGHTING

FLUE

Next: End

FAN DOES NOT RUN

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

KIT - SIPHON TRAP

Next: End

BURNER BAFFLES OR NOISY

INJECTOR ASSEMBLY

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

MECHANICAL PHYSICAL OPERATION

KIT - FAN

Next: End

NEW MODEL FLUEWAYS

HEAT ENGINE

Next: End

IGNITES BUT BAFFLES OR NOISY

KIT - BURNER

Next: End

DHW OPERATION BOILER NOISY

KIT - PUMP HEAD

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - CONTROL - RETURN

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

KIT - PUMP HEAD

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - CONTROL - RETURN

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

PCB

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

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 - DETECTION

Next: End

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

THERMISTOR - NO FLOW

Next: End

DHW COOL RADS COOL

THERMISTOR - CONTROL - RETURN

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 ASSEMBLY

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - SIPHON TRAP

Next: End

F2 FAULT CODE

GAS PRESSURE INLET

Next: End

F2 FAULT CODE

ELECTRODE - DETECTION

Next: End

F2 FAULT CODE

KIT - SIPHON TRAP

Next: End

F2 FAULT CODE

INJECTOR ASSEMBLY

Next: End

CH BOILER TEMP LOW SYSTEM TEMP LOW

KNOB POTENTIOMETER - WHITE

Next: End

DHW COOL RADS COOL

KNOB POTENTIOMETER - WHITE

Next: End

NO CH DEMAND 1

HARNESS TIMER OPTION LINK

Next: End

FAN RUNS CH DEMAND

KNOB POTENTIOMETER - WHITE

Next: End

L6 FAULT CODE

ELECTRODE - DETECTION

Next: End

L6 - STICKING OPEN

GAS VALVE KIT

Next: End

L6 FAULT CODE

PCB

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - NO FLOW

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - RETURN

Next: End

F6

HARNESS PELV (LOW VOLTAGE)

Next: End

F9

PCB

Next: End

DU

PCB

Next: End

FU - SHOWING FAULT

THERMISTOR - CONTROL - RETURN

Next: End

FU - SHOWING FAULT

THERMISTOR - NO FLOW

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE - PCB

Next: End

PCB DAMAGED

PCB + LEAK OR SHORT

Next: End

MECHANICAL OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - FAN

Next: End

POWER UP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

PREHEAT SATISFACTORY3

DIVERTOR VALVE - MINEBEA PADDLE BODY KIT (NEW STYLE)

Next: End

POWER UP

OPEN TAP OR LEAK

Next: End

POWER UP

KIT - FLOW SENSOR C/W TURBINE

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - NO FLOW

Next: End

POWER UP - FIRING NO DEMAND

Next: End

PUMP RUNS

REGULATOR - FLOW

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

KIT - BURNER

Next: End

DOES NOT ESTABLISH

ELECTRODE - IGNITION

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

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

F2 FAULT CODE

KIT - BURNER

Next: End

F2 FAULT CODE

HEAT ENGINE

Next: End

F2 FAULT CODE

ELECTRODE - IGNITION

Next: End

F2 FAULT CODE

FLUE

Next: End

FAN RUNS DHW DEMAND

KNOB POTENTIOMETER - WHITE

Next: End

FAN RUNS DHW

THERMISTOR - NO FLOW

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - RETURN

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2

PCB

Next: End

TO FLOW SWITCH - NO HOT WATER DEMAND

HARNESS PELV (LOW VOLTAGE)

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

THERMISTOR - NO FLOW

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

THERMISTOR - CONTROL - RETURN

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - PUMP HEAD

Next: End

RADS COLD BOILER HOT

DIVERTOR VALVE - MINEBEA PADDLE BODY KIT (NEW STYLE)

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - FAN

Next: End

FURTHER INVESTIGATION FUSE F1

UNIT - IGNITOR

Next: End

TO PUMP - NO POWER AT PUMP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODES 3

Z DIRECTION CHOICE OR CONTINUE

Next: End

HYPERLINK

PCB

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

HARNESS PELV (LOW VOLTAGE)

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

PCB

Next: End

CH TEMP LOW

OUTDOOR SENSOR

Next: End

CH TEMP LOW - NO OUTDOOR SENSOR

PCB

Next: End

FIRES WITH NO DEMAND

FROST PROTECTION (INTERNAL)

Next: End

OPERATION CH UP TO TEMP RADS COOL

PACK - CH FLOW / RETURN

Next: End

OPERATION CH UP TO TEMP RADS COOL

Next: End

BOILER HOT RADS COLD

THERMISTOR - NO FLOW

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - RETURN

Next: End

BURNER DOES NOT IGNITE - BAFFLES

GAS PRESSURE INLET

Next: End

OUT OF RANGE (QADAI)

THERMISTOR - CONTROL - RETURN

Next: End

OUT OF RANGE (QADAI)

THERMISTOR - NO FLOW

Next: End

NO POWER TO GAS VALVE (QADAI)

PCB

Next: End

RESISTANCE INCORRECT (QADAI)

KIT - FAN

Next: End

BLANK FOR QUICK ACCESS DATA AND INFORMATION

Z DIRECTION

Next: End

BLANK FOR DIAGNOSICS LITE

Z DIRECTION

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

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY (QADAI)

PCB

Next: End

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

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

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

THERMISTOR - NO FLOW

Next: End

FU - BOILER RESET

THERMISTOR - CONTROL - RETURN

Next: End

FU / FJ TO PUMP - NO POWER AT PUMP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

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 COOL RADS COOL

INTERNAL BYPASS

Next: End

DHW RUNS HOT COLD

INTERNAL BYPASS

Next: End

FU

INTERNAL BYPASS

Next: End

DHW NOISY KETTLING

INTERNAL BYPASS

Next: End

BURNERIGNITES

HARNESS - DETECTION LEAD

Next: End

F2 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

L6 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

DOES NOT RECOGNISE CH DEMAND OLD STYLE TIMER

HARNESS PELV (LOW VOLTAGE)

Next: End

FAN RUNS CH DEMAND DHW COOL RADS COOL

KNOB POTENTIOMETER - WHITE

Next: End

NO CH DEMAND 1 DHW COOL RADS COOL

HARNESS TIMER OPTION LINK

Next: End

FAN RUNS CH DEMAND DHW NOISY

KNOB POTENTIOMETER - WHITE

Next: End

NO CH DEMAND 1 DHW NOISY

HARNESS TIMER OPTION LINK

Next: End

DIVERTER - DHW COOL RADS HOT

HARNESS PELV (LOW VOLTAGE) - OLD DIVERTER

Next: End

PREHEAT SATISFACTORY3

DIVERTOR VALVE - PADDLE AND BODY KIT (OLD STYLE)

Next: End

BLOCKED PREHEAT SAT3 OLD DIVERTER

KIT - PLATE HEAT EXCHANGER

Next: End

BOILER HOT RADS COLDOLD DIVERTER

THERMISTOR - NO FLOW

Next: End

BOILER HOT RADS COLDOLD DIVERTER

THERMISTOR - CONTROL - RETURN

Next: End

RADS COLD BOILER HOT

DIVERTOR VALVE - PADDLE AND BODY KIT (OLD STYLE)

Next: End

DIVERTER - OPERATION CH UP TO TEMP RADS COOL

HARNESS PELV (LOW VOLTAGE) - OLD DIVERTER

Next: End

L1

PACK - CH FLOW / RETURN

Next: End

L1 - OUT OF CALIB

THERMISTOR - NO FLOW

Next: End

L1 - OUT OF CALIB

THERMISTOR - CONTROL - RETURN

Next: End

L1

DIVERTOR VALVE - MINEBEA PADDLE BODY KIT (NEW STYLE)

Next: End

L1 - NO POWER TO PUMP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

L1 RUNNING SLOW

KIT - PUMP HEAD

Next: End

L1

HEAT ENGINE

Next: End

L1

KIT - PLATE HEAT EXCHANGER

Next: End

L1 - NO POWER TO PUMP OLD DIVERTER

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

L1 RUNNING SLOW OLD DIVERTER

KIT - PUMP HEAD

Next: End

L1 OLD DIVERTER

HEAT ENGINE

Next: End

L1 OLD DIVERTER

KIT - PLATE HEAT EXCHANGER

Next: End

DIVERTER - L1

HARNESS PELV (LOW VOLTAGE) - OLD DIVERTER

Next: End

L1

DIVERTOR VALVE - PADDLE AND BODY KIT (OLD STYLE)

Next: End

DIVERTER - L1

HARNESS PELV (LOW VOLTAGE) - NEW DIVERTER

Next: End

DIVERTER - DHW COOL RADS HOT

HARNESS PELV (LOW VOLTAGE) - NEW DIVERTER

Next: End

QADAI DIVERTER RESISTANCE

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

DIVERTER - OPERATION CH UP TO TEMP RADS COOL

HARNESS PELV (LOW VOLTAGE) - NEW DIVERTER

Next: End

QADAI DIVERTER RESISTANCE

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

DOES NOT RECOGNISE CH DEMAND

HARNESS PELV (LOW VOLTAGE)

Next: End

DOES NOT RECOGNISE CH DEMANDDHW NOISY OLD STYLE TIMER

HARNESS PELV (LOW VOLTAGE)

Next: End

DOES NOT RECOGNISE CH DEMAND DHW NOISY

HARNESS PELV (LOW VOLTAGE)

Next: End

DOES NOT RECOGNISE CH DEMAND OLD STYLE TIMER DHW COOL RADS COOL

HARNESS PELV (LOW VOLTAGE)

Next: End

DOES NOT RECOGNISE CH DEMAND DHW COOL RADS COOL

HARNESS PELV (LOW VOLTAGE)

Next: End

RESISTANCE WRONG QADAI

UNIT - IGNITOR

Next: End

NO VOLTAGE TO SPARK GENERATOR (QADAI)

PCB

Next: End

QADAI

KIT - FLOW SENSOR C/W TURBINE

Next: End

FT

INTERNAL TIMER

Next: End

L1

Next: End

FA

KIT - PUMP HEAD

Next: End

FA - NO POWER AT PUMP

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

TO SPARK GEN - NO SPARK

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

NOT SPARKING

LEAD - IGNITION

Next: End

UNDER PRESSURE

KIT - EXPANSION VESSEL

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS PRESSURE INLET

Next: End

HOT WATER CYCLING

THERMISTOR - CONTROL - RETURN

Next: End

BLOCKED PREHEAT SAT3

KIT - PLATE HEAT EXCHANGER

Next: End

HOT WATER CYCLING

THERMISTOR - NO FLOW

Next: End

NO FAN AT START UP

HARNESS PELV (LOW VOLTAGE)

Next: End

LOW GAS RATE CH OPERATION

INJECTOR ASSEMBLY

Next: End

EXTERNAL FROST PROTECT

EXTERNAL FROST PROTECT

Next: End

NO OVERRUNS

PCB

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - RETURN

Next: End

HOT WATER TOO HOT

THERMISTOR - NO FLOW

Next: End

TO FLOW SENSOR F4 - FLOW SENSOR FAULT

HARNESS PELV (LOW VOLTAGE)

Next: End

F4 - FLOW SENSOR FAULT

PCB

Next: End

TO RETURN SENSOR F5 - RETURN SENSOR FAULT

HARNESS PELV (LOW VOLTAGE)

Next: End

F5 - RETURN SENSOR FAULT

PCB

Next: End

NO MAINS TO FAN AT START UP

PCB

Next: End

ELECTRICAL OVER 15V ON N

KIT - FAN

Next: End

CH OPERATION NOISEY

Next: End

CH OPERATION NOISY

HEAT ENGINE

Next: End

LETBY PREHEAT3

DIVERTOR VALVE - MINEBEA PADDLE BODY KIT (NEW STYLE)

Next: End

FALSE LOW VOLTAGE

PCB

Next: End

L5 - RESTART FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE FA

HARNESS PELV (LOW VOLTAGE)

Next: End

FAULT CODE FA - FLOW SENSOR

HARNESS PELV (LOW VOLTAGE)

Next: End

FAULT CODE FA

PCB

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

NO FAN AT START UP

KIT - FAN

Next: End

IGNITES BUT BAFLLES OR NOISY

GAS VALVE KIT

Next: End

DHW NOISY KETTLING

HEAT ENGINE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

UNIT - IGNITOR

Next: End

DHW COOL RADS COOL

HEAT ENGINE

Next: End

DHW COOL RADS COOL

EXTERNAL HOT WATER FAULT

Next: End

FAN RUNS CH DEMAND 1

Next: End

NOT RESPONDING TO HEATING 2

PCB

Next: End

NO CH 2

HARNESS PELV (LOW VOLTAGE)

Next: End

NO CH DEMAND

Next: End

BLANK FOR L6 FAULT CODE RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

F6

PCB

Next: End

F6

OUTDOOR SENSOR

Next: End

F9

PCB INITIAL SETUP

Next: End

DU

Z DIRECTION CHOICE OR CONTINUE

Next: End

FU

PCB

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

POWER OK PCB DEAD

PCB

Next: End

INTEGRAL FUSE FATIGUED

PCB

Next: End

POWER UP - FIRING UP WITH NO DHW DEMAND

PCB

Next: End

POWER UP - FIRING WITH NO FROST DEMAND

PCB

Next: End

ON WITH NO DEMAND - FROST

PCB

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB

Next: End

DHW COOL RADS COOL

PCB

Next: End

F2 FAULT CODE

PCB

Next: End

FAN DOES NOT RUN DHW

PCB

Next: End

FAN RUNS DHW DEMAND - NO FAN

PCB

Next: End

FAN DOES NOT RUN

KIT - FLOW SENSOR C/W TURBINE

Next: End

FAN RUNS DHW DEMAND - IGNORING DEMAND

PCB

Next: End

BURNER IGNITES AND ESTABLISHES - NO SPARKING

PCB

Next: End

L1 - STUCK IN FAULT

PCB

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

FURTHER INVESTIGATION FUSE F1

PCB

Next: End

TO SPARK GEN - FURTHER INVESTIGATION FUSE F1

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

DHW DEMAND STOPS QUICKLY

KIT - PUMP HEAD

Next: End

NOT OPENING - MECHANICAL

GAS VALVE KIT

Next: End

RADS COLD BOILER HOT - MECHANICAL FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

RADS COLD BOILER HOT

PCB

Next: End

RADS HEAT WITH NO DEMAND - MECHANICAL FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

RADS HEAT WITH NO DEMAND

PCB

Next: End

RADS HEAT WITH NO DEMAND

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS DHW DEMAND - PUMP RUNNING CONTINUALLY

KIT - PUMP HEAD

Next: End

LOW SYSTEM TEMP POT

PCB

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

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

Next: End

ELECTRICAL OVER 15V ON N (QADAI)

KIT - 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

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

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

DHW COOL RADS COOL

KIT - PLATE HEAT EXCHANGER

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

BURNER IGNITES AND ESTABLISHES - FLAME SENSE

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

F2 FAULT CODE - FLAME SENSE

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

L6 FAULT CODE - FLAME SENSE

HARNESS MAINS - BOILER MAINS VOLTAGE HARNESS

Next: End

NO CH DEMAND 1

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1

PCB

Next: End

FAN RUNS CH DEMAND 1 DHW COOL RADS COOL

Next: End

NOT RESPONDING TO HEATING 2 DHW COOL RADS COOL

PCB

Next: End

NO CH 2 DHW COOL RADS COOL

HARNESS PELV (LOW VOLTAGE)

Next: End

NO CH DEMAND DHW COOL RADS COOL

Next: End

FAN RUNS CH DEMAND 1 DHW NOISY

Next: End

NOT RESPONDING TO HEATING 2 DHW NOISY

PCB

Next: End

NO CH 2 DHW NOISY

HARNESS PELV (LOW VOLTAGE)

Next: End

NO CH DEMAND DHW NOISY

Next: End

RADS HEAT WITH NO DEMAND - MECHANICAL FAULT

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

RADS HEAT WITH NO DEMAND OLD DIVERTER

PCB

Next: End

RADS HEAT WITH NO DEMAND

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

LETBY PREHEAT3

DIVERTOR VALVE - PADDLE AND BODY KIT (OLD STYLE)

Next: End

RADS COLD BOILER HOTOLD DIVERTER

PCB

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLDOLD DIVERTER

Next: End

RADS COLD BOILER HOT - MECHANICAL FAULT

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

RADS COLD BOILER HOT

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

L1 - MECH FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

L1 - VOLTAGE TO DV

PCB

Next: End

L1 - ELEC FAULT

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

L1 - NO PUMP

PCB

Next: End

L1 - NOT RUNNING

KIT - PUMP HEAD

Next: End

L1

INTERNAL BYPASS

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

L1 - VOLTAGE TO DV OLD DIVERTER

PCB

Next: End

L1 - NO PUMP OLD DIVERTER

PCB

Next: End

L1 - NOT RUNNING OLD DIVERTER

KIT - PUMP HEAD

Next: End

L1 OLD DIVERTER

INTERNAL BYPASS

Next: End

ALL CHECKS OK RETEST MODEL OLD DIVERTER

NO FAULT - OVERHEAT / L1

Next: End

LEAKING POC OLD DIVERTER

KIT - REPLACEMENT - SUMP & COVER

Next: End

LEAKING POC OLD DIVERTER

MANIFOLD - FLUE

Next: End

L1 - ELEC FAULT

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

L1 - MECH FAULT

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

QADAI DIVERTER VOLTAGE OLD DIVERTER

PCB

Next: End

QADAI DIVERTER VOLTAGE

24 VOLT DIVERTOR MOTOR (OLD STYLE)

Next: End

DIVERTER VOLTAGE OLD VALVE

RESULT AS EXPECTED

Next: End

DIVERTER RESISTANCE OLD VALVE

RESULT AS EXPECTED

Next: End

DIVERTER RESISTANCE

RESULT AS EXPECTED

Next: End

QADAI DIVERTER VOLTAGE

PCB

Next: End

QADAI DIVERTER VOLTAGE

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

DIVERTER VOLTAGE

RESULT AS EXPECTED

Next: End

RADS COLD BOILER HOT

DIVERTOR VALVE - MOTOR KIT MINEBEA 24V (NEW STYLE)

Next: End

NO CH DEMAND 1 NEW

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1 NEW

PCB

Next: End

NO CH DEMAND 1DHW NOISY

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1DHW NOISY

PCB

Next: End

NO CH DEMAND 1 NEWDHW NOISY

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1 NEWDHW NOISY

PCB

Next: End

NO CH DEMAND 1DHW NOISY DHW COOL RADS COOL

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1DHW DHW COOL RADS COOL

PCB

Next: End

NO CH DEMAND 1 NEW DHW COOL RADS COOL

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1 NEW DHW COOL RADS COOL

PCB

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

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

FA PUMP

PCB

Next: End

FA - NOT RUNNING

KIT - PUMP HEAD

Next: End

NO SPARKING

UNIT - IGNITOR

Next: End

POOR CONDITION - NO SPARK

ELECTRODE - IGNITION

Next: End

DHW TOO HOT

PCB

Next: End

EXPANSION CONNECTION

KIT - PIPE - EXPANSION VESSEL

Next: End

TO RETURN SENSOR - HOT WATER CYCLING

HARNESS PELV (LOW VOLTAGE)

Next: End

TO HEATING SENSOR - HOT WATER CYCLING

HARNESS PELV (LOW VOLTAGE)

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCURTEMP

PCB

Next: End

MIXING - HOT WATER CYCLING

EXTERNAL HOT WATER FAULT

Next: End

NO DISPLAY SEEN

CHARACTERISTIC TEST FROM POWER UP

Next: p2364

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p1230

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p1233

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM POWER UP

Next: p130

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p3114

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p1307

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

TEMPERATURE DIFFERENTIAL EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p1863

DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3097

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p571

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: p3131

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2924

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2962

DHW DEMAND (TAP SYMBOL) SHOWING

CHARACTERISTIC TEST FROM OBSERVATION WHICH DEMAND IS SHOWING

Next: p2426

DISPLAY ALTERNATING FP (FROST PROTECTION) AND FLOW TEMPERATURE

CHARACTERISTIC TEST FROM OBSERVATION WHICH DEMAND IS SHOWING

Next: p2674

DISPLAY SHOWS - - TWO DASHES

CHARACTERISTIC TEST FROM POWER UP

Next: p2479

NO TAP SYMBOL AND NEITHER THE FAN NOR THE PUMP RUN

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p2492

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p2635

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3285

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p2639

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p2641

FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM POWER UP

Next: p2655

PUMP RUNNING CONTINUALLY WITHOUT DEMAND

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p2661

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 (AT PCB)

Next: !p2838

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p2844

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p494

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1763

BURNER IGNITES BUT DOES NOT ESTABLISH - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1841

SYSTEM PRESSURE OK BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION WHICH DEMAND IS SHOWING

Next: !p2921

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM 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 OBSERVATION WHICH DEMAND IS SHOWING

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 OBSERVATION WHICH DEMAND IS SHOWING

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 OBSERVATION WHICH DEMAND IS SHOWING

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 OBSERVATION WHICH DEMAND IS SHOWING

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

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3201

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3051

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3213

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3214

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3151

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3153

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3182

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3184

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3221

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: p3223

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3245

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3247

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3261

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3263

VOLTAGE MISSING ON PIN 5

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3279

VOLTAGE MISSING ON ANY OF PINS 1 TO 4

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE

Next: !p3281

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 OBSERVATION WHICH DEMAND IS SHOWING

Next: !p3437

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE AND RISE

Next: !p3439

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: p2057

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p645

BOILER FIRES WITH NO HEATING OR HOT WATER DEMAND

CHARACTERISTIC TEST FROM POWER UP

Next: p2403

DISPLAY SHOWS TAP SYMBOL BUT PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p2553

DISPLAY SHOWS TAP SYMBOL BUT FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p2487

10/11/2022 12:18:07 1912_3_50_1 17/11/2022 14:56:13

10/11/2022 15:32:16

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 SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p1148, !f1149

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p1155, f1152

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p1153, !f1154

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

PREHEAT OFF
WAIT APPROXIMATELY 15 SECONDS

Next: !p1457, !f1456

OBSERVATION PUMP RUNS

Next: p3440, f3452

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p1468, !f1469

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p1478, !f1479

SERVICE VALVE

Next: p1502, !f1503

RESISTANCE FAN / PUMP AND HARNESS

REMOVE CONNECTOR X1 FROM THE PCB

Next: p2548, f2514

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN

Next: p1801, !f1802

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: p2862, ?1862, ?1864

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1894, !f1895

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1963, !f1964

INSPECTION SELECTOR SWITCH KNOB

Next: p2127, !f2150

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2130, f2131

RESISTANCE BYPASSED EXTERNAL CONTROLS AND HARNESS

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

Next: !p2132, f2133

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2134, !f2135

OBSERVATION BYPASS INTERNAL TIMER (OLD STYLE)

DISCONNECT THE TIMER

Next: !p3091, f3094

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2161, f2853

RESET BOILER

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p2176, f2177

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

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 FU

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

DISCONNECT PLUG FROM

Next: p2281, !f2282

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p2367, f2368

3AMP FUSE FAULTY

Next: !p2369, !f2370

PCB FUSE FAULTY

Next: !p2373, !f2374

INFORMATION INTEGRAL FUSE

Next: !p2377, !f2378

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2494, !f2495

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2500, !f2501

RESISTANCE PUMP

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

Next: p2545, !f2516

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p2627, ?2628, ?2630

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2551, !f2552

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOL

Next: !p2562, !f2563

RESISTANCE HARNESS GAS VALVE

REMOVE CONNECTOR FROM GAS VALVE

Next: !p2575, !f2812

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p2637, ?2638, ?2640

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p2783, !f2784

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p2787, !f2788

VOLTAGE GAS VALVE AT PCB

PULL CONNECTOR X3 BACK SLIGHTLY TO EXPOSE TEST POINTS

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 (

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

Next: !p2829, !f2824

VOLTAGE PUMP SPEED CONTROL

DISCONNECT PUMP SPEE

Next: !p2836, !f2833

RESISTANCE ELECTRODE SENSE HARNESS CONNECTOR

DISCONNECT FLAME SEN

Next: !p3086, !f3085

RESISTANCE ELECTRODE SENSE HARNESS CONNECTOR

DISCONNECT FLAME SEN

Next: !p3087, !f3088

RESISTANCE ELECTRODE SENSE HARNESS CONNECTOR

DISCONNECT FLAME SEN

Next: !p3089, !f3090

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 VOL

Next: !p3015, !f3016

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: p3025, !f3026

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3200, ?3048, ?3050

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3205, f3059

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOL

Next: !p3206, !f3207

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: p3066, !f3209

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3095, !f3096

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3102, f3103

RESISTANCE BYPASSED EXTERNAL CONTROLS AND HARNESS

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

Next: !p3104, f3105

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p3106, !f3107

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3119, f3120

RESISTANCE BYPASSED EXTERNAL CONTROLS AND HARNESS

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

Next: !p3121, f3122

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p3123, !f3124

INSPECTION DIVERTER VALVE HEAD DHW POSITION

PREHEAT OFF
REMOV

Next: p3147, f3148

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3149, ?3150, ?3152

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

PREHEAT OFF
REMOV

Next: p3178, f3179

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3194, ?3181, ?3183

INSPECTION DIVERTER VALVE HEAD OPERATION

SELECTOR SWITCH SET

Next: p3217, f3218

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3250, ?3220, ?3222

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3230, f3231

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOL

Next: !p3232, !f3233

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: p3238, !f3239

OBSERVATION TYPE OF DIVERTER MOTOR

Next: p3276, f3258

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3266, ?3260, ?3262

OBSERVATION TYPE OF DIVERTER MOTOR

Next: p3268, f3269

RESISTANCE DIVERTER VALVE AND HARNESS (OLD VALVE)

DISCONNECT X4 FROM THE PCB

Next: !p3274, !f3271

OBSERVATION TYPE OF TIMER CONNECTION

UNCLIP TIMER FROM THE FRONT OF THE APPLIANCE

Next: p3297, f2141

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3300, !f3301

OBSERVATION TYPE OF TIMER CONNECTION

UNCLIP TIMER FROM THE FRONT OF THE APPLIANCE

Next: p3303, f3304

OBSERVATION BYPASS INTERNAL TIMER (OLD STYLE)

DISCONNECT THE TIMER

Next: !p3305, f3306

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3307, !f3308

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3311, !f3312

OBSERVATION TYPE OF TIMER CONNECTION

UNCLIP TIMER FROM THE FRONT OF THE APPLIANCE

Next: p3314, f3315

OBSERVATION BYPASS INTERNAL TIMER (OLD STYLE)

DISCONNECT THE TIMER

Next: !p3316, f3317

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3318, !f3319

RESISTANCE HARNESS INTERNAL TIMER

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

Next: !p3322, !f3323

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p3331, !f3332

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN

Next: !p3333, !f3334

VOLTAGE FROM HOT WATER FLOW TURBINE

PULL CONNECTOR X6 BACK SLIGHTLY TO EXPOSE TEST POINTS
SET FLOW RATE TO 3 LITRES/MIN

Next: !p3337, !f3336

OBSERVATION DISCONNECT INTERNAL TIMER

REMOVE AND DISCONNEC

Next: !p3340, !f3341

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p3453, f3454

RESISTANCE HARNESS PUMP

DISCONNECT MAINS VOL

Next: !p3455, !f3456

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN

Next: p496, f2499

INSPECTION INTERNAL BYPASS

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

Next: !p3078, !f3079

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p787, !f848

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p784, !f785

RESISTANCE HARNESS FAN POWER

DISCONNECT MAINS VOLTAGE PLUG FROM FAN
PULL X1 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p1236, !f1235

VOLTAGE FAN (AT PCB) - MAINS

GAIN ACCESS TO PCB (

Next: p133, ?1229, ?1231

CHECK FOR NOISE ON HEATING DEMAND

PREHEAT OFF
ENSURE HEATING FLOW AND RETURN VALVES ARE FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: p1303, ?1304, ?1306

INSPECTION CONDENSATE

Next: p3082, !f1320

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p1308, !f1309

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: p1755, !f1758

HEATING FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTACH TEMP PROBES TO THE FLOW AND RETURN PIPES AS CLOSE TO THE BOILER AS POSSIBLE

Next: p1323, ?1324, ?1326

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p1328, !f1329

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: p1759, !f1762

VOLTAGE FAN CONTROL (AT PCB)

REMOVE DC ELECTRICAL

Next: p134, !f137

RESISTANCE HARNESS FAN CONTROL

REMOVE LOW VOLTAGE CONNECTOR FROM FAN
PULL X5 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: p1675, !f852

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

PREHEAT OFF
REMOV

Next: p2530, f2539

RESISTANCE SENSOR TEMP RETURN AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: p1465, f1467

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p1480, f1477

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: p2749, ?1560, ?1562

INSPECTION BURNER

REMOVE THE BURNER

Next: p1578, !f1579

VOLTAGE GAS VALVE AT PCB

PULL CONNECTOR X3 BACK SLIGHTLY TO EXPOSE TEST POINTS

Next: p1564, !f1565

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p1568, 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 FLUE

Next: !p1576, !f1577

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 FLUE

Next: !p1588, !f1589

RESISTANCE HARNESS FAN POWER

DISCONNECT MAINS VOLTAGE PLUG FROM FAN
PULL X1 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p1676, !f1677

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: !p1756, !f1757

PUMP LIMPET TEST

Next: !p1760, !f1761

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: p1555, f1800

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE CONNECTOR FROM SPARK GENERATOR
PULL X1 AND X2 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: p1803, !f1804

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p1805, !f1806

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1842, !f1843

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1844, f2847

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2454, !f1847

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p1855, !f1856

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: p1857, !f1858

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p1859, f1860

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1890, !f1891

GAS RATE

Next: !p1892, f1893

INSPECTION CONDENSATE

Next: p2381, !f1897

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1965, f2850

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1967, !f1968

INSPECTION CONDENSATE

Next: p1969, !f1970

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p2468, !f1972

INSPECTION DIVERTER VALVE HEAD DHW POSITION

PREHEAT OFF
REMOV

Next: p234, f2636

INSPECTION CH CONTROL KNOB

Next: p639, !f2067

INSPECTION DHW CONTROL KNOB

Next: p1854, !f2125

OBSERVATION INTERNAL TIMER

Next: p2128, f2129

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2140, f3291

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2163, !f2164

TIGHTNESS TEST INSTALLATION

Next: p2165, !f2166

OBSERVATION FAULT CODE RESET (L6)

Next: !p2167, !f2168

INSPECTION SYSTEM PRESSURE AND RISE

Next: p3038, ?3033, ?3035

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p2504, !f2181

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p2283, !f2284

INSPECTION SYSTEM PRESSURE AND RISE

Next: p3006, ?3001, ?3003

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p240, !f241

VOLTAGE MAINS POWER SUPPLY AT TERMINAL BLOCK

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

Next: p2392, f2366

RESISTANCE FUSE F2 (APPLIANCE)

Next: p2371, f2372

RESISTANCE PCB INTEGRAL FUSE

Next: !p2375, f2376

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p2461, !f2383

VOLTAGE MAINS POWER SUPPLY AT PCB

GAIN ACCESS TO PCB (

Next: p2365, !f2402

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p1422, !f812

OBSERVATION WHICH DEMAND IS SHOWING

Next: p2434, ?2422, ?2424

RESISTANCE SENSOR TEMP FLOW AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X7 FROM PCB

Next: !p2431, !f2432

OBSERVATION ISOLATE DHW

TURN THE DHW ISOLATION VALVE OFF

Next: p2427, !f2428

OBSERVATION DISCONNECT FLOW TURBINE

UNPLUG ELECTRICAL CONNECTOR AT FLOW TURBINE AND MAKE SAFE

Next: !p2429, !f2430

VOLTAGE EXTERNAL CONTROLS (NO DEMAND)

{ALLDEMANDOFF}
GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: p942, !f2448

INSPECTION BURNER

REMOVE THE BURNER

Next: p2455, !f2456

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2457, !f2458

INSPECTION FLUE

Next: !p2459, !f2460

INSPECTION BURNER

REMOVE THE BURNER

Next: p2462, !f2463

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p2464, !f2465

INSPECTION FLUE

Next: !p2466, !f2467

INSPECTION BURNER

REMOVE THE BURNER

Next: p2469, !f2470

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p2471, !f2472

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2473, !f2474

INSPECTION FLUE

Next: !p2475, !f2476

INSPECTION SELECTOR SWITCH KNOB

Next: !p2480, !f2481

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2488, !f2489

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p2490, !f2491

VOLTAGE FROM HOT WATER FLOW TURBINE

PULL CONNECTOR X6 BACK SLIGHTLY TO EXPOSE TEST POINTS
SET FLOW RATE TO 3 LITRES/MIN

Next: !p2498, f2493

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR FROM THE DHW FLOW TURBINE
PULL X6 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p2496, !f2497

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p2502, !f2503

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p2743, !f2532

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

OBSERVATION DISCONNECT PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL AND MAKE SAFE

Next: !p981, f2561

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p2642, !f3253

FAULT CODES

Next: !p2656, !f2657

VOLTAGE PUMP SPEED CONTROL

DISCONNECT PUMP SPEE

Next: p2662, !f2665

RESISTANCE HARNESS PUMP SPEED CONTROL

DISCONNECT PUMP SPEED CONTROL

Next: !p2663, !f2664

RESISTANCE OUTDOOR SENSOR AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X8 FROM PCB

Next: !p2667, !f2668

OBSERVATION IS WEATHER COMPENSATION FITTED

Next: p2666, !f2673

OBSERVATION AMBIENT TEMPERATURE

Next: p2425, !f2678

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2722, !f2721

INSPECTION SYSTEM PRESSURE AND RISE

Next: p742, ?2981, ?2983

INSPECTION EXTERNAL BYPASS

Next: p3160, !f2741

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2744, !f2745

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p2748, !f2747

INSPECTION SUMP AND FLUE MANIFOLD

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
PULL X1 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p2845, !f2846

INSPECTION INTERNAL BYPASS

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

Next: !p3076, !f3077

INSPECTION SYSTEM PRESSURE AND RISE

Next: p2068, ?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

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p3007, !f3008

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

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

PREHEAT OFF
ATTAC

Next: p3023, f3024

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

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

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p3041, !f3198

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: p3215, !f3199

INSPECTION DIVERTER VALVE HEAD OPERATION

SELECTOR SWITCH SET

Next: p3045, f3046

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p3054, !f3204

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3202, !f3252

OBSERVATION PUMP RUNS

Next: p3056, f3057

PUMP LIMPET TEST

Next: p3062, !f3208

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p3064, f3065

INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3212, ?3072, ?3074

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p3210, !f3211

INSPECTION INTERNAL BYPASS

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

Next: !p3083, !f3084

INSPECTION SELECTOR SWITCH KNOB

Next: p3098, !f3099

OBSERVATION INTERNAL TIMER

Next: p3100, f3101

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3108, f3313

INSPECTION SELECTOR SWITCH KNOB

Next: p3115, !f3116

OBSERVATION INTERNAL TIMER

Next: p3117, f3118

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p3125, f3302

OBSERVATION TYPE OF DIVERTER MOTOR

Next: p199, f3146

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p3156, !f3157

RESISTANCE HARNESS DIVERTER VALVE (OLD VALVE)

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3154, !f3155

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p3158, !f3159

OBSERVATION TYPE OF DIVERTER MOTOR

Next: p1428, f3177

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p3187, !f3193

RESISTANCE HARNESS DIVERTER VALVE (OLD VALVE)

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3195, !f3196

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p3189, !f3190

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: !p3191, !f3192

OBSERVATION TYPE OF DIVERTER MOTOR

Next: p3043, f3216

INSPECTION DIVERTER VALVE PADDLE

UNCLIP AND REMOVE DIVERTER VALVE MOTOR

Next: p3226, !f3251

RESISTANCE HARNESS DIVERTER VALVE (OLD VALVE)

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3249, !f3248

OBSERVATION PUMP RUNS

Next: p3228, f3229

PUMP LIMPET TEST

Next: p3234, !f3235

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p3236, f3237

INSPECTION SUMP AND FLUE MANIFOLD

Next: !p3242, ?3244, ?3246

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p3240, !f3241

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT X4 FROM THE PCB

Next: !p3275, !f3288

VOLTAGE DIVERTER VALVE

PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3284, ?3278, ?3280

RESISTANCE HARNESS DIVERTER VALVE

REMOVE PLUG FROM DIVERTER VALVE MOTOR
PULL X4 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: !p3286, !f3287

OBSERVATION BYPASS INTERNAL TIMER

DISCONNECT THE TIMER

Next: !p3298, f3299

OBSERVATION BYPASS INTERNAL TIMER

DISCONNECT THE TIMER

Next: !p3309, f3310

OBSERVATION BYPASS INTERNAL TIMER

DISCONNECT THE TIMER

Next: !p3320, f3321

INSPECTION EXTERNAL BYPASS

Next: p3039, !f3412

INSPECTION SUMP AND FLUE MANIFOLD

Next: p1687, ?3419, ?3421

INSPECTION SYSTEM PRESSURE AND RISE

Next: p1322, ?3436, ?3438

PUMP LIMPET TEST

Next: p1464, !f3451

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: !p509, f495

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE CONNECTOR FROM SPARK GENERATOR
PULL X1 AND X2 BACK SLIGHTLY TO EXPOSE TEST PINS

Next: p505, !f502

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p506, !f507

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p838, !f998

GAS INLET PRESSURE

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p660, !f661

EXPANSION VESSEL PRESSURE

SYSTEM PRESSURE DISCHARGED

Next: !p646, !f647

GAS RATE

Next: p856, !f855

PUMP LIMPET TEST

Next: p2679, !f1262

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

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

DISCONNECT PLUG FROM

Next: !p572, !f997

RESISTANCE SENSOR TEMP FLOW

REMOVE THE ELECTRICAL CONNECTOR FROM THE FLOW SENSOR ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p860, !f1009

RESISTANCE SENSOR TEMP RETURN

DISCONNECT PLUG FROM

Next: p2669, !f1010

VOLTAGE EXTERNAL FROST STAT

GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: !p2450, !f957

System Information

  • Total Tests: 792
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control