XSol Diagnostic System

IDEAL I-MINI AND LOGIC COMBI SERIAL NUMBER PRE ABD - BRASS HYDROBLOCK & 3 THERMISTORS

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &2948, !f1228

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f1227

POWER ON SELF TEST

{ALLDEMANDOFF}
PR

Next: &27, ?106, ?129, ?131, ?521, ?940

DHW FLOW RATE

Next: &39, f28

PUMP AND FAN RUN DHW DEMAND

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

Next: &284, ?960, ?962

HOT WATER OPERATION

PREHEAT OFF

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

BURNER IGNITES AND ESTABLISHES DHW DEMAND

DHW TEMPERATURE CONTROL SET TO MAX
PREHEAT OFF
ENSURE SELECTOR SWITCH IS 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, ?642, ?644

PUMP AND FAN OVER RUN

PREHEAT OFF
APPLY A DEMAND FOR HEATING OR HOT WATER

Next: &nff, !f959

FAULT CODES

Next: &nff, !f1086

F1

OK TO BE BLANK

Next: &nff, f1137

F4

OK TO BE BLANK

Next: &nff, f1146

F5

OK TO BE BLANK

Next: &nff, f1151

L6

Next: &nff, f1192

C2 BCC ERROR

OK TO BE BLANK

Next: &nff, f1206

FAN RUNS CH DEMAND

PREHEAT OFF
SELECTOR SWITCH TO HEATING AND HOT WATER POSITION

Next: &633, f2439

FURTHER INVESTIGATION FUSES

OK TO BE BLANK

Next: &nff, f1884

F7

OK TO BE BLANK

Next: &nff, f1451

L5

OK TO BE BLANK

Next: &nff, f1455

FA

OK TO BE BLANK

Next: &nff, f1463

HEADER FOR FAULT CODE L1 AND L3

INTENTIONALLY BLANK - HEADER FOR FAULT CODE L1 AND L3

Next: &nff, f1763

F2

OK TO BE BLANK

Next: &nff, f2095

NEW QADAI OPTIONS

OUTSIDE MODEL

Next: &nff, ?2627, ?2629, ?2631, ?2633, ?2635, ?2637, ?2639, ?2641, ?2643, ?2645, ?2647, ?2649, ?2653, ?2655, ?2657, ?2659, ?2661, ?2704, ?2881

F0

INTENTIONALLY BLANK HEADER FOR FAULT CODE

Next: &nff, f2914

INFORMATION XSOL MODEL VERSION

ENSURE THE HYDROBLOC

Next: &3, !f2949

OPERATION CH OK NO REFIRE

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

OPERATION CH OK NO REFIRE

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PREHEAT SATISFACTORY3

PCB - PRIMARY

Next: End

TO LOW WATER PRESSURE SWITCH

HARNESS - LOW VOLTAGE

Next: End

LOW WATER ON START UP

TRANSDUCER - WATER PRESSURE (BLOCKED)

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

TO LWPS F1 - LOW WATER FAULT

HARNESS - LOW VOLTAGE

Next: End

F1 - LOW WATER FAULT

TRANSDUCER - WATER PRESSURE

Next: End

F4 - FLOW SENSOR FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

F5 - RETURN SENSOR FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

L6 FAULT CODE

ELECTRODE - DETECTION

Next: End

L6 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

NOT RESPONDING TO HEATING - LINKEDPUMP SU FAN RUNS SPARKING DOES NOT OCCUR

PCB - PRIMARY

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCURTEMP

PCB - PRIMARY

Next: End

C2 BCC ERROR

PCB - PRIMARY

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

TO FAN POWER - PUMP SHORT TIME START UP

HARNESS - MAINS VOLTAGE

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

TO DIVERTER - RADS NOT POOR HOT WATER

HARNESS - MAINS VOLTAGE

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

DHW NOISEY KETTLING

KIT - SIPHON TRAP

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BURNERIGNITES

HARNESS - DETECTION LEAD

Next: End

NO FAN AT START UP

PCB - PRIMARY

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CONDENSATE PIPE

Next: End

POOR VOLTAGE

Next: End

WONT RESET L5

PCB - PRIMARY

Next: End

FA

KIT - PUMP HEAD

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PCB DAMAGED

PCB - PRIMARY AND LEAK OR SHORT

Next: End

FLOW RATE

COLD WATER SUPPLY

Next: End

BURNER BAFFLES OR NOISY

INJECTOR ASSEMBLY

Next: End

NEW MODELBLOCKED OR DAMAGED

KIT - BURNER

Next: End

SPARKING BUT NO LIGHTING

KIT - HEAT ENGINE

Next: End

SPARK BUT NOT LIGHTING

FLUE

Next: End

BURNER DOES NOT IGNITE

KIT - SIPHON TRAP

Next: End

TO GAS VALVE - NO POWER ON IGN

HARNESS - MAINS VOLTAGE

Next: End

NOT OPENING - MECHANICAL

KIT - GAS VALVE

Next: End

BURNER DOES NOT IGNITE

INJECTOR ASSEMBLY

Next: End

BURNER DOES NOT IGNITE

KIT - BURNER

Next: End

BURNER DOES NOT IGNITE

KIT - HEAT ENGINE

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

SENSOR TEMP RETURN FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

DHW POT FAULTY

KIT - CUI BOARD

Next: End

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

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

DHW COOL RADS COOL

THERMISTOR - CONTROL - FLOW/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

RESTICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

CONDENSATE PIPE

Next: End

RESTRICTED OPERATION DHW DHW DOOL RADS COLD NO CH DEMAND

KIT - HEAT ENGINE

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

FLUE

Next: End

LOW SYSTEM TEMP POTOPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - CUI BOARD

Next: End

FAN DOES NOT RUN

HARNESS - MAINS VOLTAGE

Next: End

IGNITES BUT BAFFLES OR NOISY

KIT - BURNER

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

FO-L3 - NO FLOW FAULT - STICKING

KIT - PUMP HEAD

Next: End

RADS COLD BOILER HOT 2

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT2

HARNESS - MAINS VOLTAGE

Next: End

PREHEAT SATISFACTORY4

PCB - PRIMARY

Next: End

TO DIVERTER - RADS NOT POOR HOT WATER2

HARNESS - MAINS VOLTAGE

Next: End

FAULT CODE L3

CARTRIDGE - DIVERTER VALVE

Next: End

FAULT CODE FA

KIT - FLOW GROUP

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - PUMP HEAD

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - FAN

Next: End

FURTHER INVESTIGATION FUSE F1

VALVE HEAD - DIVERTER

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

UNIT - IGNITOR

Next: End

FUSE FURTHER INVESTIGATION

VALVE HEAD DIVERTER - CARTRIDGE DIVERTER

Next: End

F1 - LOW WATER FAULT

SYSTEM PRESSURE

Next: End

F1 LOW WATER FAULT

KIT - PRESSURE GAUGE

Next: End

FAULT CODE L3

SYSTEM PRESSURE

Next: End

L3 NO WATER FLOW

KIT - PRESSURE GAUGE

Next: End

POOR GAS RATE

KIT - BURNER

Next: End

DHW OPERATION BOILER NOISY

KIT - PUMP HEAD

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

KIT - PUMP HEAD

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

LOW GAS RATE CH OPERATION

INJECTOR ASSEMBLY

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2

PCB - PRIMARY

Next: End

TO FLOW SWITCH - NO HOT WATER DEMAND

HARNESS - LOW VOLTAGE

Next: End

FAN DOES NOT RUN

FLOW TURBINE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

PCB - PRIMARY

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS - MAINS VOLTAGE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

LEAD - IGNITION

Next: End

F2 FAULT CODE

GAS PRESSURE INLET

Next: End

F2 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

F2 FAULT CODE

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

KIT - BURNER

Next: End

F2 FAULT CODE

ELECTRODE - DETECTION

Next: End

F2 FAULT CODE

KIT - SIPHON TRAP

Next: End

F2 FAULT CODE

KIT - BURNER

Next: End

PUMP ONLY RUNS FOR A FEW SECS

KIT - PRESSURE GAUGE

Next: End

F2 FAULT CODE

ELECTRODE - IGNITION

Next: End

F2 FAULT CODE

KIT - HEAT ENGINE

Next: End

F2 FAULT CODE

INJECTOR ASSEMBLY

Next: End

F2 FAULT CODE

KIT - GAS VALVE

Next: End

MECHANICAL OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - FAN

Next: End

GAS VALVE FILTER RESTRICTED

KIT - GAS VALVE

Next: End

BURNER IGNITES

ELECTRODE - DETECTION

Next: End

GAS VALVE INLET FILTER RESTRICTED

KIT - GAS VALVE

Next: End

NOT RESPONDING TO CH 1

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 2

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 5

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 6

KIT - CUI BOARD

Next: End

NO CH DEMAND

INTERNAL TIMER

Next: End

NO CH DEMAND 2

INTERNAL TIMER

Next: End

NOT RESPONDING TO HEATING 1

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 7

KIT - CUI BOARD

Next: End

NO CH DEMAND 2

PLUG - TIMER LINK

Next: End

NO CH DEMAND

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH

KIT - CUI BOARD

Next: End

DOES NOT ESTABLISH

ELECTRODE - IGNITION

Next: End

FAN RUNS DHW DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

PREHEAT SATISFACTORY3

CARTRIDGE - DIVERTER VALVE

Next: End

DHW COOL RADS COOL

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

NO CH DEMAND 1

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING 2

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 8

KIT - CUI BOARD

Next: End

NO CH DEMAND 1

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 3

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 4

KIT - CUI BOARD

Next: End

FAN RUNS CH DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

CH BOILER TEMP LOW SYSTEM TEMP LOW

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

BOILER FIRES WITH NO DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

L6 - STICKING OPEN

KIT - GAS VALVE

Next: End

L6 FAULT CODE

PCB - PRIMARY

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BLANK FOR L1 FAULT CODE 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

L1 OR L3 FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

L1 OR L3 FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

FAULT CODE L3

KIT - HEAT ENGINE

Next: End

OUT OF CALIBRATION OVERHEAT (WONT RESET)

THERMISTOR - NO FLOW

Next: End

OUT OF CALIBRATION OVERHEAT

THERMISTOR - NO FLOW

Next: End

NO VOLTAGE TO DIVERTER (QADAI)

PCB - PRIMARY

Next: End

INCORRECT RESISTANCE (QADAI)

VALVE HEAD - DIVERTER

Next: End

NO VOLTAGE TO SPARK GEN (QADAI)

PCB - PRIMARY

Next: End

INCORRECT RESISTANCE (QADAI)

UNIT - IGNITOR

Next: End

NO FAN AT START UP QADAI

PCB - PRIMARY

Next: End

TO FAN POWER - PUMP SHORT TIME START UP QADAI

HARNESS - MAINS VOLTAGE

Next: End

INCORRECT RESISTANCE (QADAI)

KIT - FAN

Next: End

NO POWER TO PUMP (QADAI)

PCB - PRIMARY

Next: End

INCORRECT RESISTANCE (QADAI)

KIT - PUMP HEAD

Next: End

RESISTANCE WRONG (QADAI)

KIT - GAS VALVE

Next: End

NO POWER TO GAS VALVE (QADAI)

PCB - PRIMARY

Next: End

QADAI

THERMISTOR - NO FLOW

Next: End

OUT OF RANGE (QADAI)

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BLANK FOR QUICK ACCESS DATA AND INFORMATION

Z DIRECTION

Next: End

BLANK FOR DIAGNOSTICS LITE 2

Z DIRECTION

Next: End

QADAI

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2 QADAI

PCB - PRIMARY

Next: End

TO FLOW SWITCH - NO HOT WATER DEMAND QADAI

HARNESS - LOW VOLTAGE

Next: End

FAN DOES NOT RUN QADAI

FLOW TURBINE

Next: End

PUMP RUNS DHW DEMAND

HARNESS (MAIN) - ERP PUMP HARNESS

Next: End

NO PUMP AT STATR UP2

HARNESS - MAINS VOLTAGE

Next: End

POWER UP - PUMP DOES NOT RUN

HARNESS (MAIN) - ERP PUMP HARNESS

Next: End

POWER UP - PUMP DOES NOT RUN NO PUMP AT STATR UP2

HARNESS - MAINS VOLTAGE

Next: End

L1

PACK - CH FLOW / PACK - RETURN CH

Next: End

L1

Next: End

NO PUMP AT START UP2 L1

PCB - PRIMARY

Next: End

NO PUMP AT STATR UP2 L1

HARNESS - MAINS VOLTAGE

Next: End

INCORRECT RESISTANCE ERP (QADAI)

KIT - PUMP HEAD

Next: End

L1

HARNESS (MAIN) - ERP PUMP HARNESS

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

KIT - FAN

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

VALVE HEAD - DIVERTER

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

KIT - GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

UNIT - IGNITOR

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

KIT - PUMP HEAD

Next: End

NO WATER FLOW THERMSITOR FAULT

THERMISTOR - NO FLOW

Next: End

OPERATION CH - UP TO TEMP RADS COLD

SYSTEM PRESSURE

Next: End

OPERATION CH - UP TO TEMP RADS COLD

KIT - PRESSURE GAUGE

Next: End

OPERATION CH - UP TO TEMP RADS COLD

PACK - CH FLOW / PACK - RETURN CH

Next: End

OPERATION CH - UP TO TEMP RADS COLD

Next: End

BOILER TO TEMP RADS COOL

KIT - PUMP HEAD

Next: End

RADS COLD BOILER HOT

CARTRIDGE - DIVERTER VALVE

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILER HOT RADS COLD

KIT - CUI BOARD

Next: End

RADS COLD BOILER HOT

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT

HARNESS - MAINS VOLTAGE

Next: End

BLANK FOR XSOL MODEL VERSION

Z DIRECTION

Next: End

POOR FLOW RATE

PACK - DHW

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

TO SPARK GEN - NO SPARK

HARNESS - MAINS VOLTAGE

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

PCB - PRIMARY

Next: End

NOT SPARKING

LEAD - IGNITION

Next: End

LOW AT START UP

SYSTEM PRESSURE

Next: End

MECHANICAL PHYSICAL OPERATION

KIT - FAN

Next: End

NEW MODEL FLUEWAYS

KIT - HEAT ENGINE

Next: End

UNDER PRESSURE

KIT - EXPANSION VESSEL

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS PRESSURE INLET

Next: End

HOT WATER CYCLING

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

HOT WATER CYCLING

KIT - PLATE HEAT EXCHANGER

Next: End

TEMPERATURE CONTROL DHW

KIT - CUI BOARD

Next: End

OPERATION CH TOO LONG FOR REFIRECIRCULATION

Next: End

BLOCKED PREHEAT SAT3

KIT - PLATE HEAT EXCHANGER

Next: End

NO DISPLAY AT START UP

HARNESS - CUI TO PRIMARY

Next: End

HOT WATER CYCLING

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

NO FAN AT START UP

HARNESS - LOW VOLTAGE

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

EXTERNAL FROST PROTECT

Next: End

NO OVERRUNS

PCB - PRIMARY

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PREHEAT SATISFACTORY3

VALVE HEAD - DIVERTER

Next: End

LOW WATER FAULT

PCB - PRIMARY

Next: End

LOW WATER ON START UP

TRANSDUCER - WATER PRESSURE

Next: End

F1 - LOW WATER FAULT

PCB - PRIMARY

Next: End

F1 - LOW WATER FAULT

TRANSDUCER - WATER PRESSURE (BLOCKED)

Next: End

TO FLOW SENSOR F4 - FLOW SENSOR FAULT

HARNESS - LOW VOLTAGE

Next: End

F4 - FLOW SENSOR FAULT

PCB - PRIMARY

Next: End

TO RETURN SENSOR F5 - RETURN SENSOR FAULT

HARNESS - LOW VOLTAGE

Next: End

F5 - RETURN SENSOR FAULT

PCB - PRIMARY

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB - PRIMARY

Next: End

C2 BCC ERROR

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO MAINS TO FAN AT START UP

PCB - PRIMARY

Next: End

ELECTRICAL OVER 15V ON N

KIT - FAN

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

SUPPLY FAULT AT POWER UP

Next: End

DHW NOISY KETTLING

KIT - PLATE HEAT EXCHANGER

Next: End

CH OPERATION NOISEY

Next: End

CH OPERATION NOISY

KIT - HEAT ENGINE

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

KIT - SIPHON TRAP

Next: End

LETBY PREHEAT3

CARTRIDGE - DIVERTER VALVE (PASSING)

Next: End

FALSE LOW VOLTAGE

PCB - PRIMARY

Next: End

L5 - RESTART FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE FA

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE FA - FLOW SENSOR

HARNESS - LOW VOLTAGE

Next: End

POWER OK PCB DEAD

PCB - PRIMARY

Next: End

INTEGRAL FUSE FATIGUED

PCB - PRIMARY

Next: End

POOR FLOW - RESTRICTED

KIT - PLATE HEAT EXCHANGER

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

SPARKING BUT NOT LIGHTING

ELECTRODE - IGNITION

Next: End

SPARK BUT NOT LIGHTING

ELECTRODE - IGNITION (SPARK GAP)

Next: End

BURNER DOES NOT IGNITE

KIT - GAS VALVE

Next: End

VOLTAGE TO GAS VALVE

PCB - PRIMARY

Next: End

SPARK BUT NOT LIGHTING

KIT - GAS VALVE

Next: End

PUMP RUNS

DHW INLET FILTER

Next: End

SENSOR PRIMARY FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

FAN DOES NOT RUN DHW

PCB - PRIMARY

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - SIPHON TRAP

Next: End

DHW COOL RADS COOL

KIT - PLATE HEAT EXCHANGER

Next: End

DHW COOL RADS COOL

KIT - HEAT ENGINE

Next: End

DHW COOL RADS COOL

EXTERNAL HOT WATER FAULT

Next: End

DHW COOL RADS COOL

PCB - PRIMARY

Next: End

NO FAN AT START UP

KIT - FAN

Next: End

IGNITES BUT BAFLLES OR NOISY

KIT - GAS VALVE

Next: End

RADS COLD BOILER HOT2

VALVE HEAD - DIVERTER

Next: End

PREHEAT SATISFACTORY4

VALVE HEAD - DIVERTER

Next: End

FAULT CODE FA

PCB - PRIMARY

Next: End

TO PUMP - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO DIVERTER - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO GASVALVE - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE F1

PCB - PRIMARY

Next: End

TO SPARK GEN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

DHW NOISY KETTLING

KIT - HEAT ENGINE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

KIT - CUI BOARD

Next: End

LOW SYSTEM TEMP POT

KIT - CUI BOARD

Next: End

NOT RESPONDING TO DEMAND

FLOW SENSOR - HALL EFFECT

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

UNIT - IGNITOR

Next: End

F2 FAULT CODE

PCB - PRIMARY

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB - PRIMARY

Next: End

NO CH DEMAND 1

Next: End

NOT RESPONDING TO CH

PCB - PRIMARY

Next: End

FAN RUNS CH DEMAND 2

Next: End

NO CH DEMAND 3

Next: End

NOT RESPONDING TO CH 2

PCB - PRIMARY

Next: End

DOES NOT RECOGNISE CH DEMAND 1

HARNESS INTERNAL TIMER (X1A)

Next: End

DOES NOT RECOGNISE CH DEMAND 2

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING 1

PCB - PRIMARY

Next: End

NO CH

HARNESS INTERNAL TIMER (X1A)

Next: End

FAN RUNS CH DEMAND

Next: End

NO CH 1

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING

PCB - PRIMARY

Next: End

NO SPARKING

ELECTRODE - IGNITION

Next: End

FAN RUNS CH DEMAND 1

Next: End

NO CH 2

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING 2

PCB - PRIMARY

Next: End

NO CH DEMAND

Next: End

DOES NOT RECOGNISE CH DEMAND

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO CH 1

PCB - PRIMARY

Next: End

ON WITH NO DEMAND - FROST

PCB - PRIMARY

Next: End

BLANK FOR L6 FAULT CODE RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR L1 FAULT CODE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE L3

KIT - PLATE HEAT EXCHANGER

Next: End

ALL CHECKS OK RETEST MODEL

OVERHEAT NO FAULT FOUND

Next: End

LEAKING POC

KIT - REPLACEMENT - SUMP & COVER

Next: End

LEAKING POC

MANIFOLD - FLUE

Next: End

STOPPING PRESEQ BREAKING

Z DIRECTION

Next: End

DIVERTER VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

DIVERTER RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

SPARK GENERATOR VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

SPARK GENERATOR SATISFACTORY

RESULT AS EXPECTED

Next: End

FAN SPEED CONTROL VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

FAN VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

NO MAINS TO FAN AT START UP QADAI

PCB - PRIMARY

Next: End

ELECTRICAL OVER 15V ON N QADAI

KIT - FAN

Next: End

FAN RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE SATISFACTORY

RESULT AS EXPECTED

Next: End

DHW THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

RETURN THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

FLOW THERMISTOR SATISFACTORY

RESULT AS EXPECTED

Next: End

BLANK FOR QUICK ACCESS DATA AND INFORMATION 2

Z DIRECTION

Next: End

BLANK FOR DIAGNOSICS LITE

Z DIRECTION

Next: End

NOT RESPONDING TO DEMAND QADAI

FLOW SENSOR - HALL EFFECT

Next: End

DHW FLOW TURBINE SATISFACTORY

RESULT AS EXPECTED

Next: End

PUMP RUNS DHW DEMAND ERP PUMP

KIT - PUMP HEAD

Next: End

START- UP2

KIT - PUMP HEAD

Next: End

POWER UP - PUMP DOES NOT RUN ERP PUMP

KIT - PUMP HEAD

Next: End

POWER UP - PUMP DOES NOT RUN START- UP2

KIT - PUMP HEAD

Next: End

FAULT CODE L1 ERP

KIT - PUMP HEAD

Next: End

START- UP2 L1

KIT - PUMP HEAD

Next: End

ERP PUMP RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

TO DIVERTER - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

TO GASVALVE - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

PCB - PRIMARY

Next: End

TO SPARK GEN - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

TO PUMP - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

NO WATER FLOW THERMSITOR FAULT

HARNESS - LOW VOLTAGE

Next: End

BOILER HOT RADS COLD

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT

VALVE HEAD - DIVERTER

Next: End

NO FLOW THERMISTOR FAULT

PCB - PRIMARY

Next: End

PUMP RUNS

REGULATOR - FLOW

Next: End

NO SPARKING

UNIT - IGNITOR

Next: End

EXPANSION CONNECTION

EXPANSION VESSEL PIPE

Next: End

HOT WATER CYCLING

PCB - PRIMARY

Next: End

TO RETURN SENSOR - HOT WATER CYCLING

HARNESS - LOW VOLTAGE

Next: End

TO HEATING SENSOR - HOT WATER CYCLING

HARNESS - LOW VOLTAGE

Next: End

DHW TOO HOT

PCB - PRIMARY

Next: End

LED AT POWER UP

KIT - CUI BOARD

Next: End

TO FLOW SENSOR - FROST

HARNESS - LOW VOLTAGE

Next: End

TO RETURN SENSOR - FROST

HARNESS - LOW VOLTAGE

Next: End

MIXING - HOT WATER CYCLING

EXTERNAL HOT WATER FAULT

Next: End

NO DISPLAY SEEN

CHARACTERISTIC TEST FROM POWER UP

Next: p108

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

PUMP ONLY RUNS FOR A SHORT TIME AND 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: p2282

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p1307

FAN RUNS BUT PUMP DOES NOT

CHARACTERISTIC TEST FROM POWER UP

Next: p138

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: p1595

INLET PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET (BLIP TEST)

Next: !p1564

SPARK ELECTRODE IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1586

SPARK GAP INCORRECT

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1588

DHW INLET FILTER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p161

TEMPERATURE DIFFERENTIAL EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: !p1692

DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: p2234

DIVERTER VALVE HEAD DOES NOT OPERATE CH

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p1831

DIVERTER VALVE HEAD DOES NOT OPERATE DHW

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p1836

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p571

DHW COOL RADS COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2381

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p199

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1302

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p770

SUMP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p2614

FLUE MANIFOLD UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SUMP AND FLUE MANIFOLD

Next: !p2616

DIAGNOSTICS LITE OPTION

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2628

QUICK ACCESS DATA AND INFORMATION OPTION

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2630

HEADER FOR QUICK ACCESS DATA FLOW THERMISTOR

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2632

HEADER FOR QUICK ACCESS DATA RETURN THERMISTOR

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2634

HEADER FOR QUICK ACCESS DATA NO FLOW THERMISTOR

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2636

HEADER FOR QUICK ACCESS DATA GAS VALVE VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2638

HEADER FOR QUICK ACCESS DATA GAS VALVE RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2640

HEADER FOR QUICK ACCESS DATA PUMP RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2642

HEADER FOR QUICK ACCESS DATA PUMP VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2644

HEADER FOR QUICK ACCESS DATA FAN RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2646

HEADER FOR QUICK ACCESS DATA FAN VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2648

HEADER FOR QUICK ACCESS DATA FAN SPEED CONTROL

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2650

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2654

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2656

HEADER FOR QUICK ACCESS DATA DIVERTER RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2658

HEADER FOR QUICK ACCESS DATA DIVERTER VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2660

NEEDED OR PRESEQ MESSES UP DIVERTER VOLTAGE FOR SOME REASON

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: !p2662

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p2678

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p2680

HEADER FOR DHW FLOW SWITCH

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2706

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p494

HEADER FOR QUICK ACCESS DATA PUMP RESISTANCE (ERP)

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2882

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p2051

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p292

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1399

DHW FLOW LIMITER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p34

FAN RUNS AS DESCRIBED BUT PUMP ONLY RUNS FOR A FEW SECONDS

CHARACTERISTIC TEST FROM POWER UP

Next: p522

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1322

BOILER REACHES TEMPERATURE AND/OR SHUTS DOWN RADS COLD OR COOL

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2919

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2464

OPERATION SATISFACTORY SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p643

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: p942

DISPLAY SHOWS D AND FAN RUNS BUT PUMP DOES NOT

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p981

DISPLAY SHOWS 0 AND NEITHER THE FAN NOR THE PUMP RUN

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p964

03/01/2024 09:22:20 2312_1_50_1 22/02/2024 11:15:32

16/02/2024 14:39:55

Next: End

RESISTANCE HARNESS LOW WATER PRESSURE SENSOR

DISCONNECT CONNECTOR X8 FROM THE PCB AND THE CONNECTOR FROM THE LOW WATER PRESSURE SENSOR

Next: p1080, !f1076

VOLTAGE MAINS POWER SUPPLY

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1242, f1238

INSPECTION SYSTEM PRESSURE

Next: p1942, !f1950

RESISTANCE HARNESS LOW WATER PRESSURE SENSOR

DISCONNECT CONNECTOR X8 FROM THE PCB AND THE CONNECTOR FROM THE LOW WATER PRESSURE SENSOR

Next: p1141, !f1143

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: !p1150, f1147

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p1148, !f1149

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: !p1155, f1152

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1153, !f1154

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p1193, !f1196

INFORMATION - RECENTLY REPLACED PCB

Next: !p1211, !f1208

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1247, f1239

3AMP FUSE FAULTY

Next: !p1240, !f1241

PCB FUSE FAULTY

Next: !p1245, !f1246

INSPECTION CONDENSATE PIPE

Next: !p1408, !f1409

VOLTAGE MAINS POWER SUPPLY

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p1452, !f1453

POWER OFF RESET BOILER

PREHEAT OFF
WAIT APPROXIMATELY 15 SECONDS

Next: !p1457, !f1456

PUMP LIMPET TEST

Next: p1464, !f1466

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1468, !f1469

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p1478, !f1479

INFORMATION INTEGRAL FUSE

Next: !p1487, !f1488

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR X2A (4WAY, 5TH FROM LEFT) FROM THE PCB

Next: !p1598, !f1599

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p1618, !f1619

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1622, !f1623

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1649, !f1650

INSPECTION CONDENSATE PIPE

Next: !p1653, !f1654

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p1690, ?1691, ?1693

RESET BOILER

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p1908, f2494

INSPECTION DIVERTER VALVE & ACTUATOR - FUSE INVESTIGATION

REMOVE DIVERTER VALV

Next: p2833, !f1907

RESISTANCE PUMP

UNPLUG THE HARNESS FROM THE SIDE OF THE PUMP AND REMOVE THE PUMPS ELECTRICAL COVER

Next: !p1889, !f1890

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p1893, !f1894

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p1897, !f1898

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1901, !f1902

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p1905, !f1906

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2045, !f2046

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p2088, !f2089

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2096, !f2097

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2264, f2269

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2307, !f2308

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2285, f2313

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2299, f2300

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2309, !f2310

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2325, f2336

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2346, !f2347

VOLTAGE TO DIVERTER VALVE (DHW)

PREHEAT OFF
BOILER MAINS SWITCH ON
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1018, !f1021

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2360, f2361

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2362, f2363

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2364, !f2365

INSPECTION SELECTOR SWITCH KNOB

Next: p2440, !f2463

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2443, f2444

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2445, f2446

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2447, !f2448

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2455, f2456

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2457, !f2458

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p2495, !f2496

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p2608, !f2609

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2709, !f2710

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2731, !f2732

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2738, !f2739

SERVICE VALVE

Next: p1489, !f30

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: p2825, !f2826

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2829, !f2885

RESISTANCE PUMP AND HARNESS (ERP)

GAIN ACCESS TO PCB
DISCONNECT PLUG X1C FROM PCB (3 WAY PLUG 3RD FROM LEFT)

Next: p2889, f2890

RESISTANCE PUMP (ERP)

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

Next: !p2912, !f2911

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2895, !f2896

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p2899, !f2900

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p2903, !f2904

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2907, !f2908

RESISTANCE NO FLOW SENSOR AND HARNESS

DISCONNECT PLUG X8 FROM PCB

Next: !p2946, f2916

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p2917, !f2918

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p2932, !f2933

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p496, !f504

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p782, !f788

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p787, !f848

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p784, !f785

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p946, !f956

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p950, !f951

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p1019, !f1261

FAN AND PUMP RUN ON START UP

{ALLDEMANDOFF}
PREHEAT OFF

Next: p835, f1088

INSPECT LOW WATER PRESSURE SENSOR (BLOCKAGE)

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

Next: !p1081, !f1082

VOLTAGE SENSOR LOW WATER PRESSURE (AT PCB)

PREHEAT OFF
ENSUR

Next: !p1139, f1140

INSPECT LOW WATER PRESSURE SENSOR (BLOCKAGE)

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

Next: !p1144, !f1145

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2478, !f1195

RESISTANCE HARNESS FAN POWER

GAIN ACCESS TO PCB
REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X3

Next: !p1236, !f1235

PCB FUSE RESISTANCE

REMOVE 4 AMP FUSE FROM PCB

Next: p1484, f1244

MAINS VOLTAGE TO FAN FROM PCB

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

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 TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: !p1319, !f1320

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p1308, !f1309

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2029, !f2032

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

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p1328, !f1329

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2033, !f2036

FAN CONTROL VOLTAGE FROM PCB

REMOVE DC ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE
PREHEAT OFF

Next: p134, !f137

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p1337, !f1338

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2193, !f2199

RESISTANCE HARNESS FAN CONTROL

REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X8

Next: p1719, !f852

VOLTAGE PUMP AT PCB START-UP

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p2735, !f1200

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1502, f1407

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p1465, f1467

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p1860, f1477

RESISTANCE PCB INTEGRAL FUSE

DISCONNECT ALL CONNECTORS FROM THE PCB
REMOVE AND FLIP THE PCB ONTO ITS BACK

Next: !p1485, f1486

OBSERVATION COLD WATER SUPPLY

Next: p29, !f1498

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1728, !f1510

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1559, !f1593

PRESSURE GAS INLET (BLIP TEST)

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1560, ?1561, ?1563

INSPECTION BURNER

REMOVE THE BURNER

Next: p1581, !f1582

INSPECTION ELECTRODE SPARK GAP

CAREFULLY REMOVE BURNER FROM BOILER

Next: p1583, ?1585, ?1587

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1589, !f1590

INSPECTION FLUE

Next: !p1591, !f1592

VOLTAGE GAS VALVE (AT GAS VALVE)

PREHEAT SWITCHED OFF

Next: p1596, f1597

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: p1600, !f1601

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1602, !f1603

INSPECTION BURNER

REMOVE THE BURNER

Next: p1604, !f1605

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1606, !f1607

INSPECTION FLUE

Next: !p1608, !f1609

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p1616, f1617

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p2376, f1621

VOLTAGE ON/OFF SWITCH

SELECTOR SWITCH SET TO HOT WATER POSITION
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED

Next: !p1624, !f1625

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p1640, !f1641

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p1662, !f1643

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1646, !f1647

GAS RATE

Next: !p1708, f1648

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1710, f1652

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p2183, !f2191

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1657, !f1658

INSPECTION FLUE

Next: !p1709, !f1660

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p1645, f1689

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: p1651, !f1718

RESISTANCE HARNESS FAN POWER

GAIN ACCESS TO PCB
REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X3

Next: !p1720, !f1722

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1741, !f1727

INSPECTION FLUE

Next: p626, !f1738

OBSERVATION PUMP RUNS

Next: p1779, f2824

PUMP LIMPET TEST

Next: p2606, !f1784

INSPECTION DIVERTER VALVE HEAD OPERATION

SELECTOR SWITCH SET

Next: p1841, ?1827, ?1829

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p1832, !f1833

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p1834, !f1835

VOLTAGE TO DIVERTER VALVE (DHW)

PREHEAT OFF
BOILER MAINS SWITCH ON
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1837, !f1838

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p1839, !f1840

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p1778, !f1859

INSPECTION DIVERTER VALVE CARTRIDGE AND WATERWAYS

DRAIN PRIMARY SYSTEM

Next: !p1861, !f1862

RESISTANCE PUMP AND HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X1C FROM PCB (3 WAY PLUG 3RD FROM LEFT)

Next: p1887, f1888

RESISTANCE FAN AND HARNESS (MAINS POWER)

GAIN ACCESS TO PCB
REMOVE X3 CONNECTOR FROM THE PCB

Next: p1891, f1892

RESISTANCE HARNESS AND DIVERTER VALVE ACTUATOR

REMOVE X1D CONNECTOR (4TH FROM LEFT) FROM THE PCB

Next: p1895, f1896

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR X2A (4WAY, 5TH FROM LEFT) FROM THE PCB

Next: p1899, f1900

RESISTANCE HARNESS AND SPARK GENERATOR

REMOVE CONNECTOR X2B FROM THE PCB
(5WAY CONNECTOR 6TH FROM THE LEFT)

Next: !p1903, f1904

INSPECTION SYSTEM PRESSURE

Next: p1952, !f1985

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p1138, !f1951

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p2742, !f1986

INSPECTION BURNER

REMOVE THE BURNER

Next: p1655, !f1994

INSPECTION DIVERTER VALVE HEAD DHW POSITION

PREHEAT OFF
UNCLIP AND REMOVE HEAD FROM DIVERTER VALVE AND PLACE IN A SAFE POSITION

Next: p234, f235

PUMP LIMPET TEST

Next: !p2030, !f2031

PUMP LIMPET TEST

Next: !p2034, !f2035

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p2039, !f2040

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p2041, !f2042

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR

Next: p2047, !f2048

INSPECTION FLOW TURBINE

ISOLATE AND DRAIN TH

Next: !p2049, !f2050

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: p1558, f2087

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE BOTH ENDS OF

Next: p2090, !f2091

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p2092, !f2093

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p2098, !f2099

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2135, !f2147

INSPECTION BURNER

REMOVE THE BURNER

Next: p2150, !f2155

INSPECTION FLUE

Next: !p2104, !f2105

INSPECTION BURNER

REMOVE THE BURNER

Next: p2370, !f2133

INSPECTION FLUE

Next: !p2131, !f2132

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p2141, !f2148

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p2171, !f2181

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p2165, !f2170

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p524, !f2164

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2102, !f2169

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p2100, !f2182

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p1987, !f2192

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p2123, !f2200

OBSERVATION INTERNAL TIMER

Next: p2235, f2359

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2249, f2250

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2265, !f2266

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2267, !f2268

OBSERVATION INTERNAL TIMER

Next: p2283, f2284

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2297, f2298

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2303, !f2304

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2305, !f2306

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2326, !f2327

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2328, !f2329

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p240, !f241

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2366, !f2367

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2368, !f2369

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2130, !f2374

INSPECTION SELECTOR SWITCH KNOB

Next: p1620, !f2380

INSPECTION DHW CONTROL KNOB

Next: p1639, !f2438

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p1422, !f812

OBSERVATION INTERNAL TIMER

Next: p2441, f2442

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2453, f2454

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2449, !f2450

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2451, !f2452

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2459, !f2460

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2461, !f2462

INSPECTION CH CONTROL KNOB

Next: p639, !f2474

INSPECTION PREHEAT KNOB

Next: !p2476, !f2477

TIGHTNESS TEST INSTALLATION

Next: p2479, !f2480

OBSERVATION FAULT CODE RESET (L6)

Next: !p2482, !f2484

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2617, !f2498

INFORMATION - RECENTLY REPLACED PCB

Next: !p2499, !f2500

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p2534, !f2600

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2567, !f2601

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p1807, !f2623

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p2610, f2607

INSPECTION SUMP AND FLUE MANIFOLD

REMOVE SUMP INSPECTION COVER

Next: !p2611, ?2613, ?2615

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2497, !f2621

DIAGNOSTICS LITE

DIAGNOSIS RELIES ON

Next: !p2701, !f2702

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW

Next: !p2699, !f2700

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: !p2697, !f2698

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p2695, !f2703

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: !p2693, !f2694

VOLTAGE GAS VALVE (AT GAS VALVE)

PREHEAT SWITCHED OFF

Next: !p2691, !f2692

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p2689, !f2690

RESISTANCE PUMP

UNPLUG THE HARNESS FROM THE SIDE OF THE PUMP AND REMOVE THE PUMPS ELECTRICAL COVER

Next: !p2687, !f2688

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: !p2685, !f2686

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2683, !f2684

MAINS VOLTAGE TO FAN FROM PCB

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p2675, ?2677, ?2679

FAN CONTROL VOLTAGE FROM PCB

REMOVE DC ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE
PREHEAT OFF

Next: !p2673, !f2674

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2669, !f2670

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p2667, !f2668

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p2665, !f2666

VOLTAGE DIVERTER VALVE AT PCB (QADAI)

PREHEAT OFF
BOILE

Next: !p2663, !f2664

RESISTANCE HARNESS FAN POWER

GAIN ACCESS TO PCB
REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X3

Next: !p2681, !f2682

VOLTAGE FROM HOT WATER FLOW TURBINE

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)
RUN HOT WATER TAP AT 3 L/MIN

Next: !p2727, f2708

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR

Next: p2711, !f2712

INSPECTION FLOW TURBINE

ISOLATE AND DRAIN TH

Next: !p2713, !f2714

OBSERVATION PUMP TYPE

Next: p2729, f2730

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2733, !f2734

OBSERVATION PUMP TYPE

Next: p2736, f2737

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2740, !f2741

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2782, !f2822

INSPECTION EXTERNAL BYPASS

Next: p2501, !f2823

OBSERVATION PUMP TYPE

Next: p2827, f2828

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2831, !f2832

OBSERVATION PUMP TYPE

Next: p1886, f2888

RESISTANCE PUMP (ERP)

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

Next: !p2883, !f2884

RESISTANCE FAN AND HARNESS (MAINS POWER)

GAIN ACCESS TO PCB
REMOVE X3 CONNECTOR FROM THE PCB

Next: p2893, f2894

RESISTANCE HARNESS AND DIVERTER VALVE ACTUATOR

REMOVE X1D CONNECTOR (4TH FROM LEFT) FROM THE PCB

Next: p2897, f2898

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR X2A (4WAY, 5TH FROM LEFT) FROM THE PCB

Next: p2901, f2902

INSPECTION FILTER DHW INLET

ISOLATE MAINS WATER SUPPLY

Next: !p1501, ?33, ?160

RESISTANCE HARNESS AND SPARK GENERATOR

REMOVE CONNECTOR X2B FROM THE PCB
(5WAY CONNECTOR 6TH FROM THE LEFT)

Next: !p2905, f2906

INSPECTION SYSTEM PRESSURE

Next: p2920, !f2921

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1336, !f308

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p2922, !f2923

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2924, !f2925

INSPECTION EXTERNAL BYPASS

Next: p2926, !f2927

PUMP LIMPET TEST

Next: p2928, !f2929

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

PREHEAT OFF
UNCLIP AND REMOVE HEAD FROM DIVERTER VALVE AND PLACE IN A SAFE POSITION

Next: p2930, f2931

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p2942, !f2943

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: p2934, !f2935

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p2936, !f2937

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2938, !f2939

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2940, !f2941

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p2944, !f2945

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: !p2375, f495

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE BOTH ENDS OF

Next: p505, !f502

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p506, !f507

INSPECTION SYSTEM PRESSURE

Next: p2156, !f523

VOLTAGE SENSOR LOW WATER PRESSURE (AT PCB)

PREHEAT OFF
ENSUR

Next: !p1079, f1074

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p838, !f998

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: !p793, !f792

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p627, !f628

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1723, !f630

GAS INLET PRESSURE

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p660, !f661

SWITCHED LIVE VOLTAGE INPUT

PREHEAT OFF
BOILERS HEATING TEMPERATURE CONTROL TO OFF POSITION

Next: p648, !f649

EXPANSION VESSEL PRESSURE

SYSTEM PRESSURE DISCHARGED

Next: !p646, !f647

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: p869, !f811

GAS RATE

Next: p2038, !f2043

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p771, f776

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p772, f779

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: !p994, f783

INSPECTION RIBBON CABLE

GAIN ACCESS TO PCB
REMOVE THE RIBBON CABLE JOINING THE TWO PCB'S

Next: !p836, !f837

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p572, !f997

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PINK AND BLACK LEADS, LEFT SIDE ABOVE DIVERTER) FROM FLOW SENSOR

Next: p873, !f1014

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1204, !f1012

VOLTAGE EXTERNAL FROST STAT

{ALLDEMANDOFF}
PREHEAT OFF
GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: p944, !f957

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p948, f945

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p2475, f949

VOLTAGE FROM HOT WATER FLOW TURBINE

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)
RUN HOT WATER TAP AT 3 L/MIN

Next: p1615, f2044

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: p2728, !f1201

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