XSol Diagnostic System

IDEAL I-MINI AND LOGIC COMBI ZH TO ABK (BRASS HYDROBLOCK - 2 THERMISTORS)

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &3, !f1228

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f1227

POWER ON SELF TEST

{ALLDEMANDOFF}
PR

Next: &1500, ?106, ?129, ?131, ?521, ?940

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

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

OPERATIONAL SEQUENCE

NO LONGER USED

Next: &nff, !f1084

FAULT CODES

Next: &nff, !f1086

L1

OK TO BE BLANK

Next: &nff, f2175

F1

OK TO BE BLANK

Next: &nff, f1137

F4

OK TO BE BLANK

Next: &nff, f1146

F5

OK TO BE BLANK

Next: &nff, f1151

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, f2126

FURTHER INVESTIGATION FUSES

OK TO BE BLANK

Next: &nff, f1714

F7

OK TO BE BLANK

Next: &nff, f1451

L5

OK TO BE BLANK

Next: &nff, f1455

FA

OK TO BE BLANK

Next: &nff, f1463

DHW FLOW RATE

Next: &39, f1501

F2

OK TO BE BLANK

Next: &nff, f1962

L6

OK TO BE BLANK

Next: &nff, f2160

NEW QADAI OPTIONS

INTENTIONALLY BLANK HEADER

Next: &nff, ?2264, ?2266, ?2268, ?2270, ?2274, ?2276, ?2278, ?2280, ?2282, ?2284, ?2286, ?2290, ?2292, ?2294, ?2296, ?2298, ?2300, ?2562

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

OPERATION CH OK NO REFIRE

THERMISTOR - CONTROL - RETURN

Next: End

OPERATION CH OK NO REFIRE

THERMISTOR - NO FLOW

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

OPS SEQ

Z DIRECTION CHOICE OR CONTINUE

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 - NO FLOW

Next: End

F5 - RETURN SENSOR FAULT

THERMISTOR - CONTROL - RETURN

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 - 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 - PRIMARY

Next: End

POOR VOLTAGE

Next: End

WONT RESET L5

PCB - PRIMARY

Next: End

FA

KIT - PUMP HEAD

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - RETURN

Next: End

FAULT CODE FA

THERMISTOR - NO FLOW

Next: End

PCB DAMAGED

PCB - PRIMARY AND LEAK OR SHORT

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

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

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 RUNS DHW

THERMISTOR - NO FLOW

Next: End

SENSOR TEMP RETURN FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

DHW POT FAULTY

CUI BOARD

Next: End

FAN DOES NOT RUN

HARNESS - MAINS VOLTAGE

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CONDENSATE PIPE

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

FUSE FURTHER INVESTIGATION

VALVE HEAD DIVERTER - CARTRIDGE DIVERTER

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

F1 - LOW WATER FAULT

SYSTEM PRESSURE

Next: End

F1 FAULT CODE

PRESSURE GAUGE

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 - PRIMARY

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS - MAINS VOLTAGE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

LEAD - IGNITION

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

PUMP ONLY RUNS FOR A FEW SECS

PRESSURE GAUGE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

BURNERIGNITES

HARNESS - DETECTION LEAD

Next: End

BURNER IGNITES

ELECTRODE - DETECTION

Next: End

GAS VALVE INLET FILTER RESTRICTED

KIT - GAS VALVE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

KIT - BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

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

RESTICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

CONDENSATE PIPE

Next: End

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

CUI BOARD

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

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

GAS PRESSURE INLET

Next: End

F2 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

F2 FAULT CODE

ELECTRODE - DETECTION

Next: End

F2 FAULT CODE

KIT - SIPHON TRAP

Next: End

F2 FAULT CODE

INJECTOR ASSEMBLY

Next: End

F2 FAULT CODE

KIT - GAS VALVE

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

NO CH DEMAND

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING

CUI BOARD

Next: End

NOT RESPONDING TO CH

CUI BOARD

Next: End

NO CH DEMAND

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 1

CUI BOARD

Next: End

NOT RESPONDING TO CH 2

CUI BOARD

Next: End

NO CH DEMAND 2

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING 1

CUI BOARD

Next: End

NOT RESPONDING TO CH 7

CUI BOARD

Next: End

NO CH DEMAND 2

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 5

CUI BOARD

Next: End

NOT RESPONDING TO CH 6

CUI BOARD

Next: End

DOES NOT ESTABLISH

ELECTRODE - IGNITION

Next: End

CH BOILER TEMP LOW SYSTEM TEMP LOW

KNOB - WHITE / GREY - POTENTIOMETERS

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

CUI BOARD

Next: End

NOT RESPONDING TO CH 8

CUI BOARD

Next: End

NO CH DEMAND 1

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 3

CUI BOARD

Next: End

NOT RESPONDING TO CH 4

CUI BOARD

Next: End

FAN RUNS CH DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

FAN RUNS DHW DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

BOILER FIRES WITH NO DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

L6 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

L6 FAULT CODE

ELECTRODE - DETECTION

Next: End

L6 - STICKING OPEN

KIT - GAS VALVE

Next: End

L6 FAULT CODE

PCB - PRIMARY

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - NO FLOW

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - RETURN

Next: End

FAULT CODE L3

SYSTEM PRESSURE

Next: End

L3 NO WATER FLOW

PRESSURE GAUGE

Next: End

L1 OR L3 FAULT

THERMISTOR - NO FLOW

Next: End

L1 OR L3 FAULT

THERMISTOR - CONTROL - RETURN

Next: End

BLANK FOR L1 FAULT CODE 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

PREHEAT SATISFACTORY4

PCB - PRIMARY

Next: End

TO DIVERTER - RADS NOT POOR HOT WATER2

HARNESS - MAINS VOLTAGE

Next: End

RADS COLD BOILER HOT 2

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT2

HARNESS - MAINS VOLTAGE

Next: End

FAULT CODE L3

CARTRIDGE - DIVERTER VALVE

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

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 - CONTROL - RETURN

Next: End

OUT OF RANGE (QADAI)

THERMISTOR - NO FLOW

Next: End

BLANK FOR QUICK ACCESS DATA AND INFORMATION

Z DIRECTION

Next: End

BLANK FOR DIAGNOSTICS LITE 2

Z DIRECTION

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

PUMP RUNS DHW DEMAND

HARNESS (MAIN) - ERP PUMP HARNESS

Next: End

NO PUMP AT STATR UP2

HARNESS - MAINS VOLTAGE

Next: End

FO-L3 - NO FLOW FAULT - STICKING

KIT - PUMP HEAD

Next: End

FAULT CODE L3

HEAT ENGINE

Next: End

PREHEAT SATISFACTORY3

CARTRIDGE - DIVERTER VALVE

Next: End

L1

HARNESS (MAIN) - ERP PUMP HARNESS

Next: End

NO PUMP AT STATR UP2 L1

HARNESS - MAINS VOLTAGE

Next: End

NO VOLTAGE TO PUMP L1

PCB - PRIMARY

Next: End

L1

Next: End

L1

PACK - CH FLOW / PACK - RETURN CH

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

INCORRECT RESISTANCE ERP (QADAI)

KIT - PUMP HEAD

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

KIT - PUMP HEAD

Next: End

OPERATION CH - UP TO TEMP RADS COLD

SYSTEM PRESSURE

Next: End

OPERATION CH - UP TO TEMP RADS COLD

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 - NO FLOW

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - RETURN

Next: End

BOILER HOT RADS COLD

CUI BOARD

Next: End

RADS COLD BOILER HOT

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT

HARNESS - MAINS VOLTAGE

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

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 - RETURN

Next: End

HOT WATER CYCLING

KIT - PLATE HEAT EXCHANGER

Next: End

TEMPERATURE CONTROL DHW

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 - NO FLOW

Next: End

NO FAN AT START UP

HARNESS - LOW VOLTAGE

Next: End

LOW GAS RATE CH OPERATION

INJECTOR ASSEMBLY

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - CONTROL - RETURN

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - NO FLOW

Next: End

EXTERNAL FROST PROTECT

Next: End

NO OVERRUNS

PCB - PRIMARY

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - RETURN

Next: End

HOT WATER TOO HOT

THERMISTOR - NO FLOW

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

HEAT ENGINE

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

FAULT CODE FA

PCB - PRIMARY

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

PUMP RUNS

REGULATOR - FLOW

Next: End

PUMP RUNS

DHW INLET FILTER

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

VOLTAGE TO GAS VALVE

PCB - PRIMARY

Next: End

SPARK BUT NOT LIGHTING

KIT - GAS VALVE

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

SENSOR PRIMARY FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - RETURN

Next: End

FAN DOES NOT RUN DHW

PCB - PRIMARY

Next: End

NO FAN AT START UP

KIT - FAN

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

KIT - SIPHON TRAP

Next: End

IGNITES BUT BAFLLES OR NOISY

KIT - GAS VALVE

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

HEAT ENGINE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

CUI BOARD

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

UNIT - IGNITOR

Next: End

NOT RESPONDING TO DEMAND

FLOW SENSOR - HALL EFFECT

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB - PRIMARY

Next: End

DHW COOL RADS COOL

KIT - PLATE HEAT EXCHANGER

Next: End

DHW COOL RADS COOL

HEAT ENGINE

Next: End

DHW COOL RADS COOL

EXTERNAL HOT WATER FAULT

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - SIPHON TRAP

Next: End

DHW COOL RADS COOL

PCB - PRIMARY

Next: End

F2 FAULT CODE

PCB - PRIMARY

Next: End

FAN RUNS CH DEMAND

Next: End

NO CH 1

HARNESS INTERNAL TIMER

Next: End

NOT RESPONDING TO HEATING

PCB - PRIMARY

Next: End

NO CH DEMAND 1

Next: End

DOES NOT RECOGNISE CH DEMAND 1

HARNESS INTERNAL TIMER

Next: End

NOT RESPONDING TO CH

PCB - PRIMARY

Next: End

FAN RUNS CH DEMAND 2

Next: End

NO CH

HARNESS INTERNAL TIMER

Next: End

NOT RESPONDING TO HEATING 1

PCB - PRIMARY

Next: End

NO CH DEMAND 3

Next: End

DOES NOT RECOGNISE CH DEMAND 2

HARNESS INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 2

PCB - PRIMARY

Next: End

FAN RUNS CH DEMAND 1

Next: End

NO CH 2

HARNESS INTERNAL TIMER

Next: End

NOT RESPONDING TO HEATING 2

PCB - PRIMARY

Next: End

NO CH DEMAND

Next: End

DOES NOT RECOGNISE CH DEMAND

HARNESS INTERNAL TIMER

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

PREHEAT SATISFACTORY4

VALVE HEAD - DIVERTER

Next: End

RADS COLD BOILER HOT2

VALVE HEAD - DIVERTER

Next: End

STOPPING PRESEQ BREAKING

Z DIRECTION

Next: End

DHW FLOW TURBINE SATISFACTORY

RESULT AS EXPECTED

Next: End

NOT RESPONDING TO DEMAND QADAI

FLOW SENSOR - HALL EFFECT

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

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

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

PUMP RUNS DHW DEMAND ERP PUMP

KIT - PUMP HEAD

Next: End

START- UP2

KIT - PUMP HEAD

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

FAULT CODE L1 ERP

KIT - PUMP HEAD

Next: End

START- UP2 L1

KIT - PUMP HEAD

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

ERP PUMP RESISTANCE SATISFACTORY

RESULT AS EXPECTED

Next: End

TO PUMP - FURTHER INVESTIGATION FUSE F1 ERP PUMP

HARNESS - MAINS VOLTAGE

Next: End

BOILER HOT RADS COLD

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT

VALVE HEAD - DIVERTER

Next: End

NO SPARKING

UNIT - IGNITOR

Next: End

POOR CONDITION - NO SPARK

ELECTRODE - IGNITION

Next: End

EXPANSION CONNECTION

SYSTEM BLOCKAGES

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

CUI BOARD

Next: End

LOW SYSTEM TEMP POT

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: p2006

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

DHW FLOW LIMITER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p1509

DHW INLET FILTER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p1511

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 TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: !p1863

DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: p1983

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p571

DHW COOL RADS COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2068

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

DIVERTER VALVE HEAD DOES NOT OPERATE CH

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p2234

DIVERTER VALVE HEAD DOES NOT OPERATE DHW

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p2236

DIAGNOSTICS LITE OPTION

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2265

QUICK ACCESS DATA AND INFORMATION OPTION

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2267

HEADER FOR QUICK ACCESS DATA FLOW THERMISTOR

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2269

HEADER FOR QUICK ACCESS DATA RETURN THERMISTOR

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2271

HEADER FOR QUICK ACCESS DATA GAS VALVE VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2275

HEADER FOR QUICK ACCESS DATA GAS VALVE RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2277

HEADER FOR QUICK ACCESS DATA PUMP RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2279

HEADER FOR QUICK ACCESS DATA PUMP VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2281

HEADER FOR QUICK ACCESS DATA FAN RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2283

HEADER FOR QUICK ACCESS DATA FAN VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2285

HEADER FOR QUICK ACCESS DATA FAN SPEED CONTROL

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2287

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2291

HEADER FOR QUICK ACCESS DATA SPARK GENERATOR VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2293

HEADER FOR QUICK ACCESS DATA DIVERTER RESISTANCE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2295

HEADER FOR QUICK ACCESS DATA DIVERTER VOLTAGE

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2297

NEEDED OR PRESEQ MESSES UP DIVERTER VOLTAGE FOR SOME REASON

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: !p2299

HEADER FOR DHW FLOW SWITCH

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2301

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p2325

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p2327

SUMP UNSATISFACTORY

Next: !p2411

FLUE MANIFOLD UNSATISFACTORY

Next: !p2413

HEADER FOR QUICK ACCESS DATA PUMP RESISTANCE (ERP)

CHARACTERISTIC TEST FROM NEW QADAI OPTIONS

Next: p2563

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

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1841

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1678

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: p2568

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2057

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: p1609

15/01/2024 16:00:45 2305_3_50_1 22/02/2024 11:18:55

14/02/2024 14:26:17

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: p1737, !f1745

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

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

Next: !p1150, f1147

FLOW SENSOR RESISTANCE

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

Next: !p1148, !f1149

RETURN SENSOR RESISTANCE THROUGH HARNESS

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

Next: !p1155, f1152

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1153, !f1154

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

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

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

Next: !p1478, !f1479

INFORMATION INTEGRAL FUSE

Next: !p1498, !f1499

SERVICE VALVE

Next: p1502, !f1503

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB (

Next: !p1566, !f1567

FLOW SENSOR RESISTANCE

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

Next: !p1625, !f1626

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1629, !f1630

INSPECTION CONDENSATE PIPE

Next: !p1681, !f1682

INSPECTION DIVERTER VALVE & ACTUATOR - FUSE INVESTIGATION

REMOVE DIVERTER VALV

Next: p2512, !f1716

RESISTANCE PUMP

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

Next: !p1719, !f1720

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p1723, !f1724

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p1727, !f1728

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1731, !f1732

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p1735, !f1736

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

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

Next: p1801, !f1802

VOLTAGE TO FLOW SWITCH TURBINE

Next: p1826, !f1827

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p1861, ?1862, ?1864

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1894, !f1895

INSPECTION CONDENSATE PIPE

Next: !p1898, !f1899

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1963, !f1964

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p1986, f1987

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p1988, f1989

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p1990, !f1991

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

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

Next: p1998, f1999

RESISTANCE INTERNAL TIMER

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

Next: !p2000, !f2001

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2009, f2010

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2011, f2012

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2013, !f2014

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

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

Next: p2021, f2022

RESISTANCE INTERNAL TIMER

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

Next: !p2023, !f2024

INSPECTION SELECTOR SWITCH KNOB

Next: p2127, !f2150

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2130, f2131

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2132, f2133

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2134, !f2135

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

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

Next: p2142, f2143

RESISTANCE INTERNAL TIMER

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

Next: !p2144, !f2145

RESISTANCE ELECTRODE SENSE HARNESS

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

Next: p2161, !f2162

RESET BOILER

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p2176, f2177

FLOW SENSOR RESISTANCE

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

Next: p2178, !f2179

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2304, !f2305

VOLTAGE TO DIVERTER VALVE (DHW)

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

Next: p1018, !f1021

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2353, !f2354

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2360, !f2361

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: p2414, !f2421

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p2406, !f2407

RESISTANCE PUMP HARNESS (ERP)

DISCONNECT MAINS VOL

Next: !p2417, !f2418

RESISTANCE PUMP AND HARNESS (ERP)

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

Next: p2542, f2543

RESISTANCE PUMP (ERP)

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

Next: !p2566, !f2567

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2548, !f2549

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p2552, !f2553

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p2556, !f2557

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2560, !f2561

INSPECTION DIVERTER VALVE SPINDLE

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

Next: p2581, !f2582

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

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

Next: !p787, !f848

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p784, !f785

FLOW SENSOR RESISTANCE

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

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

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: p1495, f1244

MAINS VOLTAGE TO FAN FROM PCB

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

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

Next: p1308, !f1309

RETURN SENSOR RESISTANCE

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

FLOW SENSOR RESISTANCE

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

Next: p1328, !f1329

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p1759, !f1762

FAN CONTROL VOLTAGE FROM PCB

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

Next: p134, !f137

RESISTANCE HARNESS FAN CONTROL

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

Next: p1675, !f852

VOLTAGE PUMP AT PCB START-UP

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

Next: p2350, !f1200

RETURN SENSOR RESISTANCE THROUGH HARNESS

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

Next: p1465, f1467

FLOW SENSOR RESISTANCE THROUGH HARNESS

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

Next: !p1480, f1477

RESISTANCE PCB INTEGRAL FUSE

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

Next: !p1496, f1497

OBSERVATION COLD WATER SUPPLY

Next: p1504, !f1505

INSPECTION FILTER DHW INLET

ISOLATE MAINS WATER SUPPLY

Next: !p1506, ?1508, ?1510

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER.

Next: p1556, !f1557

PRESSURE GAS INLET (BLIP TEST)

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1558, ?1560, ?1562

INSPECTION BURNER

REMOVE THE BURNER

Next: p1578, !f1579

VOLTAGE GAS VALVE (AT GAS VALVE)

PREHEAT SWITCHED OFF

Next: p1564, f1565

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: p1568, !f1569

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

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: p1610, f1825

FLOW SENSOR RESISTANCE THROUGH HARNESS

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

Next: p1623, f1624

RETURN SENSOR RESISTANCE THROUGH HARNESS

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

Next: p2151, f1628

VOLTAGE ON/OFF SWITCH

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

Next: !p1631, !f1632

RESISTANCE HARNESS FAN POWER

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

Next: !p1676, !f1677

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER.

Next: p1679, 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: p1687, !f1688

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1689, !f1690

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1691, !f1692

RESISTANCE PUMP AND HARNESS

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

Next: p1717, f1718

RESISTANCE FAN AND HARNESS (MAINS POWER)

GAIN ACCESS TO PCB
REMOVE X3 CONNECTOR FROM THE PCB

Next: p1721, f1722

RESISTANCE HARNESS AND DIVERTER VALVE ACTUATOR

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

Next: p1725, f1726

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB (

Next: p1729, f1730

RESISTANCE HARNESS AND SPARK GENERATOR

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

Next: !p1733, f1734

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p1138, !f1746

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 BOTH ENDS OF

Next: p1803, !f1804

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p1805, !f1806

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR

Next: p1828, !f1829

INSPECTION FLOW TURBINE

ISOLATE AND DRAIN TH

Next: !p1830, !f1831

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p524, !f1840

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 X2B FROM THE PCB

Next: p1844, !f1845

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1846, !f1847

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p1848, !f1849

INSPECTION BURNER

REMOVE THE BURNER

Next: p2052, !f1851

INSPECTION FLUE

Next: !p1852, !f1853

FLOW SENSOR RESISTANCE

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

Next: p1855, !f1856

RETURN SENSOR RESISTANCE

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 TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER.

Next: p1896, f1897

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: p1900, !f1901

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p1902, !f1903

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p1904, !f1905

INSPECTION BURNER

REMOVE THE BURNER

Next: p1906, !f1907

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1908, !f1909

INSPECTION FLUE

Next: !p1910, !f1911

RESISTANCE ELECTRODE SENSE HARNESS

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

Next: p1965, !f1966

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1967, !f1968

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER.

Next: p1969, !f1970

INSPECTION INJECTOR

REMOVE GAS INJECTOR FROM THE FAN VENTURI

Next: p1971, !f1972

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p1973, !f1974

INSPECTION BURNER

REMOVE THE BURNER

Next: p1975, !f1976

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1977, !f1978

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p1979, !f1980

INSPECTION FLUE

Next: !p1981, !f1982

OBSERVATION INTERNAL TIMER

Next: p1984, f1985

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p1996, f1997

INSPECTION SELECTOR SWITCH

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

Next: p1992, !f1993

INSPECTION DIVERTER VALVE HEAD DHW POSITION

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

Next: p234, f235

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p1994, !f1995

INSPECTION SELECTOR SWITCH

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

Next: p2002, !f2003

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2004, !f2005

OBSERVATION INTERNAL TIMER

Next: p2007, f2008

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2019, f2020

INSPECTION SELECTOR SWITCH

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

Next: p2015, !f2016

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2017, !f2018

INSPECTION SELECTOR SWITCH

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

Next: p2025, !f2026

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2027, !f2028

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p1850, !f2056

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, f2141

INSPECTION SELECTOR SWITCH

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

Next: p2136, !f2137

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2138, !f2139

INSPECTION SELECTOR SWITCH

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

Next: p2146, !f2147

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2148, !f2149

INSPECTION SELECTOR SWITCH KNOB

Next: p1627, !f2155

INSPECTION PREHEAT KNOB

Next: !p2157, !f2158

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

Next: p2186, !f2187

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2228, !f2181

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p2422, !f2189

FLOW SENSOR RESISTANCE

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

Next: p2190, !f2191

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2231, !f2193

INFORMATION - RECENTLY REPLACED PCB

Next: !p2229, !f2230

INSPECTION DIVERTER VALVE HEAD OPERATION

SELECTOR SWITCH SET

Next: p2232, ?2233, ?2235

INSPECTION DIVERTER VALVE SPINDLE

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

Next: p2371, !f2246

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p2241, !f2242

VOLTAGE TO DIVERTER VALVE (DHW)

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

Next: p2237, !f2238

RESISTANCE HARNESS DIVERTER VALVE

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

Next: !p2239, !f2240

RESISTANCE HARNESS DIVERTER VALVE

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

Next: !p2243, !f2244

DIAGNOSTICS LITE

DIAGNOSIS RELIES ON

Next: !p2348, !f2349

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW

Next: !p2346, !f2347

FLOW SENSOR RESISTANCE

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

Next: !p2344, !f2345

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p2342, !f2343

VOLTAGE GAS VALVE (AT GAS VALVE)

PREHEAT SWITCHED OFF

Next: !p2338, !f2339

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p2336, !f2337

RESISTANCE PUMP

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

Next: !p2334, !f2335

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: !p2332, !f2333

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p2330, !f2331

MAINS VOLTAGE TO FAN FROM PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p2322, ?2324, ?2326

FAN CONTROL VOLTAGE FROM PCB

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

Next: !p2320, !f2321

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p2316, !f2317

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

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

Next: !p2314, !f2315

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p2312, !f2313

VOLTAGE DIVERTER VALVE AT PCB (QADAI)

PREHEAT OFF
BOILE

Next: !p2310, !f2311

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: !p2302, f2303

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR

Next: p2306, !f2307

INSPECTION FLOW TURBINE

ISOLATE AND DRAIN TH

Next: !p2308, !f2309

RESISTANCE HARNESS FAN POWER

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

Next: !p2328, !f2329

INSPECTION DIVERTER VALVE SPINDLE

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

Next: p240, !f241

OBSERVATION PUMP TYPE

Next: p2351, f2352

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2355, !f2356

OBSERVATION PUMP TYPE

Next: p2358, f2359

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2362, !f2363

OBSERVATION PUMP RUNS

Next: p2401, f2393

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p1422, !f812

PUMP LIMPET TEST

Next: p2402, !f2403

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p2404, f2405

INSPECTION SUMP AND FLUE MANIFOLD

REMOVE SUMP INSPECTION COVER

Next: !p2408, ?2410, ?2412

OBSERVATION PUMP TYPE

Next: p2415, f2416

RESISTANCE PUMP HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR FROM PUMP

Next: !p2419, !f2420

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2466, !f2511

INSPECTION EXTERNAL BYPASS

Next: p2188, !f2510

OBSERVATION PUMP TYPE

Next: p1715, f2541

RESISTANCE FAN AND HARNESS (MAINS POWER)

GAIN ACCESS TO PCB
REMOVE X3 CONNECTOR FROM THE PCB

Next: p2546, f2547

RESISTANCE HARNESS AND DIVERTER VALVE ACTUATOR

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

Next: p2550, f2551

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB (

Next: p2554, f2555

RESISTANCE HARNESS AND SPARK GENERATOR

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

Next: !p2558, f2559

RESISTANCE PUMP (ERP)

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

Next: !p2564, !f2565

INSPECTION SYSTEM PRESSURE

Next: p2569, !f2570

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p2571, !f2572

INSPECTION ISOLATION VALVE FLOW AND RETURN

Next: p2573, !f2574

INSPECTION EXTERNAL BYPASS

Next: p2575, !f2576

PUMP LIMPET TEST

Next: p2577, !f2578

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

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

Next: p2579, f2580

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p2591, !f2592

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: p2583, !f2584

FLOW SENSOR RESISTANCE

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

Next: p2585, !f2586

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2587, !f2588

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2589, !f2590

RESISTANCE HARNESS DIVERTER VALVE

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

Next: !p2593, !f2594

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: !p509, 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: p1832, !f523

VOLTAGE SENSOR LOW WATER PRESSURE (AT PCB)

PREHEAT OFF
ENSUR

Next: !p1079, f1074

FLOW SENSOR RESISTANCE

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

Next: p838, !f998

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: !p793, !f792

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: p856, !f855

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p771, f776

FLOW SENSOR RESISTANCE THROUGH HARNESS

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

Next: p772, f779

RETURN SENSOR RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
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

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

Next: p860, !f1009

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p864, !f1010

FLOW SENSOR RESISTANCE

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

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

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

Next: p948, f945

RETURN SENSOR RESISTANCE THROUGH HARNESS

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

Next: p2156, f949

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: p2357, !f1201

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