XSol Diagnostic System

MAIN COMBI ECO / ECO ELITE / 105HE A

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

CASE OFF

Next: &1045, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &7, !f4

FAULT CODES

Next: &95, !f8

DHW FLOW RATE

Next: &2543, f96

DOES FAN RUN ON DHW DEMAND

Next: &334, f2555

BURNER IGNITES AND ESTABLISHES

{SELHWCHON}

Next: &248, ?186, ?190, ?192

OPERATION DHW

APPLIANCE DHW THERMO

Next: &2593, ?249, ?251, ?253, ?257

DOES PUMP RUN

Next: &185, f335

OPERATION CH

{SELHWCHON}
CH THERMOSTAT SET TO MAX

Next: &nff, ?360, ?362, ?368

OVERHEAT INVESTIGATION

OUT OF MODEL

Next: &nff, f438

E20 FAULT CODE

OUT OF MODEL

Next: &nff, f585

E50 FAULT CODE

OUT OF MODEL

Next: &nff, f591

E119 FAULT CODE

OUT OF MODEL

Next: &nff, f598

E125 FAULT CODE

OUT OF MODEL

Next: &nff, f628

E160 FAULT CODE

OUT OF MODEL

Next: &nff, f721

FUSE FURTHER INVESTIGATION

OUT OF MODEL

Next: &nff, f806

E168 FAULT CODE

E168 FAULT CODE
T

Next: &nff, f1615

E156 FAULT CODE

Next: &nff, !f1022

POWER UP

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &1093, ?1465, ?1467

BOILER ENTERS STANDBY MODE

{SELHWCHON}
ENSUR

Next: &3, ?1094, ?1368, ?2771

E164 FAULT CODE

OUT OF MODEL

Next: &nff, f1176

INFORMATION INTELLIGENT PREHEAT

THE BOILER INCORPORA

Next: &nff, !f2173

OBSERVATION DHW DEMAND RECOGNISED

SELECTOR SWITCH ON HOT WATER
RUN DHW TAP AT 3 LITRES PER MINUTE

Next: &105, f2545

OBSERVATION CH DEMAND RECOGNISED

SELECTOR SWITCH ON DHW AND CH
APPLIANCE DHW THERMOSTAT TO MIN

Next: &357, f2594

SF OR P CALIBRATION FUNCTION

INTENTIONALLY BLANK - HEADER FOR FAULT COD

Next: &nff, f2868

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f2872

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f2874

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2876

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2880

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2884

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2888

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2896

HEADER FOR QADAI FAN AC RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2900

HEADER FOR QADAI FAN AC VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2904

HEADER FOR QADAI DHW SENSOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2908

HEADER FOR QADAI DIVERTER VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2912

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2916

TEMP LOW

SENSOR - BOILER - SPARE

Next: End

LOW MAINS POWER SUPPLY CAUSING E156

Next: End

DC SECTION TO FAN FAULTY CAUSING FAN RUNNING CONTINUOUSLY

HARNESS - WIRING

Next: End

NO PERMANENT DC SUPPLY TO FAN CAUSING E160 2

PCB

Next: End

LOW CAUSING E164

SYSTEM PRESSURE

Next: End

BLOCKED/FAULTY CAUSING E164

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

NO PUMP VOLTAGE CAUISNG E164

PCB

Next: End

E164

PUMP

Next: End

NOT RECOGNISING CONTROL FROM PCB 2

FAN

Next: End

POOR FLOW RATE

FLOW REGULATOR

Next: End

FROST PROTECTION

SENSOR - NTC (DHW)

Next: End

LEAK OR OPEN TAP MAKING FLOW SWITCH

HOT WATER TAP OR PIPEWORK

Next: End

STUCK MADE

FLOW REGULATOR

Next: End

FAULTY CASUING DEMAND WHEN NONE PRESENT

SENSOR - HALL EFFECT

Next: End

DHW FLOW SENSOR SENSOR SECTION SHORTED GIVING DEMAND

HARNESS - WIRING

Next: End

FROST PROTECTION

SENSOR - BOILER - SPARE

Next: End

SHOWING CH DEMAND WHEN IT SHOULD NOT/FALSE FROST PROTECTION

PCB

Next: End

SHOWING CH DEMAND WHEN IT SHOULD NOT/FALSE FROST PROTECTION 2

PCB

Next: End

BLOWN

FUSE 3AMP

Next: End

BLOWN

FUSE 2 AMP (LIVE)

Next: End

BLOWN

FUSE 2 AMP (NEUTRAL)

Next: End

ERRATIC TEMPERATURE DISPLAY

SENSOR - BOILER - SPARE

Next: End

NO DC DEMAND VOLTAGE CAUSING E160

PCB

Next: End

DC SECTION TO FAN FAULTY PREVENTING FAN RUNNING CAUSING E160

HARNESS - WIRING

Next: End

NO PERMANENT VOLTAGE TO FAN CAUSING E160 3

PCB

Next: End

NO DC DEMAND VOLTAGE CAUSING E160 2

PCB

Next: End

E168

PUMP

Next: End

SOLENOID CAUSING E168

GAS VALVE

Next: End

CAUSING E168

MOTOR - 3 WAY VALVE

Next: End

CAUSING E168

SPARK GENERATOR

Next: End

AC SIDE CAUSING E168

FAN

Next: End

DC SIDE CAUSING E168

FAN

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

SENSOR - BOILER - SPARE

Next: End

INSUFFICIENT

WATER SUPPLY

Next: End

OPERATION DHW - DHW COOL RADS COOL

PUMP

Next: End

COOL HW

SENSOR - NTC (DHW)

Next: End

DHW COOL RADS COOL

SENSOR - BOILER - SPARE

Next: End

INSUFFICIENT PREVENTING RECTIFICATION

GAS INLET PRESSURE

Next: End

BLANK FOR CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

INSUFFICIENT CAUSING BAFFLING

GAS INLET PRESSURE

Next: End

NO VOLTAGE TO DIVERTER FOR CH CAUSING OVERHEAT

PCB

Next: End

BLOCKED CAUSING BAFFLING

BODY - CONDENSATE TRAP

Next: End

DIVERTER VALVE SECTION FAULTY PREVENTING MOVING TO CH CAUSING OVERHEAT

HARNESS - WIRING - HIGH VOLTAGE

Next: End

OVERHEAT

TAP - ISOLATION - RETURN (FILTER)

Next: End

NO VOLTAGE TO DIVERTER FOR CH CAUSING OVERHEAT 2

PCB

Next: End

DIVERTER VALVE SECTION FAULTY PREVENTING MOVING TO CH CAUSING OVERHEAT 2

HARNESS - WIRING - HIGH VOLTAGE

Next: End

OVERHEAT DHW DIFF OK

TAP - ISOLATION - RETURN (FILTER)

Next: End

RESTRICTED/BLOCKED/DAMAGED CAUSING BAFFLING

BURNER

Next: End

BLOCKAGE CASUING POOR DHW

3 WAY VALVE ASSEMBLY

Next: End

RESTRICTED LOWERING OUTPUT

BURNER

Next: End

FLUEWAYS RESTRICTED LOWERING OUTPUT

HEAT EXCHANGER ASSEMBLY

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANOH

THERMOSTAT - LIMIT

Next: End

NO RESET OVERHEAT

SWITCH - SELECTOR - 4 POSITION

Next: End

BLANK FOR INFORMATION INTELLIGENT PREHEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

RESTRITED BLOCKED OR SPLIT PREVENTING IGNITON

PIPE - PRESSURE SWITCH

Next: End

SPARK GENERATOR HARNESS SECTION FAULTY PREVENTING SPARKING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

RESTRICTED/BLOCKED OR SPLIT CAUSING BAFFLING

PIPE - PRESSURE SWITCH

Next: End

RESTRICTED/BLOCKED CAUSING WRONG MIX AND BAFFLING

INJECTOR

Next: End

RESTRICTED/BLOCKED OR INNER BREACHED CAUSING BAFFLING

FLUE

Next: End

RESTRICTED REDUCING OUTPUT

INJECTOR

Next: End

RESTRICTED CAUSING LOW OUTPUT

FLUE

Next: End

EXTERNAL MIXING LOWERING DHW TEMPERATURE

EXTERNAL MIXING

Next: End

RESTRICTED/BLOCKED PREVENITNG IGNITION

FLUE

Next: End

RESTRICTED/BLOCKED PREVENTING IGNITION

INJECTOR

Next: End

RESTRICTED/BLOCKED NOT IGNITING 2

FAN

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

FAULTY SOLENOID PREVENTING OPENING

GAS VALVE

Next: End

RESTRICTED/BLOCKED PREVENING INLET DROP

FLUE

Next: End

RESTRICTED/BLOCKED PREVENING GAS INLET DROP

INJECTOR

Next: End

RESTRICTED/BLOCKED NOT IGNITING

FAN

Next: End

BLOCKED PREVENTING BURNER ESTABLISHING

BODY - CONDENSATE TRAP

Next: End

NO RECTIFICATION VOLTAGE

PCB

Next: End

DETECTION LEAD SECTION FAULTY PREVENTING RECTIFICATION

HARNESS - WIRING

Next: End

E125 FAULT CODE

TAP - ISOLATION - RETURN (FILTER)

Next: End

RESTRICTED/BLOCKED CAUSING E125

HEAT EXCHANGER - DHW

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

THERMOSTAT - LIMIT

Next: End

NO FANNO SUPPLY VOLTAGEFANE168

SENSOR - NTC (DHW)

Next: End

LOW CAUSING E168

SYSTEM PRESSURE

Next: End

BLOCKED/FAULTY CAUSING E168

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

SPARK ELECTRODES CAUSING E168

UNIT - IGNITION AND IONISATION - SPARE

Next: End

DHW FLOW SENSOR SECTION FAULTY PREVENTING DEMAND

HARNESS - WIRING

Next: End

NO MOVEMENT

FLOW REGULATOR

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

SENSOR - BOILER - SPARE

Next: End

NO FANNO SUPPLY VOLTAGEFAN

SENSOR - NTC (DHW)

Next: End

LOW PREVENTING FAN RUNNING

SYSTEM PRESSURE

Next: End

BLOCKED/FAULTY PREVENTING DEMAND

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

THERMOSTAT - LIMIT

Next: End

FAN AC SECTION FAULTY PREVENTING FAN RUNNING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO AC VOLTAGE TO FAN PREVENTING FAN RUNNING

PCB

Next: End

DC SECTION TO FAN FAULTY PREVENTING FAN RUNNING

HARNESS - WIRING

Next: End

NO PERMANENT VOLTAGE TO FAN PREVENTING FAN RUNNING

PCB

Next: End

NO DC DEMAND VOLTAGE PREVENTING FAN RUNNING

PCB

Next: End

DHW HOT THEN COLD

PUMP

Next: End

BLOCKAGE CAUSING DHW TO RUN HOT THEN COLD

3 WAY VALVE ASSEMBLY

Next: End

NOT GIVING A DEMAND

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR - NTC (DHW)

Next: End

MISSING OR OPEN CIRCUIT

CABLE - INTEGRAL TIMER

Next: End

NOT RECOGNISING CH DEMAND 2

PCB

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR - BOILER - SPARE

Next: End

RESTRICTED CAUSING WRONG MIX/BAFFLING

PLATE - ORIFICE

Next: End

RESTRICTED CAUSING NO DROP

PLATE - ORIFICE

Next: End

RESTRICTED CAUSING WRONG MIX/NO IGNITION

PLATE - ORIFICE

Next: End

RESTRICTED CASUING LOW OUTPUT

PLATE - ORIFICE

Next: End

AIR IN HEAT EXCHANGER CAUSING POOR DHW TEMPERATURE RISE

SYSTEM PRESSURE / AIR

Next: End

AIR IN HEAT EXCHANGER CAUSING DHW TO RUN HOT AND COLD

SYSTEM PRESSURE / AIR

Next: End

AIR IN BOILER OR SYSTEM CAUSING POOR CH OPERATION

SYSTEM PRESSURE / AIR

Next: End

BLOCKED PREVENTING IGNITION

BODY - CONDENSATE TRAP

Next: End

DHW ONE FAULTY PREHEAT ON

SPINDLE / KNOB ALIGNMENT

Next: End

DHW ONE FAULTY DHW TOO HOT

SPINDLE / KNOB ALIGNMENT

Next: End

CH ONE FAULTY LOW CH TEMPERATURE

SPINDLE / KNOB ALIGNMENT

Next: End

NO OR LOW SUPPLY TO SPARK GENERATOR

PCB

Next: End

DHW ONE FAULTY DHW TOO COOL

SPINDLE / KNOB ALIGNMENT

Next: End

SHORTED CAUSING BLANK DISPLAY

SENSOR - HALL EFFECT

Next: End

SHORTED CASUING BLANK DISPLAY

HARNESS - WIRING

Next: End

SHORTED BLOWING FUSE

SPARK GENERATOR

Next: End

NO CH SWITCH

SWITCH - SELECTOR - 4 POSITION

Next: End

EXTERNAL CONTROLS TO PCB SECTION FAULTY

Next: End

SECTION FROM TERMINAL STRIP TO SELECTOR SWITCH

HARNESS - WIRING - 5 + 1 TERMINAL

Next: End

SPINDLE SEIZED

3 WAY VALVE ASSEMBLY

Next: End

STUCK IN CALIBRATION MODE

PCB

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

SENSOR - BOILER - SPARE

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO POWER TO GAS VALVE

PCB

Next: End

RESTRICTED/BLOCKED FORCING HEAT PAST DIVERTER TO RADIATORS

HEAT EXCHANGER - DHW

Next: End

QADAI

PUMP

Next: End

QADAI NO POWER TO PUMP

PCB

Next: End

QADAI AC

FAN

Next: End

QADAI NO POWER TO FAN AC

PCB

Next: End

QADAI

SENSOR - NTC (DHW)

Next: End

QADAI

MOTOR - 3 WAY VALVE

Next: End

QADAI

SPARK GENERATOR

Next: End

FAN RUNSDHW OPERATION DHW TOO HOT

SENSOR - NTC (DHW)

Next: End

FLUEWAYS RESTRICTED CAUSING BAFFLING

HEAT EXCHANGER ASSEMBLY

Next: End

NO PUMP VOLTAGE

PCB

Next: End

NO OR LOW CHARGE

EXPANSION VESSEL

Next: End

FULLY OR PARTIALLY CLOSED

FLOW AND RETURN VALVES

Next: End

RADS COOL

PUMP

Next: End

BLANK FOR TYPE OF DIAGNOSTIC PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BYPASS PASSING WHEN SHOULDNT

3 WAY VALVE ASSEMBLY

Next: End

BLOCKED

TAP - ISOLATION - RETURN (FILTER)

Next: End

F5 FAULT CODE

PUMP

Next: End

OVERHEAT

SENSOR - NTC (DHW)

Next: End

OVERHEAT

SENSOR - BOILER - SPARE

Next: End

INSUFFICIENT CAUSING LOW OUTPUT

GAS INLET PRESSURE

Next: End

NO VOLTAGE TO DIVERTER FOR CH PREVENTING RADS FROM HEATING

PCB

Next: End

DIVERTER VALVE SECTION FAULTY PREVENTING MOVING TO CH

HARNESS - WIRING - HIGH VOLTAGE

Next: End

DIVERTER VALVE SECTION FAULTY PREVENTING MOVING TO DHW

HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO VOLTAGE TO DIVERTER FOR DHW

PCB

Next: End

NO PUMP VOLTAGE CAUSING OVERHEAT

PCB

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE20

SENSOR - BOILER - SPARE

Next: End

NO FANNO SUPPLY VOLTAGEFANE50

SENSOR - NTC (DHW)

Next: End

LOW CAUSING E119

SYSTEM PRESSURE

Next: End

BLOCKED/FAULTY CAUSING E119

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

NO PUMP VOLTAGE CAUSING E125

PCB

Next: End

E125

PUMP

Next: End

E125

SENSOR - BOILER - SPARE

Next: End

E125

SENSOR - NTC (DHW)

Next: End

NO RESET

SWITCH - SELECTOR - 4 POSITION

Next: End

FAN AC SECTION FAULTY PREVENTING FAN RUNNING CAUSING E160

HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO AC VOLTAGE TO FAN CAUSING E160

PCB

Next: End

DC SECTION TO FAN FAULTY CAUSING E160

HARNESS - WIRING

Next: End

NO PERMAMENT DC SUPPLY TO FAN CAUSING E160

PCB

Next: End

BLANK FOR FAULT CODEES

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO SIGNAL FROM HALL SENSOR

FAN

Next: End

SOLENOID BLOWING FUSE

GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

DC SIDE BLOWING FUSE

FAN

Next: End

SHORTED BLOWING FUSE

MOTOR - 3 WAY VALVE

Next: End

AC SIDE BLOWING FUSE

FAN

Next: End

POOR FLOW RATE

TAP - ISOLATION - DHW INLET

Next: End

WATER PRESSURE SWITCH SECTION FAULTY CAUSING E119

HARNESS - WIRING

Next: End

FAULTY TEMPERATURE CONTROL CAUSING LOW CH TEMPERATURE

PCB

Next: End

STUCK IN E164

PCB

Next: End

WATER PRESSURE SWITCH SECTION FAULTY CASUING E164

HARNESS - WIRING

Next: End

F5 FAULTE125E164

PUMP

Next: End

PUMP SECTION FAULTY CASUING E164

HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO DC DEMAND VOLTAGE TO FAN

PCB

Next: End

CORRECTLY ACTIVATED/NORMAL OPERATION

FROST PROTECTION

Next: End

RECOGNISIGN DHW DEMAND WHEN SHOULD NOT

PCB

Next: End

DEMAND WHEN THERE SHOULD NOT BE

Next: End

GIVING DEMAND WHEN SHOULD NOT

INTEGRAL TIMER / WIRELESS CONTROLS

Next: End

NO MAINS POWER SUPPLY

Next: End

BLANK FOR FUSE FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FUSE FURTHER INVESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FUSE FURTHER INVESTIGATION F3

Z DIRECTION CHOICE OR CONTINUE

Next: End

ERRATIC TEMPERATURE DISPLAY

PCB

Next: End

PRIMARY SENSOR SECTION FAULTY CAUSING ERRATIC DISPLAY

HARNESS - WIRING

Next: End

NOT RECOGNISING CONTROL FROM PCB

FAN

Next: End

NOT RUNNING WITH DEMAND

FAN

Next: End

PUMP SECTION FAULTY CAUSING E168

HARNESS - WIRING - HIGH VOLTAGE

Next: End

GAS VALVE SECTION FAULTY CAUSING E168

HARNESS - WIRING - HIGH VOLTAGE

Next: End

DIVERTER VALVE SECTION FAULTY CAUSING E168

HARNESS - WIRING - HIGH VOLTAGE

Next: End

SPARK GENERATOR SECTION FAULTY CAUSING E168

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAN AC SECTION FAULTY CAUSING E168

HARNESS - WIRING - HIGH VOLTAGE

Next: End

DC SECTION TO FAN FAULTY CASUING E168

HARNESS - WIRING

Next: End

PRIMARY SENSOR SECTION FAULTY CAUSING E168

HARNESS - WIRING

Next: End

NOT MOVING TO CH CAUSING OVERHEAT

MOTOR - 3 WAY VALVE

Next: End

RESTRICTION/BLOCKAGE IN SYSTEM

Next: End

RESTRICTED/BLOCKED CAUSING OVERHEAT

HEAT EXCHANGER - DHW

Next: End

NOT MOVING TO CH CAUSING OVERHEAT 2

MOTOR - 3 WAY VALVE

Next: End

RESTRICTION/BLOCKAGE IN SYSTEM 2

Next: End

RESTRICTED/BLOCKED CAUSING LOW DHW TEMPERATURE

HEAT EXCHANGER - DHW

Next: End

WATERWAYS RESTRICTED CAUSING POOR DHW

HEAT EXCHANGER ASSEMBLY

Next: End

OVERHEAT STAT SECTION FAULTY CAUSING OVERHEAT

HARNESS - WIRING

Next: End

STUCK IN OVERHEAT NOT RESETTING

PCB

Next: End

OPEN CIRCUIT OR POOR CONDITION PREVENTING SPARKING

SPARK PLUG AND HT LEAD

Next: End

OPEN CIRCUIT OR POOR CONDITION PREVENTING IGNITON

SPARK PLUG AND HT LEAD

Next: End

FLUEWAYS RESTRICTED PREVENTING IGNITON

HEAT EXCHANGER ASSEMBLY

Next: End

RESTRICTED/BLOCKED/DAMAGED PREVENTING IGNITION

BURNER

Next: End

INSUFFICIENT PREVENTING IGNITON

GAS INLET PRESSURE

Next: End

NO VOLTAGE TO GAS VALVE

PCB

Next: End

GAS VALVE HARNESS DAMAGED PCB

PCB AND GAS VALVE HARNESS

Next: End

GAS VALVE SECTION FAULTY PREVENTING INLET DROP

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FLUEWAYS RESTRICTED PREVETING INLET PRESSURE DROP

HEAT EXCHANGER ASSEMBLY

Next: End

RESTRICTED/BLOCKED CAUSING NO INLET DROP

BURNER

Next: End

RESTRICTED OR BLOCKED ALLOWING DROP BUT PREVENTING IGNITION

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED OR BLOCKED NO IGNITION

PLENUM - AIR INTAKE

Next: End

RESTRICTED OR BLOCKED CAUSING NO INLET DROP

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED OR BLOCKED NO IGNITION 2

PLENUM - AIR INTAKE

Next: End

RESTRICTED OR BLOCKED CAUSING BAFFLING

PLENUM - AIR INTAKE

Next: End

RESTRICTED OR BLOCKED CAUSING BAFFLING

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED LOWERING OUTPUT

PIPE - INDUCTION RESONANCE

Next: End

RESTRICTED LOWERING OUTPUT

PLENUM - AIR INTAKE

Next: End

NOT RECOGNISING RECTIFICATION

PCB

Next: End

DETECTION ELECTRODE PREVENTING RECTIFICATION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

WATERWAYS RESTRICTED CAUSING E125

HEAT EXCHANGER ASSEMBLY

Next: End

ALL OKAY

BOILER LOCKOUT

Next: End

OVERHEAT STAT SECTION FAULTY CAUSING E168

HARNESS - WIRING

Next: End

DHW SENSOR SECTION FAULTY CASUING E168

HARNESS - WIRING

Next: End

WATER PRESSURE SWITCH SECTION FAULTY CAUSING E168

HARNESS - WIRING

Next: End

NOT RECOGNISING DHW DEMAND

PCB

Next: End

NO DC SUPPLY VOLTAGE TO FLOW SWITCH

PCB

Next: End

NOT SENSING MAGNET FROM FLOW SWITCH ASSEMBLY

SENSOR - HALL EFFECT

Next: End

PRIMARY SENSOR SECTION FAULTY PREVENTING FAN RUNNING

HARNESS - WIRING

Next: End

DHW SENSOR SECTION FAULTY PREVENTING DEMAND

HARNESS - WIRING

Next: End

WATER PRESSURE SWITCH SECTION FAULTY PREVENTING FAN RUNNING

HARNESS - WIRING

Next: End

OVERHEAT STAT SECTION FAULTY PREVENTING FAN RUNNING

HARNESS - WIRING

Next: End

NOT RUNNING WITH DEMAND 2

FAN

Next: End

TEMPERATURE CONTROL FAULTY CAUSING DHW TO RUN HOT AND COLD

PCB

Next: End

RESTRICTED/BLOCKED CAUSING DHW TO RUN HOT AND COLD

HEAT EXCHANGER - DHW

Next: End

WATERWAYS RESTRICTED CAUSING DHW TO RUN HOT AND COLD

HEAT EXCHANGER ASSEMBLY

Next: End

NOT RECOGNISING CH DEMAND

PCB

Next: End

NOT RECOGNISING CH DEMAND 3

PCB

Next: End

NOT GIVING DEMAND WHEN SHOULD

INTEGRAL TIMER / WIRELESS CONTROLS

Next: End

WRONG MIX CASUING BAFFLING

GAS VALVE

Next: End

SOLENOID OK BUT NOT OPENING

GAS VALVE

Next: End

OPENING BUT INCORRECT MIX PREVENTING IGNITION

GAS VALVE

Next: End

TEMPERATURE CONTROL CAUSING POOR DHW TEMPERATURE

PCB

Next: End

SPARK GAP INCORRECT PREVENTING IGNITION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

SPARK GAP FROM BURNER INCORRECT PREVENTING IGNITION

UNIT - IGNITION AND IONISATION - SPARE

Next: End

SPARK GAP INCORRECT OR OPEN CIRCUIT PREVENTING SPARKING

UNIT - IGNITION AND IONISATION - SPARE

Next: End

DHW POTENTIOMETER FAULTY (PREHEAT ON WHEN SHOULDNT BE)

PCB

Next: End

CAUSING E168

PCB

Next: End

NOT MAKING SPARKS

SPARK GENERATOR

Next: End

NO FANB4 OP SEQ

SWITCH - SELECTOR - 4 POSITION

Next: End

NO DISPLAY

PCB

Next: End

PCB FUSE BLOWING

FUSE GONE PCB

Next: End

SPARK GENERATOR SECTION SHORTED

HARNESS - WIRING - HIGH VOLTAGE

Next: End

SELECTOR SWITCH TO PCB SECTION FAULTY

HARNESS - WIRING - 5 + 1 TERMINAL

Next: End

SELECTOR SWITCH TO EXTERNAL CONTROLS SECTION FAULTY

Next: End

NORMAL OPERATION

CALIBRATION FUNCTION

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

PASSING TO RADIATORS

3 WAY VALVE ASSEMBLY

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

PCB POWER TO GAS VALVE

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO PUMP

RESULT AS EXPECTED

Next: End

FAN AC

RESULT AS EXPECTED

Next: End

PCB POWER TO FAN AC

RESULT AS EXPECTED

Next: End

DHW SENSOR

RESULT AS EXPECTED

Next: End

DIVERTER VALVE HEAD

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

TEMPERATURE CONTROL FAULTY CAUSING DHW TOO HOT

PCB

Next: End

VOLTAGE NOT RUNNING

PUMP

Next: End

PUMP SECTION FAULTY PREVENTING PUMP RUNNING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

EXPANSION VESSEL CONNECTION

PIPE ASSEMBLY - RETURN/PUMP (EXPANSION VESSEL PIPE)

Next: End

SYSTEM DESIGN FAULT

Next: End

F5 FAULT

PUMP

Next: End

OVERHEAT

TEMPERATURE OVERHEAT

Next: End

FAULTY TEMPERATURE CONTROL CASUING OVERHEAT

PCB

Next: End

CUTTING OFF

THERMOSTAT - LIMIT

Next: End

NOT MOVING TO CH

MOTOR - 3 WAY VALVE

Next: End

NOT MOVING TO DHW POSITION

MOTOR - 3 WAY VALVE

Next: End

PUMP SECTION FAULTY PREVENTING PUMP RUNNING CUSING OVERHEAT

HARNESS - WIRING - HIGH VOLTAGE

Next: End

PRIMARY SENSOR SECTION FAULTY CAUSING E20

HARNESS - WIRING

Next: End

STUCK IN E20

PCB

Next: End

DHW SESNOR SECTION FAULTY CAUSING FAULT CODE

HARNESS - WIRING

Next: End

STUCK IN E50

PCB

Next: End

STUCK IN E119

PCB

Next: End

F5 FAULTE125

PUMP

Next: End

PUMP SECTION FAULTY CASUING E125

HARNESS - WIRING - HIGH VOLTAGE

Next: End

STUCK IN E125

PCB

Next: End

DIVERTER VALVE SECTION FAULTY BLOWING FUSE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

PUMP SECTION FAULTY BLOWING FUSE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

DC SECTION TO FAN CAUSING FUSE TO BLOW

HARNESS - WIRING

Next: End

GAS VALVE SECTION FAULTY BLOWING FUSE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAN AC SECTION FAULTY BLOWING FUSE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

RESTRICTED/BLOCKED DHW SIDE CAUSING POOR FLOW RATE

HEAT EXCHANGER - DHW

Next: End

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1095

DHW OR CH DEMAND LED ILLUMINATED

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1430

DISPLAY DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM POWER UP

Next: p1469

DISPLAY ILLUMINATES BUT TEMPERATURE DISPLAYED ERRATIC

CHARACTERISTIC TEST FROM POWER UP

Next: p1516

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p2174

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p191

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p193

ELECTRODE UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2770

IGNITION LEAD UNSATISFACTORY

CHARACTERISTIC TEST FROM VOLTAGE FROM INTEGRAL TIMER / WIRELESS RECEIVER

Next: !p2183

ELECTRODE UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2768

IGNITION LEADS UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION IGNITION ELECTRODES & LEADS

Next: !p2395

HEAT EXCHANGER FLUEWAYS RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2401

IGNITION ELECTRODES UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2769

BURNER RESTRICTED AND/OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2405

GAS INLET PRESSURE UNSATISFACTORY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p2407

GAS INLET PRESSURE OK BUT NO DROP SEEN

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p2410

HEAT EXCHANGER FLUEWAYS RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2432

BURNER RESTRICTED AND/OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

Next: !p2434

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2437

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2439

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2442

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2444

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2462

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2461

AIR INTAKE PIPE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2465

FAN AIR INTAKE RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

Next: !p2467

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2775

DHW TOO COOL AND RADIATORS REMAIN COOL WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2779

DHW TOO COOL AND RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p254

NO VOLTAGE PRESENT ON TEST 1

CHARACTERISTIC TEST FROM DHW FLOW SWITCH OPERATION

Next: !p2548

VOLTAGE DOES NOT DROP TO 0 (ZERO) ON TEST 2

CHARACTERISTIC TEST FROM DHW FLOW SWITCH OPERATION

Next: p2550

DHW RUNS HOT AND COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2656

VOLTAGE MISSING

CHARACTERISTIC TEST FROM VOLTAGE FROM INTEGRAL TIMER / WIRELESS RECEIVER

Next: p2602

NO INTEGRAL TIMER FITTED

CHARACTERISTIC TEST FROM VOLTAGE FROM INTEGRAL TIMER / WIRELESS RECEIVER

Next: p2604

DHW LED FLASHES

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p2772

BOILER REACHES TEMPERATURE BUT RADIATORS REMAIN COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2671

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2817

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p369

BOILER TEMP GOES ABOVE 90 DEGREES AND DOESNT CUT OFF

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p512

BOILER LOCKS OUT ON OVERHEAT BEFORE REACHING 85 DEGREES

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p516

10/06/2022 14:18:41 2205_1_50_1 20/10/2022 11:30:00

23/08/2022 14:36:16

Next: End

SYSTEM PRESSURE CHECK

Next: p1183, !f1178

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p1181, !f1182

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p1197, f1198

VOLTAGE PUMP AT PCB

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1199, !f1200

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p1433, !f1434

OBSERVATION WHICH DEMAND LED IS ILLUMINATED

Next: p1455, f1432

VOLTAGE FROM SWITCH LIVE

{SELHWCHON}
NO DEMANDS FOR CH
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p1460, !f1461

RESISTANCE FUSE F1 (FUSED SPUR)

Next: !p1472, f1473

FUSE FURTHER INVESTIGATION F1

Next: !p1474, !f1475

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE CONTROL BOX COVER
REMOVE THE FUSE AND HOLDER FROM THE LIVE (BROWN)

Next: p1478, f1479

FUSE FURTHER INVESTIGATION F2

Next: !p1480, !f1481

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p1519, !f1520

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p1616, f1617

RESISTANCE PUMP

DISCONNECT THE MAINS CABLE TO THE PUMP

Next: !p1618, !f1619

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1622, !f1623

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p1626, !f1627

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p1630, !f1631

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p1634, !f1635

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p1637, !f1638

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p1642, !f1643

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p2045, f2046

VOLTAGE DIVERTER VALVE PCB CH

FUNCTION SELECTOR IN

Next: p2047, !f2048

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p2056, f2057

VOLTAGE DIVERTER VALVE PCB CH

FUNCTION SELECTOR IN

Next: p2058, !f2059

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
APPLI

Next: !p2067, f2068

DIVERTER VALVE BLOCKAGE

ISOLATE AND DRAIN DO

Next: !p2069, !f2070

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2130, !f2131

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p2133, !f2134

INSPECTION IGNITION ELECTRODES & LEADS

REMOVED ELECTRODE ASSEMBLY
DISCONNECT IGNITION LEADS FROM SPARK GENERATOR, NOTE CONNECTIONS

Next: p2179, ?2180, ?2182

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: !p2413, f2414

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2415, !f2416

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2419, !f2420

RESISTANCE DETECTION LEAD

DISCONNECT INLINE CO

Next: !p2475, !f2476

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2481, !f2482

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2492, !f2493

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p2497, !f2498

SYSTEM PRESSURE CHECK

Next: p2501, !f2502

DHW FLOW SWITCH OPERATION

SELECTOR SWITCH TO HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2546, ?2547, ?2549

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2556, f2557

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p2558, !f2559

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p2562, !f2563

SYSTEM PRESSURE CHECK

Next: p2566, !f2567

RESISTANCE SENSOR OVERHEAT STAT

REMOVE THE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2572, !f2573

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
APPLI

Next: !p2589, f2590

DIVERTER VALVE BLOCKAGE

ISOLATE AND DRAIN DO

Next: !p2591, !f2592

VOLTAGE FROM SELECTOR SWITCH

{SELHWCHON}
CH THERMOSTAT TO MAX
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2595, f2847

VOLTAGE DIVERTER VALVE PCB

SELECTOR SWITCH TO HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p563, !f566

VOLTAGE SELECTOR SWITCH

SELECTOR SWITCH IN HOT WATER

Next: !p2852, f2833

VOLTAGE SELECTOR SWITCH INPUT

SELECTOR SWITCH IN HOT WATER

Next: !p2834, !f2866

RESISTANCE SPARK GENERATOR

REMOVE THE CONNECTOR FROM THE SPARK GENERATOR

Next: !p2845, !f2846

VOLTAGE FROM SELECTOR SWITCH AT SELECTOR SWITCH

Next: !p2853, !f2849

OBSERVATION CAN CALIBRATION FUNCTION BE DISABLED

Next: !p2869, !f2870

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p2877, !f2878

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2881, !f2882

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2885, !f2886

RESISTANCE PUMP

DISCONNECT THE MAINS CABLE TO THE PUMP

Next: !p2889, !f2890

VOLTAGE PUMP AT PCB

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2897, !f2898

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2901, !f2902

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2905, !f2906

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p2909, !f2910

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p2913, !f2914

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p2917, !f2918

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p337, f338

VOLTAGE PUMP AT PCB

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p339, !f340

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2087, f2129

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p445, f574

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
APPLI

Next: !p2053, f2044

VOLTAGE DIVERTER VALVE PCB CH

FUNCTION SELECTOR IN

Next: p556, !f557

VOLTAGE PUMP AT PCB

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p575, !f576

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p589, f586

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p587, !f588

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p595, f592

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p593, !f594

SYSTEM PRESSURE CHECK

Next: p606, !f600

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p1001, !f614

BOILER RESET

Next: p642, f655

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p645, f646

VOLTAGE PUMP AT PCB

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p647, !f648

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p656, !f657

IS FAN RUNNING

{SELHWCHON}

Next: p722, f723

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p791, !f792

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p807, f808

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p831, !f810

RESISTANCE PUMP

DISCONNECT THE MAINS CABLE TO THE PUMP

Next: !p829, !f814

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p830, !f818

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p896, !f897

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p828, !f826

DHW ISOLATING VALVE

Next: p1692, !f98

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: !p1020, !f1016

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1114, !f1115

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1116, !f1117

VOLTAGE DC FAN SPEED ON START UP

Next: !p1306, !f1307

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p1179, f1180

DOES PUMP RUN

Next: p1189, f1196

PUMP LIMPET TEST

Next: p1177, !f1201

IS BOILER TEMP LOW

Next: !p1431, f1443

OBSERVATION ISOLATE DHW DOES DHW DEMAND STOP

ISOLATE THE COLD WATER SUPPLY TO THE APPLIANCE

Next: p1435, !f1436

OBSERVATION REMOVE HALL SENSOR DOES DHW DEMAND STOP

REMOVE DHW HALL SENSOR FROM FLOW VALVE

Next: p1437, !f1438

OBSERVATION DISCONNECT HALL SENSOR DOES DHW DEMAND STOP

REMOVE DHW HALL SENSOR FROM FLOW VALVE
REMOVE CONNECTOR FROM THE HALL SENSOR AND MAKE SAFE

Next: p1439, !f1440

RESISTANCE DHW FLOW SWITCH HARNESS

REMOVE CONNECTOR X400 FROM PCB AND CONNECTOR FROM THE HALL SENSOR ON THE FLOW SWITCH

Next: !p1441, !f1442

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p1456, !f1457

OBSERVATION INTEGRAL TIMER OR WIRELESS RECEIVER FITTED

Next: p1458, f1459

VOLTAGE AC FROM INTEGRAL TIMER / WIRELESS RECEIVER

{SELHWCHON}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)
ENSURE NO CH DEMAND

Next: !p1462, !f1463

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p1470, f1471

VOLTAGE AT PCB MAINS

REMOVE CONTROL BOX COVER

Next: p2829, f1477

FUSE FURTHER INVESTIGATION F3

Next: !p1482, !f1483

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p1517, f1518

VOLTAGE DC PCB SPEED REQUEST

Next: !p1525, !f1526

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1552, !f1553

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1554, !f1555

VOLTAGE DC PCB SPEED REQUEST

Next: !p1556, !f1557

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p1620, f1621

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: p1624, f1625

RESISTANCE IGNITER AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1628, f1629

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1632, f1633

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p1639, f1636

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2490, f1641

WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p97, !f1696

PUMP LIMPET TEST

Next: p1752, !f1753

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p1754, !f1755

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p2064, !f1757

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p2246, !f203

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p2468, !f195

INSPECTION CONDENSATE PIPE

Next: p2267, !f205

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
APPLI

Next: p453, f2055

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p206, !f207

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2051, !f2052

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p2049, !f2050

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2062, !f2063

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p2060, !f2061

INSPECTION HEAT EXCHANGER

Next: p2609, !f305

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE C

Next: p2369, f2066

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2071, !f2072

INSPECTION HEAT EXCHANGER

Next: p2618, !f2074

BOILER RESET

Next: p439, f2132

INSPECTION COMPENSATION TUBE

Next: p2688, !f2176

OBSERVATION SPARKING OCCURS

REMOVE THE REARMOST

Next: p2382, f2178

RESISTANCE SPARK GENERATOR HARNESS

REMOVE CONNECTOR FROM SPARK GENERATOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2825, !f2185

INSPECTION COMPENSATION TUBE

Next: p202, !f2256

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p204, !f2265

INSPECTION FLUE

Next: p2450, !f2277

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2347, ?2464, ?2466

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2355, !f2365

INSPECTION FLUE

Next: p2065, !f2366

TEMPERATURE COMPARISON DHW OUTLET AND APPLIANCE OUTLET

Next: p2339, !f2381

PRESSURE GAS INLET AND DROP

{SELHWCHON}
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2383, ?2406, ?2408

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2384, ?2436, ?2438

INSPECTION FLUE

Next: p2386, !f2387

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2388, !f2389

INSPECTION IGNITION ELECTRODES & LEADS

REMOVED ELECTRODE ASSEMBLY
DISCONNECT IGNITION LEADS FROM SPARK GENERATOR, NOTE CONNECTIONS

Next: p2390, ?2392, ?2394

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: p2396, !f2397

INSPECTION BURNER/ ELECTRODE POSITION/ HEAT EXCHANGER FLUEWAYS

REMOVE BURNER DOOR ASSEMBLY

Next: p2615, ?2400, ?2402, ?2404

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2411, f2412

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p2417, f2418

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2421, ?2441, ?2443

INSPECTION FLUE

Next: p2423, !f2424

INSPECTION INJECTOR

REMOVE THE INJECTOR

Next: p2425, !f2426

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: p2427, !f2428

INSPECTION BURNER / HEAT EXCHANGER FLUEWAYS

REMOVE BURNER ASSEMBLY FROM BOILER

Next: p2612, ?2431, ?2433

INSPECTION AIR INTAKE PIPE AND FAN AIR INTAKE

REMOVE THE AIR INTAKE PIPE

Next: p2257, ?2458, ?2460

INSPECTION CONDENSATE PIPE

Next: p2469, !f2470

VOLTAGE RECTIFICATION ON PCB

{SELHWCHON}
REMOVE THE FLAME SENSE LEAD FROM TERMINAL X501

Next: p2471, !f2472

FLAME SENSE VOLTAGE AT PCB

{SELHWCHON}

Next: !p2473, f2474

CH TEST LOCKOUT

{SELHWCHON}
APPLI

Next: p2479, f2480

HW TEST LOCKOUT

SELECTOR SWITCH TO H

Next: !p2483, !f2484

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2494, f2491

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2495, f2496

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2499, f2500

INSPECTION ELECTRODES

REMOVE THE ELECTRODE ASSEMBLY FROM THE BOILER

Next: !p2823, !f2506

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: !p301, !f302

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p2503, !f2504

GAS INLET PRESSURE

{SELHWCHON}
SET D

Next: p1751, !f537

INSPECTION DIVERTER VALVE DHW POSITION

SELECTOR SWITCH IN HOT WATER
REMOVE DIVERTER VALVE MOTOR

Next: p280, f281

RESISTANCE DHW FLOW SWITCH HARNESS

REMOVE CONNECTOR X400 FROM PCB AND CONNECTOR FROM THE HALL SENSOR ON THE FLOW SWITCH

Next: p2551, !f2552

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE MAINS WATER

Next: !p2553, !f2554

RESISTANCE SENSOR TEMP DHW AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2560, f2561

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2564, f2565

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2570, f2571

RESISTANCE WATER PRESSURE SWITCH

REMOVE THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: !p2568, !f2569

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2574, !f2575

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2576, !f2577

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p2578, !f2579

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2580, !f2581

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p259, !f260

VOLTAGE DC PCB SPEED REQUEST

Next: !p2582, !f2583

PUMP LIMPET TEST

Next: p2585, !f2586

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE C

Next: !p2587, f2588

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p2584, !f261

VOLTAGE FROM EXTERNAL CONTROLS

{SELHWCHON}
CH THERMOSTAT TO MAX

Next: p2854, !f2598

VOLTAGE FROM INTEGRAL TIMER / WIRELESS RECEIVER

{SELHWCHON}

Next: !p2599, ?2601, ?2603

VOLTAGE TO INTEGRAL TIMER / WIRELESS RECEIVER

{SELHWCHON}

Next: !p2607, !f2608

VOLTAGE LINKED CONNECTOR

{SELHWCHON}

Next: !p2605, !f2606

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2610, !f2611

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2613, !f2614

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2616, !f2617

INSPECTION ORIFICE PLATE

SEPARATE THE FAN FROM THE AIR/GAS INLET MANIFOLD

Next: !p2619, !f2620

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p252, !f2655

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p258, !f2670

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p361, !f2687

INSPECTION CONDENSATE PIPE

Next: p2175, !f2767

OPERATION DHW CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: !p2773, !f2774

OPERATION DHW CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: p250, !f2815

OPERATION DHW CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: p2621, !f2828

INSPECTION DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p286, !f287

OPERATION CH CONTROL KNOB/SPINDLE

GAIN ACCESS TO PCB

Next: p1014, !f2821

VOLTAGE AC SPARK GENERATOR

{SELHWCHON}
GAIN

Next: !p2826, !f2827

VOLTAGE MAINS IN AT PCB

Next: p2837, f2831

REMOVE DHW FLOW SWITCH DOES DISPLAY NOW WORK

REMOVE DHW HALL SENS

Next: p2838, !f2839

REMOVE CONNECTOR X400 DOES DISPLAY NOW WORK

REMOVE CONNECTOR X400 FROM PCB

Next: !p2840, !f2841

RESISTANCE SPARK GENERATOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p2843, f2844

RESISTANCE HARNESS EXTERNAL CONTROLS TO PCB

REMOVE CONNECTOR X3 FROM THE PCB

Next: p2597, !f2865

INSPECTION HEAT EXCHANGER DHW

DRAIN PRIMARY CIRCUIT OF BOILER DOWN
TURN OFF HW ISOLATION VALVE

Next: !p288, !f289

INSPECTION FLOW AND RETURN VALVES

Next: p389, !f390

EXPANSION VESSEL PRESSURE

BOILER DISCHARGED

Next: !p370, !f371

INSPECTION DIVERTER VALVE POSITION CH

{SELHWCHON}
ALL HEATING CONTROLS CALLING
REMOVE DIVERTER VALVE MOTOR/ACTUATOR

Next: p391, f555

PUMP LIMPET TEST

Next: p397, !f398

BYPASS PIPE TEMPERATURE

{SELHWCHON}
USE T

Next: p399, !f400

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p401, !f402

DOES PUMP RUN

Next: p443, f444

PUMP LIMPET TEST

Next: p447, !f448

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p449, !f529

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p451, !f528

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE C

Next: p2021, f454

CH TEST OVERHEAT

{SELHWCHON}
APPLI

Next: !p462, ?466, ?468

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p558, !f559

RESISTANCE DIVERTER HARNESS

REMOVE CONNECTOR X3 FROM PCB
REMOVE DIVERTER HEAD FROM ITS CONNECTOR

Next: !p564, !f565

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p611, f612

DOES PUMP RUN

Next: p643, f644

PUMP LIMPET TEST

Next: p649, !f650

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT THE INLINE CONNECTOR TO THE PRIMARY SENSOR

Next: p651, !f652

RESISTANCE SENSOR TEMP DHW

REMOVE THE LEAD FROM THE DHW SENSOR

Next: p2478, !f654

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p797, !f795

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1551, !f794

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p798, !f799

VOLTAGE DC FROM FAN

{SELHWCHON}

Next: p1524, !f804

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p811, f812

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p815, f816

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p819, f820

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X3 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: p2842, f824

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE MAINS WATER

Next: !p99, !f1308

Welcome to the XSol Diagnostic System