XSol Diagnostic System

4704412 VAILLANT ECOMAX 824/2 E

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

4704412 VAILLANT ECOMAX 824/2 E - CASE REMOVAL INSTRUCTIONS

Next: &4178, !f219

OBSERVATION DISPLAY OPERATES

ON/OFF SWITCH ON
DHW AND CH THERMOSTATS TO MIN (FULLY ANTI-CLOCKWISE)

Next: &2042, ?2817, ?3327, ?3332, ?4254

DHW FLOW RATE

Next: &542, f104

OBSERVATION FAN RUNS

Next: &177, f1357

OBSERVATION BURNER IGNITION AND ESTABLISH

Next: &2498, ?183, ?185, ?187, ?3444

OPERATION DHW

Next: &444, ?278, ?280, ?282, ?284

OPERATION CH

CH THERMOSTAT SET TO MAX

Next: &501, ?440, ?442, ?3793

OBSERVATION CH DEMAND RECOGNISED

Next: &437, f1512

OBSERVATION WARMSTART OPERATION

ENSURE APPLIANCE PRIMARY CIRCUIT TEMPERATURE IS BELOW 40°C
TURN DHW THERMOSTAT FULLY CLOCKWISE

Next: &nff, ?503, ?505, ?4219

OBSERVATION DHW DEMAND RECOGNISED

TURN HOT WATER TAP O

Next: &554, f543

OBSERVATION DOES PUMP RUN

Next: &137, f3423

HEADER FOR F25 (LOW SYSTEM PRESSURE)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f3066

HEADER FOR F64 (SENSORS OR ELECTRONIC FAULT)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f3837

HEADER FOR F20, F22, F23, F24 (CIRCULATION / OVERHEAT ISSUES)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f2090

HEADER FOR F3 AND F13 (DHW SENSOR)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f762

HEADER FOR FAULT CODE F32, F34, F37 (FAN FAULT)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f856

HEADER FOR F60 AND F61 (GAS VALVE ELECTRICAL FAULT)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f1593

HEADER FOR FUSE INVESTIGATION

HEADER FOR FUSE INVESTIGATION - NOT USED

Next: &nff, f1607

VIEWING AND ADJUSTING DIAGNOSTIC CODES GUIDE

THE METHOD OF CHANGI

Next: &nff, !f1444

TYPE OF DIAGNOSTIC PROCEDURE

Next: &97, !f2043

PRESSURE GAS INLET (BURNER LIT AND ESTABLISHED)

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: &277, !f2499

HEADER FOR F27, F62, F67 (FALSE FLAME / GAS VALVE PASSING)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f3237

HEADER FOR F1 AND F11 (RETURN SENSOR FAULT)

HEADER FOR FAULT CODE NOT USED

Next: &nff, f3890

HEADER FOR F0 AND F10 (FLOW SENSOR FAULT)

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f3883

INSPECTION FLUE COLLECTOR AND SEALS

Next: &3, !f4179

HEADER FOR FAULT CODE F43

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f4249

BAFFLING OUT (BLOCKED)

PIPE - AIR - INLET

Next: End

BURNER BAFFLING

GAS INLET PRESSURE

Next: End

NOT OPERATING DIVERTER VALVE

PCB

Next: End

DIVERTER VALVE MOTOR

CABLE TREE

Next: End

POOR DHW FLOW

DHW ISOLATION VALVE

Next: End

DHW FLOW RATE

COLD WATER SUPPLY

Next: End

FAN DOES NOT RUN

PCB

Next: End

FAN DOES NOT RUN

CABLE TREE

Next: End

CALLING UP THE INSTALLER LEVEL

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE F32

PCB

Next: End

FAULT CODE F32 2

PCB

Next: End

FAULT CODE F32 1

PCB

Next: End

FAULT CODE F32

CABLE TREE

Next: End

FAULT CODE F61

GAS VALVE

Next: End

FAULT CODE F61

PCB

Next: End

F13

PCB

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

F23 F24 F83 F84

SENSOR - NTC

Next: End

F23 F24 F83 F84

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

BLANK FOR CASE OFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

TOO LOW

GAS INLET PRESSURE

Next: End

BAFFLING

HEAT EXCHANGER

Next: End

BAFFLING

BURNER

Next: End

BAFFLING

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

BAFFLING

FLUE ASSEMBLY

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (MAINS)

Next: End

FAULT CODE F32 1

CABLE TREE

Next: End

F32

CABLE TREE

Next: End

FAULT CODE F68

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

FAULT CODE F68

FLUE ASSEMBLY

Next: End

FAULT CODE F68

IGNITION WIRE

Next: End

FAULT CODE F68

ELECTRODE IGNITION/MONITORING

Next: End

BLANK FOR FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FUSE F1

Next: End

PCB MAIN

PCB

Next: End

S34

SENSOR - NTC

Next: End

S34

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW SPINDLE SNAPPED

SET - 3 OFF - KNOBS

Next: End

FROST PROTECTION

SENSOR - NTC

Next: End

FROST PROTECTION

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

FAULTY FROST PROTECTION

PCB

Next: End

SENSING DHW DEMAND WHEN NONE

PCB

Next: End

NO VOLTAGE TO PUMP

PCB

Next: End

STUCK

AQUA SENSOR - IMPELLER ONLY

Next: End

DC HALL SENSOR

CABLE TREE

Next: End

NOT IGNITING

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

BURNER NOT IGNITING

GAS INLET PRESSURE

Next: End

BURNER DOES NOT IGNITE

PCB AND GAS SECTION

Next: End

SPARKING BUT NOT LIGHTING

GAS VALVE

Next: End

HIGH FAN PRESSURE

PIPE - AIR - INLET

Next: End

RESTRICTED FAN PRESSURE

FLUE ASSEMBLY

Next: End

RESTRICTED FAN PRESSURE

BURNER

Next: End

RESTRICTED FAN PRESSURE

HEAT EXCHANGER

Next: End

FAN PRESSURE INCORRECT

FAN ASSEMBLY

Next: End

NOT IGNITING

ELECTRODE IGNITION/MONITORING

Next: End

RESTRICTED OR BLOCKED

AQUA SENSOR - IMPELLER ONLY

Next: End

NO DEMAND TO FAN

SENSOR - NTC

Next: End

NO DEMAND FOR FAN

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

NO FAN DEMAND DUE TO EXCESSIVE DIFFERENTIAL

PUMP

Next: End

NO DEMAND TO FAN DUE TO EXCESSIVE DIFFERENTIAL

FILTER PRIMARY CIRCUIT

Next: End

NO FAN DEMAND DUE TO EXCESSIVE DIFFERENTIAL

HEAT EXCHANGER - 12 PLATES - DHW

Next: End

DHW SPINDLE SNAPPED 2

SET - 3 OFF - KNOBS

Next: End

DHW SPINDLE SNAPPED 3

SET - 3 OFF - KNOBS

Next: End

DHW TOO COOL

SENSOR - NTC

Next: End

DHW TOO COOL

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

SLOW OR WEAK

PUMP

Next: End

DHW TOO COOL RADS COLD EXCESSIVE DIFFERENTIAL

FILTER PRIMARY CIRCUIT

Next: End

POOR HOT WATER

EXTERNAL MIXING

Next: End

DHW SPINDLE SNAPPED 4

SET - 3 OFF - KNOBS

Next: End

SHORTED TO EARTH

SENSOR - NTC

Next: End

OUT OF CALIBRATION

SENSOR - NTC

Next: End

OUT OF CALIBRATION 2

SENSOR - NTC

Next: End

RESTRICTED / BLOCKED

RUBBER TUBE / PIPE

Next: End

LIMITER TRIPPED

UNDERFLOOR HEATING

Next: End

NO VOLTAGE TO 24V CONTROLS 2

PCB

Next: End

NO VOLTAGE TO 24V CONTROLS3

PCB

Next: End

IGNITES BUT DOES NOT ESTABLISH

PIPE - AIR - INLET

Next: End

NOT ESTABLISHING

GAS INLET PRESSURE

Next: End

NOT RECTIFYING

IGNITION WIRE

Next: End

NOT RECTIFYING

ELECTRODE IGNITION/MONITORING

Next: End

CAUSING NO RECTIFICATION

BURNER

Next: End

NOT ESTABLISHING

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

FLAT

EXPANSION VESSEL 10L

Next: End

NO WARMSTART

SENSOR - NTC

Next: End

NO WARMSTART

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PREVENTING WARMSTART

SENSOR - NTC

Next: End

UNABLE TO ADJUST DIAGNOSTIC CODE

PCB

Next: End

D000

ADJUSTMENT DIAGNOSTIC CODES

Next: End

CH STAYING TOO COOL

SENSOR - NTC

Next: End

CH STAYING TOO COOL

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PASSING

GAS VALVE

Next: End

FAULT CODES

SENSOR - NTC

Next: End

FAULT CODES

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

FAULT CODE F25

PCB

Next: End

F13

SENSOR - NTC

Next: End

NOT MAKING / RESTRICTED OR BLOCKED

SENSOR - PRESSURE

Next: End

BLOWING FUSE

PUMP

Next: End

BLOWING FUSE

FAN ASSEMBLY

Next: End

DIVERTER SECTION SHORTING

CABLE TREE

Next: End

F68

PCB

Next: End

F0 OR F10

SENSOR - NTC

Next: End

F1 OR F11

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

POOR HOT WATER

PIPE - AIR - INLET

Next: End

POOR HOT WATER

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

POOR HOT WATER

FLUE ASSEMBLY

Next: End

POOR HOT WATER

BURNER

Next: End

POOR HOT WATER

FAN ASSEMBLY

Next: End

POOR HOT WATER

HEAT EXCHANGER

Next: End

POOR HOT WATER UNABLE TO GAS RATE

PIPE - AIR - INLET

Next: End

POOR HOT WATER UNABLE TO GAS RATE

CONDENSATE TRAP, PIPEWORK OR EXTERNAL CONDENSATE DRAIN

Next: End

POOR HOT WATER UNABLE TO GAS RATE

FLUE ASSEMBLY

Next: End

POOR HOT WATER UNABLE TO GAS RATE

BURNER

Next: End

POOR HOT WATER UNABLE TO GAS RATE

FAN ASSEMBLY

Next: End

POOR HOT WATER UNABLE TO GAS RATE

HEAT EXCHANGER

Next: End

SPARKING

IGNITION WIRE

Next: End

DHW RUNS HOT THEN COLD

SENSOR - NTC

Next: End

DHW RUNS HOT THEN COLD

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

OUT OF CALIBRATION 3

SENSOR - NTC

Next: End

NOISY

PUMP

Next: End

NO VOLTAGE TO 24V CONTROLS

PCB

Next: End

RESTRICTED / BLOCKED 2

RUBBER TUBE / PIPE

Next: End

DHW RUNS HOT THEN COLD

FILTER PRIMARY CIRCUIT

Next: End

OVERHEAT

CHECK VALVE / SERVICE COCK - CH

Next: End

NO POWER TO PUMP OVERHEAT

PCB

Next: End

WEAK

PUMP

Next: End

PUMP DOES NOT OVERRUN

PCB

Next: End

NO POWER TO 24V CONTROLS F23 F24 F83 F84

PCB

Next: End

CLOSED TOO MUCH RAISING DIFFERENTIAL

Next: End

CLOSED TOO MUCH OR BLOCKED

AUTO BYPASS VALVE

Next: End

EXCESSIVE DIFFERENTIAL AND TEMP RISE FAULT CODE

FILTER PRIMARY CIRCUIT

Next: End

AIR IN APPLIANCE / SYSTEM

AIR / DE-AERATOR

Next: End

AIR IN APPLIANCE / SYSTEM 2

AIR / DE-AERATOR

Next: End

AIR IN APPLIANCE / SYSTEM 3

AIR / DE-AERATOR

Next: End

AIR IN BOILER / SYSTEM 4

AIR / DE-AERATOR

Next: End

TURNED OFF

CHECK VALVE / SERVICE COCK - CH

Next: End

NOT OPERATING DIVERTER VALVE CH

PCB

Next: End

DIVERTER VALVE MOTOR CH

CABLE TREE

Next: End

NOT OPENING TO RADS POSITION

VALVE - DIVERTER

Next: End

OPEN TOO MUCH SO RADS DONT HEAT

Next: End

BOILER TO TEMP RADS COLD

PUMP

Next: End

OPEN TOO MUCH SO BYPASSING RADS

AUTO BYPASS VALVE

Next: End

SPLIT / LEAKING

FLUE COLLECTOR / SEALS

Next: End

BLOWN

FUSE F2

Next: End

NO SUPPLY TO EXTERNAL CONTROLS

Next: End

NO POWER TO EXTERNAL CONTROLS 3

Next: End

NO POWER TO EXTERNAL CONTOLS 4

PCB

Next: End

NO VOLTAGE TO AQUA SENSOR

PCB

Next: End

CH SPINDLE SNAPPED

SET - 3 OFF - KNOBS

Next: End

DHW SPINDLE SNAPPED 5

SET - 3 OFF - KNOBS

Next: End

NO POWER TO 240V EXTERNAL CONTROLS

Next: End

F0 AND F10 NOT RESETTING

PCB

Next: End

F1 AND F11 NOT RESETTING

PCB

Next: End

F64 NOT RESETTING

PCB

Next: End

UNABLE TO ADJUST D71

PCB

Next: End

D71

ADJUSTMENT DIAGNOSTIC CODES

Next: End

F20 F22 F23 AND F24

RUBBER TUBE / PIPE

Next: End

CODING RESISTOR

CABLE TREE

Next: End

FAULT CODE F43

PCB

Next: End

SER DISPLAYED INCORRECTLY

PCB

Next: End

NO DEMAND TO FAN DUE TO EXCESSIVE DIFFERENTIAL

RUBBER TUBE / PIPE

Next: End

WARMSTART ISSUES

SENSOR - NTC

Next: End

WARMSTART ISSUES

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

TO AQUA SENSOR

CABLE TREE

Next: End

HEAT EXCHANGER - DHW

HEAT EXCHANGER - 12 PLATES - DHW

Next: End

FLOW LIMITER

LIMITER

Next: End

PASSING TO RADS

MOTOR - DIVERTER VALVE

Next: End

FILTER DHW

Next: End

BAFFLING

GAS VALVE

Next: End

NOT RUNNING WITH CORRECT VOLTAGES

FAN ASSEMBLY

Next: End

NOT RESPONDING TO 240V CONTROLS3

PCB

Next: End

F32

FAULT CODE RESET

Next: End

FAULT CODE F32

FAN ASSEMBLY

Next: End

FAULT CODE F61

CABLE TREE

Next: End

F61

FAULT CODE RESET

Next: End

F13

FAULT CODE RESET

Next: End

F13

CABLE TREE

Next: End

OVERHEAT DOES NOT RESET

PCB

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION MAINS

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE F32 1

FAN ASSEMBLY

Next: End

FAULT CODE F32 3

PCB

Next: End

BLANK FOR FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION FUSE F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

DISPLAY PCB

DISPLAY - PRINTED CIRCUIT

Next: End

OPERATION CORRECTLY

FROST PROTECTION - NORMAL OPERATION

Next: End

FAULTY DHW POTENTIOMETER ACTIVATING C

PCB

Next: End

TAP OPEN OR LEAKING DHW DRAW OFF

Next: End

NOT SENSING DEMAND

SENSOR - HALL

Next: End

NOT RECOGNISING DEMAND

PCB

Next: End

HALL SENSOR SIGNAL

FAN ASSEMBLY

Next: End

NO VOLTAGE TO GAS VALVE

PCB

Next: End

BURNER DOES NOT IGNITE

PCB AND HARNESS

Next: End

SOLENOID NOT OPENING

GAS VALVE

Next: End

SPARKING BUT NOT LIGHTING

CABLE TREE

Next: End

INCORRECT MIX

GAS VALVE

Next: End

NO DEMAND TO FAN FROM PCB

PCB

Next: End

PASSING TO RADS

VALVE - DIVERTER

Next: End

NOT RESPONDING TO 240V CONTROLS 2

PCB

Next: End

DHW TOO COOL

PCB

Next: End

DHW SECTION SHORTED

CABLE TREE

Next: End

NOT CONTROLLING HW TEMP

PCB

Next: End

DHW SECTION OPEN CIRCUIT

CABLE TREE

Next: End

DHW TOO COOL

HEAT EXCHANGER - 12 PLATES - DHW

Next: End

DHW TOO COOL

HEAT EXCHANGER

Next: End

NOT RESPONDING TO 24V CONTROLS 2

PCB

Next: End

NOT RESPONDING TO CH DEMAND

Next: End

NOT RESPONDING TO 24V CONTROLS3

PCB

Next: End

NOT RESPONDING TO CH DEMAND3

Next: End

NOT RECOGNISING RECTIFICATION

PCB

Next: End

BLOCKED

PIPE CONNECTION

Next: End

NOT RECOGNISING WARM START FACILITY

PCB

Next: End

NOT HEATING ENOUGH ON WARMSTART

PCB

Next: End

DHW SECTION OPEN CIRCUIT 2

CABLE TREE

Next: End

RAD TEMP LOW

Z DIRECTION CHOICE OR CONTINUE

Next: End

CH REMAINING TOO COOL

PCB

Next: End

THERMISTOR FAULT CODES FLOW SENSOR

CABLE TREE

Next: End

THERMISTOR FAULT CODES RETURN SENSOR

CABLE TREE

Next: End

BLOCKED

MANOMETER

Next: End

LOW CAUSING F25

SYSTEM PRESSURE

Next: End

LOW PRESSURE SWITCH SECTION OPEN CIRCUIT

CABLE TREE

Next: End

FAN SECTION SHORTING

CABLE TREE

Next: End

BLANK DISPLAY

FUSE FURTHER INVESTIGATION

Next: End

BLOWING FUSE

MOTOR - DIVERTER VALVE

Next: End

FLOW SENSOR SECTION

CABLE TREE

Next: End

RETURN SENSOR SECTION

CABLE TREE

Next: End

POOR HOT WATER

GAS VALVE

Next: End

POOR HOT WATER UNABLE TO GAS RATE

PCB

Next: End

SPARKING

ELECTRODE IGNITION/MONITORING

Next: End

NOT SPARKING

PCB

Next: End

DHW RUNS HOT THEN COLD

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS

PCB

Next: End

NOT RESPONDING TO CH DEMAND2

Next: End

NOT RESPONDING TO 240V CONTROLS

PCB

Next: End

DHW RUNS HOT THEN COLD

HEAT EXCHANGER

Next: End

NOISY

HEAT EXCHANGER - 12 PLATES - DHW

Next: End

DHW TOO COOLF23 F24 F83 F84

PCB

Next: End

NOT RESPONDING TO 24V CONTROLS2 F23 F24 F83 F84

PCB

Next: End

NOT RESPONDING TO CH DEMAND F23 F24 F83 F84

Next: End

NOT RESPONDING TO 240V CONTROLS 2F23 F24 F83 F84

PCB

Next: End

F23 F24 F83 F84

HEAT EXCHANGER - 12 PLATES - DHW

Next: End

BLOCKED 2

MANOMETER

Next: End

DHW RUNS HOT THEN COLD

SYSTEM PRESSURE

Next: End

BLOCKED 3

MANOMETER

Next: End

DHW COOL RADS COOL

SYSTEM PRESSURE

Next: End

BLOCKED 4

MANOMETER

Next: End

F23 F24 F83 F84

SYSTEM PRESSURE

Next: End

BLOCKED 5

MANOMETER

Next: End

BOILER TO TEMP RADS COOL

SYSTEM PRESSURE

Next: End

PASSING TO RADS CH

MOTOR - DIVERTER VALVE

Next: End

BOILER TO TEMP BUT RADS COOL

Next: End

NOT RUNNING

PUMP

Next: End

OVERHEAT

PUMP

Next: End

FUSE F2 FURTHER INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT RESPONDING TO CH DEMANDDEMAND RECOGNISED 3

Next: End

NOT RESPONDING TO CH DEMANDDEMAND RECOGNISED 2

Next: End

NOT RESPONDING TO CH DEMANDDEMAND RECOGNISED

Next: End

NOT RESPONDING TO CH DEMAND F23 F24 F83 F84

Next: End

FAULTY SENSOR OR WATER INGRESS

SENSOR - HALL (SHORTED)

Next: End

NOT RECOGNISING WARMSTART

PCB

Next: End

F0 AND F10

FAULT CODE RESET

Next: End

F1 AND F11

FAULT CODE RESET

Next: End

F25

FAULT CODE RESET

Next: End

F64

FAULT CODE RESET

Next: End

FALSE FLAME / PASSING GAS VALVE

FAULT CODE RESET

Next: End

MAXIMUM HEATING TEMPERATURE ADJUSTMENT BLANK

Z DIRECTION CHOICE OR CONTINUE

Next: End

F23 F24 F83 F84

HEAT EXCHANGER

Next: End

F43

FAULT CODE RESET

Next: End

SER DISPLAYED

SERVICE INTERVAL EXPIRED

Next: End

S53 OR S54 WAITING TIME

HEAT EXCHANGER

Next: End

LIMITER BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FLOW LIMITER AND FILTER

Next: !p114

FILTER BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FLOW LIMITER AND FILTER

Next: !p116

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS - FAULT CODE F32

Next: p1580

FAN RUNS BUT FAN RELATED FAULT CODE REOCCURS

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS - FAULT CODE F32

Next: p1582

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p3483

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p3780

BURNER IGNITES BUT BAFFLES OUT/NOISY

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1106

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p3548

TEMPERATURE RISE UNSATISFACTORY, RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p3568

DISPLAY DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p2819

TEMPERATURE RISE UNSATISFACTORY, RADIATORS HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p283

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1752

FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p3329

PUMP RUNS CONTINUOUSLY OR BOILER TRIES TO FIRE WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p3349

SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p3446

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3747

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3583

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3795

PRESSURE CORRECT BUT DOES NOT INCREASE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p3853

PRESSURE LOW BUT INCREASES WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p3855

GAS RATE INCORRECT

CHARACTERISTIC TEST FROM GAS RATE

Next: p3906

UNABLE TO GAS RATE APPLIANCE I E LPG INSTALLATION OR NO METER

CHARACTERISTIC TEST FROM GAS RATE

Next: p3919

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3959

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3961

DIFFERENTIAL EXCESSIVE

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3991

BOILER DOES NOT RESPOND TO CENTRAL HEATING

CHARACTERISTIC TEST FROM DIFFERENTIAL PRIMARY HEAT EXCHANGER

Next: p3993

PRESSURE CORRECT BUT DOES NOT INCREASE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4010

PRESSURE LOW BUT INCREASES WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4012

PRESSURE CORRECT BUT DOES NOT INCREASE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4015

PRESSURE LOW BUT INCREASES WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4017

PRESSURE CORRECT BUT DOES NOT INCREASE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4020

PRESSURE LOW BUT INCREASES WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4022

PRESSURE CORRECT BUT DOES NOT INCREASE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4156

PRESSURE LOW BUT INCREASES WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: !p4158

WARMSTART IS NOT RECOGNISED ON THE DISPLAY

CHARACTERISTIC TEST FROM OBSERVATION WARMSTART OPERATION

Next: p4220

SER FLASHES ON DISPLAY

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p4255

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4153

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4206

WARMSTART IS RECOGNISED ON THE DISPLAY BUT DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION WARMSTART OPERATION

Next: p504

WARMSTART RECOGNISED AND OPERATES BUT DOES NOT HEAT SUFFICIENTLY

CHARACTERISTIC TEST FROM OBSERVATION WARMSTART OPERATION

Next: p506

13/05/2019 10:07:06 1903_1_50_1 01/07/2019 09:57:10

21/05/2019 08:50:29

Next: End

INSPECTION DHW ISOLATION VALVE

Next: p1257, !f1264

VOLTAGE DIVERTER VALVE

REMOVE CONNECTOR FROM THE DIVERTER VALVE AND MAKE SAFE
ENSURE NO DEMANDS
ON/OFF SWITCH OFF

Next: p1153, !f1151

VOLTAGE DC PWM DEMAND AT FAN

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1366, f3549

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED ?

GAIN ACCESS TO THE PCB

Next: p1523, f3775

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1594, f1595

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1596, !f1597

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR FROM THE PCB

Next: p3869, !f3868

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p1960, !f3862

RESET APPLIANCE - ENSURE APPLIANCE IS COOL

ENSURE NO DEMANDS ARE PRESENT
ENSURE APPLIANCE IS COOL

Next: p2097, f2140

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p2141, !f2142

RESISTANCE MAINS SUPPLY FUSE

REMOVE THE MAINS 3A FUSE FROM ITS HOLDER

Next: !p2822, f2823

FUSE FURTHER INVESTIGATION MAINS

Next: !p2824, !f2825

OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: p3851, ?3852, ?3854

RESISTANCE FAN HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE DC FAN CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3163, !f3164

INSPECTION CONDENSATE PIPEWORK

Next: p3238, !f3242

FUSE FURTHER INVESTIGATION F1

Next: !p3378, !f3379

OBSERVATION C SHOWN

Next: p3406, f3403

INSPECTION SPINDLE DHW

GAIN ACCESS TO PCB
TURN THE DHW THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: !p3404, !f3405

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p4181, !f3425

RESISTANCE FAN HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE DC FAN CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3449, !f3450

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p3491, f3492

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p3493, f3494

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p3495, !f3496

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p3499, !f3500

INSPECTION SPINDLE DHW

GAIN ACCESS TO PCB
TURN THE DHW THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: p3550, !f3565

PUMP LIMPET

Next: p3559, !f3560

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3579, ?3580, ?3582

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p3706, !f3707

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p3712, !f3713

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3766, f3767

VOLTAGE TO 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3768, !f3769

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3776, f3777

VOLTAGE TO 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3778, !f3779

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: !p3812, !f3813

ADJUSTMENT - HEATING OUTPUT

Next: p3817, !f3818

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3838, f3839

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: !p3840, !f3841

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3844, !f3845

RESISTANCE LOW PRESSURE SWITCH

REMOVE AIR INTAKE PIPE
REMOVE THE 2 BLACK WIRES FROM THE LOW PRESSURE SWITCH

Next: !p3858, !f3867

RESISTANCE FAN

REMOVE THE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3872, !f3873

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR X4 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p3876, !f3877

RESISTANCE FLOW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3884, f3885

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: !p3886, !f3887

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3891, f3892

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3893, !f3894

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: !p3944, !f3945

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3957, ?3958, ?3960

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3964, f3965

VOLTAGE TO 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3966, !f3967

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p4183, !f3980

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3989, ?3990, ?3992

VOLTAGE FROM 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3996, f3997

VOLTAGE TO 24V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3998, !f3999

VOLTAGE DIVERTER VALVE

REMOVE CONNECTOR FROM THE DIVERTER VALVE AND MAKE SAFE
ENSURE NO DEMANDS
ON/OFF SWITCH OFF

Next: p4166, !f4167

FUSE FURTHER INVESTIGATION F2

Next: !p4189, !f4190

VOLTAGE TO 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p4192, !f4193

VOLTAGE TO 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p4195, !f4223

VOLTAGE TO 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p4198, !f4199

VOLTAGE TO 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p4201, !f4202

VOLTAGE TO AQUA SENSOR (DISCONNECTED)

DISCONNECT THE IN-LINE CONNECTOR TO THE AQUA SENSOR AND MAKE SAFE

Next: !p4204, !f4205

ADJUSTMENT MAXIMUM HEATING TEMPERATURE

Next: p4242, !f4241

RESISTANCE CODING RESISTOR

REMOVE CONNECTOR X2 FROM THE PCB

Next: p4250, !f4251

VOLTAGE DEMAND FROM AQUA SENSOR

{GAINPCBACS}
ENSURE A FLOW RATE ABOVE 2 LITRES PER MINUTE

Next: !p3443, f545

VOLTAGE TO AQUA SENSOR

Next: p546, f4203

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p1956, f1959

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: p891, !f1577

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p188, !f1070

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1050, !f1128

INSPECTION FLOW LIMITER AND FILTER

DHW SUPPLY ISOLATED AND DRAINED
REMOVE THE FLOW LIMITER AND FILTER FROM THE FLOW SENSOR ASSEMBLY

Next: !p112, ?113, ?115

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR X4 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p1154, !f1155

OBSERVATION COLD WATER SUPPLY

Next: p3539, !f1265

INSPECTION CONDENSATE PIPEWORK

Next: p1341, !f2627

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p1343, !f2626

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR ASSEMBLY

Next: !p1345, !f2625

VOLTAGE FAN 22VDC AT PCB

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1374, !f1375

RESISTANCE FAN HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE DC FAN CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1376, !f1377

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p1529, f4197

VOLTAGE DC PWM DEMAND AT FAN

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1583, !f1584

VOLTAGE FAN HALL SENSOR

{GAINPCBACS}

Next: p3161, f3162

VOLTAGE FAN 22VDC AT PCB

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE

Next: p1585, !f1586

RESISTANCE FAN HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE DC FAN CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1587, !f1588

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p1598, !f1599

OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: p4087, ?4009, ?4011

INSPECTION FLUE

Next: p1340, !f2628

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p1957, !f1958

OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: p4117, ?4019, ?4021

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p2143, !f2144

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p3375, f2821

INSPECTION DIVERTER VALVE MOTOR OPERATION

REMOVE THE DIVERTER

Next: !p356, f1149

RESISTANCE FAN HARNESS

REMOVE CONNECTOR X2 FROM THE PCB
REMOVE THE DC FAN CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3165, !f3166

INSPECTION FLUE

Next: p3239, !f3243

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: p3240, !f3244

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p3825, !f3245

FAULT CODES

Next: !p3330, !f3331

OBSERVATION STATUS CODE S34

Next: p3397, f3402

RESISTANCE FUSE F1

REMOVE FUSE F1 FROM ITS HOLDER ON THE PCB

Next: p4184, f3377

VOLTAGE DC DISPLAY PCB

{GAINPCBACS}
REMO

Next: !p3381, !f3382

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3398, !f3399

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3400, !f3401

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3407, !f3408

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: p3409, !f3410

OBSERVATION DHW DEMAND INCORRECTLY RECOGNISED

HOT WATER TAPS OFF

Next: p3411, !f3412

OBSERVATION ISOLATE MAINS WATER - DOES DEMAND STOP ?

TURN OFF THE DHW ISOLATION VALVE

Next: !p3413, !f3414

INSPECTION FLOW TURBINE

DHW ISOLATED AND DRAINED

Next: !p3429, !f3430

VOLTAGE FAN HALL SENSOR

{GAINPCBACS}

Next: p3933, f3448

INSPECTION CONDENSATE PIPEWORK

Next: p3485, !f3484

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3489, !f3487

PRESSURE GAS INLET DROP

ATTACH A PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
ENSURE NO DEMANDS

Next: p3501, f3490

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p3497, f3498

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p3520, !f3503

INSPECTION FLUE

Next: p3530, !f3522

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p3524, !f3525

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR ASSEMBLY

Next: p3527, !f3526

INSPECTION FAN

Next: !p3528, !f3529

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p3523, !f3538

INSPECTION FLOW TURBINE

DHW ISOLATED AND DRAINED

Next: p111, !f3546

INSPECTION SPINDLE DHW

GAIN ACCESS TO PCB
TURN THE DHW THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: p3709, !f3567

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3551, !f3552

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: p3553, !f3554

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3753, f3705

OBSERVATION STATUS CODE S53 OR S54

DHW THERMOSTAT SET TO 3 O'CLOCK POSITION

Next: !p3557, f3558

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: p3561, !f3562

INSPECTION PLATE HEAT EXCHANGER

DHW AND PRIMARY CIRCUIT ISOLATED AND DRAINED
REMOVE THE PLATE HEAT EXCHANGER

Next: p4258, !f3564

OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: p4023, ?4014, ?4016

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3571, !f3572

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: p3615, !f3574

PUMP LIMPET

Next: p3575, !f3576

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3577, f3578

GAS RATE

Next: p3599, ?3902, ?3904

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p3746, !f3598

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED ?

GAIN ACCESS TO THE PCB

Next: p3584, f3765

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3595, f4191

TEMPERATURE COMPARISON OF HOT WATER - EXTERNAL MIXING TEST

Next: !p3613, !f3614

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: p3573, !f3708

INSPECTION SPINDLE DHW

GAIN ACCESS TO PCB
TURN THE DHW THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: p3569, !f3704

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p3710, f3711

INSPECTION FLOW PIPE / HOSES

PRIMARY CIRCUIT DRAI

Next: !p3748, !f3749

RESISTANCE UNDERFLOOR OVERHEAT THERMOSTAT

IF NO LINK IS FITTED

Next: p3555, !f3763

INSPECTION CONDENSATE PIPEWORK

Next: p3781, !f3792

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p3782, !f3783

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3784, !f3785

RESISTANCE IGNITION LEAD

REMOVE THE IGNITION LEAD FROM THE PCB
REMOVE THE IGNITION LEAD FROM THE SPARK ELECTRODE

Next: p3786, !f3787

INSPECTION SPARK ELECTRODE

REMOVE THE SPARK ELECTRODE ASSEMBLY

Next: p3788, !f3789

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: !p3790, !f3791

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p3796, !f3797

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3806, !f3808

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3807, !f3809

OBSERVATION HEATING OUTPUT

ENSURE NO DEMANDS

Next: p4232, f3816

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3821, !f3822

D 0 NOW SET CORRECTLY

THE HEATING OUTPUT S

Next: !p3819, !f3820

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3823, !f3824

TIGHTNESS TEST INSTALLATION

Next: p3878, !f3827

RESISTANCE RETURN SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3847, f3843

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4229, !f4230

RESISTANCE LOW PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3856, f3857

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4228, !f3861

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3870, f3871

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X4 FROM THE PCB

Next: !p3874, f3875

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4231, !f3880

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4224, !f4225

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4226, !f4227

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p3907, !f3908

INSPECTION CONDENSATE PIPEWORK

Next: p3909, !f3910

INSPECTION FLUE

Next: p3911, !f3912

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p3913, !f3914

INSPECTION FAN

Next: p3915, !f3916

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR ASSEMBLY

Next: !p3917, !f3918

INSPECTION AIR INTAKE TUBE

REMOVE AIR INTAKE TUBE

Next: p3920, !f3921

INSPECTION CONDENSATE PIPEWORK

Next: p3922, !f3923

INSPECTION FLUE

Next: p3924, !f3925

INSPECTION BURNER

REMOVE THE COMBUSTION FRONT ASSEMBLY

Next: p3926, !f3927

INSPECTION FAN

Next: p3928, !f3929

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

REMOVE THE BURNER DOOR ASSEMBLY

Next: !p3932, !f3931

OBSERVATION SPARKING

REMOVE THE IGNITION

Next: !p3942, f3943

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p3947, !f3948

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: p3949, !f3950

RESISTANCE DHW SENSOR

REMOVE THE CONNECTOR FROM THE DHW SENSOR

Next: p3951, !f3952

PUMP LIMPET

Next: p3953, !f3954

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3955, f3956

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p3972, !f3973

INSPECTION FLOW PIPE / HOSES

PRIMARY CIRCUIT DRAI

Next: !p3970, !f3971

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED ?

GAIN ACCESS TO THE PCB

Next: p3962, f3963

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p3968, f4194

INSPECTION FLOW AND RETURN VALVES

Next: p3975, !f3976

OBSERVATION DOES PUMP RUN

Next: p3977, f3978

PUMP LIMPET

Next: p3983, !f3984

OBSERVATION PUMP OVERRUN

Next: p3985, !f3986

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3987, f3988

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DRAINED AND DISCHARGED

Next: !p4006, !f4007

INSPECTION EXTERNAL BYPASS

Next: p4002, !f4003

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED ?

GAIN ACCESS TO THE PCB

Next: p3994, f3995

VOLTAGE FROM 240V EXTERNAL CONTROLS

{GAINPCBACS}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING

Next: !p4000, f4200

INSPECTION INTEGRAL BYPASS

APPLIANCE DRAINED AND DISCHARGED
REMOVE THE INTEGRAL BYPASS ASSEMBLY

Next: p4245, !f4005

INSPECTION AUTO AIR VENT / AIR PRESENT

Next: p3657, !f4086

INSPECTION AUTO AIR VENT / AIR PRESENT

Next: p3946, !f4116

INSPECTION AUTO AIR VENT / AIR PRESENT

Next: p3974, !f4152

OBSERVATION SYSTEM PRESSURE AND INCREASE

Next: p4154, ?4155, ?4157

INSPECTION AUTO AIR VENT / AIR PRESENT

Next: p4161, !f4160

INSPECTION FLOW AND RETURN VALVES

Next: p4162, !f4163

INSPECTION DIVERTER VALVE MOTOR OPERATION

REMOVE THE DIVERTER

Next: p4164, f4165

INSPECTION DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE MOTOR FROM THE BODY

Next: p4170, !f4171

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR X4 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p4168, !f4169

INSPECTION EXTERNAL BYPASS

Next: p4172, !f4173

PUMP LIMPET

Next: p4174, !f4175

INSPECTION INTEGRAL BYPASS

APPLIANCE DRAINED AND DISCHARGED
REMOVE THE INTEGRAL BYPASS ASSEMBLY

Next: !p4176, !f4177

RESISTANCE FUSE F2

REMOVE FUSE F1 FROM ITS HOLDER ON THE PCB

Next: p3380, f4188

INSPECTION SPINDLE CH

GAIN ACCESS TO PCB
TURN THE CH THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: p3814, !f4218

INSPECTION SPINDLE DHW

GAIN ACCESS TO PCB
TURN THE DHW THERMOSTAT SO IT IS POINTING STRAIGHT UPWARDS

Next: !p4221, !f4222

OBSERVATION MAXIMUM HEATING TEMPERATURE

ENSURE NO DEMANDS

Next: p3815, f4238

D 71 NOW SET CORRECTLY

THE HEATING TEMPERAT

Next: !p4243, !f4244

INSPECTION FLOW PIPE / HOSES

PRIMARY CIRCUIT DRAI

Next: !p4246, !f4247

RESET APPLIANCE - FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p4252, !f4253

OBSERVATION MAINTENANCE INTERVAL EXPIRED

Next: !p4256, !f4257

INSPECTION FLOW PIPE / HOSES

PRIMARY CIRCUIT DRAI

Next: !p4259, !f4260

RESISTANCE DHW SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p3805, f3799

RESISTANCE FLOW SENSOR

REMOVE THE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE FLOW SENSOR (RED)

Next: p511, !f513

RESISTANCE RETURN SENSOR

REMOVE AIR INTAKE PIPE
REMOVE THE CONNECTOR FROM THE RETURN SENSOR (BLUE)

Next: !p3811, !f514

RESISTANCE HARNESS AQUA SENSOR

REMOVE THE CONNECTOR FROM THE AQUA SENSOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: p3428, !f549

OBSERVATION FAN RUNS - FAN FAULT CODE

Next: !p1578, ?1579, ?1581

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