XSol Diagnostic System

ARISTON CLAS ONE / CLAS NET ONE / E-COMBI ONE

GLOBALLY REPLACED

Next: &219, *

NO FAULT FOUND

Next: nff

OBSERVATION FAN RUNS

GAIN ACCESS TO THE FAN

Next: &292, f2021

OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: &2000, ?70, ?74, ?76

OPERATION CH

Next: &268, ?155, ?157, ?768, ?3261

CASE REMOVAL INSTRUCTIONS

Next: &393, !f220

TYPE OF DIAGNOSTIC PROCEDURE

Next: &1990, !f265

OBSERVATION PUMP OVERRUN

Next: &nff, !f355

OBSERVATION PUMP RUNS

Next: &69, f3790

USER DISPLAY GUIDE

Next: &3086, !f394

HEADER FOR FUSE INVESTIGATION

OK TO BE BLANK

Next: &nff, f3661

HEADER FOR OVERHEAT FAULT CODE 101

OK TO BE BLANK

Next: &nff, f2531

HEADER FOR INSUFFICIENT CIRCULATION FAULT CODE 103 - 107 AND 1P1 1P2 1P3 1P4

OK TO BE BLANK

Next: &nff, f954

HEADER FOR CH FLOW TEMP PROBE ERROR FAULT CODE 110

OK TO BE BLANK

Next: &nff, f956

HEADER FOR LOW PRESSURE FAULT CODE 108

OK TO BE BLANK

Next: &nff, f3203

HEADER FOR EXTERNAL SENSOR ERROR FAULT CODE 114

OK TO BE BLANK

Next: &nff, f968

HEADER FOR FLOOR THERMOSTAT CONTACT OPEN FAULT CODE 116

OK TO BE BLANK

Next: &nff, f974

HEADER FOR EEPROM/ MAIN PCB ERROR FAULT CODE 301, 303, 305, 306 AND 307

OK TO BE BLANK

Next: &nff, !f3692

HEADER FOR COMMUNICATION ERROR FAULT CODE 302

OK TO BE BLANK

Next: &nff, f1078

HEADER FOR FLAME DETECTED GAS VALVE CLOSED FAULT CODE 502

OK TO BE BLANK

Next: &nff, f992

HEADER FOR FAN FAULT CODE 604 AND 612

OK TO BE BLANK

Next: &nff, f1006

HOW TO ACCESS THE PARAMETER SERVICE CODE

Next: &nff, !f1016

HEADER FOR ERROR CODE 201 AND 203 PARAMETER BOILER VERSION INCORRECT

OK TO BE BLANK

Next: &nff, f3397

HEADER FOR TOO MANY RESETS ERROR CODE 304

OK TO BE BLANK

Next: &nff, f1060

OBSERVATION APPLIANCE SELF CHECK

NO DEMANDS

Next: &264, ?1097, ?1101, ?3325, ?4185

HEADER FOR CH RETURN TEMP PROBE ERROR CODE 112

OK TO BE BLANK

Next: &nff, f1166

HOW TO ACTIVATE TEST FUNCTION

ALLOW FOR SELF CHECK TO COMPLETE

Next: &nff, !f1798

HOW TO ACCESS AND MODIFY THE PARAMETERS

Next: &nff, !f1940

DHW FLOW RATE

Next: &1998, f1991

OBSERVATION DHW DEMAND RECOGNISED

TURN HOT WATER TAP ON WITH A FLOW RATE OF 3 L/MIN

Next: &51, f2522

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE INLET TEST POINT

Next: &2002, !f2001

OPERATION DHW

Next: &152, ?2003, ?2005, ?2007, ?2009

PARAMETER INFORMATION - NEW PCB FITTED

Next: &1092, !f3087

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f3294

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f3296

HEADER FOR QADAI FLOW TEMP PROBE

OK TO BE BLANK

Next: &nff, f3733

HEADER FOR QADAI RETURN TEMPERATURE PROBE

OK TO BE BLANK

Next: &nff, f3737

HEADER FOR QADAI GAS VALVE RESISTANCE

OK TO BE BLANK

Next: &nff, f3741

HEADER FOR QADAI GAS VALVE VOLTAGE

OK TO BE BLANK

Next: &nff, f3745

HEADER FOR QADAI PUMP RESISTANCE

OK TO BE BLANK

Next: &nff, f3749

HEADER FOR QADAI PUMP VOLTAGE

OK TO BE BLANK

Next: &nff, f3753

HEADER FOR QADAI FAN RESISTANCE

OK TO BE BLANK

Next: &nff, f3757

HEADER FOR QADAI DHW REED SENSOR VOLTAGE

OK TO BE BLANK

Next: &nff, f3761

HEADER FOR QADAI STEPPER MOTOR RESISTANCE

OK TO BE BLANK

Next: &nff, f3770

HEADER FOR QADAI STEPPER MOTOR VOLTAGE

OK TO BE BLANK

Next: &nff, f3774

HEADER FOR SCHED SERVICE CALL 3P9

OK TO BE BLANK

Next: &nff, f3778

HEADER FOR HIGH PRESSURE ERROR CODE 109

OK TO BE BLANK

Next: &nff, f3782

HEADER FOR PARAMETER 2-4-7 SET INCORRECTLY ERROR CODE 102

OK TO BE BLANK

Next: &nff, f3787

HOW TO ACCESS FAULT CODE HISTORY

Next: &nff, !f4167

ERROR CODE 612

CABLE FAN

Next: End

PARAMETER INFO

Z REDIRECTION

Next: End

ERROR CODE 304

PCB MAIN

Next: End

ERROR CODE 302

PCB MAIN

Next: End

ERROR CODE 302

WIRING - DISPLAY

Next: End

ERROR CODES 1

Z REDIRECTION

Next: End

NO DISPLAY

FUSE (FUSED SPUR)

Next: End

CIRCULATION ERROR CODES

TEMPERATURE PROBE FITMENT

Next: End

CIRCULATION ERROR CODES

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

CIRCULATION ERROR CODES

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

ERROR CODE 502

GAS VALVE

Next: End

TEST FUNCTION ACTIVATION

Z REDIRECTION

Next: End

PARAMETERS

Z REDIRECTION

Next: End

BURNER DOES NOT IGNITE

CABLE GAS VALVE AND PCB MAIN

Next: End

BURNER DOES NOT IGNITE

GAS VALVE & PCB - MAIN

Next: End

POOR FLOW RATE

TAP - COLD WATER

Next: End

POOR FLOW RATE

COLD WATER SUPPLY

Next: End

TOO LOW

GAS PRESSURE INLET

Next: End

FAN NOT RUNNING

CABLE FAN

Next: End

DHW RUNS HOT THEN COLD

SYSTEM PRESSURE

Next: End

CASE REMOVAL

Z REDIRECTION

Next: End

PUMP NOT RUNNING FAULT CODE 102

PCB MAIN

Next: End

PUMP NOT RUNNING FAULT CODE 102

CABLE - PUMP TACO

Next: End

REACHES TEMP RADS COOL

TAP - SERVICE

Next: End

INSUFFICIENT CIRCULATION FAULT CODE

TAP - SERVICE

Next: End

CIRCULATION ISSUES

EXCHANGER (MAIN)

Next: End

CIRCULATION ERROR CODES

BY-PASS

Next: End

CIRCULATION ERROR CODES

WATER FILTER

Next: End

CIRCULATION ERROR CODES

PUMP 5M PWM TACO

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT

PRESSURE GAUGE

Next: End

OVERHEAT FAULT CODE

TAP - SERVICE

Next: End

FOR TYPE DIAG PROCEDURE

Z REDIRECTION

Next: End

BOILER TO TEMP RADS COOL

PUMP 5M PWM TACO

Next: End

BOILER TO TEMP RADS DO NOT HEAT

Next: End

CIRCULATION ERROR CODES

SYSTEM PRESSURE

Next: End

INSUFFICIENT CIRC

PRESSURE GAUGE

Next: End

FAULT CODE 502

GAS VALVE

Next: End

BURNER DOES NOT IGNITE

EXCHANGER (MAIN)

Next: End

DOES NOT IGNITE

FLUE

Next: End

PARAMETER GUIDE

Z REDIRECTION

Next: End

NO DISPLAY

FUSE 250V 2A

Next: End

BURNER DOES NOT ESTABLISH

CONDENASTE TRAP

Next: End

ERROR CODE 612

FAN ASSEMBLY

Next: End

FAULT CODE 108

SYSTEM PRESSURE

Next: End

FAULT CODE 108

PRESSURE GAUGE

Next: End

FAULT CODE 108

PARAMETER DEVICE INDICATOR FOR HEATING CIRCUIT PRESSURE

Next: End

BLANK DISPLAY

PCB MAIN

Next: End

BLANK DISPLAY

WIRING - DISPLAY

Next: End

BLANK FOR LITE DIAGNOSTIC

Z REDIRECTION

Next: End

BLANK FOR QADAI

Z REDIRECTION

Next: End

NOT RUNNING WITH DEMAND

FAN ASSEMBLY

Next: End

NOT SENSING DEMAND

3- WAY VALVE CABLE (DIVERTER STEPPER / REED SWITCH AND LWPS HARNESS)

Next: End

SET INCORRECTLY

PARAMETER APPLIANCE VERSION

Next: End

ERROR CODE 108

3- WAY VALVE CABLE (DIVERTER STEPPER / REED SWITCH AND LWPS HARNESS)

Next: End

IGNITES BUT DOES NOT ESTABLISH

SILENCER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

IGNITION ELECTRODE

Next: End

BURNER IGNITES BUT BAFFLES

FLUE

Next: End

DHW NOT RECOGNISED

FLOW METER MAGNET

Next: End

DHW TOO HOT

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

DHW TOO HOT

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

NO PUMP OVERRUN

PCB MAIN

Next: End

POOR DHW TEMP RISE

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

POOR DHW TEMP RISE

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

POOR DHW TEMP RISE

PUMP 5M PWM TACO

Next: End

POOR DHW TEMP RISE

EXTERNAL MIXING

Next: End

POOR DHW TEMP RISE

WATER FILTER

Next: End

FAILED GAS RATE POOR DHW TEMP

SILENCER

Next: End

FAILED GAS RATE POOR DHW TEMP

FLUE

Next: End

FAILED GAS RATE POOR DHW TEMP

CONDENASTE TRAP

Next: End

POOR DHW TEMP RISE

SYSTEM PRESSURE

Next: End

POOR HW

PARAMETER DHW POWER

Next: End

DHW RUNS HOT THEN COLD

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

DHW RUNS HOT THEN COLD

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

DHW RUNS HOT THEN COLD

PUMP 5M PWM TACO

Next: End

DHW RUNS HOT THEN COLD

WATER FILTER

Next: End

DHW RUNS HOT THEN COLD

TEMPERATURE PROBE FITMENT

Next: End

SET TEMP NOT REACHED

PARAMETER HEATING POWER

Next: End

FAILS TO REACH SET TEMP

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

FAILS TO REACH SET TEMP

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

FAILS TO REACH SET TEMP

SYSTEM PRESSURE

Next: End

ERROR CODE 502

IGNITION ELECTRODE

Next: End

ERROR CODE 116

UNDERFLOOR HEATING THERMOSTAT LINK

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION

CABLE - PUMP TACO

Next: End

TEMP PROBE ERROR CODE

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

TEMP PROBE ERROR CODE

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

PCB ERROR CODE

PCB MAIN

Next: End

OVERHEAT

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

OVERHEAT

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

PUMP NOT RUNNING FAULT CODE 101

PCB MAIN

Next: End

PUMP NOT RUNNING FAULT CODE 101

CABLE - PUMP TACO

Next: End

OVERHEAT

PUMP 5M PWM TACO

Next: End

PUMP OVERRUN NOT WORKING

PCB MAIN

Next: End

OVERHEAT

EXCHANGER (MAIN)

Next: End

OVERHEAT

BY-PASS

Next: End

OVERHEAT

WATER FILTER

Next: End

OVERHEAT ERROR CODE

TEMPERATURE PROBE FITMENT

Next: End

OVERHEAT 101 ERROR

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

OVERHEAT ERROR 101

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

QADAI

GAS VALVE

Next: End

QADAI PUMP RESISTANCE

PUMP 5M PWM TACO

Next: End

QADAI FAN RESISTANCE

FAN ASSEMBLY

Next: End

QADAI

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

QADAI

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

QADAI GAS VALVE VOLTAGE

PCB MAIN

Next: End

QADAI PUMP VOLTAGE

PCB MAIN

Next: End

QADAI

REED SENSOR

Next: End

QADAI

MOTOR - 3 WAY VALVE

Next: End

QADAI STEPPER

PCB MAIN

Next: End

CODE 3P9

PCB MAIN

Next: End

FAULT CODE 109

PARAMETER DEVICE INDICATOR FOR HEATING CIRCUIT PRESSURE

Next: End

ERROR CODE 116

UNDERFLOOR HEATING THERMOSTAT

Next: End

ERROR CODE 102

PARAMETER DEVICE INDICATOR FOR HEATING CIRCUIT PRESSURE

Next: End

PUMP NOT RUNNING

PCB MAIN

Next: End

PUMP NOT RUNNING

CABLE - PUMP TACO

Next: End

PUMP DOES NOT RUN

PUMP 5M PWM TACO

Next: End

NO FAN VOLATGE

PCB MAIN

Next: End

FAN NOT RUNNING

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

FAN NOT RUNNING

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

ERROR CODE 612

PCB MAIN

Next: End

ERROR CODE 604 / 612

PCB MAIN

Next: End

FUSE GONE

TIMECLOCK

Next: End

FUSE INVESTIGATION

GAS VALVE

Next: End

USER DISPLAY GUIDE

Z REDIRECTION

Next: End

DOES NOT RESPOND TO CH DEMAND

PCB MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 6

PCB MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 5

PCB MAIN

Next: End

BURNER IGNITES BUT BAFFLES

CONDENASTE TRAP

Next: End

NOT RESPONDING TO CH

PCB MAIN

Next: End

NOT RESPONDING TO CH 1

PCB MAIN

Next: End

NOT RESPONDING TO CH 2

PCB MAIN

Next: End

ON WITH NO DEMAND

CABLE - PUMP TACO

Next: End

FIRES WITH NO DEMAND

PROBE - TEMPERATURE - C/W CLIP KIT (FLOW)

Next: End

FIRES WITH NO DEMAND

PROBE - TEMPERATURE - C/W CLIP KIT (RETURN)

Next: End

ON WITH NO DEMAND EBUS

PCB MAIN

Next: End

ON WITH NO DEMAND

PCB MAIN

Next: End

MAGNET STUCK ON NO DEMAND

FLOW METER MAGNET

Next: End

DHW ON WITH NO DEMAND

PCB MAIN

Next: End

FAULT CODE HISTORY

Z REDIRECTION

Next: End

NO PRESSURE DROP OBSERVED

GAS VALVE

Next: End

BURENR DOES NOT IGNITE 1

SILENCER

Next: End

SET INCORRECTLY START UP

PARAMETER APPLIANCE VERSION

Next: End

NO POWER TO DIVERTER MOTOR

PCB MAIN

Next: End

OPEN CIRCUIT MOTOR NOT MOVING TO CH POSITION

3- WAY VALVE CABLE (DIVERTER STEPPER / REED SWITCH AND LWPS HARNESS)

Next: End

SEIZED

MOTOR - INCLUDING 3 WAY SPRING VALVE KIT

Next: End

REACHES TEMP RADS COOL

BY-PASS

Next: End

REACHES TEMP RADS COOL

WATER FILTER

Next: End

NO VOLTAGE TO DIVERTER MOTOR

PCB MAIN

Next: End

OPEN CIRCUIT MOTOR NOT MOVING TO DHW POSITION

3- WAY VALVE CABLE (DIVERTER STEPPER / REED SWITCH AND LWPS HARNESS)

Next: End

RADS HEATING WITH DH DEMAND

MOTOR - INCLUDING 3 WAY SPRING VALVE KIT

Next: End

BURNER IGNITES BUT BAFFLES

SILENCER

Next: End

BURNER DOES NOT IGNITE

CONDENASTE TRAP

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

BURNER DOES NOT IGNITE 1

IGNITION ELECTRODE

Next: End

BURNER DOES NOT IGNITE

VENTURI

Next: End

BURNER ESTABLISHES THEN BAFFLES

GAS PRESSURE INLET

Next: End

REACHES TEMP RADS COOL

SYSTEM PRESSURE

Next: End

EXCESSIVE SYSTEM PRESSURE RISE

VESSEL - EXPANSION

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

ERROR CODE 114

PCB MAIN

Next: End

FAULT CODE 114

PCB MAIN

Next: End

ERROR CODE 303 RESETS CONFIRM BOILER OP

Z REDIRECTION

Next: End

ERROR CODE 302

PCB - DISPLAY

Next: End

ERROR CODES

Z REDIRECTION

Next: End

NO DISPLAY

Next: End

FUSE FURTHER INVESTIGATION

Z REDIRECTION

Next: End

TEMP PROBE ERRPR CODE

PCB MAIN

Next: End

ERROR CODE 110

PCB MAIN

Next: End

BURNER DOES NOT IGNITE 2

PCB MAIN

Next: End

POOR FLOW RATE

SANITARY HEAT EXCHANGER

Next: End

PASSING

MOTOR - INCLUDING 3 WAY SPRING VALVE KIT

Next: End

POOR FLOW RATE

FLOW METER (DHW FILTER)

Next: End

SEIZED FAULT CODE 102

PUMP 5M PWM TACO

Next: End

CIRCULATION ISSUES

SANITARY HEAT EXCHANGER

Next: End

CIRCULATION ERROR CODES

PCB MAIN

Next: End

CIRCULATION ISSUES

Next: End

NOT SENSING DEMAND

PCB MAIN

Next: End

ERROR CODE 502

PCB MAIN

Next: End

BURNER DOES NOT IGNITE

GAS VALVE

Next: End

FUSE FURTHER INVESTIGATION 1

Z REDIRECTION

Next: End

FAULT CODE 108

PCB MAIN

Next: End

DHW DEMAND NOT RECOGNISED

REED SENSOR

Next: End

ERROR CODE 201 OR 203

PCB MAIN

Next: End

ERROR CODE 108

LOW PRESSURE SWITCH

Next: End

FAULT CODE 108

PUMP MANIFOLD

Next: End

FAULT CODE 108

LOW PRESSURE SWITCH

Next: End

BURNER DOES NOT IGNITE

IGNITION ELECTRODE

Next: End

BURNER DOES NOT IGNITE

EARTH WIRE

Next: End

NOT SPARKING

PCB MAIN

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

PCB MAIN

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

DOES NOT ESTABLISH

EXCHANGER (MAIN)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

VENTURI

Next: End

BURNER IGNITES BUT BAFFLES

BURNER

Next: End

BURNER IGNITES BUT BAFFLES

EXCHANGER (MAIN)

Next: End

BURNER IGNITES BUT BAFFLES

VENTURI

Next: End

POOR FLOW RATE

FLOW METER MAGNET

Next: End

DHW TOO HOT

PCB MAIN

Next: End

POOR DHW TEMP RISE

SANITARY HEAT EXCHANGER

Next: End

POOR DHW TEMP RISE

EXCHANGER (MAIN)

Next: End

POOR DHW TEMP RISE

PCB MAIN

Next: End

FAILED GAS RATE POOR DHW TEMP

VENTURI

Next: End

FAILED GAS RATE POOR DHW TEMP

FAN ASSEMBLY

Next: End

FAILED GAS RATE POOR DHW TEMP

GAS VALVE

Next: End

FAILED GAS RATE POOR DHW

BURNER

Next: End

FAILED GAS RATE POOR DHW TEMP

EXCHANGER (MAIN)

Next: End

DHW RUNS HOT THEN COLD

PCB MAIN

Next: End

RESTRICTED DHW RUNS HOT THEN COLD

SANITARY HEAT EXCHANGER

Next: End

RESTRICTED DHW RUNS HOT THEN COLD

EXCHANGER (MAIN)

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

PCB MAIN

Next: End

FUSE INVESTIGATION

CABLE FAN

Next: End

FUSE INVESTIGATION

PUMP 5M PWM TACO

Next: End

ERROR CODE 110

NTC - CABLE

Next: End

ERROR CODE 112

NTC - CABLE

Next: End

OVERHEAT

PCB MAIN

Next: End

SEIZED FAULT CODE 101

PUMP 5M PWM TACO

Next: End

OVERHEAT

SANITARY HEAT EXCHANGER

Next: End

OVERHEAT

Next: End

OVERHEAT FAULT CODE

OVERHEAT

Next: End

FAULT CODE 101

PCB MAIN

Next: End

OVERHEAT 101

PCB MAIN

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

SENSOR TEMP RETURN

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE

RESULT AS EXPECTED

Next: End

FAN RESISTANCE

RESULT AS EXPECTED

Next: End

REED SENSOR

RESULT AS EXPECTED

Next: End

STEPPER RESISTANCE

RESULT AS EXPECTED

Next: End

STEPPER VOLTAGE

RESULT AS EXPECTED

Next: End

CODE 3P9

MAINTENANCE INTERVAL SURPASSED

Next: End

ERROR 109

PCB MAIN

Next: End

ERROR CODE 102

PCB MAIN

Next: End

SEIZED

PUMP 5M PWM TACO

Next: End

PUMP DOES NOT RUN

PCB MAIN

Next: End

FAN DOES NOT RUN

FAN ASSEMBLY

Next: End

FAN NOT RUNNING

PCB MAIN

Next: End

FAULT CODE 612

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION

PCB - MAIN (FUSE BLOWN)

Next: End

FUSE INVESTIGATION

CABLE GAS VALVE

Next: End

DOES NOT RESPOND TO CH DEMAND

EBUS CONTROLS

Next: End

DOES NOT RESPOND TO CH

Next: End

DOES NOT RESPOND TO CH DEMAND 2

PCB MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 2

EBUS CONTROLS

Next: End

DOES NOT RESPOND TO CH 2

Next: End

DOES NOT RESPOND TO CH DEMAND 4

PCB MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 1

EBUS CONTROLS

Next: End

DOES NOT RESPOND TO CH 1

Next: End

DOES NOT RESPOND TO CH DEMAND 3

PCB MAIN

Next: End

NOT RESPONDING TO CH

TIMECLOCK

Next: End

NOT RESPONDING TO CH 1

TIMECLOCK

Next: End

NOT RESPONDING TO CH 2

TIMECLOCK

Next: End

NO DEMAND SHOWING BUT PUMP RUNNING

PCB MAIN

Next: End

APPLIANCE FIRES WITH NO DEMAND

FROST PROTECTION

Next: End

FIRES WITH NO DEMAND 1

PCB MAIN

Next: End

ON WITH NO DEMAND

EBUS CONTROLS

Next: End

CH ON WITH NO DEMAND

Next: End

DRIPPING TAP

DHW SYSTEM

Next: End

ON WITH NO DEMAND

REED SENSOR

Next: End

BAFFLES OR IS NOISY

GAS VALVE

Next: End

BURNER DOES NOT IGNITE 1

CABLE GAS VALVE

Next: End

BURNER DOES NOT IGNITE 1

GAS VALVE

Next: End

DOES NOT IGNITE

BURNER

Next: End

BURNER DOES NOT IGNITE 1

EXCHANGER (MAIN)

Next: End

BURNER DOES NOT IGNITE 1

VENTURI

Next: End

BLANK DISPLAY

PCB - DISPLAY

Next: End

---- ON DISPLAY

PCB MAIN

Next: End

NOT MOVING TO CH POSITION

MOTOR - 3 WAY VALVE

Next: End

BOILER UP TO TEMP RADS COOL

Next: End

NOT MOVING TO DHW POSITION

MOTOR - 3 WAY VALVE

Next: End

BURNER DOES NOT IGNITE

GAS PRESSURE INLET

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

DOES NOT IGNITE

IGNITION ELECTRODE

Next: End

EXCESSIVE PRESSURE RISE

PIPE - EXPANSION VESSEL

Next: End

ERROR CODE 114

EXTERNAL SENSOR

Next: End

FAULT CODE 116

PCB MAIN

Next: End

ERROR CODE 116

PCB MAIN

Next: End

ERROR CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION APPLIANCE SELF CHECK

Next: p1098

DISPLAY DOES NOT OPERATE

CHARACTERISTIC TEST FROM OBSERVATION APPLIANCE SELF CHECK

Next: p1102

APPLIANCE REACHES TEMP RADIATORS REMAIN COOL OR DO NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p156

APPLIANCE AND RADIATORS FAIL TO REACH SET TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p771

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2004

TEMPERATURE RISE UNSATISFACTORY, RADIATORS REMAIN COOL

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2006

TEMPERATURE RISE UNSATISFACTORY, RADIATORS HEAT WITH NO DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2008

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2010

FILTER RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW METER ASSEMBLY

Next: !p2238

MAGNET RESTRICTED, BLOCKED OR JAMMED

CHARACTERISTIC TEST FROM INSPECTION FLOW METER ASSEMBLY

Next: !p3507

APPLIANCE DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4047

PUMP RUNS OR APPLIANCE ATTEMPS TO FIRE

CHARACTERISTIC TEST FROM OBSERVATION APPLIANCE SELF CHECK

Next: p4125

PUMP MANIFOLD BLOCKED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND MANIFOLD

Next: !p3424

LOW PRESSURE SENSOR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND MANIFOLD

Next: !p3426

IGNITION ELECTRODE AND LEAD UNSATISFACTORY

CHARACTERISTIC TEST FROM RESISTANCE IGNITION ELECTRODE, LEAD AND EARTH WIRE

Next: !p3431

EARTH WIRE UNSATISFACTORY

CHARACTERISTIC TEST FROM RESISTANCE IGNITION ELECTRODE, LEAD AND EARTH WIRE

Next: !p3433

BURNER RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP

Next: !p3468

HEAT EXCHANGER FLUEWAYS RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p3470

AIR / GAS MIXER (VENTURI) RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p3472

BURNER RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP

Next: !p3476

HEAT EXCHANGER FLUEWAYS RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p3478

AIR / GAS MIXER (VENTURI) RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p3480

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM RESISTANCE IGNITION ELECTRODE, LEAD AND EARTH WIRE

Next: p3570

APPLIANCE DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3949

AIR GAS MIXER RESTRICTED AND / OR BLOCKED / IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER AND FAN ASSEMBLY

Next: !p3590

FAN RESTRICTED AND / OR BLOCKED / IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER AND FAN ASSEMBLY

Next: !p3592

BURNER RESTRICTED / BLOCKED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND PRIMARY HEAT EXCHANGER FLUEWAYS

Next: !p3604

HEAT EXCHANGER FLUEWAYS RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p3606

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM RESISTANCE IGNITION ELECTRODE, LEAD AND EARTH WIRE

Next: p3618

APPLIANCE DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4029

APPLIANCE CONTINUES TO HEAT BEYOND 82 °C

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p3722

APPLIANCE OVERHEATS BEFORE 82 °C IS REACHED

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: p3727

CH DEMAND ACTIVATED

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY

Next: p4128

FROST PROTECTION ACTIVATED

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY

Next: p4130

NO DEMAND SHOWING

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY

Next: p4132

BURNER RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP

Next: !p4178

HEAT EXCHANGER FLUEWAYS RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p4180

AIR / GAS MIXER (VENTURI) RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

Next: !p4182

-- -- ON DHW SIDE OF THE DISPLAY

CHARACTERISTIC TEST FROM OBSERVATION APPLIANCE SELF CHECK

Next: p4187

NO PRESSURE DROP OBSERVED

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: p496

INLET PRESSURE LOW OR DIES AWAY DURING IGNITION

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: !p498

BURNER RESTRICTED AND / OR IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP

Next: !p521

SPARK GAP UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION BURNER AND SPARK GAP

Next: !p523

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p445

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p75

BURNER IGNITES AND ESTABLISHES BUT BAFFLES OR IS NOISY

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p396

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p878

01/06/2023 15:28:03 2211_1_50_1 21/06/2023 10:41:52

05/06/2023 14:51:31

Next: End

RESISTANCE HARNESS FAN

REMOVE THE CONNECTOR FROM THE FAN

Next: p1007, !f1008

RESET APPLIANCE - ERROR CODE 304

Next: !p1061, !f1062

VOLTAGE TO DISPLAY PCB

{GAINPCBACS}
REMOVE DISPLAY HARNESS CONNECTOR (5 BLUE WIRE) FROM
THE MAIN PCB AND MAKE SAFE

Next: p1079, !f1080

RESISTANCE FUSE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1105, f1106

FUSE FURTHER INVESTIGATION (FUSED SPUR)

Next: !p1107, !f1108

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p1167, f1168

RESISTANCE RETURN TEMPERATURE PROBE

REMOVE THE SIDE PANEL
REMOVE THE LEADS FROM THE RETURN TEMPERATURE PROBE (BLUE LEADS)

Next: !p3679, !f3681

RESISTANCE FLOW TEMPERATURE PROBE

REMOVE THE LEADS FROM THE FLOW TEMPERATURE PROBE (REDS LEADS)

Next: !p3678, !f3680

INSPECTION DHW ISOLATION VALVE

Next: p1992, !f1993

RESISTANCE HARNESS FAN

REMOVE THE CONNECTOR FROM THE FAN

Next: p2022, !f2023

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p2261, !f2262

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p2512, !f2513

INSPECTION INTERNAL BYPASS

APPLIANCE DRAINED AN

Next: p2516, !f2517

VOLTAGE DHW REED SENSOR - DEMAND

{GAINPCBACS}

Next: !p2523, f2524

RESISTANCE REED SENSOR HARNESS

DISCONNECT THE CONNECTOR FROM THE REED SENSOR

Next: p3393, !f3396

OBSERVATION RESET APPLIANCE - OVERHEAT

ENSURE APPLIANCE IS COOL

Next: p2571, f3693

FUSE FURTHER INVESTIGATION (PCB FUSE)

Next: !p3116, !f3117

OBSERVATION SYSTEM PRESSURE

Next: p3204, !f3205

OBSERVATION CHECK PARAMETER 2-2-8 APPLIANCE VERSION

Next: !p3403, !f3404

RESISTANCE LOW PRESSURE SWITCH HARNESS

REMOVE / LOOSEN RIGHT HAND SIDE PANEL
DISCONNECT THE CONNECTOR FROM THE WATER PRESSURE SWITCH

Next: p3421, !f3427

RESISTANCE IGNITION ELECTRODE, LEAD AND EARTH WIRE

REMOVE THE IGNITION

Next: !p3434, ?3430, ?3432

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3568, ?3569, ?3571

INSPECTION SILENCER

REMOVE THE SILENCER

Next: p3581, !f3582

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3616, ?3617, ?3619

RESISTANCE FAN AND HARNESS - FUSE INVESTIGATION

REMOVE CONNECTOR CN11 FROM THE PCB

Next: p3662, f3663

RESISTANCE FAN - FUSE INVESTIGATION

REMOVE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3664, !f3665

RESISTANCE HARNESS PUMP

UNPLUG THE ELECTRICAL CONNECTOR FROM THE PUMP ASSEMBLY

Next: !p3668, !f3669

RESISTANCE FLOW TEMPERATURE PROBE

REMOVE THE LEADS FROM THE FLOW TEMPERATURE PROBE (REDS LEADS)

Next: p3694, !f3695

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3701, !f3702

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3711, !f3712

INSPECTION INTERNAL BYPASS

APPLIANCE DRAINED AN

Next: p3715, !f3716

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: !p3734, !f3764

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3738, !f3765

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p3742, !f3743

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
REMOVE GAS VALVE CONNECTOR FROM THE PCB AND MAKE SAFE

Next: !p3746, !f3766

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR CN22 FROM THE PCB

Next: !p3750, !f3751

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p3754, !f3767

RESISTANCE FAN

REMOVE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3758, !f3759

VOLTAGE DHW REED SENSOR - DEMAND

{GAINPCBACS}

Next: !p3762, !f3768

RESISTANCE STEPPER MOTOR AND HARNESS (QADAI)

REMOVE CONNECTOR CN31 FROM THE PCB

Next: !p3771, !f3772

VOLTAGE STEPPER MOTOR

{GAINPCBACS}

Next: !p3775, !f3776

OBSERVATION HAS THE MAINTENANCE INTERVAL SURPASSED

Next: !p3779, !f3780

OBSERVATION CHECK PARAMETER 2-4-7 LOW WATER PRESSURE DEVICE

Next: !p3783, !f3784

OBSERVATION CHECK PARAMETER 2-4-7 LOW WATER PRESSURE DEVICE

Next: !p3788, !f3789

DISCONNECT PUMP SPEED CONTROL CONNECTOR

{GAINPCBACS}
REMOVE CONNECTOR CN25 (PUMP SPEED CONTROL) FROM THE PCB AND MAKE SAFE

Next: p3796, f3799

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3800, !f3801

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p3860, !f3861

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p3913, !f3914

DISCONNECT EXTERNAL CONTROLS (BUS)

REMOVE CONNECTOR BUS FROM THE PCB

Next: !p3952, !f3953

OBSERVATION INTERNAL CLOCK FITTED

Next: !p4016, f4107

DISCONNECT EXTERNAL CONTROLS (BUS)

REMOVE CONNECTOR BUS FROM THE PCB

Next: !p4032, !f4033

OBSERVATION INTERNAL CLOCK FITTED

Next: !p4036, f4110

DISCONNECT EXTERNAL CONTROLS (BUS)

REMOVE CONNECTOR BUS FROM THE PCB

Next: !p4050, !f4051

OBSERVATION INTERNAL CLOCK FITTED

Next: !p4054, f4113

BYPASS INTERNAL CLOCK

GAIN ACCESS TO INTER

Next: !p4108, !f4109

BYPASS INTERNAL CLOCK

GAIN ACCESS TO INTER

Next: !p4111, !f4112

BYPASS INTERNAL CLOCK

GAIN ACCESS TO INTER

Next: !p4114, !f4115

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p4137, !f4138

DISCONNECT EXTERNAL CONTROLS (BUS) - SELF CHECK

REMOVE CONNECTOR BUS

Next: !p4143, !f4144

OBSERVATION REMOVE REED SENSOR CONNECTOR

REMOVE CONNECTOR FROM THE REED SENSOR AND MAKE SAFE

Next: p4162, !f4165

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p4170, !f4171

INSPECTION DIVERTER VALVE BODY

ROTATE THE LOCKING R

Next: p4204, !f4209

INSPECTION DIVERTER VALVE BODY

ROTATE THE LOCKING R

Next: p4192, !f4197

RESISTANCE GAS VALVE HARNESS

REMOVE GAS VALVE CONNECTOR FROM THE PCB
REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: p1943, !f1944

OBSERVATION TEMPERATURE PROBES CORRECTLY FITTED

Next: p1372, !f1373

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: !p1171, f1172

OBSERVATION EXTERNAL SENSOR

{GAINPCBACS}

Next: p969, !f970

OBSERVATION UNDERFLOOR HEATING

Next: p975, f976

RESISTANCE UNDERFLOOR HEATING THERMOSTAT LINK

{GAINPCBACS}
REMOVE UNDERFLOOR HEATING CONNECTOR MARKED TA2 / FLOOR

Next: !p977, !f3638

INSTALLATION TIGHTNESS TEST

Next: p1776, !f1778

RESISTANCE FAN

REMOVE CONNECTOR FROM THE FAN ASSEMBLY

Next: p3688, !f3167

RESISTANCE HARNESS DISPLAY PCB

DISCONNECT THE DISPL

Next: !p1086, !f1091

ERROR CODES

Next: !p1099, !f1100

VOLTAGE MAINS POWER INPUT AT PCB

{GAINPCBACS}

Next: p1103, f1104

RESISTANCE FUSE PCB

REMOVE FUSE FROM PCB

Next: p3288, f3115

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p1374, !f1375

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: p1376, !f1377

OBSERVATION SYSTEM PRESSURE

Next: p2947, !f2969

OBSERVATION PUMP RUNS

Next: p1380, f2260

PUMP LIMPET

Next: p2509, !f2520

OBSERVATION SYSTEM PRESSURE

Next: p800, !f812

PRESSURE STANDING RETURN

ATTACH PRESSURE GAUG

Next: p2971, !f2972

RESISTANCE GAS VALVE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1945, !f1946

OBSERVATION COLD WATER SUPPLY

Next: p1994, !f1995

INSPECTION FLOW METER ASSEMBLY

ISOLATE THE COLD WAT

Next: !p1996, ?2237, ?2239

RESISTANCE FLOW TEMPERATURE PROBE

REMOVE THE LEADS FROM THE FLOW TEMPERATURE PROBE (REDS LEADS)

Next: p3508, !f3509

OBSERVATION SYSTEM PRESSURE

Next: p3513, !f3597

OBSERVATION STEPPER MOTOR OPERATION - DHW POSITION

Next: !p2137, f4190

OBSERVATION SYSTEM PRESSURE

Next: p2075, !f2092

RESISTANCE FAN

REMOVE CONNECTOR FROM THE FAN ASSEMBLY

Next: p3382, !f3391

OBSERVATION TEMPERATURE PROBES CORRECTLY FITTED

Next: p3607, !f3627

OBSERVATION STEPPER MOTOR OPERATION - CH POSITION

Next: p4199, f4191

RESISTANCE HARNESS PUMP

UNPLUG THE ELECTRICAL CONNECTOR FROM THE PUMP ASSEMBLY

Next: !p2263, !f2264

PUMP LIMPET

Next: p2921, !f2935

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p1378, !f2433

TEMPERATURE DIFFERENTIAL SECONDARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p2510, f2511

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p2514, f2515

INSPECTION CH FILTER

APPLIANCE DRAINED AN

Next: !p2518, !f2519

OBSERVATION SYSTEM PRESSURE

Next: p2572, !f2573

OBSERVATION SYSTEM PRESSURE RISE

Next: p2574, !f2575

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p2609, !f2637

OBSERVATION TEMPERATURE PROBES CORRECTLY FITTED

Next: p3698, !f3725

INSPECTION EXTERNAL BYPASS

Next: p2143, !f2936

OBSERVATION SYSTEM PRESSURE RISE

Next: p2412, !f2970

RESISTANCE IGNITION ELECTRODE AND LEAD

REMOVE THE IGNITION ELECTRODE FROM THE BURNER DOOR
DISCONNECT THE IGNITION LEAD FROM THE PCB

Next: !p2973, !f3636

INSPECTION FLUE

Next: p504, !f2995

RESISTANCE IGNITION ELECTRODE AND LEAD

REMOVE THE IGNITION ELECTRODE FROM THE BURNER DOOR
DISCONNECT THE IGNITION LEAD FROM THE PCB

Next: p3436, !f3451

OBSERVATION SYSTEM PRESSURE RISE

Next: p3206, !f3207

RESISTANCE LOW PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR CN31 FROM THE PCB

Next: p3208, f3420

OBSERVATION CHECK PARAMETER 2-4-7 LOW WATER PRESSURE DEVICE

Next: !p3220, !f3221

VOLTAGE TO DISPLAY PCB

{GAINPCBACS}
REMOVE DISPLAY HARNESS CONNECTOR (5 BLUE WIRE) FROM
THE MAIN PCB AND MAKE SAFE

Next: p3289, !f3290

RESISTANCE HARNESS DISPLAY PCB

DISCONNECT THE DISPL

Next: !p4184, !f3292

VOLTAGE FAN

{GAINPCBACS}
ENSURE NO DEMANDS

Next: p3848, !f3849

INSPECTION FLOW METER MAGNET

ISOLATE THE COLD WAT

Next: !p3394, !f3506

INSPECTION LOW PRESSURE SWITCH AND MANIFOLD

APPLIANCE DRAINED AN

Next: !p3422, ?3423, ?3425

INSPECTION SILENCER

REMOVE THE SILENCER

Next: p3437, !f3438

INSPECTION FLUE

Next: p3439, !f3440

INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

REMOVE BURNER DOOR ASSEMBLY C/W FAN AND AIR / GAS MIXER

Next: !p3466, ?3467, ?3469, ?3471

INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

REMOVE BURNER DOOR ASSEMBLY C/W FAN AND AIR / GAS MIXER

Next: !p4168, ?3475, ?3477, ?3479

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3510, !f3511

OBSERVATION MAXIMUM DHW POWER - PARAMETER 2-3-2

Next: p3557, !f3598

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p3558, !f3559

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: p3560, !f3561

PUMP LIMPET

Next: p3562, !f3563

TEMPERATURE COMPARISON OF HOT WATER - EXTERNAL MIXING TEST

Next: p3564, !f3565

TEMPERATURE DIFFERENTIAL SECONDARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3566, f3567

APPLIANCE OUTPUT

TURN HOT WATER TAP O

Next: !p3579, f3580

INSPECTION CH FILTER

APPLIANCE DRAINED AN

Next: !p3577, !f3578

INSPECTION FLUE

Next: p3583, !f3584

INSPECTION CONDENSATE PIPE

Next: p3585, !f3586

INSPECTION AIR / GAS MIXER AND FAN ASSEMBLY

REMOVE FAN AND AIR / GAS MIXER (VENTURI)

Next: p3587, ?3589, ?3591

INSPECTION BURNER AND PRIMARY HEAT EXCHANGER FLUEWAYS

THE BURNER DOOR ASSEMBLY SHOULD ALREADY BE REMOVED FROM PREVIOUS TEST

Next: !p3602, ?3603, ?3605

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p3608, !f3609

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: p3610, !f3611

PUMP LIMPET

Next: p3612, !f3613

TEMPERATURE DIFFERENTIAL SECONDARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: !p3614, f3615

INSPECTION CH FILTER

APPLIANCE DRAINED AN

Next: !p3625, !f3626

OBSERVATION MAXIMUM HEATING POWER - PARAMETER 2-3-1

Next: p3629, !f3630

RESISTANCE FLOW TEMPERATURE PROBE AND HARNESS

REMOVE 8 PIN CONNECTOR FROM THE PCB

Next: p3631, !f3632

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3633, !f3634

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR CN22 FROM THE PCB

Next: p3666, f3667

RESISTANCE GAS VALVE AND HARNESS

REMOVE GAS VALVE CONNECTOR FROM THE PCB

Next: p3909, f3912

VOLTAGE FAN

{GAINPCBACS}
ENSURE NO DEMANDS

Next: p3864, !f3865

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3696, !f3697

OBSERVATION PUMP RUNS

Next: p3699, f3700

PUMP LIMPET

Next: p3705, !f3706

RESISTANCE HARNESS PUMP

UNPLUG THE ELECTRICAL CONNECTOR FROM THE PUMP ASSEMBLY

Next: !p3703, !f3704

OBSERVATION PUMP OVERRUN

Next: p3707, !f3708

TEMPERATURE DIFFERENTIAL SECONDARY HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3709, f3710

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

ATTACH TEMPERATURE C

Next: p3713, f3714

OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE

Next: !p3719, ?3721, ?3723

INSPECTION CH FILTER

APPLIANCE DRAINED AN

Next: !p3717, !f3718

RESISTANCE FLOW TEMPERATURE PROBE

REMOVE THE LEADS FROM THE FLOW TEMPERATURE PROBE (REDS LEADS)

Next: p3728, !f3729

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3730, !f3731

VOLTAGE PUMP - CONTROL VOLTAGE

{GAINPCBACS}
ENSURE NO DEMANDS PRESENT

Next: !p3805, !f3806

RESISTANCE HARNESS PUMP

UNPLUG THE ELECTRICAL CONNECTOR FROM THE PUMP ASSEMBLY

Next: !p3802, !f3803

VOLTAGE FAN DEMAND

Next: !p3850, f3859

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p3862, !f3863

VOLTAGE FAN DEMAND

Next: !p3867, !f3868

RESISTANCE INTERNAL TIMECLOCK - FUSE INVESTIGATION

GAIN ACCESS TO INTERNAL TIMECLOCK

Next: !p3910, !f3911

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

{GAINPCBACS}

Next: p3950, f3951

BYPASS EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p3954, f4004

INSPECTION CONDENSATE PIPE

Next: p77, !f410

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

{GAINPCBACS}

Next: p4030, f4031

BYPASS EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4034, f4035

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

{GAINPCBACS}

Next: p4048, f4049

BYPASS EXTERNAL CONTROLS

REMOVE ALL EXTERNAL

Next: !p4052, f4053

OBSERVATION DISPLAY

ENSURE NO DEMANDS

Next: p4126, ?4127, ?4129, ?4131

OBSERVATION ISOLATE COLD FEED TO APPLIANCE

ISOLATE THE COLD MAINS SUPPLY
(TURN THE LEVER 90° CLOCKWISE UNTIL HORIZONTAL)

Next: !p4151, f4152

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED

{GAINPCBACS}

Next: p4141, f4142

TEMPERATURE FLOW

ATTACH A TEMPERATURE CLAMP TO THE FLOW PIPE

Next: !p4135, f4136

RESISTANCE HARNESS PUMP MODULATION

UNPLUG THE ELECTRICAL CONNECTOR FROM THE PUMP ASSEMBLY

Next: !p4133, !f4134

RESISTANCE RETURN TEMPERATURE PROBE AND HARNESS

REMOVE 8 WIRE CONNECTOR FROM THE PCB

Next: !p4139, !f4140

DISCONNECT EXTERNAL CONTROLS (TA1)

REMOVE CONNECTOR TA1 FROM THE PCB
ENSURE NO DEMANDS ARE PRESENT

Next: !p4145, !f4159

INSPECTION FLOW METER MAGNET

ISOLATE THE COLD WAT

Next: !p4163, !f4164

INSPECTION SILENCER

REMOVE THE SILENCER

Next: p4173, !f4174

INSPECTION AIR / GAS MIXER, BURNER AND HEAT EXCHANGER FLUEWAYS

REMOVE BURNER DOOR ASSEMBLY C/W FAN AND AIR / GAS MIXER

Next: !p4175, ?4177, ?4179, ?4181

OBSERVATION CHECK PARAMETER 2-2-8 APPLIANCE VERSION (-- -- ON DHW SIDE OF DISPLAY)

Next: !p4188, !f4189

VOLTAGE STEPPER MOTOR

{GAINPCBACS}

Next: p4193, !f4194

RESISTANCE HARNESS DIVERTER MOTOR

DISCONNECT THE ELECTRICAL CONNECTOR FROM THE DIVERTER MOTOR

Next: !p4195, !f4196

INSPECTION INTERNAL BYPASS

APPLIANCE DRAINED AN

Next: p4200, !f4201

INSPECTION CH FILTER

APPLIANCE DRAINED AN

Next: !p4202, !f4203

VOLTAGE STEPPER MOTOR

{GAINPCBACS}

Next: p4205, !f4206

RESISTANCE HARNESS DIVERTER MOTOR

DISCONNECT THE ELECTRICAL CONNECTOR FROM THE DIVERTER MOTOR

Next: !p4207, !f4208

INSPECTION FLUE

Next: p3473, !f3481

INSPECTION CONDENSATE PIPE

Next: p472, !f473

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
REMOVE GAS VALVE CONNECTOR FROM THE PCB AND MAKE SAFE

Next: p479, f499

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p503, ?495, ?497

INSPECTION FLUE

Next: p526, !f527

OBSERVATION SPARKING OCCURS

DISCONNECT THE IGNIT

Next: p2981, f3428

RESISTANCE IGNITION ELECTRODE AND LEAD

REMOVE THE IGNITION ELECTRODE FROM THE BURNER DOOR
DISCONNECT THE IGNITION LEAD FROM THE PCB

Next: p515, !f616

INSPECTION AIR / GAS MIXER

REMOVE AIR / GAS MIXER (VENTURI)

Next: p517, !f623

INSPECTION BURNER AND SPARK GAP

THE BURNER DOOR ASSEMBLY SHOULD ALREADY BE REMOVED FROM PREVIOUS TEST

Next: p519, ?520, ?522

INSPECTION PRIMARY HEAT EXCHANGER FLUEWAYS

THE BURNER DOOR ASSEMBLY SHOULD ALREADY BE REMOVED FROM PREVIOUS TEST

Next: !p2979, !f2980

RESISTANCE GAS VALVE AND HARNESS

REMOVE GAS VALVE CONNECTOR FROM THE PCB

Next: p4172, f4169

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE INLET TEST POINT

Next: p90, !f91

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE INLET TEST POINT

Next: p78, !f79

OBSERVATION SYSTEM PRESSURE

Next: p3628, !f3635

INSPECTION SILENCER

REMOVE THE SILENCER

Next: p422, !f428

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p2308, !f2322

PRESSURE EXPANSION VESSEL

APPLIANCE DRAINED AND DISCHARGED

Next: !p879, !f880

INSPECTION CONDENSATE PIPE

Next: p3123, !f3142

OBSERVATION TURN OFF EXTERNAL SENSOR IN PARAMETER 4-2-1

Next: !p971, !f972

RESISTANCE UNDERFLOOR HEATING THERMOSTAT

{GAINPCBACS}

Next: !p979, !f3785

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