XSol Diagnostic System

WORCESTER 24 CDI LPG

GLOBALLY REPLACED

Next: &21, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

RE-IGNITE DELAY

BOILER ON/OFF SWITCH ON

Next: &nff, !f177

OVERRUN OPERATION

Next: &1, !f176

CH MODULATION

ATTACH U-GAUGE TO OUTLET PRESSURE TEST POINT ON GAS VALVE
CH TEMPERATURE SELECTOR SET TO MAX

Next: &2, f173

EXCESSIVE SYSTEM PRESSURE RISE

CH TEMPERATURE SELECTOR SET TO MAX
ROOM THERMOSTAT (IF FITTED) CALLING

Next: &3, !f172

DHW MODULATION

ATTACH U-GAUGE TO OU

Next: &566, f162

AUTOMATIC FROST PROTECTION

CH TEMPERATURE SELECTOR IN OFF POSITION
DHW TEMPERATURE SELECTOR IN MIN POSITION

Next: &517, f140

GAS VALVE SOUNDNESS

Next: &8, !f184

CH BURNER IGNITES

CH TEMPERATURE SELEC

Next: &9, ?125, ?127, ?937

HIGH FLAME

ATTACH U-GAUGE TO GA

Next: &10, f214

DHW LOW FLAME

ATTACH U-GAUGE TO GA

Next: &11, f1043

DHW BURNER IGNITES

BOILER ON/OFF SWITCH ON

Next: &226, f107

DHW SPARKING

BOILER ON/OFF SWITCH ON

Next: &14, ?442, ?461

DHW FAN RUNS

BOILER ON/OFF SWITCH ON

Next: &15, ?71, ?486

DHW PUMP RUNS

Next: &16, f45

DHW DEMAND

REMOVE PLASTIC COVER FROM DIVERTER VALVE MICROSWITCH

Next: &17, f31

DHW FLOW RATE

Next: &18, f1026

WORCESTER 24 CDI LPG

G.C. NUMBER 47 311 3

Next: &720, !f22

OPERATIONAL SEQUENCE

NO LONGER USED

Next: &19, !f225

DHW BURNER ESTABLISHED (FLAME SENSE)

BOILER ON/OFF SWITCH ON

Next: &12, f227

DHW OPERATION

DHW TEMPERATURE SET TO MAX
BOILER ON/OFF SWITCH ON

Next: &6, ?518, ?520, ?522, ?524, ?526

CH OPERATION

ROOM THERMOSTAT (IF FITTED) CALLING

Next: &4, ?567, ?569, ?948

FAULT CODES

Next: &224, !f722

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &719, !f721

FAIL POINT A

Next: &nff, f724

FAIL POINT B

OUTSIDE MODEL

Next: &nff, f730

FAIL POINT C

OUTSIDE MODEL

Next: &nff, f736

FAIL POINT D

OUTSIDE MODEL

Next: &nff, f740

FAIL POINT E

OUTSIDE MODEL

Next: &nff, f751

FAIL POINT F

OUTSIDE MODEL

Next: &nff, f766

FAIL POINT G

OUTSIDE MODEL

Next: &nff, f772

FAIL POINT H - LINK TO DHW SPARKING

OUTSIDE MODEL

Next: &nff, !f838

FAIL POINT J

OUTSIDE MODEL

Next: &nff, f999

FAIL POINT I

OUTSIDE MODEL

Next: &nff, f842

FAIL POINT K

OUTSIDE MODEL

Next: &nff, f927

FUSE INVESTIGATION TREE

OUTSIDE MODEL

Next: &nff, f1092

FAIL POINT J - SHORTING APS

PIPE - AIR PRESSURE SWITCH

Next: End

FAIL POINT J - SHORTING APS

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

FAIL POINT J - FAN NOT RUNNING ON BOTH DEMANDS

HARNESS FAN

Next: End

FAIL POINT J - NOT SWITCHING

PRESSURE SWITCH - DIFFERENTIAL AIR

Next: End

FAIL POINT J - IGNORING APS SWITCHING

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT J - APS NOT SWITCHING

PIPE - AIR PRESSURE SWITCH

Next: End

FAIL POINT J - APS NOT SWITCHING

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

FAIL POINT J

FLUE

Next: End

DHW FLOW RATE

MAINS WATER SUPPLY

Next: End

DHW FLOW RATE

DHW FLOW ADJUSTER

Next: End

DHW FLOW RATE

FILTER STAINLESS STEEL

Next: End

DHW FLOW RATE

FLOW REGULATOR

Next: End

DHW BURNER ESTABLISHES - LEAD DAMAGED

PROBE - FLAME SENSOR C/W LEAD

Next: End

FLAME SENSE ELECTRODE

HARNESS MAIN

Next: End

DHW LOW FLAME

GAS INLET PRESSURE

Next: End

DHW LOW FLAME - BOSCH GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DHW LOW FLAME - DUNGS GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

HIGH FLAME - BOSCH GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

HIGH FLAME - DUNGS GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DHW BURNER IGNITES

SPARK ELECTRODE ASSEMBLY

Next: End

DHW PUMP RUNS

FUSE 1.25 AMP

Next: End

DHW PUMP RUNS

FUSE 2 AMP

Next: End

DHW PUMP RUNS

MAINS FUSE

Next: End

DHW SPARKING

FLUE RESTRICTOR

Next: End

FUSE INVESTIGATION

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY - SIFAN

Next: End

FUSE INVESTIGATION - GV MAIN

HARNESS MAIN

Next: End

FUSE INVESTIGATION - GV MODUREG

HARNESS MAIN

Next: End

FAIL POINT J

FLUE RESTRICTOR

Next: End

DHW BURNER IGNITES

GAS INLET PRESSURE

Next: End

FAULT CODE

THERMOSTAT - OVERHEAT - ELMWOOD

Next: End

CH BURNER IGNITES

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

AUTOMATIC FROST PROTECTION

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW MODULATION

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

EXCESSIVE SYSTEM PRESSURE RISE

EXPANSION VESSEL

Next: End

CH MODULATION

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

OVERRUN OPERATION

PCB -BOSCH HEATRONIC

Next: End

RE-IGNITE DELAY

PCB -BOSCH HEATRONIC

Next: End

GAS VALVE SOUNDNESS

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DHW BURNER IGNITES

PCB -BOSCH HEATRONIC

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL CHECKS

Next: End

SYSTEM

Next: End

NOT STAYING LIT

GAS INLET PRESSURE

Next: End

DHW BURNER ESTABLISHED

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DHW PUMP RUNS

DIVERTER VALVE SWITCH ASSEMBLY

Next: End

DHW DEMAND

KIT - DIAPHRAGM - REPLACEMENT

Next: End

INLET PRESSURE

GAS INLET PRESSURE

Next: End

DHW BURNER IGNITES

HARNESS MAIN

Next: End

DHW HIGH FLAME GAS VALVE MODULATING SOLENOID

HARNESS MAIN

Next: End

DHW HIGH FLAME

PCB -BOSCH HEATRONIC

Next: End

DIVERTER MICROSWITCH (OPEN)

HARNESS MAIN

Next: End

DHW SPARKING

PRESSURE SWITCH - DIFFERENTIAL AIR

Next: End

DHW SPARKING

SPARK ELECTRODE ASSEMBLY

Next: End

DHW SPARKING

HARNESS ASSEMBLY - IGNITION

Next: End

DHW SPARKING

PIPE - AIR PRESSURE SWITCH

Next: End

DHW SPARKING

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

DHW SPARKING

FLUE

Next: End

DHW RUNS HOT THEN COLD

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

DHW RUNS HOT THEN COLD

HEAT EXCHANGER - GAS TO WATER - INTER ALBION

Next: End

DHW TOO HOT

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW RUNS HOT COLD

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW RUNS HOT COLD

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

RADS DO NOT HEAT

ISOLATING VALVE 22MM GASCON

Next: End

RADS DO NOT HEAT

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

CH RADS COLD

DIVERTER VALVE ASSEMBLY

Next: End

NO FAN

HARNESS FAN

Next: End

DHW FAN RUNS

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW FAN RUNS

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW FAN RUNS

DIVERTER VALVE SWITCH ASSEMBLY

Next: End

DHW PUMP RUNS

TRANSFORMER - JUNKER

Next: End

DHW FAN RUNS DEMAND REMOVED

PIPE - AIR PRESSURE SWITCH

Next: End

DHW FAN RUNS FAN RUNS DEMAND REMOVED

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

HEAT EXCHANGER NOISY

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER - GAS TO WATER - INTER ALBION

Next: End

DHW COOL

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

DHW TOO COOL

HEAT EXCHANGER - GAS TO WATER - INTER ALBION

Next: End

DHW COOL RADS COOL

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

DHW COOL RADS COOL

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

CH NOISY

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

CH NOISY

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

FAULT CODES

Z REDIRECT

Next: End

FAIL POINT A

FUSE 2 AMP

Next: End

FAIL POINT A

Next: End

FAIL POINT B

TRANSFORMER - JUNKER

Next: End

FAIL POINT C

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT D - NEON FAULTY

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT E - NEON FAULTY

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT E

KIT - DIAPHRAGM - REPLACEMENT

Next: End

FAIL POINT E

DIVERTER VALVE SWITCH ASSEMBLY

Next: End

FAIL POINT F

FROST PROTECTION

Next: End

FAIL POINT F

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT G - RUNNING SLOW

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

FAIL POINT G

GAS INLET PRESSURE

Next: End

FAIL POINT G - DUNGS GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

FAIL POINT G

HEAT EXCHANGER - GAS TO WATER - INTER ALBION

Next: End

FAIL POINT G

PLATE HEAT EXCHANGER - INTER ALBION

Next: End

FAIL POINT G

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT G - NO PUMP OVERRUN

PCB -BOSCH HEATRONIC

Next: End

DHW FAN RUNS

PIPE - AIR PRESSURE SWITCH

Next: End

FAIL POINT G - NO POWER TO PUMP

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT H

Z REDIRECT

Next: End

DHW FAN RUNS

PROBE - AIR PRESSURE SENSING - FIRST PRESS

Next: End

FAIL POINT I

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT I

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT K

Z REDIRECT

Next: End

FAIL POINT G - BOSCH GV

GAS VALVE - MULTIFUNCTION - LPG

Next: End

CH OPERATION SHUTTING DOWN EARLY

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT B

FUSE 1.25 AMP

Next: End

CH BURNER IGNITES

Next: End

FAIL POINT D

Next: End

DHW SPARKS 1 SECOND

THERMOSTAT - OVERHEAT - ELMWOOD

Next: End

FAIL POINT G

PCB ADJUSTMENT

Next: End

CH CUTS OUT

KIT - THERMISTOR SENSOR - PRIMARY / DOMESTIC

Next: End

FAIL POINT J - SHORTING APS CIRCUIT

HARNESS MAIN

Next: End

FAIL POINT J - SHORTED

PRESSURE SWITCH - DIFFERENTIAL AIR

Next: End

FAIL POINT J - NOT RUNNING

FAN ASSEMBLY - SIFAN

Next: End

FAIL POINT J - NO POWER TO FAN

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT J - OPEN CIRCUIT ON APS

HARNESS MAIN

Next: End

FAIL POINT J - RUNNING SLOW

FAN ASSEMBLY - SIFAN

Next: End

DHW FLOW RATE

PLATE HEAT EXCHANGER - INTER ALBION

Next: End

DHW BURNER ESTABLISHED (FLAME SENSE)

PCB -BOSCH HEATRONIC

Next: End

DHW LOW FLAME - BOSCH GV

GAS VALVE ADJUSTMENT

Next: End

DHW LOW FLAME - DUNGS GV

GAS VALVE ADJUSTMENT

Next: End

HIGH FLAMED - BOSCH GV

GAS VALVE ADJUSTMENT

Next: End

HIGH FLAMED - DUNGS GV

GAS VALVE ADJUSTMENT

Next: End

DHW BURNER IGNITES

INJECTOR - MAIN BURNER - LPG

Next: End

DHW PUMP RUNS - F2

Z REDIRECT

Next: End

DHW PUMP RUNS - F1

Z REDIRECT

Next: End

ON / OFF SWITCH

PCB -BOSCH HEATRONIC

Next: End

DHW PUMP RUNS

Next: End

DHW PUMP RUNS - MAINS

Z REDIRECT

Next: End

FUSE INVESTIGATION

HARNESS FAN

Next: End

FUSE INVESTIGATION - MAIN

GAS VALVE - MULTIFUNCTION - LPG

Next: End

FUSE INVESTIGATION

PCB - FUSE INVESTIGATION

Next: End

FUSE INVESTIGATION - MODUREG

GAS VALVE - MULTIFUNCTION - LPG

Next: End

FAULT CODE

HARNESS MAIN

Next: End

BURNER IGNITES AT HIGH FLAME

PCB -BOSCH HEATRONIC

Next: End

TRANSFORMER RESISTANCE

PCB -BOSCH HEATRONIC

Next: End

AUTOMATIC FROST PROTECTION

PCB -BOSCH HEATRONIC

Next: End

DHW MODULATION

PCB -BOSCH HEATRONIC

Next: End

CH MODULATION

PCB -BOSCH HEATRONIC

Next: End

DHW BURNER IGNITES

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DIVERTER MICROSWITCH NO PUMP

HARNESS MAIN

Next: End

AIR PRESSURE SWITCH

HARNESS MAIN

Next: End

DHW DEMAND

DIVERTER VALVE SPINDLE

Next: End

DHW BURNER IGNITES SOLENOID RESISTANCE

GAS VALVE - MULTIFUNCTION - LPG

Next: End

DHW HIGH FLAME MOD SOLENOID

GAS VALVE - MULTIFUNCTION - LPG

Next: End

CH BURNER IGNITES

DIVERTER VALVE SWITCH ASSEMBLY

Next: End

DHW SPARKING APS

HARNESS MAIN

Next: End

DHW SPARKING

PCB -BOSCH HEATRONIC

Next: End

DHW SPARKING

FAN ASSEMBLY - SIFAN

Next: End

DHW OPERATION

DIVERTER VALVE ASSEMBLY

Next: End

DHW RUNS HOT THEN COLD

PLATE HEAT EXCHANGER - INTER ALBION

Next: End

DHW TOO HOT

PCB -BOSCH HEATRONIC

Next: End

RADS DO NOT HEAT

Next: End

PRIMARY SENSOR NO FAN

HARNESS MAIN

Next: End

DHW SENSOR NO FAN

HARNESS MAIN

Next: End

FAN DOES NOT RUN

PCB -BOSCH HEATRONIC

Next: End

DIVERTER MICROSWITCH NO FAN

HARNESS MAIN

Next: End

DHW FAN RUNS

FAN ASSEMBLY - SIFAN

Next: End

FAN RUNS DEMAND REMOVED

PCB -BOSCH HEATRONIC

Next: End

AIR PRESSURE SWITCH FAN RUNS DEMAND REMOVED

HARNESS MAIN

Next: End

DHW FAN RUNS DEMAND REMOVED

PRESSURE SWITCH - DIFFERENTIAL AIR

Next: End

HEAT EXCHANGER NOISY

PLATE HEAT EXCHANGER - INTER ALBION

Next: End

DHW PUMP RUNS

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

DHW COOL RADIATORS COOL

PLATE HEAT EXCHANGER - INTER ALBION

Next: End

DHW TOO COOL

PCB -BOSCH HEATRONIC

Next: End

DHW PUMP RUNS

PCB -BOSCH HEATRONIC

Next: End

DHW TOO COOL RADS COLD

INJECTOR - MAIN BURNER - LPG

Next: End

DHW TOO COOL RADS COLD

BURNER - LPG - AEROMATIC

Next: End

CH NOISY

PCB -BOSCH HEATRONIC

Next: End

CH NOISY

HEAT EXCHANGER - GAS TO WATER - INTER ALBION

Next: End

CH NOISY

Next: End

CH NOISY

INJECTOR - MAIN BURNER - LPG

Next: End

CH NOISY

BURNER - LPG - AEROMATIC

Next: End

FAIL POINT A

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT B

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT C

Z REDIRECT

Next: End

FAIL POINT D

Z REDIRECT

Next: End

FAIL POINT E

Z REDIRECT

Next: End

FAIL POINT E

DIVERTER VALVE SPINDLE

Next: End

FAIL POINT E

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT E

HARNESS MAIN

Next: End

FAIL POINT F

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT G

PRESSURE GAUGE

Next: End

FAIL POINT G

SYSTEM PRESSURE

Next: End

FAIL POINT G - DUNGS GV

GAS VALVE ADJUSTMENT

Next: End

FAIL POINT G

Next: End

FAIL POINT G

THERMOSTAT - OVERHEAT - ELMWOOD

Next: End

FAIL POINT G - NOT SHUTTING DOWN

PCB -BOSCH HEATRONIC

Next: End

NO FAULT FOUND

OVERHEAT

Next: End

FAIL POINT G - NOT RUNNING

PUMP C/W LEAD - CIRCULATING - GRUNDFOS

Next: End

FAIL POINT I - CH SENSOR

HARNESS MAIN

Next: End

FAIL POINT I

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT I - DHW SENSOR

HARNESS MAIN

Next: End

DHW FAN RUNS

PRESSURE SWITCH - DIFFERENTIAL AIR

Next: End

FAIL POINT K

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT G - BOSCH GV

GAS VALVE ADJUSTMENT

Next: End

CH OPERATION SHUTTING DOWN EARLY

PCB -BOSCH HEATRONIC

Next: End

BURNER DOES NOT IGNITE OR IGNITES BUT DOES NOT RAMP UP

PCB -BOSCH HEATRONIC

Next: End

FAIL POINT D - IGNORING CH DEMAND

PCB -BOSCH HEATRONIC

Next: End

PCB DHW SPARKING 1 SECOND

PCB -BOSCH HEATRONIC

Next: End

OVERHEAT DHW SPARKING 1 SECOND

HARNESS MAIN

Next: End

CH CUTS OUT ON TEMP

PCB -BOSCH HEATRONIC

Next: End

BURNER IGNITES AT HIGH FLAME

CHARACTERISTIC TEST FROM CH BURNER IGNITES

Next: p126

BURNER DOES NOT IGNITE OR IGNITES BUT DOES NOT RAMP UP

CHARACTERISTIC TEST FROM CH BURNER IGNITES

Next: p128

NO SPARKING PRESENT

CHARACTERISTIC TEST FROM DHW SPARKING

Next: p444

SPARKS FOR AROUND 1 SECOND THEN GOES TO LOCKOUT

CHARACTERISTIC TEST FROM DHW SPARKING

Next: p970

FAN DOES NOT RUN BUT RUNS FOR APPROX 15 SECONDS AFTER DEMAND REMOVED

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p495

DHW OPERATION NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p640

DHW COOL, RADIATORS WARM

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p521

DHW TOO COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p662

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p525

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p527

BOILER NOISY

CHARACTERISTIC TEST FROM CH OPERATION

Next: p696

BOILER REACHES TEMPERATURE, RADS DO NOT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p570

BURNER INJECTOR BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER AND INJECTOR

Next: !p682

BURNER BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER AND INJECTOR

Next: !p684

TEMPERATURE DIFFERENTIAL INCORRECT LOCAL NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p704

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p706

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p72

BURNER INJECTOR BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER AND INJECTOR

Next: !p716

BURNER BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION BURNER AND INJECTOR

Next: !p718

PRESSURE READS CORRECTLY BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p775

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p777

RETURNS TO OVERHEAT FAULT CODE BEFORE 82°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p797

FLOW TEMPERATURE ABOVE 82°C AND BOILER DOES NOT SHUT DOWN

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p799

BURNER IGNITES BUT THEN CUTS OUT

CHARACTERISTIC TEST FROM CH BURNER IGNITES

Next: p996

SYSTEM BEGINS TO HEAT BUT BOILER SHUTS DOWN BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM CH OPERATION

Next: p949

23/05/2019 15:29:51 1905_1_50_1 01/07/2019 10:09:21

10/06/2019 15:42:49

Next: End

RESISTANCE AIR PRESSURE SWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p1002, f1003

RESISTANCE AIR PRESSURE SWITCH AT APS

REMOVE GREEN WIRES FROM AIR PRESSURE SWITCH

Next: !p1004, f1005

AIR PRESSURE SWITCH TUBES (NA)

Next: p1006, !f1007

VOLTAGE FAN AT PCB

USE INSULATION MAT AS NECESSARY

Next: !p1012, !f1013

PRESSURE APS SWITCHING

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: !p1016, !f1017

OBSERVATION COLD MAINS FLOW RATE

Next: p1027, !f1028

INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p1044, !f1045

ADJUSTMENT PRESSURE MAX AND MIN (BOSCH)

ATTACH U-GAUGE TO GA

Next: !p1048, !f1049

ADJUSTMENT PRESSURE MAX AND MIN (BOSCH)

ATTACH U-GAUGE TO GA

Next: !p1055, !f1056

FUSE FURTHER INVESTIGATION

Next: !p1062, !f1063

RESISTANCE GAS VALVE SOLENOIDS AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p1112, f386

FUSE F1 (2 AMP)

REMOVE FUSE F1 FROM PCB

Next: p1076, f1077

FUSE FURTHER INVESTIGATION

Next: !p1078, !f1079

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p1082, f1083

FUSE FURTHER INVESTIGATION

Next: !p1084, !f1085

RESISTANCE PUMP AND HARNESS (FUSE INVESTIGATION)

DISCONNECT PLUG ST15 FROM THE PCB

Next: p1093, !f1094

RESISTANCE FAN (FUSE INVESTIGATION)

DISCONNECT LEADS FROM THE FAN

Next: !p1097, !f1098

MAIN GAS VALVE VOLTAGE

REMOVE CONNECTORS (O

Next: !p178, !f196

RESISTANCE HARNESS GAS VALVE MAIN (FUSE INVESTIGATION)

DISCONNECT MAIN SOLE

Next: !p1101, !f1102

RESISTANCE HARNESS GAS VALVE MODUREG (FUSE INVESTIGATION)

DISCONNECT MODULATING SOLENOID WIRES (BLUE CONNECTOR) FROM THE GAS VALVE

Next: !p1105, !f1106

RESISTANCE OVERHEAT THERMOSTAT AT THERMOSTAT

DISCONNECT ORANGE WIRES FROM OVERHEAT THERMOSTAT

Next: !p1158, !f1159

PRIMARY SENSOR (AUTO FROST)

DISCONNECT RED LEADS FROM SENSOR

Next: !p142, !f141

DHW SENSOR MODULATION RESISTANCE

Next: !p164, !f163

PRIMARY SENSOR (CH MODULATION)

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p175, !f174

INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p410, !f395

INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p228, !f229

RESISTANCE DIVERTER VALVE MICROSWITCH AT MICROSWITCH

DISCONNECT DIVERTER MICROSWITCH AND DISCONNECT LEADS

Next: !p236, !f237

RESISTANCE AIR PRESSURE SWITCH AT APS

REMOVE GREEN WIRES FROM AIR PRESSURE SWITCH

Next: !p253, f80

DIVERTER VALVE DIAPHRAGM

DRAIN AND DISCHARGE BOILER

Next: !p33, !f32

RESISTANCE HARNESS GAS VALVE SOLENOIDS

DISCONNECT MAIN SOLE

Next: !p408, !f409

RESISTANCE HARNESS GAS VALVE MODULATING SOLENOID

DISCONNECT MODULATING SOLENOID WIRES (BLUE CONNECTOR)
FROM THE GAS VALVE

Next: !p433, !f421

RESISTANCE DIVERTER VALVE MICROSWITCH AT MICROSWITCH (OPEN CIRCUIT)

DISCONNECT DIVERTER MICROSWITCH AND DISCONNECT LEADS

Next: !p440, !f441

PRESSURE APS SWITCHING

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: !p447, !f448

ON/OFF SWITCH VOLTAGE (OUTPUT)

GAIN ACCESS TO PCB CONNECTIONS

Next: p52, f1075

SPARK ELECTRODES

Next: p451, !f452

FUSE F2 (1.25 AMP)

REMOVE FUSE F2 FROM PCB

Next: p62, f1061

VOLTAGE FAN AT PCB

USE INSULATION MAT AS NECESSARY

Next: p616, !f617

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p620, !f621

RESISTANCE DHW SENSOR AT SENSOR

Next: !p624, !f625

RESISTANCE DIVERTER VALVE MICROSWITCH AT MICROSWITCH

DISCONNECT DIVERTER MICROSWITCH AND DISCONNECT LEADS

Next: !p628, !f629

RESISTANCE AIR PRESSURE SWITCH AT APS

REMOVE GREEN WIRES FROM AIR PRESSURE SWITCH

Next: !p634, f635

AIR PRESSURE SWITCH TUBES (NA)

Next: p636, !f637

RESISTANCE DIVERTER VALVE MICROSWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p68, f235

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: !p669, !f670

FUSE F1 (2 AMP) (FAULT CODE)

REMOVE FUSE F1 FROM PCB

Next: p725, !f726

FUSE F2 (1.25 AMP) (FAULT CODE)

REMOVE FUSE F2 FROM PCB

Next: p731, !f960

INFORMATION FAIL POINT C

Next: !p737, !f738

OBSERVATION DOES BOILER RESPOND TO CH DEMAND

BOILER ON/OFF SWITCH ON

Next: p741, f964

OBSERVATION DOES BOILER RESPOND TO DHW DEMAND

BOILER ON/OFF SWITCH ON

Next: p753, f756

DHW DEMAND

REMOVE PLASTIC COVER FROM DIVERTER VALVE MICROSWITCH

Next: p760, f757

DIVERTER VALVE DIAPHRAGM

DRAIN AND DISCHARGE BOILER

Next: !p758, !f759

RESISTANCE DIVERTER VALVE MICROSWITCH AT MICROSWITCH

DISCONNECT DIVERTER MICROSWITCH AND DISCONNECT LEADS

Next: !p763, !f764

TEMPERATURE AMBIENT

Next: p767, !f768

INSPECTION PRESSURE SYSTEM

Next: p1121, ?774, ?776

INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p930, !f783

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: !p788, !f789

AIR PRESSURE SWITCH TUBES (NA)

Next: p83, !f82

PUMP VOLTAGE

Next: !p834, !f835

RESISTANCE PRIMARY SENSOR AT PCB (FAULT CODE)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p843, f844

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p845, !f846

RESISTANCE DHW SENSOR AT SENSOR

Next: !p849, !f850

INFORMATION FAIL POINT K

FAULT CODES NOT

Next: !p928, !f929

ADJUSTMENT PRESSURE MAX AND MIN (BOSCH)

ATTACH U-GAUGE TO GA

Next: !p935, !f936

ROOM THERMOSTAT/EXTERNAL CONTROLS RESISTANCE

ROOM THERMOSTAT (IF FITTED) CALLING

Next: !p965, !f966

RESISTANCE OVERHEAT THERMOSTAT AT THERMOSTAT

DISCONNECT ORANGE WIRES FROM OVERHEAT THERMOSTAT

Next: !p975, !f976

OBSERVATION DOES FAN RUN BEFORE LOCKOUT

BOILER ON/OFF SWITCH ON

Next: p1000, f1001

PRESSURE APS SWITCHING AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p1014, f1015

VOLTAGE FAN AT FAN

BOILER ON/OFF SWITCH ON

Next: !p1010, f1011

FLUE VENTURI

Next: !p1008, !f1009

OBSERVATION SPARKING APS PROVED

CONNECT THE AIR PRES

Next: p1018, !f1019

AIR PRESSURE SWITCH TUBES

Next: p1020, !f1021

FLUE VENTURI (AIR DETECT)

Next: p1107, !f1023

FLUE

Next: !p1024, !f1025

DHW FLOW RATE ADJUSTER

Next: p1029, !f1030

DHW INLET FILTER

BOILER DRAINED AND DISCHARGED
DHW ISOLATED AND DRAINED

Next: p1031, !f1032

FLOW RESTRICTOR

BOILER DRAINED AND DISCHARGED

Next: !p1033, !f1034

SPARK ELECTRODES

Next: !p1059, !f1060

RESISTANCE FLAME SENSE ELECTRODE

{ISOLATEMAINSPOWER}
DISCONNECT FLAME SENSE ELECTRODE LEAD
ASSEMBLY FROM CONNECTOR

Next: p1039, !f1040

RESISTANCE FLAME SENSE LEAD

{ISOLATEMAINSPOWER}<

Next: !p1041, !f1042

OBSERVATION GAS VALVE TYPE

THE GAS VALVE WILL N

Next: p1046, f1047

ADJUSTMENT PRESSURE MAX AND MIN (DUNGS)

ATTACH U-GAUGE TO GA

Next: !p1050, !f1051

OBSERVATION GAS VALVE TYPE

THE GAS VALVE WILL N

Next: p1053, f1054

ADJUSTMENT PRESSURE MAX AND MIN (DUNGS)

ATTACH U-GAUGE TO GA

Next: !p1057, !f1058

MAINS POWER

Next: !p1080, f1081

INSPECTION FLUE RESTRICTOR

Next: p457, !f1090

BURNER PRESSURE (GAS PRESENT)

ATTACH U-GAUGE TO GAS VALVE OUTLET PRESSURE TEST POINT

Next: p1035, f110

RESISTANCE FAN AND HARNESS (FUSE INVESTIGATION)

DISCONNECT PLUG ST1 FROM THE PCB

Next: p1095, f1096

RESISTANCE GAS VALVE MAIN AND HARNESS (FUSE INVESTIGATION)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p1099, f1100

RESISTANCE GAS VALVE MODUREG AND HARNESS (FUSE INVESTIGATION)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p1103, f1104

INSPECTION FLUE RESTRICTOR

Next: p1022, !f1111

INLET PRESSURE

ATTACH PRESSURE GAUG

Next: p109, !f1120

RESISTANCE OVERHEAT THERMOSTAT AT PCB (FAULT CODE)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB
ENSURE BOILER IS COOL

Next: p804, f1157

RESISTANCE DIVERTER VALVE MICROSWITCH AT PCB (OPEN CIRCUIT)

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p130, f439

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FROM CH SENSOR

Next: p961, !f131

GAS IGNITION PRESSURE

ATTACH PRESSURE GAUG

Next: p1038, !f231

RESISTANCE GAS VALVE MODULATING SOLENOID AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p411, f419

FULL VOLTAGE MODULATING SOLENOID

REMOVE CONNECTOR (BL

Next: p1052, !f429

PRESSURE APS SWITCHING AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p445, f446

OBSERVATION SPARKING APS PROVED

CONNECT THE AIR PRES

Next: p449, f450

AIR PRESSURE SWITCH TUBES

Next: p455, !f456

SPARK ELECTRODE LEAD CONDITION AND CONTINUITY

REMOVE THE IGNITION LEADS FROM THE ELECTRODES AND PCB

Next: !p453, !f454

FLUE VENTURI (AIR DETECT)

Next: p1086, !f458

FLUE

Next: !p459, !f460

RESISTANCE AIR PRESSURE SWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p632, f633

TRANSFORMER VOLTAGE (OUTPUT)

BOILER ON/OFF SWITCH ON

Next: p60, f59

RESISTANCE DHW SENSOR AT SENSOR

Next: !p536, !f562

PUMP LIMPET TEST

Next: p528, !f529

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p530, !f531

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p532, !f563

RESISTANCE DHW SENSOR AT SENSOR

Next: !p534, !f564

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p571, !f572

PUMP LIMPET TEST

Next: p573, !f574

CH DIVERTER CHECK

ENSURE SECONDARY HEA

Next: !p575, !f596

PUMP VOLTAGE

Next: !p66, f65

RESISTANCE PRIMARY SENSOR AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p618, f619

RESISTANCE DHW SENSOR AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p622, f623

TRANSFORMER RESISTANCE

REMOVE TRANSFORMER FROM PCB
(THIS WILL REQUIRE THE REMOVAL OF THE METAL BACK OF THE CONTROL BOX)

Next: !p138, !f63

RESISTANCE DIVERTER VALVE MICROSWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p626, f627

FLUE VENTURI

Next: !p638, !f639

PUMP LIMPET TEST

Next: p641, !f642

CENTRAL HEATING OPERATION

ROOM THERMOSTAT (IF FITTED) CALLING

Next: !p643, !f644

PUMP LIMPET TEST

Next: p666, !f664

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p667, f668

RESISTANCE DHW SENSOR AT SENSOR

Next: p671, !f672

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p673, !f674

INSPECTION BURNER AND INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: !p678, ?681, ?683

PUMP LIMPET TEST

Next: p697, !f698

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: p707, !f700

DIFFERENTIAL FLOW RETURN

CH POTENTIOMETER SET TO MAX
ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES

Next: !p701, ?703, ?705

INSPECTION BURNER AND INJECTOR

{ISOLATEMAINSPOWER}
REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p699, ?715, ?717

RESISTANCE AIR PRESSURE SWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: p81, f247

MAINS POWER

Next: !p727, !f728

TRANSFORMER RESISTANCE

REMOVE TRANSFORMER FROM PCB
(THIS WILL REQUIRE THE REMOVAL OF THE METAL BACK OF THE CONTROL BOX)

Next: !p733, !f734

INFORMATION FAIL POINT D

Next: !p743, !f744

INFORMATION FAIL POINT E

Next: !p754, !f755

RESISTANCE DIVERTER VALVE MICROSWITCH AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p761, f762

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p769, !f770

PUMP LIMPET TEST

Next: p778, !f779

PRESSURE BURNER MAX AND MIN

ATTACH U-GAUGE TO GA

Next: p977, f781

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p786, f787

ADJUSTMENT PRESSURE MAX AND MIN (DUNGS)

ATTACH U-GAUGE TO GA

Next: !p784, !f785

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS INDICATED

Next: p792, !f793

OBSERVATION RUN BOILER UP TO TEMPERATURE

CH TEMPERATURE SELECTOR TO MAX
ATTACH TEMPERATURE CLAMP TO THE FLOW PIPE BENEATH THE PUMP

Next: p794, ?796, ?798

OVERRUN OPERATION

Next: !p802, !f803

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p800, !f801

DHW PUMP RUNS

Next: p773, f833

VOLTAGE FAN AT FAN

BOILER ON/OFF SWITCH ON

Next: !p630, f615

FLUE VENTURI

Next: !p85, !f84

RESISTANCE DHW SENSOR AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p847, f848

OBSERVATION GAS VALVE TYPE

THE GAS VALVE WILL N

Next: p782, f934

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p950, !f951

ROOM THERMOSTAT/EXTERNAL CONTROLS RESISTANCE

ROOM THERMOSTAT (IF FITTED) CALLING

Next: !p962, !f963

RESISTANCE OVERHEAT THERMOSTAT AT PCB

DISCONNECT PLUG CONNECTOR (MARKED ST16) FROM PCB

Next: !p973, f974

PRESSURE BURNER CH MODE

CH TEMPERATURE SELEC

Next: p780, !f995

RESISTANCE PRIMARY SENSOR AT SENSOR

REMOVE RED WIRES FROM CH TEMPERATURE SENSOR
ENSURE BOILER IS COOL

Next: !p997, !f998

Welcome to the XSol Diagnostic System