XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

BAXI ECOBLUE COMBI & ECOBLUE PLUS COMBI

GLOBALLY REPLACED

Next: &3, *

NO FAULT FOUND

Next: nff

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f2

CASE OFF

Next: &2521, !f150

FAULT CODES

Next: &2833, !f7

OBSERVATION PUMP RUNS DHW DEMAND

ENSURE APPLIANCE IS COOL
SET FLOW RATE TO APPROX. 3 LITRES A MINUTE

Next: &172, f951

OBSERVATION FAN RUNS

Next: &312, f856

OBSERVATION SPARKING OCCURS

Next: &413, f1683

OBSERVATION BURNER LIGHTS AND ESTABLISHES

Next: &538, ?415, ?417, ?419

OPERATION HOT WATER

Next: &645, ?539, ?541, ?543, ?545

ALTERNATIVE DIFFERENTIAL TEST - USING INFO DISPLAY

Next: &nff, f558

OBSERVATION DOES BOILER RESPOND TO HEATING DEMAND

Next: &2109, f2207

E20 - FLOW SENSOR SHORT OR OPEN

Next: &nff, f1204

E28 - FLUE SENSOR SHORT OR OPEN

Next: &nff, f2041

E40 - RETURN SENSOR SHORT OR OPEN

Next: &nff, f1194

E109 E125 - CIRCULATION FAULT

Next: &nff, f1250

E110 E111 - OVER HEAT STAT 110 PRISENSOR 111

Next: &nff, f1228

E117 E118 - 117 SYSPRES HI 118 SYSPRESS LO

Next: &nff, f2068

E130 - FLUE TOO HOT

Next: &nff, f1342

E321 - HOT WATER SENSOR SHORT OR OPEN

Next: &nff, f1355

E384 - FALSE FLAME

Next: &nff, f2078

FUSE FURTHER INVESTIGATION

Next: &nff, f1631

E160 - FAN FAULT

Next: &nff, f2265

OPERATION CENTRAL HEATING

Next: &2256, ?2110, ?2142, ?2170, ?2174

OBSERVATION PUMP OVERRUN

Next: &nff, !f2259

E83 - FLOW SWITCH SHORT

Next: &nff, f2876

E386 - FAN SHORT

Next: &nff, f2396

E151

Next: &nff, f2402

OBSERVATION BOILER ENTERS STANDBY MODE

Next: &1, ?2522, ?2524, ?2526, ?2528

INFORMATION RESETTING APPLIANCE

THIS APPLIANCE HAS F

Next: &nff, !f2737

OBSERVATION DHW MIN FLOW RATE

Next: &42, f2834

E85 EXTERNAL CONTROLS

NOT USED HEADER FOR FAULT CODE

Next: &nff, f2895

FAN NOT RUNNING

THERMOSTAT 105 DEG C - LIMIT

Next: End

E40

HARNESS - LOW VOLTAGE

Next: End

E20

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

FAULT E110 E111 - OPEN CIRCUIT

THERMOSTAT 105 DEG C - LIMIT

Next: End

E130

HEAT EXCHANGER ASSEMBLY

Next: End

E130

HARNESS - WIRING - NTC

Next: End

FAN NOT RUNNING - FLUE STAT

HARNESS - WIRING - NTC

Next: End

FLUE SENSOR TRIGGER

FLUE

Next: End

E321

HARNESS - LOW VOLTAGE

Next: End

NOT STOP SPARKING

CONDENSATE TRAP ASSEMBLY

Next: End

CASE REMOVAL

Z REDIRECT

Next: End

E109 E125 DIVERTER VOLT

PCB

Next: End

E109 E125

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E109 E125 DIVERTER VOLTS HEATING

PCB

Next: End

E109 E125 HEATING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E109 E125 HEATING CAL

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

E109 E125 BOTH DEMANDS DIVERTER VOLT

PCB

Next: End

E109 E125 BOTH DEMANDS

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E109 E125 BOTH DEMANDS PUMP VOLTS

PCB

Next: End

DHW TOO HOT

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

DHW TOO HOT

SENSOR - NTC - DHW

Next: End

E109 E125 BOTH DEMANDS

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

E109 E125

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

E110 E111

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

E110 E111

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

FUSE INVESTIGATION

HEAD - MOTOR - 3 WAY VALVE

Next: End

FUSE INVESTIGATION - NO CLOCK

HARNESS - POWER SUPPLY

Next: End

FUSE INVESTIGATION

FAN

Next: End

FUSE INVESTIGATION

PUMP

Next: End

FUSE INVESTIGATION

IGNITER ASSEMBLY

Next: End

FUSE INVESTIGATION

GAS VALVE

Next: End

FUSE INVESTIGATION

INTERNAL TIMER

Next: End

OBSERVATION SPARKING OCCURS

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

OBSERVATION SPARKING OCCURS

SENSOR - NTC - DHW

Next: End

NO SPARK SEEN

HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO SPARK SEEN

CABLE - IGNITION ELECTRODE

Next: End

NO SPARK SEEN

LEAD - EARTH - IGNITOR

Next: End

NO SPARK SEEN

ELECTRODE - SPARK

Next: End

NO HOT WATER - GAS VALVE SHORT

PCB MAIN AND GAS VALVE

Next: End

DOES NOT LIGHT - SOLENOID DAMAGED

GAS VALVE

Next: End

DOES NOT LIGHT

AIRBOX

Next: End

NO IGNITION RESTRICTED

INJECTOR

Next: End

NOT LIGHTING

ELECTRODE - SPARK

Next: End

BAFFLES OUT

CONDENSATE TRAP ASSEMBLY

Next: End

BAFFLES OUT

GAS SUPPLY

Next: End

BAFFLES OUT - AIR IN

FLUE

Next: End

BAFFLES OUT

AIRBOX

Next: End

NO IGNITION

CONDENSATE TRAP ASSEMBLY

Next: End

SPARKING DOES NOT STOP

GAS SUPPLY

Next: End

BAFFLES OUT

HEAT EXCHANGER ASSEMBLY

Next: End

BAFFLES OUT

BURNER

Next: End

BAFFLES OUT

FLUE

Next: End

BAFFLES OUT PRESSURE OK

BURNER

Next: End

FOR TYPE DIAG PROCEDURE

Z REDIRECT

Next: End

FAULT E28

HARNESS - WIRING - NTC

Next: End

FAULT E28

THERMOSTAT 105 DEG C - LIMIT

Next: End

FAULT E109 E125 CH FAULT

Next: End

E117 E118

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 384

FLUE

Next: End

FAULT E384

CONDENSATE TRAP ASSEMBLY

Next: End

FAULT CODE 384 PASSING

GAS VALVE

Next: End

FAULT E160FAN NOT RUNNING

HARNESS - LOW VOLTAGE

Next: End

FAULT E160FAN NO RUNNING - NO MAINS

PCB

Next: End

FAULT E160FAN NOT RUNNING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAULT E160FAN NOT RUNNING - NO PWM

PCB

Next: End

CH NOISY

AIRBOX

Next: End

CH NOISY

CONDENSATE TRAP ASSEMBLY

Next: End

CH NOISY

BURNER

Next: End

CH NOISY - GAS RATE

HEAT EXCHANGER ASSEMBLY

Next: End

CH NOISY

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

CH NOISY

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

RAD COOL BOILER TO TEMP - DIVERTER VOLTAGE

PCB

Next: End

DIVERTER VALVE RADS COOL BOILER WARM

HARNESS - WIRING - HIGH VOLTAGE

Next: End

CH RADS COOL BOILER AT TEMP

CARTRIDGE - 3 WAY VALVE

Next: End

CH RADS COOL BOILER AT TEMP

VALVE - RETURN / VALVE - CENTRAL HEATING

Next: End

CH RADS COOL BOILER AT TEMP

CARTRIDGE - BYPASS

Next: End

CH RADS COOL BOILER AT TEMP

FILTER - CH

Next: End

PRESSURE RISE ON HEATING

EXPANSION VESSEL

Next: End

CH SHUTS DOWN EARLY

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

CH SHUTS DOWN EARLY

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

PUMP OVERRUN

PCB

Next: End

NO SPARKING

HARNESS - LOW VOLTAGE

Next: End

FAULT E160 FAN RUNNING

HARNESS - LOW VOLTAGE

Next: End

NOT STOP SPARKING - FLAME SENSE LEAD SHORTING

HARNESS - LOW VOLTAGE

Next: End

REVERSE POLARITY

Next: End

FAULT 151

PCB WATER INGRESS

Next: End

FAULT E151

PCB

Next: End

FAULT E386

HARNESS - LOW VOLTAGE

Next: End

E110 E111 PUMP VOLTS

PCB

Next: End

FAULT E110 E111

HEAT EXCHANGER ASSEMBLY

Next: End

FAULT E321

PCB

Next: End

FAULT E386

PCB

Next: End

FAULT E40

PCB

Next: End

FAULT E28

PCB

Next: End

FAULT E20

PCB

Next: End

NO HEATING - CLOCK - NO POWER TO EXT

PCB

Next: End

NO HEATING - NO CLOCK

CONNECTOR - TIMER BRIDGE

Next: End

NO HEATING - NO CLOCK - NO POWER TO EXT

PCB

Next: End

PUMP RUNS CONTINUOUSLY

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

NO DISPLAY

MAINS FUSE

Next: End

BLANK DISPLAY

FUSE 2A 250V WITH HOLDER

Next: End

BLANK DISPLAY

HARNESS - POWER SUPPLY

Next: End

NO DISPLAY

PCB

Next: End

NO DISPLAY

HARNESS - WIRING - BOILER CONTROL

Next: End

FIRING WITH NO DEMAND

AMBIENT TEMP

Next: End

FIRING WITH NO DEMAND EXT FROST

Next: End

FIRES WITH NO DEMAND

WATER LEAK OR OPEN TAP

Next: End

FIRING WITH NO DEMAND

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

FAN RUNS CONT AT POWER UP

HARNESS - LOW VOLTAGE

Next: End

FAN RUNS CONT

PCB

Next: End

WATER COOL READS COOL

CONDENSATE TRAP ASSEMBLY

Next: End

WATER COOL RADS COOL

EXTERNAL MIXING

Next: End

DHW COOL RADS COOL

PUMP

Next: End

WATER COOL RADS COOL

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

WATER COOL RADS COOL

SENSOR - NTC - DHW

Next: End

DHW COOL RADS COOL

SENSOR - NTC - HEAT EXCHANGER

Next: End

DHW COOL RADS COOL LOW PRESSURE

BURNER

Next: End

DHW COOL RADS COOL LOW PRESSURE

HEAT EXCHANGER ASSEMBLY

Next: End

DHW COOL RADS COOL LOW PRESSURE

FLUE

Next: End

DHW COOL RADS COOL

GAS SUPPLY

Next: End

DHW NOISY

CONDENSATE TRAP ASSEMBLY

Next: End

DHW NOISY

AIRBOX

Next: End

DHW NOISY

BURNER

Next: End

DHW NOISY - GAS RATE

HEAT EXCHANGER ASSEMBLY

Next: End

NOISY OPERATION DHW

PUMP

Next: End

DHW RUNS HOT COLD

HEAT EXCHANGER ASSEMBLY

Next: End

FUSE INVESTIGATIONRESISTANCE OK

HEAD - MOTOR - 3 WAY VALVE

Next: End

FAN RUNS CONTINUALLY

HARNESS - LOW VOLTAGE

Next: End

E109 E125 OCCURS ON HOT WATER NO POWER TO PUMP

PCB

Next: End

E109 E125 PUMP

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E109 E125 OCCURS ON HOT WATER RUNNING SLOW

PUMP

Next: End

E109 E125

HEAT EXCHANGER - PLATE TO PLATE

Next: End

E109 E125 BOTH DEMANDS PUMP

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E109 E125 BOTH DEMANDS RUNNING SLOW

PUMP

Next: End

E109 E125 BOTH DEMANDS

HEAT EXCHANGER ASSEMBLY

Next: End

E109 E125 BOTH DEMAND

Next: End

E110 E111

HARNESS - LOW VOLTAGE

Next: End

INFO BOILER RESET

Z REDIRECT

Next: End

E110 E111

FILTER - CH

Next: End

FAULT E110 E111

PUMP

Next: End

CH NOISY

PUMP

Next: End

CH NOISY

FILTER - CH

Next: End

E110 E110 STUCK IN FAULT

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

E110 E111 STUCK IN FAULT

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER ASSEMBLY

Next: End

NO IGNITION BLOCKED

INJECTOR

Next: End

DOES NOT LIGHT

BURNER

Next: End

DOES NOT LIGHT

HEAT EXCHANGER ASSEMBLY

Next: End

DOES NOT LIGHT - AIR IN

FLUE

Next: End

DOES NOT LIGHT LOW PRESSURE

AIRBOX

Next: End

NO HOT WATER

MAINS WATER SUPPLY

Next: End

POOR FLOW RATE

VALVE - COMPACT - RETURN - DHW

Next: End

POOR FLOW RATE

CARTRIDGE - 12L FLOW RATE - DHW

Next: End

NO HOT WATER

CARTRIDGE - 12L FLOW RATE - DHW

Next: End

DHW HALL SENSOR

HARNESS - LOW VOLTAGE

Next: End

NO HOT WATER

SENSOR - NTC - DHW

Next: End

RETURN - NO HOT WATER

HARNESS - LOW VOLTAGE

Next: End

PUMP NOT RUNNING HW

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E160 FAN RUNS HALL SENSOR VOLTAGE PRESENT

HARNESS - LOW VOLTAGE

Next: End

OBSERVATION PUMP RUNS

EXTERNAL MIXING

Next: End

FIRING WITHOUT DEMAND

SENSOR - NTC - DHW

Next: End

FAULT E83

HARNESS - LOW VOLTAGE

Next: End

FAULT E83

PCB

Next: End

FAULT E83 EBUS / LOW VOLTAGE FITTED

HARNESS - LOW VOLTAGE

Next: End

FAULT E83 EBUS / LOW VOLTAGE FITTED

PCB

Next: End

E85

PCB

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRES WITH NO DEMAND

WATER LEAK OR OPEN TAP

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRING WITH NO DEMAND

SENSOR - THERMODISC - MINIFIT (FLOW)

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRING WITHOUT DEMAND

SENSOR - NTC - DHW

Next: End

FIRING WITH NO DEMAND

LOW VOLTAGE / EBUS CONTROLS

Next: End

E83 FAULT CODE

LOW VOLTAGE / EBUS CONTROLS

Next: End

E85 FAULT CODE

LOW VOLTAGE / EBUS CONTROLS

Next: End

NOT RESPONDING TO CH

LOW VOLTAGE / EBUS CONTROLS

Next: End

NOT STOP SPARKING

ELECTRODE - FLAME SENSING

Next: End

NOT STOP SPARKING

HARNESS - LOW VOLTAGE

Next: End

ALT DIFFERENTIAL TEST 2

Z REDIRECT

Next: End

WATER COOL RADS COOL DIVERTER VOLTAGE

PCB

Next: End

DIVERTER VALVE WATER COOL RADS COOL

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAULT CODES

Z REDIRECT

Next: End

FAN NO RUNNING - NO MAINS

PCB

Next: End

FAN NOT RUNNING

HARNESS - LOW VOLTAGE

Next: End

FAN NOT RUNNING

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAN NOT RUNNING - FLUE SENSOR

HARNESS - LOW VOLTAGE

Next: End

FAN NOT RUNNING - NO PWM

PCB

Next: End

TO OVERHEAT

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E40

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

E20

HARNESS - LOW VOLTAGE

Next: End

E110 E111

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E130

PCB

Next: End

E130

HARNESS - LOW VOLTAGE

Next: End

E130

SENSOR - NTC - HEAT EXCHANGER

Next: End

FAN NOT RUNNING

SENSOR - NTC - HEAT EXCHANGER

Next: End

E321

SENSOR - NTC - DHW

Next: End

DHW TEMPERATURE SETTING

CUSTOMER ACTION

Next: End

OBSERVATION PUMP RUNS DHW DEMAND

PCB HMI - BOILER CONTROL

Next: End

E109 E125

HEAD - MOTOR - 3 WAY VALVE

Next: End

E109 E125 HEATING

HEAD - MOTOR - 3 WAY VALVE

Next: End

E109 E125 HEATING SENSOR CAL

PCB

Next: End

E109 E125 BOTH DEMANDS

HEAD - MOTOR - 3 WAY VALVE

Next: End

FUSE INVESTIGATION - DIVERTER

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FUSE FURTHER INVESTIGATION SHORT

Next: End

FUSE INVESTIGATION - NO CLOCK

PCB

Next: End

FUSE INVESTIGATION - CLOCK

PCB

Next: End

FUSE INVESTIGATION - PUMP

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FUSE INVESTIGATION - NO FAULT FOUND

NO FAULT - FUSE INVESTIGATION

Next: End

FUSE INVESTIGATION - SPARK GENERATOR

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FUSE INVESTIGATION - GAS VALVE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FUSE INVESTIGATION - FAN

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FUSE INVESTIGATION - CLOCK

HARNESS - POWER SUPPLY

Next: End

OBSERVATION SPARKING OCCURS - NO SPARK WITHOUT LEADS

IGNITER ASSEMBLY

Next: End

NO SPARK SEEN

IGNITER ASSEMBLY

Next: End

DOES NOT LIGHT

GAS SUPPLY

Next: End

NOT LIGHTING - NO SUPPLY TO GAS VALVE

PCB

Next: End

BOILER DOES NOT LIGHT

PCB AND HARNESS - WIRING - HIGH VOLTAGE

Next: End

NO IGNITION NOT OPENING

GAS VALVE

Next: End

NOT LIGHTING - GAS VALVE

HARNESS - WIRING - HIGH VOLTAGE

Next: End

DOES NOT LIGHT

FAN

Next: End

DOES NOT LIGHT

VENTURI

Next: End

NO IGNITION NOT OPENING FULLY

GAS VALVE

Next: End

BAFFLES OUT

FAN

Next: End

BAFFLES OUT

VENTURI

Next: End

BAFFLES OUT LOW PRESSURE

FAN

Next: End

BAFFLES OUT

GAS VALVE

Next: End

FAULT E28

HARNESS - LOW VOLTAGE

Next: End

FAULT E28

SENSOR - NTC - HEAT EXCHANGER

Next: End

FAULT E28

HARNESS - WIRING - HIGH VOLTAGE

Next: End

E117 E118

PCB

Next: End

FAULT E384

PCB

Next: End

FAULT E160FAN NOT RUNNING

FAN

Next: End

CH NOISY

GAS VALVE

Next: End

CH NOISY

FAN

Next: End

CH NOISY

VENTURI

Next: End

CH NOISY

FLUE

Next: End

CH NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

CH NOISY

Next: End

RADS COOL BOILER WARM

HEAD - MOTOR - 3 WAY VALVE

Next: End

BOILER GETS HOT BUT RADS DO NOT

Next: End

PRESSURE RISE ON HEATING

HOSE - EXPANSION VESSEL

Next: End

CH TEMPERATURE SETTING

CUSTOMER ACTION

Next: End

OPERATION CH - CH SET TOO LOW

PCB HMI - BOILER CONTROL

Next: End

CH SHUTS DOWN EARLY RETURN

PCB

Next: End

CH TURNED OFF

CUSTOMER ACTION

Next: End

BOILER RESPONDS TO CH - TURNED OFF

PCB HMI - BOILER CONTROL

Next: End

NO SUPPLY TO SPARK GEN

PCB

Next: End

NO SPARKING

FAN

Next: End

FAULT E160 FAN RUNNING

FAN

Next: End

NOT STOP SPARKING - SHORTING TO EARTH

ELECTRODE - FLAME SENSING

Next: End

FAULT CODE E117 E118

HYDRAULIC GROUP ASSEMBLY

Next: End

FAULT CODE E117 E118 - NOT BLOCKED

SENSOR - PRESSURE

Next: End

NOT STOP SPARKING - SUPPLY TO RECT

PCB

Next: End

FAULT E386

FAN

Next: End

FAULT E151

Z REDIRECT

Next: End

FAULT E110 E111

HEAT EXCHANGER - PLATE TO PLATE

Next: End

NO FAULT OVERHEAT

OVERHEAT

Next: End

FAULT E110 E111 KEEPS FIRING

PCB

Next: End

FAULT E110 E111 - TRIPPING EARLY

THERMOSTAT 105 DEG C - LIMIT

Next: End

FAULT E321

Z REDIRECT

Next: End

FAULT E386

Z REDIRECT

Next: End

FAULT E40

Z REDIRECT

Next: End

FAULT E28

Z REDIRECT

Next: End

FAULT E20

Z REDIRECT

Next: End

NO HEATING - NOT RESPONDING TO EXT CONTROLS

PCB

Next: End

NO HEATING - NO SWITCH LIVE EXT ONLY

Next: End

NO HEATING - NO COMMON AT TERMINAL STRIP

HARNESS - POWER SUPPLY

Next: End

NO HEATING NOT RESPONDING TO INTERNAL CONTROLS

PCB

Next: End

NO HEATING - INTERNAL TIMER AND ROOM STAT

Next: End

NO HEATING - CLOCK - EXT TO PCB

HARNESS - POWER SUPPLY

Next: End

NO HEATING - CLOCK - CLOCK TO EXT

HARNESS - POWER SUPPLY

Next: End

NO HEATING - CLOCK - PCB TO CLOCK

HARNESS - POWER SUPPLY

Next: End

NO HEATING

INTERNAL TIMER

Next: End

PUMP RUNS CONTINUOUSLY

PCB

Next: End

FLOW - PUMP RUNS CONTINOUSLY

HARNESS - LOW VOLTAGE

Next: End

BLANK DISPLAY

Next: End

FUSE INVESTIGATION MAINS

Z REDIRECT

Next: End

FUSE INVESTIGATION INTERNAL

Z REDIRECT

Next: End

NO DISPLAY

PCB HMI - BOILER CONTROL

Next: End

FIRING WITHOUT DEMAND FLOW

HARNESS - LOW VOLTAGE

Next: End

FAN RUNS CONT

FAN

Next: End

FIRE WITH NO DEMAND

PCB

Next: End

DHW TOO HOT

PCB

Next: End

DHW COOL RADS COOL DHW TEMPERATURE SETTING

CUSTOMER ACTION

Next: End

DHW COOL RADS COOL

PCB HMI - BOILER CONTROL

Next: End

DHW COOL RADS COOL LOW PRESSURE

FAN

Next: End

DHW NOISY

FAN

Next: End

DHW NOISY

VENTURI

Next: End

DHW NOISY

FLUE

Next: End

DHW NOISY

PRESSURE GAUGE

Next: End

DHW RUNS HOT COLD

SYSTEM PRESSURE

Next: End

DHW RUNS HOT COLD

PCB

Next: End

NOISY OPERATION DHW

HEAT EXCHANGER - PLATE TO PLATE

Next: End

FUSE INVESTIGATION - DIVERTERRESISTANCE OK

HARNESS - WIRING - HIGH VOLTAGE

Next: End

FAN RUNS CONTINUALLY

SENSOR - PRESSURE

Next: End

E109 E125 OCCURS ON HOT WATER NOT RUNNING

PUMP

Next: End

E109 E125 OCCURS ON HOT WATER

PCB

Next: End

E109 E125 BOTH DEMANDS STUCK

PUMP

Next: End

E109 E125 BOTH DEMANDS

HEAT EXCHANGER - PLATE TO PLATE

Next: End

E019 E125 NO FAULT FOUND

E109 E125 NO FAULT FOUND

Next: End

E110 E111 NOT RUNNING

PUMP

Next: End

FAULT E110 E111

Next: End

FAULT E110 E111 STUCK IN FAULT

PCB

Next: End

E117 E118

PRESSURE GAUGE

Next: End

FAULT E117 E118

SYSTEM PRESSURE

Next: End

E110 E111

PRESSURE GAUGE

Next: End

FAULT E110 E111

SYSTEM PRESSURE

Next: End

E117 E118

SENSOR - PRESSURE (BLOCKAGE)

Next: End

WATER COOL READS COOL

PCB

Next: End

WATER COOL RADS COOL

HEAT EXCHANGER - PLATE TO PLATE

Next: End

NO IGNITION PRESSURE LOW

FAN

Next: End

POOR FLOW RATE

HEAT EXCHANGER - PLATE TO PLATE

Next: End

NO HOT WATER - NO SUPPLY TO HALL SENSOR

PCB

Next: End

NO HOT WATER

HALL SENSOR ASSEMBLY

Next: End

NO HOT WATER

HARNESS - LOW VOLTAGE

Next: End

NO HOT WATER - IGNORING SIGNAL FROM HALL SENSOR

PCB

Next: End

NO HOT WATER

SENSOR - THERMODISC - MINIFIT (RETURN)

Next: End

NO HOT WATER

PUMP

Next: End

FAULT E160 FAN RUNNING

PCB

Next: End

FIRING WITHOUT DEMAND DHW

HARNESS - LOW VOLTAGE

Next: End

FAULT E83

HALL SENSOR ASSEMBLY

Next: End

FAULT E83

Z REDIRECT

Next: End

FAULT E83 EBUS / LOW VOLTAGE FITTED

HALL SENSOR ASSEMBLY

Next: End

FAULT E83 EBUS / LOW VOLTAGE FITTED

Z REDIRECT

Next: End

BLANK FOR E85

Z REDIRECT

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRING WITHOUT DEMAND FLOW

HARNESS - LOW VOLTAGE

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRE WITH NO DEMAND

PCB

Next: End

LOW VOLTAGE OR EBUS CONTROLSFIRING WITHOUT DEMAND DHW

HARNESS - LOW VOLTAGE

Next: End

NOT RESPONDING TO CH DEMAND

PCB

Next: End

NOT STOP SPARKING

BURNER

Next: End

NOT STOP SPARKING - SIGNAL FROM RECT

PCB

Next: End

ALT DIFFERENTIAL TEST

Z REDIRECT

Next: End

WATER COOL RADS COOL

HEAD - MOTOR - 3 WAY VALVE

Next: End

WATER COOL RADS COOL

CARTRIDGE - 3 WAY VALVE

Next: End

FAN NOT RUNNING

FAN

Next: End

DHW TURNED OFF OR TEMPERATURE SET TOO LOW - ABLE TO CORRECT

CHARACTERISTIC TEST FROM OBSERVATION DHW SET TEMP

Next: !p1497

DHW TURNED OFF OR TEMPERATURE SET TOO LOW - WILL NOT ADJUST

CHARACTERISTIC TEST FROM OBSERVATION DHW SET TEMP

Next: !p1499

OCCURS ON HOT WATER NOT HEATING

CHARACTERISTIC TEST FROM OBSERVATION FAULT OCCURED ON WHICH DEMAND

Next: p1506

OCCURS ON HEATING DEMAND NOT HOT WATER

CHARACTERISTIC TEST FROM OBSERVATION FAULT OCCURED ON WHICH DEMAND

Next: p1528

SHORT CIRCUIT / LOW RESISTANCE MEASURED ON TEST 2

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: !p1654

SHORT CIRCUIT / LOW RESISTANCE MEASURED ON TEST 1

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: p1646

INLET PRESSURE LOW OR DIES AWAY DURING IGNITION

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p1829

INLET PRESSURE DOES NOT DROP DURING IGNITION

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p1831

FAN DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p1849

VENTURI DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p1851

FAN DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p1947

VENTURI DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p1949

BOILER IS NOISY IN HEATING OPERATION

CHARACTERISTIC TEST FROM OPERATION CENTRAL HEATING

Next: p2111

FAN DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2125

VENTURI DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2127

BOILER GETS HOT BUT RADIATORS DO NOT

CHARACTERISTIC TEST FROM OPERATION CENTRAL HEATING

Next: p2143

SYSTEM PRESSURE RISE IS EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CENTRAL HEATING

Next: p2171

SHUTS DOWN BEFORE BOILER OR RADS GET WARM

CHARACTERISTIC TEST FROM OPERATION CENTRAL HEATING

Next: p2175

CH TEMPERATURE SET TOO LOW - ABLE TO CORRECT

CHARACTERISTIC TEST FROM OBSERVATION CH SET TEMP

Next: !p2179

CH TEMPERATURE SET TOO LOW - WILL NOT ADJUST

CHARACTERISTIC TEST FROM OBSERVATION CH SET TEMP

Next: !p2181

HEATING TURNED OFF OR TEMPERATURE SET TOO LOW - ABLE TO CORRECT

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: !p2253

HEATING TURNED OFF OR TEMPERATURE SET TOO LOW - WILL NOT ADJUST

CHARACTERISTIC TEST FROM RESISTANCE MAINS INTO BOILER

Next: !p2255

SENSOR CLEAR - MANIFOLD BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR BLOCKAGE

Next: !p2306

SENSOR AND MANIFOLD CLEAR

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR BLOCKAGE

Next: !p2308

BOILER GOES TO OVERHEAT - TEMPERATURE BELOW 82°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

Next: !p2466

BOILER FLOW TEMPERATURE EXCEEDS 90°C AND BOILER STILL FIRED

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

Next: !p2465

MAINS VOLTAGE PRESENT ON BLACK WIRE BUT NOT ON BLUE WIRE

CHARACTERISTIC TEST FROM VOLTAGE EXTERNAL CONTROLS

Next: !p2506

MAINS VOLTAGE ABSENT ON BOTH WIRES

CHARACTERISTIC TEST FROM VOLTAGE EXTERNAL CONTROLS

Next: p2508

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE INTERNAL CLOCK

Next: !p2516

VOLTAGE NOT PRESENT ON TEST 2 (BUT PRESENT ON TEST 1)

CHARACTERISTIC TEST FROM VOLTAGE INTERNAL CLOCK

Next: !p2517

FAN RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER ENTERS STANDBY MODE

Next: p2696

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER ENTERS STANDBY MODE

Next: p2525

DISPLAY BLANK

CHARACTERISTIC TEST FROM OBSERVATION BOILER ENTERS STANDBY MODE

Next: p2527

PUMP RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER ENTERS STANDBY MODE

Next: p2529

DHW TURNED OFF OR TEMPERATURE SET TOO LOW - ABLE TO CORRECT

CHARACTERISTIC TEST FROM OBSERVATION DHW SET TEMP

Next: !p2615

DHW TURNED OFF OR TEMPERATURE SET TOO LOW - WILL NOT ADJUST

CHARACTERISTIC TEST FROM OBSERVATION DHW SET TEMP

Next: !p2617

FAN DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2658

VENTURI DAMAGED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2660

PRESSURE ON GAUGE OK BUT DOES NOT CHANGE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2670

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2672

PRESSURE ON GAUGE OK BUT DOES NOT CHANGE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2783

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2785

PRESSURE ON GAUGE OK BUT DOES NOT CHANGE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2788

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE

Next: !p2790

VOLTAGE NOT AS ABOVE ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE FLOW TURBINE

Next: !p2847

VOLTAGE NOT AS ABOVE ON TEST 2 (BUT OK ON TEST 1)

CHARACTERISTIC TEST FROM VOLTAGE FLOW TURBINE

Next: p2867

LIGHTS BUT BAFFLES / DROPS OUT OR IS NOISY

CHARACTERISTIC TEST FROM OBSERVATION BURNER LIGHTS AND ESTABLISHES

Next: p1864

DOES NOT LIGHT

CHARACTERISTIC TEST FROM OBSERVATION BURNER LIGHTS AND ESTABLISHES

Next: p1888

LIGHTS BUT DOES NOT STOP SPARKING

CHARACTERISTIC TEST FROM OBSERVATION BURNER LIGHTS AND ESTABLISHES

Next: p1428

DHW IS TOO HOT

CHARACTERISTIC TEST FROM OPERATION HOT WATER

Next: p540

TEMPERATURE RISE TOO LOW RADS COOL

CHARACTERISTIC TEST FROM OPERATION HOT WATER

Next: p2612

TEMPERATURE RISE TOO LOW RADS HOT

CHARACTERISTIC TEST FROM OPERATION HOT WATER

Next: p544

BOILER IS NOISY IN DHW OPERATION OR RUNS HOT COLD

CHARACTERISTIC TEST FROM OPERATION HOT WATER

Next: p2650

30/05/2019 11:16:55 1905_1_50_1 01/07/2019 10:08:21

26/06/2019 09:29:33

Next: End

RESISTANCE TEMPERATURE SENSOR FLUE AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p1081, f1082

RESISTANCE TEMPERATURE SENSOR FLUE SEC HARNESS

DISCONNECT THE INLINE PLUG HALF WAY ALONG THE HARNESS TO THE FLUE SENSOR (NEAR THE SPARK GENERATOR)

Next: !p1083, f1084

RESISTANCE HARNESS FLUE SENSOR UPPER

DISCONNECT THE INLIN

Next: !p1353, !f1354

RESISTANCE THERMOSTAT OVERHEAT

DISCONNECT THE TWO BLUE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p1089, !f1090

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2478, f1195

RESISTANCE TEMPERATURE SENSOR RETURN HARNESS

DISCONNECT THE HARNESS FROM THE RETURN SENSOR

Next: !p1197, !f1198

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2484, f1205

RESISTANCE OF FLOW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: !p1207, !f1208

RESISTANCE THERMOSTAT OVERHEAT AND HARNESS

DISCONNECT PLUG X14 FROM THE PCB

Next: p2053, f1230

RESISTANCE THERMOSTAT OVERHEAT

DISCONNECT THE TWO BLUE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p1231, !f1232

OBSERVATION FAULT OCCURRED ON WHICH DEMAND

Next: p1539, ?1501, ?1503

RESISTANCE TEMPERATURE SENSOR FLUE AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p1343, f1348

RESISTANCE TEMPERATURE SENSOR FLUE SEC HARNESS

DISCONNECT THE INLINE PLUG HALF WAY ALONG THE HARNESS TO THE FLUE SENSOR (NEAR THE SPARK GENERATOR)

Next: !p1350, f1349

RESISTANCE HARNESS FLUE SENSOR UPPER

DISCONNECT THE INLIN

Next: !p1351, !f1352

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: p2468, f1356

RESISTANCE DHW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE DHW SENSOR

Next: !p1359, !f1361

VOLTAGE DIVERTER VALVE TO HOT WATER

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p1514, !f1515

VOLTAGE DIVERTER HEATING

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p1531, !f1532

VOLTAGE DIVERTER VALVE TO HOT WATER

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p1547, !f1548

VOLTAGE PUMP FROM PCB

{USEINSMAT}
REMOVE PCB COVER

Next: p2720, !f1589

RESISTANCE MAINS INTO BOILER

REMOVE INTERNAL FUSES FROM THE TERMINAL BLOCK

Next: p2679, ?1641, ?1643

RESISTANCE DIVERTER VALVE

DISCONNECT CONNECTOR

Next: !p1649, !f1650

RESISTANCE HARNESS MAINS IN

DISCONNECT X10 FROM THE PCB

Next: !p1655, !f1656

RESISTANCE FAN

DISCONNECT 3 PIN PLUG FROM THE FAN

Next: !p1674, !f1661

RESISTANCE PUMP

DISCONNECT PLUG FROM THE PUMP

Next: !p1663, !f1664

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1672, !f1673

RESISTANCE SPARK GENERATOR

DISCONNECT PLUG ON THE SPARK GENERATOR

Next: !p1670, !f1671

RESISTANCE CLOCK MOTOR

REMOVE INTEGRAL CLOCK FROM APPLIANCE

Next: !p1676, !f1677

OBSERVATION SPARKING HEARD

GAS OFF
DISCONNECT THE IGNITION AND EARTH LEADS FROM THE SPARK GENERATOR

Next: p1717, f1699

VOLTAGE SPARK GENERATOR

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p1714, f1700

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p1701, !f1702

RESISTANCE GAS VALVE AND HARNESS

GAIN ACCESS TO THE PCB
DISCONNECT CONNECTOR X14 FROM THE PCB

Next: !p1834, f1835

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1836, !f1837

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1840, !f1841

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: p1951, !f1952

RESISTANCE TEMPERATURE SENSOR FLUE AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2042, f2043

RESISTANCE TEMPERATURE SENSOR FLUE SEC HARNESS

DISCONNECT THE INLINE PLUG HALF WAY ALONG THE HARNESS TO THE FLUE SENSOR (NEAR THE SPARK GENERATOR)

Next: !p2044, f2045

RESISTANCE HARNESS FLUE SENSOR UPPER

DISCONNECT THE INLIN

Next: !p2046, !f2047

RESISTANCE THERMOSTAT OVERHEAT

DISCONNECT THE TWO BLUE WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p2050, !f2051

INSPECTION SYSTEM PRESSURE

Next: p2070, ?2782, ?2784

RESISTANCE HARNESS PRESSURE SENSOR

DISCONNECT THE HARNESS FROM THE PRESSURE SENSOR

Next: p2303, !f2074

INSPECTION FLUE

Next: p2079, !f2080

VOLTAGE PCB TO FAN (LV)

DISCONNECT AND MAKE SAFE THE 4 WIRE LOW
VOLTAGE CONNECTOR FROM THE FAN

Next: p2089, !f2108

PRESSURE FAN

LOOSEN THE SCREW OF

Next: !p2114, f2115

INSPECTION AIR BOX

Next: p2116, !f2117

INSPECTION HEATING FILTER

DRAIN THE BOILERS HEATING CIRCUIT

Next: !p2134, !f2775

VOLTAGE DIVERTER HEATING

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p2146, !f2147

OBSERVATION CH SET TEMP

Next: p2931, ?2252, ?2254

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: !p2263, !f2264

OBSERVATION FAN RUNS

Next: p2275, f2088

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: !p2278, !f2279

VOLTAGE RECTIFICATION - AC - WITHOUT LEAD

GAIN ACCESS TO THE PCB
DISCONNECT CONNECTOR X1 FROM THE PCB

Next: p2281, f2309

VOLTAGE SOCKET AND SEE CHECK

GAIN ACCESS TO MAINS TERMINAL BLOCK

Next: !p2310, !f2311

RESISTANCE FAN AND HARNESS (LV)

GAIN ACCESS TO PCB
DISCONNECT CONNECTOR X23 FROM THE PCB

Next: p2472, f2398

INSPECTION HARNESS FAN (LV)

DISCONNECT THE 5 PIN CONNECTOR FROM THE FAN
DISCONNECT CONNECTOR X23 FROM THE PCB

Next: !p2399, !f2410

INSPECTION PCB AND CONNECTIONS

GAIN ACCESS TO PCB

Next: p2403, !f2408

VOLTAGE PUMP FROM PCB

{USEINSMAT}
REMOVE PCB COVER

Next: p2733, !f2423

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: !p2454, !f2455

VOLTAGE SWITCHED LIVE AT PCB

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: !p2491, f2492

VOLTAGE HEATING COMMON AT PCB

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p2493, !f2520

INSPECTION OF INTERNAL TIMER BYPASS LINK

REMOVE BLANKING PANEL FROM THE FRONT OF THE BOILER

Next: !p2497, !f2519

VOLTAGE HEATING COMMON AT PCB

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p2501, !f2518

RESISTANCE OF FLOW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: !p2532, !f2533

VOLTAGE MAINS INPUT (INPUT SIDE)

{USEINSMAT}
REMOVE THE PCB COVER

Next: p2536, f2537

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p2538, f2539

FUSE FURTHER INVESTIGATION

Next: !p2540, !f2541

RESISTANCE OF FLOW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: !p2558, !f2559

RESISTANCE DHW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE DHW SENSOR

Next: !p2874, !f2875

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: p2632, !f2633

INSPECTION OF CONDENSATE TRAP

Next: p2653, !f2654

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: !p2677, !f2678

RESISTANCE DIVERTER VALVE

DISCONNECT CONNECTOR

Next: !p2694, !f2695

OBSERVATION DISCONNECT PRESSURE SENSOR

RECONNECT X22 AT THE PCB
DISCONNECT THE CONNECTOR TO THE PRESSURE SENSOR AND MAKE SAFE

Next: !p2703, !f2704

VOLTAGE PUMP FROM PCB

{USEINSMAT}
REMOVE PCB COVER

Next: p2711, !f2710

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: !p2729, !f2730

INSPECTION HEATING FILTER

DRAIN THE BOILERS HEATING CIRCUIT

Next: !p2739, !f2740

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2777, !f2778

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: !p2795, !f2796

INSPECTION AIR BOX

Next: p2823, !f2832

INSPECTION SUFFICIENT MAINS WATER SUPPLY

Next: p2835, !f2836

VOLTAGE FLOW TURBINE

{USEINSMAT}
ENSURE NO HOT WATER DEMAND

Next: p2845, ?2846, ?2848

RESISTANCE DHW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE DHW SENSOR

Next: !p2856, !f2857

RESISTANCE TEMPERATURE SENSOR RETURN HARNESS

DISCONNECT THE HARNESS FROM THE RETURN SENSOR

Next: !p2860, !f2861

OBSERVATION LOW VOLTAGE / EBUS CONTROLS

Next: p2877, f2884

INSPECTION FLOW SWITCH HARNESS

DISCONNECT CONNECTOR X22 FROM THE PCB
UNCLIP FLOW SWITCH AND REMOVE CONNECTOR

Next: !p2880, !f2881

INFORMATION LOW VOLTAGE / EBUS CONTROLS

Next: p2887, !f2929

INSPECTION FLOW SWITCH HARNESS

DISCONNECT CONNECTOR X22 FROM THE PCB
UNCLIP FLOW SWITCH AND REMOVE CONNECTOR

Next: !p2890, !f2891

INFORMATION LOW VOLTAGE / EBUS CONTROLS

Next: p2896, !f2930

OBSERVATION DISCONNECT LOW VOLTAGE / EBUS CONTROLS

REMOVE THE WIRES FROM TERMINALS 1 & 2 ON M2 AND MAKE SAFE

Next: p2917, !f2928

RESISTANCE OF FLOW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: !p2922, !f2923

RESISTANCE DHW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE DHW SENSOR

Next: !p2926, !f2927

INFORMATION LOW VOLTAGE / EBUS CONTROLS

Next: !p2959, !f2960

RESISTANCE FLAME DETECTION LEAD

DISCONNECT FLAME DETECTION LEAD FROM THE FLAME DETECTION ELECTRODE

Next: p531, !f537

USING THE BOILER INFORMATION DISPLAY

OUTSIDE MODEL

Next: !p559, !f560

VOLTAGE DIVERTER VALVE TO HOT WATER

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p573, !f574

VOLTAGE PCB TO FAN (LV)

DISCONNECT AND MAKE SAFE THE 4 WIRE LOW
VOLTAGE CONNECTOR FROM THE FAN

Next: p879, f1080

OBSERVATION DHW SET TEMP

Next: p2842, ?1496, ?1498

RESISTANCE THERMOSTAT OVERHEAT AND HARNESS

DISCONNECT PLUG X14 FROM THE PCB

Next: !p1087, f1088

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p1323, !f1617

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2411, !f1616

INSPECTION FLUE

Next: p1345, !f1358

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: !p1347, !f1346

INSPECTION OF CONDENSATE TRAP

Next: p1929, !f1438

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: p1507, !f1614

OBSERVATION DIVERTER VALVE HEAD OPERATION

{USEINSMAT}
REMOV

Next: p1512, f1513

OBSERVATION PUMP RUNS DHW DEMAND

ENSURE APPLIANCE IS COOL
SET FLOW RATE TO APPROX. 3 LITRES A MINUTE

Next: p1518, f2708

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p1516, !f1517

PUMP LIMPET TEST

Next: p2715, !f2714

OBSERVATION DIVERTER VALVE HEAD OPERATION

{USEINSMAT}
REMOV

Next: p1529, f1530

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: p1535, !f2052

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p1533, !f1534

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: !p1537, !f1538

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: p1540, !f1612

OBSERVATION DIVERTER VALVE HEAD OPERATION

{USEINSMAT}
REMOV

Next: p1573, f1546

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p1549, !f1550

OBSERVATION PUMP RUNS DHW DEMAND

ENSURE APPLIANCE IS COOL
SET FLOW RATE TO APPROX. 3 LITRES A MINUTE

Next: p1590, f1588

PUMP LIMPET TEST

Next: p2726, !f2724

RESISTANCE PUMP AND HARNESS

DISCONNECT X11 AND X13 FROM THE PCB

Next: p1665, f1662

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT CONNECTOR X13 FROM THE PCB

Next: p1647, f1648

RESISTANCE FAN AND HARNESS (HV)

DISCONNECT X11 FROM THE PCB

Next: p1651, f1659

OBSERVATION IS INTEGRAL TIMER FITTED

Next: p1652, f1653

RESISTANCE CLOCK MOTOR AND HARNESS

DISCONNECT X10 FROM THE PCB

Next: !p1657, f1675

RESISTANCE GAS VALVE AND HARNESS

GAIN ACCESS TO THE PCB
DISCONNECT CONNECTOR X14 FROM THE PCB

Next: p1666, f1667

RESISTANCE SPARK GENERATOR AND HARNESS

GAIN ACCESS TO THE PCB
DISCONNECT CONNECTOR X14 FROM THE PCB

Next: !p1668, f1669

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: p2260, !f1704

RESISTANCE SPARK GENERATOR HARNESS

UNPLUG CONNECTOR X14 FROM THE PCB
UNPLUG THE CONNECTOR FROM THE SPARK GENERATOR

Next: !p1716, !f1715

RESISTANCE HT LEAD

UNPLUG THE HT LEAD FROM THE SPARK ELECTRODE

Next: p1718, !f1719

RESISTANCE ELECTRODE EARTH LEAD

DISCONNECT THE WHITE EARTH LEAD FROM THE IGNITION ELECTRODE

Next: p1720, !f1721

INSPECTION OF IGNITION ELECTRODES

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: !p1722, !f1723

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 WIR

Next: p1825, f2813

PRESSURE GAS INLET AND DROP

GAS OFF
LOOSEN TH

Next: p1826, ?1828, ?1830

INSPECTION AIR BOX

Next: p1844, !f1845

VOLTAGE GAS VALVE AT PCB

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p1832, f1833

RESISTANCE GAS VALVE AND HARNESS

GAIN ACCESS TO THE PCB
DISCONNECT CONNECTOR X14 FROM THE PCB

Next: !p1838, f1839

INSPECTION OF FAN AND FAN VENTURI

REMOVE BURNER\FAN ASSEMBLY FROM BOILER

Next: p1846, ?1848, ?1850

INSPECTION INJECTOR

UNDO THE NUT AT THE TOP OF THE GAS VALVE

Next: p1852, !f1853

INSPECTION OF IGNITION ELECTRODES

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: !p1854, !f1855

INSPECTION CONDENSATE TRAP

Next: p1865, !f1866

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 WIR

Next: p1867, f1950

PRESSURE GAS INLET

GAS OFF
LOOSEN TH

Next: p1880, !f1881

INSPECTION FLUE

Next: p1882, !f1883

INSPECTION AIR BOX

Next: p1944, !f1885

INSPECTION CONDENSATE TRAP

Next: p1824, !f1928

PRESSURE GAS INLET

GAS OFF
LOOSEN TH

Next: p420, !f1939

INSPECTION OF FAN AND FAN VENTURI

REMOVE BURNER\FAN ASSEMBLY FROM BOILER

Next: p1957, ?1946, ?1948

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: p1953, !f1954

INSPECTION FLUE

Next: !p1955, !f1956

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: !p1958, !f1959

RESISTANCE THERMOSTAT OVERHEAT AND HARNESS

DISCONNECT PLUG X14 FROM THE PCB

Next: p2481, f2049

OBSERVATION BOILER RESET (OVERHEAT)

ENSURE APPLIANCE IS COOL

Next: p2434, f2776

VOLTAGE PRESSURE SENSOR (FAULT CODE)

Next: !p2071, f2072

INSPECTION CONDENSATE TRAP

Next: p2081, !f2082

PRESSURE TIGHTNESS TEST

Next: !p2083, !f2084

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: p2101, !f2102

VOLTAGE PCB TO FAN (MAINS)

{USEINSMAT}
REMOVE PCB COVER

Next: p2103, !f2104

RESISTANCE HARNESS FAN (HV)

UNPLUG THE 3 WIRE PLUG FROM THE FAN

Next: !p2105, !f2106

INSPECTION GAS RATE

Next: p2762, f2113

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: p2132, f2133

INSPECTION OF CONDENSATE TRAP

Next: p2118, !f2119

INSPECTION OF FAN AND FAN VENTURI

REMOVE BURNER\FAN ASSEMBLY FROM BOILER

Next: p2122, ?2124, ?2126

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: p2128, !f2129

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: !p2130, !f2131

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: p2138, !f2139

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: !p2140, !f2141

OBSERVATION DIVERTER VALVE HEAD OPERATION

{USEINSMAT}
REMOV

Next: p2144, f2145

INSPECTION DIVERTER VALVE PIN MOVEMENT

REMOVE THE ACTUATOR HEAD FROM THE DIVERTER VALVE

Next: p2150, !f2151

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p2148, !f2149

INSPECTION ISOLATION VALVES

Next: p2152, !f2153

INSPECTION BYPASS OPERATION

DRAIN THE BOILERS HEATING CIRCUIT

Next: p2154, !f2155

INSPECTION HEATING FILTER

DRAIN THE BOILERS HEATING CIRCUIT

Next: !p2156, !f2157

PRESSURE EXPANSION VESSEL

REMOVE THE CAP FROM THE EXPANSION VESSEL SCHRADER VALVE
DRAIN THE BOILER CENTRAL HEATING CIRCUIT

Next: !p2172, !f2173

OBSERVATION CH SET TEMP

Next: p2176, ?2178, ?2180

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: p2182, !f2183

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: !p2184, !f2185

VOLTAGE FAN HALL SENSOR

Next: !p2261, f2262

VOLTAGE FAN HALL SENSOR

Next: p2864, f2277

INSPECTION FLAME DETECTION LEAD

Next: !p2283, !f2284

INSPECTION PRESSURE SENSOR BLOCKAGE

DRAIN THE HEATING CIRCUIT

Next: !p2791, ?2305, ?2307

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2404, !f2409

OBSERVATION PUMP RUNS DHW DEMAND

ENSURE APPLIANCE IS COOL
SET FLOW RATE TO APPROX. 3 LITRES A MINUTE

Next: p2741, f2421

INSPECTION SYSTEM PRESSURE

Next: p1229, ?2787, ?2789

TEMPERATURE DIFFERENTIAL (PRIMARY)

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS SHOWN

Next: p2458, f2453

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: p2460, f2738

OBSERVATION RUN BOILER UP TO TEMP - DOES OVERHEAT OCCUR

ATTACH TEMPERATURE CLAMP TO THE FLOW PIPE AS SHOWN

Next: !p2461, ?2462, ?2464

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2469, !f2470

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2473, !f2474

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2479, !f2480

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2482, !f2483

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2485, !f2486

OBSERVATION TYPE OF HEATING CONTROLS FITTED

Next: p2489, f2490

VOLTAGE SWITCHED LIVE AT PCB

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: !p2499, f2500

RESISTANCE HARNESS X12 TO MAINS TERMINAL

DISCONNECT CONNECTOR X12 FROM THE PCB

Next: !p2495, f2496

VOLTAGE EXTERNAL CONTROLS

Next: !p2514, ?2505, ?2507

VOLTAGE INTERNAL CLOCK

GAIN ACCESS TO THE 4 WIRE CONNECTOR ON THE LEFT OF THE PCB

Next: !p2515, ?2510, ?2512

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: p2560, !f2561

TEMPERATURE AMBIENT

Next: p2900, !f2551

MAINS VOLTAGE INPUT (BOILER SIDE)

{USEINSMAT}
REMOVE THE PCB COVER

Next: p2534, f2535

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: !p2530, f2531

VOLTAGE MAINS INPUT AT PCB

Next: p2544, !f2545

FUSE FURTHER INVESTIGATION

Next: !p2542, !f2543

VOLTAGE TO DISPLAY PCB

{USEINSMAT}
REMOV

Next: p2546, !f2547

RESISTANCE HARNESS DISPLAY PCB

DISCONNECT THE DISPLAY HARNESS FROM X40 ON THE MAIN PCB AND AT THE DISPLAY BOARD

Next: !p2548, !f2549

VOLTAGE EXTERNAL CONTROLS (NO DEMAND)

{USEINSMAT}
GAIN ACCESS TO MAIN TERMINAL BLOCK

Next: p2552, !f2553

OBSERVATION ISOLATE DHW

TURN THE DHW ISOLATION VALVE OFF

Next: p2554, !f2555

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2564, f2557

VOLTAGE PCB TO FAN (LV)

DISCONNECT AND MAKE SAFE THE 4 WIRE LOW
VOLTAGE CONNECTOR FROM THE FAN

Next: !p2562, !f2563

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: !p2565, f2567

OBSERVATION DHW SET TEMP

Next: p2613, ?2614, ?2616

INSPECTION OF CONDENSATE TRAP

Next: p2618, !f2619

OBSERVATION BOILER HOT WATER OUTPUT TEMPERATURE

ATTACH TEMPERATURE PROBE TO THE HOT WATER OUTPUT PIPE OF THE BOILER

Next: p2620, !f2621

PUMP LIMPET TEST

Next: p2622, !f2623

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2624, !f2625

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: p2626, !f2627

RESISTANCE TEMPERATURE SENSOR FLUE AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2628, !f2629

PRESSURE FAN MAXIMUM

DISCONNECT THE 4 WIR

Next: p2630, f2631

PRESSURE GAS INLET

GAS OFF
LOOSEN TH

Next: p2792, !f2639

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: p2634, !f2635

INSPECTION FLUE

Next: !p2636, !f2637

PRESSURE FAN

LOOSEN THE SCREW OF

Next: p2651, f2652

INSPECTION SYSTEM PRESSURE

Next: p2667, ?2669, ?2671

INSPECTION OF FAN AND FAN VENTURI

REMOVE BURNER\FAN ASSEMBLY FROM BOILER

Next: p2655, ?2657, ?2659

INSPECTION AIR BOX

Next: p2661, !f2662

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: p2663, !f2664

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: !p2665, !f2666

PUMP LIMPET TEST

Next: p2673, !f2674

TEMPERATURE DIFFERENTIAL (PRIMARY)

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS SHOWN

Next: !p2675, f2676

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT CONNECTOR X13 FROM THE PCB

Next: p1645, f2693

OBSERVATION DISCONNECT X22

DISCONNECT CONNECTOR X22 FROM THE PCB AND MAKE SAFE

Next: p2523, f2702

RESISTANCE PUMP HARNESS

DISCONNECT THE PLUG FROM THE PUMP

Next: !p2712, !f2713

TEMPERATURE DIFFERENTIAL (PRIMARY)

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS SHOWN

Next: !p2716, !f2717

RESISTANCE PUMP HARNESS

DISCONNECT THE PLUG FROM THE PUMP

Next: !p2721, !f2722

TEMPERATURE DIFFERENTIAL (PRIMARY)

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS SHOWN

Next: p2727, f2728

TEMPERATURE DIFFERENTIAL (HEATING)

ATTACH TEMPERATURE C

Next: !p2731, !f2732

RESISTANCE PUMP HARNESS

DISCONNECT THE PLUG FROM THE PUMP

Next: !p2734, !f2735

PUMP LIMPET TEST

Next: p2451, !f2759

PUMP LIMPET TEST

Next: p2112, !f2774

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: !p2780, !f2779

TEMPERATURE DIFFERENTIAL (PRIMARY)

ATTACH TEMPERATURE CLAMPS TO PRIMARY FLOW AND RETURN AS SHOWN

Next: !p2793, f2794

INSPECTION INJECTOR

UNDO THE NUT AT THE TOP OF THE GAS VALVE

Next: p2824, !f2825

INSPECTION MAIN BURNER

REMOVE THE FULL BURNER AND FAN ASSEMBLY FROM THE APPLIANCE

Next: p2826, !f2827

INSPECTION OF MAIN HEAT EXCHANGER

REMOVE FAN/BURNER ASSEMBLY

Next: p2828, !f2829

INSPECTION FLUE

Next: !p2830, !f2831

INSPECTION DHW ISOLATION VALVE

Next: p2837, !f2838

INSPECTION MAINS WATER FILTER AND RESTRICTOR

ISOLATE THE COLD WATER SUPPLY TO THE BOILER
DRAIN THE HOT WATER CIRCUIT

Next: !p2839, !f2840

VOLTAGE PUMP FROM PCB

{USEINSMAT}
REMOVE PCB COVER

Next: p2843, f2844

RESISTANCE PUMP HARNESS

DISCONNECT THE PLUG FROM THE PUMP

Next: !p2862, !f2863

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: p2854, f2855

INSPECTION WATER FLOW TURBINE

ISOLATE THE COLD WATER SUPPLY TO THE BOILER
DRAIN THE HOT WATER CIRCUIT

Next: p2850, !f2851

RESISTANCE DHW HALL SENSOR HARNESS

UNCLIP THE HALL SENSOR FROM BELOW THE TURBINE THEN DISCONNECT THE HARNESS FROM THE HALL SENSOR

Next: !p2852, !f2853

RESISTANCE TEMPERATURE SENSOR RETURN AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: !p2858, f2859

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: !p2865, !f2866

OBSERVATION ISOLATE DHW (NO PUMP)

TURN THE DHW ISOLATION VALVE OFF

Next: p2849, !f2873

RESISTANCE FLOW SWITCH AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2878, f2879

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2882, !f2883

RESISTANCE FLOW SWITCH AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2888, f2889

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2892, !f2893

OBSERVATION BOILER RESET (FAULT CODE)

Next: !p2898, !f2899

OBSERVATION LOW VOLTAGE / EBUS CONTROLS

Next: p2550, f2914

OBSERVATION ISOLATE DHW

TURN THE DHW ISOLATION VALVE OFF

Next: p2918, !f2919

RESISTANCE OF FLOW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X22 FROM THE PCB

Next: p2920, f2921

RESISTANCE DHW TEMPERATURE SENSOR AND HARNESS

DISCONNECT PLUG X21 FROM PCB

Next: !p2924, f2925

OBSERVATION LOW VOLTAGE / EBUS CONTROLS

Next: p2488, f2958

VOLTAGE RECTIFICATION - AC

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: p529, f2280

VOLTAGE RECTIFICATION - DC

{USEINSMAT}
GAIN ACCESS TO THE PCB

Next: !p535, f530

INSPECTION OF FLAME DETECTION ELECTRODE

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: !p532, !f533

RESISTANCE SENSOR FLOW

DISCONNECT THE HARNESS PLUG FROM THE FLOW THERMISTOR

Next: p547, !f1605

OBSERVATION DIVERTER VALVE HEAD OPERATION

{USEINSMAT}
REMOV

Next: !p577, f572

RESISTANCE DHW TEMPERATURE SENSOR

DISCONNECT THE HARNESS PLUG FROM THE DHW SENSOR

Next: !p2571, !f1607

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p575, !f576

RESISTANCE HARNESS FAN (LV)

DISCONNECT THE 4 WIRE PLUG FROM THE FAN

Next: p880, !f891

VOLTAGE PCB TO FAN (MAINS)

{USEINSMAT}
REMOVE PCB COVER

Next: p892, !f886

RESISTANCE HARNESS FAN (HV)

UNPLUG THE 3 WIRE PLUG FROM THE FAN

Next: !p893, !f894

System Information

  • Total Tests: 690
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control