XSol Diagnostic System

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:

WORCESTER GREENSTAR JUNIOR (NO ON/OFF SWITCH, HAS TRANSFORMER)

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

WORCESTER GREENSTAR JUNIOR

CASE REMOVAL<

Next: &2594, !f2

DHW FLOW RATE

Next: &2367, f2596

DHW OPERATION

Next: &148, ?96, ?98, ?100, ?102, ?671, ?2089

CH OPERATION

CH TEMPERATURE CONTROL SET TO MAX

Next: &183, ?149, ?151, ?715

PUMP OVERRUN

CH TEMPERATURE CONTROL SET TO MAX

Next: &185, !f184

SYPHON OPERATION

Next: &nff, !f186

DHW BURNER IGNITION & ESTABLISH

TURN HOT WATER TAP O

Next: &1826, ?318, ?322, ?986, ?1509, ?3187

ENHANCED FAULT CODES

SELECT APPROPRIATE FAULT CODE

Next: &1052, !f467

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &2286, !f471

MAXIMUM OUTPUT MODE

INSTRUCTIONS TO S

Next: &nff, !f701

FURTHER INVESTIGATION OVERHEAT

NOT USED

Next: &nff, f911

POWER UP

Next: &5, f1053

FURTHER INVESTIGATION FUSE BLOWN

NOT USED

Next: &nff, f2147

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: &1833, f2852

INLET PRESSURE MAX OUTPUT

ATTACH PRESSURE GAU

Next: &1835, !f1834

COMBUSTION ANALYSIS MAX AND MIN

UNCLIP DIVERTER VALVE HEAD FROM THE BODY AND LEAVE IN A SAFE POSITION

Next: &2294, ?1836, ?1838

CH OPERATION PERFORMANCE TEST FAIL

OUTSIDE OF MODEL

Next: &nff, f1880

OPERATIONAL SEQUENCE

NO LONGER USED

Next: &466, !f2288

CH DEMAND

CH TEMPERATURE CONTROL SET TO MAX
ENSURE BOILER IS NOT UP TO TEMPERATURE

Next: &95, f2301

INTERNAL FAULT

NOT USED

Next: &nff, f2335

PUMP RUNS PREHEAT

ENSURE PRIMARY HEAT EXCHANGER IS BELOW 40°C (TO ENSURE A DEMAND FOR PREHEAT)

Next: &317, f3017

VOLATILE LOCK OUT

NOT USED

Next: &nff, f3148

INFORMATION PREHEAT

1. THIS APPLI

Next: &470, !f2595

BURNER SEAL CHECK FOR OVERHEAT

OUTSIDE MODEL

Next: &nff, f2656

INFORMATION FAN PCB REMOVAL

Next: &nff, !f3298

INFORMATION FAN DEMAND VOLTAGE

THE PWM OR (DEMAND/S

Next: &nff, !f3395

BURNER BAFFLES OUT

FLUE

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (FUSED SPUR)

Next: End

LED AT POWER UP

PCB

Next: End

FAN DOES NOT RUN

Z DIRECTION

Next: End

BLOWN STANDBY MODE

FUSE - MAINS

Next: End

BLOWN STANDBY MODE

FUSE

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION

Next: End

BURNER IGNITION

TRANSFORMER

Next: End

DHW SENSOR

SENSOR - TEMPERATURE - DHW

Next: End

PRIMARY TEST

INLET PRESSURE

Next: End

PUMP OVERRUN

PCB

Next: End

SYPHON

SYPHON

Next: End

TURBINE

HARNESS - MAINS

Next: End

FAN DOES NOT RUN

SENSOR - TEMPERATURE - DHW

Next: End

ELECTRICAL SAFETY

ELECTRICAL SAFETY CHECKS

Next: End

HEAT EXCHANGER NOISY

PUMP

Next: End

PUMP PULSES

SYSTEM PRESSURE

Next: End

PULSES ON OFF

PUMP

Next: End

PUMP PULSES 2

SENSOR - CONTROL

Next: End

PUMP PULSES 2

SENSOR - TEMPERATURE - DHW

Next: End

BAFFLES OUT

TUBE GAS SUPPLY

Next: End

FUSE FURTHER INVESTIGATION

FLOW SENSOR ASSEMBLY

Next: End

PUMP - DHW COOL RADS COOLPUMP RUNNING PRE TEST OVERHEAT

PCB

Next: End

DHW COOL RADS COOLPUMP RUNNING PRE TEST OVERHEAT

CABLE - PUMP

Next: End

OPERATIONAL SEQUENCE

DIRECTION CHOICE OR CONTINUE

Next: End

PUMP PULSING

HEAT EXCHANGER ASSEMBLY

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

INTERNAL CLOCK2DHW NOISY

PCB

Next: End

EXTERNAL CONTROLS INPUT (DHW)DHW NOISY

Next: End

FAN DOES NOT RUN

SENSOR - CONTROL

Next: End

INTERNAL FAULT

Z DIRECTION

Next: End

FURTHER INVESTIGATION

GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1 FURTHER INVESTIGATION

PUMP

Next: End

FURTHER INVESTIGATION FURTHER INVESTIGATION

TRANSFORMER

Next: End

COMBUSTION INCORRECT

TUBE GAS SUPPLY

Next: End

DROP OUT MIN MODE

TUBE GAS SUPPLY

Next: End

CH PERFORMANCE FAIL2

TUBE GAS SUPPLY

Next: End

INFORMATION PREHEAT

Z DIRECTION

Next: End

DHW FLOW RATE

MAINS WATER SUPPLY

Next: End

BURNER DOES NOT ESTABLISH

SYPHON

Next: End

FAN DOES NOT RUN

CODE PLUG

Next: End

INTERNAL CLOCKDHW NOISY

PCB

Next: End

DHW COOL RADS HOT DIVERTER MOTOR SWITCHING

PCB

Next: End

BOILER UP TO TEMP RADS DO NOT HEAT DIVERTER MOTOR SWITCHING

PCB

Next: End

BURNER SEAL FOR OVERHEAT

FLUE / BURNER SEALS

Next: End

DHW COOL RADS HOT DIVERTER MOTOR SUPPLY

PCB

Next: End

DHW COOL RADS HOT

HARNESS - STEPPER MOTOR

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT DIVERTER MOTOR SUPPLY

PCB

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT

HARNESS - STEPPER MOTOR

Next: End

DOES NOT ESTABLISH - FLAME SENSE SHORTING TO EARTH

HARNESS - MAINS

Next: End

DOES NOT ESTABLISH

TUBE GAS SUPPLY

Next: End

FLAME SENSE BURNER IGNITES

HARNESS - MAINS

Next: End

BURNER IGNITES

ELECTRODE

Next: End

DOES NOT ESTABLISH 2

BURNER

Next: End

FAN DOES NOT RUN

EXTERNAL MIXING

Next: End

BURNER BAFFLES OUT 1

FLUE

Next: End

BAFFLES OUT 2

TUBE GAS SUPPLY

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

DOES NOT IGNITE

SENSOR - TEMPERATURE - DHW

Next: End

BURNER IGNITES

SYPHON

Next: End

BURNER IGNITES

INLET PRESSURE

Next: End

BURNER IGNITES

LEAD - IGNITION

Next: End

BURNER DOES NOT IGNITE

TUBE GAS SUPPLY

Next: End

BURNER IGNITES

ELECTRODE

Next: End

DOES NOT IGNITE PRESSURE DROPS

BURNER

Next: End

DOES NOT IGNITE

PRIMARY HEAT EXCHANGER

Next: End

FAN PRESSURE TEST

SYPHON

Next: End

FAN PRESSURE TEST

TUBE GAS SUPPLY

Next: End

PRIMARY PRE TEST FAN PRESSURE

BURNER

Next: End

DHW COOL RADS COOL

EXTERNAL MIXING

Next: End

DHW COOL

PUMP

Next: End

OVERHEAT

SENSOR - CONTROL

Next: End

OVERHEAT

SENSOR - TEMPERATURE - DHW

Next: End

OVERHEAT

HEAT EXCHANGER ASSEMBLY

Next: End

OVERHEAT

LIMITER 120°C - TEMPERATURE

Next: End

FUSE INVESTIGATION

TIMER - MECHANICAL - MT10

Next: End

BURNER DOES IGNITE FAULTY SOLENOID

GAS VALVE

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

DOES NOT IGNITE 2

TUBE GAS SUPPLY

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

DOES NOT IGNITE

TUBE GAS SUPPLY

Next: End

NO VOLTAGE 1

PCB AND GAS VALVE

Next: End

BURNER DOES NOT IGNITE

PCB-HARNESS (MAIN)

Next: End

BURNER DOES NOT IGNITE NO DROPFAN RUNS OVERHEAT 1

LIMITER 120°C - TEMPERATURE

Next: End

BURNER DOES NOT IGNITE NO DROP

LIMITER - TEMPERATURE

Next: End

FAN RUNS

LIMITER 120°C - TEMPERATURE

Next: End

BURNER IGNITION

LIMITER - TEMPERATURE

Next: End

FAN RUNS OVERHEAT 1

LIMITER 120°C - TEMPERATURE

Next: End

FLUE OVERHEAT

BURNER

Next: End

FLUE OVERHEAT

PRIMARY HEAT EXCHANGER

Next: End

DHW TOO COOL

HEAT EXCHANGER ASSEMBLY

Next: End

DHW TOO COOL 2

SENSOR - TEMPERATURE - DHW

Next: End

DHW TO COOL

SENSOR - CONTROL

Next: End

DHW FLOW RATE

ISOLATION VALVES

Next: End

STUCK IN DHW

DIVERTER VALVE ASSEMBLY

Next: End

PREVENTING PREHEAT

DT20 / DT20RF

Next: End

PUMP DOES NOT RUN DT20

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN DT20

SENSOR - TEMPERATURE - DHW

Next: End

PREHEAT DT20

CABLE - PUMP

Next: End

PUMP DOES NOT RUN

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN

SENSOR - TEMPERATURE - DHW

Next: End

PREHEAT

CABLE - PUMP

Next: End

DOES NOT ESTABLISH

BURNER

Next: End

BURNER IGNITES BUT NOT ESTABLISH

FLUE

Next: End

FAN PRESSURE PRIMARY TEST

FLUE

Next: End

CH PERFORMANCE FAIL

TUBE GAS SUPPLY

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

BURNER

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

FLUE

Next: End

FAN DOES NOT RUNFAULT CODE

CODE PLUG

Next: End

FAN DOES NOT RUN 1FAULT CODE

SENSOR - CONTROL

Next: End

VOLATILE LOCKOUTFAULT CODE

SENSOR - TEMPERATURE - DHW

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT - LOW PRESSURE

SYPHON

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

FLUE

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT 3

TUBE GAS SUPPLY

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

BURNER

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

INLET PRESSURE

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT WRONG COMBUSTION

TUBE GAS SUPPLY

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT WRONG COMBUSTION DROPS MINIMUM

TUBE GAS SUPPLY

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT - POOR SPARK

PCB

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

SYPHON

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT- HIGH RESIST

LIMITER - TEMPERATURE (CORROSION)

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT 2

TUBE GAS SUPPLY

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

HARNESS - MAINS

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

LEAD - IGNITION

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

ELECTRODE

Next: End

FAN DOES NOT RUN - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN VOLTAGE PCB - NEW STYLE FAN

PCB

Next: End

FAN RUNS - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN RUNS

CABLE FAN CONNECTOR ASSEMBLY

Next: End

DOES NOT RUN

FAN

Next: End

FAN VOLTAGE PCB

PCB

Next: End

FAN DOES NOT RUN

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN RUNS

FAN

Next: End

BETWEEN 125 VAC AND 135 VAC - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

ABOVE 135 VAC - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

STSLOW THEN TO TO HIGH SPEED - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

BETWEEN 125 VAC AND 135 VAC

CABLE FAN CONNECTOR ASSEMBLY

Next: End

ABOVE 135 VAC

CABLE FAN CONNECTOR ASSEMBLY

Next: End

SLOW THEN TO HIGH SPEED

FAN

Next: End

STSLOW THEN TO TO HIGH SPEED

CABLE FAN CONNECTOR ASSEMBLY

Next: End

BELOW 124 VAC

FAN

Next: End

INFORMATION FAN PCB REMOVAL

Z DIRECTION

Next: End

FUSE INVESTIGATION - INCOMPATIBLE

FAN

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

VOLATILE LOCKOUT FAN RUNS 1 - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT FAN RUNS 1 - NEW STYLE FAN

PCB

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN RUNS1 FAULT CODE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN VOLTAGE PCB1 FAULT CODE

PCB

Next: End

FAN DOES NOT RUN1 FAULT CODE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FAN RUNS1 FAULT CODE

FAN

Next: End

VOLATILE LOCKOUT BETWEEN 125 VAC AND 135 VAC - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT ABOVE 135 VAC - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT STSLOW THEN TO TO HIGH SPEED - NEW STYLE

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT BETWEEN 125 VAC AND 135 VAC

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT ABOVE 135 VAC

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED

FAN

Next: End

VOLATILE LOCKOUT STSLOW THEN TO TO HIGH SPEED

CABLE FAN CONNECTOR ASSEMBLY

Next: End

VOLATILE LOCKOUT BELOW 124 VAC

FAN

Next: End

DOES NOT RUN1 FAULT CODE

FAN

Next: End

240V ON ALL FAN CONNECTIONS 3

PCB

Next: End

240V ON ALL FAN CONNECTIONS 4

PCB

Next: End

240V ON ALL FAN CONNECTIONS

PCB

Next: End

240V ON ALL FAN CONNECTIONS 2

PCB

Next: End

BLANK FOR FAN DEMAND INFORMATION

Z DIRECTION

Next: End

DOES NOT ESTABLISH

INLET PRESSURE

Next: End

FAULT CODES

ENHANCED FAULT CODES

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

DHW TOO COOL

SENSOR - TEMPERATURE - DHW

Next: End

HOT THEN COLD

HEAT EXCHANGER - PLATE

Next: End

DHW HOT THEN COLD

SENSOR - CONTROL

Next: End

DHW HOT THEN COLD

PUMP

Next: End

MAXIMUM OUTPUT INSTRUCTIONS

MAXIMUM OUTPUT INSTRUCTIONS

Next: End

EXPANSION VESSEL

EXPANSION VESSEL

Next: End

DHW COOL

SYSTEM PRESSURE

Next: End

DHW NOISY

SYSTEM PRESSURE

Next: End

DHW HOT THEN COLD

SYSTEM PRESSURE

Next: End

CH NOISY

PUMP

Next: End

CH NOISY

SENSOR - CONTROL

Next: End

CH NOISY

SYSTEM PRESSURE

Next: End

RADS DO NOT HEAT

SYSTEM PRESSURE

Next: End

RADS DO NOT HEAT

PUMP

Next: End

RADS DO NOT HEAT

ISOLATION VALVES

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT

PUMP

Next: End

RADS COLD

VALVE - BYPASS

Next: End

BURNER BAFFLES OUT

SYPHON

Next: End

BURNER BAFFLES OUT

INLET PRESSURE

Next: End

BURNER BAFFLES OUT

GAS VALVE

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION FUSED SPUR

Z DIRECTION

Next: End

DHW COOL RADIATORS HOT

DIVERTER VALVE ASSEMBLY

Next: End

FURTHER INVESTIGATION LED PCB FAULT TO FAN RUNS BURNER IGNITES AND ESTABLISHES

Z DIRECTION

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION

Next: End

FURTHER INVESTIGATION F3

Z DIRECTION

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE

Next: End

TRANSFORMER

PCB

Next: End

DHW TOO HOT

PCB

Next: End

DHW TOO HOT

HARNESS - MAINS

Next: End

CH NOISY

PCB

Next: End

CH NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

CH NOISY

Next: End

FAN SIGNAL

PCB

Next: End

FLOW SENSOR FAN RUNS 2

HARNESS - MAINS

Next: End

DHW SENSOR FAN DOES NOT RUN

HARNESS - MAINS

Next: End

PUMP PULSES

HEAT EXCHANGER - PLATE

Next: End

DHW COOL RADIATORS COOLPUMP RUNNING PRE TEST OVERHEAT

PUMP

Next: End

CH OPERATION DHWDHW NOISY

HEATING CONTROLS

Next: End

EXTERNAL CONTROLS RETURNDHW NOISY

Next: End

CH OPERATION (DHW)DHW NOISY

HEATING CONTROLS

Next: End

INTERNAL FAULT

DIRECTION CHOICE OR CONTINUE

Next: End

GAS VALVE BURNER IGNITES 1FURTHER INVESTIGATION

HARNESS - MAINS

Next: End

FURTHER INVESTIGATION FUSE F1 FURTHER INVESTIGATION

CABLE - PUMP

Next: End

FURTHER INVESTIGATION FUSE F1 FURTHER INVESTIGATION

CABLE FAN CONNECTOR ASSEMBLY

Next: End

CO2 SETTINGS INCORRECT

GAS VALVE SETTING RETEST

Next: End

DROPS OUT ON MINIMUM

GAS VALVE SETTING

Next: End

CH OP PT FAIL

GAS VALVE SETTING RETEST

Next: End

FLOW RATE

HEAT EXCHANGER - PLATE

Next: End

FLOW RATE

FLOW SENSOR ASSEMBLY

Next: End

FLOW RATE

FILTER - INSERT - DHW

Next: End

FLOW RATE

FLOW REGULATOR

Next: End

FLOW RATE

NOZZLE

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB

Next: End

FLAME SENSE

PCB

Next: End

OVERHEAT OCCURED

NORMAL OPERATION

Next: End

DHW COOL RADS HOT ELECTRICAL FAULT

MOTOR - DIVERTER VALVE

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT ELECTRICAL FAULT

MOTOR - DIVERTER VALVE

Next: End

SHORTING TO EARTH

ELECTRODE

Next: End

BURNER DOES NOT ESTABLISH

GAS VALVE

Next: End

ELECTRICAL

FLOW SENSOR ASSEMBLY

Next: End

BAFFLES OUT

MEMBRANE

Next: End

BAFFLES OUT

FAN

Next: End

BURNER BAFFLES OUT

PRIMARY HEAT EXCHANGER

Next: End

NOT IGNITING WITH DROP

MEMBRANE

Next: End

NOT IGNITING WITH DROP

FAN

Next: End

BURNER DOES NOT IGNITE

GAS VALVE

Next: End

FAN PRESSURE TEST

MEMBRANE

Next: End

FAN PRESSURE TEST

FAN

Next: End

OVERHEAT

HEAT EXCHANGER - PLATE

Next: End

OVERHEAT

PCB

Next: End

OVERHEAT 2

LIMITER - TEMPERATURE

Next: End

FURTHER INVESTIGATION

PCB (FUSE INVESTIGATION)

Next: End

BURNER DOES NOT IGNITE

HARNESS - MAINS

Next: End

NOT IGNITING NO DROP

MEMBRANE

Next: End

NOT IGNITING NO DROP

FAN

Next: End

BURNER DOES NOT IGNITE2

PRIMARY HEAT EXCHANGER

Next: End

BURNER DOES NOT IGNITE 2

GAS VALVE

Next: End

VOLTAGE GAS VALVE 1

PCB

Next: End

DOES NOT IGNITE - HIGH RESIST

LIMITER - TEMPERATURE (CORROSION)

Next: End

BURNER DOES NOT IGNITE NO DROP OVERHEAT

HARNESS - MAINS

Next: End

APS/FLUE/OH

HARNESS - MAINS

Next: End

DOES NOT IGNITE - OPEN CIRCUIT

LIMITER - TEMPERATURE (CORROSION)

Next: End

OVERHEAT INVESTIGATION

LIMITER - TEMPERATURE (CORROSION)

Next: End

APS/FLUE/OH OVERHEAT 1

HARNESS - MAINS

Next: End

BURNER IGNITION OVERHEAT 1

LIMITER - TEMPERATURE

Next: End

DHW COOL RADIATORS COOL

HEAT EXCHANGER - PLATE

Next: End

DHW COOL RADS COOL PRESSURE OK

HARNESS - MAINS

Next: End

DHW TOO COOL 2

PCB

Next: End

PUMP DOES NOT RUN DT20

HARNESS - MAINS

Next: End

PREHEAT DT20

PCB

Next: End

PUMP DOES NOT RUN 2 DT20

HARNESS - MAINS

Next: End

PREHEAT DT20

PUMP

Next: End

PUMP DOES NOT RUN

HARNESS - MAINS

Next: End

PREHEAT

PCB

Next: End

PUMP DOES NOT RUN 2

HARNESS - MAINS

Next: End

PREHEAT

PUMP

Next: End

BURNER DOES NOT IGNITE

MEMBRANE

Next: End

BURNER DOES NOT IGNITE

FAN

Next: End

BURNER DOES NOT EST

PRIMARY HEAT EXCHANGER

Next: End

PRIMARY PRE TEST FAN PRESSURE

PRIMARY HEAT EXCHANGER

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

PRIMARY HEAT EXCHANGER

Next: End

DOES NOT REACT TO DH DEMAND CH DEMAND 1

TIMER

Next: End

FAN DOES NOT RUNFAULT CODE

HARNESS - MAINS

Next: End

FAN DOES NOT RUN 1FAULT CODE

PCB

Next: End

VOLATILE LOCKOUTFAULT CODE

HARNESS - MAINS

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT NO DROP

MEMBRANE

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT NO DROP

FAN

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT 2

PRIMARY HEAT EXCHANGER

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

GAS VALVE SETTING RETEST

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

GAS VALVE SETTING

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

NO FAULT INTERMITTENT IGNITION

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT WITH DROP

MEMBRANE

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT DROP

FAN

Next: End

FAN DOES NOT RUN - NEW STYLE FAN

PCB

Next: End

DOES NOT RUN - NEW STYLE

FAN

Next: End

FAN RUNS - NEW STYLE

FAN

Next: End

FAN DOES NOT RUN

PCB

Next: End

DOES NOT RUN

FAN PCB

Next: End

FAN RUNS

FAN PCB

Next: End

FAN REDUCES AND STOPS - NEW STYLE

PCB

Next: End

SLOW THEN TO HIGH SPEED - NEW STYLE

FAN

Next: End

BELOW 124 VAC - NEW STYLE

FAN

Next: End

FAN REDUCES AND STOPS

PCB

Next: End

SLOW THEN TO HIGH SPEED

FAN PCB

Next: End

BELOW 124 VAC

FAN PCB

Next: End

FUSE INVESTIGATION

FAN PCB

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE FAN

PCB

Next: End

VOLATILE LOCKOUT FAN RUNS 1- NEW STYLE

FAN

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE

FAN

Next: End

FAN DOES NOT RUN1 FAULT CODE

PCB

Next: End

FAN RUNS1 FAULT CODE

FAN PCB

Next: End

VOLATILE LOCKOUT FAN REDUCES AND STOPS - NEW STYLE

PCB

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED - NEW STYLE

FAN

Next: End

VOLATILE LOCKOUT BELOW 124 VAC - NEW STYLE

FAN

Next: End

VOLATILE LOCKOUT FAN REDUCES AND STOPS

PCB

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED

FAN PCB

Next: End

VOLATILE LOCKOUT BELOW 124 VAC

FAN PCB

Next: End

DOES NOT RUN1 FAULT CODE

FAN PCB

Next: End

DHW HOT THEN COLD

PCB

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER - PLATE

Next: End

EXCESSIVE SYSTEM PRESSURE

HOSE - FLEXIBLE

Next: End

RADS DO NOT HEAT

Next: End

GAS VALVE OVERHEAT 1

PCB

Next: End

DHW COOL, RADIATORS HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p101

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1810

BOILER NOISY

CHARACTERISTIC TEST FROM CH OPERATION

Next: p779

FAN RUNS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p2775

BOILER REACHES TEMPERATURE, RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p796

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p2466

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p2469

TEMPERATURE DIFFERENTIAL INCORRECT LOCAL NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1871

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1873

BOILER FIRES FOR DHW THEN SHUTS DOWN WITH PUMP PULSING ON/OFF

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2090

FLOW SENSOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2602

INLET FILTER BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2604

FLOW REGULATOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2606

NOZZLES BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2608

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p2752

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p2625

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2770

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2772

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2843

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2845

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2860

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2862

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2938

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2940

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p2951

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p2954

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p2973

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p2968

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p2975

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p2978

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3060

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3062

VOLATILE LOCKOUT DISPLAYED WITHIN 10 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3151

VOLATILE LOCKOUT DISPLAYED AFTER MORE THAN 20 SECONDS, FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3304

BURNER IGNITES SMOOTHLY BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p319

BURNER DOES NOT IGNITE SMOOTHLY / INTERMITTENT IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p3188

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3200

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3202

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3210

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3212

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1632

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3234

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3236

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3242

240 VOLTS PRESENT BETWEEN PURPLE/BROWN BUT OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3370

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3254

240 VOLTS PRESENT BETWEEN PURPLE/BROWN BUT OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3374

VOLTAGE ABOVE 120 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB) - NEW STYLE

Next: p3272

VOLTAGE BETWEEN 110 VAC AND 120 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB) - NEW STYLE

Next: p3274

VOLTAGE ABOVE 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3284

VOLTAGE BETWEEN 124 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3286

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3309

240 VOLTS PRESENT BETWEEN PURPLE/BROWN BUT OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3380

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3321

240 VOLTS PRESENT BETWEEN PURPLE/BROWN BUT OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3384

VOLTAGE ABOVE 120 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB) - NEW STYLE

Next: p3342

VOLTAGE BETWEEN 110 VAC AND 120 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB) - NEW STYLE

Next: p3344

VOLTAGE ABOVE 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3354

VOLTAGE BETWEEN 124 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3356

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p761

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM CH OPERATION

Next: p716

HEAT EXCHANGER NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p720

DHW TOO COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p733

BURNER IGNITES BUT BAFFLES OR IS NOISY

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p987

23/02/2022 14:32:38 2202_1_50_1 01/06/2022 12:33:45

03/05/2022 14:02:09

Next: End

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p1054, f1055

RESISTANCE FUSE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1056, f1057

FUSE FURTHER INVESTIGATION

Next: !p1058, !f1059

FUSE F1

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1635, f1636

FUSE FURTHER INVESTIGATION F1

Next: !p1637, !f1638

FUSE FURTHER INVESTIGATION F3

Next: !p1641, !f1642

FUSE FURTHER INVESTIGATION F2

Next: !p1645, !f1646

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1813, !f1814

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: p2478, f3089

VOLTS TO TURBINE

Next: p2759, f1891

HARNESS CONTINUITY (TURBINE)

BREAK THE INLINE CON

Next: !p1892, !f1893

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p1896, !f2330

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1900, !f1901

RESISTANCE FLOW SWITCH DHW

SEPARATE DHW FLOW SENSOR HARNESS (INLINE CONNECTOR)

Next: p2352, !f2163

PUMP VOLTAGE

{GAINPCBACS}

Next: p2201, !f2202

INTERNAL OR EXTERNAL CONTROLS

Next: p2302, f2303

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p2640, f2305

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2306, !f2307

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2312, !f2313

INTERNAL FAULT RESET

Next: !p2336, !f2337

RESISTANCE GAS VALVE

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p2355, !f2356

RESISTANCE PUMP

DISCONNECT THE PUMP CONNECTOR
ENSURE PUMP SPEED SELECTOR IS SET TO POSITION 3

Next: !p2359, !f2360

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p2363, f3299

OBSERVATION COLD MAINS FLOW RATE

Next: p2998, !f2598

VOLTAGE DIVERTER VALVE AT PCB

NO DEMAND
PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p2698, !f2647

VOLTAGE DIVERTER VALVE AT PCB

NO DEMAND
PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p2703, !f2652

INSPECTION SEAL INTEGRITY

Next: !p2657, !f2658

INSPECTION HARNESS ELECTRODE SENSE

DISCONNECT THE CONNECTOR FROM THE FLAME SENSE
ELECTRODE AT THE TOP OF THE APPLIANCE

Next: !p2709, !f2710

INSPECTION FLUE

Next: p2763, !f2764

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p2778, ?2959, ?2961

CONDENSATE PIPE

Next: p3071, !f2854

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p2895, !f2896

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2899, !f2900

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p2923, ?2950, ?2952

RESISTANCE GAS VALVE

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p2927, !f2928

INSPECTION FLUE

Next: p2931, !f2932

RESISTANCE GAS VALVE

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: p2946, !f2947

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p2983, !f2984

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p2990, !f2991

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p2994, !f2995

OBSERVATION DT20 OR DT20RF FITTED

Next: p3018, f3019

OBSERVATION DISCONNECT DT20 PUMP RUNS?

REMOVE THE PROGRAMMER FROM THE FACIA OF THE APPLIANCE
REMOVE THE CONNECTOR FROM THE PCB

Next: p3020, !f3021

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3024, f3025

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3026, !f3027

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3030, !f3031

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3036, f3037

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3038, !f3039

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3042, !f3043

INSPECTION FLUE

Next: p3057, !f3067

INSPECTION FLUE

Next: p3090, !f3097

OBSERVATION BLUE LED - FAULT CODE

PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)

Next: p3337, ?3150, ?3152

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3169, !f3170

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3173, !f3174

CONDENSATE PIPE

Next: p3191, !f3192

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3240, ?3241, ?3243

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3270, ?3271, ?3273

OBSERVATION FAN TYPE

Next: p3300, !f3301

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3307, ?3308, ?3310

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3340, ?3341, ?3343

BOILER RESET - OVERHEAT

ENSURE BOILER HAS COOLED

Next: p923, f912

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: !p913, ?2974, ?2976

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p106, f2645

FAN RUNS DHW DEMAND

Next: p1060, !f1139

FURTHER INVESTIGATION LED PROBLEM

Next: !p1072, !f1073

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p822, !f812

VOLTAGE AT PCB

{GAINPCBACS}

Next: p1633, f1634

INSPECTION CODE PLUG

LOWER THE FACIA PANEL

Next: p1887, !f2639

FUSE F3

REMOVE CONTROL BOX C

Next: p1639, f1640

FUSE F2

REMOVE CONTROL BOX C

Next: p1643, f1644

TRANSFORMER RESISTANCE

REMOVE THE BACK PLATE OF THE CONTROL BOX AND THE TRANSFORMER FROM THE PCB

Next: !p1647, !f1648

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p1811, f1812

DIFFERENTIAL FLOW RETURN

TEMPERATURE CONTROL SET TO MAX
ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES

Next: !p1869, ?1870, ?1872

VOLTS FROM TURBINE

TURN HOT WATER TAP ON AND SET FLOW RATE TO APPROX. 3 LITRES PER MINUTE

Next: p1888, f1889

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p1894, f1895

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: p3237, f1899

PUMP LIMPET TEST

Next: p703, !f2036

INSPECTION PRESSURE SYSTEM

Next: p2091, !f2092

PUMP LIMPET TEST

Next: p2093, !f2094

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: p2095, !f2298

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: p2113, !f2114

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p2115, !f2116

INSPECTION GAS SUPPLY TUBE

Next: p992, !f2134

PUMP RUNNING

Next: p924, f2200

PUMP HARNESS CONTINUITY

REMOVE THE ELECTRICAL CONNECTOR FROM THE PUMP AND
THE PUMP CONNECTOR ST4 FROM THE PCB

Next: !p2203, !f2204

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p2310, f2311

RESISTANCE SIT GAS VALVE AND HARNESS - FURTHER INVESTIGATION

REMOVE ST9 CONNECTOR

Next: p2353, f2354

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR ST4 FROM THE PCB
ENSURE PUMP SPEED SELECTOR IS SET TO POSITION 3

Next: p2357, f2358

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR ST5 FROM THE PCB

Next: p2361, f2362

RESISTANCE TRANSFORMER

REMOVE THE BACK PLATE OF THE CONTROL BOX AND THE TRANSFORMER FROM THE PCB

Next: p2901, !f2366

INSPECTION GAS SUPPLY TUBE

Next: !p2467, !f2468

INSPECTION GAS SUPPLY TUBE

Next: !p2470, !f2471

INSPECTION GAS SUPPLY TUBE

Next: !p2479, !f2480

CHECK FLOW COMPONENTS

ISOLATE AND DRAIN TH

Next: !p2599, ?2601, ?2603, ?2605, ?2607

CONDENSATE PIPE

Next: p2711, !f2611

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2612, f3046

RECTIFICATION VOLTAGE

{GAINPCBACS}

Next: !p2620, ?2622, ?2624

RESISTANCE HARNESS ELECTRODE SENSE TO EARTH

DISCONNECT CONNECTER

Next: !p2626, f2708

INTERNAL CLOCK

ANY EXTERNAL CH CONT

Next: !p3102, !f2642

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p2699, !f2700

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p2701, !f2702

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p2704, !f2705

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p2706, !f2707

INSPECTION GAS SUPPLY TUBE

Next: p2610, !f2741

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p2753, !f2754

ELECTRODE SENSE

REMOVE THE ELECTRODE ASSEMBLY

Next: p2755, !f2756

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2757, !f2758

OBSERVATION ISOLATE DHW

Next: !p2760, !f2761

INSPECTION GAS SUPPLY TUBE

Next: p2765, !f2766

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2767, ?2769, ?2771

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2773, !f2774

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p2776, f2777

CONDENSATE PIPE

Next: p2798, !f2799

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p3267, !f2785

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2800, !f2801

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2802, f2912

ELECTRODE SPARK HARNESS

REMOVE THE IGNITION HARNESS CONNECTION FROM THE
ELECTRODES TOP OF THE BURNER AND FROM THE PCB

Next: p2836, !f2837

INSPECTION GAS SUPPLY TUBE

Next: p2838, !f2839

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2840, ?2842, ?2844

INSPECTION SPARK ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: p2846, !f2847

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p2848, !f2849

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p2850, !f2851

INSPECTION GAS SUPPLY TUBE

Next: p2855, !f2856

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2857, ?2859, ?2861

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3088, !f2864

TEMPERATURE DHW AT BOILER

Next: p2868, !f2869

PUMP LIMPET TEST

Next: p2987, !f2871

PRIMARY SENSOR (HIGH FLAME)

DISCONNECT PLUG (RE

Next: p2889, !f2890

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p2891, !f2892

FLOW PIPE DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p2893, f2894

RUN BOILER TO MAX TEMP-DOES OVERHEAT OCCUR

ATTACH TEMPERATURE CLAMP TO FLOW PIPE
SET BOILER TEMPERATURE CONTROL TO MAX

Next: !p2897, f2898

RESISTANCE MECHANICAL TIMER (MT 10)

Next: !p2902, !f2903

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
REMOVE THE GAS VALVE CONNECTORS FROM THE GAS VALVE AND MAKE SAFE

Next: p2924, f2945

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT ST9 CONNE

Next: p2925, f2926

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2929, f2930

INSPECTION GAS SUPPLY TUBE

Next: !p2943, !f2944

INSPECTION GAS SUPPLY TUBE

Next: p2933, !f2934

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2935, ?2937, ?2939

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2941, !f2942

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p2948, !f2949

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p2955, !f2956

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2957, !f2958

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p2969, !f2970

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2971, !f2972

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p2979, !f2980

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2981, f2982

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p2985, !f2986

FLOW PIPE DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p2988, f2989

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: p2992, f2993

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p2996, !f2997

INSPECTION DHW ISOLATION VALVE

Next: p2597, !f3009

INSPECTION DIVERTER VALVE PADDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p805, !f3016

VOLTS TO PUMP (PREHEAT)

{GAINPCBACS}
ENSURE PRIMARY HEAT EXCHANGER IS BELOW 40°C (TO ENSURE A DEMAND FOR PREHEAT)

Next: p3034, f3035

VOLTS TO PUMP (PREHEAT)

{GAINPCBACS}
ENSURE PRIMARY HEAT EXCHANGER IS BELOW 40°C (TO ENSURE A DEMAND FOR PREHEAT)

Next: p3022, f3023

PUMP HARNESS CONTINUITY

REMOVE THE ELECTRICAL CONNECTOR FROM THE PUMP AND
THE PUMP CONNECTOR ST4 FROM THE PCB

Next: !p3032, !f3033

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3028, f3029

PUMP HARNESS CONTINUITY

REMOVE THE ELECTRICAL CONNECTOR FROM THE PUMP AND
THE PUMP CONNECTOR ST4 FROM THE PCB

Next: !p3044, !f3045

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3040, f3041

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3058, ?3059, ?3061

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3070, !f3064

INSPECTION FLUE

Next: p2853, !f3086

INSPECTION GAS SUPPLY TUBE

Next: p3091, !f3092

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3100, !f3094

INSPECTION CODE PLUG

LOWER THE FACIA PANEL

Next: p3165, !f3166

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3167, f3168

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3171, f3172

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: p3189, f3190

INLET PRESSURE MAX OUTPUT

ATTACH PRESSURE GAU

Next: p3205, !f3206

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2609, !f393

INSPECTION FLUE

Next: p3193, !f3194

INSPECTION GAS SUPPLY TUBE

Next: p3195, !f3196

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3197, ?3199, ?3201

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3203, !f3204

COMBUSTION ANALYSIS MAX AND MIN

UNCLIP DIVERTER VALVE HEAD FROM THE BODY AND LEAVE IN A SAFE POSITION

Next: p3207, ?3209, ?3211

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p3217, !f3218

INSPECTION GAS SUPPLY TUBE

Next: !p3215, !f3216

INSPECTION GAS SUPPLY TUBE

Next: !p3213, !f3214

CONDENSATE PIPE

Next: p3219, !f3220

INSPECTION FLUE OH STAT

Next: p3221, !f3222

INSPECTION GAS SUPPLY TUBE

Next: p3223, !f3224

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p3225, !f3226

ELECTRODE SPARK HARNESS

REMOVE THE IGNITION HARNESS CONNECTION FROM THE
ELECTRODES TOP OF THE BURNER AND FROM THE PCB

Next: p3227, !f3228

INSPECTION ELECTRODES

REMOVE THE ELECTRODE ASSEMBLY

Next: p3229, !f3230

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: !p3231, ?3233, ?3235

OBSERVATION FAN TYPE

Next: p3238, f3239

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3251, ?3253, ?3255

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3247, !f3248

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3245, !f3246

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3249, !f3250

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3261, !f3262

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3257, !f3258

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3259, !f3260

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3263, !f3264

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3265, !f3266

OBSERVATION FAN TYPE

Next: p3268, f3269

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3281, ?3283, ?3285

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3279, !f3280

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3277, !f3278

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3275, !f3276

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3293, !f3294

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3289, !f3290

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3287, !f3288

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3291, !f3292

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3295, !f3296

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3302, !f3303

OBSERVATION FAN TYPE

Next: p3305, f3306

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3318, ?3320, ?3322

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3314, !f3315

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3312, !f3313

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3316, !f3317

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3330, !f3331

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3367, !f3325

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3332, !f3333

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3334, !f3335

OBSERVATION FAN TYPE

Next: p3338, f3339

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3351, ?3353, ?3355

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3349, !f3350

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3347, !f3348

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3345, !f3346

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3363, !f3364

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3359, !f3360

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3357, !f3358

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3361, !f3362

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3365, !f3366

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3368, !f3369

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3244, !f3391

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3256, !f3390

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3311, !f3393

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3323, !f3392

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p678, !f674

FLOW PIPE DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: !p675, !f677

PRIMARY SENSOR (HIGH FLAME)

DISCONNECT PLUG (RE

Next: p673, !f682

PUMP LIMPET TEST

Next: p672, !f697

CH OPERATION

CH TEMPERATURE CONTROL SET TO MAX

Next: !p704, !f2300

INSPECTION VESSEL PRESSURE

CLOSE FLOW AND RETURN ISOLATION VALVES
DISCHARGE PRIMARY SYSTEM WATER

Next: !p718, !f719

INSPECTION PRESSURE SYSTEM

Next: p2009, !f760

INSPECTION PRESSURE SYSTEM

Next: p2867, !f759

INSPECTION PRESSURE SYSTEM

Next: p683, !f771

PUMP LIMPET TEST

Next: p775, !f776

PRIMARY SENSOR (HIGH FLAME)

DISCONNECT PLUG (RE

Next: p1868, !f778

INSPECTION PRESSURE SYSTEM

Next: p774, !f785

INSPECTION PRESSURE SYSTEM

Next: p152, !f804

PUMP LIMPET TEST

Next: p815, !f811

BYPASS (INTERNAL)

ENSURE RADS ARE OPEN AND WATER CAN CIRCULATE AROUND THE SYSTEM
USE AN FGA TEMPERATURE PROBE

Next: !p834, !f934

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: p3010, f2650

INSPECTION PRESSURE SYSTEM

Next: p2185, !f925

PUMP LIMPET TEST

Next: p2888, !f926

CONDENSATE PIPE

Next: p989, !f988

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p990, !f991

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2130, f2762

INSPECTION FLUE

Next: !p1020, !f1011

System Information

Total Tests: 656

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control