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 (HAS ON/OFF SWITCH, NO A.P.S.)

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

WORCESTER GREENSTAR JUNIOR

CASE REMOVAL<

Next: &2606, !f2

DHW FLOW RATE

Next: &3364, f2504

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, ?3150

ENHANCED FAULT CODES

SELECT APPROPRIATE FAULT CODE

Next: &1052, !f467

TYPE OF DIAGNOSTIC PROCEDURE

Next: &2286, !f471

MAXIMUM OUTPUT MODE

INSTRUCTIONS TO S

Next: &nff, !f701

POWER UP

ON/OFF SWITCH ON

Next: &5, f1053

FURTHER INVESTIGATION FUSE BLOWN

NOT USED

Next: &nff, f3477

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: &1833, f2772

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

COMBUSTION ANALYSIS MAX AND MIN CH OP SEQUENCE

NO LONGER USED

Next: &nff, ?1875, ?1877

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

VOLATILE LOCK OUT

NOT USED

Next: &nff, f3111

BURNER SEAL CHECK FOR OVERHEAT

OUTSIDE MODEL

Next: &nff, f2564

INFORMATION PREHEAT

1. THIS APPLI

Next: &470, !f2607

INFORMATION FAN PCB REMOVAL

Next: &nff, !f3334

INFORMATION FAN DEMAND VOLTAGE

THE PWM OR (DEMAND/S

Next: &nff, !f3363

PUMP RUNS PREHEAT

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

Next: &317, f3365

FURTHER INVESTIGATION OVERHEAT

NOT USED

Next: &nff, f3427

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f3564

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f3566

HEADER FOR QADAI DHW SENSOR

OK TO BE BLANK

Next: &nff, f3568

HEADER FOR QADAI SENSOR TEMP FLOW

OK TO BE BLANK

Next: &nff, f3572

HEADER FOR QADAI GAS VALVE RESISTANCE - SIT

OK TO BE BLANK

Next: &nff, f3576

HEADER FOR QADAI GAS VALVE VOLTAGE

OK TO BE BLANK

Next: &nff, f3580

HEADER FOR QADAI FAN RESISTANCE

OK TO BE BLANK

Next: &nff, f3584

HEADER FOR QADAI PUMP RESISTANCE (STANDARD)

OK TO BE BLANK

Next: &nff, f3588

HEADER FOR QADAI PUMP RESISTANCE (ERP)

OK TO BE BLANK

Next: &nff, f3592

HEADER FOR QADAI PUMP VOLTAGE

OK TO BE BLANK

Next: &nff, f3596

HEADER FOR QADAI FLOW TURBINE

OK TO BE BLANK

Next: &nff, f3600

HEADER FOR QADAI DIVERTER VALVE RESISTANCE

OK TO BE BLANK

Next: &nff, f3604

HEADER FOR QADAI TRANSFORMER

OK TO BE BLANK

Next: &nff, f3614

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 HEAD 3 SPEED (PUMP - ERP)

Next: End

DHW COOL

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

PUMP PULSES

SYSTEM PRESSURE

Next: End

PULSES ON OFF

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

PUMP PULSES 2

SENSOR - CONTROL

Next: End

PUMP PULSES 2

SENSOR - TEMPERATURE - DHW

Next: End

BAFFLES OUT

TUBE GAS SUPPLY

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

COMBUSTION INCORRECT

TUBE GAS SUPPLY

Next: End

DROPS OUT MIN MODE

TUBE GAS SUPPLY

Next: End

CH COMBUSTION INCORRECT

TUBE GAS SUPPLY

Next: End

CH DROPS OUT MIN MODE

TUBE GAS SUPPLY

Next: End

CH PERFORMANCE FAIL 2

TUBE GAS SUPPLY

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

INFORMATION PREHEAT

Z DIRECTION

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

TUBE GAS SUPPLY

Next: End

DOES NOT ESTABLISH - FLAME SENSE SHORTING TO EARTH

HARNESS - MAINS

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

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

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 MODE

DIVERTER VALVE ASSEMBLY

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

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

INFORMATION FAN PCB REMOVAL

Z DIRECTION

Next: End

DOES NOT RUN1 FAULT CODE

FAN

Next: End

240V ON ALL FAN CONNECTIONS 4

PCB

Next: End

240V ON ALL FAN CONNECTIONS 3

PCB

Next: End

240V ON ALL FAN CONNECTIONS 2

PCB

Next: End

240V ON ALL FAN CONNECTIONS

PCB

Next: End

BLANK FOR FAN DEMAND INFORMATION

Z DIRECTION

Next: End

PREVENTING PREHEAT

DT20 / DT20RF

Next: End

PUMP DOES NOT RUN 1

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN 1

SENSOR - TEMPERATURE - DHW

Next: End

PUMP NOT RUNNING

CABLE - PUMP

Next: End

PUMP DOES NOT RUN ERP 1

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN ERP 1

SENSOR - TEMPERATURE - DHW

Next: End

PUMP DOES NOT RUN

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN

SENSOR - TEMPERATURE - DHW

Next: End

PUMP DOES NOT RUN PREHEAT

CABLE - PUMP

Next: End

PUMP DOES NOT RUN ERP

SENSOR - CONTROL

Next: End

PUMP DOES NOT RUN ERP

SENSOR - TEMPERATURE - DHW

Next: End

FAN RUNS OVERHEAT 1

LIMITER 120°C - TEMPERATURE

Next: End

FLUE OVERHEAT

BURNER

Next: End

FLUE OVERHEAT

PRIMARY HEAT EXCHANGER

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

PUMP - DHW COOL RADS COOLPUMP RUNNING PRE TEST 2

PCB

Next: End

DHW COOL RADS COOLPUMP RUNNING PRE TEST 2

CABLE - PUMP

Next: End

OVERHEAT ERP PUMP FITTED

PCB

Next: End

OVERHEAT

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

OVERHEAT

SENSOR - CONTROL

Next: End

OVERHEAT

SENSOR - TEMPERATURE - DHW

Next: End

OVERHEAT

HEAT EXCHANGER ASSEMBLY

Next: End

FUSE FURTHER INVESTIGATION

FLOW SENSOR ASSEMBLY

Next: End

FURTHER INVESTIGATION

GAS VALVE

Next: End

FUSE INVESTIGATION - INCOMPATIBLE

FAN

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

FURTHER INVESTIGATION FURTHER INVESTIGATION

TRANSFORMER

Next: End

FUSE INVESTIGATION

TIMER - MECHANICAL - MT10

Next: End

FUSE FURTHER INVESTIGATION

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

LITE DIAGNOSTIC

Z DIRECTION

Next: End

QADAI

Z DIRECTION

Next: End

QADAI

SENSOR - TEMPERATURE - DHW

Next: End

QADAI

SENSOR - CONTROL

Next: End

QADAI SIT

GAS VALVE

Next: End

QADAI GAS VALVE VOLTAGE

PCB

Next: End

QADAI FAN RESISTANCE

FAN

Next: End

QADAI RESISTANCE PUMP

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

QADAI RESISTANCE

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

QADAI PUMP VOLTAGE

PCB

Next: End

QADAI

FLOW SENSOR ASSEMBLY

Next: End

QADAI

MOTOR - DIVERTER VALVE

Next: End

OVERHEAT

LIMITER 120°C - TEMPERATURE

Next: End

QADAI

TRANSFORMER

Next: End

FUSE BLOWN ERP PUMP

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

FUSE BLOWN

CABLE TO CONVERT TO UPMO PUMP (ERP PUMP HARNESS)

Next: End

FUSE FURTHER INVESTIGATION ERP PUMP

FLOW SENSOR ASSEMBLY

Next: End

FURTHER INVESTIGATION ERP PUMP

GAS VALVE

Next: End

FUSE INVESTIGATION - INCOMPATIBLE ERP PUMP

FAN

Next: End

FURTHER INVESTIGATION FUSE F1 ERP PUMP

FAN

Next: End

FURTHER INVESTIGATION FURTHER INVESTIGATION ERP PUMP

TRANSFORMER

Next: End

FUSE INVESTIGATION ERP PUMP

TIMER - MECHANICAL - MT10

Next: End

PUMP DOES NOT RUN PREHEAT

CABLE TO CONVERT TO UPMO PUMP (ERP PUMP HARNESS)

Next: End

ERP PUMP NOT RUNNING 1

CABLE - PUMP

Next: End

OVERHEAT ERP PUMP FITTED

CABLE TO CONVERT TO UPMO PUMP (ERP PUMP HARNESS)

Next: End

ERP PUMP OVERHEAT

CABLE - PUMP

Next: End

PUMP DOES NOT RUN PREHEAT 1

CABLE TO CONVERT TO UPMO PUMP (ERP PUMP HARNESS)

Next: End

ERP PUMP NOT RUNNING

CABLE - PUMP

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 HEAD 3 SPEED (PUMP - ERP)

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 HEAD 3 SPEED (PUMP - ERP)

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 HEAD 3 SPEED (PUMP - ERP)

Next: End

RADS DO NOT HEAT

ISOLATION VALVES

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

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

CO2 SETTINGS INCORRECT

GAS VALVE SETTING RETEST

Next: End

DROPS OUT ON MINIMUM

GAS VALVE SETTING

Next: End

PT FROM CH SEQUENCECO2 SETTINGS INCORRECT

GAS VALVE SETTING RETEST

Next: End

PT FROM CH SEQUENCEDROPS 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

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

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB

Next: End

FLAME SENSE

PCB

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

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

DOES NOT IGNITE - OPEN CIRCUIT

LIMITER - TEMPERATURE (CORROSION)

Next: End

APS/FLUE/OH

HARNESS - MAINS

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

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

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

PUMP DOES NOT RUN 3

HARNESS - MAINS

Next: End

PUMP DOES NOT RUN

PCB

Next: End

PUMP DOES NOT RUN 4

HARNESS - MAINS

Next: End

NOT RUNNING PREHEAT

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

PUMP DOES NOT RUN 5

HARNESS - MAINS

Next: End

PUMP DOES NOT RUN ERP

PCB

Next: End

PUMP DOES NOT RUN ERP 1

HARNESS - MAINS

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 HEAD 3 SPEED (PUMP - ERP)

Next: End

PUMP DOES NOT RUN ERP

HARNESS - MAINS

Next: End

PREHEAT ERP

PCB

Next: End

PUMP DOES NOT RUN 2 ERP

HARNESS - MAINS

Next: End

GAS VALVE OVERHEAT 1

PCB

Next: End

OVERHEAT INVESTIGATION

LIMITER - TEMPERATURE (CORROSION)

Next: End

BURNER IGNITION OVERHEAT 1

LIMITER - TEMPERATURE

Next: End

DHW COOL RADIATORS COOLPUMP RUNNING PRE TEST 2

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

OVERHEAT

HEAT EXCHANGER - PLATE

Next: End

OVERHEAT

PCB

Next: End

GAS VALVE BURNER IGNITES 1FURTHER INVESTIGATION

HARNESS - MAINS

Next: End

FURTHER INVESTIGATION FUSE F1 FURTHER INVESTIGATION

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FUSE INVESTIGATION

FAN PCB

Next: End

FURTHER INVESTIGATION

PCB (FUSE INVESTIGATION)

Next: End

FUSE FURTHER INVESTIAGTION

CABLE - PUMP

Next: End

DHW SENSOR

RESULT AS EXPECTED

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

SIT GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED

Next: End

FAN RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE ERP

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE

RESULT AS EXPECTED

Next: End

FLOW SENSOR TURBINE

RESULT AS EXPECTED

Next: End

DIVERTER VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

APS/FLUE/OH OVERHEAT 1

HARNESS - MAINS

Next: End

OVERHEAT 2

LIMITER - TEMPERATURE

Next: End

TRANSFORMER

RESULT AS EXPECTED

Next: End

FUSE BLOWN

CABLE - PUMP

Next: End

GAS VALVE BURNER IGNITES 1FURTHER INVESTIGATION ERP PUMP

HARNESS - MAINS

Next: End

FURTHER INVESTIGATION FUSE F1 FURTHER INVESTIGATION ERP PUMP

CABLE FAN CONNECTOR ASSEMBLY

Next: End

FUSE INVESTIGATION ERP PUMP

FAN PCB

Next: End

FURTHER INVESTIGATION ERP PUMP

PCB (FUSE INVESTIGATION)

Next: End

PUMP DOES NOT RUN PREHEAT ERP

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

OVERHEAT ERP PUMP FITTED

PUMP HEAD 3 SPEED (PUMP - ERP)

Next: End

PUMP DOES NOT RUN PREHEAT ERP 1

PUMP HEAD 3 SPEED (PUMP - ERP)

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

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: p2670

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

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p2472

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p2475

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: !p2510

INLET FILTER BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2512

FLOW REGULATOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2514

NOZZLES BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p2516

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP OR FLUCTUATES

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p2637

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p2639

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2665

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2667

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2749

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2751

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2780

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2782

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2900

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p2902

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p2913

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p2916

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p2922

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p2925

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3016

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3018

VOLATILE LOCKOUT DISPLAYED WITHIN 10 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3114

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

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3270

BURNER DOES NOT IGNITE SMOOTHLY / INTERMITTENT IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p3151

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3163

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3165

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3173

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3175

BURNER IGNITES SMOOTHLY BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p319

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3197

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3199

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3205

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3338

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3217

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3342

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1632

VOLTAGE ABOVE 120 VAC

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

Next: p3235

VOLTAGE BETWEEN 110 VAC AND 120 VAC

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

Next: p3237

VOLTAGE ABOVE 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3247

VOLTAGE BETWEEN 124 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3249

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3275

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3348

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3287

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3352

VOLTAGE ABOVE 120 VAC

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

Next: p3308

VOLTAGE BETWEEN 110 VAC AND 120 VAC

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

Next: p3310

VOLTAGE ABOVE 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3320

VOLTAGE BETWEEN 124 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3322

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p3432

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p3434

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

28/11/2024 13:46:34 2410_3_50_1 01/04/2025 15:23:06

27/01/2025 16:26:20

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, f3045

VOLTS TO TURBINE

Next: p2650, 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

INTERNAL OR EXTERNAL CONTROLS

Next: p2302, f2303

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p2548, f2305

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2306, !f2307

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2312, !f2313

INTERNAL FAULT RESET

Next: !p2336, !f2337

OBSERVATION COLD MAINS FLOW RATE

Next: p2954, !f2506

VOLTAGE DIVERTER VALVE AT PCB

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

Next: p2608, !f2555

VOLTAGE DIVERTER VALVE AT PCB

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

Next: p2613, !f2560

INSPECTION SEAL INTEGRITY

Next: !p2565, !f2566

INSPECTION HARNESS ELECTRODE SENSE

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

Next: !p2642, !f2643

INSPECTION FLUE

Next: p2658, !f2659

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p2673, ?2921, ?2923

CONDENSATE PIPE

Next: p3027, !f2774

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p2885, ?2912, ?2914

RESISTANCE - SIT GAS VALVE SOLENOIDS

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p2889, !f2890

INSPECTION FLUE

Next: p2893, !f2894

RESISTANCE - SIT GAS VALVE SOLENOIDS

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: p2908, !f2909

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p2946, !f2947

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p2950, !f2951

INSPECTION FLUE

Next: p3013, !f3023

INSPECTION FLUE

Next: p3053, !f3060

OBSERVATION BLUE LED - FAULT CODE

PREHEAT SWITCHED OFF (ECO BUTTON ILLUMINATED)

Next: p3303, ?3113, ?3115

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3132, !f3133

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3136, !f3137

CONDENSATE PIPE

Next: p3154, !f3155

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3203, ?3204, ?3206

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3233, ?3234, ?3236

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3273, ?3274, ?3276

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3306, ?3307, ?3309

OBSERVATION DT20 OR DT20RF FITTED

Next: p3366, f3367

OBSERVATION DISCONNECT DT20 PUMP RUNS?

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

Next: p3368, !f3369

VOLTS TO PUMP (PREHEAT)

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

Next: p3372, f3373

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3374, f3375

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3376, !f3377

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3380, !f3381

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3386, f3387

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3388, !f3389

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3392, !f3393

VOLTS TO PUMP (PREHEAT)

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

Next: p3400, f3401

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3402, f3403

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3404, !f3405

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3408, !f3409

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3414, f3415

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3416, !f3417

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3420, !f3421

BOILER RESET - OVERHEAT

ENSURE BOILER HAS COOLED

Next: p3428, f3429

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: !p3430, ?3431, ?3433

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p3439, !f3440

OBSERVATION PUMP TYPE

Next: p3449, f3450

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3451, !f3452

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p3469, !f3470

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p3611, !f3612

OBSERVATION PUMP TYPE

Next: p3501, f3521

RESISTANCE PUMP AND HARNESS

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

Next: p3522, f3541

RESISTANCE - SIT GAS VALVE SOLENOIDS

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p3527, !f3528

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p3531, f3532

OBSERVATION FAN TYPE

Next: p3533, !f3534

RESISTANCE PUMP

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

Next: !p3542, !f3543

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3569, !f3570

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3573, !f3574

RESISTANCE - SIT GAS VALVE SOLENOIDS

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p3577, !f3578

VOLTAGE GAS VALVE AT PCB

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

Next: !p3581, !f3582

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p3585, !f3586

RESISTANCE PUMP

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

Next: !p3589, !f3590

RESISTANCE PUMP - ERP

REMOVE THE CONNECTOR FROM THE PUMP

Next: !p3593, !f3594

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p3597, !f3598

VOLTS FROM TURBINE

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

Next: !p3601, !f3602

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR ST1

Next: !p3605, !f3606

RESISTANCE TRANSFORMER

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

Next: !p3615, !f3616

RESISTANCE PUMP - ERP

REMOVE THE CONNECTOR FROM THE PUMP

Next: p3638, !f3639

RESISTANCE - SIT GAS VALVE SOLENOIDS

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p3649, !f3650

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p3653, f3654

OBSERVATION FAN TYPE

Next: p3655, !f3656

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p106, f2553

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, !f2547

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 MAXIMUM
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: p3200, f1899

PUMP LIMPET TEST

Next: p703, !f2036

PUMP LIMPET TEST

Next: p2943, !f2050

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

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p2310, f2311

INSPECTION GAS SUPPLY TUBE

Next: !p2467, !f2468

INSPECTION GAS SUPPLY TUBE

Next: !p2470, !f2471

INSPECTION GAS SUPPLY TUBE

Next: !p2473, !f2474

INSPECTION GAS SUPPLY TUBE

Next: !p2476, !f2477

INSPECTION GAS SUPPLY TUBE

Next: !p2479, !f2480

CHECK FLOW COMPONENTS

ISOLATE AND DRAIN TH

Next: !p2507, ?2509, ?2511, ?2513, ?2515

CONDENSATE PIPE

Next: p2620, !f2519

INTERNAL CLOCK

ANY EXTERNAL CH CONT

Next: !p3065, !f2550

VOLTAGE DIVERTER MOTOR SUPPLY PCB

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

Next: p2609, !f2610

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p2611, !f2612

VOLTAGE DIVERTER MOTOR SUPPLY PCB

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

Next: p2614, !f2615

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p2616, !f2617

INSPECTION GAS SUPPLY TUBE

Next: p2621, !f2622

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2623, f3002

RECTIFICATION VOLTAGE

{GAINPCBACS}

Next: !p2634, ?2636, ?2638

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p2644, !f2645

RESISTANCE HARNESS ELECTRODE SENSE TO EARTH

DISCONNECT CONNECTER

Next: !p2640, f2641

ELECTRODE SENSE

REMOVE THE ELECTRODE ASSEMBLY

Next: p2646, !f2647

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2648, !f2649

OBSERVATION ISOLATE DHW

Next: !p2651, !f2652

INSPECTION GAS SUPPLY TUBE

Next: p2660, !f2661

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2662, ?2664, ?2666

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2668, !f2669

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p2671, f2672

CONDENSATE PIPE

Next: p2698, !f2699

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p3230, !f2682

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2700, !f2701

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2702, f2874

ELECTRODE SPARK HARNESS

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

Next: p2742, !f2743

INSPECTION GAS SUPPLY TUBE

Next: p2744, !f2745

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2746, ?2748, ?2750

INSPECTION SPARK ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: p2752, !f2753

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p2754, !f2755

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p2756, !f2757

INSPECTION GAS SUPPLY TUBE

Next: p2775, !f2776

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2777, ?2779, ?2781

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3044, !f2784

TEMPERATURE DHW AT BOILER

Next: p2048, !f2869

VOLTAGE GAS VALVE AT PCB

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

Next: p2886, f2907

RESISTANCE - SIT GAS VALVE AND HARNESS

REMOVE ST9 CONNECTOR

Next: p2887, f2888

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p2891, f2892

INSPECTION GAS SUPPLY TUBE

Next: !p2905, !f2906

INSPECTION GAS SUPPLY TUBE

Next: p2895, !f2896

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2897, ?2899, ?2901

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2903, !f2904

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p2910, !f2911

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p2917, !f2918

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2919, !f2920

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p2926, !f2927

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2928, !f2929

FLOW PIPE DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p2944, f2945

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: p2948, f2949

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p2952, !f2953

INSPECTION DHW ISOLATION VALVE

Next: p2505, !f2965

INSPECTION DIVERTER VALVE PADDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p805, !f2972

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3014, ?3015, ?3017

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3026, !f3020

INSPECTION FLUE

Next: p2773, !f3042

INSPECTION GAS SUPPLY TUBE

Next: p3054, !f3055

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3063, !f3057

INSPECTION CODE PLUG

LOWER THE FACIA PANEL

Next: p3128, !f3129

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3130, f3131

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3134, f3135

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: p3152, f3153

INLET PRESSURE MAX OUTPUT

ATTACH PRESSURE GAU

Next: p3168, !f3169

INSPECTION FLUE

Next: p3156, !f3157

INSPECTION GAS SUPPLY TUBE

Next: p3158, !f3159

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3160, ?3162, ?3164

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3166, !f3167

COMBUSTION ANALYSIS MAX AND MIN

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

Next: p3170, ?3172, ?3174

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p3180, !f3181

INSPECTION GAS SUPPLY TUBE

Next: !p3178, !f3179

INSPECTION GAS SUPPLY TUBE

Next: !p3176, !f3177

CONDENSATE PIPE

Next: p3182, !f3183

INSPECTION FLUE OH STAT

Next: p3184, !f3185

INSPECTION GAS SUPPLY TUBE

Next: p3186, !f3187

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p3188, !f3189

ELECTRODE SPARK HARNESS

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

Next: p3190, !f3191

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p2517, !f393

INSPECTION ELECTRODES

REMOVE THE ELECTRODE ASSEMBLY

Next: p3192, !f3193

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: !p3194, ?3196, ?3198

OBSERVATION FAN TYPE

Next: p3201, f3202

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3214, ?3216, ?3218

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3210, !f3211

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3208, !f3209

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3212, !f3213

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3224, !f3225

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3220, !f3221

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3222, !f3223

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3226, !f3227

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3228, !f3229

OBSERVATION FAN TYPE

Next: p3231, f3232

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3244, ?3246, ?3248

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3242, !f3243

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3240, !f3241

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3238, !f3239

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3256, !f3257

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3252, !f3253

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3250, !f3251

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3254, !f3255

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3258, !f3259

OBSERVATION FAN TYPE

Next: p3271, f3272

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3284, ?3286, ?3288

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3280, !f3281

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3278, !f3279

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3282, !f3283

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3296, !f3297

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3335, !f3291

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3298, !f3299

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3300, !f3301

OBSERVATION FAN TYPE

Next: p3304, f3305

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3317, ?3319, ?3321

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3315, !f3316

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3313, !f3314

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3311, !f3312

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3329, !f3330

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3325, !f3326

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3323, !f3324

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3327, !f3328

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3331, !f3332

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3336, !f3337

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3207, !f3358

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3219, !f3359

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3277, !f3360

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3289, !f3361

OBSERVATION PUMP TYPE

Next: p3398, f3399

OBSERVATION PUMP TYPE

Next: p3370, f3371

VOLTS TO PUMP (PREHEAT)

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

Next: p3622, f3385

RESISTANCE HARNESS PUMP

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

Next: !p3382, !f3383

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3378, f3379

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3390, f3391

VOLTS TO PUMP (PREHEAT)

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

Next: p3617, f3413

RESISTANCE HARNESS PUMP

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

Next: !p3410, !f3411

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3406, f3407

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3418, f3419

INSPECTION PRESSURE SYSTEM

Next: p3445, !f3446

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p3435, !f3436

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p3608, f3438

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p3441, !f3442

PUMP RUNNING

Next: p3447, f3448

PUMP LIMPET TEST

Next: p3461, !f3462

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3627, !f3456

RESISTANCE HARNESS PUMP

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

Next: !p3453, !f3454

PRIMARY SENSOR (HIGH FLAME)

DISCONNECT PLUG (RE

Next: p3463, !f3464

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p3465, !f3466

FLOW PIPE DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p3467, f3468

RUN BOILER TO MAX TEMP-DOES OVERHEAT OCCUR

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

Next: !p3471, f3472

RESISTANCE PUMP AND HARNESS - ERP

REMOVE THE PUMP CONNECTOR ST4 FROM THE PCB

Next: p3644, f3637

RESISTANCE FLOW SWITCH DHW

SEPARATE DHW FLOW SENSOR HARNESS (INLINE CONNECTOR)

Next: p3523, !f3524

RESISTANCE SIT GAS VALVE AND HARNESS - FURTHER INVESTIGATION

REMOVE ST9 CONNECTOR

Next: p3525, f3526

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR ST5 FROM THE PCB

Next: p3529, f3530

RESISTANCE TRANSFORMER

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

Next: p3537, !f3538

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3535, !f3536

RESISTANCE MECHANICAL TIMER (MT 10)

Next: !p3539, !f3540

RESISTANCE HARNESS PUMP - ERP

REMOVE PUMP CABLE FROM THE PUMP
DISCONNECT THE PUMP CABLE AT THE INLINE CONNECTOR

Next: p3618, !f3663

RESISTANCE HARNESS PUMP

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

Next: !p3664, !f3665

RESISTANCE HARNESS PUMP - ERP

REMOVE PUMP CABLE FROM THE PUMP
DISCONNECT THE PUMP CABLE AT THE INLINE CONNECTOR

Next: p3623, !f3669

RESISTANCE HARNESS PUMP

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

Next: !p3670, !f3671

RESISTANCE HARNESS PUMP - ERP

REMOVE PUMP CABLE FROM THE PUMP
DISCONNECT THE PUMP CABLE AT THE INLINE CONNECTOR

Next: p3628, !f3666

RESISTANCE HARNESS PUMP

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

Next: !p3667, !f3668

RESISTANCE HARNESS PUMP - ERP

REMOVE PUMP CABLE FROM THE PUMP
DISCONNECT THE PUMP CABLE AT THE INLINE CONNECTOR

Next: !p3640, !f3641

RESISTANCE FLOW SWITCH DHW

SEPARATE DHW FLOW SENSOR HARNESS (INLINE CONNECTOR)

Next: p3645, !f3646

RESISTANCE SIT GAS VALVE AND HARNESS - FURTHER INVESTIGATION

REMOVE ST9 CONNECTOR

Next: p3647, f3648

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR ST5 FROM THE PCB

Next: p3651, f3652

RESISTANCE TRANSFORMER

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

Next: p3659, !f3660

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3657, !f3658

RESISTANCE MECHANICAL TIMER (MT 10)

Next: !p3661, !f3662

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: p2787, !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: p2966, f2558

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, f2657

INSPECTION FLUE

Next: !p1020, !f1011

System Information

Total Tests: 779

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control