XSol Diagnostic System

FURTHER INVESTIGATION OVERHEAT

NOT USED

Next: &nff, f911

FURTHER INVESTIGATION FUSE BLOWN

NOT USED

Next: &nff, f1075

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: &1833, f3453

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: &2790, ?1836, ?1838

CH OPERATION PERFORMANCE TEST FAIL

OUTSIDE OF MODEL

Next: &nff, f1880

INFORMATION CASE REMOVAL

CASE REMOVAL<

Next: &3041, !f1956

POWER UP SELF TEST

NO DEMANDS

Next: &1990, ?1958, ?1960

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &1992, !f1991

OPERATIONAL SEQUENCE

NO LONGER USED

Next: &5, !f1993

FAN RUNS

SET FLOW RATE TO APPROX. 3 LITRES PER MINUTE

Next: &317, f2895

VOLATILE LOCK OUT

NOT USED

Next: &nff, f3754

CH DEMAND

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

Next: &95, f2797

INTERNAL FAULT

NOT USED

Next: &nff, f2828

PUMP RUNS PREHEAT

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

Next: &2362, f3634

PRE-HEAT FUNCTION

1. THIS AP

Next: &1957, !f3042

BURNER SEAL CHECK FOR OVERHEAT

OUTSIDE MODEL

Next: &nff, f3172

INFORMATION FAN PCB REMOVAL

Next: &nff, !f3904

INFORMATION FAN DEMAND VOLTAGE

THE PWM OR (DEMAND/S

Next: &nff, !f4001

BURNER BAFFLES OUT

FLUE

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP ASSEMBLY - 3 SPEED

Next: End

DHW SENSOR

SENSOR - TEMPERATURE - DHW

Next: End

PRIMARY TEST

INLET PRESSURE

Next: End

PUMP OVERRUN

PCB (FROM FD988)

Next: End

SYPHON

SYPHON ASSEMBLY

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

OPERATIONAL SEQUENCE

DIRECTION CHOICE OR CONTINUE

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (FUSED SPUR)

Next: End

LED AT POWER UP

PCB (FROM FD988)

Next: End

FAULT CODES

Z REDIRECTION

Next: End

NO BLUE LED

FUSE F1 (APPLIANCE PCB)

Next: End

BURNER BAFFLES OUT 1

FLUE

Next: End

DHW COOL

PUMP ASSEMBLY - 3 SPEED

Next: End

HEAT EXCHANGER NOISY

PUMP ASSEMBLY - 3 SPEED

Next: End

OVERHEAT

LIMITER - TEMPERATURE

Next: End

PUMP - DHW COOL RADS COOLPUMP RUNNING PRE TEST 2

PCB (FROM FD988)

Next: End

DHW COOL RADS COOLPUMP RUNNING PRE TEST 2

CABLE - PUMP

Next: End

OVERHEAT

HEAT EXCHANGER ASSEMBLY

Next: End

FURTHER INVESTIGATION

HARNESS - MK3 NO ON/OFF

Next: End

PUMP PULSES

SYSTEM PRESSURE

Next: End

BAFFLES OUT

TUBE GAS SUPPLY

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

BURNER BAFFLES OUT 2

BURNER

Next: End

PUMP PULSES 2

SENSOR - CONTROL

Next: End

PUMP PULSES 2

SENSOR - TEMPERATURE - DHW

Next: End

PUMP PULSING

PUMP ASSEMBLY - 3 SPEED

Next: End

PUMP PULSING

HEAT EXCHANGER ASSEMBLY

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

INTERNAL CLOCK2DHW NOISY

PCB (FROM FD988)

Next: End

EXTERNAL CONTROLS INPUT (DHW)DHW NOISY

Next: End

INTERNAL FAULT

Z REDIRECTION

Next: End

NO BLUE LED 2

Z REDIRECTION

Next: End

FAN DOES NOT RUN

CODE PLUG

Next: End

TURBINE

HARNESS - MK3 NO ON/OFF

Next: End

FAN DOES NOT RUN

SENSOR - CONTROL

Next: End

FAN DOES NOT RUN

SENSOR - TEMPERATURE - DHW

Next: End

BAFFLES OUT 2

TUBE GAS SUPPLY

Next: End

COMBUSTION INCORRECT

TUBE GAS SUPPLY

Next: End

DROP OUT MIN MODE

TUBE GAS SUPPLY

Next: End

CH PERFORMANCE FAIL

TUBE GAS SUPPLY

Next: End

PREHEAT FUNCTION

DIRECTION CHOICE OR CONTINUE

Next: End

BURNER IGNITES

SYPHON ASSEMBLY

Next: End

BURNER IGNITES

INLET PRESSURE

Next: End

DHW FLOW RATE

MAINS WATER SUPPLY

Next: End

BURNER DOES NOT ESTABLISH

SYPHON ASSEMBLY

Next: End

INTERNAL CLOCKDHW NOISY

PCB (FROM FD988)

Next: End

BURNER SEAL FOR OVERHEAT

FLUE / BURNER SEALS

Next: End

DHW COOL RADS HOT DIVERTER MOTOR SWITCHING

PCB (FROM FD988)

Next: End

BOILER UP TO TEMP RADS DO NOT HEAT DIVERTER MOTOR SWITCHING

PCB (FROM FD988)

Next: End

DOES NOT ESTABLISH - FLAME SENSE SHORTING TO EARTH

HARNESS - MK3 NO ON/OFF

Next: End

DHW COOL RADS HOT DIVERTER MOTOR SUPPLY

PCB (FROM FD988)

Next: End

DHW COOL RADS HOT

HARNESS - STEPPER MOTOR

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT DIVERTER MOTOR SUPPLY

PCB (FROM FD988)

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT

HARNESS - STEPPER MOTOR

Next: End

DHW COOL RADS COOL

EXTERNAL MIXING

Next: End

FAN DOES NOT RUN

EXTERNAL MIXING

Next: End

OVERHEAT

SENSOR - CONTROL

Next: End

OVERHEAT

SENSOR - TEMPERATURE - DHW

Next: End

DOES NOT ESTABLISH

TUBE GAS SUPPLY

Next: End

FLAME SENSE BURNER IGNITES

HARNESS - MK3 NO ON/OFF

Next: End

BURNER IGNITES

ELECTRODES

Next: End

DOES NOT ESTABLISH 2

BURNER

Next: End

FAN PRESSURE TEST

TUBE GAS SUPPLY

Next: End

PRIMARY PRE TEST FAN PRESSURE

BURNER

Next: End

FAN PRESSURE TEST

SYPHON ASSEMBLY

Next: End

TIMER - MECHANICAL - MT10

TIMER - MECHANICAL - MT10

Next: End

BURNER DOES NOT IGNITEFAN RUNS OVERHEAT 1

LIMITER 120°C - TEMPERATURE

Next: End

BURNER DOES NOT IGNITEBURNER IGNITION OVERHEAT 1

LIMITER - TEMPERATURE

Next: End

BURNER DOES NOT IGNITE 2

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

PCB AND GAS VALVE

Next: End

BURNER DOES NOT IGNITE

PCB-HARNESS (MAIN)

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

BURNER IGNITION OVERHEAT 1

LIMITER - TEMPERATURE

Next: End

DHW TOO COOL

HEAT EXCHANGER ASSEMBLY

Next: End

DHW TO COOL 2

SENSOR - TEMPERATURE - DHW

Next: End

DHW TO COOL

SENSOR - CONTROL

Next: End

BURNER IGNITES

LEAD - IGNITION

Next: End

BURNER DOES NOT IGNITE

TUBE GAS SUPPLY

Next: End

BURNER IGNITES

ELECTRODES

Next: End

DOES NOT IGNITE PRESSURE DROPS

BURNER

Next: End

DOES NOT IGNITE

HEAT EXCHANGER ASSEMBLY

Next: End

DOES NOT IGNITE

SENSOR - TEMPERATURE - DHW

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 2

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 ASSEMBLY

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 (FROM FD988)

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

SYPHON ASSEMBLY

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 - MK3 NO ON/OFF

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

LEAD - IGNITION

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT

ELECTRODES

Next: End

FAN DOES NOT RUN - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN VOLTAGE PCB - NEW STYLE FAN

PCB (FROM FD988)

Next: End

FAN RUNS - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN RUNS

CABLE CONNECTING FAN ASSEMBLY

Next: End

DOES NOT RUN

FAN ASSEMBLY

Next: End

FAN VOLTAGE PCB

PCB (FROM FD988)

Next: End

FAN DOES NOT RUN

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN RUNS

FAN ASSEMBLY

Next: End

BETWEEN 125 VAC AND 135 VAC - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

ABOVE 135 VAC - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

STSLOW THEN TO TO HIGH SPEED - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

BETWEEN 125 VAC AND 135 VAC

CABLE CONNECTING FAN ASSEMBLY

Next: End

ABOVE 135 VAC

CABLE CONNECTING FAN ASSEMBLY

Next: End

SLOW THEN TO HIGH SPEED

FAN ASSEMBLY

Next: End

STSLOW THEN TO TO HIGH SPEED

CABLE CONNECTING FAN ASSEMBLY

Next: End

BELOW 124 VAC

FAN ASSEMBLY

Next: End

INFORMATION FAN PCB REMOVAL

Z DIRECTION

Next: End

FUSE INVESTIGATION - INCOMPATIBLE

FAN ASSEMBLY

Next: End

FURTHER INVESTIGATION FUSE F1

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT BETWEEN 125 VAC AND 135 VAC - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT ABOVE 135 VAC - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT STSLOW THEN TO TO HIGH SPEED - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

DOES NOT ESTABLISH

INLET PRESSURE

Next: End

VOLATILE LOCKOUT BETWEEN 125 VAC AND 135 VAC

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT ABOVE 135 VAC

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT STSLOW THEN TO TO HIGH SPEED

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT BELOW 124 VAC

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT FAN RUNS 1 - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT FAN RUNS 1 - NEW STYLE FAN

PCB (FROM FD988)

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN RUNS1 FAULT CODE

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN VOLTAGE PCB1 FAULT CODE

PCB (FROM FD988)

Next: End

FAN DOES NOT RUN1 FAULT CODE

CABLE CONNECTING FAN ASSEMBLY

Next: End

FAN RUNS1 FAULT CODE

FAN ASSEMBLY

Next: End

DOES NOT RUN1 FAULT CODE

FAN ASSEMBLY

Next: End

240V ON ALL FAN CONNECTIONS 2

PCB (FROM FD988)

Next: End

240V ON ALL FAN CONNECTIONS 3

PCB (FROM FD988)

Next: End

240 ON ALL FAN CONNECTIONS 4

PCB (FROM FD988)

Next: End

240V ON ALL FAN CONNECTIONS

PCB (FROM FD988)

Next: End

BLANK FOR FAN DEMAND VOLTAGE INFORMATION

Z REDIRECTION

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 ASSEMBLY - 3 SPEED

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 ASSEMBLY - 3 SPEED

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 ASSEMBLY - 3 SPEED

Next: End

RADS DO NOT HEAT

ISOLATION VALVES

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT

PUMP ASSEMBLY - 3 SPEED

Next: End

RADS COLD

VALVE - BY-PASS

Next: End

BURNER BAFFLES OUT

SYPHON ASSEMBLY

Next: End

BURNER BAFFLES OUT

INLET PRESSURE

Next: End

DHW COOL RADIATORS HOT

DIVERTER VALVE ASSEMBLY

Next: End

FURTHER INVESTIGATION FUSE F1

CABLE - PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

CABLE CONNECTING FAN ASSEMBLY

Next: End

OVERHEAT

PCB (FROM FD988)

Next: End

DHW TOO HOT

PCB (FROM FD988)

Next: End

DHW TOO HOT

HARNESS - MK3 NO ON/OFF

Next: End

CH NOISY

PCB (FROM FD988)

Next: End

CH NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

CH NOISY

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION FUSED SPUR

Z REDIRECTION

Next: End

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

Z REDIRECTION

Next: End

FAULT CODES

DIRECTION CHOICE OR CONTINUE

Next: End

NO BLUE LED

Z REDIRECTION

Next: End

BOILER GOES TO OVERHEAT

LIMITER 120°C - TEMPERATURE

Next: End

DHW COOL RADIATORS COOLPUMP RUNNING PRE TEST 2

PUMP ASSEMBLY - 3 SPEED

Next: End

OVERHEAT

HEAT EXCHANGER - PLATE

Next: End

FURTHER INVESTIGATION

GAS VALVE

Next: End

BURNER BAFFLES OUT

HEAT EXCHANGER ASSEMBLY

Next: End

BURNER BAFFLES OUT

GAS VALVE

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

FAN SIGNAL

PCB (FROM FD988)

Next: End

FLOW SENSOR FAN RUNS 2

HARNESS - MK3 NO ON/OFF

Next: End

DHW SENSOR FAN DOES NOT RUN

HARNESS - MK3 NO ON/OFF

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

NOZZLES

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB (FROM FD988)

Next: End

FLAME SENSE

PCB (FROM FD988)

Next: End

DOES NOT REACT TO DH DEMAND CH DEMAND 1

INTERNAL CLOCK

Next: End

OVERHEAT OCCURED

NORMAL OPERATION

Next: End

SHORTING TO EARTH

ELECTRODES

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

BAFFLES OUT

MEMBRANE

Next: End

BAFFLES OUT

FAN ASSEMBLY

Next: End

ELECTRICAL

FLOW SENSOR ASSEMBLY

Next: End

BURNER DOES NOT ESTABLISH

GAS VALVE

Next: End

FAN PRESSURE TEST

MEMBRANE

Next: End

FAN PRESSURE TEST

FAN ASSEMBLY

Next: End

FURTHER INVESTIGATION

PCB (FROM FD988) FUSE INVESTIGATION

Next: End

DOES NOT IGNITE - HIGH RESIST

LIMITER - TEMPERATURE (CORROSION)

Next: End

BURNER DOES NOT IGNITEAPS/FLUE/OH OVERHEAT 1

HARNESS - MK3 NO ON/OFF

Next: End

BURNER IGNITES 2

HARNESS - MK3 NO ON/OFF

Next: End

NOT IGNITING NO DROP

MEMBRANE

Next: End

NOT IGNITING NO DROP

FAN ASSEMBLY

Next: End

BURNER DOES NOT IGNITE2

HEAT EXCHANGER ASSEMBLY

Next: End

BURNER IGNITES

GAS VALVE

Next: End

VOLTAGE GAS VALVE

PCB (FROM FD988)

Next: End

DOES NOT IGNITE - OPEN CIRCUIT

LIMITER - TEMPERATURE (CORROSION)

Next: End

FLUE/OH

HARNESS - MK3 NO ON/OFF

Next: End

GAS VALVE OVERHEAT 1

PCB (FROM FD988)

Next: End

OVERHEAT INVESTIGATION

LIMITER - TEMPERATURE (CORROSION)

Next: End

APS/FLUE/OH OVERHEAT 1

HARNESS - MK3 NO ON/OFF

Next: End

DHW COOL RADIATORS COOL

HEAT EXCHANGER - PLATE

Next: End

DHW SENSOR - TOO COOL RADS COOL

HARNESS - MK3 NO ON/OFF

Next: End

DHW TOO COOL 2

PCB (FROM FD988)

Next: End

NOT IGNITING WITH DROP

MEMBRANE

Next: End

NOT IGNITING WITH DROP

FAN ASSEMBLY

Next: End

BURNER DOES NOT IGNITE

GAS VALVE

Next: End

PUMP DOES NOT RUN DT20

HARNESS - MK3 NO ON/OFF

Next: End

PREHEAT DT20

PCB (FROM FD988)

Next: End

PUMP DOES NOT RUN 2 DT20

HARNESS - MK3 NO ON/OFF

Next: End

PREHEAT DT20

PUMP ASSEMBLY - 3 SPEED

Next: End

PUMP DOES NOT RUN

HARNESS - MK3 NO ON/OFF

Next: End

PREHEAT

PCB (FROM FD988)

Next: End

PUMP DOES NOT RUN 2

HARNESS - MK3 NO ON/OFF

Next: End

PREHEAT

PUMP ASSEMBLY - 3 SPEED

Next: End

BURNER DOES NOT IGNITE

MEMBRANE

Next: End

BURNER DOES NOT IGNITE

FAN ASSEMBLY

Next: End

BURNER DOES NOT EST

HEAT EXCHANGER ASSEMBLY

Next: End

PRIMARY PRE TEST FAN PRESSURE

HEAT EXCHANGER ASSEMBLY

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

HEAT EXCHANGER ASSEMBLY

Next: End

FAN DOES NOT RUNFAULT CODE

HARNESS - MK3 NO ON/OFF

Next: End

FAN DOES NOT RUN 1FAULT CODE

PCB (FROM FD988)

Next: End

VOLATILE LOCKOUTFAULT CODE

HARNESS - MK3 NO ON/OFF

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT NO DROP

MEMBRANE

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT NO DROP

FAN ASSEMBLY

Next: End

DHW BURNER IGNITION ESTABLISH - INTERMITTENT 2

HEAT EXCHANGER ASSEMBLY

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 ASSEMBLY

Next: End

FAN DOES NOT RUN - NEW STYLE FAN

PCB (FROM FD988)

Next: End

DOES NOT RUN - NEW STYLE

FAN ASSEMBLY

Next: End

FAN RUNS - NEW STYLE

FAN ASSEMBLY

Next: End

FAN DOES NOT RUN

PCB (FROM FD988)

Next: End

DOES NOT RUN

FAN PCB

Next: End

FAN RUNS

FAN PCB

Next: End

FAN REDUCES AND STOPS - NEW STYLE

PCB (FROM FD988)

Next: End

SLOW THEN TO HIGH SPEED - NEW STYLE

FAN ASSEMBLY

Next: End

BELOW 124 VAC - NEW STYLE

FAN ASSEMBLY

Next: End

FAN REDUCES AND STOPS

PCB (FROM FD988)

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 REDUCES AND STOPS - NEW STYLE

PCB (FROM FD988)

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED - NEW STYLE

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT BELOW 124 VAC - NEW STYLE

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT FAN REDUCES AND STOPS

PCB (FROM FD988)

Next: End

VOLATILE LOCKOUT SLOW THEN TO HIGH SPEED

FAN PCB

Next: End

VOLATILE LOCKOUT BELOW 124 VAC

FAN PCB

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE FAN

PCB (FROM FD988)

Next: End

VOLATILE LOCKOUT FAN RUNS 1- NEW STYLE

FAN ASSEMBLY

Next: End

VOLATILE LOCKOUT FAN RUNS - NEW STYLE

FAN ASSEMBLY

Next: End

FAN DOES NOT RUN1 FAULT CODE

PCB (FROM FD988)

Next: End

FAN RUNS1 FAULT CODE

FAN PCB

Next: End

DOES NOT RUN1 FAULT CODE

FAN PCB

Next: End

DHW HOT THEN COLD

PCB (FROM FD988)

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 HEAT WITH NO CH DEMAND

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

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p3060

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: p3007

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3010

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

BLUE LED NOT ILLUMINATED

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p1994

BLUE LED FLASHING (FAULT CODE)

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p2007

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

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p2536

FLOW SENSOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p3130

INLET FILTER BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p3132

FLOW REGULATOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p3134

NOZZLES BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p3136

VOLTAGE PRESENT ON TEST 1 BUT DOES NOT DROP OR FLUCTUATES

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p3446

VOLTAGE ABSENT ON TEST 1

CHARACTERISTIC TEST FROM RECTIFICATION VOLTAGE

Next: p3153

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: !p3293

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3295

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3460

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3462

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p3494

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p3508

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3528

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3530

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p3542

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p3545

FLUE STAT CORRODED, DAMAGED, OR MOISTURE PRESENT

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: !p3565

RESISTANCE NOT AS EXPECTED

CHARACTERISTIC TEST FROM RESISTANCE SAFETY CIRCUIT

Next: p3568

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3592

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3594

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3667

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3669

VOLATILE LOCKOUT DISPLAYED WITHIN 10 SECONDS

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3757

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

CHARACTERISTIC TEST FROM OBSERVATION BLUE LED - FAULT CODE

Next: p3941

BURNER DOES NOT IGNITE SMOOTHLY / INTERMITTENT IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p3794

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3806

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3808

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3816

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: p3818

FAN MEMBRANE DAMAGED OR WORN

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3840

FAN STIFF TO TURN OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION FAN MEMBRANE

Next: !p3842

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3848

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3976

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3860

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3980

VOLTAGE ABOVE 120 VAC

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

Next: p3878

VOLTAGE BETWEEN 110 VAC AND 120 VAC

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

Next: p3880

VOLTAGE ABOVE 140 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3890

VOLTAGE BETWEEN 129 VAC AND 140 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3892

VOLTAGE ABOVE 120 VAC

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

Next: p3916

VOLTAGE BETWEEN 110 VAC AND 120 VAC

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

Next: p3918

VOLTAGE ABOVE 140 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3928

VOLTAGE BETWEEN 129 VAC AND 140 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p3930

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3946

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3994

240 VOLTS ABSENT BETWEEN PURPLE/BROWN

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p3958

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

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p3988

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

24/02/2022 14:57:34 2202_1_50_1 01/06/2022 12:29:35

03/05/2022 13:55:34

Next: End

RESISTANCE GAS VALVE MAIN AND HARNESS FURTHER INVESTIGATION

DISCONNECT ST9 CONNE

Next: p1076, f1077

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p2343, !f2344

RESISTANCE PUMP

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

Next: !p1082, !f1083

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p1086, f3905

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1813, !f1814

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: p3031, f3696

RESISTANCE FUSE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1997, f1998

FUSE FURTHER INVESTIGATION

Next: !p1999, !f2000

FUSE FURTHER INVESTIGATION F1

Next: !p2013, !f2014

INSPECTION FLUE

Next: p2990, !f2044

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p2301, !f2302

PUMP VOLTAGE

{GAINPCBACS}

Next: p2320, !f2321

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p2337, !f2338

INTERNAL OR EXTERNAL CONTROLS

Next: p2798, f2799

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p3166, f2801

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2802, !f2803

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p2808, !f2809

INTERNAL FAULT RESET

Next: !p2829, !f2830

INSPECTION CODE PLUG

LOWER THE FACIA PANEL

Next: p2896, !f2897

VOLTS TO TURBINE

Next: p3314, f2901

HARNESS CONTINUITY (TURBINE)

BREAK THE INLINE CON

Next: !p2902, !f2903

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p2906, !f2907

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p2910, !f2911

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p3601, ?3541, ?3543

OBSERVATION COLD MAINS FLOW RATE

Next: p3615, !f3126

INSPECTION SEAL INTEGRITY

Next: !p3173, !f3174

VOLTAGE DIVERTER VALVE AT PCB

NO DEMAND
REMOVE CONNECTOR ST17 FROM PCB

Next: p3227, !f3177

VOLTAGE DIVERTER VALVE AT PCB

NO DEMAND
REMOVE CONNECTOR ST17 FROM PCB

Next: p3232, !f3182

INSPECTION HARNESS ELECTRODE SENSE

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

Next: !p3225, !f3226

CONDENSATE PIPE

Next: p3678, !f3467

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: p3513, ?3493, ?3495

RESISTANCE GAS VALVE

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: !p3517, !f3518

INSPECTION FLUE

Next: p3521, !f3522

RESISTANCE GAS VALVE

REMOVE THE TWO CONNECTORS FROM THE GAS VALVE

Next: p3536, !f3537

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: !p3576, !f3577

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3580, !f3581

OBSERVATION DT20 OR DT20RF FITTED

Next: p3635, f3636

OBSERVATION DISCONNECT DT20 PUMP RUNS?

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

Next: p3637, !f3638

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3641, f3642

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3643, !f3644

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3647, !f3648

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3653, f3654

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3655, !f3656

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3659, !f3660

INSPECTION FLUE

Next: p3664, !f3674

INSPECTION FLUE

Next: p3699, !f3706

OBSERVATION BLUE LED - FAULT CODE

Next: p3911, ?3756, ?3758

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3775, !f3776

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p3779, !f3780

CONDENSATE PIPE

Next: p3797, !f3798

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3846, ?3847, ?3849

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3876, ?3877, ?3879

OBSERVATION FAN TYPE

Next: p3906, !f3907

FAN VOLTAGE CONTROL (PCB) - NEW STYLE

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3914, ?3915, ?3917

VOLTAGE FAN (AT PCB) - NEW STYLE

MOVE CONNECTOR ST5 U

Next: p3944, ?3945, ?3947

BOILER RESET

ENSURE BOILER HAS COOLED

Next: p923, f912

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR

Next: !p3563, ?3564, ?3566

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p106, f3175

RESISTANCE PUMP AND HARNESS

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

Next: p1080, f1081

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR ST5 FROM THE PCB

Next: p3468, f1085

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p822, !f812

RUN BOILER TO MAX TEMP-DOES OVERHEAT OCCUR

ATTACH TEMPERATURE CLAMP TO FLOW PIPE
CH TEMPERATURE CONTROL TO MAX

Next: !p1789, f2300

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

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p1995, f1996

FUSE F1

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p2848, f2012

FURTHER INVESTIGATION LED PROBLEM

Next: !p2003, !f2004

FAULT CODES

SELECT APPROPRIATE FAULT CODE

Next: !p2008, !f2009

PUMP LIMPET TEST

Next: p3573, !f2155

PUMP LIMPET TEST

Next: p703, !f2207

PUMP RUNNING

Next: p924, f2319

PUMP HARNESS CONTINUITY

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

Next: !p2322, !f2323

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p1788, f2334

INSPECTION PRESSURE SYSTEM

Next: p2763, !f2537

INSPECTION GAS SUPPLY TUBE

Next: p992, !f2571

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2616, !f2617

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2739, !f2740

DIFFERENTIAL PRIMARY HEAT EXCHANGER

CH TEMPERATURE CONTR

Next: p2742, !f2794

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: p2759, !f2760

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p2761, !f2762

PUMP LIMPET TEST

Next: p2741, !f2786

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p2806, f2807

OBSERVATION BOILER RESPONDS TO A DEMAND

Next: p2001, !f2852

VOLTS FROM TURBINE

SET FLOW RATE TO APPROX. 3 LITRES PER MINUTE

Next: p2898, f2899

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p2904, f2905

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: p3843, f2909

INSPECTION GAS SUPPLY TUBE

Next: p3260, !f2994

INSPECTION GAS SUPPLY TUBE

Next: !p3009, !f3008

INSPECTION GAS SUPPLY TUBE

Next: !p3011, !f3012

INSPECTION GAS SUPPLY TUBE

Next: !p3032, !f3033

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p3061, f3062

CONDENSATE PIPE

Next: p3080, !f3081

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p3082, !f3083

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p3584, f3481

CHECK FLOW COMPONENTS

ISOLATE AND DRAIN TH

Next: !p3127, ?3129, ?3131, ?3133, ?3135

CONDENSATE PIPE

Next: p3400, !f3139

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p3140, f3663

RECTIFICATION VOLTAGE

{GAINPCBACS}

Next: !p3148, ?3150, ?3152

RESISTANCE HARNESS ELECTRODE SENSE TO EARTH

DISCONNECT CONNECTER

Next: !p3154, f3224

INTERNAL CLOCK

ANY EXTERNAL CH CONT

Next: !p3167, !f3168

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p3137, !f393

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
REMOVE

Next: p3228, !f3229

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p3230, !f3231

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
REMOVE

Next: p3233, !f3234

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT ST17 CONN

Next: !p3235, !f3236

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p2615, ?3292, ?3294

OBSERVATION ISOLATE DHW

TURN HOT WATER TAP ON

Next: !p3315, !f3341

TEMPERATURE DHW AT BOILER

Next: p2153, !f3340

PRIMARY SENSOR (HIGH FLAME)

DISCONNECT PLUG (RE

Next: p3389, !f3386

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p2324, !f3399

INSPECTION GAS SUPPLY TUBE

Next: p3138, !f3434

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p3447, !f3448

ELECTRODE SENSE

REMOVE THE ELECTRODE ASSEMBLY

Next: p3449, !f3450

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3451, !f3452

INSPECTION GAS SUPPLY TUBE

Next: p3455, !f3456

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3457, ?3459, ?3461

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3695, !f3464

RESISTANCE MECHANICAL TIMER (MT10)

Next: !p3469, !f3480

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p3509, !f3510

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p3511, !f3512

VOLTAGE GAS VALVE AT PCB

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

Next: p3514, f3535

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT ST9 CONNE

Next: p3515, f3516

FAN PRESSURE TEST (IGNITION)

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p3519, f3520

INSPECTION GAS SUPPLY TUBE

Next: !p3533, !f3534

INSPECTION GAS SUPPLY TUBE

Next: p3523, !f3524

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3525, ?3527, ?3529

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3531, !f3532

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p3538, !f3539

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p3546, !f3547

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p3548, !f3549

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p3569, !f3570

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p3571, !f3572

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE C

Next: p3574, f3575

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: p3578, f3579

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p3582, !f3583

ELECTRODE SPARK HARNESS

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

Next: p3585, !f3586

INSPECTION GAS SUPPLY TUBE

Next: p3587, !f3588

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3589, ?3591, ?3593

INSPECTION SPARK ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: p3595, !f3596

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p3597, !f3598

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p3599, !f3600

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p3873, !f3614

INSPECTION DHW ISOLATION VALVE

Next: p3125, !f3626

INSPECTION DIVERTER VALVE PADDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p805, !f3633

VOLTS TO PUMP (PREHEAT)

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

Next: p3651, f3652

VOLTS TO PUMP (PREHEAT)

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

Next: p3639, f3640

PUMP HARNESS CONTINUITY

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

Next: !p3649, !f3650

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3645, f3646

PUMP HARNESS CONTINUITY

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

Next: !p3661, !f3662

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3657, f3658

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3665, ?3666, ?3668

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3677, !f3671

INSPECTION FLUE

Next: p3454, !f3694

INSPECTION GAS SUPPLY TUBE

Next: p3700, !f3701

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3709, !f3703

INSPECTION CODE PLUG

LOWER THE FACIA PANEL

Next: p3771, !f3772

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR

Next: p3773, f3774

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR

Next: !p3777, f3778

FAN PRESSURE TEST

ATTACH PRESSURE GAUG

Next: p3795, f3796

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p3811, !f3812

INSPECTION FLUE

Next: p3799, !f3800

INSPECTION GAS SUPPLY TUBE

Next: p3801, !f3802

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: p3803, ?3805, ?3807

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3809, !f3810

COMBUSTION ANALYSIS MAX AND MIN

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

Next: p3813, ?3815, ?3817

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p3823, !f3824

INSPECTION GAS SUPPLY TUBE

Next: !p3821, !f3822

INSPECTION GAS SUPPLY TUBE

Next: !p3819, !f3820

CONDENSATE PIPE

Next: p3825, !f3826

INSPECTION FLUE OH STAT

Next: p3827, !f3828

INSPECTION GAS SUPPLY TUBE

Next: p3829, !f3830

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SEN

Next: p3831, !f3832

ELECTRODE SPARK HARNESS

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

Next: p3833, !f3834

INSPECTION ELECTRODES

REMOVE THE ELECTRODE ASSEMBLY

Next: p3835, !f3836

INSPECTION FAN MEMBRANE

REMOVE FAN ASSEMBLY FROM APPLIANCE

Next: !p3837, ?3839, ?3841

OBSERVATION FAN TYPE

Next: p3844, f3845

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3857, ?3859, ?3861

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3853, !f3854

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3851, !f3852

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3855, !f3856

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3867, !f3868

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3863, !f3864

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3865, !f3866

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3869, !f3870

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3871, !f3872

OBSERVATION FAN TYPE

Next: p3874, f3875

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3887, ?3889, ?3891

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3885, !f3886

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3883, !f3884

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3881, !f3882

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3899, !f3900

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3895, !f3896

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3893, !f3894

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3897, !f3898

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3901, !f3902

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3908, !f3909

OBSERVATION FAN TYPE

Next: p3912, f3913

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p3925, ?3927, ?3929

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3923, !f3924

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3921, !f3922

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3919, !f3920

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3937, !f3938

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3933, !f3934

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3931, !f3932

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3935, !f3936

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3939, !f3940

OBSERVATION FAN TYPE

Next: p3942, f3943

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p3955, ?3957, ?3959

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3951, !f3952

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3949, !f3950

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p3953, !f3954

VOLTAGE FAN (PCB DEMAND)

DISCONNECT ELECTRICA

Next: p3967, !f3968

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3973, !f3962

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: p3969, !f3970

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3971, !f3972

INSPECTION FAN

REMOVE PCB FROM FAN ASSEMBLY (FOR INSTRUCTIONS CLICK HERE)

Next: !p3974, !f3975

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3850, !f3987

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3862, !f3986

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3960, !f3998

VOLTAGE MAINS GND PWM AND HALL

REMOVE THE CONNECTOR

Next: p3948, !f3999

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p678, !f674

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, !f2796

INSPECTION VESSEL PRESSURE

CLOSE FLOW AND RETURN ISOLATION VALVES
DISCHARGE PRIMARY SYSTEM WATER

Next: !p718, !f719

INSPECTION PRESSURE SYSTEM

Next: p2184, !f760

INSPECTION PRESSURE SYSTEM

Next: p3320, !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: p3627, f3180

INSPECTION PRESSURE SYSTEM

Next: p2307, !f925

PUMP LIMPET TEST

Next: p3372, !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: p2567, f2042

INSPECTION FLUE

Next: p2738, !f1011

System Information

Total Tests: 641

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control