XSol Diagnostic System

ALPHA HE CB

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &3, !f2

OBSERVATION LED ILLUMINATED

SELECTOR SWITCH TO DHW AND CH POSITION
ENSURE NO DEMANDS

Next: &895, ?98, ?129

DHW FLOW RATE

Next: &119, f87

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &86, !f116

OBSERVATION PUMP RUNS

Next: &206, f424

OBSERVATION FAN RUNS

Next: &226, f209

OBSERVATION BURNER IGNITION AND ESTABLISH

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE

Next: &287, ?227, ?229, ?231, ?233

PRESSURE BURNER MINIMUM

ATTACH U GAUGE TO BURNER PRESSURE TEST POINT
REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE

Next: &307, ?288, ?290

OPERATION DHW OUTPUT

BOILER DHW THERMOSTAT SET TO MAX
BOTH WIRES CONNECTED TO MODUREG

Next: &1135, ?311, ?313, ?315, ?1067

OPERATION DHW MODULATION

BOILER DHW THERMOSTA

Next: &1137, f437

OPERATION CH

CH THERMOSTAT SET TO MAX

Next: &494, ?444, ?446, ?448, ?477

OPERATION PUMP OVERRUN

Next: &nff, !f495

HEADER FOR THERMISTOR FAULT CODE

INTENTIONALLY BLANK

Next: &nff, f1194

HEADER FOR LOW PRESSURE FAULT CODE

INTENTIONALLY BLANK

Next: &nff, f508

HEADER FOR AIR FLOW FAULT CODE

INTENTIONALLY BLANK

Next: &nff, f600

HEADER FOR OVERHEAT FAULT CODE

INTENTIONALLY BLANK

Next: &nff, f651

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK

Next: &nff, f721

HOW TO SET MULTIMETER TO DIODE TEST

THE IMAGES BELOW SHO

Next: &nff, !f826

OBSERVATION BOILER STANDBY

ENSURE NO DEMANDS
BOILER DHW THERMOSTAT SET TO MAX
BOILER CH THERMOSTAT SET TO MAX

Next: &115, ?896, ?916

OPERATION DHW MINIMUM FLOW RATE - DIAPHRAGM CONDITION CHECK

ENSURE APPLIANCE IS COOL
RUN HOT WATER TAP WITH A FLOW RATE OF 3 LITRES PER MINUTE

Next: &1305, !f1136

OBSERVATION DHW DEMAND END

Next: &408, !f1138

HEADER FOR RAPID TEMPERATURE RISE FAULT CODE

INTENTIONALLY BLANK

Next: &nff, f1234

PRESSURE BURNER MAXIMUM

ATTACH U GAUGE TO BU

Next: &317, f1306

BLANK FOR UNABLE TO SET MINIMUM 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

MINIMUM EXCESSIVE

TUBE 4 X 8 SILICONE

Next: End

MINIMUM TOO HIGH

TUBE 4 X 8 SILICONE

Next: End

INCORRECT DIFFERENTIAL

Next: End

LOW 6

INLET PRESSURE

Next: End

FAULTY MODUREG

GAS VALVE - HONEYWELL VK4105M5009

Next: End

NOT ENOUGH VOLTAGE TO MODUREG

PCB

Next: End

NOT GOING TO MAXIMUM PRESSURE

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR MAXIMUM ADJUSTMENT

Z DIRECTION CHOICE OR CONTINUE

Next: End

INCORRECT MAXIMUM

TUBE 4 X 8 SILICONE

Next: End

NO MODULATION 2

SENSOR - TEMPERATURE - NTC

Next: End

SHORTED TO EARTH DAMAGED PCB

PCB AND GV & FAN/OH CABLE ASSEMBLY

Next: End

SHORTED TO EARTH BLOWING FUSE

PCB AND GV & FAN/OH CABLE ASSEMBLY

Next: End

INCORRECT MAXIMUM BAFFLING

TUBE 4 X 8 SILICONE

Next: End

LOW 6 BAFFLING

INLET PRESSURE

Next: End

FAULTY MODUREG BAFFLING

GAS VALVE - HONEYWELL VK4105M5009

Next: End

NOT ENOUGH VOLTAGE TO MODUREG BAFFLING

PCB

Next: End

NOT GOING TO MAXIMUM PRESSURE BAFFLING

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR MAXIMUM ADJUSTMENT BAFFLING

Z DIRECTION CHOICE OR CONTINUE

Next: End

DAMAGED RESTRICTED OR BLOCKED AT MAX

BURNER

Next: End

FLUEWAYS BLOCKED AT MAX

PRIMARY HEAT EXCHANGER

Next: End

WEAK OR WORN DIAPHRAGM

DIVERTER VALVE ASSEMBLY

Next: End

INTERMITTENTLY PLAYING UP - KNOWN FAULT

SWITCH - FLOW - DHW

Next: End

TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

RESTRICTED BLOCKED OR SPLIT

AIR PRESSURE SWITCH TUBE

Next: End

RESTRICTED OR BLOCKED 2

PRESSURE POINT - TAKE OFF

Next: End

RESTRICTED OR BLOCKED

FLUE

Next: End

NOT MAKING AT CORRECT PRESSURE

SWITCH - AIR PRESSURE

Next: End

SPARK GAP INCORRECT

IGNITION ELECTRODES

Next: End

POOR CONDITION

KIT - IGNITION ELECTRODE LEAD

Next: End

FAULT CODE

SENSOR - TEMPERATURE - NTC

Next: End

FAULT CODE 2

SENSOR - TEMPERATURE - NTC

Next: End

THERMISTOR FAULT CODE

PCB

Next: End

THERMISTORS PLAY UP AT CERTAIN TEMPERATURES

INTERMITTENT THERMISTOR FAULT

Next: End

GIVING DEMAND INCORRECTLY

Next: End

WATER FLOW WHEN SHOULDNT BE

DRIPPING TAP OR LEAK ON PIPEWORK

Next: End

STICKING MADE

SWITCH - FLOW - DHW

Next: End

READING COLD 2

SENSOR - TEMPERATURE - NTC

Next: End

CORRECTLY ACTIVATED

FROST PROTECTION

Next: End

RAPID TEMP RISE FAULT CODE

SYSTEM PRESSURE

Next: End

RAPID TEMP RISE FAULT CODE

PCB

Next: End

RAPID TEMP RISE FAULT CODE

PUMP 15 - 60 GRUNDFOS

Next: End

RAPID TEMP RISE FAULT CODE

Next: End

RAPID TEMP RISE FAULT CODE

Next: End

INCORRECT MAXIMUM 2

TUBE 4 X 8 SILICONE

Next: End

INCORRECT MAXIMUM

INLET PRESSURE

Next: End

INCORRECT MAXIMUM 2

GAS VALVE - HONEYWELL VK4105M5009

Next: End

INCORRECT MAXIMUM

PCB

Next: End

INCORRECT MAXIMUM

GAS VALVE - HONEYWELL VK4105M5009

Next: End

INCORRECT MAXIMUM

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO MAX BP 2

SENSOR - TEMPERATURE - NTC

Next: End

NO AIR CHARGE

EXPANSION VESSEL 8 LITRES

Next: End

NOT ACTIVATING FLOW SWITCH

DIVERTER VALVE ASSEMBLY

Next: End

NOT MAKING

SWITCH - FLOW - DHW

Next: End

STOPPING DEMAND 2

SENSOR - TEMPERATURE - NTC

Next: End

BURNER IGNITION

THERMOSTAT - FLUE LIMIT

Next: End

BAFFLES OUT

HEAT EXCHANGER - CONDENSING

Next: End

BAFFLES OUT 2

HEAT EXCHANGER - CONDENSING

Next: End

NO SPARKING

HEAT EXCHANGER - CONDENSING

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER - CONDENSING

Next: End

OVERHEAT FAULT CODE

HEAT EXCHANGER - CONDENSING

Next: End

DHW HOT AND COLD

HEAT EXCHANGER - CONDENSING

Next: End

FAULT CODE RAPID RISE

HEAT EXCHANGER - CONDENSING

Next: End

FILTER DHW

FILTER

Next: End

OPENING WHEN SHOULD NOT OR STUCK OPEN

BYPASS ASSEMBLY

Next: End

BURNER DOES NOT EST

TRAP - CONDENSATE

Next: End

BURNER DOES NOT EST

HEAT EXCHANGER - CONDENSING

Next: End

OUT OF CALIBRATION TRIPPING EARLY

THERMOSTAT OVERHEAT

Next: End

FAULT CODE OVERHEAT 2

THERMOSTAT - FLUE LIMIT

Next: End

FUSE FURTHER INVESTIGATION

THERMOSTAT - FLUE LIMIT

Next: End

OUT OF RANGE

SENSOR - TEMPERATURE - NTC

Next: End

READING COLD

SENSOR - TEMPERATURE - NTC

Next: End

OUT OF CALIBRATION READING HOT

SENSOR - TEMPERATURE - NTC

Next: End

PUMP NOT RUNNING OUT OF RANGE

SENSOR - TEMPERATURE - NTC

Next: End

READING HOT WHEN COLD 2

SENSOR - TEMPERATURE - NTC

Next: End

READING HOT WHEN COLD 3

SENSOR - TEMPERATURE - NTC

Next: End

READING HOT WHEN COLD 4

SENSOR - TEMPERATURE - NTC

Next: End

NO MAX BP

SENSOR - TEMPERATURE - NTC

Next: End

NO MODULATION

SENSOR - TEMPERATURE - NTC

Next: End

STOPPING DEMAND

SENSOR - TEMPERATURE - NTC

Next: End

OVERHEAT

SENSOR - TEMPERATURE - NTC

Next: End

RAPID TEMP RISE FAULT CODE

SENSOR - TEMPERATURE - NTC

Next: End

FAULT CODE AIR FLOW

HEAT EXCHANGER - CONDENSING

Next: End

BLANK FOR CASE OFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

STUCK MADE

SWITCH - AIR PRESSURE

Next: End

RESTRICTED OR BLOCKED

AIR PRESSURE SWITCH TUBE

Next: End

LOW

INLET PRESSURE

Next: End

LOW 2

INLET PRESSURE

Next: End

SPARK GAP OR ALIGNTMENT INCORRECT

IGNITION ELECTRODES

Next: End

RESTRICTED OR BLOCKED

BURNER

Next: End

NOT RECTIFYING

ELECTRODE - FLAME SENSING

Next: End

NOT RECTIFYING

KIT - ELECTRODE LEAD - FLAME SENSING

Next: End

DAMAGED RESTRICTED OR BLOCKED

BURNER

Next: End

FLUEWAYS BLOCKED

PRIMARY HEAT EXCHANGER

Next: End

LOW 5

INLET PRESSURE

Next: End

READING HOT WHEN COLD 5

SENSOR - TEMPERATURE - NTC

Next: End

FAILING LIMPET - WEAK OR SLOW

PUMP 15 - 60 GRUNDFOS

Next: End

NOT GIVING CH DEMAND

Next: End

OPEN CIRCUIT TO CLOCK

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

OPEN CIRCUIT

TIMER

Next: End

OPEN CIRCUIT TO CLOCK 2

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

NOT TURING POT ON PCB

KNOB - CONTROL - DHW / CH

Next: End

READING HOT WHEN COLD 6

SENSOR - TEMPERATURE - NTC

Next: End

FAILING LIMPET - WEAK OR SLOW 2

PUMP 15 - 60 GRUNDFOS

Next: End

NOT GIVING CH DEMAND 2

Next: End

OPEN CIRCUIT TO CLOCK 3

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

OPEN CIRCUIT 2

TIMER

Next: End

OPEN CIRCUIT TO CLOCK 4

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

NOT SWITCHING ON

KNOB - SWITCH - SELECTOR

Next: End

NO DHW DEMAND

KNOB - SWITCH - SELECTOR

Next: End

NOT TURNING POT ON PCB 2

KNOB - CONTROL - DHW / CH

Next: End

NOT GIVING CH DEMAND 3

Next: End

OPEN CIRCUIT TO CLOCK 6

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

OPEN CIRCUIT 3

TIMER

Next: End

OPEN CIRCUIT TO CLOCK 5

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

FLAT

EXPANSION VESSEL 8 LITRES

Next: End

NOT TURNING POT ON PCB

KNOB - CONTROL - DHW / CH

Next: End

FAILING LIMPET WEAK OR SLOW 3

PUMP 15 - 60 GRUNDFOS

Next: End

OPEN TOO MUCH

Next: End

KEEPING DIVERTER IN WRONG POSITION

DRIPPING TAP OR LEAK ON PIPEWORK

Next: End

FAULTY OVERRUN

PCB

Next: End

LOW CAUSING POOR DHW

SYSTEM PRESSURE

Next: End

LOW CAUSING HOT AND COLD DHW

SYSTEM PRESSURE

Next: End

POOR HEATING

SYSTEM PRESSURE

Next: End

STUCK MADE FAULT CODE

SWITCH - AIR PRESSURE

Next: End

RESTRICTED OR BLOCKED FAULT CODE

AIR PRESSURE SWITCH TUBE

Next: End

NOT MAKING AT CORRECT PRESSURE FAULT CODE

SWITCH - AIR PRESSURE

Next: End

RESTRICTED BLOCKED OR SPLIT FAULT CODE 2

AIR PRESSURE SWITCH TUBE

Next: End

RESTRICTED OR BLOCKED FAULT CODE 2

PRESSURE POINT - TAKE OFF

Next: End

RESTRICTED OR BLOCKED FAULT CODE

FLUE

Next: End

OVERHEAT FAULT CODE

SYSTEM PRESSURE

Next: End

NO POWER TO PUMP FAULT CODE

PCB

Next: End

FAILING LIMPET WEAK OR SLOW OVERHEAT

PUMP 15 - 60 GRUNDFOS

Next: End

BLOWING FUSES

GAS VALVE - HONEYWELL VK4105M5009

Next: End

CAUSING FUSE TO BLOW

FAN ASSEMBLY

Next: End

CAUSING FUSE TO BLOW

PUMP 15 - 60 GRUNDFOS

Next: End

SHUT TOO MUCH

Next: End

OPEN CIRCUIT

THERMOSTAT OVERHEAT

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

NO POWER TO GAS VALVE

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

CAUSING FUSE TO BLOW 2

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

CLOSED

ISOLATING VALVE

Next: End

OPEN CIRCUIT FAULT CODE

THERMOSTAT OVERHEAT

Next: End

STUCK MADE FAULT CODE OVERHEAT

SWITCH - AIR PRESSURE

Next: End

RESTRICTED OR BLOCKED FAULT CODE OVERHEAT

AIR PRESSURE SWITCH TUBE

Next: End

BLANK FOR MULTIMETER PAGE

Z DIRECTION CHOICE OR CONTINUE

Next: End

GAS VALVE HARNESS DAMAGED PCB

PCB AND GV & FAN/OH CABLE ASSEMBLY

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (MAINS)

Next: End

FUSE F1

FUSE F2A 250V

Next: End

BLANK FOR PCB INVESTIGATION 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

POOR DHW FLOW

VALVE - INLET 0.5 IN - COLD WATER

Next: End

INADEQUATE WATER SUPPLY

WATER SUPPLY TO PREMISES

Next: End

UNABLE TO SET MINIMUM PRESSURE NOT IGNITING

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR MINIMUM MODUREG ADJUSTMENT

Z DIRECTION CHOICE OR CONTINUE

Next: End

UNABLE TO SET MINIMUM

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR UNABLE TO SET MINIMUM

Z DIRECTION CHOICE OR CONTINUE

Next: End

UNABLE TO SET MINIMUM PRESSURE 2

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR MINIMUM ADJUSTMENT NOT IGNITING

Z DIRECTION CHOICE OR CONTINUE

Next: End

SPARKING NOT IGNITING

TUBE 4 X 8 SILICONE

Next: End

LOW 3

INLET PRESSURE

Next: End

UNABLE TO SET MINIMUM PRESSURE ESTABLISH

GAS VALVE - HONEYWELL VK4105M5009

Next: End

BLANK FOR MINIMUM MODUREG ADJUSTMENT NOT ESTABLISHING

Z DIRECTION CHOICE OR CONTINUE

Next: End

IGNITING NOT ESTABLISHING

TUBE 4 X 8 SILICONE

Next: End

IGNITES BUT BAFFLES

TUBE 4 X 8 SILICONE

Next: End

LOW 4

INLET PRESSURE

Next: End

UNABLE TO SET MINIMUM 2

GAS VALVE - HONEYWELL VK4105M5009

Next: End

IGNITES BUT BAFFLES

GAS VALVE MINIMUM ADJUSTMENT

Next: End

MODUREG

NTC / APS CABLE ASSEMBLY

Next: End

POOR HOT WATER

GAS VALVE MAXIMUM ADJUSTMENT

Next: End

NOT MODULATING

PCB

Next: End

NO POWER TO GAS VALVE

PCB

Next: End

PCB CAUSING FUSE TO BLOW

PCB MAIN - FUSE

Next: End

MODUREG BAFFLING

NTC / APS CABLE ASSEMBLY

Next: End

POOR HOT WATER BAFFLING

GAS VALVE MAXIMUM ADJUSTMENT

Next: End

BLOCKED OR STUCK2

GAUGE - PRESSURE

Next: End

BLOCKED OR STUCK BUT SHOWING SOME PRESSURE 2

GAUGE - PRESSURE

Next: End

NO LEDS NO RESPONSE

SYSTEM PRESSURE

Next: End

NO RESPONSE WITH NO LED

PCB

Next: End

NO LEDS NO RESPONSE

CABLE- PRIMARY PRESSURE SWITCH

Next: End

FAULTY OR BLOCKED 2

SWITCH PRIMARY PRESSURE

Next: End

NO LED ILLUMINATED NO RESPONSE

LOW PRESSURE SWITCH BLOCKAGE

Next: End

NO LEDS NO RESPONSE

PIPE 18MM DIA - RS CHAMBER TO DIVERTER VALVE

Next: End

BLANK FOR FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

RUNNING BUT SLOW OR DIRTY

FAN ASSEMBLY

Next: End

SECTION TO APS OPEN CIRCUIT

NTC / APS CABLE ASSEMBLY

Next: End

NO SPARK

PCB

Next: End

FAULT CODE

NTC / APS CABLE ASSEMBLY

Next: End

FAULT CODE 2

NTC / APS CABLE ASSEMBLY

Next: End

INTERMITTENT - KNOWN ISSUE

SENSOR - TEMPERATURE - NTC

Next: End

FAULTY STUCK MADE

DIVERTER VALVE ASSEMBLY

Next: End

SECTION TO DHW THERMISTOR

NTC / APS CABLE ASSEMBLY

Next: End

FIRING WITH NO DEMAND

PCB

Next: End

RAPID TEMP RISE FAULT CODE 2

PUMP 15 - 60 GRUNDFOS

Next: End

RAPID TEMP RISE FAULT CODE

CABLE - PUMP

Next: End

RAPID TEMP RISE FAULT CODE

HEAT EXCHANGER - DHW

Next: End

BLANK FOR RAPID TEMPERATUR INCREASE

Z DIRECTION CHOICE OR CONTINUE

Next: End

INCORRECT MAXIMUM

NTC / APS CABLE ASSEMBLY

Next: End

INCORRECT MAXIMUM

GAS VALVE MAXIMUM ADJUSTMENT

Next: End

FAULT CODE

SYSTEM PRESSURE

Next: End

WORN NIPPLE

SWITCH - FLOW - DHW

Next: End

SECTION TO DHW MICROSWITCH

NTC / APS CABLE ASSEMBLY

Next: End

BLOCKED OR STUCK 3

GAUGE - PRESSURE

Next: End

BLOCKED OR STUCK BUT SHOWING SOME PRESSURE 3

GAUGE - PRESSURE

Next: End

PUMP DOES NOT RUN

SYSTEM PRESSURE

Next: End

PUMP DOES NOT RUN

PCB

Next: End

PUMP DOES NOT RUN

CABLE- PRIMARY PRESSURE SWITCH

Next: End

FAULTY OR BLOCKED 3

SWITCH PRIMARY PRESSURE

Next: End

PUMP DOES NOT RUN

LOW PRESSURE SWITCH BLOCKAGE

Next: End

PUMP DOES NOT RUN

PIPE 18MM DIA - RS CHAMBER TO DIVERTER VALVE

Next: End

NO POWER TO FAN

PCB

Next: End

FAN NOT RUNNING

NTC / APS CABLE ASSEMBLY

Next: End

OPEN CIRCUIT WIRES TO OVERHEAT STAT

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

RESTRICTED OR FAULTY SEALS

FLUE

Next: End

RESTRICTED OR FAULTY SEALS AT MAX

FLUE

Next: End

DHW COOL RADS COOL

PRIMARY HEAT EXCHANGER - WATERWAYS

Next: End

FAULT CODE OVERHEAT

PRIMARY HEAT EXCHANGER - WATERWAYS

Next: End

DHW HOT AND COLD

PRIMARY HEAT EXCHANGER - WATERWAYS

Next: End

RAPID TEMP RISE FAULT CODE

PRIMARY HEAT EXCHANGER - WATERWAYS

Next: End

HEAT EXCHANGER - DHW

Next: End

POOR CIRCULATION CAUSING INTEGRAL BYPASS TO OPEN

Next: End

BURNER DOES NOT EST

CONDENSATE LEVEL SENSOR

Next: End

FAULT CODE

OVERHEAT INFORMATION PAGE

Next: End

FAULT CODE OVERHEAT

THERMOSTAT - FLUE LIMIT

Next: End

OPEN CIRCUIT WIRES TO OVERHEAT FAULT CODE

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

SEIZED OR BURNT OUT

FAN ASSEMBLY

Next: End

NO POWER TO FAN

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

SECTION TO APS SHORTED

NTC / APS CABLE ASSEMBLY

Next: End

RESTRICTED OR BLOCKED

PRESSURE POINT - TAKE OFF

Next: End

RESTRICTED OR BLOCKED

MANIFOLD - GAS

Next: End

NOT RECTIFYING

PCB

Next: End

PASSING TO RADIATORS

DIVERTER VALVE ASSEMBLY

Next: End

RESTRICTED OR BLOCKED

HEAT EXCHANGER - DHW

Next: End

NOT RESPONDING TO CH DEMAND

PCB

Next: End

NOT RESPONDING TO CH DEMAND 2

PCB

Next: End

RESTRICTED OR BLOCKED 2

HEAT EXCHANGER - DHW

Next: End

NOT RESPONDING TO CH DEMAND 3

PCB

Next: End

NOT RESPONDING TO CH DEMAND 4

PCB

Next: End

HOT AND COLD DHW - MODULATION

PCB

Next: End

NOT RUNNING

PUMP 15 - 60 GRUNDFOS

Next: End

NO POWER TO PUMP

CABLE - PUMP

Next: End

NOT RESPONDING TO CH DEMAND 6

PCB

Next: End

NOT RESPONDING TO CH DEMAND 5

PCB

Next: End

BLOCKED

PIPE 8MM DIA - EXPANSION VESSEL

Next: End

NOT CONTROLING CH TEMP CORRECTLY

PCB

Next: End

STUCK IN DHW POSITION

DIVERTER VALVE ASSEMBLY

Next: End

POOR CIRCULATION

Next: End

BLOCKED OR STUCK

GAUGE - PRESSURE

Next: End

LOW PRESSURE FAULT CODE

PCB

Next: End

TO PRESSURE SWITCH

CABLE- PRIMARY PRESSURE SWITCH

Next: End

BLOCKED OR STUCK BUT SHOWING SOME PRESSURE

GAUGE - PRESSURE

Next: End

SEIZED OR BURNT OUT FAULT CODE

FAN ASSEMBLY

Next: End

NO POWER TO FAN FAULT CODE

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

SECTION TO APS SHORTED FAULT CODE

NTC / APS CABLE ASSEMBLY

Next: End

RESTRICTED OR BLOCKED FAULT CODE

PRESSURE POINT - TAKE OFF

Next: End

SECTION TO APS OPEN CIRCUIT FAULT CODE

NTC / APS CABLE ASSEMBLY

Next: End

RUNNING BUT SLOW OR DIRTY FAULT CODE

FAN ASSEMBLY

Next: End

AIR FLOW FAULT CODE

PCB

Next: End

NOT RUNNING OVERHEAT

PUMP 15 - 60 GRUNDFOS

Next: End

NO POWER TO PUMP FAULT CODE

CABLE - PUMP

Next: End

RESTRICTED OR BLOCKED OVERHEAT

HEAT EXCHANGER - DHW

Next: End

TEMPERATURE CONTROL OVERHEAT

PCB

Next: End

CAUSING FUSE TO BLOW

CABLE - GAS VALVE/FAN/OVERHEAT STAT

Next: End

CAUSING FUSE TO BLOW

CABLE - PUMP

Next: End

NO IGNITION PRESSURE

GAS VALVE - HONEYWELL VK4105M5009

Next: End

REGISTERING OVERHEAT WHEN NOT

PCB

Next: End

AIR FLOW FAULT CODE OVERHEAT

PCB

Next: End

SECTION TO APS SHORTED FAULT CODE OVERHEAT

NTC / APS CABLE ASSEMBLY

Next: End

RESTRICTED OR BLOCKED FAULT CODE OVERHEAT

PRESSURE POINT - TAKE OFF

Next: End

FAULTY OR BLOCKED

SWITCH PRIMARY PRESSURE

Next: End

FAULT CODE

LOW PRESSURE SWITCH BLOCKAGE

Next: End

FAULT CODE

PIPE 18MM DIA - RS CHAMBER TO DIVERTER VALVE

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION FUSE F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

INCOMING MAINS WIRING

CABLE - CLOCK TO TERMINAL BLOCK

Next: End

BLANK FOR PCB INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNNING CONTINUOUSLY

PCB

Next: End

RESTRICTED OR BLOCKED 2

MANIFOLD - GAS

Next: End

FURTHER INVESTIGATION MAINS FUSE

Z DIRECTION CHOICE OR CONTINUE

Next: End

NOT IGNITING

GAS VALVE MINIMUM ADJUSTMENT

Next: End

MINIMUM SET TOO HIGH

GAS VALVE MINIMUM ADJUSTMENT

Next: End

MINIMUM TOO LOW

GAS VALVE MINIMUM ADJUSTMENT

Next: End

IGNITING BUT NOT ESTABLISHING

GAS VALVE MINIMUM ADJUSTMENT

Next: End

BURNER BAFFLES DURING DHW OPERATION

CHARACTERISTIC TEST FROM OPERATION DHW OUTPUT

Next: p1069

SYSTEM PRESSURE OK BUT GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1095

SYSTEM PRESSURE LOW AND GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1097

SYSTEM PRESSURE LOW AND GAUGE DOES CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1099

LOW PRESSURE SWITCH BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p1106

LOW PRESSURE SWITCH CONNECTION BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p1108

NO LEDS ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION LED ILLUMINATED

Next: p409

SYSTEM PRESSURE OK BUT GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1371

SYSTEM PRESSURE LOW AND GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1373

SYSTEM PRESSURE LOW AND GAUGE DOES CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p1375

LOW PRESSURE SWITCH BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p1382

LOW PRESSURE SWITCH CONNECTION BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p1384

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p228

SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p1172

BURNER IGNITES SMOOTHLY BUT DOES NOT ESTABLISH (SPARKING CONTINUES)

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p232

BURNER IGNITES BUT BAFFLES OUT

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION AND ESTABLISH

Next: p294

NO PRESSURE MEASURED

CHARACTERISTIC TEST FROM PRESSURE BURNER IGNITION

Next: p257

PRESSURE PRESENT BUT INCORRECT

CHARACTERISTIC TEST FROM PRESSURE BURNER IGNITION

Next: p974

PRESSURE EXCESSIVE

CHARACTERISTIC TEST FROM PRESSURE BURNER MINIMUM

Next: p1002

PRESSURE LOW

CHARACTERISTIC TEST FROM PRESSURE BURNER MINIMUM

Next: p308

TEMP RISE UNSATISFACTORY RADS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW OUTPUT

Next: !p312

TEMP RISE UNSATISFACTORY RADS DO NOT BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW OUTPUT

Next: p526

DHW RUNS HOT AND COLD

CHARACTERISTIC TEST FROM OPERATION DHW OUTPUT

Next: p557

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE FOR PUMP NOT RUNNING

Next: p1439

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE FOR PUMP NOT RUNNING

Next: p359

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE FOR PUMP NOT RUNNING

Next: p1446

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE FOR PUMP NOT RUNNING

Next: p387

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION CH

Next: p450

EXCESSIVE SYSTEM PRESSURE RISE AS TEMPERATURE INCREASES

CHARACTERISTIC TEST FROM OPERATION CH

Next: p447

BOILER AND RADIATOR TEMPERATURE REMAINS LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p449

BOILER UP TO TEMPERATURE BUT RADIATORS DO NOT HEAT SUFFICIENTLY OR REMAIN COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p583

SYSTEM PRESSURE OK BUT GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p516

SYSTEM PRESSURE LOW AND GAUGE DOES NOT CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: !p556

SYSTEM PRESSURE LOW AND GAUGE DOES CHANGE WHEN PRESSURE ADDED

CHARACTERISTIC TEST FROM INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: p1351

OVERHEAT FAULT CODE OCCURS BELOW 82 DEGREES

CHARACTERISTIC TEST FROM OBSERVATION RUN APPLIANCE TO MAX TEMP

Next: p1476

BOILER TEMPERATURE EXCEEDS 82 DEGREES AND BURNER REMAINS ALIGHT

CHARACTERISTIC TEST FROM OBSERVATION RUN APPLIANCE TO MAX TEMP

Next: !p718

BURNER DOES NOT RE IGNITE AND OVERHEAT FAULT CODE RETURNS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET TEMPERATURE RELATED FAULT

Next: p811

BOILER DOES NOT COMMENCE IGNTION SEQUENCE OVERHEAT FAULT CODE REMAINS

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESET TEMPERATURE RELATED FAULT

Next: p816

LOW PRESSURE SWITCH BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p834

LOW PRESSURE SWITCH CONNECTION BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION LOW PRESSURE SWITCH AND CONNECTION

Next: !p836

BOILER TRIES TO FIRE WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p1212

FAN RUNS CONTINUOUSLY BUT BOILER DOES NOT ATTEMPT TO FIRE

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p917

FAULT CODE SHOWN

CHARACTERISTIC TEST FROM OBSERVATION LED ILLUMINATED

Next: p99

24/09/2018 13:58:48 1808_1_50_1 24/10/2018 08:08:50

24/09/2018 15:30:14

Next: End

INSPECTION VENT TUBE GAS VALVE

Next: p1034, !f1047

RESISTANCE MODUREG

REMOVE BOTH WIRES FROM THE MODUREG

Next: !p1039, !f1040

INSPECTION VENT TUBE GAS VALVE

Next: p1072, !f1073

RESISTANCE MODUREG

REMOVE BOTH WIRES FROM THE MODUREG

Next: !p1078, !f1079

RESISTANCE LOW PRESSURE SWITCH

REMOVE THE TWO WIRES FROM THE LOW WATER PRESSURE SWITCH MAKING A NOTE OF THEIR LOCATIONS

Next: !p1102, f1103

INSPECTION LOW PRESSURE SWITCH AND CONNECTION

APPLIANCE DRAINED AND DISCHARGED
REMOVE THE LOW WATER PRESSURE SWITCH

Next: !p1104, ?1105, ?1107

RESISTANCE APS AND HARNESS USING TEST KIT

REMOVE CONNECTOR M5 FROM THE PCB
REMOVE TUBE FROM FRONT CONNECTOR OF APS

Next: p1189, f1186

RESISTANCE APS USING TEST KIT

DISCONNECT LEADS FRO

Next: !p1187, !f1188

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1195, f1196

RESISTANCE THERMISTOR PRIMARY

REMOVE THE CONNECTOR

Next: !p1197, !f1198

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p1201, !f1202

OBSERVATION ISOLATE WATER SUPPLY TO BOILER

ISOLATE THE DHW SUPPLY TO THE APPLIANCE

Next: p1217, !f1218

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p1228, !f1229

INSPECTION SYSTEM PRESSURE AND AIR

Next: p1261, !f1236

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p1239, f1240

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p1241, !f1242

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p1294, f1449

INSPECTION VENT TUBE GAS VALVE

Next: p1321, !f1308

RESISTANCE MODUREG

REMOVE BOTH WIRES FROM THE MODUREG

Next: !p1313, !f1314

RESISTANCE DHW MICROSWITCH AND HARNESS PUMP NOT RUNNING

REMOVE CONNECTOR M5 FROM THE PCB

Next: p1360, f1361

RESISTANCE DHW MICROSWITCH

DISCONNECT THE INLIN

Next: !p1362, !f1363

RESISTANCE LOW PRESSURE SWITCH

REMOVE THE TWO WIRES FROM THE LOW WATER PRESSURE SWITCH MAKING A NOTE OF THEIR LOCATIONS

Next: !p1378, f1379

INSPECTION LOW PRESSURE SWITCH AND CONNECTION

APPLIANCE DRAINED AND DISCHARGED
REMOVE THE LOW WATER PRESSURE SWITCH

Next: !p1380, ?1381, ?1383

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p1401, !f1402

INSPECTION CONDENSING HEAT EXCHANGER WATERWAYS

DRAIN PRIMARY CIRCUIT OF WATER
REMOVE FLOW AND RETURN PIPES TO CONDENSING HEAT EXCHANGER

Next: !p1444, !f1445

INSPECTION CONDENSING HEAT EXCHANGER WATERWAYS

DRAIN PRIMARY CIRCUIT OF WATER
REMOVE FLOW AND RETURN PIPES TO CONDENSING HEAT EXCHANGER

Next: !p1450, !f1451

INSPECTION INTEGRAL BYPASS

APPLIANCE DRAINED AN

Next: !p1460, !f1461

INSPECTION CONDENSATE PIPE

Next: p1469, !f1470

VOLTAGE FAN AT FAN

Next: !p210, f211

VOLTAGE FAN AT PCB

{GAINPCBACS}

Next: !p212, f213

RESISTANCE AIR PRESSURE SWITCH AND HARNESS AT REST

REMOVE CONNECTOR M5 FROM THE PCB

Next: p1386, f215

RESISTANCE AIR PRESSURE SWITCH AT REST

REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: !p218, f219

RESISTANCE APS TUBE DISCONNECTED

DISCONNECT AIR PRESSURE PIPE FROM APS

Next: p220, !f221

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p355, ?356, ?358

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p364, !f365

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p383, ?384, ?386

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p392, !f393

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO PCB

Next: p425, !f436

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p428, f429

OBSERVATION DISCONNECT DHW MICROSWITCH

REMOVE THE DHW MICRO

Next: p1354, f1359

INSPECTION DHW TEMPERATURE CONTROL KNOB

GAIN ACCESS TO PCB

Next: p1056, !f443

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p455, !f456

TEMPERATURE HEATING FLOW INCREASE - INTERNAL DHW ISOLATED

ISOLATE COLD WATER S

Next: !p488, !f489

INSPECTION SYSTEM PRESSURE FOR FAULT CODE

Next: p513, ?515, ?517, ?520

RESISTANCE LOW PRESSURE SWITCH

REMOVE THE TWO WIRES FROM THE LOW WATER PRESSURE SWITCH MAKING A NOTE OF THEIR LOCATIONS

Next: !p524, f831

OBSERVATION FAN RUNS

Next: p621, f601

VOLTAGE FAN AT FAN

Next: !p602, f603

VOLTAGE FAN AT PCB

{GAINPCBACS}

Next: !p604, f605

RESISTANCE AIR PRESSURE SWITCH AND HARNESS AT REST

REMOVE CONNECTOR M5 FROM THE PCB

Next: !p657, f607

RESISTANCE AIR PRESSURE SWITCH AT REST

REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: !p608, f609

RESISTANCE APS TUBE DISCONNECTED

DISCONNECT AIR PRESSURE PIPE FROM APS

Next: p610, !f611

RESISTANCE APS USING TEST KIT

DISCONNECT LEADS FRO

Next: !p624, !f625

OBSERVATION BOILER RESET OVERHEAT FAULT

ENSURE APPLIANCE IS COOL (BELOW 40°C)

Next: p696, ?807, ?809

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p701, f702

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p703, !f704

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: !p711, f1443

RESISTANCE PUMP AND HARNESS AND TO EARTH

REMOVE CONNECTOR M12 FROM THE PCB

Next: p722, f725

RESISTANCE PUMP AND TO EARTH

REMOVE THE COVER FROM THE PUMP ASSEMBLY
REMOVE THE WIRES FROM THE PUMP ASSEMBLY

Next: !p732, !f733

RESISTANCE FAN AND TO EARTH

REMOVE THE WIRES FROM THE FAN ASSEMBLY

Next: !p730, !f731

RESISTANCE OVERHEAT STATS AND HARNESS

REMOVE CONNECTOR M7 FROM THE PCB

Next: p777, f778

RESISTANCE OVERHEAT STAT

REMOVE BOTH WIRES FROM THE OVERHEAT THERMOSTAT

Next: p1425, !f780

RESISTANCE OVERHEAT STAT

REMOVE BOTH WIRES FROM THE OVERHEAT THERMOSTAT

Next: p1480, !f815

RESISTANCE AIR PRESSURE SWITCH AT REST

REMOVE THE WIRES FROM THE AIR PRESSURE SWITCH NOTING THEIR LOCATIONS

Next: !p819, f820

RESISTANCE APS TUBE DISCONNECTED

DISCONNECT AIR PRESSURE PIPE FROM APS

Next: p821, !f822

INSPECTION LOW PRESSURE SWITCH AND CONNECTION

APPLIANCE DRAINED AND DISCHARGED
REMOVE THE LOW WATER PRESSURE SWITCH

Next: !p832, ?833, ?835

VOLTAGE MAINS INTO APPLIANCE

Next: p852, f853

RESISTANCE FUSE MAIN

GAIN ACCESS TO THE INCOMING MAINS FUSE

Next: !p854, f855

FUSE FURTHER INVESTIGATION MAIN

Next: !p953, !f857

FUSE FURTHER INVESTIGATION F2A

Next: !p860, !f861

INSPECTION DHW ISOLATION VALVE

Next: p88, !f89

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1092, !f1502

INSPECTION VENT TUBE GAS VALVE

Next: p984, !f991

INSPECTION VENT TUBE GAS VALVE

Next: p995, !f994

INSPECTION VENT TUBE GAS VALVE

Next: p746, !f1008

INSPECTION VENT TUBE GAS VALVE

Next: p742, !f1015

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE C

Next: p709, !f1027

PRESSURE GAS INLET BURNER ESTABLISHED

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p1035, !f1036

RESISTANCE MODUREG AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1037, f1038

VOLTAGE MODUREG

HOT WATER TAP ON AND FULLY OPEN

Next: p1041, !f1042

PRESSURE GAS MAXIMUM ADJUSTMENT

ATTACH U GAUGE TO BU

Next: p1043, !f1044

CORRECTION GAS VALVE MAXIMUM

Next: !p1045, !f1046

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1057, !f1510

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p1059, !f1060

RESISTANCE HARNESS GAS VALVE TO EARTH

ENSURE GAS VALVE CONNECTOR IS RE ATTACHED TO GAS VALVE
REMOVE CONNECTOR M7 FROM THE PCB

Next: !p1062, !f1063

RESISTANCE HARNESS GAS VALVE TO EARTH

ENSURE GAS VALVE CONNECTOR IS RE ATTACHED TO GAS VALVE
REMOVE CONNECTOR M7 FROM THE PCB

Next: !p1065, !f1066

PRESSURE BURNER MAXIMUM

ATTACH U GAUGE TO BU

Next: p1087, f1071

PRESSURE GAS INLET BURNER ESTABLISHED

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p1074, !f1075

RESISTANCE MODUREG AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1076, f1077

VOLTAGE MODUREG

HOT WATER TAP ON AND FULLY OPEN

Next: p1080, !f1081

PRESSURE GAS MAXIMUM ADJUSTMENT

ATTACH U GAUGE TO BU

Next: p1082, !f1083

CORRECTION GAS VALVE MAXIMUM

Next: !p1084, !f1085

INSPECTION BURNER ASSEMBLY

GAIN ACCESS TO BURNER ASSEMBLY

Next: p1088, !f1089

INSPECTION PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p1431, !f1091

INSPECTION SYSTEM PRESSURE NO RESPONSE

Next: p1093, ?1094, ?1096, ?1098

RESISTANCE LOW PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR M4 FROM THE PCB

Next: !p1100, f1101

INSPECTION FILTER

ISOLATE INCOMING WATER SUPPLY TO APPLIANCE

Next: !p1457, !f1458

OBSERVATION SPARKING OCCUR WITH APS MADE

REMOVE TUBE FROM FRONT CONNECTOR OF APS

Next: p1178, f1185

INSPECTION AIR PRESSURE TUBE

Next: p1179, !f1180

INSPECTION AIR PRESSURE PIPE

REMOVE THE INNER COM

Next: p1434, !f1182

INSPECTION FLUE

Next: !p1183, !f1184

INSPECTION SPARK ELECTRODES

REMOVE THE SPARK ELECTRODE LEADS FROM THE SPARK ELECTRODES

Next: p1190, !f1191

RESISTANCE ELECTRODE LEADS

DISCONNECT THE ELECTRODE LEADS FROM THE SPARK ELECTRODES AND THE SPARK GENERATOR ON THE PCB

Next: !p1192, !f1193

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1204, f1200

OBSERVATION BOILER RESET THERMISTOR FAULT CODE

NO DEMANDS
SELECT

Next: p1205, !f1208

OBSERVATION RUN APPLIANCE DOES FAULT CODE RETURN

Next: !p1211, !f1210

OBSERVATION DISCONNECT EXTERNAL CONTROLS OR LINK

REMOVE THE WIRING TO

Next: p1213, !f1214

RESISTANCE DHW MICROSWITCH AND HARNESS

REMOVE CONNECTOR M5 FROM THE PCB

Next: p1222, f1216

RESISTANCE DHW MICROSWITCH

DISCONNECT THE INLIN

Next: !p1219, !f1220

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1223, !f1503

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1230, f1227

TEMPERATURE APPLIANCE

Next: !p1232, !f1231

OBSERVATION PUMP RUNS

Next: p1237, f1238

PUMP LIMPET

Next: p1289, !f1244

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1235, !f1513

EXTERNAL BYPASS

Next: p1290, !f1291

TEMPERATURE DIFFERENTIAL DHW

FLOW RATE AT HOT TAP

Next: p1292, f1293

TEMPERATURE DIFFERENTIAL CH - RAPID TEMP RISE

ATTACH TEMPERATURE C

Next: !p1304, !f1297

PRESSURE GAS INLET BURNER ESTABLISHED

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p1309, !f1310

RESISTANCE MODUREG AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1311, f1312

VOLTAGE MODUREG

HOT WATER TAP ON AND FULLY OPEN

Next: p1315, !f1316

PRESSURE GAS MAXIMUM ADJUSTMENT

ATTACH U GAUGE TO BU

Next: p1317, !f1318

CORRECTION GAS VALVE MAXIMUM - PRIMARY TEST

Next: !p1319, !f1320

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1335, !f1509

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: p1307, !f1350

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p1352, !f1353

INSPECTION DIVERTER MOVEMENT

REMOVE THE MICROSWITCH FROM THE TOP OF THE DIVERTER VALVE AND PLACE IN A SAFE POSITION.

Next: !p1358, !f1355

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1364, !f1505

INSPECTION SYSTEM PRESSURE FOR PUMP NOT RUNNING

Next: p1368, ?1370, ?1372, ?1374

RESISTANCE LOW PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR M4 FROM THE PCB

Next: !p1376, f1377

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p1398, !f1506

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: !p1399, f1400

RESISTANCE FLUE LIMIT STAT

FOR ACCESS TO FLUE LIMIT STAT, REMOVE FAN ASSEMBLY
REMOVE BOTH WIRES FROM THE THERMOSTAT

Next: !p1426, !f1427

INSPECTION HEAT EXCHANGER CONDENSING FLUE WAYS

REMOVE FAN ASSEMBLY FROM BOILER

Next: !p1429, !f1430

INSPECTION HEAT EXCHANGER CONDENSING FLUE WAYS

REMOVE FAN ASSEMBLY FROM BOILER

Next: !p1432, !f1433

INSPECTION HEAT EXCHANGER CONDENSING FLUE WAYS

REMOVE FAN ASSEMBLY FROM BOILER

Next: p1181, !f1438

INSPECTION CONDENSING HEAT EXCHANGER WATERWAYS

DRAIN PRIMARY CIRCUIT OF WATER
REMOVE FLOW AND RETURN PIPES TO CONDENSING HEAT EXCHANGER

Next: !p1440, !f1442

INSPECTION CONDENSING HEAT EXCHANGER WATERWAYS

DRAIN PRIMARY CIRCUIT OF WATER
REMOVE FLOW AND RETURN PIPES TO CONDENSING HEAT EXCHANGER

Next: !p1447, !f1448

OBSERVATION CONDENSATE LEVEL SENSOR DISCONNECTED

REMOVE WIRES FROM CONDENSATE LEVEL SENSOR

Next: p282, f1468

INSPECTION HEAT EXCHANGER CONDENSING

REMOVE FAN ASSEMBLY

Next: !p1471, !f1472

RESISTANCE OVERHEAT STAT

REMOVE BOTH WIRES FROM THE OVERHEAT THERMOSTAT

Next: !p1478, !f1479

RESISTANCE FLUE LIMIT STAT

FOR ACCESS TO FLUE LIMIT STAT, REMOVE FAN ASSEMBLY
REMOVE BOTH WIRES FROM THE THERMOSTAT

Next: !p1481, !f1482

INSPECTION FLUE LIMIT THERMOSTAT

Next: p789, !f1489

INSPECTION HEAT EXCHANGER CONDENSING FLUE WAYS

REMOVE FAN ASSEMBLY FROM BOILER

Next: p646, !f1518

INSPECTION AIR PRESSURE TUBE

Next: !p222, !f223

PRESSURE BURNER IGNITION

ATTACH U GAUGE TO THE BURNER PRESSURE TEST POINT
REMOVE 1 WIRE FROM MODUREG AND MAKE SAFE

Next: p255, ?256, ?258

PRESSURE BURNER IGNITION

ATTACH U GAUGE TO THE BURNER PRESSURE TEST POINT
REMOVE 1 WIRE FROM MODUREG AND MAKE SAFE

Next: p1462, f983

INSPECTION BURNER ASSEMBLY

GAIN ACCESS TO BURNER ASSEMBLY

Next: p293, !f302

INSPECTION SPARK ELECTRODE ALIGNMENT

Next: p272, !f273

PRESSURE GAS INLET

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p774, !f265

PRESSURE GAS INLET

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p735, !f263

INSPECTION BURNER ASSEMBLY

GAIN ACCESS TO BURNER ASSEMBLY

Next: !p275, !f276

INSPECTION ELECTRODE DETECTION AND LEAD

DISCONNECT THE INLINE CONNECTOR ON THE DETECTION LEAD

Next: p283, !f284

RESISTANCE DETECTION LEAD SECTION 2

REMOVE CONNECTOR M10 FROM PCB

Next: !p285, !f286

INSPECTION PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p1428, !f303

PRESSURE BURNER IGNITION

ATTACH U GAUGE TO THE BURNER PRESSURE TEST POINT
REMOVE 1 WIRE FROM MODUREG AND MAKE SAFE

Next: p234, f992

PRESSURE GAS INLET BURNER ESTABLISHED

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p1009, !f310

INSPECTION DHW TEMPERATURE CONTROL KNOB

GAIN ACCESS TO PCB

Next: p333, !f373

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p334, !f1507

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: p335, !f344

PUMP LIMPET

Next: p336, !f345

TEMPERATURE DIFFERENTIAL DHW

FLOW RATE AT HOT TAP

Next: p934, f346

OBSERVATION LINK EXTERNAL CONTROLS

REMOVE THE EXTERNAL

Next: p360, !f361

OBSERVATION TIMER FITTED

Next: p362, f363

RESISTANCE INTEGRAL TIMER

REMOVE THE WIRES FROM TERMINALS 3 AND 4 ON THE INTEGRAL TIMER

Next: p366, !f367

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p371, !f372

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p375, !f1508

RESISTANCE THERMISTOR DHW

REMOVE CONNECTOR FROM DHW THERMISTOR

Next: p377, !f378

PUMP LIMPET

Next: p379, !f380

TEMPERATURE DIFFERENTIAL DHW

FLOW RATE AT HOT TAP

Next: !p401, f382

OBSERVATION LINK EXTERNAL CONTROLS

REMOVE THE EXTERNAL

Next: p388, !f389

OBSERVATION TIMER FITTED

Next: p390, f391

RESISTANCE INTEGRAL TIMER

REMOVE THE WIRES FROM TERMINALS 3 AND 4 ON THE INTEGRAL TIMER

Next: p394, !f395

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p396, !f397

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO PCB

Next: p837, !f423

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP ASSEMBLY

Next: !p426, f427

PRESSURE EXPANSION VESSEL

APPLIANCE PRIMARY CIRCUIT DRAINED AND DISCHARGED

Next: !p461, !f462

INSPECTION CH TEMPERATURE CONTROL KNOB

GAIN ACCESS TO PCB

Next: p463, !f464

OBSERVATION LINK EXTERNAL CONTROLS

REMOVE THE EXTERNAL

Next: p451, !f452

OBSERVATION TIMER FITTED

Next: p453, f454

RESISTANCE INTEGRAL TIMER

REMOVE THE WIRES FROM TERMINALS 3 AND 4 ON THE INTEGRAL TIMER

Next: p457, !f458

RESISTANCE EXTERNAL CONTROLS HARNESS

REMOVE CONNECTOR M1 FROM THE PCB

Next: !p459, !f460

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: !p465, !f1511

PUMP LIMPET

Next: p483, !f482

TEMPERATURE HEATING FLOW INCREASE - INTERNAL

ATTACH ONE TEMPERATU

Next: p480, f481

TEMPERATURE DIFFERENTIAL FLOW PIPE EXTERNAL AND RETURN

ATTACH 1 TEMPERATURE

Next: !p490, f1459

EXTERNAL BYPASS

Next: p479, !f487

RESISTANCE LOW PRESSURE SWITCH AND HARNESS

REMOVE CONNECTOR M4 FROM THE PCB

Next: !p522, f523

INSPECTION SYSTEM PRESSURE AND AIR

Next: p314, !f555

INSPECTION SYSTEM PRESSURE AND AIR

Next: p374, !f582

INSPECTION SYSTEM PRESSURE AND AIR

Next: p792, !f597

INSPECTION AIR PRESSURE TUBE

Next: !p612, !f613

RESISTANCE APS AND HARNESS USING TEST KIT

REMOVE CONNECTOR M5 FROM THE PCB
REMOVE TUBE FROM FRONT CONNECTOR OF APS

Next: p643, f623

INSPECTION AIR PRESSURE TUBE

Next: p644, !f645

INSPECTION AIR PRESSURE PIPE

REMOVE THE INNER COM

Next: p1514, !f647

INSPECTION FLUE

Next: !p648, !f649

INSPECTION SYSTEM PRESSURE AND AIR

Next: p697, !f698

OBSERVATION PUMP RUNS

Next: p699, f700

PUMP LIMPET

Next: p705, !f706

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: p760, !f1512

TEMPERATURE DIFFERENTIAL DHW

FLOW RATE AT HOT TAP

Next: p1020, f710

OBSERVATION RUN APPLIANCE TO MAX TEMP

BOILER CH THERMOSTAT

Next: !p1477, ?715, ?717

RESISTANCE FAN AND HARNESS AND TO EARTH

REMOVE CONNECTOR M13 FROM THE PCB

Next: p723, f726

RESISTANCE GAS VALVE

REMOVE LEAD FROM GAS VALVE

Next: p1483, !f727

PRESSURE GAS MINIMUM ADJUSTMENT NOT IGNITING

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE
ATTACH U GAUGE TO BURNER PRESSURE TEST POINT

Next: p954, !f955

PRESSURE GAS MINIMUM ADJUSTMENT

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE
ATTACH U GAUGE TO BURNER PRESSURE TEST POINT

Next: p970, !f971

PRESSURE GAS MINIMUM ADJUSTMENT

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE
ATTACH U GAUGE TO BURNER PRESSURE TEST POINT

Next: p966, !f967

EXTERNAL BYPASS

Next: p707, !f772

VOLTAGE AC TO GAS VALVE AT PCB

{GAINPCBACS}

Next: p783, f776

RESISTANCE GAS VALVE

REMOVE LEAD FROM GAS VALVE

Next: p786, !f782

DIODE TEST HARNESS GAS VALVE

REMOVE THE CONNECTOR

Next: !p784, !f785

DIODE TEST HARNESS GAS VALVE

REMOVE THE CONNECTOR

Next: p1061, !f827

DIODE TEST HARNESS GAS VALVE

REMOVE THE CONNECTOR

Next: p1064, !f791

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p478, !f806

RESISTANCE OVERHEAT STATS AND HARNESS

REMOVE CONNECTOR M7 FROM THE PCB

Next: !p812, f813

RESISTANCE AIR PRESSURE SWITCH AND HARNESS AT REST

REMOVE CONNECTOR M5 FROM THE PCB

Next: !p817, f818

INSPECTION AIR PRESSURE TUBE

Next: !p823, !f824

VOLTAGE MAINS INTO APPLIANCE AT PCB

Next: p864, f851

RESISTANCE FUSE F2A

REMOVE THE FUSE FROM THE INCOMING MAINS TERMINAL STRIP

Next: !p867, f859

OBSERVATION DOES BOILER RESPOND

Next: p868, f873

FURTHER INVESTIGATION LED FAULTY

TESTS SO FAR HAVE PR

Next: !p870, !f871

OBSERVATION WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p1163, !f91

RESISTANCE THERMISTOR PRIMARY AND HARNESS

REMOVE CONNECTOR M6 FROM THE PCB

Next: !p918, !f1504

PRESSURE BURNER MAXIMUM

ATTACH U GAUGE TO BU

Next: !p950, f1033

CORRECTION GAS VALVE MINIMUM - BURNER NOT IGNITING

Next: !p956, !f957

CORRECTION GAS VALVE MINIMUM - MINIMUM TOO HIGH

Next: !p968, !f969

CORRECTION GAS VALVE MINIMUM - MINIMUM TOO LOW

Next: !p972, !f973

INSPECTION VENT TUBE GAS VALVE

Next: p259, !f982

PRESSURE GAS INLET

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p985, !f986

PRESSURE GAS MINIMUM ADJUSTMENT NOT ESTABLISHING

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE
ATTACH U GAUGE TO BURNER PRESSURE TEST POINT

Next: p987, !f988

CORRECTION GAS VALVE MINIMUM - BURNER IGNITES BUT DOES NOT ESTABLISH

Next: !p989, !f990

FAULT CODES

Next: !p117, !f118

PRESSURE GAS INLET

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p996, !f997

PRESSURE GAS MINIMUM ADJUSTMENT

REMOVE 1 WIRE FROM THE MODUREG AND MAKE SAFE
ATTACH U GAUGE TO BURNER PRESSURE TEST POINT

Next: p998, !f999

CORRECTION GAS VALVE MINIMUM - BURNER IGNITES BUT BAFFLES

Next: !p1000, !f1001

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