XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

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

Start Diagnostic Sequence

or choose a specific test below:

IDEAL CODE COMBI (3 SENSORS)

GLOBALLY REPLACED

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &3, !f1228

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f1227

POWER ON SELF TEST

{ALLDEMANDOFF}
PR

Next: &27, ?106, ?129, ?131, ?521, ?940

DHW FLOW RATE

Next: &39, f28

PUMP AND FAN RUN DHW DEMAND

SELECTOR SWITCH TO HOT WATER POSITION
DHW TEMPERATURE CONTROL SET TO MAX
PREHEAT OFF

Next: &284, ?960, ?962

HOT WATER OPERATION

PREHEAT OFF

Next: &1212, ?194, ?196, ?198, ?200, ?202

BURNER IGNITES AND ESTABLISHES DHW DEMAND

DHW TEMPERATURE CONTROL SET TO MAX
PREHEAT OFF
ENSURE SELECTOR SWITCH IS IN HOT WATER POSITION

Next: &193, ?287, ?289, ?291, ?293

HEATING OPERATION

PREHEAT OFF
ENSURE THE HEATING FLOW AND RETURN VALVES ARE FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: &958, ?634, ?636, ?638, ?642, ?644

PUMP AND FAN OVER RUN

PREHEAT OFF
APPLY A DEMAND FOR HEATING OR HOT WATER

Next: &nff, !f959

OPERATIONAL SEQUENCE

NO LONGER USED

Next: &nff, !f1084

FAULT CODES

Next: &nff, !f1086

F1

OK TO BE BLANK

Next: &nff, f1137

F4

OK TO BE BLANK

Next: &nff, f1146

F5

OK TO BE BLANK

Next: &nff, f1151

C2 BCC ERROR

OK TO BE BLANK

Next: &nff, f1206

FAN RUNS CH DEMAND

PREHEAT OFF
SELECTOR SWITCH TO HEATING AND HOT WATER POSITION

Next: &633, f2439

FURTHER INVESTIGATION FUSES

OK TO BE BLANK

Next: &nff, f1884

F7

OK TO BE BLANK

Next: &nff, f1451

L5

OK TO BE BLANK

Next: &nff, f1455

FA

OK TO BE BLANK

Next: &nff, f1463

F2

OK TO BE BLANK

Next: &nff, f2095

L6

Next: &nff, f2487

HEADER FOR FAULT CODE L1 AND L3

HEADER FOR FAULT CODE L1 AND L3 - INTENTIONALLY BLANK

Next: &nff, f2497

OPERATION CH OK NO REFIRE

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

OPERATION CH OK NO REFIRE

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PREHEAT SATISFACTORY3

PCB - PRIMARY

Next: End

TO LOW WATER PRESSURE SWITCH

HARNESS - LOW VOLTAGE

Next: End

LOW WATER ON START UP

TRANSDUCER - WATER PRESSURE (BLOCKED)

Next: End

OPS SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

TO LWPS F1 - LOW WATER FAULT

HARNESS - LOW VOLTAGE

Next: End

F1 - LOW WATER FAULT

TRANSDUCER - WATER PRESSURE

Next: End

F4 - FLOW SENSOR FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

F5 - RETURN SENSOR FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

NOT RESPONDING TO HEATING - LINKEDPUMP SU FAN RUNS SPARKING DOES NOT OCCUR

PCB - PRIMARY

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCURTEMP

PCB - PRIMARY

Next: End

C2 BCC ERROR

PCB - PRIMARY

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

TO FAN POWER - PUMP SHORT TIME START UP

HARNESS - MAINS VOLTAGE

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE - PCB

Next: End

TO DIVERTER - RADS NOT POOR HOT WATER

HARNESS - MAINS VOLTAGE

Next: End

BOILER TO TEMP RADS COOL

KIT - PUMP HEAD

Next: End

DHW DEMAND STOPS QUICKLY

KIT - PUMP HEAD

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

DHW NOISEY KETTLING

KIT - SIPHON TRAP

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BURNERIGNITES

HARNESS - DETECTION LEAD

Next: End

PUMP NOT RUNNING AT START UP

KIT - PUMP HEAD

Next: End

NO FAN AT START UP

PCB - PRIMARY

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CONDENSATE PIPE

Next: End

RADS COLD BOILER HOT

CARTRIDGE - DIVERTER VALVE

Next: End

RADS COLD BOILER HOT

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT

HARNESS - MAINS VOLTAGE

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILER HOT RADS COLD

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILER HOT RADS COLD

KIT - CUI BOARD

Next: End

POOR VOLTAGE

Next: End

WONT RESET L5

PCB - PRIMARY

Next: End

FA

KIT - PUMP HEAD

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

FAULT CODE FA

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PCB DAMAGED

PCB - PRIMARY AND LEAK OR SHORT

Next: End

FLOW RATE

COLD WATER SUPPLY

Next: End

BURNER BAFFLES OR NOISY

INJECTOR ASSEMBLY

Next: End

NEW MODELBLOCKED OR DAMAGED

KIT - BURNER

Next: End

SPARKING BUT NO LIGHTING

KIT - HEAT ENGINE

Next: End

SPARK BUT NOT LIGHTING

FLUE

Next: End

BURNER DOES NOT IGNITE

KIT - SIPHON TRAP

Next: End

TO GAS VALVE - NO POWER ON IGN

HARNESS - MAINS VOLTAGE

Next: End

NOT OPENING - MECHANICAL

KIT - GAS VALVE

Next: End

BURNER DOES NOT IGNITE

INJECTOR ASSEMBLY

Next: End

BURNER DOES NOT IGNITE

KIT - BURNER

Next: End

BURNER DOES NOT IGNITE

KIT - HEAT ENGINE

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

SENSOR TEMP RETURN FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

DHW POT FAULTY

KIT - CUI BOARD

Next: End

CALIBRATION LOW BOILER TEMP LOW OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

DHW COOL RADS COOL

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILER TEMP LOW SYSTEM TEMP LOWOPERATION DHW DHW COOL RADS COOL

GAS PRESSURE INLET

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

INJECTOR ASSEMBLY

Next: End

RESTICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

CONDENSATE PIPE

Next: End

RESTRICTED OPERATION DHW DHW DOOL RADS COLD NO CH DEMAND

KIT - HEAT ENGINE

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

FLUE

Next: End

LOW SYSTEM TEMP POTOPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - CUI BOARD

Next: End

FAN DOES NOT RUN

HARNESS - MAINS VOLTAGE

Next: End

IGNITES BUT BAFFLES OR NOISY

KIT - BURNER

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

FAULT CODE FA

KIT - FLOW GROUP

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - PUMP HEAD

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - FAN

Next: End

FURTHER INVESTIGATION FUSE F1

VALVE HEAD - DIVERTER

Next: End

FURTHER INVESTIGATION FUSE F1

KIT - GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

UNIT - IGNITOR

Next: End

FUSE FURTHER INVESTIGATION

VALVE HEAD DIVERTER - CARTRIDGE DIVERTER

Next: End

F1 - LOW WATER FAULT

SYSTEM PRESSURE

Next: End

F1 LOW WATER FAULT

KIT - PRESSURE GAUGE

Next: End

POOR GAS RATE

KIT - BURNER

Next: End

DHW OPERATION BOILER NOISY

KIT - PUMP HEAD

Next: End

DHW OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

KIT - PUMP HEAD

Next: End

CH OPERATION BOILER NOISY

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

LOW GAS RATE CH OPERATION

INJECTOR ASSEMBLY

Next: End

VOLTS TO TURBINE (DHW BURNER IGN) 2

PCB - PRIMARY

Next: End

TO FLOW SWITCH - NO HOT WATER DEMAND

HARNESS - LOW VOLTAGE

Next: End

FAN DOES NOT RUN

FLOW TURBINE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

PCB - PRIMARY

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS - MAINS VOLTAGE

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

LEAD - IGNITION

Next: End

F2 FAULT CODE

GAS PRESSURE INLET

Next: End

F2 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

F2 FAULT CODE

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

KIT - BURNER

Next: End

F2 FAULT CODE

ELECTRODE - DETECTION

Next: End

F2 FAULT CODE

KIT - SIPHON TRAP

Next: End

F2 FAULT CODE

KIT - BURNER

Next: End

PUMP ONLY RUNS FOR A FEW SECS

KIT - PRESSURE GAUGE

Next: End

F2 FAULT CODE

ELECTRODE - IGNITION

Next: End

F2 FAULT CODE

KIT - HEAT ENGINE

Next: End

F2 FAULT CODE

INJECTOR ASSEMBLY

Next: End

F2 FAULT CODE

KIT - GAS VALVE

Next: End

MECHANICAL OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - FAN

Next: End

GAS VALVE FILTER RESTRICTED

KIT - GAS VALVE

Next: End

BURNER IGNITES

ELECTRODE - DETECTION

Next: End

GAS VALVE INLET FILTER RESTRICTED

KIT - GAS VALVE

Next: End

NOT RESPONDING TO CH 1

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 2

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 5

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 6

KIT - CUI BOARD

Next: End

NO CH DEMAND

INTERNAL TIMER

Next: End

NO CH DEMAND 2

INTERNAL TIMER

Next: End

NOT RESPONDING TO HEATING 1

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 7

KIT - CUI BOARD

Next: End

NO CH DEMAND 2

PLUG - TIMER LINK

Next: End

NO CH DEMAND

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH

KIT - CUI BOARD

Next: End

DOES NOT ESTABLISH

ELECTRODE - IGNITION

Next: End

FAN RUNS DHW DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

PREHEAT SATISFACTORY3

CARTRIDGE - DIVERTER VALVE

Next: End

DHW COOL RADS COOL

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

NO CH DEMAND 1

PLUG - TIMER LINK

Next: End

NOT RESPONDING TO HEATING 2

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 8

KIT - CUI BOARD

Next: End

NO CH DEMAND 1

INTERNAL TIMER

Next: End

NOT RESPONDING TO CH 3

KIT - CUI BOARD

Next: End

NOT RESPONDING TO CH 4

KIT - CUI BOARD

Next: End

FAN RUNS CH DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

CH BOILER TEMP LOW SYSTEM TEMP LOW

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

BOILER FIRES WITH NO DEMAND

KNOB - WHITE / GREY - POTENTIOMETERS

Next: End

L6 FAULT CODE

HARNESS - DETECTION LEAD

Next: End

L6 FAULT CODE

ELECTRODE - DETECTION

Next: End

L6 - STICKING OPEN

KIT - GAS VALVE

Next: End

L6 FAULT CODE

PCB - PRIMARY

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

L1 - OVERHEAT FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

OUT OF CALIBRATION OVERHEAT (WONT RESET)

THERMISTOR - NO FLOW

Next: End

BLANK FOR L1 FAULT CODE 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE L3

SYSTEM PRESSURE

Next: End

L3 NO WATER FLOW

KIT - PRESSURE GAUGE

Next: End

L1 OR L3 FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

L1 OR L3 FAULT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

OUT OF CALIBRATION OVERHEAT

THERMISTOR - NO FLOW

Next: End

PREHEAT SATISFACTORY4

PCB - PRIMARY

Next: End

TO DIVERTER - RADS NOT POOR HOT WATER2

HARNESS - MAINS VOLTAGE

Next: End

RADS COLD BOILER HOT 2

PCB - PRIMARY

Next: End

RADS COLD BOILER HOT2

HARNESS - MAINS VOLTAGE

Next: End

FAULT CODE L3

CARTRIDGE - DIVERTER VALVE

Next: End

TO PUMP F0-L3 - NO FLOW FAULT

HARNESS - MAINS VOLTAGE

Next: End

FO-L3 - NO FLOW FAULT - STICKING

KIT - PUMP HEAD

Next: End

FAULT CODE L3

KIT - HEAT ENGINE

Next: End

POOR FLOW RATE

PACK - DHW

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

TO SPARK GEN - NO SPARK

HARNESS - MAINS VOLTAGE

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

PCB - PRIMARY

Next: End

NOT SPARKING

LEAD - IGNITION

Next: End

LOW AT START UP

SYSTEM PRESSURE

Next: End

MECHANICAL PHYSICAL OPERATION

KIT - FAN

Next: End

NEW MODEL FLUEWAYS

KIT - HEAT ENGINE

Next: End

UNDER PRESSURE

KIT - EXPANSION VESSEL

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS PRESSURE INLET

Next: End

HOT WATER CYCLING

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

HOT WATER CYCLING

KIT - PLATE HEAT EXCHANGER

Next: End

TEMPERATURE CONTROL DHW

KIT - CUI BOARD

Next: End

OPERATION CH TOO LONG FOR REFIRECIRCULATION

Next: End

BLOCKED PREHEAT SAT3

KIT - PLATE HEAT EXCHANGER

Next: End

NO DISPLAY AT START UP

HARNESS - CUI TO PRIMARY

Next: End

HOT WATER CYCLING

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

NO FAN AT START UP

HARNESS - LOW VOLTAGE

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

ON WITH NO DEMAND - FROST

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

EXTERNAL FROST PROTECT

EXTERNAL FROST PROTECT

Next: End

NO OVERRUNS

PCB - PRIMARY

Next: End

TO PUMP - NO POWER AT PUMP

HARNESS - MAINS VOLTAGE

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

HOT WATER TOO HOT

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

PREHEAT SATISFACTORY3

VALVE HEAD - DIVERTER

Next: End

LOW WATER FAULT

PCB - PRIMARY

Next: End

LOW WATER ON START UP

TRANSDUCER - WATER PRESSURE

Next: End

F1 - LOW WATER FAULT

PCB - PRIMARY

Next: End

F1 - LOW WATER FAULT

TRANSDUCER - WATER PRESSURE (BLOCKED)

Next: End

TO FLOW SENSOR F4 - FLOW SENSOR FAULT

HARNESS - LOW VOLTAGE

Next: End

F4 - FLOW SENSOR FAULT

PCB - PRIMARY

Next: End

TO RETURN SENSOR F5 - RETURN SENSOR FAULT

HARNESS - LOW VOLTAGE

Next: End

F5 - RETURN SENSOR FAULT

PCB - PRIMARY

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB - PRIMARY

Next: End

C2 BCC ERROR

Z DIRECTION CHOICE OR CONTINUE

Next: End

NO MAINS TO FAN AT START UP

PCB - PRIMARY

Next: End

ELECTRICAL OVER 15V ON N

KIT - FAN

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

SUPPLY FAULT AT POWER UP

Next: End

TO PUMP - NO POWER AT START UP

HARNESS - MAINS VOLTAGE

Next: End

IMPELLERTEMP

KIT - PUMP HEAD (IMPELLER)

Next: End

DHW NOISY KETTLING

KIT - PLATE HEAT EXCHANGER

Next: End

CH OPERATION NOISEY

Next: End

CH OPERATION NOISY

KIT - HEAT ENGINE

Next: End

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

KIT - SIPHON TRAP

Next: End

LETBY PREHEAT3

CARTRIDGE - DIVERTER VALVE (PASSING)

Next: End

RADS COLD BOILER HOT

VALVE HEAD - DIVERTER

Next: End

BOILER HOT RADS COLD

PCB - PRIMARY

Next: End

IMPELLER

KIT - PUMP HEAD (IMPELLER)

Next: End

FALSE LOW VOLTAGE

PCB - PRIMARY

Next: End

L5 - RESTART FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE FA

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE FA - FLOW SENSOR

HARNESS - LOW VOLTAGE

Next: End

POWER OK PCB DEAD

PCB - PRIMARY

Next: End

INTEGRAL FUSE FATIGUED

PCB - PRIMARY

Next: End

POOR FLOW - RESTRICTED

KIT - PLATE HEAT EXCHANGER

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

SPARKING BUT NOT LIGHTING

ELECTRODE - IGNITION

Next: End

SPARK BUT NOT LIGHTING

ELECTRODE - IGNITION (SPARK GAP)

Next: End

BURNER DOES NOT IGNITE

KIT - GAS VALVE

Next: End

VOLTAGE TO GAS VALVE

PCB - PRIMARY

Next: End

SPARK BUT NOT LIGHTING

KIT - GAS VALVE

Next: End

PUMP RUNS

DHW INLET FILTER

Next: End

SENSOR PRIMARY FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

FAN RUNS DHW

THERMISTOR - CONTROL - FLOW/RETURN

Next: End

FAN DOES NOT RUN DHW

PCB - PRIMARY

Next: End

RESTRICTED OPERATION DHW DHW COOL RADS COLD NO CH DEMAND

KIT - SIPHON TRAP

Next: End

DHW COOL RADS COOL

KIT - PLATE HEAT EXCHANGER

Next: End

DHW COOL RADS COOL

KIT - HEAT ENGINE

Next: End

DHW COOL RADS COOL

EXTERNAL HOT WATER FAULT

Next: End

DHW COOL RADS COOL

PCB - PRIMARY

Next: End

NO FAN AT START UP

KIT - FAN

Next: End

IGNITES BUT BAFLLES OR NOISY

KIT - GAS VALVE

Next: End

FAULT CODE FA

PCB - PRIMARY

Next: End

TO PUMP - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO FAN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO DIVERTER - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

TO GASVALVE - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE F1

PCB - PRIMARY

Next: End

TO SPARK GEN - FURTHER INVESTIGATION FUSE F1

HARNESS - MAINS VOLTAGE

Next: End

DHW NOISY KETTLING

KIT - HEAT ENGINE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

KIT - CUI BOARD

Next: End

LOW SYSTEM TEMP POT

KIT - CUI BOARD

Next: End

NOT RESPONDING TO DEMAND

FLOW SENSOR - HALL EFFECT

Next: End

SPARKING OCCURS BURNER DOES NOT IGNITE

UNIT - IGNITOR

Next: End

F2 FAULT CODE

PCB - PRIMARY

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB - PRIMARY

Next: End

NO CH DEMAND 1

Next: End

NOT RESPONDING TO CH

PCB - PRIMARY

Next: End

FAN RUNS CH DEMAND 2

Next: End

NO CH DEMAND 3

Next: End

NOT RESPONDING TO CH 2

PCB - PRIMARY

Next: End

DOES NOT RECOGNISE CH DEMAND 1

HARNESS INTERNAL TIMER (X1A)

Next: End

DOES NOT RECOGNISE CH DEMAND 2

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING 1

PCB - PRIMARY

Next: End

NO CH

HARNESS INTERNAL TIMER (X1A)

Next: End

FAN RUNS CH DEMAND

Next: End

NO CH 1

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING

PCB - PRIMARY

Next: End

NO SPARKING

ELECTRODE - IGNITION

Next: End

FAN RUNS CH DEMAND 1

Next: End

NO CH 2

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO HEATING 2

PCB - PRIMARY

Next: End

NO CH DEMAND

Next: End

DOES NOT RECOGNISE CH DEMAND

HARNESS INTERNAL TIMER (X1A)

Next: End

NOT RESPONDING TO CH 1

PCB - PRIMARY

Next: End

ON WITH NO DEMAND - FROST

PCB - PRIMARY

Next: End

BLANK FOR L6 FAULT CODE RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR L1 FAULT CODE

Z DIRECTION CHOICE OR CONTINUE

Next: End

PREHEAT SATISFACTORY4

VALVE HEAD - DIVERTER

Next: End

RADS COLD BOILER HOT2

VALVE HEAD - DIVERTER

Next: End

F0-L3 - NO FLOW FAULT

PCB - PRIMARY

Next: End

FAULT CODE L3

KIT - PLATE HEAT EXCHANGER

Next: End

ALL CHECKS OK RETEST MODEL

OVERHEAT NO FAULT FOUND

Next: End

LEAKING POC

KIT - REPLACEMENT - SUMP & COVER

Next: End

LEAKING POC

MANIFOLD - FLUE C/W GUIDE BRACKET

Next: End

PUMP RUNS

REGULATOR - FLOW

Next: End

NO SPARKING

UNIT - IGNITOR

Next: End

EXPANSION CONNECTION

SYSTEM BLOCKAGES

Next: End

HOT WATER CYCLING

PCB - PRIMARY

Next: End

TO RETURN SENSOR - HOT WATER CYCLING

HARNESS - LOW VOLTAGE

Next: End

TO HEATING SENSOR - HOT WATER CYCLING

HARNESS - LOW VOLTAGE

Next: End

DHW TOO HOT

PCB - PRIMARY

Next: End

LED AT POWER UP

KIT - CUI BOARD

Next: End

TO FLOW SENSOR - FROST

HARNESS - LOW VOLTAGE

Next: End

TO RETURN SENSOR - FROST

HARNESS - LOW VOLTAGE

Next: End

MIXING - HOT WATER CYCLING

EXTERNAL HOT WATER FAULT

Next: End

NO DISPLAY SEEN

CHARACTERISTIC TEST FROM POWER UP

Next: p108

NO VOLTAGE MEASURED

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p1230

GREATER THAN 15VAC ON BLUE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p1233

PUMP ONLY RUNS FOR A SHORT TIME AND FAN DOES NOT RUN

CHARACTERISTIC TEST FROM POWER UP

Next: p130

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p2282

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p1307

FAN RUNS BUT PUMP DOES NOT

CHARACTERISTIC TEST FROM POWER UP

Next: p138

DIFFERENTIAL OK

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p1325

TEMP DIFF CORRECT LOCAL BOILING

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p1327

INLET PRESSURE DOES NOT CHANGE

CHARACTERISTIC TEST FROM PRESSURE GAS INLET (BLIP TEST)

Next: p1595

INLET PRESSURE DROPS AWAY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET (BLIP TEST)

Next: !p1564

SPARK ELECTRODE IN POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1586

SPARK GAP INCORRECT

CHARACTERISTIC TEST FROM INSPECTION ELECTRODE SPARK GAP

Next: !p1588

DHW INLET FILTER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p161

TEMPERATURE DIFFERENTIAL EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: !p1692

DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

Next: p2234

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p571

DHW COOL RADS COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2381

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p199

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1302

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p770

DIVERTER VALVE HEAD DOES NOT OPERATE CH

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p2521

DIVERTER VALVE HEAD DOES NOT OPERATE DHW

CHARACTERISTIC TEST FROM INSPECTION DIVERTER VALVE HEAD OPERATION

Next: p2523

SUMP UNSATISFACTORY

Next: !p2547

FLUE MANIFOLD UNSATISFACTORY

Next: !p2549

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p494

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p2051

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p292

BURNER IGNITES BUT BAFFLES OUT OR IS NOISY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1399

DHW FLOW LIMITER DAMAGED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FILTER DHW INLET

Next: !p34

FAN RUNS AS DESCRIBED BUT PUMP ONLY RUNS FOR A FEW SECONDS

CHARACTERISTIC TEST FROM POWER UP

Next: p522

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1322

BOILER REACHES TEMPERATURE AND/OR SHUTS DOWN RADS COLD OR COOL

CHARACTERISTIC TEST FROM OPERATION CH

Next: p742

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2464

OPERATION SATISFACTORY SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p643

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p645

BOILER FIRES WITH NO HEATING OR HOT WATER DEMAND

CHARACTERISTIC TEST FROM POWER UP

Next: p942

DISPLAY SHOWS D AND FAN RUNS BUT PUMP DOES NOT

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p981

DISPLAY SHOWS 0 AND NEITHER THE FAN NOR THE PUMP RUN

CHARACTERISTIC TEST FROM FAN RUN DHW DEMAND

Next: p964

03/09/2019 11:39:51 1908_1_50_1 07/10/2019 11:03:28

09/09/2019 12:19:41

Next: End

RESISTANCE HARNESS LOW WATER PRESSURE SENSOR

DISCONNECT CONNECTOR X8 FROM THE PCB AND THE CONNECTOR FROM THE LOW WATER PRESSURE SENSOR

Next: p1080, !f1076

VOLTAGE MAINS POWER SUPPLY

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1242, f1238

INSPECTION SYSTEM PRESSURE

Next: p1942, !f1950

RESISTANCE HARNESS LOW WATER PRESSURE SENSOR

DISCONNECT CONNECTOR X8 FROM THE PCB AND THE CONNECTOR FROM THE LOW WATER PRESSURE SENSOR

Next: p1141, !f1143

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT).

Next: !p1150, f1147

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: !p1148, !f1149

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: !p1155, f1152

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1153, !f1154

INFORMATION - RECENTLY REPLACED PCB

Next: !p1211, !f1208

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1247, f1239

3AMP FUSE FAULTY

Next: !p1240, !f1241

PCB FUSE FAULTY

Next: !p1245, !f1246

INSPECTION CONDENSATE PIPE

Next: !p1408, !f1409

PUMP RESISTANCE

UNPLUG THE HARNESS FROM THE SIDE OF THE PUMP AND REMOVE THE PUMPS ELECTRICAL COVER

Next: !p1259, !f1357

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p1438, !f1432

VOLTAGE MAINS POWER SUPPLY

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: !p1452, !f1453

POWER OFF RESET BOILER

PREHEAT OFF
WAIT APPROXIMATELY 15 SECONDS

Next: !p1457, !f1456

PUMP LIMPET TEST

Next: p1464, !f1466

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1468, !f1469

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: !p1478, !f1479

INFORMATION INTEGRAL FUSE

Next: !p1487, !f1488

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR X2A (4WAY, 5TH FROM LEFT) FROM THE PCB

Next: !p1598, !f1599

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: !p1618, !f1619

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1622, !f1623

INSPECTION INJECTOR

Next: p1649, !f1650

INSPECTION CONDENSATE PIPE

Next: !p1653, !f1654

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p1690, ?1691, ?1693

INSPECTION DIVERTER VALVE & ACTUATOR - FUSE INVESTIGATION

REMOVE DIVERTER VALV

Next: p1886, !f1907

PUMP RESISTANCE

UNPLUG THE HARNESS FROM THE SIDE OF THE PUMP AND REMOVE THE PUMPS ELECTRICAL COVER

Next: !p1889, !f1890

RESISTANCE FAN

DISCONNECT THE 3 PIN POWER CONNECTOR FROM THE FAN

Next: !p1893, !f1894

RESISTANCE DIVERTER VALVE HEAD

DISCONNECT THE HARNE

Next: !p1897, !f1898

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1901, !f1902

RESISTANCE SPARK GENERATOR

REMOVE THE MAINS CONNECTOR FROM THE SPARK GENERATOR

Next: !p1905, !f1906

VOLTAGE TO FLOW SWITCH TURBINE

Next: p2045, !f2046

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p2088, !f2089

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2096, !f2097

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2264, f2269

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2307, !f2308

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2285, f2313

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2299, f2300

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2309, !f2310

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2325, f2336

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2346, !f2347

VOLTAGE TO DIVERTER VALVE (DHW)

PREHEAT OFF
BOILER MAINS SWITCH ON
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p1018, !f1021

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2360, f2361

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2362, f2363

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2364, !f2365

INSPECTION SELECTOR SWITCH KNOB

Next: p2440, !f2463

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2443, f2444

RESISTANCE HARNESS X1A TO TERMINAL BLOCK - NO TIMER FITTED

REMOVE CONNECTOR X1A FROM THE PCB

Next: p2445, f2446

OBSERVATION INTERNAL TIMER BYPASS LINK FITTED

REMOVE BLANKING PANEL ON THE FRONT OF THE APPLIANCE

Next: !p2447, !f2448

RESISTANCE HARNESS X1A TO TERMINAL BLOCK

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTOR X1A FROM THE PCB

Next: p2455, f2456

RESISTANCE INTERNAL TIMER

INTERNAL TIMER SWITCHED TO THE ON POSITION
REMOVE CONNECTIONS 3 AND 4 FROM THE INTERNAL TIMER

Next: !p2457, !f2458

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p2488, !f2489

RESET BOILER

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p2498, f2499

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p2500, !f2501

PUMP RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X1C FROM PCB (3 WAY PLUG 3RD FROM LEFT)

Next: !p2536, !f2537

TEMPERATURE DIFFERENTIAL FLOW RETURN (CH)

PREHEAT OFF
ENSUR

Next: !p2542, !f2543

SERVICE VALVE

Next: p1489, !f30

VOLTAGE SPARK GENERATOR INPUT (AT PCB)

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p496, !f504

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p782, !f788

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: !p787, !f848

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p784, !f785

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: !p946, !f956

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p950, !f951

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p1019, !f1261

FAN AND PUMP RUN ON START UP

{ALLDEMANDOFF}
PREHEAT OFF

Next: p835, f1088

INSPECT LOW WATER PRESSURE SENSOR (BLOCKAGE)

ISOLATE BOILER FROM THE HEATING CIRCUIT AND DRAIN BOILER
REMOVE LOW WATER PRESSURE SENSOR

Next: !p1081, !f1082

VOLTAGE SENSOR LOW WATER PRESSURE (AT PCB)

PREHEAT OFF
ENSUR

Next: !p1139, f1140

INSPECT LOW WATER PRESSURE SENSOR (BLOCKAGE)

ISOLATE BOILER FROM THE HEATING CIRCUIT AND DRAIN BOILER
REMOVE LOW WATER PRESSURE SENSOR

Next: !p1144, !f1145

RESISTANCE HARNESS FAN POWER

GAIN ACCESS TO PCB
REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X3

Next: !p1236, !f1235

PCB FUSE RESISTANCE

REMOVE 4 AMP FUSE FROM PCB

Next: p1484, f1244

MAINS VOLTAGE TO FAN FROM PCB

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p133, ?1229, ?1231

CHECK FOR NOISE ON HEATING DEMAND

PREHEAT OFF
ENSURE HEATING FLOW AND RETURN VALVES ARE FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: p1303, ?1304, ?1306

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: !p1319, !f1320

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p1308, !f1309

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2029, !f2032

HEATING FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTACH TEMP PROBES TO THE FLOW AND RETURN PIPES AS CLOSE TO THE BOILER AS POSSIBLE

Next: p1323, ?1324, ?1326

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p1328, !f1329

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2033, !f2036

FAN CONTROL VOLTAGE FROM PCB

REMOVE DC ELECTRICAL CONNECTOR FROM FAN ASSEMBLY AND MAKE SAFE
PREHEAT OFF

Next: p134, !f137

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p1337, !f1338

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2193, !f2199

RESISTANCE HARNESS FAN CONTROL

REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X8

Next: p1719, !f852

VOLTAGE PUMP AT PCB START-UP

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p141, !f1200

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1502, f1407

PUMP RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X1C FROM PCB (3 WAY PLUG 3RD FROM LEFT)

Next: !p145, f142

INSPECTION DIVERTER VALVE HEAD HEATING POSITION

PREHEAT OFF
UNCLIP AND REMOVE HEAD FROM DIVERTER VALVE AND PLACE IN A SAFE POSITION

Next: p1433, f1429

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p1434, !f1435

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p1436, !f1437

HEATING FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTACH TEMP PROBES TO THE FLOW AND RETURN PIPES AS CLOSE TO THE BOILER AS POSSIBLE

Next: p1439, !f1440

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p1441, !f1442

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p1443, !f1444

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p1445, !f1446

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p1465, f1467

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT).

Next: p1860, f1477

RESISTANCE PCB INTEGRAL FUSE

DISCONNECT ALL CONNECTORS FROM THE PCB
REMOVE AND FLIP THE PCB ONTO ITS BACK

Next: !p1485, f1486

OBSERVATION COLD WATER SUPPLY

Next: p29, !f1498

INSPECTION INJECTOR

Next: p1728, !f1510

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1559, !f1593

PRESSURE GAS INLET (BLIP TEST)

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1560, ?1561, ?1563

INSPECTION BURNER

REMOVE THE BURNER

Next: p1581, !f1582

INSPECTION ELECTRODE SPARK GAP

CAREFULLY REMOVE BURNER FROM BOILER

Next: p1583, ?1585, ?1587

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1589, !f1590

INSPECTION FLUE

Next: !p1591, !f1592

VOLTAGE GAS VALVE (AT GAS VALVE)

PREHEAT SWITCHED OFF

Next: p1596, f1597

GAS VALVE RESISTANCE

REMOVE THE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: p1600, !f1601

INSPECTION INJECTOR

Next: p1602, !f1603

INSPECTION BURNER

REMOVE THE BURNER

Next: p1604, !f1605

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1606, !f1607

INSPECTION FLUE

Next: !p1608, !f1609

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT).

Next: p1616, f1617

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p2376, f1621

VOLTAGE ON/OFF SWITCH

SELECTOR SWITCH SET TO HOT WATER POSITION
GAIN ACCESS TO PCB, USE ISOLATION MAT AS REQUIRED

Next: !p1624, !f1625

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p1640, !f1641

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p1662, !f1643

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1646, !f1647

GAS RATE

Next: !p1708, f1648

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p1710, f1652

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p2183, !f2191

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1657, !f1658

INSPECTION FLUE

Next: !p1709, !f1660

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p1645, f1689

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: p1651, !f1718

RESISTANCE HARNESS FAN POWER

GAIN ACCESS TO PCB
REMOVE BOTH ENDS OF THE FAN HARNESS FROM THE FAN AND PCB X3

Next: !p1720, !f1722

INSPECTION BURNER

REMOVE THE BURNER

Next: !p1741, !f1727

INSPECTION FLUE

Next: p626, !f1738

INSPECTION DIVERTER VALVE CARTRIDGE AND WATERWAYS

DRAIN PRIMARY SYSTEM

Next: !p1861, !f1862

PUMP RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
DISCONNECT PLUG X1C FROM PCB (3 WAY PLUG 3RD FROM LEFT)

Next: p1887, f1888

RESISTANCE FAN AND HARNESS (MAINS POWER)

GAIN ACCESS TO PCB
REMOVE X3 CONNECTOR FROM THE PCB

Next: p1891, f1892

RESISTANCE HARNESS AND DIVERTER VALVE ACTUATOR

REMOVE X1D CONNECTOR (4TH FROM LEFT) FROM THE PCB

Next: p1895, f1896

GAS VALVE RESISTANCE THROUGH HARNESS

GAIN ACCESS TO PCB
REMOVE CONNECTOR X2A (4WAY, 5TH FROM LEFT) FROM THE PCB

Next: p1899, f1900

RESISTANCE HARNESS AND SPARK GENERATOR

REMOVE CONNECTOR X2B FROM THE PCB
(5WAY CONNECTOR 6TH FROM THE LEFT)

Next: !p1903, f1904

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p1138, !f1951

INSPECTION BURNER

REMOVE THE BURNER

Next: p1655, !f1994

INSPECTION DIVERTER VALVE HEAD DHW POSITION

PREHEAT OFF
UNCLIP AND REMOVE HEAD FROM DIVERTER VALVE AND PLACE IN A SAFE POSITION

Next: p234, f235

PUMP LIMPET TEST

Next: !p2030, !f2031

PUMP LIMPET TEST

Next: !p2034, !f2035

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p2039, !f2040

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p2041, !f2042

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR

Next: p2047, !f2048

INSPECTION FLOW TURBINE

ISOLATE AND DRAIN TH

Next: !p2049, !f2050

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: p1558, f2087

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE BOTH ENDS OF

Next: p2090, !f2091

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p2092, !f2093

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM THE ELECTRODE
REMOVE CONNECTOR X2B FROM THE PCB

Next: p2098, !f2099

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2135, !f2147

INSPECTION BURNER

REMOVE THE BURNER

Next: p2150, !f2155

INSPECTION FLUE

Next: !p2104, !f2105

INSPECTION BURNER

REMOVE THE BURNER

Next: p2370, !f2133

INSPECTION FLUE

Next: !p2131, !f2132

INSPECTION CONDENSATE TRAP

REMOVE THE CONDENSATE TRAP FROM THE BOILER

Next: p2141, !f2148

INSPECTION INJECTOR

Next: p2171, !f2181

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p2165, !f2170

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p524, !f2164

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2102, !f2169

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p2100, !f2182

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p1987, !f2192

INSPECTION GAS VALVE INLET FILTER

REMOVE THE GAS VALVE ASSEMBLY

Next: p2123, !f2200

OBSERVATION INTERNAL TIMER

Next: p2235, f2359

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2249, f2250

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2265, !f2266

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2267, !f2268

OBSERVATION INTERNAL TIMER

Next: p2283, f2284

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2297, f2298

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2303, !f2304

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2305, !f2306

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2326, !f2327

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2328, !f2329

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p240, !f241

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2366, !f2367

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2368, !f2369

INSPECTION SPARK ELECTRODE

REMOVE THE BURNER FROM THE BOILER

Next: p2130, !f2374

INSPECTION SELECTOR SWITCH KNOB

Next: p1620, !f2380

INSPECTION DHW CONTROL KNOB

Next: p1639, !f2438

INSPECTION HEAT EXCHANGER DHW

MAINS WATER SUPPLY O

Next: !p1422, !f812

OBSERVATION INTERNAL TIMER

Next: p2441, f2442

BYPASS EXTERNAL CONTROLS

PLACE A WIRE LINK BE

Next: !p2453, f2454

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2449, !f2450

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2451, !f2452

INSPECTION SELECTOR SWITCH

GAIN ACCESS TO THE CONTROL PCB
(THE MAIN PCB WILL NEED TO BE REMOVED)

Next: p2459, !f2460

HEATING POTENTIOMETER RESISTANCE

REMOVE THE MAIN PCB TO GAIN ACCESS TO THE CONTROL PCB

Next: !p2461, !f2462

INSPECTION CH CONTROL KNOB

Next: p639, !f2474

INSPECTION PREHEAT KNOB

Next: !p2476, !f2477

INSPECT FLAME DETECTION ELECTRODE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p2490, !f2491

TIGHTNESS TEST INSTALLATION

Next: p2492, !f2493

OBSERVATION FAULT CODE RESET (L6)

Next: !p2494, !f2495

INSPECTION SYSTEM PRESSURE

Next: p2508, !f2509

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2502, !f2503

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2504, !f2505

INFORMATION - RECENTLY REPLACED PCB

Next: !p2506, !f2507

OBSERVATION SYSTEM PRESSURE RISE

LOCATE SYSTEM FILLING LOOP

Next: p2510, !f2511

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p2512, !f2513

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p2514, !f2515

RESISTANCE NO FLOW SENSOR

REMOVE THE ELECTRICAL CONNECTOR FROM THE "NO FLOW SENSOR" ATTACHED TO THE MAIN HEAT EXCHANGER

Next: p2516, !f2517

INSPECTION DIVERTER VALVE HEAD OPERATION

SELECTOR SWITCH SET

Next: p2518, ?2520, ?2522

INSPECTION DIVERTER VALVE SPINDLE

UNCLIP AND REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p2532, !f2533

VOLTAGE DIVERTER VALVE (HEATING)

PREHEAT OFF
BOILE

Next: p2528, !f2529

VOLTAGE TO DIVERTER VALVE (DHW)

PREHEAT OFF
BOILER MAINS SWITCH ON
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)

Next: p2524, !f2525

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p2526, !f2527

RESISTANCE HARNESS DIVERTER VALVE

REMOVE HARNESS FROM THE DIVERTER VALVE
REMOVE X1D (4TH FROM LEFT) FROM THE PCB

Next: !p2530, !f2531

VOLTAGE PUMP AT PUMP

PREHEAT OFF
REMOVE THE PUMPS ELECTRICAL COVER

Next: p2534, f2535

PUMP LIMPET TEST

Next: p2538, !f2539

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p2540, f2541

INSPECTION SUMP AND FLUE MANIFOLD

Next: !p2544, ?2546, ?2548

INSPECTION FILTER DHW INLET

ISOLATE MAINS WATER SUPPLY

Next: !p1501, ?33, ?160

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1336, !f308

INSPECTION SPARK OUTPUT

REMOVE THE HT LEAD F

Next: !p2375, f495

RESISTANCE HARNESS SPARK GENERATOR INPUT

REMOVE BOTH ENDS OF

Next: p505, !f502

RESISTANCE ELECTRODE SPARK HARNESS

DISCONNECT BOTH ENDS OF THE SPARK (HT) LEAD

Next: !p506, !f507

INSPECTION SYSTEM PRESSURE

Next: p2156, !f523

VOLTAGE SENSOR LOW WATER PRESSURE (AT PCB)

PREHEAT OFF
ENSUR

Next: !p1079, f1074

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p838, !f998

HOT WATER POTENTIOMETER RESISTANCE

GAIN ACCESS TO CONTROL PCB

Next: !p793, !f792

INSPECTION FAN MECHANICAL

REMOVE THE FAN

Next: p627, !f628

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE THE BURNER FROM THE BOILER

Next: p1723, !f630

GAS INLET PRESSURE

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p660, !f661

SWITCHED LIVE VOLTAGE INPUT

PREHEAT OFF
BOILERS HEATING TEMPERATURE CONTROL TO OFF POSITION

Next: p648, !f649

EXPANSION VESSEL PRESSURE

SYSTEM PRESSURE DISCHARGED

Next: !p646, !f647

HEATING FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTACH TEMP PROBES TO THE FLOW AND RETURN PIPES AS CLOSE TO THE BOILER AS POSSIBLE

Next: p869, !f811

GAS RATE

Next: p2038, !f2043

PUMP LIMPET TEST

Next: p1428, !f1262

HOT WATER FLOW AND RETURN TEMPERATURE DIFFERENTIAL

PREHEAT OFF
ATTAC

Next: p771, f776

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT).

Next: p772, f779

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: !p994, f783

INSPECTION RIBBON CABLE

GAIN ACCESS TO PCB
REMOVE THE RIBBON CABLE JOINING THE TWO PCB'S

Next: !p836, !f837

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: p572, !f997

FLOW SENSOR RESISTANCE

DISCONNECT PLUG (PI

Next: p873, !f1014

RETURN SENSOR RESISTANCE

DISCONNECT PLUG FROM

Next: !p1204, !f1012

VOLTAGE EXTERNAL FROST STAT

{ALLDEMANDOFF}
PREHEAT OFF
GAIN ACCESS TO THE BOILERS MAIN TERMINAL STRIP

Next: p944, !f957

FLOW SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT).

Next: p948, f945

RETURN SENSOR RESISTANCE THROUGH HARNESS

DISCONNECT PLUG X6 FROM PCB (6 WAY PLUG 2ND FROM RIGHT)

Next: p2475, f949

VOLTAGE FROM HOT WATER FLOW TURBINE

PREHEAT OFF
GAIN ACCESS TO PCB (USE INSULATION MAT AS REQUIRED)
RUN HOT WATER TAP AT 3 L/MIN

Next: p1615, f2044

VOLTAGE PUMP AT PCB

PREHEAT OFF
APPLY DEMAND

Next: p982, !f1201

VOLTAGE PUMP AT PUMP

PREHEAT OFF
REMOVE THE PUMPS ELECTRICAL COVER

Next: p984, !f985

PUMP RESISTANCE

UNPLUG THE HARNESS FROM THE SIDE OF THE PUMP AND REMOVE THE PUMPS ELECTRICAL COVER

Next: !p1264, !f1269

System Information

  • Total Tests: 585
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control