XSol Diagnostic System

POTTERTON SUPRIMA 100 (WITH FLOW SWITCH)

GLOBALLY REPLACED

Next: &1468, *

NO FAULT FOUND

Next: nff

POTTERTON SUPRIMA (WITH FLOW SWITCH)

Next: &3, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &5, !f4

POWER UP

BOILER THERMOSTAT TO MAX POSITION

Next: &30, f6

FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: &363, ?96, ?100, ?210, ?344, ?1794

FURTHER INVESTIGATION FUSE (OBJECT) OUTSIDE MODEL

HEADER FOR FUSE INVESTIGATION - OUTSIDE MODEL

Next: &nff, ?1003, ?1034

FURTHER INVESTIGATION OVERHEAT (OBJECT)

HEADER FOR OVERHEAT FAULT CODE - OUTSIDE MODEL

Next: &nff, f274

OPERATION CH

CH DEMAND
BOILER THERMOSTAT SET TO MAX

Next: &525, ?364, ?366, ?370, ?437, ?439, ?526

ANTI CYCLE TIME

Next: &559, f552

OVERRUN FAN

APPLY CH DEMAND

Next: &545, !f547

OVERRUN PUMP

PUMP IS NOT AN INTEGRAL PART OF THE APPLIANCE AND WILL BE LOCATED ELSE WHERE

Next: &524, f549

FAULT CODE PAGE

Next: &nff, !f556

DHW DEMAND

Next: &1504, !f1073

FAULT CODES

HEADER FOR FAULT CODES - OUTSIDE MODEL

Next: &nff, ?563, ?567, ?571

BOILER IDENTIFICATION

Next: &1, !f1074

TYPE OF DIAGNOSTIC PROCEDURE MK1

Next: &1077, !f1076

POWER UP MK1

Next: &1095, f1078

FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND MK1

Next: &1194, ?1096, ?1100, ?1102, ?1104, ?1841

OPERATION CH MK1

CH DEMAND
BOILER THERMOSTAT SET TO MAX

Next: &1255, ?1195, ?1197, ?1199, ?1201, ?1203, ?1205

OVERRUN FAN MK1

APPLY CH DEMAND

Next: &1257, !f1256

OVERRUN PUMP MK1

PUMP IS NOT AN INTEGRAL PART OF THE APPLIANCE AND WILL BE LOCATED ELSE WHERE

Next: &1261, f1258

ANTI CYCLE TIME MK1

Next: &1265, f1262

DHW DEMAND MK1

Next: &nff, !f1266

POTTERTON SUPRIMA (WITH FLOW SWITCH) MK1 PCB

Next: &1075, !f1268

FAULT CODE PAGE MK1

Next: &nff, !f1272

FURTHER INVESTIGATION OVERHEAT (OBJECT) MK1

HEADER FOR OVERHEAT FAULT CODE - OUTSIDE MODEL

Next: &nff, f1298

FAULT CODE HARNESS

NOT USED

Next: &nff, f1325

FAULT CODE MK1 POLARITY

NOT USED

Next: &nff, f1485

FLOW SWITCH INFORMATION

Next: &584, !f1469

HEADER FOR FAN RUNS

HEADER FOR FAN RUNS - OUTSIDE MODEL

Next: &1267, f1505

FAULT FINDING FAN + CAPACITOR

Next: &nff, f1835

FAULT FINDING FAN + CAPACITOR MK1

OUTSIDE MODEL

Next: &nff, f1836

FURTHER INVESTIGATION FAN CAPACITOR

NOT USED - OUTSIDE MODEL

Next: &nff, f1860

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f1865

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW

Next: &nff, !f1867

LITE DIAGNOSTIC MK1

DIAGNOSIS RELIES ON

Next: &nff, !f1869

QUICK ACCESS DATA AND INFORMATION MK1

THE TABLE BELOW

Next: &nff, !f1871

HEADER FOR QADAI SENSOR TEMP FLOW

OK TO BE BLANK

Next: &nff, f1873

HEADER FOR QADAI GAS VALVE RESISTANCE

OK TO BE BLANK

Next: &nff, f1877

HEADER FOR QADAI GAS VALVE VOLTAGE

OK TO BE BLANK

Next: &nff, f1881

HEADER FOR QADAI PUMP RESISTANCE

OK TO BE BLANK

Next: &nff, f1885

HEADER FOR QADAI PUMP VOLTAGE

OK TO BE BLANK

Next: &nff, f1889

HEADER FOR QADAI FAN RESISTANCE

OK TO BE BLANK

Next: &nff, f1893

HEADER FOR QADAI FAN VOLTAGE

OK TO BE BLANK

Next: &nff, f1897

HEADER FOR QADAI SENSOR TEMP FLOW MK1

OK TO BE BLANK

Next: &nff, f1901

HEADER FOR QADAI GAS VALVE RESISTANCE MK1

OK TO BE BLANK

Next: &nff, f1905

HEADER FOR QADAI GAS VALVE VOLTAGE MK1

OK TO BE BLANK

Next: &nff, f1909

HEADER FOR QADAI PUMP RESISTANCE MK1

OK TO BE BLANK

Next: &nff, f1913

HEADER FOR QADAI PUMP VOLTAGE MK1

OK TO BE BLANK

Next: &nff, f1917

HEADER FOR QADAI FAN RESISTANCE MK1

OK TO BE BLANK

Next: &nff, f1921

HEADER FOR QADAI FAN VOLTAGE MK1

OK TO BE BLANK

Next: &nff, f1925

HEADER FOR QADAI POTENTIOMETER RESISTANCE MK1

OK TO BE BLANK

Next: &nff, f1929

OPEN OR SHORTCIRCUIT

GAS VALVE CV1

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

OPEN OR SHORTCIRCUITF2 APPLIANCE

GAS VALVE CV1

Next: End

FURTHER INVESTIGATION FUSE F1F2 APPLIANCE

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1F2 APPLIANCE

FAN

Next: End

DHW TEST EN D OF MODEL NFF

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER TYPE ID

Z DIRECTION CHOICE OR CONTINUE

Next: End

FOR TYPE DIAG PROCEDURE 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS CH DEMAND

Next: End

BLOWN STAND BY MODE 2

MAIN FUSE FUSED SPUR F1

Next: End

POWER UP_NO SWITCH LIVE 2

Next: End

BLOWN STANDBY MODE

FUSE MAIN PCB

Next: End

CONTAMINATION COMBSTION AIR 2

SEAL - OUTLET - FLUE

Next: End

AIR INTAKE CONTAMINATION 2

COMBUSTION CHAMBER

Next: End

MECHANICAL PHYSICAL OPERATION 2

FAN

Next: End

FLUEWAYS 2

HEAT EXCHANGER ASSEMBLY

Next: End

BLOCKED OR DAMAGED 2

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 2

GAS VALVE INLET PRESSURE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 2

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 2

FLUE

Next: End

BLOCKED OR DAMAGED 2

BURNER

Next: End

GAP DAMAGE 2

ELECTRODE

Next: End

FAN RUNS CH DEMAND 2

Next: End

FAN RUNS 2

THERMOSTAT - OVERHEAT - THERMODISC

Next: End

FAN RUNS 2

TEMPERATURE THERMISTOR

Next: End

BLOWN STAND BY MODE

MAIN FUSE FUSED SPUR F1

Next: End

UNDER PRESSURE 2

EXPANSION VESSEL

Next: End

CH OPERATION FAILURE TO REFIRE 2

Next: End

OPERATION CH OK TOO COLD BEFORE REFIRE 2

Next: End

CPERATION CH OK NO REFIRE FAN RUNS 2

THERMOSTAT - OVERHEAT - THERMODISC

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW 2

GAS VALVE INLET PRESSURE

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION 2

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY 2

Next: End

CH OPERATION BOILER NOISY 2

TEMPERATURE THERMISTOR

Next: End

FAN VOERRUN FUNCTION

PCB C/W CONTROL PANEL KIT

Next: End

OVERRUN FUNCTION 2

TEMPERATURE THERMISTOR

Next: End

ANTICYCLE TIME FUNCTION 2

TEMPERATURE THERMISTOR

Next: End

DHW DEMAND

Next: End

CASE REMOVAL 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE PAGE 3

Z DIRECTION CHOICE OR CONTINUE

Next: End

BURNERIGNITES

IGNITION LEAD

Next: End

BURNERIGNITES

LEAD ASSEMBLY - MK1

Next: End

CALIBRATION OPERATION CH

POTENTIOMETER C/W CABLE AND NUT

Next: End

OPERATIONCH BOILER NOISY 2

GAS RATE

Next: End

MK1 WITH POTFURTHER INVESTIGATION OVERHEAT BOILR SHUTS DOWN PREMATURELY

PUMP

Next: End

MK1 WITH POTFURTHER INVESTIGATION OVERHEAT BOILER NOISE

Next: End

MK1 WITH POTFAN RUNS LOW BOILER GOES TO OVERHEAT BOILER NOISEY

TEMPERATURE THERMISTOR

Next: End

CALIBRATION FURTHER INVESTIGATION OVERHEAY MK1

POTENTIOMETER C/W CABLE AND NUT

Next: End

MK1 WITH POTHIGH BOILER GOES TO OVER HEATBOILER SHUTS DOWN PREMATURELY

GAS RATE

Next: End

RESISTOR FAULTY

HARNESS WIRING - THERMISTOR

Next: End

INCORRECT POLARITY 2

Next: End

PCB LOCKOUT

PUMP AND PCB

Next: End

RED LOCKOUT FULL TEST

Z DIRECTION CHOICE OR CONTINUE

Next: End

LED

PCB C/W CONTROL PANEL KIT

Next: End

FLOW SWITCH INFO

Z DIRECTION CHOICE OR CONTINUE

Next: End

PCB LOCKOUTMK1

PUMP AND PCB

Next: End

RED LOCKOUT FULL TESTMK1

Z DIRECTION CHOICE OR CONTINUE

Next: End

POLARITY 2

Next: End

BLANK FOR FAN RUNS 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW

TEMPERATURE THERMISTOR

Next: End

BURNER PRESSURE

GAS VALVE ADJUSTMENT

Next: End

CALIBRATION LOW BOILER TEMP LOW SYSTEM TEMP LOW 2

TEMPERATURE THERMISTOR

Next: End

BURNER PRESSURE 2

GAS VALVE ADJUSTMENT

Next: End

OPERATION CH OK NO REFIRE

Next: End

OPERATION CH OK NO REFIRE

TEMPERATURE THERMISTOR

Next: End

OPERATION CH OK NO REFIRE 2

Next: End

OPERATION CH OK NO REFIRE 2

TEMPERATURE THERMISTOR

Next: End

FAULT CODE RED EVERY 5 SECS - TO EARTH

HARNESS WIRING - THERMISTOR

Next: End

FAILS TO PROVE FAN RUNS

PRESSURE SWITCH HONEYWELL

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCUR

PCB - CONTROL - W/O CASSETTE

Next: End

WIRING TO PUMP

HARNESS WIRING TO PUMP

Next: End

LIMPET TEST

PUMP

Next: End

BLOCKED OR DAMAGED STOPPING APS

FLUE

Next: End

DIRTY OR RESTRICTED

FAN

Next: End

FLUEWAYS RESTRICTED STOPPING APS

HEAT EXCHANGER ASSEMBLY

Next: End

DAMAGED

IGNITION LEAD

Next: End

DAMAGED

ELECTRODE

Next: End

INCORRECT

ELECTRODE

Next: End

FAILS TO PROVE FAN RUNS 2

PRESSURE SWITCH HONEYWELL

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCUR

PCB C/W CONTROL PANEL KIT

Next: End

WIRING TO PUMP

HARNESS WIRING TO PUMP

Next: End

BLOCKED OR DAMAGED STOPPING APS 2

FLUE

Next: End

DIRTY OR RESTRICTED 2

FAN

Next: End

FLUEWAYS RESTRICTED STOPPING APS 2

HEAT EXCHANGER ASSEMBLY

Next: End

DAMAGED

LEAD ASSEMBLY - MK1

Next: End

DAMAGED 2

ELECTRODE

Next: End

INCORRECT 2

ELECTRODE

Next: End

BYPASS SYSTEM SPARKING DOES NOT OCCUR

Next: End

FAN RUNS BURNER DOES NOT IGNITE

AIR IN SYSTEM / LOW PRESSURE

Next: End

OPEN VENT SYSTEMBOILER TO TEMP RADS COOL

PUMP

Next: End

OPEN VENT SYSTEMCH OPERATION

Next: End

OPERATION CH - UP TO TEMP RADS COLD

AIR IN SYSTEM / LOW PRESSURE

Next: End

FAN RUNS BURNER DOES NOT IGNITE MK1

AIR IN SYSTEM / LOW PRESSURE

Next: End

LIMPET TEST MK1

PUMP

Next: End

BYPASS SYSTEM SPARKING DOES NOT OCCUR MK1

Next: End

OPERATION CH - UP TO TEMP RADS COLD MK1

AIR IN SYSTEM / LOW PRESSURE

Next: End

OPEN VENT SYSTEMBOILER TO TEMP RADS COOL MK1

PUMP

Next: End

OPEN VENT SYSTEMCH OPERATION MK1

Next: End

DELAYED / EXPLOSIVE

GAS VALVE INLET PRESSURE

Next: End

DELAYED / EXPLOSIVE

ELECTRODE

Next: End

DELAYED / EXPLOSIVE

IGNITION LEAD

Next: End

DELAYED / EXPLOSIVE

BURNER

Next: End

FAULT FINDING FAN + CAPACITOR

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT FINDING FAN + CAPACITOR MK1

Z DIRECTION CHOICE OR CONTINUE

Next: End

DELAYED / EXPLOSIVE MK1

GAS VALVE INLET PRESSURE

Next: End

DELAYED / EXPLOSIVE MK1

ELECTRODE

Next: End

DELAYED / EXPLOSIVE MK1

IGNITION LEAD

Next: End

DELAYED / EXPLOSIVE MK1

BURNER

Next: End

FURTHER INVESTIGATION

FAN / CAPACITOR

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR LITE DIAGNOSTIC MK1

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI MK1

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

TEMPERATURE THERMISTOR

Next: End

QADAI

GAS VALVE CV1

Next: End

QADAI GAS VALVE VOLTAGE ABSENT

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI PUMP RESISTANCE

PUMP

Next: End

QADAI PUMP VOLTAGE

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI FAN RESISTANCE

FAN

Next: End

QADAI FAN VOLTAGE

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI MK1

TEMPERATURE THERMISTOR

Next: End

QADAI MK1

GAS VALVE CV1

Next: End

QADAI GAS VALVE VOLTAGE ABSENT MK1

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI PUMP RESISTANCE MK1

PUMP

Next: End

QADAI PUMP VOLTAGE MK1

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI FAN RESISTANCE MK1

FAN

Next: End

QADAI FAN VOLTAGE MK1

PCB - CONTROL - W/O CASSETTE

Next: End

QADAI

POTENTIOMETER C/W CABLE AND NUT

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS VALVE INLET PRESSURE

Next: End

GAS VALVE HAS DAMAGED PCB

PCB AND GAS VALVE

Next: End

GAS VALVE HAS DAMAGED PCB MK1

PCB AND GAS VALVE

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLOWN STANDBY MODE

FUSE MAIN PCB

Next: End

BLOCKED OR DAMAGED

BURNER

Next: End

GAP DAMAGE

ELECTRODE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

POWER UP_NO SWITCH LIVE

Next: End

FURTHER INVESTIGATION OVERHEAT BOILR SHUTS DOWN PREMATURELY

PUMP

Next: End

FURTHER INVESTIGATION OVERHEAT BOILER NOISE

Next: End

FAN RUNS LOW BOILER GOES TO OVERHEAT BOILER NOISEY

TEMPERATURE THERMISTOR

Next: End

LED

PCB - CONTROL - W/O CASSETTE

Next: End

FAN RUNS

THERMOSTAT - OVERHEAT - THERMODISC

Next: End

HIGH BOILER GOES TO OVER HEATBOILER SHUTS DOWN PREMATURELY

GAS RATE

Next: End

MECHANICAL PHYSICAL OPERATION

FAN

Next: End

FLUEWAYS

HEAT EXCHANGER ASSEMBLY

Next: End

BLOCKED OR DAMAGED

FLUE

Next: End

CONTAMINATION COMBSTION AIR

SEAL - OUTLET - FLUE

Next: End

AIR INTAKE CONTAMINATION

COMBUSTION CHAMBER

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY

Next: End

CH OPERATION BOILER NOISY

TEMPERATURE THERMISTOR

Next: End

OPERATIONCH BOILER NOISY

GAS RATE

Next: End

CPERATION CH OK NO REFIRE FAN RUNS

THERMOSTAT - OVERHEAT - THERMODISC

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS VALVE INLET PRESSURE

Next: End

OPERATION CH OK TOO COLD BEFORE REFIRE

Next: End

UNDER PRESSURE

EXPANSION VESSEL

Next: End

FAN VOERRUN FUNCTION

PCB - CONTROL - W/O CASSETTE

Next: End

FAN RUNS

TEMPERATURE THERMISTOR

Next: End

OVERRUN FUNCTION

TEMPERATURE THERMISTOR

Next: End

ANTICYCLE TIME FUNCTION

TEMPERATURE THERMISTOR

Next: End

FAULT CODE PAGE 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNSFAULT CODE RED EVERY FIVE SECS

TEMPERATURE THERMISTOR

Next: End

INCORRECT POWER TO GAS VALVE

PCB - CONTROL - W/O CASSETTE

Next: End

FURTHER INVESTIGATION FUSE F1 PILOT SOLENOID

HARNESS GAS VALVE - FUSE INVESTIGATION

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS PUMP

Next: End

FUSE F1

FURTHER INVESTIGATION CHOICE

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS - FAN - FUSE INVESTIGATION

Next: End

FURTHER INVESTIGATION FUSE F1 PILOT SOLENOIDF2 APPLIANCE

HARNESS GAS VALVE - FUSE INVESTIGATION

Next: End

FURTHER INVESTIGATION FUSE F1F2 APPLIANCE

HARNESS PUMP

Next: End

FUSE F2 APPLIANCE

FURTHER INVESTIGATION CHOICE

Next: End

FURTHER INVESTIGATION FUSE F1F2 APPLIANCE

HARNESS - FAN - FUSE INVESTIGATION

Next: End

SUPPLY FAULT 2

Next: End

FURTHER INVESTIGATION F1 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS BURNER IGNITES_VOLTAGE AT FAN 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN DOES NOT RUN

FAN

Next: End

FURTHER IN VESTIGATION F2 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION LED PCB FAULT 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT

HARNESS ASSEMBLY - FAN

Next: End

AIR INTAKE CONTAMINATION 2

FLUE

Next: End

FLAME LIFT OFF 2

SEAL - OUTLET - FLUE

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB C/W CONTROL PANEL KIT

Next: End

BOCKED OR DAMAGED SPARKING OCCURS BURNER DOESNOT IGNITE 2

INJECTOR

Next: End

FAN DOES NOT RUN

PRESSURE SWITCH HONEYWELL

Next: End

FAN DOES NOT RUN 2

FAN

Next: End

FAULT

WIRING LOOM ASSEMBLY - FAN

Next: End

FAN DOES NOT RUN 2

PRESSURE SWITCH HONEYWELL

Next: End

OVER HEAT STAT FAN RUNS

WIRING LOOM ASSEMBLY - OVERHEAT STAT

Next: End

FAN RUNS FURTHER INVESTIGATION OVERHEAT 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVER HEAT STAT FAN RUNS

HARNESS ASSEMBLY - OVERHEAT STAT

Next: End

FAN DOES NOT RUN

PCB C/W CONTROL PANEL KIT

Next: End

FAN RUNS 2

WIRING LOOM - THERMISTOR

Next: End

EXPANSION CONNECTION 2

PIPEWORK TO EXPANSION VESSEL

Next: End

OPERATION CH TOO LONG FOR REFIRECIRCULATION 2

Next: End

OPERATION CH OPERATION OK GOES TO OVER HEAT 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

PUMP OVERRUN FUNCTION

PCB C/W CONTROL PANEL KIT

Next: End

ANTICYCLE TIME FUNCTION

PCB C/W CONTROL PANEL KIT

Next: End

FLAME SENSE

PCB - CONTROL - W/O CASSETTE

Next: End

BURNER IGNITES

ELECTRODE

Next: End

FLAME SENSE

PCB C/W CONTROL PANEL KIT

Next: End

BURNER IGNITES 2

ELECTRODE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB C/W CONTROL PANEL KIT

Next: End

CH OPERATION NOISY 2

HEAT EXCHANGER ASSEMBLY

Next: End

CH OPERATION NOISEY 2

Next: End

MK1 WITH POTNOISE

HEAT EXCHANGER ASSEMBLY

Next: End

MK1 WITH POTFURTHER INVESTIGATIONOVERHEAT

Next: End

NOT READING RESISTOR

PCB - CONTROL - W/O CASSETTE

Next: End

RED LOCKOUT RESETS

PUMP

Next: End

FURTHER INVESTICATION RED LOCKOUT

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEATS

PCB C/W CONTROL PANEL KIT

Next: End

RED LOCKOUT RESETSMK1

PUMP

Next: End

FURTHER INVESTICATION RED LOCKOUTMK1

Z DIRECTION CHOICE OR CONTINUE

Next: End

RED LOCKOUT WONT RESET

PCB - CONTROL - W/O CASSETTE

Next: End

POLARITY

PCB C/W CONTROL PANEL KIT

Next: End

BLANK FOR FAN RUNS

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLOCKED OR DAMAGED FAN DOES NOT RUN

TUBE

Next: End

RESTRICTED OR BLOCKED 2

VENTURI

Next: End

BLOCKED OR DAMAGED FAN DOES NOT RUN 2

TUBE

Next: End

RESTRICTED OR BLOCKED MK1

VENTURI

Next: End

BOILER AND SYSTEM TEMP LOW

HARNESS WIRING - THERMISTOR

Next: End

LOW GAS RATE CH OPERATION

INJECTOR

Next: End

LOW SYSTEM TEMP POT

PCB - CONTROL - W/O CASSETTE

Next: End

BOILER AND SYSTEM TEMP LOW MK1

HARNESS WIRING - THERMISTOR

Next: End

LOW GAS RATE CH OPERATION 2

INJECTOR

Next: End

LOW SYSTEM TEMP POT

PCB C/W CONTROL PANEL KIT

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB - CONTROL - W/O CASSETTE

Next: End

TOO COOL BEOFRE REFIRE

HARNESS WIRING - THERMISTOR

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB C/W CONTROL PANEL KIT

Next: End

TOO COOL BEOFRE REFIRE

WIRING LOOM - THERMISTOR

Next: End

FAN DOES NOT RUNFAULT CODE RED EVERY FIVE SECS

PCB - CONTROL - W/O CASSETTE

Next: End

CH DEMAND SPARKING DOES NOT OCCUR

PUMP

Next: End

BLOCKED OR DAMAGED FAN RUNS SPARKING DOES NOT OCCUR

TUBE

Next: End

RESTRICTED OR BLOCKED

VENTURI

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

PCB - CONTROL - W/O CASSETTE

Next: End

CH DEMAND SPARKING DOES NOT OCCUR 2

PUMP

Next: End

BLOCKED OR DAMAGED FAN RUNS SPARKING DOES NOT OCCUR 2

TUBE

Next: End

RESTRICTED OR BLOCKED MK 1 (2)

VENTURI

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

PCB C/W CONTROL PANEL KIT

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

FLOW SWITCH

Next: End

OPEN VENT SYSTEMCH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

FAN RUNS SPARKING DOES NOT OCCUR MK1

FLOW SWITCH

Next: End

OPEN VENT SYSTEMCH OPERATION BOILER UP TO TEMP RADS COLD MK1

Next: End

DELAYED / EXPLOSIVE - SOFT LIGHT FAULT

GAS VALVE CV1

Next: End

DELAYED / EXPLOSIVE

GAS VALVE ADJUSTMENT

Next: End

DELAYED / EXPLOSIVE - POOR SPARK

PCB - CONTROL - W/O CASSETTE

Next: End

DELAYED / EXPLOSIVE

INJECTOR

Next: End

FAULT FINDING FAN + CAPACITOR

FAN / CAPACITOR

Next: End

FAULT FINDING FAN + CAPACITOR MK1

FAN / CAPACITOR

Next: End

DELAYED / EXPLOSIVE - SOFT LIGHT FAULT MK1

GAS VALVE CV1

Next: End

DELAYED / EXPLOSIVE MK1

GAS VALVE ADJUSTMENT

Next: End

DELAYED / EXPLOSIVE - POOR SPARK MK1

PCB - CONTROL - W/O CASSETTE

Next: End

DELAYED / EXPLOSIVE MK1

INJECTOR

Next: End

FAN CAPACITOR

FURTHER INVESTIGATION CHOICE

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE

RESULT AS EXPECTED

Next: End

FAN RESISTANCE

RESULT AS EXPECTED

Next: End

FAN VOLTAGE

RESULT AS EXPECTED

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED MK1

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED MK1

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED MK1

Next: End

PUMP RESISTANCE

RESULT AS EXPECTED MK1

Next: End

PUMP VOLATGE

RESULT AS EXPECTED MK1

Next: End

FAN RESISTANCE

RESULT AS EXPECTED MK1

Next: End

FAN VOLTAGE

RESULT AS EXPECTED MK1

Next: End

POTENTIOMETER RESISTANCE

RESULT AS EXPECTED MK1

Next: End

POOR SUPPLY

GAS VALVE INLET PRESSURE

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT

GAS VALVE CV1

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT

HARNESS ASSEMBLY - GAS VALVE

Next: End

VOLTAGE TO GAS VALVE

PCB - CONTROL - W/O CASSETTE

Next: End

HARNESS HAS DAMAGED PCB

PCB AND HARNESS

Next: End

POOR SUPPLY 2

GAS VALVE INLET PRESSURE

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT 2

GAS VALVE CV1

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT

WIRING LOOM ASSEMBLY - GAS VALVE

Next: End

VOLTAGE TO GAS VALVE MK1

PCB - CONTROL - W/O CASSETTE

Next: End

HARNESS HAS DAMAGED PCB MK1

PCB AND HARNESS

Next: End

BOCKED OR DAMAGED SPARKING OCCURS BURNER DOESNOT IGNITE

INJECTOR

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB - CONTROL - W/O CASSETTE

Next: End

FAN RUNS BURNER IGNITES_VOLTAGE AT FAN

Z DIRECTION CHOICE OR CONTINUE

Next: End

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

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS FURTHER INVESTIGATION OVERHEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY

PCB - CONTROL - W/O CASSETTE

Next: End

NOISE

HEAT EXCHANGER ASSEMBLY

Next: End

FURTHER INVESTIGATIONOVERHEAT

Next: End

FLAME LIFT OFF

SEAL - OUTLET - FLUE

Next: End

AIR INTAKE CONTAMINATION

FLUE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB - CONTROL - W/O CASSETTE

Next: End

CH OPERATION NOISY

HEAT EXCHANGER ASSEMBLY

Next: End

CH OPERATION NOISEY

Next: End

FAN RUNS

HARNESS WIRING - THERMISTOR

Next: End

FAN DOES NOT RUN

PCB - CONTROL - W/O CASSETTE

Next: End

OPERATION CH OPERATION OK GOES TO OVER HEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

EXPANSION CONNECTION

PIPEWORK TO EXPANSION VESSEL

Next: End

OPERATION CH TOO LONG FOR REFIRECIRCULATION

Next: End

PUMP OVERRUN FUNCTION

PCB - CONTROL - W/O CASSETTE

Next: End

ANTICYCLE TIME FUNCTION

PCB - CONTROL - W/O CASSETTE

Next: End

FAN RUNSFAULT CODE RED EVERY FIVE SECS

HARNESS WIRING - THERMISTOR

Next: End

FALSE FLAME SENSED

PCB - CONTROL - W/O CASSETTE

Next: End

LETTING BY SLOW SHUT OFF

GAS VALVE CV1

Next: End

SUPPLY FAULT

Next: End

FAN RUNS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1640

F1

CHARACTERISTIC TEST FROM FURTHER INVESTIGATION FUSE (OBJECT)

Next: p1004

F2

CHARACTERISTIC TEST FROM FURTHER INVESTIGATION FUSE (OBJECT)

Next: p1035

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1097

FAN RUNS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1701

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1103

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1105

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1196

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1787

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1200

OPERATION OK BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1202

OPERATION OK BOILER AND SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1204

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1206

TEMP DIFF INCORRECT LOCAL BOILING

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

Next: !p1294

DIFFERENTIAL OK

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

Next: !p1296

TEMP DIFF INCORRECT LOCAL BOILING

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

Next: !p1321

DIFFERENTIAL OK

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

Next: !p1323

TUBES RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: !p1515

VENTURI RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1517

TUBES RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: !p1550

VENTURI RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1552

TUBES SPLIT, RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1686

VENTURI RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1688

TUBES SPLIT, RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1747

VENTURI RESTRICTED OR BLOCKED

CHARACTERISTIC TEST FROM INSPECTION AIR PRESSURE TUBES AND VENTURI

Next: !p1749

DELAYED / EXPLOSIVE IGNITION

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1795

PRESSURE SLOWLY RAMPS UP AS ABOVE BUT OPERATING PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: p1799

BOILER LIGHTS IMMEDIATELY AT FULL RATE

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: !p1801

DELAYED / EXPLOSIVE IGNITION

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p1842

PRESSURE SLOWLY RAMPS UP AS ABOVE BUT OPERATING PRESSURE INCORRECT

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: p1846

BOILER LIGHTS IMMEDIATELY AT FULL RATE

CHARACTERISTIC TEST FROM PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

Next: !p1848

INLET PRESSURE LOW OR DIES AWAY DURING IGNITION

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: !p1936

INLET PRESSURE SATISFACTORY BUT DOES NOT DIP DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: p1939

INLET PRESSURE LOW OR DIES AWAY DURING IGNITION

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: !p1950

INLET PRESSURE SATISFACTORY BUT DOES NOT DIP DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET DROP

Next: p1953

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p211

TEMP DIFF INCORRECT LOCAL BOILING

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

Next: !p308

DIFFERENTIAL OK

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

Next: !p310

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p345

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p365

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1773

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p371

TEMP DIFF INCORRECT LOCAL BOILING

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

Next: !p428

DIFFERENTIAL OK

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

Next: !p430

OPERATION OK BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p478

OPERATION OK BOILER AND SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p440

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p527

FLASHING ONCE EVERY FIVE SECONDS

CHARACTERISTIC TEST FROM FAULT CODES

Next: p575

FLASHING RED ORANGE ONCE EVERY 5 SECONDS

CHARACTERISTIC TEST FROM FAULT CODES

Next: p568

CONTINUOUS RED

CHARACTERISTIC TEST FROM FAULT CODES

Next: p1424

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES CH DEMAND

Next: p106

18/04/2023 07:53:29 2301_2_50_1 21/06/2023 13:14:02

21/04/2023 06:54:00

Next: End

FUSE FURTHER INVESTIGATION F1

Next: !p11, !f12

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1007, !f1008

RESISTANCE PUMP

THE PUMP IS NOT AN I

Next: !p1028, !f1029

RESISTANCE FAN

DISCONNECT VIOLET LEADS FROM THE FAN

Next: !p1032, !f1033

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1038, !f1039

RESISTANCE PUMP

THE PUMP IS NOT AN I

Next: !p1059, !f1060

RESISTANCE FAN

DISCONNECT VIOLET LEADS FROM THE FAN

Next: !p1063, !f1064

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p1079, f1080

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1081, f1082

FUSE FURTHER INVESTIGATION F1

Next: !p1083, !f1084

VOLTAGE BOILER SWITCHED LIVE MK1

THERMOSTAT TO OFF POSITION

Next: p1087, !f1088

FUSE FURTHER INVESTIGATION F2 MK1

Next: !p1091, !f1092

VOLTAGE FAN (AT PCB)

Next: !p111, f112

INSPECTION FLUE SEALS MK1

Next: p1108, !f1109

RESISTANCE AIR PRESSURE SWITCH AND HARNESS OPEN CIRCUIT

DISCONNECT THE TWELVE PIN CONNECTOR FROM PCB

Next: p113, f114

RESISTANCE ELECTRODE SENSE AND HARNESS MK1

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
DISCONNECT ELECTRODE LEAD FROM PCB

Next: p1122, f1282

INSPECTION AIR PRESSURE TUBES AND VENTURI

REMOVE VENTURI FROM FAN ASSEMBLY
REMOVE APS TUBES

Next: !p115, ?1514, ?1516

VOLTAGE FAN (AT PCB) MK1

Next: !p1178, f1179

RESISTANCE AIR PRESSURE SWITCH AND HARNESS OPEN CIRCUIT MK1

DISCONNECT THE CONNECTOR PLUG MARKED J5 FROM PCB

Next: p1180, f1181

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE WHITE LEADS FROM THE OVERHEAT STAT

Next: !p119, f299

INSPECTION AIR PRESSURE TUBES AND VENTURI MK1

REMOVE VENTURI FROM FAN ASSEMBLY
REMOVE APS TUBES

Next: !p1182, ?1549, ?1551

RESISTANCE SENSOR OVERHEAT STAT MK1

DISCONNECT THE WHITE LEADS FROM THE OVERHEAT STAT

Next: !p1186, f1187

FURTHER INVESTIGATION OVER HEAT PROBLEM MK1

Next: !p1188, !f1189

RESISTANCE SENSOR TEMP FLOW MK1

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1192, !f1193

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1213, !f1214

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1259, !f1260

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1263, !f1264

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT ELECTRODE LEAD FROM ELECTRODE AND PCB

Next: !p1277, !f1278

RESISTANCE ELECTRODE SENSE HARNESS

DISCONNECT ELECTRODE LEAD FROM ELECTRODE AND PCB

Next: !p1283, !f1284

PUMP LIMPET TEST

Next: p1299, !f1300

RESISTANCE HARNESS RESISTOR

DISCONNECT THE TWELVE PIN CONNECTOR FROM PCB

Next: !p1326, !f1327

VOLTAGE BOILER SWITCHED LIVE

THERMOSTAT TO OFF POSITION

Next: p15, !f262

VOLTAGE MAINS POWER INPUT TO APPLIANCE POLARITY

REMOVE CONTROL BOX COVER

Next: p1436, !f1437

OBSERVATION PUMP TYPE

LOCATE CIRCULATING PUMP FITTED ON THE SYSTEM EXTERNALLY TO THE BOILER

Next: !p1501, !f1450

OBSERVATION DOES BOILER RESET MK1

Next: p1486, f1487

VOLTAGE MAINS POWER INPUT TO APPLIANCE POLARITY

REMOVE CONTROL BOX COVER

Next: p1488, !f1498

OBSERVATION PUMP TYPE

LOCATE CIRCULATING PUMP FITTED ON THE SYSTEM EXTERNALLY TO THE BOILER

Next: !p1503, !f1493

OBSERVATION FAN RUNS

GAIN ACCESS TO FAN ASSEMBLY

Next: !p1506, !f1507

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1593, !f1592

PRESSURE GAS BURNER (OPERATION)

THERMOSTAT TURNED TO MAXIMUM
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: !p1597, !f1598

RESISTANCE SENSOR TEMP FLOW MK1

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1604, !f1603

PRESSURE GAS BURNER (OPERATION)

THERMOSTAT TURNED TO MAXIMUM
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: !p1607, !f1608

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1629, !f1628

RESISTANCE SENSOR TEMP FLOW MK1

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1636, !f1635

AIR PRESSURE SWITCH PROVING

DISCONNECT LEADS FRO

Next: p1659, !f1660

PUMP RUNS CH DEMAND

THERMOSTAT TURNED TO OFF POSITION

Next: p1766, f1664

VOLTAGE PUMP AT BOILER

APPLY HEATING DEMAND

Next: p1665, !f1666

AIR PRESSURE SWITCH PROVING MK1

DISCONNECT LEADS FRO

Next: p1720, !f1721

PUMP RUNS CH DEMAND

THERMOSTAT TURNED TO OFF POSITION

Next: p1780, f1725

VOLTAGE PUMP AT PCB MK1

APPLY HEATING DEMAND

Next: p1726, !f1727

FUSE FURTHER INVESTIGATION F2

Next: !p19, !f20

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p1808, !f1807

VOLTAGE FAN WITH CAPACITOR (AT PCB)

Next: !p1837, !f1838

VOLTAGE FAN WITH CAPACITOR (AT PCB) MK1

Next: !p1839, !f1840

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p1855, !f1856

INSPECTION FAN AND CAPACITOR

DISCHARGE CAPACITOR BEFORE CARRYING OUT TEST (REFER TO TOPS P4)

Next: !p1861, !f1863

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1874, !f1875

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1878, !f1879

VOLTAGE GAS VALVE (AT PCB)

Next: !p1882, !f1883

RESISTANCE PUMP

THE PUMP IS NOT AN I

Next: !p1886, !f1887

VOLTAGE PUMP AT BOILER

APPLY HEATING DEMAND

Next: !p1890, !f1891

RESISTANCE FAN

DISCONNECT VIOLET LEADS FROM THE FAN

Next: !p1894, !f1895

VOLTAGE FAN (AT PCB)

Next: !p1898, !f1899

RESISTANCE SENSOR TEMP FLOW MK1

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p1902, !f1903

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1906, !f1907

VOLTAGE GAS VALVE (AT PCB) MK1

Next: !p1910, !f1911

RESISTANCE PUMP

THE PUMP IS NOT AN I

Next: !p1914, !f1915

VOLTAGE PUMP AT PCB MK1

APPLY HEATING DEMAND

Next: !p1918, !f1919

RESISTANCE FAN

DISCONNECT VIOLET LEADS FROM THE FAN

Next: !p1922, !f1923

VOLTAGE FAN (AT PCB) MK1

Next: !p1926, !f1927

RESISTANCE POTENTIOMETER TEMP FLOW

DISCONNECT MOLEX CONNECTOR J9 FROM PCB

Next: !p1930, !f1931

VOLTAGE GAS VALVE (AT PCB)

Next: !p1942, f1943

RESISTANCE GAS VALVE SOLENOID AND HARNESS

DISCONNECT GAS VALVE CONNECTOR
PLUG FROM THE PCB

Next: !p1944, f1945

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1946, !f1947

VOLTAGE GAS VALVE (AT PCB) MK1

Next: !p1956, f1957

RESISTANCE GAS VALVE SOLENOID AND HARNESS

DISCONNECT GAS VALVE CONNECTOR
PLUG FROM THE PCB

Next: !p1958, f1959

RESISTANCE GAS VALVE SOLENOID

DISCONNECT THE MOLEX PLUG FROM THE GAS VALVE

Next: !p1960, !f1961

RESISTANCE ELECTRODE SENSE AND HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING
DISCONNECT ELECTRODE LEAD FROM PCB

Next: p249, f1276

PUMP LIMPET TEST

Next: p275, !f276

FURTHER INVESTIGATION OVER HEAT PROBLEM

Next: !p300, !f301

INSPECTION FLUE SEALS

Next: p359, !f356

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p454, !f548

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p546, !f523

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p550, !f551

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p553, !f554

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: !p578, !f579

VOLTAGE GAS VALVE (AT VALVE SHUTDOWN)

Next: !p582, !f583

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p7, f8

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p9, f10

RESISTANCE GAS VALVE SOLENOID AND HARNESS

DISCONNECT GAS VALVE CONNECTOR
PLUG FROM THE PCB

Next: p1025, f1006

RESISTANCE PUMP AND HARNESS

DISCONNECT LEADS FRO

Next: p1026, f1027

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR PLUG FROM THE PCB

Next: !p1030, f1031

RESISTANCE GAS VALVE SOLENOID AND HARNESS

DISCONNECT GAS VALVE CONNECTOR
PLUG FROM THE PCB

Next: p1056, f1037

RESISTANCE PUMP AND HARNESS

DISCONNECT LEADS FRO

Next: p1057, f1058

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR PLUG FROM THE PCB

Next: !p1061, f1062

VOLTAGE BOILER SWITCHED LIVE

THERMOSTAT TO OFF POSITION

Next: p107, !f108

VOLTAGE FAN (AT FAN)

Next: !p109, f110

FAN RUNS MK1

Next: p1085, f1086

FURTHER INVESTIGATION LED PROBLEM MK1

Next: !p1093, !f1466

RESISTANCE FUSE F2 ( APPLIANCE) MK1

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: !p1089, f1090

VOLTAGE BOILER SWITCHED LIVE MK1

THERMOSTAT TO OFF POSITION

Next: p1174, !f1175

PRESSURE GAS INLET DROP

APPLY CH DEMAND
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1130, ?1949, ?1951

PRESSURE GAS INLET MK1

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
APPLY CH DEMAND

Next: p1118, !f1119

DID BURNER BAFFLE OR ROLL DOWN OR LIFT OFF

Next: p1106, f1107

INSPECTION FAN MECHANICAL MK1

REMOVE FAN

Next: p1112, !f1113

INSPECTION COMBUSTION CHAMBER MK1

REMOVE COMBUSTION CHAMBER COVER

Next: !p1110, !f1111

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS) MK1

Next: p1114, !f1115

INSPECTION FLUE

Next: !p1116, !f1117

VOLTAGE RECTIFICATION MK1

Next: !p1281, f1121

INSPECTION BURNER MK1

Next: p1124, !f1125

INSPECTION FLUE

Next: !p1126, !f1127

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT THE TWELVE PIN CONNECTOR FROM PCB

Next: p452, f118

INSPECTION BURNER MK1

Next: p1138, !f1139

INSPECTION ELECTRODE AND GAP MK1

Next: !p1140, !f1141

VOLTAGE FAN (AT FAN) MK1

Next: !p1176, f1177

RESISTANCE OVERHEAT STAT AND HARNESS MK1

DISCONNECT THE 9 PIN CONNECTOR MARKED J6 PCB

Next: p1184, f1185

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS MK1

DISCONNECT THE 3 PIN CONNECTOR MARKED J5 (YELLOW LEADS) FROM THE PCB

Next: !p1190, f1191

PUMP LIMPET TEST

Next: p1241, !f1242

GAS INLET PRESSURE MK1

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
APPLY CH DEMAND

Next: p1600, !f1222

RESISTANCE OVERHEAT STAT AT TEMP MK1

ALLOW APPLIANCE TO FIRE AND SYSTEM TO HEAT UNTIL BOILER SHUTS DOWN

Next: !p1219, !f1220

VOLTAGE BOILER SWITCHED LIVE OPERATION REFIRE MK1

THERMOSTAT TO OFF POSITION

Next: p1209, !f1210

EXPANSION VESSEL PRESSURE

SYSTEM DISCHARGED

Next: !p1207, !f1208

TEMPERATURE SYSTEM FLOW MK1

BOILER STAT SET TO MID RANGE

Next: p1630, f1212

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p1243, !f1244

RESISTANCE SENSOR TEMP FLOW MK1

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: p1286, !f1246

RESISTANCE POTENTIOMETER TEMP FLOW

DISCONNECT MOLEX CONNECTOR J9 FROM PCB

Next: p1288, !f1287

GAS RATE

Next: p1289, !f1290

TEMPERATURE DIFFERENTIAL FLOW AND RETURN MK1

BOILER STAT TO MID RANGE

Next: !p1291, ?1293, ?1295

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p1301, !f1302

FURTHER INVESTIGATION LED PROBLEM

Next: !p298, !f297

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: p1313, !f1304

RESISTANCE POTENTIOMETER TEMP FLOW

DISCONNECT MOLEX CONNECTOR J9 FROM PCB

Next: p1315, !f1314

GAS RATE

Next: p1316, !f1317

TEMPERATURE DIFFERENTIAL FLOW AND RETURN MK1

BOILER STAT TO MID RANGE

Next: !p1470, ?1320, ?1322

OBSERVATION DOES BOILER RESET

Next: p1458, f1435

OBSERVATION BOILER RESET NO PUMP

NO DEMANDS
DISCONNECT PUMP LIVE CONNECTIONS FROM MAIN WIRING CONNECTION BLOCK AND MAKE SAFE

Next: !p1456, f1439

FURTHER INVESTIGATION RED LOCKOUT

Next: !p1463, !f1464

FURTHER INVESTIGATION RED LOCKOUT MK1

Next: !p1496, !f1497

OBSERVATION BOILER RESET NO PUMP

NO DEMANDS
DISCONNECT PUMP LIVE CONNECTIONS FROM MAIN WIRING CONNECTION BLOCK AND MAKE SAFE

Next: !p1490, f1491

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: !p272, f18

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: p1595, f1590

GAS RATE

Next: !p1599, f1596

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: p1605, f1601

GAS RATE

Next: !p1609, f1606

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: p1624, f1627

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1625, !f1626

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: p1631, f1634

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1632, !f1633

INSPECTION HARNESS THERMISTOR

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: !p1638, !f1639

OBSERVATION DOES SPARKING OCCUR

REMOVING COMBUSTION DOOR

Next: p190, f1658

RESISTANCE FLOW SWITCH OPERATION

DISCONNECT THE WHITE

Next: p1661, f1662

INSPECTION AIR PRESSURE TUBES AND VENTURI

REMOVE VENTURI FROM FAN ASSEMBLY
REMOVE APS TUBES

Next: p1683, ?1685, ?1687

PUMP LIMPET TEST

Next: p1763, !f1670

VOLTAGE PUMP AT PUMP

Next: !p1667, !f1668

INSPECTION FLUE

Next: p1689, !f1690

INSPECTION FAN ASSEMBLY

REMOVE THE FAN ASSEMBLY FROM THE APPLIANCE.

Next: p1691, !f1692

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: p1693, !f1694

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1695, !f1696

RESISTANCE ELECTRODE SPARK

REMOVE THE IGNITION ELECTRODE

Next: p1697, !f1698

INSPECTION ELECTRODE SPARK GAP

Next: !p1699, !f1700

OBSERVATION DOES SPARKING OCCUR MK1

REMOVING COMBUSTION DOOR

Next: p1101, f1719

RESISTANCE FLOW SWITCH OPERATION MK1

DISCONNECT THE WHITE

Next: p1722, f1723

INSPECTION AIR PRESSURE TUBES AND VENTURI MK1

REMOVE VENTURI FROM FAN ASSEMBLY
REMOVE APS TUBES

Next: p1744, ?1746, ?1748

VOLTAGE PUMP AT PUMP

Next: !p1728, !f1729

INSPECTION FLUE

Next: p1750, !f1751

INSPECTION FAN ASSEMBLY MK1

REMOVE THE FAN ASSEMBLY FROM THE APPLIANCE.

Next: p1752, !f1753

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS) MK1

Next: p1754, !f1755

RESISTANCE ELECTRODE SPARK HARNESS MK1

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1756, !f1757

RESISTANCE ELECTRODE SPARK MK1

REMOVE THE IGNITION ELECTRODE

Next: p1758, !f1759

INSPECTION ELECTRODE SPARK GAP MK1

Next: !p1760, !f1761

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1764, !f1765

INSPECTION SYSTEM FILLED AND VENTED

Next: p1663, !f1772

INSPECTION SYSTEM FILLED AND VENTED

Next: p1774, !f1779

PUMP LIMPET TEST

Next: p1775, !f1776

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1777, !f1778

INSPECTION SYSTEM FILLED AND VENTED

Next: p1781, !f1782

PUMP LIMPET TEST

Next: p1783, !f1784

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1785, !f1786

INSPECTION SYSTEM FILLED AND VENTED

Next: p1788, !f1789

PUMP LIMPET TEST

Next: p1790, !f1791

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p1792, !f1793

PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

THERMOSTAT TURNED TO MAXIMUM
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: p1796, ?1798, ?1800

INSPECTION ELECTRODE AND GAP

Next: p1805, !f1804

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
APPLY CH DEMAND

Next: !p1803, !f1802

OBSERVATION SPARKING OUTPUT

Next: p1809, f1806

INSPECTION BURNER

Next: !p1810, !f1811

PRESSURE GAS BURNER (EXPLOSIVE IGNITION)

THERMOSTAT TURNED TO MAXIMUM
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: p1843, ?1845, ?1847

INSPECTION ELECTRODE AND GAP

Next: p1851, !f1852

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
APPLY CH DEMAND

Next: !p1849, !f1850

OBSERVATION SPARKING OUTPUT

Next: p1853, f1854

INSPECTION BURNER

Next: !p1857, !f1858

PRESSURE GAS INLET DROP

APPLY CH DEMAND
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p205, ?1935, ?1937

VOLTAGE GAS VALVE (AT VALVE)

Next: !p1940, f1941

VOLTAGE GAS VALVE (AT VALVE) MK1

Next: !p1954, f1955

INSPECTION BURNER

Next: p207, !f206

INSPECTION ELECTRODE AND GAP

Next: !p209, !f208

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT
APPLY CH DEMAND

Next: p212, !f1933

VOLTAGE RECTIFICATION

Next: !p1275, f248

INSPECTION BURNER

Next: p251, !f252

INSPECTION FLUE

Next: !p253, !f254

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p277, !f278

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: p302, !f280

GAS RATE

Next: p303, !f304

TEMPERATURE DIFFERENTIAL FLOW RETURN

BOILER STAT TO MID RANGE

Next: !p305, ?307, ?309

DID BURNER BAFFLE OR ROLL DOWN OR LIFT OFF

Next: p348, f355

INSPECTION FAN MECHANICAL

REMOVE FAN

Next: p350, !f349

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: p352, !f351

INSPECTION FLUE

Next: !p354, !f353

INSPECTION COMBUSTION CHAMBER

REMOVE COMBUSTION CHAMBER COVER

Next: !p361, !f360

PUMP LIMPET TEST

Next: p400, !f401

GAS INLET PRESSURE

APPLY CH DEMAND
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1589, !f497

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p402, !f403

RESISTANCE SENSOR TEMP FLOW

DISCONNECT THE YELLOW LEADS FROM PRIMARY SENSOR

Next: p422, !f405

GAS RATE

Next: p423, !f424

TEMPERATURE DIFFERENTIAL FLOW RETURN

BOILER STAT TO MID RANGE

Next: !p425, ?427, ?429

VOLTAGE BOILER SWITCHED LIVE OPERATION REFIRE

THERMOSTAT TO OFF POSITION

Next: p515, !f492

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: !p456, f453

RESISTANCE OVERHEAT STAT AT TEMP

ALLOW APPLIANCE TO FIRE AND SYSTEM TO HEAT UNTIL BOILER SHUTS DOWN

Next: !p483, !f479

TEMPERATURE SYSTEM FLOW

BOILER STAT SET TO MID RANGE

Next: p1623, f516

EXPANSION VESSEL PRESSURE

SYSTEM DISCHARGED

Next: !p528, !f529

GAS BURNER SHUT DOWN

APPLY CH DEMAND

Next: !p580, f581

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

DISCONNECT THE 4 PIN CONNECTOR WITH YELLOW LEADS FROM THE PCB

Next: p1637, f577

FAN RUNS

Next: p13, f14

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