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:

BAXI MEGAFLO SYSTEM ERP / POTTERTON PROMAX SYSTEM ERP

GLOBALLY REPLACED

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

CASE OFF

OUTER CASE REMOVA

Next: &1045, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &7, !f4

FAULT CODES

FAULT CODES

Next: &105, !f8

DOES FAN RUN ON CH DEMAND

{SELHWCHON}

Next: &334, ?2456, ?2468

BURNER IGNITES AND ESTABLISHES

{SELHWCHON}

Next: &248, ?186, ?188, ?190, ?192, ?1855

OPERATION CH

{SELHWCHON}
TEMPERATURE CONTROL SET TO MAX

Next: &357, ?251, ?255, ?257, ?2306, ?2322

DOES PUMP RUN ON CH DEMAND

Next: &185, f2547

OPERATION DHW

EXTERNAL DHW CONTROLS CALLING FOR HEAT

Next: &nff, ?422, ?2328

OVERHEAT INVESTIGATION

OUT OF MODEL

Next: &nff, f438

E20 FAULT CODE

OUT OF MODEL

Next: &nff, f585

E50 FAULT CODE

OUT OF MODEL

Next: &nff, f591

E119 FAULT CODE

OUT OF MODEL

Next: &nff, f598

E125 FAULT CODE

OUT OF MODEL

Next: &nff, f628

E130 FAULT CODE

OUT OF MODEL

Next: &nff, f2608

E160 FAULT CODE

OUT OF MODEL

Next: &nff, f721

FUSE FURTHER INVESTIGATION

OUT OF MODEL

Next: &nff, f806

E168 FAULT CODE

E168 FAULT CODE
T

Next: &nff, f1615

E156 FAULT CODE

Next: &nff, !f1022

POWER UP

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &1093, ?1465, ?1467

BOILER ENTERS STANDBY MODE

{SELHWCHON}
ENSURE THERE ARE NO DEMANDS

Next: &3, ?1094, ?1098, ?1368

E164 FAULT CODE

OUT OF MODEL

Next: &nff, f1176

E28 FAULT CODE

NOT USED - HEADER FOR FAULT CODE

Next: &nff, f2520

E130 FAULT CODE DURING CH OPERATION

HEADER FOR FAULT CODE E130 DURING CH OPERATION

Next: &nff, f2594

SF OR P CALIBRATION FUNCTION

INTENTIONALLY BLANK - HEADER FOR SERVICE MODE

Next: &nff, f2640

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f2644

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f2646

HEADER FOR QADAI FLOW THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2648

HEADER FOR QADAI RETURN THERMISTOR

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2652

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2656

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2660

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2664

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2668

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2672

HEADER FOR QADAI FAN AC VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2676

HEADER FOR QADAI FAN AC RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f2680

HEADER FOR QADAI FLUE THERMISTOR

Next: &nff, f2684

E156

MAINS VOLTAGE LESS THAN 180VAC

Next: End

OPEN CIRCUIT

CABLE - ELECTRODE - FLAME SENSING

Next: End

NO AC VOLTAGESTANDY BY MODE

WIRING - FAN/IGNITER

Next: End

FAN SUPPLY DC

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO FAN DC

PCB

Next: End

NO PRESSURE E119E164

SYSTEM PRESSURE

Next: End

BLOCKED E119E164

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

E164

PUMP

Next: End

STANDBY

FAN ASSEMBLY

Next: End

BLOWN STAND BY MODE AT POWER UPB4 OP SEQ

FUSE 3AMP

Next: End

BLOWN STANDBY MODE AT POWER UPFAN DOESNT RUNB4 OP SEQ

FUSE 2 AMP (LIVE)

Next: End

BLOWNB4 OP SEQ

FUSE 2 AMP (NEUTRAL)

Next: End

ERRATIC TEMPERATURE DISPLAY

SENSOR - NTC (PRIMARY)

Next: End

NOT RESPOND TO DC FROM FANE160

PCB

Next: End

NO PERMANENT VOLTAGE TO FAN

PCB

Next: End

FAN NOT RUNNING

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NOT RESPONDING TO FAN

PCB

Next: End

FAN NOT RUNNING E160

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO PERMANENT VOLTAGE TO FAN E160

PCB

Next: End

NOT RESPONDING TO FAN E160

PCB

Next: End

E168

GAS VALVE

Next: End

E125 FAULT CODE

TAP - ISOLATION - RETURN (FILTER)

Next: End

OPERATION DHW - DHW COOL RADS COOL

PUMP

Next: End

BLOCKED

PIPE - PRESSURE SWITCH

Next: End

EXPLOSIVE IGNITIOJN

GAS INLET PRESSURE

Next: End

EXPLOSIVE IGNITION

LEAD - IGNITION ELECTRODE

Next: End

EXPLOSIVE IGNITION

BODY - CONDENSER SIPHON/PRIMER

Next: End

EXPLOSIVE IGNITION

FLUE

Next: End

EXPLOSIVE IGNITION

ELECTRODE - IGNITION

Next: End

EXPLOSIVE IGNITION

BURNER

Next: End

EXPLOSIVE IGNITION

HEAT EXCHANGER - BASIC

Next: End

EXPLOSIVE IGNITION

FAN - PRESSURE SENSING VENTURI

Next: End

EXPLOSIVE IGNITION

PIPE - PRESSURE SWITCH

Next: End

GAS VALVE DAMAGED PCB

PCB AND GAS VALVE

Next: End

BURNER DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

FAULTY SOLENOIDS

GAS VALVE

Next: End

BURNER DOES NOT IGNITE - NO DROP

FLUE

Next: End

BLOCKEDBLOCKED

BODY - CONDENSER SIPHON/PRIMER

Next: End

BURNER DOES NOT IGNITE - DROP

FLUE

Next: End

SPARKING WRONG POSITION

ELECTRODE - IGNITION

Next: End

CHOKEDBLOCKED

BURNER

Next: End

BURNER DOES NOT IGNITEBLOCKED

HEAT EXCHANGER - BASIC

Next: End

BLOCKED OR RESTRICTED

FAN - PRESSURE SENSING VENTURI

Next: End

NO RECTIFICATION VOLTAGE

PCB

Next: End

NO DROP

FAN - PRESSURE SENSING VENTURI

Next: End

NO SPARK

WIRING - FAN/IGNITER

Next: End

NO POWER TO SPARK GEN

PCB

Next: End

NO SPARKING

LEAD - IGNITION ELECTRODE AND EARTH

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

NO SPARKING WITH LEAD

PCB

Next: End

NOT ESTABLISHING

BODY - CONDENSER SIPHON/PRIMER

Next: End

BURNER BAFFLES OUT

GAS INLET PRESSURE

Next: End

BLOCKED 2

BODY - CONDENSER SIPHON/PRIMER

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

NO AC VOLTAGESTANDY BY MODE BLANK DISPLAY

WIRING - FAN/IGNITER

Next: End

FAN NOT RUNNING BLANK DISPLAY

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO PERMANENT VOLTAGE TO FAN BLANK DISPLAY

PCB

Next: End

NOT RESPONDING TO FAN BLANK DISPLAY

PCB

Next: End

BLACK DISPLAYB4 OP SEQ

FAN ASSEMBLY

Next: End

FAN SUPPLY DC BLANK DISPLAY

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO FAN DC BLANK DISPLAY

PCB

Next: End

STANDBY BLANK DISPLAY

FAN ASSEMBLY

Next: End

LED AT POWER UPB4 OP SEQ

PCB

Next: End

BURNER BAFFLES OUT

FLUE

Next: End

FROST PROTECTION

SENSOR - NTC (PRIMARY)

Next: End

CH NO DEMAND

PCB

Next: End

HW+CHFROST STANDBY MODE

PCB

Next: End

DHW COOL RADS COOL

SENSOR - NTC (PRIMARY)

Next: End

DHW COOL RADS COOL

CLIP - NTC RETURN SENSOR

Next: End

POOR DHW

BURNER

Next: End

OPERATION DHW - DHW COOL RADS COOL - FLUEWAYS

HEAT EXCHANGER - BASIC

Next: End

OPERATION DHW - DHW COOL RADS COOL

FLUE

Next: End

SENSOR FAULT - RADS TOO HOT

SENSOR - NTC (PRIMARY)

Next: End

SENSOR FAULT (RETURN) - RADS TOO HOT

CLIP - NTC RETURN SENSOR

Next: End

NOT RUNNING - POWER IN - BOILER NOISY

PUMP

Next: End

BYPASS FAULT - BOILER NOISY

Next: End

BYPASS PASSING - BOILER NOISY

KIT - BY-PASS-CH

Next: End

BOILER SHUTS DOWN BEFORE REACHING TEMP

CLIP - NTC RETURN SENSOR

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR - NTC (PRIMARY)

Next: End

OPERATION CH - NOISY

TAP - ISOLATION - RETURN (FILTER)

Next: End

CLOSED

FLOW AND RETURN VALVES

Next: End

UNDER PRESSURE

EXPANSION VESSEL

Next: End

RADS COOL

PUMP

Next: End

BYPASS FAULT - BOILER UP TO TEMP RADS COLD

Next: End

BYPASS PASSING - BOILER UP TO TEMP RADS COLD

KIT - BY-PASS-CH

Next: End

FILTER BLOCKED - BOILER UP TO TEMP RADS COLD

TAP - ISOLATION - RETURN (FILTER)

Next: End

OVERHEAT DHW DIFF OK

TAP - ISOLATION - RETURN (FILTER)

Next: End

E168

SPARK GENERATOR

Next: End

E168 AC

FAN ASSEMBLY

Next: End

E168 DC

FAN ASSEMBLY

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

SENSOR - NTC (PRIMARY)

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE168

THERMOSTAT - LIMIT

Next: End

E168

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSUREE168

SYSTEM PRESSURE

Next: End

BLOCKEDE168

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

E168

ELECTRODE - IGNITION

Next: End

E168

ELECTRODE - IONISATION

Next: End

NO DISPLAY NO FANSTANDY BY MODE

PCB

Next: End

NO DISPLAY

WIRING - CONNECTOR

Next: End

NO RESET OVERHEAT

SWITCH - SELECTOR - 4 POSITION

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANOH

THERMOSTAT - LIMIT

Next: End

FAN RUNS CH DEMAND

HARNESS X6 LINK

Next: End

NO CH 2

PCB

Next: End

FAN DOES NOT RUN

PCB

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

SENSOR - NTC (PRIMARY)

Next: End

SENSOR FAULT (RETURN) - FAN RUNS

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSURE

SYSTEM PRESSURE

Next: End

BLOCKED

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFAN

THERMOSTAT - LIMIT

Next: End

SHUTS DOWN BEFORE REACING TEMP

PUMP

Next: End

SENSOR FAULT (OVERHEAT) - SHUTS DOWN BEFORE TEMP

THERMOSTAT - LIMIT

Next: End

SENSOR FAULT (FLUE) - SHUTS DOWN BEFORE TEMP

DEVICE - SAFETY - FLUE

Next: End

E28

DEVICE - SAFETY - FLUE

Next: End

NO DEMAND LED - EXT VOLTS IN

WIRING - PUMP & GAS VALVE

Next: End

NO DEMAND LED

SWITCH - SELECTOR - 4 POSITION

Next: End

OBSERVATION PUMP RUNS

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB OVERHEAT

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP OVERHEAT

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS OVERHEAT

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS E125

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E125

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E125

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS E125

RELAY - PCB

Next: End

OBSERVATION PUMP RUNS E164

PCB

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP PCB E164

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS - OPEN TO PUMP E164

WIRING - PUMP & GAS VALVE

Next: End

OBSERVATION PUMP RUNS E164

RELAY - PCB

Next: End

PUMP SECTION CAUSING E168

WIRING - PUMP & GAS VALVE

Next: End

FUSE2

WIRING - PUMP & GAS VALVE

Next: End

FAN RUNSNO SUPPLY VOLTAGEFAN

DEVICE - SAFETY - FLUE

Next: End

DOES FAN RUN ON DHW DEMAND

SWITCH - AIR PRESSURE

Next: End

OPERATION DHW - FAULT CODE

DEVICE - SAFETY - FLUE

Next: End

OPERATION DHW - FAULT CODE - NO APS

PCB

Next: End

OPERATION DHW - FAULT CODE

SWITCH - AIR PRESSURE

Next: End

OPERATION DHW - FAULT CODE - FLUEWAYS

HEAT EXCHANGER - BASIC

Next: End

NO RESET E130

SWITCH - SELECTOR - 4 POSITION

Next: End

FAN RUNSNO SUPPLY VOLTAGEFANE130

DEVICE - SAFETY - FLUE

Next: End

E130

SWITCH - AIR PRESSURE

Next: End

E130

BODY - CONDENSER SIPHON/PRIMER

Next: End

CHOKEDBLOCKEDE130

BURNER

Next: End

BURNER DOES NOT IGNITEBLOCKEDE130

HEAT EXCHANGER - BASIC

Next: End

FAN RUNSNO SUPPLY VOLTAGEFANE168

DEVICE - SAFETY - FLUE

Next: End

E168

SWITCH - AIR PRESSURE

Next: End

FAN RUNSNO SUPPLY VOLTAGEFANE130 E131

DEVICE - SAFETY - FLUE

Next: End

STUCK IN CALIBRATION MODE

PCB

Next: End

BLANK FOR LITE DIAGNOSTIC

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLANK FOR QADAI

Z DIRECTION CHOICE OR CONTINUE

Next: End

QADAI

SENSOR - NTC (PRIMARY)

Next: End

QADAI

CLIP - NTC RETURN SENSOR

Next: End

QADAI

GAS VALVE

Next: End

QADAI NO POWER TO GAS VALVE

PCB

Next: End

QADAI

SPARK GENERATOR

Next: End

QADAI

PUMP

Next: End

QADAI NO POWER TO PUMP

RELAY - PCB

Next: End

QADAI NO POWER TO FAN AC

PCB

Next: End

QADAI AC

FAN ASSEMBLY

Next: End

QADAI

DEVICE - SAFETY - FLUE

Next: End

FLAME BAFFLES

HEAT EXCHANGER - BASIC

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

F5 FAULT CODE

PUMP

Next: End

OVERHEAT

CLIP - NTC RETURN SENSOR

Next: End

OVERHEAT

SENSOR - NTC (PRIMARY)

Next: End

LOW TEMP

GAS INLET PRESSURE

Next: End

FAN RUNS DHWNO SUPPLY VOLTAGEFANE20

SENSOR - NTC (PRIMARY)

Next: End

NO FANNO SUPPLY VOLTAGEFANE50

CLIP - NTC RETURN SENSOR

Next: End

NO PRESSURE E119

SYSTEM PRESSURE

Next: End

BLOCKED E119

SWITCH - PRESSURE - HEATING (WATER PRESSURE)

Next: End

E125

PUMP

Next: End

E125

SENSOR - NTC (PRIMARY)

Next: End

E125

CLIP - NTC RETURN SENSOR

Next: End

NO RESET

SWITCH - SELECTOR - 4 POSITION

Next: End

NOISY

BODY - CONDENSER SIPHON/PRIMER

Next: End

E160

WIRING - FAN/IGNITER

Next: End

E160

PCB

Next: End

E160

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO DC SUPPLY TO FANE160

PCB

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN SIGNAL E160

FAN ASSEMBLY

Next: End

FUSE FURTHER INVESTIGATION

GAS VALVE

Next: End

DC HARNESS

FAN ASSEMBLY

Next: End

FUSE BLOWING

FAN ASSEMBLY

Next: End

WATER PRESSURE E119

WIRING - DHW PRIORITY SENSOR

Next: End

FAULTY

ELECTRODE - IONISATION

Next: End

NO RETIFICATION

PCB

Next: End

E119 FAULTE164

PCB

Next: End

WATER PRESSURE E119E164

WIRING - DHW PRIORITY SENSOR

Next: End

NO FAN SUPPLY SPEED

PCB

Next: End

DHW

FROST PROTECTION

Next: End

SUPPLY FAULT AT POWER UPB4 OP SEQ

Next: End

FURTHER INVESTIGATION F1B4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER IN VESTIGATION F2FAN DOESNT RUNB4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION F3B4 OP SEQ

Z DIRECTION CHOICE OR CONTINUE

Next: End

ERRATIC TEMPERATURE DISPLAY

PCB

Next: End

ERRATIC TEMPERATURE DISPLAY

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

RUNNING SLOW

FAN ASSEMBLY

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE

FAN ASSEMBLY

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE E160

FAN ASSEMBLY

Next: End

E168 GAS VALVE

WIRING - PUMP & GAS VALVE

Next: End

RESTRICTEDE125

HEAT EXCHANGER - BASIC

Next: End

EXPLOSIVE IGNITION

GAS VALVE

Next: End

SPARKING NO IGNITION

GAS INLET PRESSURE

Next: End

NO GV VOLTAGE

PCB

Next: End

GAS VALVE HARNESS DAMAGED PCB

PCB AND GAS VALVE HARNESS

Next: End

GV VOLTAGEPASS

WIRING - PUMP & GAS VALVE

Next: End

MECHANICALPASS

GAS VALVE

Next: End

NOT OPENING RESISTANCE OK

GAS VALVE

Next: End

EXPLOSIVE IGNITION

SPARK GENERATOR

Next: End

SPARKING OCCURS

ELECTRODE - IGNITION

Next: End

NO SPARK - RESISTANCE

SPARK GENERATOR

Next: End

NO SPARK

SPARK GENERATOR

Next: End

NO FANB4 OP SEQ

SWITCH - SELECTOR - 4 POSITION

Next: End

VOLTAGE NO MOVEMENTSTANDY BY MODE BLANK DISPLAY

FAN ASSEMBLY

Next: End

FLAME BAFFLING

GAS VALVE

Next: End

BLANK DISPLAYB4 OP SEQ

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NO FAN SUPPLY SPEED BLANK DISPLAY

PCB

Next: End

FURTHER INVESTIGATION LED PCB FAULT TO FAN RUNS BURNER IGNITES AND ESTABLISHESB4 OP SEQ

Z REDIRECTS BY HTML LINK

Next: End

FIRING NO DEMAND

Next: End

NO DEMAND

KIT - ELECTRO/MECHANICAL

Next: End

DHW COOL RADS COOL

PCB

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

CH OPERATION NOISY

HEAT EXCHANGER - BASIC

Next: End

CH OPERATION NOISEY

Next: End

EXPANSION CONNECTION

PIPE - EXCHANGER (BLOCKAGE TO EXPANSION VESSEL)

Next: End

NO SUPPLY

Next: End

OPERATION DHW

Next: End

BLOCKAGE - RESTRICTION - AIR

Next: End

PCB FUSE BLOWING

FUSE GONE PCB

Next: End

1F5FAULT 2 DHW DIFF OK

Next: End

OVERHEAT

TEMPERATURE OVERHEAT

Next: End

EXCESSIVE TEMP

PCB

Next: End

CUTTING OFF

THERMOSTAT - LIMIT

Next: End

E168 IGNITER

WIRING - FAN/IGNITER

Next: End

E168 AC

WIRING - FAN/IGNITER

Next: End

E168 FAN DC

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

PRIMARYNO SUPPLY VOLTAGEFANE168

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

OH STATE168

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

DHW SENSORNO SUPPLY VOLTAGEFANE168

WIRING - DHW PRIORITY SENSOR

Next: End

WATER PRESSURE SWITCHE168

WIRING - DHW PRIORITY SENSOR

Next: End

NOT RECONISING DEMANDE168

PCB

Next: End

NO DISPLAY NO FANB4 OP SEQ

PCB

Next: End

NO DISPLAY

WIRING - CONNECTOR / SELECTOR SWITCH

Next: End

BOILER WONT RESET

PCB

Next: End

OH STATOH

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

FAN DOES NOT RUN NO DEMAND LED

PCB

Next: End

NO CH

PCB

Next: End

NO SWITCH BACK

KIT - ELECTRO/MECHANICAL

Next: End

PRIMARYNO SUPPLY VOLTAGEFAN

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

FAN DOES NOT RUN - RETURN SENSOR

WIRING - DHW PRIORITY SENSOR

Next: End

WATER PRESSURE SWITCH

WIRING - DHW PRIORITY SENSOR

Next: End

LOCKOUT RESET (FAN RUNS)

PCB

Next: End

OH STAT

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

PCB - SHUTS DOWN BEFORE TEMP

PCB

Next: End

E28

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

E28

PCB

Next: End

FAN RUNS CH DEMAND

Next: End

FAN DOES NOT RUN NO DEMAND LED

WIRING - CONNECTOR / SELECTOR SWITCH

Next: End

OBSERVATION PUMP RUNS

PUMP

Next: End

OBSERVATION PUMP RUNS OVERHEAT

PUMP

Next: End

OBSERVATION PUMP RUNS E125

PUMP

Next: End

OBSERVATION PUMP RUNS E164

PUMP

Next: End

E168

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

FLUE STAT

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

OPERATION DHW - FAULT CODE

FLUE

Next: End

NO RESETE130

PCB

Next: End

E130

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

E130

FLUE

Next: End

FLUE STATE168

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

E130 E131

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

NORMAL OPERATION

CALIBRATION FUNCTION

Next: End

SENSOR TEMP FLOW

RESULT AS EXPECTED

Next: End

SENSOR TEMP RETURN

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

PCB POWER TO GAS VALVE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO PUMP

RESULT AS EXPECTED

Next: End

PCB POWER TO FAN AC

RESULT AS EXPECTED

Next: End

FAN AC

RESULT AS EXPECTED

Next: End

SENSOR FLUE

RESULT AS EXPECTED

Next: End

PRIMARYNO SUPPLY VOLTAGEFANE20

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

E20

PCB

Next: End

DHW SENSORNO SUPPLY VOLTAGEFANE50

WIRING - DHW PRIORITY SENSOR

Next: End

E50

PCB

Next: End

E119 FAULT

PCB

Next: End

NO RESET

PCB

Next: End

ALL OKAY

BOILER LOCKOUT

Next: End

FUSE

HARNESS - WIRING - FAN/DHW, THERMOSTAT/PRESSURE SWITCH

Next: End

FUSE GAS VALVE

WIRING - PUMP & GAS VALVE

Next: End

FUSE

WIRING - FAN/IGNITER

Next: End

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1095

FAN DOES NOT RUN ON SELF CHECK

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1099

DHW / CH DEMAND LED ILLUMINATED

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1430

DISPLAY DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM POWER UP

Next: p1469

DISPLAY ILLUMINATES BUT TEMPERATURE DISPLAYED ERRATIC

CHARACTERISTIC TEST FROM POWER UP

Next: p1516

EXPLOSIVE OR DELAYED IGNITION

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p1899

SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p1811

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p1972

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p191

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p193

GAS INLET PRESSURE LOW OR DROPS BELOW MINIMUM

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p1941

GAS INLET PRESSURE OK BUT DOES NOT DROP

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p1943

FAN RUNS CONTINUOUSLY AT HIGH SPEED

CHARACTERISTIC TEST FROM FAN RUNS SELF CHECK

Next: p2081

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS SELF CHECK

Next: p2083

TEMP DIFFERENTIAL NOT OK LOCAL BOILING

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

Next: !p2303

DIFFERENTIAL OK SYSTEM NOISE

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

Next: !p2305

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2307

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2323

BOILER RESPONDS TO DHW DEMAND BUT OPERATION UNSATISFACTORY

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p2329

BOILER TEMPERATURE EXCEEDS 90 DEGREES AND DOES NOT CUT OFF

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2354

BOILER LOCKS OUT ON OVERHEAT BEFORE REACHING 85 DEGREES

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: !p2356

FAN DOES NOT RUN AND DEMAND LED IS NOT ILLUMINATED

CHARACTERISTIC TEST FROM DOES FAN RUN ON CH DEMAND

Next: p2457

FAN DOES NOT RUN BUT DEMAND LED IS ILLUMINATED

CHARACTERISTIC TEST FROM DOES FAN RUN ON CH DEMAND

Next: p2469

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p252

BOILER NOISY / KETTLING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p256

BOILER SHUTS DOWN BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p2494

BOILER DOES NOT RESPOND TO DHW DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p2327

27/06/2022 15:33:53 2205_1_50_1 20/10/2022 11:11:26

23/08/2022 14:31:22

Next: End

RESISTANCE DETECTION LEAD

REMOVE BOTH ENDS OF THE FLAME SENSE HARNESS, FROM THE ELECTRODE AND FROM X501 ON THE PCB

Next: !p1027, !f1026

SYSTEM PRESSURE CHECK

Next: p1183, !f1178

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p1181, !f1182

RESISTANCE FUSE F1 (FUSED SPUR)

Next: !p1472, f1473

FUSE FURTHER INVESTIGATION F1

Next: !p1474, !f1475

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE CONTROL BOX COVER
REMOVE THE FUSE AND HOLDER FROM THE LIVE (BROWN)

Next: p1478, f1479

FUSE FURTHER INVESTIGATION F2

Next: !p1480, !f1481

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p1519, !f1520

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p1616, f1617

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2584, !f2583

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1622, !f1623

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p1745, !f1746

RESISTANCE ELECTRODE LEAD

REMOVE SPARK AND EARTH LEADS FROM ELECTRODE AND SPARK GENERATOR

Next: !p1971, !f1905

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: !p1946, f1947

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1948, !f1949

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p1952, !f1953

RESISTANCE SPARK GENERATOR AND LEADS

REMOVE SPARK LEAD AND EARTH WIRE FROM ELECTRODE

Next: p1991, f1986

RESISTANCE ELECTRODE LEAD

REMOVE SPARK AND EARTH LEADS FROM ELECTRODE AND SPARK GENERATOR

Next: !p1989, !f1997

VOLTAGE SELECTOR SWITCH

{SELHWCHON}

Next: !p2405, f2087

VOLTAGE SELECTOR SWITCH INPUT

Next: !p2088, !f2406

RESISTANCE FAN (DC)_FUSE

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p2100, !f2101

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p2111, !f2112

VOLTAGE FROM SWITCH LIVE

{SELHWCHON}
NO DEMANDS FOR CH
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2115, !f2116

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2349, !f2350

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p2360, !f2361

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2364, !f2365

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p2368, !f2369

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p2372, !f2373

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p2380, !f2381

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2384, !f2385

SYSTEM PRESSURE CHECK

Next: p2388, !f2389

VOLTAGE MAINS IN AT PCB

Next: !p2404, f2085

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p2451, !f2452

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p2454, !f2455

LINK FITTED ON PCB PLUG X9

REMOVE THE COVER FROM THE PCB AND LOCATE PLUG X9
(RIGHT HAND SIDE OF THE PCB)

Next: !p2462, !f2463

VOLTAGE TO INTEGRAL TIMER

{SELHWCHON}

Next: !p2466, !f2467

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p2474, !f2475

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2478, !f2479

SYSTEM PRESSURE CHECK

Next: p2482, !f2483

RESISTANCE SENSOR OVERHEAT STAT

UNPLUG THE LEAD FROM THE OVERHEAT STAT

Next: !p2492, !f2493

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2524, f2521

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2522, !f2523

VOLTAGE TERMINAL BLOCK INTO EXTERNAL CONTROLS

{SELHWCHON}

Next: !p2526, f2543

RESISTANCE SELECTOR SWITCH (EXTERNAL CONTROLS)

DISCONNECT TOP TWO LEFT LEADS FROM SELECTOR SWITCH (BROWN AND BLACK)

Next: !p2546, !f2545

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2548, !f2549

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2557, !f2558

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2566, !f2567

VOLTAGE CONTROL PCB TO PUMP PCB

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2575, !f2576

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2589, !f2590

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2595, !f2596

BOILER RESET

Next: p2609, f2610

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: p2611, !f2612

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2615, !f2616

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: p2626, !f2627

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2638, !f2635

OBSERVATION CAN CALIBRATION FUNCTION BE DISABLED

Next: !p2641, !f2642

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p2649, !f2650

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p2653, !f2654

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p2657, !f2658

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HEATING AND HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2661, !f2662

RESISTANCE IGNITER

REMOVE THE FLAME IGNITION HARNESS FROM THE SPARK GENERATOR

Next: !p2665, !f2666

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: !p2669, !f2670

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2673, !f2674

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p2677, !f2678

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p2681, !f2682

RESISTANCE SENSOR FLUE OVERHEAT STAT

REMOVE THE FLUE SENSOR FROM THE TOP OF THE HEAT EXCHANGER
(TWIST BAYONET FITTING)

Next: !p2685, !f2686

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2424, f2453

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p589, f586

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: !p587, !f588

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p595, f592

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: !p593, !f594

SYSTEM PRESSURE CHECK

Next: p606, !f600

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p1001, !f614

BOILER RESET

Next: p642, f655

RESISTANCE SELECTOR SWITCH (RESET)

{SELHWCHON}
REMOV

Next: !p656, !f657

IS FAN RUNNING

{SELHWCHON}

Next: p722, f723

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p791, !f792

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p807, f808

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p831, !f810

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: !p2587, !f2585

RESISTANCE FAN DC

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p830, !f818

RESISTANCE AC FAN

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN

Next: !p896, !f897

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1114, !f1115

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1100, !f2397

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1539, !f1107

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1116, !f1117

VOLTAGE DC FAN SPEED ON START UP

Next: !p1306, !f1307

VOLTAGE DC FAN DEMAND START-UP

Next: !p1549, !f1550

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p1179, f1180

DOES PUMP RUN ON CH DEMAND

Next: p1189, f2574

PUMP LIMPET TEST

Next: p1177, !f1201

IS BOILER TEMP LOW

Next: !p1431, f2110

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p1470, f1471

VOLTAGE AT PCB MAINS

REMOVE CONTROL BOX COVER

Next: p2078, f1477

FUSE FURTHER INVESTIGATION F3

Next: !p1482, !f1483

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: !p1517, f1518

VOLTAGE DC PCB SPEED REQUEST

Next: !p1525, !f1526

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1543, !f1548

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1158, !f1547

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p1552, !f1553

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1554, !f1555

VOLTAGE DC PCB SPEED REQUEST

Next: !p1556, !f1557

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p2357, f1621

PUMP LIMPET TEST

Next: p2249, !f1753

COMPENSATION TUBE BLOCKED OR DAMAGED

Next: p1938, !f1813

GAS INLET PRESSURE

{SELHWCHON}
SET T

Next: p1900, !f1901

CAN SPARKING BE SEEN (EXPLOSIVE IGN)

{SELHWCHON}
REMOV

Next: p1916, f1903

INSPECTION CONDENSATE PIPE

Next: p1906, !f1907

INSPECTION FLUE

Next: p1908, !f1909

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p1910, !f1911

GAS INLET PRESSURE

{SELHWCHON}
SET T

Next: p202, !f203

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1912, !f1913

INSPECTION HEAT EXCHANGER

Next: p1929, !f1915

COMPENSATION TUBE BLOCKED OR DAMAGED

Next: p1902, !f1932

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p1931, !f1930

GAS INLET PRESSURE

{SELHWCHON}
SET T

Next: p2001, !f195

PRESSURE GAS INLET AND DROP

{SELHWCHON}
SET D

Next: p1939, ?1940, ?1942

INSPECTION CONDENSATE PIPE

Next: p1956, !f1957

VOLTAGE RECTIFICATION ON PCB

{SELHWCHON}
REMOVE THE FLAME SENSE LEAD FROM TERMINAL X501

Next: p196, !f197

GAS VALVE VOLTAGE (PCB)

SELECTOR SWITCH TO HEATING AND HOT WATER
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1944, f1945

RESISTANCE GAS VALVE AND SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X3 FROM PCB

Next: p1950, f1951

INSPECTION FLUE

Next: p1968, !f1955

INSPECTION FLUE

Next: p1958, !f1959

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p1960, !f1961

FLAME SENSE VOLTAGE AT PCB

{SELHWCHON}

Next: !p1028, f1024

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1962, !f1963

INSPECTION HEAT EXCHANGER

Next: p1964, !f1965

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p1966, !f1967

INSPECTION PRESSURE SENSING VENTURI

REMOVE THE COMPENSATION TUBE FROM THE FAN ASSEMBLY

Next: !p1969, !f1970

CAN SPARKING BE SEEN

{SELHWCHON}
REMOV

Next: !p1973, f1979

RESISTANCE SPARK GENERATOR HARNESS

REMOVE CONNECTOR FROM SPARK GENERATOR
REMOVE CONNECTOR X2 FROM THE PCB

Next: p1994, !f1992

VOLTAGE SPARK GENERATOR

{SELHWCHON}
GAIN

Next: p1998, !f1995

VOLTAGE SPARK GENERATOR WITH LEAD

{SELHWCHON}
GAIN

Next: !p1999, !f2000

INSPECTION CONDENSATE PIPE

Next: p194, !f2009

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p653, f2630

INSPECTION CONDENSATE PIPE

Next: p204, !f205

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p206, !f207

INSPECTION HEAT EXCHANGER

Next: p208, !f305

FAN RUNS SELF CHECK

Next: p2079, ?2080, ?2082

FURTHER INVESTIGATION DISPLAY PROBLEM

Next: !p2108, !f2109

INSPECTION FLUE

Next: !p210, !f211

REMOVE FAN CONNECTOR DOES DISPLAY NOW WORK

REMOVE CONNECTOR X401 FROM PCB

Next: p2098, f2099

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2084, f2398

RESISTANCE FAN HARNESS AC

REMOVE THE 3 WIRE CONNECTOR FROM THE FAN ASSEMBLY
REMOVE CONNECTOR X2 FROM THE PCB

Next: p2090, !f2091

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p2092, !f2093

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2094, !f2095

VOLTAGE DC FAN DEMAND START-UP

Next: !p2096, !f2097

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p2102, !f2103

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2104, !f2105

VOLTAGE DC FAN SPEED ON START UP

Next: !p2106, !f2107

IS INTEGRAL TIMER FITTED

Next: p2113, f2114

IS VOLTAGE PRESENT FROM INTEGRAL TIMER

{SELHWCHON}
GAIN

Next: !p2117, !f2118

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p2250, !f2251

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2252, !f2253

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2254, !f2255

INSPECTION HEAT EXCHANGER

Next: p2256, !f2257

INSPECTION FLUE

Next: !p2258, !f2259

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p2261, !f2262

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2265, !f2266

PUMP LIMPET TEST

Next: p2269, !f2270

BYPASS

GLOBALLY REPLACED

Next: p2273, !f2274

AUTO BYPASS VALVE

EXTERNAL CONTROLS CA

Next: p2297, !f2276

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: p2298, !f2299

TEMPERATURE DIFFERENTIAL FLOW RETURN

Next: !p2300, ?2302, ?2304

INSPECTION FLOW AND RETURN VALVES

Next: p2330, !f2309

EXPANSION VESSEL PRESSURE

BOILER DISCHARGED

Next: !p2324, !f2325

PUMP LIMPET TEST

Next: p2332, !f2331

BYPASS

GLOBALLY REPLACED

Next: p2333, !f2334

AUTO BYPASS VALVE

EXTERNAL CONTROLS CA

Next: p2335, !f2336

INSPECTION RETURN FILTER

DRAIN BOILER HEATING CIRCUIT

Next: !p2337, !f2338

TEMPERATURE DIFFERENTIAL CH

{SELHWCHON}
TURN

Next: p2347, f2348

CH TEST OVERHEAT

{SELHWCHON}
TURN

Next: !p2351, ?2353, ?2355

RESISTANCE IGNITER AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: p2358, f2359

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: p2362, f2363

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p2366, f2367

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2370, f2371

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2374, f2625

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2378, f2379

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2382, f2383

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2386, f2387

INSPECTION ELECTRODE SPARK GAP

REMOVE THE BURNER ASSEMBLY FROM THE BOILER

Next: p2392, !f2393

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p2390, !f2391

INSPECTION DETECTION ELECTRODE

REMOVE DETECTION ELECTRODE FROM BURNER

Next: !p2394, !f2395

BOILER RESET

Next: p439, f2448

VOLTAGE TERMINAL BLOCK FROM EXTERNAL CONTROLS

{SELHWCHON}
ENSURE ALL EXTERNAL CONTROLS ARE CALLING FOR HEAT

Next: p2532, f2525

IS INTEGRAL TIMER FITTED

Next: p2460, f2461

VOLTAGE FROM INTEGRAL TIMER

{SELHWCHON}

Next: !p2464, f2465

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2470, !f2471

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE PLUG X401 FROM THE PCB

Next: p2472, f2473

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2476, f2477

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: p2480, f2481

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: p2486, f2588

RESISTANCE WATER PRESSURE SWITCH

DISCONNECT THE WIRES

Next: !p2484, !f2485

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: !p2490, f2491

PUMP LIMPET TEST

Next: p258, !f2500

RESISTANCE OVERHEAT STAT AND HARNESS

UNPLUG CONNECTOR X401 FROM THE PCB

Next: p2502, !f2503

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2518, !f2516

GAS INLET PRESSURE

{SELHWCHON}
SET T

Next: p1751, !f537

RESISTANCE HARNESS EXTERNAL CONTROLS

REMOVE CONNECTOR X3 FROM THE PCB

Next: p2458, !f2542

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2550, !f2551

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2552, !f2553

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2554, !f2555

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2559, !f2560

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2561, !f2562

INSPECTION CONDENSATE PIPE

Next: p2260, !f704

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2563, !f2564

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2568, !f2569

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2570, !f2571

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2572, !f2573

RESISTANCE HARNESS CONTROL PCB TO PUMP PCB

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p2577, !f2578

RESISTANCE HARNESS PUMP

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB
DISCONNECT THE PLUG FROM THE PUMP

Next: p2579, !f2580

VOLTAGE AC PUMP AT RELAY PCB

UNSCREW THE PUMP REL

Next: !p2581, !f2582

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p259, !f2285

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS

Next: !p2591, !f2592

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2501, !f2284

OBSERVATION IS AIR PRESSURE SWITCH PRESENT

Next: p2597, !f2598

PRESSURE APS SWITCHING WITH KIT

DISCONNECT WIRES FROM APS
ATTACH CROCODILE CLIPS TO EXPOSED SPADES ON THE APS

Next: p2599, !f2600

INSPECTION HEAT EXCHANGER

Next: !p2601, !f2602

INSPECTION CONDENSATE PIPE

Next: p2619, !f2620

RESISTANCE SENSOR FLUE OVERHEAT AND HARNESS

REMOVE THE CONNECTOR X401 FROM THE CONTROL BOX

Next: !p2613, f2614

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS

Next: !p2617, !f2618

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p2621, !f2622

INSPECTION HEAT EXCHANGER

Next: !p2623, !f2624

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT WIRES FROM APS

Next: !p2628, !f2629

DOES PUMP RUN ON CH DEMAND

Next: p443, f2556

PUMP LIMPET TEST

Next: p447, !f448

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p449, !f529

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2346, !f528

RESISTANCE WATER PRESSURE SWITCH AND HARNESS

REMOVE THE PLUG X400 FROM THE PCB

Next: !p611, f612

DOES PUMP RUN ON CH DEMAND

Next: p643, f2565

PUMP LIMPET TEST

Next: p649, !f650

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEAD FROM THE FLOW SENSOR

Next: p651, !f652

RESISTANCE SENSOR TEMP RETURN

REMOVE THE LEAD FROM THE RETURN SENSOR

Next: p2010, !f654

CH TEST LOCKOUT

{SELHWCHON}
BOILE

Next: !p658, f1744

RESISTANCE FAN HARNESS

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN
REMOVE CONNECTOR X401 FROM THE PCB

Next: p797, !f795

VOLTAGE AC TO FAN

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1551, !f794

VOLTAGE FAN SUPPLY

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p798, !f799

VOLTAGE DC FROM FAN

{SELHWCHON}

Next: p1524, !f804

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X1 FROM THE PUMP PCB

Next: p811, f812

RESISTANCE FAN AND HARNESS DC

DISCONNECT CONNECTOR X401 FROM THE PCB

Next: p815, f816

RESISTANCE FAN AND HARNESS AC

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p2340, f820

System Information

  • Total Tests: 601
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control