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:

FLEXICOM SX

GLOBALLY REPLACED

Next: &1, *

DIAGNOSTIC CODES (NULL)

Next: &nff, f1020

STATUS CODES (NULL)

Next: &nff, f1030

NO FAULT FOUND

Next: nff

FLEXICOM SX


CASE REMOVAL

Next: &2474, !f3

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM ONE OF THE LINKS BELOW WHICH TYPE OF XSOL DIAGNOSTIC PROCEDURE YOU REQUIRE:

Next: &595, !f5

OBSERVATION FAN RUNS

Next: &2314, ?275, ?277

OBSERVATION PUMP RUNS

Next: &206, f4280

F5 OVERHEAT

OUTSIDE MODEL

Next: &nff, f1085

F3 FAN FAULT

INTENTIONALLY BLANK, HEADER FOR FAULT CODE

Next: &nff, f1176

F6 FLOW THERMISTOR

Next: &nff, f1190

F10 RETURN THERMISTOR

Next: &nff, f1210

F11 FLOW AND OR RETURN THERMISTOR

Next: &nff, f1226

F13 PCB MEMORY OR SENSING FAULT

Next: &nff, f1247

F15 PCB EBUS ERROR

Next: &nff, f1285

F14 GAS VALVE

Next: &nff, f1264

F43 GENERIC ERROR

Next: &nff, f1320

F22 LOW WATER

Next: &nff, f1288

F77 CONDENSATE PUMP

Next: &nff, f1337

F70 SOFTWARE INCOMPATIBLE

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f1563

FUSE FURTHER INVESTIGATION (DUMMY)

INTENTIONALLY BLANK, HEADER FOR FUSE INVESTIGATION

Next: &nff, f1573

OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: &2743, ?2315, ?2317, ?2319, ?2321

OBSERVATION DISPLAY ILLUMINATES

Next: &2598, f3669

OBSERVATION HEATING SETTING

Next: &2600, !f2599

OBSERVATION BOILER STANDBY

ENSURE NO DEMANDS

Next: &4, ?2601, ?2603, ?2624, ?2681

F9 NO PRESSURE RISE ON PUMP OPERATION

Next: &nff, f3131

OPERATION CH

Next: &3084, ?2793, ?2920, ?4122, ?4181

OPERATION DHW

Next: &3860, ?3085, ?3094

OBSERVATION PUMP OVERRUN

Next: &nff, !f3130

F1 NO IGNITION - DUMMY GO TO BURNER IGNITES PAGE

OUTSIDE MODEL

Next: &nff, !f3173

F4 FLAME GOES OUT DURING DEMAND - DUMMY GO TO BURNER IGNITES PAGE

Next: &nff, !f3175

F25 RESET THEN SEND TO F22 (RESET/PASS)

Next: &nff, f3423

F73 - PRESSURE SENSOR

Next: &nff, f3416

F22 DUMMY INTERFACE FOR F22 FAULT CODE DOES NOT RESET

Next: &nff, !f3544

ER COMMUNICATIONS FAULT

OK TO BE BLANK

Next: &nff, f3697

SE SERVICE DUE INFORMATION

Next: &nff, !f3728

COMBUSTION TEST HIGH AND LOW

Next: &3128, f3877

SE SERVICE DUE DISPLAY COMPONENT

OUTSIDE MODEL

Next: &nff, !f4289

QUICK ACCESS AND DATA INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f4383

LITE DIAGNOSTICS

DIAGNOSIS RELIES ON

Next: &nff, !f4385

HEADER FOR QADAI FLOW THERMISTOR

LEFT BLANK FOR QADAI

Next: &nff, f4387

HEADER FOR QADAI RETURN THERMISTOR

LEFT BLANK FOR QADAI

Next: &nff, f4391

HEADER FOR QADAI FAN VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f4395

HEADER FOR QADAI GAS VALVE VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f4399

HEADER FOR QADAI GAS VALVE RESISTANCE

LEFT BLANK FOR QADAI

Next: &nff, f4403

HEADER FOR QADAI PUMP VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f4407

HEADER FOR QADAI SPARK GENERTAOR VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f4411

HEADER FOR QADAI PUMP RESISTANCE

LEFT BLANK FOR QADAI

Next: &nff, f4415

FAIL DIAG CODES

Z REDIRECT

Next: End

FAIL STATUS CODES

Z REDIRECT

Next: End

F5 - STUCK IN FAULT

INTERFACE - APPLIANCE

Next: End

F5

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F5 - CANT CHANGE DSN

INTERFACE - APPLIANCE

Next: End

F3

INTERFACE - APPLIANCE

Next: End

F6

INTERFACE - APPLIANCE

Next: End

F10

INTERFACE - APPLIANCE

Next: End

F13

INTERFACE - APPLIANCE

Next: End

F13

IGNITION LEAD ASSEMBLY

Next: End

F13

HARNESS - ZIG

Next: End

F13

EARTH LEADS

Next: End

F14

INTERFACE - APPLIANCE

Next: End

F15

INTERFACE - APPLIANCE

Next: End

F43

INTERFACE - APPLIANCE

Next: End

F43

DS NUMBER

Next: End

F43

HARNESS - APPLIANCE INTERFACE

Next: End

F77

INTERFACE - APPLIANCE

Next: End

F43

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F43 - MANU DEFECT

ELECTRODE

Next: End

F43

IGNITION LEAD ASSEMBLY

Next: End

F70 NOT RESETTING

INTERFACE - APPLIANCE

Next: End

F70 DSN NOT ADJUSTING

INTERFACE - APPLIANCE

Next: End

F70 STUCK IN FAULT

PCB - MAIN - BMU

Next: End

FUSE INVESTIGATION

PUMP

Next: End

F11

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F11

INTERFACE - APPLIANCE

Next: End

F10

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F6 - DAMAGED

HARNESS - COMBUSTION (X20)

Next: End

F10 - DAMAGED

HARNESS - COMBUSTION (X20)

Next: End

F11 - DAMAGED

HARNESS - COMBUSTION (X20)

Next: End

F3 - FAN DOES NOT RUN - NO POWER TO FAN

PCB - MAIN - BMU

Next: End

F3 - FAN RUNS THEN STOPS

PCB - MAIN - BMU

Next: End

F3 - FAN RUNS THEN STOPS

HARNESS - COMBUSTION (X20)

Next: End

F3 - FAN RUNS

PCB - MAIN - BMU

Next: End

F3 - FAN RUNS

HARNESS - COMBUSTION (X20)

Next: End

F3 - FAN DOES NOT RUN

HARNESS - COMBUSTION (X20)

Next: End

F3 - FAN DOES NOT RUN - NO DEMAND TO FAN

PCB - MAIN - BMU

Next: End

F43 HALL SENSOR_HALL SENSE CONNECTION_FAN RUNS TWICE

PCB - MAIN - BMU

Next: End

F43 - FAN

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

IGNITION LEAD ASSEMBLY

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE - HALL SENSOR

FAN

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

HARNESS - ZIG

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

ELECTRODE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

SIPHON

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

FLUE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR NOISY

SIPHON

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR IS NOISY

FLUE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - NOISY OR BAFFLES

ELECTRODE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

IGNITION LEAD ASSEMBLY

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION - VOLTAGE TO SPARK GENERATOR

PCB - MAIN - BMU

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

HARNESS - ZIG

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

SIPHON

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

FLUE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION - MANU DEFECT

ELECTRODE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

INLET PRESSURE

Next: End

OBSERVATION FAN RUNS - FAN DOES NOT RUN

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION FAN RUNS

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OBSERVATION FAN RUNS

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

OBSERVATION HEATING AND DHW PREHEAT SETTING

Z REDIRECT

Next: End

OBSERVATION BOILER STANDY FAULT CODES 2

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - FAN RUNS CONTINUALLY

PCB - MAIN - BMU

Next: End

OPERVATION BOILER STANDBY - FAN RUNS CONTINUALLY

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS CONTINUALLY

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS CONTINUALLY

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OPERATION DHW - DHW COOL RADS COLD

INTERFACE - APPLIANCE

Next: End

OPERATION DHW - DHW COOL RADS COLD

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OPERATION DHW - DHW COOL RADS COLD

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

OPERATION DHW - DHW TOO COOL RADIATORS COOL

PUMP

Next: End

OPERATION DHW - DHW TOO COOL RADS COLD

SIPHON

Next: End

CASE REMOVAL

Z REDIRECT

Next: End

OBSERVATION PUMP OVERRUN

PCB - MAIN - BMU

Next: End

F1

Z REDIRECT

Next: End

F4

Z REDIRECT

Next: End

OBSERVATION FAN RUNS - FAN RUNS THEN STOPS

PCB - MAIN - BMU

Next: End

OBSERVATION FAN RUNS - RUNS THEN STOPS

HARNESS - COMBUSTION (X20)

Next: End

F5

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

F5

PUMP

Next: End

F73 - NO VOLTAGE TO PRESSURE SENSOR

PCB - MAIN - BMU

Next: End

F73 - PRESSURE SWITCH

HARNESS (X2)

Next: End

F25

INTERFACE - APPLIANCE

Next: End

F22

PUMP

Next: End

F22

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

F22

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F22 LOW WATER - CANT CHANGE DSN

INTERFACE - APPLIANCE

Next: End

F22 LOW WATER_RESTRICTED OR DAMAGED_

FLUE

Next: End

F9 - PUMP DOES NOT RUN - NO POWER TO PUMP

PCB - MAIN - BMU

Next: End

F22

INTERFACE - APPLIANCE

Next: End

F43 - FLOW THERMISTOR

HARNESS - COMBUSTION (X20)

Next: End

F11 - FLOW THERMISTOR

HARNESS - COMBUSTION (X20)

Next: End

F6 - OPEN CIRCUIT

HARNESS - COMBUSTION (X20)

Next: End

F13

HARNESS - COMBUSTION (X20)

Next: End

F13

HARNESS (X2)

Next: End

F14 - RESISTANCE

VALVE - GAS

Next: End

OBSERVATION DISPLAY ILLUMINATES

MAIN FUSE FUSED SPUR F1

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS - MAINS

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE F2

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS (X2)

Next: End

OBSERVATION DISPLAY ILLUMINATES

FAN

Next: End

OBSERVATION DISPLAY ILLUMINATES

PCB - MAIN - BMU

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS - APPLIANCE INTERFACE

Next: End

ER FAULT

SENSOR (WATER PRESSURE)

Next: End

OBSERVATION FAN RUNS - FAN DOES NOT RUN - NO POWER TO FAN

PCB - MAIN - BMU

Next: End

SE FAULT

SE FAULT ADJUSTMENT

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

VALVE - GAS (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

GAS VALVE THROTTLE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT

VALVE - GAS (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR NOISY

GAS VALVE THROTTLE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

VALVE - GAS (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

INJECTOR (GAS VALVE)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

GAS VALVE THROTTLE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR IS NOISY

BAFFLE - FLUEWAY - TOP

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR NOISY WITH BAFFLES

GAS VALVE THROTTLE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION WITH BAFFLES

GAS VALVE THROTTLE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

BAFFLE - FLUEWAY - TOP

Next: End

FUSE INVESTIGATION

IGNITOR - ZIG

Next: End

OPERATION DHW - NOISY - FAILED COMBUSTION

SIPHON

Next: End

OPERATION DHW - NOISY

VALVE - GAS (AIR INTAKE)

Next: End

OPERATION DHW - NOISYOBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

INJECTOR (GAS VALVE)

Next: End

OPERATION DHW - NOISY

FLUE

Next: End

OPERATION DHW - NOISY

HEAT EXCHANGER

Next: End

OPERATION DHW - NOISY

BURNER

Next: End

COMBUSTION TEST HIGH AND LOW

SIPHON

Next: End

COMBUSTION TEST HIGH AND LOW

FLUE

Next: End

COMBUSTION TEST HIGH AND LOW

VALVE - GAS (AIR INTAKE)

Next: End

COMBUSTION TEST HIGH AND LOW

INJECTOR (GAS VALVE)

Next: End

COMBUSTION TEST HIGH AND LOW

HEAT EXCHANGER

Next: End

COMBUSTION TEST HIGH AND LOW

BURNER

Next: End

F9 - PUMP PULSES

SYSTEM AIR

Next: End

F9 - PUMP PULSES

FILTER (PRIMARY FLOW)

Next: End

F9 - PUMP PULSES

VESSEL - EXPANSION

Next: End

F9 PUMP RUNS F9 - PUMP PULSES

SYSTEM AIR

Next: End

F9 PUMP RUNS

FILTER (PRIMARY FLOW)

Next: End

F9 PUMP RUNS

VESSEL - EXPANSION

Next: End

F9 PUMP RUNS

PUMP

Next: End

F13OBSERVATION DISPLAY ILLUMINATES

HARNESS - APPLIANCE INTERFACE

Next: End

F15

EBUS CONTROLS

Next: End

F22 - NO VOLTAGE TO PRESSURE SENSOR

PCB - MAIN - BMU

Next: End

F22 - PRESSURE SWITCH

HARNESS (X2)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

BURNER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT

BURNER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

BURNER

Next: End

F22

BURNER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

HARNESS - ZIG

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

SIPHON

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

FLUE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

BURNER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

ELECTRODE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

VALVE - GAS (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

INJECTOR (GAS VALVE)

Next: End

NOT ESTABLISHING

IGNITION LEAD ASSEMBLY

Next: End

NOT RECTIFYING

IGNITOR - ZIG

Next: End

OBSERVATION BOILER STANDY

FROST PROTECTION

Next: End

OPERATION CH

VESSEL - EXPANSION

Next: End

OPERATION DHW - NOISY

INTERFACE - APPLIANCE

Next: End

OPERATION DHW - NOISY

PUMP

Next: End

OPERATION DHW - NOISY

SIPHON

Next: End

OPERATION DHW - NOISY

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OPERATION DHW - NOISY

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

OPERATION CH - NOISY

Next: End

OPERATION DHW - BOILER NOISY

FILTER (PRIMARY FLOW)

Next: End

OPERATION DHW - NOISY

FAN

Next: End

OPERATION CH - BOILER UP TO TEMP RADS COLD

TAP

Next: End

RADS DO NOT HEAT

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OPERATION CH - BOILER UP TO TEMP RADS COLD

BYPASS

Next: End

OPERATION CH UP TO TEMP RADS COOL

PUMP

Next: End

OPERATION CH - UP TO TEMP RADS COOL

Next: End

OPERATION DHW - DHW COOL RADS COLD

FLUE

Next: End

OPERATION DHW - DHW COOL RADS COLD

BURNER

Next: End

OPERATION DHW - DHW COOL RADS COLD

FILTER (PRIMARY FLOW)

Next: End

OPERATION DHW - DHW COOL RADS COLD GAS RATE LOW

FLUE

Next: End

OPERATION DHW - DHW COOL RADS COLD GAS RATE LOW

BURNER

Next: End

OBSERVATION BOILER STANDBY - FIRES NO DEMAND

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

OBSERVATION BOILER STANDBY - FIRES NO DEMAND

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

F5

FILTER (PRIMARY FLOW)

Next: End

F5 - NOT SHUTTING OFF

PCB - MAIN - BMU

Next: End

F5 - NO OVERRUN

PCB - MAIN - BMU

Next: End

F22

FILTER (PRIMARY FLOW)

Next: End

ER FAULT

FAN

Next: End

ER FAULT

PCB - MAIN - BMU

Next: End

ER FAULT

HARNESS - APPLIANCE INTERFACE

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND

HARNESS - MAINS

Next: End

OPERATION CH - UP TO TEMP RADS COOL

FILTER (PRIMARY FLOW)

Next: End

SE SERVICE DUE

INTERFACE - APPLIANCE

Next: End

POOR OUTPUT

INLET PRESSURE

Next: End

F13

IGNITOR - ZIG

Next: End

F13

ELECTRODE

Next: End

F5

BYPASS

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE - NO POWER TO GAS VALVE

PCB - MAIN - BMU

Next: End

F22 FAULT CODE

INLET PRESSURE

Next: End

F22 LOW WATER_RESTRICTED OR DAMAGED_ GAS RATE LOW

FLUE

Next: End

F22 LOW WATER_RESTRICTED_ GAS RATE LOW

BURNER

Next: End

BLANK FOR QADAI

Z REDIRECT

Next: End

BLANK FOR LITE DIAGNOSTICS

Z REDIRECT

Next: End

QADAI OUT OF RANGE

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

QADAI OUT OF RANGE

THERMISTOR - THERMOMETRIC (RETURN)

Next: End

QADAI NO POWER TO FAN

PCB - MAIN - BMU

Next: End

QADAI NO POWER TO GAS VALVE

PCB - MAIN - BMU

Next: End

QADAI OUT OF RANGE

VALVE - GAS

Next: End

QADAI NO POWER TO PUMP

PCB - MAIN - BMU

Next: End

QADAI NO VOLTAGE TO SPARK GENERATOR

PCB - MAIN - BMU

Next: End

RESISTANCE QADAI

PUMP

Next: End

FOR TYPE DIAG PROCEDURE

Z REDIRECT

Next: End

PASS DIAG CODES

Z REDIRECT

Next: End

PASS STATUS CODES

Z REDIRECT

Next: End

PASS_DSN_LINK TO THERMISTORS_F5

Z REDIRECT

Next: End

F77

CONDENSATE TANK

Next: End

F43 - RETURN THERMISTOR

HARNESS - COMBUSTION (X20)

Next: End

F70 INCORRECT

DS NUMBER ADJUSTMENT

Next: End

F70 RESET

DS NUMBER ADJUSTMENT

Next: End

F11 - RETURN THERMISTOR

HARNESS - COMBUSTION (X20)

Next: End

F10 - OPEN CIRCUIT

HARNESS - COMBUSTION (X20)

Next: End

F6

PCB - MAIN - BMU

Next: End

F10

PCB - MAIN - BMU

Next: End

F15

PCB - MAIN - BMU

Next: End

F3 - FAN RUNS THEN STOPS

FAN

Next: End

F3 - FAN RUNS

FAN

Next: End

F3 - DOES NOT RUN

FAN

Next: End

F43

PCB - MAIN - BMU

Next: End

F43 - FAN RUNS THEN STOPS

FAN

Next: End

F11

PCB - MAIN - BMU

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE - NOT RECOGNISING FAN HALL SENSOR

PCB - MAIN - BMU

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

IGNITOR - ZIG

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

HEAT EXCHANGER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR IS NOISY

HEAT EXCHANGER

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

IGNITOR - ZIG

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

HEAT EXCHANGER

Next: End

OBSERVATION FAN RUNS - FAN DOES NOT RUN - NO VOLTAGE BACK FROM FAN

FAN

Next: End

OBSERVATION BOILER STANDY FAULT CODES 1

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - FAN RUNS CONTINUALLY

FAN

Next: End

OBSERVATION BOILER STANDBY - PUMP RUNS CONTINUALLY

PCB - MAIN - BMU

Next: End

OBSERVATION FAN RUNS - FAN DOES NOT RUN - NO DEMAND TO FAN

PCB - MAIN - BMU

Next: End

OPERATION DHW - DHW COOL RADS COLD

DS NUMBER WRONG NO OTHER FAULT

Next: End

F9 - PUMP DOES NOT RUN

PUMP

Next: End

OBSERVATION FAN RUNS - FAN RUNS THEN STOPS

FAN

Next: End

F73 - STUCK IN FAULT CODE

PCB - MAIN - BMU

Next: End

F73

SENSOR (WATER PRESSURE)

Next: End

F22

DS NUMBER WRONG NO OTHER FAULT

Next: End

F22 - FLUEWAYS BLOCKED

HEAT EXCHANGER

Next: End

F22 - BOILER RESETS

SYSTEM PRESSURE

Next: End

F22 - BOILER DOES NOT RESET

SYSTEM PRESSURE

Next: End

F9 - PUMP PULSES

SYSTEM PRESSURE

Next: End

F25

PCB - MAIN - BMU

Next: End

F43

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

F11

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

F6

THERMISTOR - THERMOMETRIC (FLOW)

Next: End

F14

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION DISPLAY ILLUMINATES - FUSE INVESTIGATION F1

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES

Next: End

OBSERVATION DISPLAY ILLUMINATES - FUSE INVESTIGATION F2

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES

SENSOR (WATER PRESSURE)

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS - COMBUSTION (X20)

Next: End

OBSERVATION DISPLAY ILLUMINATES

INTERFACE - APPLIANCE

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION

VALVE - GAS

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR IS NOISY

VALVE - GAS

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT IGNITE

VALVE - GAS

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - BAFFLES OUT OR IS NOISY WITH BAFFLES

VALVE - GAS

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - EXPLOSIVE IGNITION WITH BAFFLES

VALVE - GAS

Next: End

FUSE INVESTIGATION

FUSE BLOWN

Next: End

FUSE INVESTIGATION

HARNESS - ZIG

Next: End

OPERATION DHW - NOISY

VALVE - GAS (ADJUSTMENT)

Next: End

COMBUSTION TEST HIGH AND LOW

VALVE - GAS (ADJUSTMENT)

Next: End

F9 - PUMP PULSES - PRESSURE INCREASES

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

F9 - PUMP PULSES

PUMP

Next: End

F9 - PUMP PULSES - NO INCREASE

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

F9 - PUMP PULSES - PRESSURE DOES NOT INCREASE

SENSOR (WATER PRESSURE)

Next: End

F9 - PUMP PULSES - NO INCREASE

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F9 - PUMP PULSES - PRESSURE INCREASES

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F9 PUMP RUNS F9 - PUMP PULSES

SYSTEM PRESSURE

Next: End

F9 PUMP RUNS F9 - PUMP PULSES - PRESSURE DOES NOT INCREASE

SENSOR (WATER PRESSURE)

Next: End

F9 PUMP RUNS - NO INCREASE

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F9 PUMP RUNS - NO INCREASE

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

F9 PUMP RUNS - PRESSURE INCREASES

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F9 PUMP RUNS F9 - PRESSURE INCREASES

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

F9 PUMP RUNS - INTERMITTENT

PCB - MAIN - BMU

Next: End

F22 - RESETS

SENSOR (WATER PRESSURE)

Next: End

F22 - RESETS

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F22 - RESETS

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

F22 - STUCK IN FAULT CODE - PRESSURE OK

PCB - MAIN - BMU

Next: End

F22 - STUCK IN FAULT CODE - PRESSURE LOW

PCB - MAIN - BMU

Next: End

F13

PCB - MAIN - BMU

Next: End

F22 - DOES NOT RESET

SENSOR (WATER PRESSURE)

Next: End

F22 - DOES NOT RESET

SENSOR (WATER PRESSURE) - BLOCKAGE

Next: End

F22 - DOES NOT RESET

SUPPORT - PRESSURE SENSOR MANIFOLD

Next: End

OBSERVATION BURNER IGNITES AND ESTABLISHES - DOES NOT ESTABLISH

HEAT EXCHANGER

Next: End

NO RECTIFICATION

PCB - MAIN - BMU

Next: End

OBSERVATION BOILER STANDBY - FIRES WITH NO DEMAND

Next: End

OPERATION CH

PIPE - EV

Next: End

OPERATION DHW

Next: End

OPERATION DHW - UNSATISFACTORY

Next: End

OPERATION DHW - NOISY

DS NUMBER WRONG NO OTHER FAULT

Next: End

OPERATION DHW - BOILER NOISY - DIFFERENTIAL OK

HEAT EXCHANGER

Next: End

OPERATION DHW - DHW TOO COL RADS COLD - FLUEWAYS

HEAT EXCHANGER

Next: End

OPERATION CH - BOILER AND SYSTEM COOL

Next: End

OPERATION DHW - DHW TOO COL RADS COLD - FLUEWAYS GAS RATE LOW

HEAT EXCHANGER

Next: End

OBSERVATION BOILER STANDBY - STUCK ON

PCB - MAIN - BMU

Next: End

ER FAULT

INTERFACE - APPLIANCE

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND

PCB - MAIN - BMU

Next: End

OBSERVATION BOILER RESPONDS TO CH DEMAND

Next: End

OPERATION CH - RADS DO NOT HEAT

Next: End

F9 - INTERMITTENT

SYSTEM PRESSURE (TOO HIGH)

Next: End

F9

SYSTEM PRESSURE (TOO HIGH)

Next: End

F5

NO FAULT

Next: End

F5

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

F22

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

BOILER NOISY

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

BOILER AND SYSTEM COOL

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

BURNER DOES NOT IGNITE - SOLENOID FAULT

VALVE - GAS

Next: End

F22

NO FAULT

Next: End

F22 GAS RATE

PCB - MAIN - BMU

Next: End

F22 LOW WATER_FLUEWAYS BLOCKED_ GAS RATE LOW

HEAT EXCHANGER

Next: End

F14 - MECHANICAL

VALVE - GAS

Next: End

F14 - VOLTAGE TO GAS VALVE

PCB - MAIN - BMU

Next: End

UNABLE TO RESET

PCB - MAIN - BMU

Next: End

FLOW THERMISTOR

RESULT AS EXPECTED

Next: End

RETURN THERMISTOR

RESULT AS EXPECTED

Next: End

FAN VOLTAGE

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR VOLTAGE

RESULT AS EXPECTED

Next: End

PUMP RESISTANCE

RESULT AS EXPECTED

Next: End

FAN RUNS FOR APPROX 10 SECONDS THEN STOPS 4 TIMES

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p2119

FAN DOESN'T RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p2121

BURNER IGNITES BUT DOESNT ESTABLISH

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p2316

BURNER IGNITES AND ESTABLISHES BUT WITH EXPLOSIVE IGNITION

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p2318

IGNITES BUT NOISY OR BAFFLES OUT

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p2320

BURNER DOESNT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p2322

FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p2605

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p2604

PUMP RUNS CONTINUALLY BUT BOILER DOES NOT FIRE

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p2711

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p2682

FAN RUNS FOR APPROX 10 SECONDS THEN STOPS 4 TIMES

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p276

FAN DOESN'T RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS

Next: p279

BOILER AND SYSTEM TOO COOL

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4290

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3803

BOILER DOES NOT REACT TO DHW DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p4126

DHW OPERATION UNSATISFACTORY

CHARACTERISTIC TEST FROM OPERATION DHW

Next: !p4129

PUMP DOES NOT RUN THEN LOCKOUT OCCURS

CHARACTERISTIC TEST FROM OBSERVATION PUMP BEHAVIOUR (F9)

Next: p3133

PUMP RUNS FOR 10 SECOND PERIODS UNTIL LOCKOUT OCCURS

CHARACTERISTIC TEST FROM OBSERVATION PUMP BEHAVIOUR (F9)

Next: p3511

SYSTEM PRESSURE OK BUT DOES NOT INCREASE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: p3967

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p3505

SYSTEM PRESSURE IS LOW AND DOES NOT INCREASE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM (F22)

Next: p3975

SYSTEM PRESSURE LOW BUT INCREASES WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM (F22)

Next: !p3510

SYSTEM PRESSURE OK BUT DOES NOT INCREASE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: p3905

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p3516

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3918

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3900

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3917

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3910

SYSTEM PRESSURE OK BUT DOES NOT INCREASE WHEN WATER ADDED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: p3923

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM

Next: !p3925

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3928

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3930

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3936

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3938

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3970

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3972

PRESSURE SENSOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3987

MANIFOLD BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3990

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4123

BOILER REACHES TEMPERATURE, RADS DO NOT HEAT OR ONLY GET WARM

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4199

SYSTEM PRESSURE EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM (F9)

Next: !p4329

SYSTEM PRESSURE EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SYSTEM (F9)

Next: !p4331

UNABLE TO GAS RATE - BOILER ENTERS FAULT CODE WHEN SERVICE MODE ACTIVATED

Next: !p4357

GAS RATE UNSATISFACTORY

Next: p4359

VOLTAGE NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE GAS VALVE AT PCB

Next: !p4379

UNABLE TO RESET PCB

CHARACTERISTIC TEST FROM VOLTAGE GAS VALVE AT PCB

Next: !p4381

05/05/2023 13:37:23 2303_1_50_1 29/11/2023 12:52:10

09/08/2023 13:36:35

Next: End

DIAGNOSTIC NUMBER CODES

Next: !p1021, !f1022

STATUS CODES

Next: !p1031, !f1032

OBSERVATION BOILER RESET (OVERHEAT)

ENSURE BOILER IS COOL

Next: p1100, !f1087

ADJUSTMENT DS NUMBER F5

Next: !p1114, !f1115

OBSERVATION BOILER RESET (FAN FAULT)

Next: p2115, !f1178

OBSERVATION BOILER RESET (THERMISTOR FAULT)

Next: p2029, !f1192

OBSERVATION BOILER RESET (THERMISTOR FAULT)

Next: p2034, !f1212

OBSERVATION BOILER RESET (THERMISTOR FAULT)

Next: p2019, !f2028

OBSERVATION BOILER RESET

Next: p1252, !f1253

OBSERVATION BOILER RESET

Next: p3563, !f1266

OBSERVATION BOILER RESET

Next: p2049, !f1287

OBSERVATION BOILER RESET (F22)

Next: p3365, f3364

OBSERVATION BOILER RESET

Next: p1321, !f1322

OBSERVATION BOILER RESET

Next: !p1338, !f1339

RESISTANCE HARNESS FLOW THERMISTOR

DISCONNECT THE SPADE CONNECTORS FROM THE THERMISTOR AND THE X20 CONNECTOR FROM THE PCB

Next: !p3546, !f3547

RESISTANCE RETURN THERMISTOR

DISCONNECT WIRES FROM THE RETURN THERMISTOR

Next: !p1493, !f1494

OBSERVATION BOILER RESET

Next: p1564, !f1565

ADJUSTMENT DS NUMBER (F70)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST.

Next: !p1568, !f1569

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X14 FROM THE PCB

Next: p3798, !f1574

RESISTANCE HARNESS FLOW THERMISTOR

DISCONNECT THE SPADE CONNECTORS FROM THE THERMISTOR AND THE X20 CONNECTOR FROM THE PCB

Next: !p3548, !f3549

RESISTANCE RETURN THERMISTOR

DISCONNECT WIRES FROM THE RETURN THERMISTOR

Next: !p2026, !f2027

RESISTANCE HARNESS FLOW THERMISTOR

DISCONNECT THE SPADE CONNECTORS FROM THE THERMISTOR AND THE X20 CONNECTOR FROM THE PCB

Next: !p3550, !f3551

RESISTANCE RETURN THERMISTOR

DISCONNECT WIRES FROM THE RETURN THERMISTOR

Next: !p2037, !f2038

VOLTAGE FAN AT PCB (PIN 12)

GAIN ACCESS TO THE X20 CONNECTOR ON THE RIGHT HAND SIDE OF THE PCB

Next: p2176, !f2177

RESISTANCE ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2329, !f2330

VOLTAGE FAN AT PCB (PINS 12 AND 13)

ACCESS THE X20 CONNECTOR ON THE RIGHT HAND SIDE OF THE PCB

Next: !p2333, !f2334

INSPECTION FLUE

Next: p2349, !f2350

INSPECTION FLUE

Next: p2373, !f2374

RESISTANCE ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2395, !f2396

INSPECTION FLUE

Next: p2407, !f2408

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2464, !f2465

ADJUSTMENT DS NUMBER (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST.

Next: !p2798, !f2799

OBSERVATION PUMP BEHAVIOUR (F9)

Next: p3920, ?3132, ?3134

INSPECTION PRESSURE SYSTEM (F22)

Next: !p3974, ?3507, ?3509

VOLTAGE PRESSURE SENSOR INTO PCB

Next: !p3417, f3418

VOLTAGE PRESSURE SENSOR FROM PCB

Next: p3419, !f3420

OBSERVATION BOILER RESET (F25)

Next: !p3545, !f3424

ADJUSTMENT DS NUMBER F22

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST.

Next: !p3440, !f3441

INSPECTION FLUE

Next: p3444, !f3445

RESISTANCE GAS VALVE

DISCONNECT LEAD FROM GAS VALVE

Next: !p3574, !f3575

VOLTAGE MAINS INPUT AT PCB

REMOVE LOWER CONTROL BOX FRONT PANEL

Next: p3670, f3671

RESISTANCE FUSE (MAINS)

REMOVE FUSE FROM FUSED SPUR

Next: p3672, f3673

FUSE FURTHER INVESTIGATION

Next: !p3674, !f3675

FUSE FURTHER INVESTIGATION

Next: !p3680, !f3681

OBSERVATION DISCONNECT PRESSURE SWITCH

DISCONNECT THE PLUG FROM THE WATER PRESSURE SWITCH
RECONNECT X2 AT THE PCB

Next: !p3684, !f3685

OBSERVATION DISCONNECT FAN

REFIT CONNECTOR X20

Next: !p3690, !f3691

OBSERVATION DISCONNECT PRESSURE SWITCH (ER FAULT)

DISCONNECT THE PLUG FROM THE WATER PRESSURE SWITCH

Next: p4273, !f3699

INSPECTION HEAT EXCHANGER BAFFLES

REMOVE THE BURNER FR

Next: p3763, !f3762

INSPECTION HEAT EXCHANGER BAFFLES

REMOVE THE BURNER FR

Next: p3770, !f3773

RESISTANCE SPARK GENERATOR

DISCONNECT CONNECTORS ON THE SPARK GENERATOR

Next: !p3801, !f3802

INSPECTION CONDENSATE

Next: p3835, !f3834

INSPECTION CONDENSATE

Next: p3878, !f3879

VOLTAGE PRESSURE SENSOR FROM PCB

Next: p3978, !f3979

INSPECTION FLUE

Next: p4026, !f4027

TEMPERATURE AMBIENT

Next: p4247, !f4080

ADJUSTMENT DS NUMBER (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST.

Next: !p4133, !f4134

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p4348, !f4165

INSPECTION FLUE

Next: p4221, !f4222

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p4349, !f4228

INSPECTION FLUE

Next: p4231, !f4232

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p4346, !f4257

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p4347, !f4271

VOLTAGE EXTERNAL CONTROLS INTO BOILER

{GAINPCBACS}

Next: !p4281, f4282

INSPECTION HARNESS INSTALLER INTERFACE TO PCB

Next: !p4283, !f4284

RESISTANCE HARNESS GAS VALVE

REMOVE THE PLUG FROM THE GAS VALVE
DISCONNECT CONNECTOR X20 FROM THE PCB

Next: !p4351, !f4352

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: !p4388, !f4389

RESISTANCE RETURN THERMISTOR

DISCONNECT WIRES FROM THE RETURN THERMISTOR

Next: !p4392, !f4393

VOLTAGE FAN AT PCB (PIN 8)

{GAINPCBACS}

Next: !p4396, !f4397

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p4400, !f4401

RESISTANCE GAS VALVE

DISCONNECT LEAD FROM GAS VALVE

Next: !p4404, !f4405

VOLTAGE PUMP AT PCB

GAIN ACCESS TO THE TOP RHS OF THE PCB, CONNECTOR X14

Next: !p4408, !f4409

VOLTAGE PCB TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: !p4412, !f4413

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X14 FROM THE PCB

Next: !p4416, !f4417

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p3231, f1113

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1105, !f3345

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4253, !f1110

INSPECTION HARNESS (X20)

GAIN ACCESS TO PCB

Next: p1254, !f3552

INSPECTION HARNESS (X2)

GAIN ACCESS TO PCB

Next: p1256, !f3553

RESISTANCE ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p4332, !f1259

RESISTANCE HARNESS PCB TO SPARK GENERATOR

UNPLUG THE LEAD FROM THE SPARK GENERATOR AND X21 OF THE PCB

Next: p4321, !f1261

RESISTANCE EARTH LEADS

GAIN ACCESS TO THE EARTH LEADS ON THE BOILER

Next: p3962, !f1263

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p4377, ?4378, ?4380

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p1323, !f1334

INTERFACE HARNESS CONTINUITY

REMOVE THE HARNESS FROM THE INTERFACE PCB AND X51 AT THE PCB

Next: p1485, !f1335

INSPECTION SPARK ELECTRODE

Next: p1532, !f1496

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1487, f1488

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2169, f1492

RESISTANCE ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p1486, !f1542

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p1566, f1567

ADJUSTMENT DS NUMBER RESET (F70)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST.

Next: !p1570, !f1571

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2020, f2021

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2046, f2025

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2040, f2031

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2043, f2036

INSPECTION HARNESS (X20)

GAIN ACCESS TO PCB

Next: !p2041, !f2042

INSPECTION HARNESS (X20)

GAIN ACCESS TO PCB

Next: !p2044, !f2045

INSPECTION HARNESS (X20)

GAIN ACCESS TO PCB

Next: !p2216, !f2048

OBSERVATION DISCONNECT X19

DISCONNECT CONNECTOR X19 FROM THE PCB AND MAKE SAFE

Next: !p2050, !f3966

OBSERVATION FAN RUNS (FAN FAULT)

Next: p2152, ?2118, ?2120

VOLTAGE FAN AT PCB (PIN 12)

GAIN ACCESS TO THE X20 CONNECTOR ON THE RIGHT HAND SIDE OF THE PCB

Next: p2138, !f2139

VOLTAGE FAN AT PCB (PIN 8)

{GAINPCBACS}

Next: p2122, !f2123

VOLTAGE FAN AT PCB (PIN 13 - NO FAN)

ACCESS THE X20 CONNE

Next: p2160, !f2165

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2140, !f2141

VOLTAGE FAN AT PCB (PIN 13)

GAIN ACCESS TO THE RIGHT HAND SIDE OF THE PCB CONNECTOR X20

Next: p2153, !f2154

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2155, !f2156

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2161, !f2162

OBSERVATION FAN RUNS (F43)

Next: !p2173, f2175

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2178, !f2179

PRESSURE GAS INLET

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p4019, !f2424

PRESSURE GAS INLET

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p2389, !f2390

PRESSURE GAS INLET

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p2363, !f2364

PRESSURE GAS INLET

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p2323, !f2324

OBSERVATION SPARKING OUTPUT

REMOVE THE HT LEAD F

Next: p2327, f2328

INSPECTION SPARK ELECTRODE

Next: p2337, !f2338

VOLTAGE PCB TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: p2331, f2332

RESISTANCE HARNESS PCB TO SPARK GENERATOR

UNPLUG THE LEAD FROM THE SPARK GENERATOR AND X21 OF THE PCB

Next: !p2335, !f2336

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X20 FROM THE PCB

Next: p3593, f4350

INSPECTION CONDENSATE

Next: p2343, !f2344

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p3751, f2348

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p2351, !f4006

INSPECTION CONDENSATE

Next: p2367, !f2368

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2371, f2372

INSPECTION SPARK ELECTRODE

Next: p3742, !f2382

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p2375, !f4007

OBSERVATION SPARKING OUTPUT

REMOVE THE HT LEAD F

Next: p2393, f2394

INSPECTION CONDENSATE

Next: p2401, !f2402

VOLTAGE PCB TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: p2397, !f2398

RESISTANCE HARNESS PCB TO SPARK GENERATOR

UNPLUG THE LEAD FROM THE SPARK GENERATOR AND X21 OF THE PCB

Next: !p2399, !f2400

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2405, f2406

INSPECTION SPARK ELECTRODE

Next: p3731, !f2416

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p2409, !f4012

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2461, !f2462

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: !p2732, !f2469

OBSERVATION DISCONNECT EXTERNAL CONTROLS

DISCONNECT X17 AND X19 FROM THE PCB AND MAKE SAFE

Next: !p4081, f4078

FAULT CODES

Next: !p2606, !f2607

VOLTAGE FAN AT PCB (PIN 13)

GAIN ACCESS TO THE RIGHT HAND SIDE OF THE PCB CONNECTOR X20

Next: p2683, !f2684

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2685, !f2686

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2712, !f2714

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: !p2715, !f2713

VOLTAGE FAN AT PCB (PIN 12)

GAIN ACCESS TO THE X20 CONNECTOR ON THE RIGHT HAND SIDE OF THE PCB

Next: p322, !f320

VOLTAGE FAN AT PCB (PIN 8)

{GAINPCBACS}

Next: p346, !f372

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p2859, f2797

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2800, !f2801

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4218, !f2805

PUMP LIMPET TEST

Next: p2893, !f2892

INSPECTION CONDENSATE

Next: p2796, !f2917

VOLTAGE PUMP AT PCB

GAIN ACCESS TO THE TOP RHS OF THE PCB, CONNECTOR X14

Next: !p3146, !f3458

RESISTANCE HARNESS FAN

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p323, !f324

PUMP LIMPET TEST

Next: p1104, !f3346

INSPECTION PRESSURE SYSTEM

Next: p3431, ?3502, ?3504

RESISTANCE HARNESS PRESSURE SWITCH

DISCONNECT THE CONNECTOR X2 FROM THE PCB

Next: !p3421, !f3422

PUMP LIMPET TEST

Next: p3432, !f3433

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p3434, !f3435

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p3436, !f3437

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p3438, f3439

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p4268, f3443

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p3446, !f4016

VOLTAGE FAN AT PCB (PIN 13 - NO FAN)

ACCESS THE X20 CONNE

Next: p2460, f2463

INSPECTION PRESSURE SYSTEM (F9)

Next: p3893, ?3513, ?3515, ?4330

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X20 FROM THE PCB

Next: p1265, f3573

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p2339, !f4353

RESISTANCE FUSE (PCB)

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: p3678, f3679

INSPECTION HARNESS INSTALLER INTERFACE TO PCB

Next: !p3676, !f3677

OBSERVATION DISCONNECT X2

DISCONNECT CONNECTOR X2 FROM THE PCB AND MAKE SAFE

Next: p3682, f3683

OBSERVATION DISCONNECT X20

DISCONNECT CONNECTOR X20 FROM THE PCB AND MAKE SAFE

Next: p3688, f3689

VOLTAGE MAIN PCB TO DISPLAY PCB

REMOVE THE INTERFACE HARNESS PLUG FROM X51 OF THE PCB

Next: p3692, !f3693

RESISTANCE HARNESS MAIN PCB TO DISPLAY PCB

REMOVE THE HARNESS FROM THE INTERFACE PCB AND X51 AT THE PCB

Next: !p3694, !f3695

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p3732, !f3733

INSPECTION BOILER SERIAL NUMBER

Next: p3737, f3766

ADJUSTMENT GAS VALVE THROTTLE (BAFFLES)

USING A 2.5MM ALLEN

Next: !p3739, !f3738

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p3743, !f3744

INSPECTION BOILER SERIAL NUMBER

Next: p3748, f3760

ADJUSTMENT GAS VALVE THROTTLE (BAFFLES)

USING A 2.5MM ALLEN

Next: !p3750, !f3749

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p3752, !f3753

INSPECTION INJECTOR

REMOVE THE GAS VALVE

Next: p3757, !f3755

ADJUSTMENT GAS VALVE THROTTLE (ESTABLISH)

USING A 2.5MM ALLEN

Next: !p3759, !f3758

ADJUSTMENT GAS VALVE THROTTLE (BAFFLES)

USING A 2.5MM ALLEN

Next: !p3764, !f3765

ADJUSTMENT GAS VALVE THROTTLE (BAFFLES)

USING A 2.5MM ALLEN

Next: !p3771, !f3772

RESISTANCE SPARK GENERATOR AND HARNESS

DISCONNECT CONNECTOR X21 FROM THE PCB

Next: !p3799, f3800

COMBUSTION TEST HIGH AND LOW

Next: p4130, f3833

INSPECTION FLUE

Next: p3836, !f3874

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p3844, !f3845

INSPECTION INJECTOR

REMOVE THE GAS VALVE

Next: p3850, !f3847

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM
THE TOP OF THE HEAT EXCHANGER

Next: p3854, !f3875

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p3846, !f3876

INSPECTION FLUE

Next: p3880, !f3881

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p3882, !f3883

INSPECTION INJECTOR

REMOVE THE GAS VALVE

Next: p3884, !f3885

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM
THE TOP OF THE HEAT EXCHANGER

Next: p3886, !f3887

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p3888, !f3889

INSPECTION SYSTEM FULLY VENTED

Next: p3895, !f3894

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: p3896, ?3897, ?3899

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p3901, !f3902

PRESSURE EXPANSION VESSEL

REMOVE THE CAP FROM THE EXPANSION VESSEL SCHRADER VALVE
DRAIN THE BOILER CENTRAL HEATING CIRCUIT

Next: !p3903, !f3904

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: !p3916, ?3907, ?3909

INSPECTION PRESSURE SYSTEM (F9)

Next: p3921, ?3922, ?3924, ?4328

INSPECTION SYSTEM FULLY VENTED

Next: p3943, !f3932

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: !p3926, ?3927, ?3929

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: p3933, ?3935, ?3937

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p3939, !f3940

PRESSURE EXPANSION VESSEL

REMOVE THE CAP FROM THE EXPANSION VESSEL SCHRADER VALVE
DRAIN THE BOILER CENTRAL HEATING CIRCUIT

Next: !p3955, !f3942

PUMP LIMPET TEST

Next: p3931, !f3954

RESISTANCE HARNESS MAIN PCB TO DISPLAY PCB

REMOVE THE HARNESS FROM THE INTERFACE PCB AND X51 AT THE PCB

Next: !p3983, !f3964

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: !p3968, ?3969, ?3971

VOLTAGE PRESSURE SENSOR INTO PCB

Next: !p3982, f3977

RESISTANCE HARNESS PRESSURE SWITCH

DISCONNECT THE CONNECTOR X2 FROM THE PCB

Next: p3984, !f3981

INSPECTION PRESSURE SENSOR

DE-PRESSURISE AND DRAIN PRIMARY CIRCUIT

Next: !p3985, ?3986, ?3988

RESISTANCE HARNESS PCB TO SPARK GENERATOR

UNPLUG THE LEAD FROM THE SPARK GENERATOR AND X21 OF THE PCB

Next: p4038, !f4021

INSPECTION CONDENSATE

Next: p4022, !f4023

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p4024, f4025

INSPECTION SPARK ELECTRODE

Next: p4030, !f4031

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p4028, !f4029

INSPECTION AIR INTAKE

REMOVE THE GAS VALVE

Next: p4032, !f4033

INSPECTION INJECTOR

REMOVE THE GAS VALVE

Next: !p4076, !f4035

RESISTANCE ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p4057, !f4056

RESISTANCE SPARK GENERATOR (NOT RECTIFYING)

REMOVE WIRES FROM SPARK GENERATOR

Next: p4020, !f4075

PRESSURE EXPANSION VESSEL

REMOVE THE CAP FROM THE EXPANSION VESSEL SCHRADER VALVE
DRAIN THE BOILER CENTRAL HEATING CIRCUIT

Next: !p4124, !f4125

INSPECTION DS NUMBER

DS IS THE DEVICE SPECIFIC NUMBER AND SHOULD
CORRESPOND WITH THE BOILER MODEL

Next: p4131, f4132

PUMP LIMPET TEST

Next: p4135, !f4136

INSPECTION CONDENSATE

Next: p4137, !f4138

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4139, !f4140

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4151, !f4142

INSPECTION EXTERNAL BYPASS

Next: p4162, !f4161

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: p4167, f4163

FAN MECHANICAL

REMOVE THE GAS VALVE FROM THE SIDE OF THE FAN

Next: !p4168, !f4169

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p4206, !f4201

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4213, !f4203

INSPECTION INTERNAL BYPASS

WATER OFF
FLOW AND RETURN VALVES OFF
ENSURE APPLIANCE IS COMPLETELY DISCHARGED AND DRAINED

Next: p4285, !f4205

PUMP LIMPET TEST

Next: p4200, !f4212

INSPECTION EXTERNAL BYPASS

Next: p4202, !f4217

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p4219, f4220

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: p4225, f4226

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p4223, !f4224

GAS RATE

Next: !p4229, f4230

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p4233, !f4234

RESISTANCE FLOW THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p4248, !f4249

RESISTANCE RETURN THERMISTOR AND HARNESS

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: !p4252, !f4250

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: p4254, f4255

OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p4260, !f4261

OBSERVATION PUMP OVERRUN

Next: p4343, !f4263

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: p4354, f4269

OBSERVATION DISCONNECT FAN (ER FAULT)

REMOVE THE FAN CONNECTOR AND MAKE SAFE

Next: p4274, !f4275

VOLTAGE MAIN PCB TO DISPLAY PCB

REMOVE THE INTERFACE HARNESS PLUG FROM X51 OF THE PCB

Next: p4276, !f4277

RESISTANCE HARNESS MAIN PCB TO DISPLAY PCB

REMOVE THE HARNESS FROM THE INTERFACE PCB AND X51 AT THE PCB

Next: !p4278, !f4279

INSPECTION PRIMARY FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p4286, !f4287

PRESSURE GAS INLET (OUTPUT)

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p2795, !f4320

RESISTANCE SPARK GENERATOR (NOT RECTIFYING)

REMOVE WIRES FROM SPARK GENERATOR

Next: p1260, !f4327

INSPECTION SPARK ELECTRODE

Next: p1258, !f4342

INSPECTION INTERNAL BYPASS

WATER OFF
FLOW AND RETURN VALVES OFF
ENSURE APPLIANCE IS COMPLETELY DISCHARGED AND DRAINED

Next: !p4344, !f4345

GAS RATE (FAULT CODE)

Next: !p4355, ?4356, ?4358

PRESSURE GAS INLET (OUTPUT)

ATTACH U-GAUGE TO THE INLET PRESSURE TEST POINT ON THE GAS VALVE

Next: p4360, !f4361

INSPECTION FLUE

Next: p4362, !f4363

INSPECTION BURNER

REMOVE THE FAN/GAS VALVE ASSEMBLY AND BURNER FROM THE TOP OF THE HEAT EXCHANGER

Next: !p4364, !f4365

System Information

  • Total Tests: 674
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control