XSol Diagnostic System

FLEXICOM 12HX TO 30HX

GLOBALLY REPLACED

Next: &1, *

DIAGNOSTIC CODES (NULL)

Next: &nff, f1020

STATUS CODES (NULL)

Next: &nff, f1030

FAULT CODES (NULL)

Next: &nff, f1341

NO FAULT FOUND

Next: nff

CASE OFF

CASE REMOVAL

Next: &130, !f3

TYPE OF DIAGNOSTIC PROCEDURE

Next: &595, !f5

POWER UP

Next: &4, ?151, ?155

FAN RUNS

NO DEMAND FOR CH OR

Next: &2314, ?273, ?275, ?277

PUMP RUNS

MAKE SURE ALL STATS ARE TURNED UP
BOILER CH TEMPERATURE SET TO MAX

Next: &206, f596

BOILER OPERATION

MAKE SURE ANY STATS ARE CALLING FOR HEAT

Next: &927, ?638, ?640, ?642, ?644

DHW DEMAND

Next: &2838, !f2797

F5 - OVERHEAT

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

BOILER CH TEMPERATURE SET TO MAX

Next: &635, ?2315, ?2317, ?2319, ?2321

ANTICYCLE

Next: &nff, !p2839

ER FAULT

HEADER FOR ER FAULT CODE - OUTSIDE MODEL

Next: &nff, f2854

HEADER FOR QADAI FLOW THERMISTOR

LEFT BLANK FOR QADAI

Next: &nff, f2869

HEADER FOR QADAI RETURN THERMISTOR

LEFT BLANK FOR QADAI

Next: &nff, f2873

HEADER FOR QADAI GAS VALVE VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f2881

HEADER FOR QADAI SPARK GENERATOR VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f2889

QUICK ACCESS AND DATA INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f2893

LITE DIAGNOSTICS

DIAGNOSIS RELIES ON

Next: &nff, !f2895

HEADER FOR QADAI GAS VALVE RESISTANCE

LEFT BLANK FOR QADAI

Next: &nff, f2897

HEADER FOR QADAI PUMP VOLTAGE

LEFT BLANK FOR QADAI

Next: &nff, f2901

FAIL DIAG CODES

DUMMY

Next: End

FAIL STATUS CODES

DUMMY

Next: End

_RESET_F5

INTERFACE - APPLIANCE

Next: End

_OUT OF RANGE_F5

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_F5

THERMISTOR - THERMOMETRIC

Next: End

_NON ADJUSTABLE_DSN_F5

INTERFACE - APPLIANCE

Next: End

_RESET_F2

INTERFACE - APPLIANCE

Next: End

_RESET_F6

INTERFACE - APPLIANCE

Next: End

_F10

INTERFACE - APPLIANCE

Next: End

_RESET_F13

INTERFACE - APPLIANCE

Next: End

_NO CONTINUITY_FLOW_F13

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY_RETURN_F13

HARNESS - COMBUSTION

Next: End

NO CONTINUITY_F13

IGNITION LEAD ASSEMBLY

Next: End

_NO CONTINUITY_F13

HARNESS - ZIG

Next: End

_NO CONTINUITY_F13

EARTH LEADS

Next: End

_RESET_F14

INTERFACE - APPLIANCE

Next: End

_RESTRICTED_F13

VALVE - GAS

Next: End

_RESTRICTED_F14

GAS VALVE THROTTLE

Next: End

_RESET_F15

INTERFACE - APPLIANCE

Next: End

_RESET_F22

INTERFACE - APPLIANCE

Next: End

_RESET_F43

INTERFACE - APPLIANCE

Next: End

_ADJUST_F43

DS NUMBER

Next: End

_OC_F43

HARNESS - APPLIANCE INTERFACE

Next: End

_RESET_F77

INTERFACE - APPLIANCE

Next: End

FAIL _FAULT CODES

DUMMY

Next: End

_BLOCKED_NOT ENOUGH HEAT_BOILER AT TEMP

SUMP

Next: End

_RESTRICTED_NOT ENOUGH HEAT _BOILER AT TEMP

PUMP

Next: End

_RESTRICTED_NOT ENOUGH HEAT_BOILER AT TEMP

HEAT EXCHANGER FLUEWAYS

Next: End

_BLOCKAGE_NOT ENOUGH HEAT_BOILER AT TEMP

Next: End

_OUT OF RANGE_F43

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_F43

THERMISTOR - THERMOMETRIC

Next: End

_MANF DEFECT_F43

ELECTRODE

Next: End

FAULT 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

_OC_NO DISPLAY

MAIN FUSE FUSED SPUR F1

Next: End

_OC_NO DISPLAY

FUSE F2

Next: End

FAULT F22

Next: End

FAULT F22_OC_PUMP RUNS

HARNESS - MAINS - PUMP

Next: End

FAULT F22

HARNESS - MAINS - PUMP

Next: End

_RESTRICTED_F22

PUMP

Next: End

_OUT OF RANGE_F22

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_F22

THERMISTOR - THERMOMETRIC

Next: End

_OPEN CIRC_POWER UP

HARNESS - APPLIANCE INTERFACE

Next: End

FUSE INVESTIGATION

IGNITOR - ZIG

Next: End

NON ADJUSTABLE_SET POINT_BOILER TOO COOL

INTERFACE - APPLIANCE

Next: End

_NON ADJUSTABLE_DSN_BOILER TOO COOL

INTERFACE - APPLIANCE

Next: End

_OUT OF RANGE-BOILER TOO COOL

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_BOILER TOO COOL

THERMISTOR - THERMOMETRIC

Next: End

BOILER TOO COOL_RESTRICTED OR DAMAGED_

FLUE

Next: End

_GAS METER_TOO LOW

GAS SUPPLY

Next: End

F5 FAULT CODE_NO POWER_

Next: End

F5 FAULT CODE_OC_

HARNESS - MAINS - PUMP

Next: End

F5 FAULT CODE_OC_VOLTAGE AT PUMP_

HARNESS - MAINS - PUMP

Next: End

_RESTRICTED_F5

PUMP

Next: End

_SL PERM POWER_F5

Next: End

_RESTRICTED_F5

Next: End

_OUT OF RANGE_F11STUCK IN FAULT

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_F11STUCK IN FAULT

THERMISTOR - THERMOMETRIC

Next: End

F11 NO RESET

INTERFACE - APPLIANCE

Next: End

_OUT OF RANGE_F6

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_F6

THERMISTOR - THERMOMETRIC

Next: End

F6 DAMAGED

HARNESS - COMBUSTION

Next: End

F10 DAMAGED

HARNESS - COMBUSTION

Next: End

F11 DAMAGED

HARNESS - COMBUSTION

Next: End

F15 DAMAGED

HARNESS - COMBUSTION

Next: End

F3 FAULT CODE_NO POWER TO FAN_FAN RUNS

PCB - MAIN - BMU

Next: End

F3 FAULT CODE_HALL SENSE CONNECTION_FAN RUNS TWICE

PCB - MAIN - BMU

Next: End

F3 FAULT CODE_OPEN CIRC__FAN RUNS THEN STOPS

HARNESS - COMBUSTION

Next: End

F3 FAULT CODE_PERMANENTLY ON_FAN RUNS

PCB - MAIN - BMU

Next: End

F3 FAULT CODE_OPEN CIRC_FAN RUNS CONTINUOUSLY

HARNESS - COMBUSTION

Next: End

F3 FAULT CODE_OPEN CIRC_FAN RUNS

HARNESS - COMBUSTION

Next: End

F3 FAULT CODE__RESTRICTED_FAN DOESNT RUN

FAN MECHANICAL

Next: End

F3 FAULT CODE_FROST PROTECTION ON_FAN RUNS

PCB - MAIN - BMU

Next: End

F43 HALL SENSOR_HALL SENSE CONNECTION_FAN RUNS TWICE

PCB - MAIN - BMU

Next: End

F43 HALL SENS_OPEN CIRC__FAN RUNS THEN STOPS

HARNESS - COMBUSTION

Next: End

NO DISPLAY

FAN

Next: End

F22 LOW WATER_RESTRICTED OR DAMAGED_

FLUE

Next: End

F22 LOW WATER - CANT CHANGE DSN

INTERFACE - APPLIANCE

Next: End

BURNER DOES NOT IGNITE

GAS SUPPLY

Next: End

_NO CONTINUITY_BURNER DOESNT IGNITE

IGNITION LEAD ASSEMBLY

Next: End

_HALL SENSOR_NO IGNTION_BURNER IGNITES

FAN

Next: End

_NO CONTINUITY_BURNER DOESNT IGNITE

HARNESS - ZIG

Next: End

_DAMAGED_BURNER DOESNT IGNITE

ELECTRODE

Next: End

_NO POWER TO GAS VALVE_BURNER DOESNT IGNITE

PCB - MAIN - BMU

Next: End

_BLOCKED_BURNER DOESNT IGNITE

SUMP

Next: End

_RESTRICTED OR DAMAGED_BURNER DOESNT IGNITE

FLUE

Next: End

_RESTRICTED_BURNER DOESN'T IGNITE

GAS VALVE THROTTLE

Next: End

_RESTRICTED_BURNER DOESNT IGNITE

VALVE GAS (AIR INTAKE)

Next: End

_RESTRICTED_BURNER DOESNT IGNITE

VALVE GAS (INJECTOR)

Next: End

_GAS METER_BAFFLES OUT OR NOISY

GAS SUPPLY

Next: End

_BLOCKED_BAFFLES OUT OR NOISY

SUMP

Next: End

BAFFLES OUT OR IS NOISY_RESTRICTED OR DAMAGED

FLUE

Next: End

NOISY BAFFLES MANU DEF

ELECTRODE

Next: End

_RESTRICTED_BAFFLES OUT OR NOISY

GAS VALVE THROTTLE

Next: End

_RETRICTED_BAFFLES OUT OR NOISY

VALVE GAS (AIR INTAKE)

Next: End

BAFFLES OUT OR IS NOISY

BAFFLE - FLUEWAY - TOP

Next: End

EXPLOSIVE IGNITION_GAS METER_

GAS SUPPLY

Next: End

_NO CONTINUITY_EXPLOSIVE IGNITION

IGNITION LEAD ASSEMBLY

Next: End

_FAN SPEED_ EXPLOSIVE IGNITION

PCB - MAIN - BMU

Next: End

_NO CONTINUITY_EXPLOSIVE IGNITION

HARNESS - ZIG

Next: End

EXPLOSIVE IGNITION_BLOCKED_BAFFLES OUT OR NOISY

SUMP

Next: End

EXPLOSIVE IGNITION_RESTRICTED OR DAMAGED

FLUE

Next: End

EXPLOSIVE IGNITION_MANF DEFECT_

ELECTRODE

Next: End

EXPLOSIVE IGNITION_RESTRICTED_

GAS VALVE THROTTLE

Next: End

EXPLOSIVE IGNITION_RETRICTED_

VALVE GAS (AIR INTAKE)

Next: End

EXPLOSIVE IGNITION

BAFFLE - FLUEWAY - TOP

Next: End

_GAS METER_BURNER DOESNT ESTABLISH

GAS SUPPLY

Next: End

_OUT OF RANGE_POWER UP

THERMISTOR - THERMOMETRIC

Next: End

_OPEN CIRC_FAN RUNS

HARNESS - COMBUSTION

Next: End

_OUT OF RANGE_FAN RUNS

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_FAN RUNS

THERMISTOR - THERMOMETRIC

Next: End

EXPLOSIVE IGNITION_RESTRICTED_

BURNER

Next: End

BAFFLES OUT OR IS NOISY_RESTRICTED_

BURNER

Next: End

_RESTRICTED_BURNER DOESNT IGNITE

BURNER

Next: End

NOT ENOUGH HEAT BOILER AT TEMP

SYSTEM PRESSURE

Next: End

_PERMANENTLY ON_BOILER TOO HOT

PCB - MAIN - BMU

Next: End

_NOT SET CORRECTLY_TOO HOT

OVERRUN

Next: End

BOILER NOISY

SYSTEM PRESSURE

Next: End

_BLOCKED_F5

SUMP

Next: End

F5

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

_BLOCKAGE_F5

FLUE

Next: End

_RESTRICTED_F5

HEAT EXCHANGER FLUEWAYS

Next: End

_OUT OF RANGE_POWER UP

THERMISTOR - THERMOMETRIC

Next: End

F5

SYSTEM PRESSURE

Next: End

F22

SYSTEM PRESSURE

Next: End

BAFFLES OUT OR NOISY

FLUE

Next: End

NOISY FAILED COMBUSTION

SIPHON

Next: End

OPERATION DHW - NOISY

FLUE

Next: End

OPERATION DHW - NOISY

VALVE GAS (AIR INTAKE)

Next: End

NOISY

VALVE GAS (INJECTOR)

Next: End

NOISY

HEAT EXCHANGER PRIMARY

Next: End

NOISY

BURNER

Next: End

OPERATION DHW - NOISY

PUMP

Next: End

NOISY

SIPHON

Next: End

NOISY

THERMISTOR - THERMOMETRIC

Next: End

NOISY

THERMISTOR - THERMOMETRIC

Next: End

NOISY

Next: End

BOILER NOISY - DIFFERENTIAL WRONG

HEAT EXCHANGER PRIMARY

Next: End

OPERATION DHW - NOISY

FAN

Next: End

BOILER TOO COOL_RESTRICTED_

BURNER

Next: End

F22 LOW WATER_RESTRICTED_

BURNER

Next: End

BOILER TOO COOL_RESTRICTED OR DAMAGED_ GAS RATE LOW

FLUE

Next: End

BOILER TOO COOL_RESTRICTED_ GAS RATE LOW

BURNER

Next: End

F22 FAULT

SYSTEM RESTRICTION OR BLOCKAGE

Next: End

DOES NOT ESTABLISH_NO CONTINUITY_

HARNESS - ZIG

Next: End

DOES NOT ESTABLISH_OC_

IGNITION LEAD ASSEMBLY (EARTH LEAD)

Next: End

NOT RECTIFYING

IGNITION LEAD ASSEMBLY

Next: End

NO RECTIFICATION PATH

IGNITOR - ZIG

Next: End

DOES NOT ESTABLISH_BLOCKED_

SUMP

Next: End

DOES NOT ESTABLISH_RESTRICTED OR DAMAGED_

FLUE

Next: End

DOES NOT ESTABLISH_RESTRICTED_

BURNER

Next: End

_DAMAGED_BURNER LIGHTS BUT DOESNT ESTABLISH

ELECTRODE

Next: End

DOES NOT ESTABLISH_RESTRICTED_

VALVE GAS (AIR INTAKE)

Next: End

DOES NOT ESTABLISH_RESTRICTED_

VALVE GAS (INJECTOR)

Next: End

F13

IGNITOR - ZIG

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS - MAINS

Next: End

_NO POWER_DHW DEMAND

Next: End

_NO CONTINUITY_BURNER DOESNT IGNITE

HARNESS - COMBUSTION

Next: End

F13

ELECTRODE

Next: End

_NO RESPONSE_BOILER OP

PCB - MAIN - BMU

Next: End

F22 FAULT CODE

GAS SUPPLY

Next: End

F22 LOW WATER_RESTRICTED OR DAMAGED_ GAS RATE LOW

FLUE

Next: End

F22 LOW WATER_RESTRICTED_ GAS RATE LOW

BURNER

Next: End

CAUSING ER FAULT CODE

FAN

Next: End

ER FAULT

PCB - MAIN - BMU

Next: End

ER FAULT

HARNESS - APPLIANCE INTERFACE

Next: End

QADAI OUT OF RANGE

THERMISTOR - THERMOMETRIC

Next: End

QADAI OUT OF RANGE

THERMISTOR - THERMOMETRIC

Next: End

QADAI NO POWER TO GAS VALVE

PCB - MAIN - BMU

Next: End

_OC_F14

HARNESS - COMBUSTION

Next: End

_FAN SPEED_EXPLOVSIVE IGNTION QADAI

PCB - MAIN - BMU

Next: End

BLANK FOR QADAI

Z DIRECTION

Next: End

BLANK FOR LITE DIAGNOSTICS

Z DIRECTION

Next: End

RESISTANCE OUT QADAI

VALVE - GAS

Next: End

QADAI NO VOLTAGE TO PUMP

PCB - MAIN - BMU

Next: End

_PERMANENTLY ON_FAN RUNS

PCB - MAIN - BMU

Next: End

CASE REMOVAL

NULL TESTS

Next: End

_HALL SENSE CONNECTION_FAN RUNS TWICE

PCB - MAIN - BMU

Next: End

_OPEN CIRC_FAN RUNS CONTINUOUSLY

HARNESS - COMBUSTION

Next: End

_OPEN CIRC__FAN RUNS THEN STOPS

HARNESS - COMBUSTION

Next: End

_NO POWER TO FAN_FAN RUNS

PCB - MAIN - BMU

Next: End

FOR TYPE DIAG PROCEDURE

NULL TESTS

Next: End

_OC_VOLTAGE AT PUMP_PUMP RUNS

HARNESS - MAINS - PUMP

Next: End

_OC_PUMP RUNS

HARNESS - MAINS - PUMP

Next: End

_NO POWER_PUMP RUNS

Next: End

_OUT OF RANGE_NOT ENOUGH HEAT _BOILER AT TEMP

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_NOT ENOUGH HEAT _BOILER AT TEMP

THERMISTOR - THERMOMETRIC

Next: End

_NON ADJUSTABLE_DSN_NOT ENOUGH HEAT_BOILER AT TEMP

INTERFACE - APPLIANCE

Next: End

NON ADJUSTABLE_SET POINT_NOT ENOUGH HEAT_BOILER AT TEMP

INTERFACE - APPLIANCE

Next: End

NON ADJUSTABLE_SET POINT_BOILER TOO HOT

INTERFACE - APPLIANCE

Next: End

_NON ADJUSTABLE_DSN_BOILER TOO HOT

INTERFACE - APPLIANCE

Next: End

_OUT OF RANGE-BOILER TOO HOT

THERMISTOR - THERMOMETRIC

Next: End

_OUT OF RANGE_BOILER TOO HOT

THERMISTOR - THERMOMETRIC

Next: End

_NON ADJUSTABLE_DSN_NOISY

INTERFACE - APPLIANCE

Next: End

PASS DIAG CODES

DUMMY

Next: End

PASS STATUS CODES

DUMMY

Next: End

PASS_SET POINT_AT TEMP

DUMMY

Next: End

PASS_SET POINT_TOO HOT

DUMMY

Next: End

_NO CONTINUITY FLOW_F5

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_F5

HARNESS - COMBUSTION

Next: End

PASS_DSN_LINK TO THERMISTORS_F5

DUMMY

Next: End

_F13

PCB - MAIN - BMU

Next: End

_F14

PCB - MAIN - BMU

Next: End

_BLOCKAGE_F77

CONDENSATE TANK

Next: End

PASS_FAULT CODES

DUMMY

Next: End

_BLOCKED_NOT ENOUGH HEAT_BOILER AT TEMP

SIPHON

Next: End

_BLOCKED_NOT ENOUGH HEAT_BOILER AT TEMP

HEAT EXCHANGER

Next: End

_NO CONTINUITY FLOW_F43

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_F43

HARNESS - COMBUSTION

Next: End

F70 INCORRECT

DS NUMBER ADJUSTMENT

Next: End

F70 RESET

DS NUMBER ADJUSTMENT

Next: End

FUSE INVESTIGATION

HARNESS - MAINS - PUMP

Next: End

FUSE INVESTIGATION F1

NULL TESTS

Next: End

FUSE INVESTIGATION F2

NULL TESTS

Next: End

FAULT F22

HARNESS - MAINS

Next: End

FAULT F22

Next: End

FAULT F22 NO POWER TO PUMP

PCB - MAIN - BMU

Next: End

FAULT F22_NOT RUNNING

PUMP

Next: End

FAULT F22

PUMP WIRING

Next: End

_NO CONTINUITY FLOW_F22

HARNESS - COMBUSTION

Next: End

F22

NO FAULT

Next: End

_NO CONTINUITY RETURN_F22

HARNESS - COMBUSTION

Next: End

_NO VOLTAGE_POWER UP

INTERFACE - APPLIANCE

Next: End

FUSE INVESTIGATION

FUSE BLOWN

Next: End

FUSE INVESTIGATION

HARNESS - ZIG

Next: End

PASS_SET POINT_TOO COOL

DUMMY

Next: End

_NO CONTINUITY FLOW_BOILER TOO COOL

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_BOILER TOO COOL

HARNESS - COMBUSTION

Next: End

BOILER TOO COOL _FLUEWAYS BLOCKED_

HEAT EXCHANGER PRIMARY

Next: End

RESTRICTED_TOO LOW

GAS SUPPLY PIPEWORK

Next: End

F5 FAULT CODE_NO CONTINUITY_

HARNESS - MAINS

Next: End

F5 FAULT CODE_NO DEMAND_

Next: End

F5 FAULT CODE_PUMP NO POWER_

PCB - MAIN - BMU

Next: End

F5 FAULT CODE_NOT RUNNING_

PUMP

Next: End

F5 FAULT CODE_OC_

PUMP WIRING

Next: End

_SL PERM POWER_F5

PCB - MAIN - BMU

Next: End

_NO CONTINUITY FLOW_F11STUCK IN FAULT

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_F11STUCK IN FAULT

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY FLOW_F6

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_F6

HARNESS - COMBUSTION

Next: End

_F6

PCB - MAIN - BMU

Next: End

F10_

PCB - MAIN - BMU

Next: End

_NO POWER TO INTERFACE_POWER UP

PCB - MAIN - BMU

Next: End

F15

PCB - MAIN - BMU

Next: End

F3 FAULT CODE_HALL SENSOR_FAN RUNS THEN STOPS

FAN

Next: End

F3 FAULT CODE_HALL SENSOR_FAN RUNS

FAN

Next: End

F3 FAULT CODE_NO VOLTAGE BACK FROM FAN_FAN DOESNT RUN

FAN

Next: End

_F43

PCB - MAIN - BMU

Next: End

F43 HALL SENSOR_HALL SENSOR_FAN RUNS THEN STOPS

FAN

Next: End

F5

PCB - MAIN - BMU

Next: End

F5 NO OVERRUN

PCB - MAIN - BMU

Next: End

F11

PCB - MAIN - BMU

Next: End

SHORTED NO DISPLAY

HARNESS - COMBUSTION

Next: End

BOILER OPERATION NOT ENOUGH HEAT

DS NUMBER WRONG NO OTHER FAULT

Next: End

BOILER OPERATION TOO HOT

DS NUMBER WRONG NO OTHER FAULT

Next: End

BOILER OPEATION TOO COOL

DS NUMBER WRONG NO OTHER FAULT

Next: End

BOILER OPERATION NOISY

DS NUMBER WRONG NO OTHER FAULT

Next: End

F22 LOW WATER_FLUEWAYS BLOCKED_

HEAT EXCHANGER PRIMARY

Next: End

F22 FAULT

DS NUMBER WRONG NO OTHER FAULT

Next: End

BURNER DOES NOT IGNITE

GAS SUPPLY PIPEWORK

Next: End

POWER UP FAN RUNS

Next: End

_FAN SPEED_BURNER DOESNT IGNITE

PCB - MAIN - BMU

Next: End

_NO SPARK_BURNER DOESNT IGNITE

IGNITOR - ZIG

Next: End

_BLOCKED_BURNER DOESNT IGNITE

SIPHON

Next: End

_RETRICTED_BURNER DOESNT IGNITE

VALVE - GAS

Next: End

RESTRICTED_BAFFLES OUT OR NOISY

GAS SUPPLY PIPEWORK

Next: End

_BLOCKED_BAFFLES OUT OR NOISY

SIPHON

Next: End

BAFFLES OUT OR IS NOISY

VALVE - GAS

Next: End

EXPLOSIVE IGNITIONRESTRICTED_

GAS SUPPLY PIPEWORK

Next: End

_NO SPARK_EXPLOSIVE IGNITION

IGNITOR - ZIG

Next: End

EXPLOSIVE IGNITION_BLOCKED_

SIPHON

Next: End

_FROST STAT_POWER UP

EXTERNAL FROST STAT CONTROL

Next: End

EXPLOSIVE IGNITION

VALVE - GAS

Next: End

RESTRICTED_BURNER DOESN'T ESTABLISH

GAS SUPPLY PIPEWORK

Next: End

_NO CONTINUITY FLOW_POWER UP

HARNESS - COMBUSTION

Next: End

_NO VOLTAGE BACK FROM FAN_FAN DOESNT RUN

FAN

Next: End

_NO CONTINUITY FLOW_FAN RUNS

HARNESS - COMBUSTION

Next: End

_FROST PROTECTION ON_FAN RUNS

PCB - MAIN - BMU

Next: End

_NO CONTINUITY RETURN_FAN RUNS

HARNESS - COMBUSTION

Next: End

EXPLOSIVE IGNITION_FLUEWAYS BLOCKED_

HEAT EXCHANGER PRIMARY

Next: End

BAFFLES OUT OR IS NOISY_FLUEWAYS BLOCKED_

HEAT EXCHANGER PRIMARY

Next: End

_FLUEWAYS BLOCKED_BURNER DOESNT IGNITE

HEAT EXCHANGER PRIMARY

Next: End

_PERM POWER_BOILER TOO HOT

Next: End

BOILER TOO HOT NO OVERRUN

PCB - MAIN - BMU

Next: End

BOILER TOO HOT

PCB - MAIN - BMU

Next: End

BOILER AND SYSTEM TOO HOT

PCB - MAIN - BMU

Next: End

_BLOCKED_F5

SIPHON

Next: End

F5

NO FAULT

Next: End

_NO CONTINUITY RETURN_POWER UP

HARNESS - COMBUSTION

Next: End

_PERMANENTLY ON_POWER UP

PCB - MAIN - BMU

Next: End

NOISY

VALVE - GAS (ADJUSTMENT)

Next: End

BOILER NOISY - DIFFERENTIAL OK

HEAT EXCHANGER PRIMARY

Next: End

BOILER TOO COOL _FLUEWAYS BLOCKED_ GAS RATE LOW

HEAT EXCHANGER PRIMARY

Next: End

BOILER TOO COOL

Next: End

DOES NOT ESTABLISH_BLOCKED_

SIPHON

Next: End

DOES NOT ESTABLISH_FLUEWAYS BLOCKED_BURNER DOESNT IGNITE

HEAT EXCHANGER PRIMARY

Next: End

NO RECTIFICATION

PCB - MAIN - BMU

Next: End

OBSERVATION DISPLAY ILLUMINATES

Next: End

NO IGNITION - SOLENOID FAULT

VALVE - GAS

Next: End

_STUCK IN ANTICYCLE_NO RESPONSE_BOILER OP

SETTING ADJUSTMENT

Next: End

F22 LOW WATER_FLUEWAYS BLOCKED_ GAS RATE LOW

HEAT EXCHANGER PRIMARY

Next: End

F22 GAS RATE

PCB - MAIN - BMU

Next: End

ER FAULT

INTERFACE - APPLIANCE

Next: End

UNABLE TO RESET

PCB - MAIN - BMU

Next: End

FLOW THERMISTOR

RESULT AS EXPECTED

Next: End

RETURN THERMISTOR

RESULT AS EXPECTED

Next: End

GAS VALVE VOLTAGE

RESULT AS EXPECTED

Next: End

_NO VOLTAGE_F14

PCB - MAIN - BMU

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE AT PCB

RESULT AS EXPECTED

Next: End

_HALL SENSOR_FAN RUNS

FAN

Next: End

_HALL SENSOR_FAN RUNS_FAN RUNS THEN STOPS

FAN

Next: End

_NOT RUNNING_PUMP RUNS

PUMP

Next: End

_OC_PUMP RUNS

PUMP WIRING

Next: End

_PUMP NO POWER_FAN RUNS

PCB - MAIN - BMU

Next: End

_NO CONTINUITY_PUMP RUNS

HARNESS - MAINS

Next: End

_NO DEMAND_PUMP RUNS

Next: End

_NO CONTINUITY FLOW_NOT ENOUGH HEAT _BOILER AT TEMP

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_NOT ENOUGH HEAT _BOILER AT TEMP

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY FLOW_BOILER TOO HOT

HARNESS - COMBUSTION

Next: End

_NO CONTINUITY RETURN_BOILER TOO HOT

HARNESS - COMBUSTION

Next: End

NO DISPLAY

CHARACTERISTIC TEST FROM POWER UP

Next: p157

BOILER PERMANENTLY ON

CHARACTERISTIC TEST FROM POWER UP

Next: p194

FAN RUNS FOR APPROX 10 SECONDS THEN STOPS 4 TIMES

CHARACTERISTIC TEST FROM FAN RUNS

Next: p2119

FAN DOESN'T RUN

CHARACTERISTIC TEST FROM FAN RUNS

Next: p2121

PUMP OVERRUN NOT INDICATED

CHARACTERISTIC TEST FROM PUMP OVERRUN STATUS

Next: !p2209

PUMP OVERRUN INDICATED BUT PUMP NOT RUNNING

CHARACTERISTIC TEST FROM PUMP OVERRUN STATUS

Next: !p2208

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

PUMP OVERRUN NOT INDICATED

CHARACTERISTIC TEST FROM PUMP OVERRUN STATUS

Next: !p2522

PUMP OVERRUN INDICATED BUT PUMP NOT RUNNING

CHARACTERISTIC TEST FROM PUMP OVERRUN STATUS

Next: !p2524

FAN RUNS CONTINUALLY WITH NO DEMAND

CHARACTERISTIC TEST FROM FAN RUNS

Next: p274

FAN RUNS FOR APPROX 10 SECONDS THEN STOPS 4 TIMES

CHARACTERISTIC TEST FROM FAN RUNS

Next: p276

FAN DOESN'T RUN

CHARACTERISTIC TEST FROM FAN RUNS

Next: p279

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

Next: !p2852

GAS RATE UNSATISFACTORY

Next: p2844

UNABLE TO RESET PCB

CHARACTERISTIC TEST FROM GAS VALVE VOLTAGE

Next: !p2865

VOLTAGES NOT AS ABOVE

CHARACTERISTIC TEST FROM GAS VALVE VOLTAGE

Next: p2885

NOT ENOUGH HEAT TO SYSTEM_BOILER AT TEMPERATURE

CHARACTERISTIC TEST FROM BOILER OPERATION

Next: p2485

BOILER AND SYSTEM RUNNING TOO HOT

CHARACTERISTIC TEST FROM BOILER OPERATION

Next: p641

BOILER AND SYSTEM TOO COOL

CHARACTERISTIC TEST FROM BOILER OPERATION

Next: p1939

BOILER NOISY

CHARACTERISTIC TEST FROM BOILER OPERATION

Next: p2544

05/05/2023 10:56:22 2303_1_50_1 29/11/2023 12:52:02

09/08/2023 13:55:20

Next: End

DIAGNOSTIC NUMBER CODES

Next: !p1021, !f1022

STATUS CODES

Next: !p1031, !f1032

RESET (OVERHEAT)

ENSURE BOILER IS COOL
USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p1100, !f1087

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p1107, !f1108

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p1111, !f1112

DS NUMBER ADJUSTMENT F5

Next: !p1114, !f1115

RESET (FAN FAULT)

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2115, !f1178

RESET THERMISTOR FAULT

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2029, !f1192

RESET THERMISTOR FAULT

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2034, !f1212

RESET THERMISTOR FAULT

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2019, !f2028

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p1252, !f1253

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p1265, !f1266

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2049, !f1287

RESET F22 / F25

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p2637, !f1290

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p1321, !f1322

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: !p1338, !f1339

FAULT CODES

Next: !p1342, !f1343

SUMP

DISCONNECT THE CONDE

Next: !p1476, !f1477

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p1489, !f1490

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p1493, !f1494

RESET

USING A SMALL IMPLEMENT, PRESS THE RESET BUTTON BELOW THE DISPLAY

Next: p1564, !f1565

DS NUMBER ADJUSTMENT F70

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p1568, !f1569

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X14 FROM THE PCB

Next: p1934, f1574

RESISTANCE PUMP

GAIN ACCESS TO PUMP WIRING CONNECTIONS
DISCONNECT WIRES FROM THE PUMP

Next: !p1580, !f1581

FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: p2793, f1592

FUSE FURTHER INVESTIGATION

Next: !p1594, !f1595

FUSE FURTHER INVESTIGATION

Next: !p1596, !f1597

PUMP VOLTAGE FROM PCB

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

Next: p1600, f1601

SWITCHED LIVE VOLTAGE AT PCB

APPLY A CH DEMAND, MAKING SURE STATS ARE TURNED UP

Next: p1602, f1603

SWITCHED LIVE AT MAINS CONNECTION

GAIN ACCESS TO THE M

Next: !p1604, f1605

HOT WATER DEMAND

TURN ON THE HOT WATE

Next: !p1606, !f1607

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p1612, !f1613

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p1619, !f1620

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p1623, !f1624

FUSE F2 (APPLIANCE)

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: !p205, f1593

RESISTANCE SPARK GENERATOR

DISCONNECT THE MAINS INTO THE SPARK GENERATOR

Next: !p1937, !f1938

SET POINT ADJUSTMENT (TOO COOL)

Next: !p1942, !f1943

DS NUMBER ADJUSTMENT (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p2237, !f1947

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p1950, !f1951

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p1954, !f1955

FLUE

Next: p1958, !f1959

INLET PRESSURE (RUNNING)

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

Next: p2727, f1969

INLET PRESSURE AT METER

ATTACH GAUGE TO INLET PRESSURE TEST POINT OF METER

Next: !p1970, !f1971

PUMP VOLTAGE FROM PCB

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

Next: p1977, f1978

SWITCHED LIVE VOLTAGE AT PCB

APPLY A CH DEMAND, MAKING SURE STATS ARE TURNED UP

Next: p1979, f1980

SWITCHED LIVE AT MAINS CONNECTION

GAIN ACCESS TO THE M

Next: !p1981, f1982

HOT WATER DEMAND

TURN ON THE HOT WATE

Next: !p1983, !f1984

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p1989, !f1990

SWITCHED LIVE AT MAINS CONNECTION

GAIN ACCESS TO THE M

Next: !p1998, !f1999

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p2022, !f2023

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p2026, !f2027

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p2032, !f2033

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p2037, !f2038

FAN VOLTAGE AT PCB B

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

Next: p2176, !f2177

OBSERVATION DISCONNECT FAN

REFIT CONNECTOR X20

Next: !p2232, !f2233

FROST STAT INPUT TO PCB

MAKE SURE THERE IS NO DEMAND FROM THE EXTERNAL CONTROLS

Next: !p242, f235

FLUE

Next: p2285, !f2286

DS NUMBER ADJUSTMENT F22

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p2312, !f2313

INLET PRESSURE AT METER

ATTACH GAUGE TO INLET PRESSURE TEST POINT OF METER

Next: !p2325, !f2326

SPARK ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2329, !f2330

FAN VOLTAGE AT PCB

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

Next: !p2333, !f2334

SUMP

DISCONNECT THE CONDE

Next: !p2345, !f2346

FLUE

Next: p2482, !f2350

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p246, f243

INLET PRESSURE AT METER

ATTACH GAUGE TO INLET PRESSURE TEST POINT OF METER

Next: !p2365, !f2366

SUMP

DISCONNECT THE CONDE

Next: !p2369, !f2370

FLUE

Next: p2479, !f2374

INLET PRESSURE AT METER

ATTACH GAUGE TO INLET PRESSURE TEST POINT OF METER

Next: !p2391, !f2392

SPARK ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2395, !f2396

SUMP

DISCONNECT THE CONDE

Next: !p2403, !f2404

FLUE

Next: p2476, !f2408

INLET PRESSURE AT METER

ATTACH GAUGE TO INLET PRESSURE TEST POINT OF METER

Next: !p2425, !f2426

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p244, !f245

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2464, f2465

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p2466, !f2467

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p2470, !f2471

SWITCHED LIVE AT MAINS CONNECTION

GAIN ACCESS TO THE M

Next: !p2517, !f2518

SUMP

DISCONNECT THE CONDE

Next: !p2578, !f2579

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p261, !f262

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2696, !f2697

SUMP

DISCONNECT THE CONDE

Next: !p2774, !f2775

FLUE

Next: p2778, !f2779

GAS VALVE HARNESS CONTINUITY

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

Next: !p2827, !f2828

OBSERVATION DISCONNECT FAN (ER FAULT)

REMOVE THE FAN CONNECTOR AND MAKE SAFE

Next: p2855, !f2856

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p2870, !f2871

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p2874, !f2875

GAS VALVE VOLTAGE

Next: !p2882, !f2883

POWER TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: !p2890, !f2891

RESISTANCE GAS VALVE

DISCONNECT LEAD FROM GAS VALVE

Next: !p2898, !f2899

PUMP VOLTAGE FROM PCB

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

Next: !p2902, !f2903

PUMP VOLTAGE FROM PCB

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

Next: p601, f646

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p609, !f610

SWITCHED LIVE VOLTAGE AT PCB

APPLY A CH DEMAND, MAKING SURE STATS ARE TURNED UP

Next: p647, f650

SWITCHED LIVE AT MAINS CONNECTION

GAIN ACCESS TO THE M

Next: !p651, f687

HOT WATER DEMAND

TURN ON THE HOT WATE

Next: !p688, !f689

SET POINT ADJUSTMENT (BOILER AT TEMP)

Next: !p1037, !f739

DS NUMBER ADJUSTMENT (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p2235, !f738

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p702, !f703

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p706, !f707

SET POINT ADJUSTMENT (TOO HOT)

Next: !p1038, !f745

DS NUMBER ADJUSTMENT (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p2236, !f749

FLOW THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE THERMISTOR

Next: !p753, !f754

RETURN THERMISTOR RESISTANCE

REMOVE THE SPADE CONNECTORS FROM THE RETURN THERMISTOR

Next: !p766, !f767

DS NUMBER ADJUSTMENT (INCORRECT OUTPUT)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p2238, !f794

DS NUMBER

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

Next: p2586, f1113

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1105, f1106

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p1974, f1110

FLOW THERMISTOR HARNESS CONTINUITY

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

Next: p1254, !f1255

RETURN THERMISTOR HARNESS CONTINUITY

DISCONNECT THE SPADE

Next: p1256, !f1257

SPARK ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2829, !f1259

SPARK GENERATOR LEAD

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

Next: p2788, !f1261

EARTH LEADS CONTINUITY

GAIN ACCESS TO THE EARTH LEADS ON THE BOILER

Next: !p1262, !f1263

GAS VALVE VOLTAGE

Next: p1279, ?2861, ?2884

P1 PRESSURE

ATTACH A U-GAUGE TO THE P1 TEST POINT OF THE GAS VALVE

Next: p1282, !f1281

THROTTLE

USING A 2.5MM ALLEN

Next: !p1283, !f1284

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

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p1478, f1475

PUMP LIMPET

Next: p1480, !f1479

HEAT EXCHANGER FLUEWAYS

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

Next: p1481, !f1482

FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES NEAR TO THE BOILER

Next: !p1483, !f1484

ELECTRODE

Next: p1532, !f1496

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1487, f1488

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2169, f1492

SPARK ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p1486, !f1542

DS NUMBER

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

Next: p1566, f1567

DS NUMBER RESET (F70)

ACCESS LEVEL 2 DIAGNOSTICS AS IN THE PREVIOUS TEST

Next: !p1570, !f1571

MAINS POWER INPUT TO APPLIANCE

REMOVE LOWER CONTROL BOX FRONT PANEL

Next: p2221, f159

PUMP RUNS

MAKE SURE ALL STATS ARE TURNED UP
BOILER CH TEMPERATURE SET TO MAX

Next: p1614, f1599

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p1610, f1611

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p1608, !f1609

PUMP LIMPET

Next: p1615, !f1616

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1617, f1618

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2293, f1622

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2750, f2284

VOLTAGE TO INTERFACE PCB

REMOVE THE INTERFACE HARNESS PLUG FROM X51 OF THE PCB

Next: p186, f187

INTERFACE HARNESS CONTINUITY

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

Next: !p192, !f193

RESISTANCE SPARK GENERATOR AND HARNESS

DISCONNECT CONNECTOR X21 FROM THE PCB

Next: !p1935, f1936

BOILER THERMOSTAT SET POINT

PRESS THE MODE BUTTON ON THE DISPLAY

Next: p1940, f1941

VOLTAGE PCB SWITCHED LIVE

{GAINPCBACS}
TURN OFF ANY DEMAND FROM EXTERNAL CONTROLS E.G. PROGRAMMER, FROST STAT ETC

Next: !p233, f224

DS NUMBER

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

Next: p1944, f1945

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p1948, f1949

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p1952, f1953

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p1956, f1957

GAS RATE

Next: !p2732, f1967

INSPECTION BURNER

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

Next: !p1960, !f2724

PUMP RUNS

MAKE SURE ALL STATS ARE TURNED UP
BOILER CH TEMPERATURE SET TO MAX

Next: p1993, f1976

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p1987, f1988

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p1985, !f1986

PUMP LIMPET

Next: p1994, !f1995

END OF DEMAND

Next: p1996, f1997

PUMP OVERRUN STATUS

ACCESS THE STATUS CO

Next: p2000, ?2205, ?2207

SYSTEM BYPASS

Next: p2575, !f2003

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2020, f2021

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2046, f2025

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2040, f2031

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2043, f2036

INSPECTION HARNESS

GAIN ACCESS TO PCB

Next: !p2041, !f2042

INSPECTION HARNESS

GAIN ACCESS TO PCB

Next: !p2044, !f2045

INSPECTION HARNESS

GAIN ACCESS TO PCB

Next: !p2216, !f2048

INSPECTION HARNESS

GAIN ACCESS TO PCB

Next: !p2050, !f2051

FAN RUNS (FAULT CODE)

Next: p2152, ?2118, ?2120

FAN VOLTAGE AT PCB B

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

Next: p2138, !f2139

FAN VOLTAGE AT PCB

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

Next: p2122, !f2123

FAN VOLTAGE AT PCB G AND B - NO FAN

ACCESS THE X20 CONNE

Next: p2160, !f2165

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2140, !f2141

FAN VOLTAGE AT PCB

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

Next: p2153, !f2154

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2155, !f2156

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: p2161, !f2162

FAN MECHANICAL

REMOVE THE GAS VALVE FROM THE SIDE OF THE FAN

Next: !p2163, !f2164

FAN RUNS F43

Next: !p2173, f2175

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2178, !f2179

OBSERVATION DISCONNECT X20

DISCONNECT CONNECTOR X20 FROM THE PCB AND MAKE SAFE

Next: p185, f2231

INSPECTION BURNER

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

Next: !p2287, !f2726

DS NUMBER

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

Next: p1760, f2311

INLET PRESSURE

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

Next: p2763, f2424

INLET PRESSURE

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

Next: p2389, f2390

INLET PRESSURE

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

Next: p2363, f2364

INLET PRESSURE

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

Next: p2323, f2324

SPARK TEST

REMOVE THE HT LEAD F

Next: p2327, f2328

ELECTRODE

Next: p2798, !f2338

POWER TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: p2331, f2332

SPARK GENERATOR LEAD

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

Next: !p2335, !f2336

GAS VALVE VOLTAGE

Next: p2339, !f2340

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2343, f2344

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2347, f2348

GAS VALVE BASE SETTINGS

GAS VALVE BASE SETTI

Next: p2357, !f2358

AIR INTAKE

REMOVE THE GAS VALVE

Next: p2359, !f2360

INJECTOR

REMOVE THE GAS VALVE

Next: !p2361, !f2362

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2367, f2368

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2682, f2372

ELECTRODE

Next: p2381, !f2382

GAS VALVE BASE SETTINGS BAFFLES

GAS VALVE BASE SETTI

Next: p2383, !f2384

AIR INTAKE

REMOVE THE GAS VALVE

Next: p2385, !f2386

HEAT EXCHANGER BAFFLE

REMOVE THE BURNER FR

Next: !p2387, !f2388

SPARK TEST

REMOVE THE HT LEAD F

Next: p2393, f2394

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2401, f2402

POWER TO SPARK GENERATOR

ACCESS AND MOVE THE

Next: p2397, !f2398

SPARK GENERATOR LEAD

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

ELECTRODE

Next: p2415, !f2416

GAS VALVE BASE SETTINGS BAFFLES

GAS VALVE BASE SETTI

Next: p2417, !f2418

AIR INTAKE

REMOVE THE GAS VALVE

Next: p2419, !f2420

HEAT EXCHANGER BAFFLE

REMOVE THE BURNER FR

Next: !p2421, !f2422

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: !p263, f260

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p2461, !f2462

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: !p2468, f2469

INSPECTION BURNER

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

Next: !p2477, !f2478

INSPECTION BURNER

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

Next: !p2480, !f2481

INSPECTION BURNER

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

Next: !p2483, !f2484

INSPECTION SYSTEM FILLED AND VENTED

Next: p639, !f2513

END OF DEMAND

Next: p2515, f2516

PUMP OVERRUN STATUS

ACCESS THE STATUS CO

Next: p2519, ?2521, ?2523

OVERRUN SET CORRECTLY

Next: !p2525, !f2526

INSPECTION SYSTEM FILLED AND VENTED

Next: p645, !f2574

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2576, f2577

TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES NEAR TO THE BOILER

Next: p2580, !f2581

FLUE

Next: p2582, !f2583

HEAT EXCHANGER FLUEWAYS

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

Next: !p2584, !f2585

INSPECTION SYSTEM FILLED AND VENTED

Next: p1104, !f2636

INSPECTION SYSTEM FILLED AND VENTED

Next: p1598, !f2681

FLUE

Next: p2371, !f2692

COMBUSTION TEST HIGH AND LOW

Next: p2694, f2695

PUMP LIMPET TEST

Next: p2708, !f2709

FLUE

Next: p2698, !f2699

AIR INTAKE

REMOVE THE GAS VALVE

Next: p2700, !f2701

INJECTOR

REMOVE THE GAS VALVE

Next: p2702, !f2703

HEAT EXCHANGER FLUEWAYS

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

Next: p2704, !f2705

INSPECTION BURNER

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

Next: !p2706, !f2707

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2710, !f2711

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p2712, !f2713

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2714, !f2715

SYSTEM BYPASS

Next: p2716, !f2717

FLOW AND RETURN TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES NEAR TO THE BOILER

Next: p2718, !f2719

FAN MECHANICAL

REMOVE THE GAS VALVE FROM THE SIDE OF THE FAN

Next: !p2720, !f2721

FLUE

Next: p2728, !f2729

INSPECTION BURNER

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

Next: !p2730, !f2731

GAS RATE (FAULT CODE)

Next: !p1621, ?2840, ?2842

FAN VOLTAGE AT PCB

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

Next: p297, !f296

TEMPERATURE DIFFERENTIAL

ATTACH TEMPERATURE PROBES TO THE FLOW AND RETURN PIPES NEAR TO THE BOILER

Next: p2733, !f2762

FAN VOLTAGE AT PCB B

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

Next: p322, !f320

RESISTANCE HARNESS SPARK GENERATOR

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

Next: p2764, !f2765

EARTH CONTINUITY

DISCONNECT THE EARTH LEAD FROM THE ELECTRODE

Next: p2766, !f2767

SPARK ELECTRODE LEAD

DISCONNECT THE SPARK ELECTRODE LEAD

Next: p2768, !f2769

RESISTANCE SPARK GENERATOR (RECTIFICATION)

REMOVE WIRES FROM SPARK GENERATOR

Next: p2770, !f2771

CONDENSATE TRAP AND SUMP CHECK

DISCONNECT THE PUSH

Next: p2772, f2773

PRESSURE FAN ON IGNITION

ATTACH THE PRESSURE GAUGE TO THE OUTLET PRESSURE TEST POINT

Next: p2776, f2777

ELECTRODE

Next: p2782, !f2783

INSPECTION BURNER

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

Next: !p2780, !f2781

AIR INTAKE

REMOVE THE GAS VALVE

Next: p2784, !f2785

INJECTOR

REMOVE THE GAS VALVE

Next: !p2786, !f2787

RESISTANCE SPARK GENERATOR (RECTIFICATION)

REMOVE WIRES FROM SPARK GENERATOR

Next: p1260, !f2792

FAN VOLTAGE AT PCB

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

Next: p346, !f372

RESISTANCE HARNESS INSTALLER INTERFACE TO PCB

GAIN ACCESS TO THE INSTALLER INTERFACE HOUSING
DISCONNECT X10 FROM THE PCB

Next: !p2794, !f2795

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X20 FROM THE PCB

Next: p2337, f2826

ELECTRODE

Next: p1258, !f2837

INLET PRESSURE (RUNNING)

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

Next: p2845, !f2846

FLUE

Next: p2847, !f2848

INSPECTION BURNER

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

Next: !p2849, !f2850

VOLTAGE TO INTERFACE PCB

REMOVE THE INTERFACE HARNESS PLUG FROM X51 OF THE PCB

Next: p2857, !f2858

INTERFACE HARNESS CONTINUITY

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

Next: !p2859, !f2860

GAS VALVE HARNESS CONTINUITY

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

Next: !p2886, !f2887

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p298, !f321

FAN HARNESS CONTINUITY

UNPLUG THE HARNESS FROM THE FAN AND X20 AT THE PCB

Next: !p323, !f324

FAN VOLTAGE AT PCB G AND B - NO FAN

ACCESS THE X20 CONNE

Next: p2460, f2463

VOLTAGE AT PUMP

REMOVE THE COVER FROM THE PUMP

Next: !p602, f608

BOILER THERMOSTAT SET POINT

PRESS THE MODE BUTTON ON THE DISPLAY

Next: p690, f691

BOILER THERMOSTAT SET POINT

PRESS THE MODE BUTTON ON THE DISPLAY

Next: p746, f743

DS NUMBER

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

Next: p2693, f792

PUMP HARNESS CONTINUITY

GAIN ACCESS TO THE ELECTRIC INTERFACE HOUSING ALSO REMOVE THE X14 PLUG FORM THE RHS OF THE PCB

Next: !p648, !f649

DS NUMBER

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

Next: p699, f696

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p700, f701

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p1474, f705

DS NUMBER

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

Next: p750, f747

FLOW THERMISTOR AND HARNESS RESISTANCE

UNPLUG CONNECTOR X20 FROM RIGHT HAND SIDE OF PCB

Next: p764, f752

RETURN THERMISTOR AND HARNESS RESISTANCE

DISCONNECT X20 CONNECTOR FROM RHS OF PCB

Next: p2514, f765

Welcome to the XSol Diagnostic System