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:

JOHNSON & STARLEY QUANTEC HR28C

WARNING - IMPORTA

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

JOHNSON & STARLEY QUANTEC HR28C

Next: &3, !f2

OBSERVATION DISPLAY OPERATES

Next: &4, f61

OBSERVATION BOILER STANDBY

REMOVE BOILER CASE IF YOU HAVE NOT ALREADY DONE SO

Next: &131, ?5, ?7, ?88

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &114, !f12

E01 - IGNITION LOCKOUT - DUMMY? GO TO IGNITION

Next: &nff, !f302

E02 - FALSE FLAME LOCKOUT

Next: &nff, f38

E03 - OVERHEAT LOCKOUT

Next: &nff, f39

E05 - FAN FAULT

Next: &nff, f40

E08 - FLAME CIRCUIT FAILURE

Next: &nff, f41

E09 - GAS VALVE FEED BACK ERROR

Next: &nff, f42

E12 - EEPROM LOCKOUT

Next: &nff, f43

E15 - FLOW/RETURN SENSOR CALIBRATION CHECK

Next: &nff, f44

E16 | E17 | E18 - SENSOR STUCK LOCKOUT

Next: &nff, f45

E21 - ADC LOCKOUT

Next: &nff, f46

E33 - RETURN THERMISTOR FAULT

Next: &nff, f47

E35 - FLOW THERMISTOR FAULT

Next: &nff, f48

F07 - EXHAUST SENSOR FAULT

Next: &nff, f49

F34 - LOW POWER SUPPLY FROM MAINS

Next: &nff, f50

F37 - LOW WATER PRESSURE

Next: &nff, f407

F39 - OUTDOOR SENSOR ERROR

Next: &nff, f52

F40 - WATER PRESSURE TOO HIGH

Next: &nff, f53

F47 - WATER PRESSURE SENSOR

Next: &nff, f54

F52 - DHW SENSOR LOCKOUT

Next: &nff, f159

F53 - FLUE TEMPERATURE SENSOR LOCKOUT

Next: &nff, f56

F81 - DRIFT TEST WAITING

Next: &nff, f57

F82 - SPRAYAWAY CONDENSATE LEVEL ALARM

Next: &nff, !f58

FUSE FURTHER INVESTIGATION (DUMMY)

Next: &nff, f60

OBSERVATION DHW FLOW RATE

Next: &123, f115

OBSERVATION DHW DEMAND RECOGNISED

Next: &129, f124

OBSERVATION FAN RUNS DHW DEMAND

Next: &140, f130

INFORMATION BOILER SETUP

BEFORE CONTINUING FA

Next: &11, !f132

OPERATION DHW

Next: &206, ?285, ?289, ?291, ?773, ?815

OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: &205, ?141, ?143, ?145, ?147

OBSERVATION CH DEMAND RECOGNISED

Next: &139, f762

OPERATION CH

Next: &208, ?483, ?485, ?528

OBSERVATION PUMP OVERRUN

Next: &nff, !f301

INFORMATION BOILER DIAGNOSTICS

Next: &nff, !f656

F13 - REMOTE RESET LOCKOUT

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f710

F50 - HE DHW OUTLET SENSOR

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f712

INFORMATION ERP PUMP

Next: &nff, !f978

OBSERVATION BURNER IGNITES - IGNITES BUT DOES NOT ESTABLISH

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITES - IGNITES BUT DOES NOT ESTABLISH

TRAP - CONDENSATE

Next: End

OBSERVATION PUMP RUNS DHW DEMAND - NO VOLTAGE TO SWITCH

PCB

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND

HEATING CONTROLS (FIRING NO DEMAND)

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND

SENSOR - TEMPERATURE (FLOW)

Next: End

OBSERVATION DHW FLOW RATE

WATER SUPPLY

Next: End

OBSERVATION DHW FLOW RATE - ISOLATION VALVE

PACK - DHW VALVE

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

OBSERVATION DHW FLOW RATE

DHW RESTRICTOR

Next: End

INFORMATION BOILER SETUP

Z REDIRECT

Next: End

OBSERVATION FAN RUNS DHW DEMAND

SENSOR - TEMPERATURE (FLOW)

Next: End

OBSERVATION FAN RUNS DHW DEMAND

SENSOR - TEMPERATURE - DHW

Next: End

OBSERVATION DHW FLOW RATE - FILTER

PACK - DHW VALVE

Next: End

OBSERVATION FAN RUNS DHW DEMAND

SENSOR - TEMPERATURE (RETURN)

Next: End

F52 - OPEN CIRCUIT

HARNESS X5-X7

Next: End

F53 - FAULT PRESENT

SENSOR - FLUE

Next: End

F53

HARNESS X5-X7

Next: End

E35

SENSOR - TEMPERATURE (FLOW)

Next: End

E21

PCB

Next: End

E33

SENSOR - TEMPERATURE (RETURN)

Next: End

OBSERVATION BURNER IGNITES - NO SPARKING

PCB

Next: End

INFORMATION CASE REMOVAL

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

LEAD - SPARK

Next: End

OBSERVATION BURNER IGNITES - SPARKING NO IGNITION

TRAP - CONDENSATE

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

COMPENSATION TUBE

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

HARNESS X4

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION - NO VOLTAGE TO GAS VALVE

PCB

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

FAN - COMBUSTION

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

INJECTOR 4.75MM

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

ELECTRODE - SPARK DETECTION

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

FLUE

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

BURNER

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION

HEAT EXCHANGER

Next: End

OBSERVATION BURNER IGNITION - DOES NOT ESTABLISH

ELECTRODE - SPARK DETECTION

Next: End

FAULT CODES DHW OP 2

Z REDIRECT

Next: End

OPERATION DHW - DHW COOL RADS HEAT

PCB

Next: End

OPERATION DHW - DHW COOL RADS HEAT

HARNESS X10

Next: End

OBSERVATION PUMP OVERRUN

PCB

Next: End

E01

Z REDIRECT

Next: End

F47 - SHORTING TO EARTH

HARNESS X5-X7

Next: End

F47 - NO VOLTAGE TO PRESSURE SENSOR

PCB

Next: End

F47 - OPEN CIRCUIT

HARNESS X5-X7

Next: End

F53 - FAULT ABSENT

THERMAL FUSE

Next: End

F53 - FAULT ABSENT

SENSOR - FLUE

Next: End

F07 - FAULT PRESENT

SENSOR - FLUE

Next: End

F07 - FAULT ABSENTF

SENSOR - FLUE

Next: End

F07 - FAULT ABSENT

THERMAL FUSE

Next: End

F40 - FAULT PRESENT

SYSTEM PRESSURE (TOO HIGH)

Next: End

F34

Next: End

F40 - FAULT PRESENT

SENSOR - PRESSURE

Next: End

F40 - FAULT ABSENT

SYSTEM PRESSURE (TOO HIGH)

Next: End

F40 - FAULT ABSENT

SENSOR - PRESSURE

Next: End

FAULT CODES 2

Z REDIRECT

Next: End

E05 - HALL

HARNESS X4

Next: End

E05 - FAN DOES NOT RUN

HARNESS X4

Next: End

E05 - FAN

HARNESS X11

Next: End

E05 - LOW VOLTAGES TO FAN

PCB

Next: End

E05 - MAINS VOLTAGE TO FAN

PCB

Next: End

F81

SENSOR - TEMPERATURE (FLOW)

Next: End

E02

LEAD - SPARK

Next: End

E02

WIRING

Next: End

F39 - FAULT PRESENT

HARNESS X3

Next: End

F37 - FAULT PRESENT

SYSTEM PRESSURE

Next: End

F37 - FAULT ABSENT

SYSTEM PRESSURE

Next: End

F37 - FAULT ABSENT

SENSOR - PRESSURE

Next: End

OBSERVATION BURNER IGNITES - BAFFLES

TRAP - CONDENSATE

Next: End

OBSERVATION BURNER IGNITES - BAFFLES

COMPENSATION TUBE

Next: End

OBSERVATION BURNER IGNITES - BAFFLES

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

FAN - COMBUSTION

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

FLUE

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

INJECTOR 4.75MM

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

HEAT EXCHANGER

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

BURNER

Next: End

OPERATION DHW - DHW TOO HOT

SENSOR - TEMPERATURE - DHW

Next: End

FUSE INVESTIGATION

PUMP HEAD - STANDARD

Next: End

FUSE INVESTIGATION

MOTOR - ACTUATOR - 3-WAY VALVE

Next: End

E03 - DOES NOT RESET

SENSOR - TEMPERATURE (RETURN)

Next: End

E09

HARNESS X4

Next: End

E08

PCB

Next: End

E12

PCB

Next: End

OPERATION CH

EXPANSION VESSEL

Next: End

OPERATION CH - UP TO TEMP RADS COOL

PCB

Next: End

OPERATION CH - UP TO TEMP RADS COOL

HARNESS X10

Next: End

OPERATION CH - UP TO TEMP RADS COOL

INSERT - 3-WAY VALVE

Next: End

OPERATION CH - UP TO TEMP RADS COOL

Next: End

OPERATION CH - DOES NOT RAMP UP

SENSOR - TEMPERATURE (FLOW)

Next: End

OPERATION CH - DOES NOT RAMP UP

SENSOR - TEMPERATURE (RETURN)

Next: End

OPERATION CH - DOES NOT RAMP UP

Next: End

E15

SENSOR - TEMPERATURE (FLOW)

Next: End

E15

SENSOR - TEMPERATURE (RETURN)

Next: End

E03 - DOES NOT RESET

SENSOR - TEMPERATURE (FLOW)

Next: End

E03 - RESETS

SENSOR - TEMPERATURE (FLOW)

Next: End

F82

PCB

Next: End

E03 - RESETS

SENSOR - TEMPERATURE (RETURN)

Next: End

E03 - RESETS

SENSOR - TEMPERATURE - DHW

Next: End

E03

PACK - FLOW VALVE / RETURN VALVE

Next: End

E03

PCB

Next: End

E03

HARNESS X10

Next: End

E03

INSERT - 3-WAY VALVE

Next: End

OPERATION CH - UP TO TEMP RADS COOL

PACK - FLOW VALVE / RETURN VALVE

Next: End

E03

HEAT EXCHANGER (WATERWAYS)

Next: End

E03 - RESETS

PCB

Next: End

E16

SENSOR - TEMPERATURE (FLOW)

Next: End

E16

SENSOR - TEMPERATURE (RETURN)

Next: End

E15

PACK - FLOW VALVE / RETURN VALVE

Next: End

E16

PACK - FLOW VALVE / RETURN VALVE

Next: End

E03

SYSTEM PRESSURE

Next: End

E33 - WILL NOT RESET

PCB

Next: End

E16

PUMP HEAD - STANDARD

Next: End

E35 - WILL NOT RESET

PCB

Next: End

F81

SENSOR - TEMPERATURE (RETURN)

Next: End

INFORMATION BOILER DIAGNOSTICS

Z REDIRECT

Next: End

F81

NO FAULT F-LOCKOUT

Next: End

FUSE INVESTIGATION

MOTOR AND INSERT - 3 WAY VALVE

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION - NO DROP

FLUE

Next: End

OBSERVATION BURNER IGNITION - IGNITES BUT DOES NOT ESTABLISH

LEAD - SPARK

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE - MAINS

Next: End

OBSERVATION BOILER STANDBY - FIRES NO DEMAND

FROST PROTECTION

Next: End

OPERATION CH - UP TO TEMP RADS COOL

INTERNAL BYPASS

Next: End

F52 - NO FAULT - DAMAGED

HARNESS X5-X7

Next: End

OBSERVATION DISPLAY ILLUMINATES

LEAD - MAINS

Next: End

F52 - SHORTING TO EARTH

HARNESS X5-X7

Next: End

F39 - FAULT ABSENT

HARNESS X3

Next: End

F39 - FAULT ABSENT - DAMAGED

HARNESS X3

Next: End

F50

WIRING

Next: End

F13

PCB

Next: End

OBSERVATION DHW FLOW RATE

SENSOR - FLOW

Next: End

E02

ELECTRODE - SPARK DETECTION

Next: End

E15

SYSTEM PRESSURE

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE - 3 15A

Next: End

E09

PCB

Next: End

E16

SYSTEM PRESSURE

Next: End

F34 - FAULT ABSENT

Next: End

OBSERVATION PUMP RUNS CH DEMAND

HARNESS X3 / CLOCK

Next: End

OBSERVATION PUMP RUNS CH DEMAND OPENTHERM

HARNESS X3 / CLOCK

Next: End

OPERATION DHW - DHW COOL RADS COOL

SENSOR - TEMPERATURE (FLOW)

Next: End

OPERATION DHW - DHW COOL RADS COOL

SENSOR - TEMPERATURE (RETURN)

Next: End

OPERATION DHW - DHW COOL RADS COOL

SENSOR - TEMPERATURE - DHW

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS X5-X7

Next: End

OPERATION DHW - DHW COOL RADS COOL

HEAT EXCHANGER (WATERWAYS)

Next: End

OPERATION DHW - DHW COOL RADS COOL

TRAP - CONDENSATE

Next: End

OPERATION DHW - DHW COOL RADS COOL

INLET PRESSURE

Next: End

OPERATION DHW - DHW COOL RADS COOL

FAN - COMBUSTION

Next: End

OPERATION DHW - DHW COOL RADS COOL

FLUE

Next: End

OPERATION DHW - DHW COOL RADS COOL

INJECTOR 4.75MM

Next: End

OPERATION DHW - DHW COOL RADS COOL

BURNER

Next: End

OPERATION DHW - DHW COOL RADS COOL

HEAT EXCHANGER

Next: End

OPERATION DHW - DHW COOL RADS COOL

EXTERNAL MIXING

Next: End

OPERATION DHW - DHW COOL RADS COOL - GAS RATE OK

SENSOR - TEMPERATURE (FLOW)

Next: End

OPERATION DHW - DHW COOL RADS COOL - GAS RATE OK

SENSOR - TEMPERATURE (RETURN)

Next: End

OPERATION DHW - DHW COOL RADS COOL - GAS RATE OK

SENSOR - TEMPERATURE - DHW

Next: End

OPERATION DHW - DHW RUNS HOT COLD

SENSOR - TEMPERATURE (FLOW)

Next: End

OPERATION DHW - DHW RUNS HOT COLD

SENSOR - TEMPERATURE (RETURN)

Next: End

OPERATION DHW - DHW RUNS HOT COLD

SENSOR - TEMPERATURE - DHW

Next: End

OPERATION DHW - DHW RUNS HOT COLD

HEAT EXCHANGER (WATERWAYS)

Next: End

E03 - PUMP OVERRUN

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES - FAN RUNS

PCB

Next: End

E03

Next: End

F47 - FAULT ABSENT

SENSOR - PRESSURE

Next: End

F52 - SCALED

SENSOR - TEMPERATURE - DHW

Next: End

OBSERVATION DISPLAY ILLUMINATES

HARNESS X4

Next: End

F40

PACK - FILLING LOOP

Next: End

OBSERVATION DHW FLOW RATE

PLATE HEAT EXCHANGER

Next: End

FUSE INVESTIGATION

FAN - COMBUSTION

Next: End

OBSERVATION BOILER STANDBY - PUMP DOES NOT RUN

HARNESS X11

Next: End

OBSERVATION BOILER STANDBY - PUMP DOES NOT RUN

PCB

Next: End

E03

PUMP HEAD - STANDARD

Next: End

OPERATION DHW - DHW COOL RADS COOL

PUMP HEAD - STANDARD

Next: End

OPERATION DHW - DHW RUNS HOT COLD

PUMP HEAD - STANDARD

Next: End

OBSERVATION PUMP RUNS DHW DEMAND

HARNESS X5-X7

Next: End

INFORMATION ERP PUMP

Z REDIRECT

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND

TAP OR WATER LEAK

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND

SENSOR - FLOW

Next: End

OBSERVATION BOILER STANDBY - FIRES AFTER SELF CHECK

SENSOR - TEMPERATURE - DHW

Next: End

OBSERVATION BOILER STANDBY - FIRES NO DEMAND DHW

FROST PROTECTION

Next: End

OBSERVATION PUMP RUNS DHW DEMAND - SHORTING

SENSOR - FLOW

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND - CH

PCB

Next: End

OBSERVATION PUMP RUNS DHW DEMAND - IGNORING DEMAND

PCB

Next: End

OBSERVATION FAN RUNS DHW DEMAND

PCB

Next: End

F52

PCB

Next: End

F53

PCB

Next: End

F53 - FAULT PRESENT

THERMAL FUSE

Next: End

F52 - FAULT PRESENT

SENSOR - TEMPERATURE - DHW

Next: End

E21

Z REDIRECT

Next: End

OBSERVATION BURNER IGNITION - NO SPARKING

ELECTRODE - SPARK DETECTION

Next: End

OBSERVATION BURNER IGNITES - SPARKING NO IGNITION

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION - RESISTANCE

GAS VALVE PX42

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION - MIXTURE OR NOT OPENING FULLY

GAS VALVE PX42

Next: End

OBSERVATION BURNER IGNITION - DOES NOT ESTABLISH

PCB

Next: End

FAULT CODES DHW OP 1

Z REDIRECT

Next: End

OPERATION DHW - DHW COOL RADS HEAT

INSERT - 3-WAY VALVE

Next: End

OPERATION DHW - DHW COOL RADS HEAT

MOTOR - ACTUATOR - 3-WAY VALVE

Next: End

F47 - IGNORING PRESSURE SENSOR

PCB

Next: End

F47 - FAULT PRESENT

SENSOR - PRESSURE

Next: End

F53

NO FAULT F-LOCKOUT

Next: End

F07 - FAULT PRESENT

THERMAL FUSE

Next: End

F53 - FAULT PRESENT

PCB

Next: End

F07 - FAULT ABSENT

HEAT EXCHANGER (FLUEWAYS)

Next: End

F34

PCB

Next: End

F40

PCB

Next: End

FAULT CODES 1

Z REDIRECT

Next: End

E05 - IGNORING HALL SENSOR

PCB

Next: End

E05 - HALL

FAN - COMBUSTION

Next: End

E05 - FAN DOES NOT RUN

FAN - COMBUSTION

Next: End

E02

PCB

Next: End

F39

PCB

Next: End

F39 - FAULT PRESENT

OUTDOOR SENSOR

Next: End

F37

PCB

Next: End

F37

NO FAULT F-LOCKOUT

Next: End

OBSERVATION BURNER IGNITION - BAFFLES

GAS VALVE PX42

Next: End

OPERATION DHW - DHW TOO HOT

PCB

Next: End

FUSE INVESTIGATION - PUMP

HARNESS X11

Next: End

FUSE INVESTIGATION

FUSE INVESTIGATION - NO ADDITIONAL FAULT

Next: End

FUSE INVESTIGATION

HARNESS X10

Next: End

E03 - DOES NOT RESET

PCB

Next: End

E09

GAS VALVE PX42

Next: End

E08

Z REDIRECT

Next: End

E12

Z REDIRECT

Next: End

OPERATION CH

HOSE - EXPANSION VESSEL

Next: End

OPERATION CH - UP TO TEMP RADS COOL

MOTOR - ACTUATOR - 3-WAY VALVE

Next: End

OPERATION CH - DOES NOT RAMP UPOPERATION DHW - DHW COOL RADS COOL - MODULATING

PCB

Next: End

E03

MOTOR - ACTUATOR - 3-WAY VALVE

Next: End

E03

PLATE HEAT EXCHANGER

Next: End

E15

PCB

Next: End

E16

PCB

Next: End

E33

HARNESS X5-X7

Next: End

E33

Z REDIRECT

Next: End

E35

Z REDIRECT

Next: End

E35

HARNESS X5-X7

Next: End

F81

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES

Next: End

OBSERVATION BURNER IGNITION - SPARKING NO IGNITION - NOT OPENING

GAS VALVE PX42

Next: End

F37 - FAULT PRESENT

SENSOR - PRESSURE

Next: End

OBSERVATION DISPLAY ILLUMINATES - MAINS FUSE

Z REDIRECT

Next: End

F37 - FAULT PRESENT

PACK - FLOW VALVE

Next: End

F37 - FAULT PRESENT

SENSOR - PRESSURE (BLOCKAGE)

Next: End

OPERATION CH - UP TO TEMP RADS COOL

Next: End

F52 - FAULT ABSENT

SENSOR - TEMPERATURE - DHW

Next: End

F39

NO FAULT F-LOCKOUT

Next: End

F39 - FAULT ABSENT

OUTDOOR SENSOR

Next: End

OBSERVATION DISPLAY ILLUMINATES - FAN DOES NOT RUN

PCB

Next: End

F50

HE OUTLET SENSOR

Next: End

F50

PCB

Next: End

F13

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES - PCB FUSE

Z REDIRECT

Next: End

E09

Z REDIRECT

Next: End

F34 - FAULT ABSENT

NO FAULT F-LOCKOUT

Next: End

OBSERVATION PUMP RUNS CH DEMAND

Next: End

OBSERVATION PUMP RUNS CH DEMAND

PCB

Next: End

OBSERVATION PUMP RUNS CH DEMAND

OPENTHERM CONTROLS

Next: End

OBSERVATION PUMP RUNS CH DEMAND OPENTHERM

PCB

Next: End

OBSERVATION DISPLAY ILLUMINATES

SENSOR - PRESSURE

Next: End

OPERATION DHW - DHW COOL RADS COOL - MODULATING

PCB

Next: End

OPERATION DHW - DHW COOL RADS COOL

PLATE HEAT EXCHANGER

Next: End

OPERATION DHW - DHW COOL RADS COOL - NOT GOING TO MAX

PCB

Next: End

OPERATION DHW - DHW COOL RADS COOL - GAS RATE OK

PCB

Next: End

OPERATION DHW - DHW RUNS HOT COLD

PCB

Next: End

OPERATION DHW - DHW RUNS HOT COLD

PLATE HEAT EXCHANGER

Next: End

E03

NO FAULT OVERHEAT

Next: End

OBSERVATION DISPLAY ILLUMINATES

FAN - COMBUSTION

Next: End

F52

NO FAULT F-LOCKOUT

Next: End

F40 - FAULT ABSENT

PACK - FLOW VALVE

Next: End

F40 - FAULT ABSENT

SENSOR - PRESSURE (BLOCKAGE)

Next: End

F40

EXPANSION VESSEL

Next: End

F40

HOSE - EXPANSION VESSEL

Next: End

F40

NO FAULT FOUND F40

Next: End

F47 - FAULT ABSENT

PACK - FLOW VALVE

Next: End

F47 - FAULT ABSENT

SENSOR - PRESSURE (BLOCKAGE)

Next: End

F47

NO FAULT F-LOCKOUT

Next: End

OBSERVATION BOILER STANDBY - PUMP DOES NOT RUN

PUMP HEAD - STANDARD

Next: End

FUSE INVESTIGATION - FAN / SPRAYAWAY

HARNESS X11

Next: End

DHW FLOW RATE

HEAT EXCHANGER (SCALED)

Next: End

OBSERVATION PUMP RUNS DHW DEMAND

SENSOR - FLOW

Next: End

OBSERVATION BOILER STANDBY - FIRING WITH NO DEMAND - DHW

PCB

Next: End

BURNER DOES NOT IGNITE AND NO SPARKING OCCURS

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p142

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p235

BURNER IGNITES BUT BAFFLES OR IS NOISY

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p146

BURNER IGNITES BUT DOES NOT ESTABLISH (SPARKING CONTINUES)

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITES AND ESTABLISHES

Next: p991

INLET PRESSURE DROPS BELOW MINIMUM DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p214

INLET PRESSURE DOES NOT DROP DURING SPARKING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p256

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p286

DHW COOL AND RADIATORS BEGIN TO HEAT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p290

BOILER RUNS FOR SHORT PERIOD THEN SHUTS DOWN WITH FAULT CODE SHOWING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p292

BOILER REACHES TEMPERATURE RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p484

SYSTEM PRESSURE RISE IS EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p486

FAULT CODE DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p6

BOILER AND RADIATOR TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p553

BLOCKAGE PRESENT IN PRESSURE GAUGE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p681

BLOCKAGE PRESENT IN PRESSURE SENSOR AND / OR BLOCKAGE IN SENSOR HOUSING

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p683

BOILER ATTEMPTS TO FIRE OR PUMP/FAN RUN AFTER SELF CHECK

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p8

DHW COOL, RADIATORS REMAIN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p774

GAS RATE LOW

CHARACTERISTIC TEST FROM GAS RATE

Next: p778

BOILER MODULATES OR CUTS OUT BEFORE GAS RATE CAN BE TAKEN

CHARACTERISTIC TEST FROM GAS RATE

Next: p940

DHW RUNS HOT COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p957

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER STANDBY

Next: p89

BLOCKAGE PRESENT IN PRESSURE GAUGE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p881

BLOCKAGE PRESENT IN PRESSURE SENSOR AND / OR BLOCKAGE IN SENSOR HOUSING

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p883

PRESSURE LOW BUT DOES NOT INCREASE RAPIDLY

CHARACTERISTIC TEST FROM PRESSURE EXPANSION VESSEL AND HOSE

Next: !p896

PRESSURE INCREASES RAPIDLY WHEN USING FOOT PUMP

CHARACTERISTIC TEST FROM PRESSURE EXPANSION VESSEL AND HOSE

Next: !p898

BLOCKAGE PRESENT IN PRESSURE GAUGE

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p905

BLOCKAGE PRESENT IN PRESSURE SENSOR AND / OR BLOCKAGE IN SENSOR HOUSING

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

Next: !p907

21/03/2018 11:27:06 1802_1_50_1 21/03/2018 11:32:01

14/03/2018 11:28:16

Next: End

VOLTAGE DHW FLOW SWITCH AT PCB (PERMANENT) - FLOW SWITCH DISC

DISCONNECT CONNECTOR FROM FLOW SWITCH

Next: !p1008, !f1007

OBSERVATION SUPPLY INTO BOILER

Next: p118, !f116

VOLTAGE DHW FLOW SWITCH AT PCB (FROM FLOW SWITCH)

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p128, f972

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p133, !f134

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p165, f694

RESISTANCE HARNESS DHW SENSOR

DISCONNECT SPADES FROM DHW SENSOR
DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p185, !f169

RESISTANCE FLUE SENSOR

DISCONNECT WIRES FROM FLUE THERMISTOR

Next: p174, !f175

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: !p650, !f182

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: !p641, !f193

RESISTANCE HARNESS GAS VALVE

DISCONNECT PLUG FROM THE GAS VALVE

Next: !p259, !f260

VOLTAGE DIVERTER VALVE AT PCB

{GAINPCBACS}

Next: p297, !f298

INSPECTION HARNESS WATER PRESSURE SENSOR

DISCONNECT PLUG FROM WATER PRESSURE SWITCH
DISCONNECT CONNECTOR X7 FROM THE PCB

Next: p862, !f308

VOLTAGE PRESSURE SENSOR (PERMANENT) AT PCB

Next: p312, !f313

RESISTANCE FLUE SENSOR

DISCONNECT WIRES FROM FLUE THERMISTOR

Next: p317, !f322

RESISTANCE FLUE SENSOR

DISCONNECT WIRES FROM FLUE THERMISTOR

Next: !p325, !f326

RESISTANCE FLUE SENSOR

DISCONNECT WIRES FROM FLUE THERMISTOR

Next: p330, !f331

VOLTAGE FAN AT PCB (HV)

{GAINPCBACS}

Next: p369, !f378

INSPECTION PRESSURE SYSTEM (TOO HIGH)

Next: p349, !f348

RESISTANCE HARNESS FAN (LV)

DISCONNECT LOW VOLTAGE PLUG FROM THE FAN

Next: !p367, !f366

RESISTANCE SPARK ELECTRODE LEAD

DISCONNECT SPARK ELECTRODE LEAD FROM THE SPARK ELECTRODE AND PCB

Next: p739, !f396

OBSERVATION BOILER RESET (OVERHEAT)

ENSURE BOILER IS COOL

Next: p598, f500

OBSERVATION DOES FAN RUN BEFORE LOCKOUT

Next: p344, f343

RESISTANCE HARNESS OUTDOOR SENSOR

DISCONNECT X3 FROM THE PCB

Next: !p402, !f403

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p408, f410

OBSERVATION BOILER RESET

Next: !p511, !f512

INSPECTION PRESSURE SYSTEM

Next: p415, !f412

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: p749, f507

OBSERVATION BOILER RESET

Next: !p513, !f514

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p570, !f569

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p628, !f629

OBSERVATION BOILER RESET

Next: !p187, !f189

RESISTANCE RETURN SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p640, f191

RESISTANCE FLOW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p180, f181

RESISTANCE DIVERTER VALVE

DISCONNECT WIRES FROM DIVERTER VALVE
UNCLIP AND REMOVE DIVERTER VALVE

Next: !p498, !f499

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT (F7)

Next: p323, f329

RESISTANCE PUMP

DISCONNECT INLINE CONNECTOR AT PUMP FOR MAINS VOLTAGE

Next: !p491, !f492

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p338, f759

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p502, !f576

RESISTANCE HARNESS GAS VALVE

DISCONNECT PLUG FROM THE GAS VALVE

Next: !p508, !f510

VOLTAGE DIVERTER VALVE AT PCB

{GAINPCBACS}

Next: p519, !f520

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p196, f701

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p178, f347

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p309, f306

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT

Next: p171, f316

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p392, !f391

VOLTAGE DIVERTER VALVE AT PCB

{GAINPCBACS}

Next: p591, !f592

RESISTANCE PUMP AND HARNESS

DISCONNECT CONNECTOR X11 FROM THE PCB

Next: p197, f490

OBSERVATION FAN RUNS (NO DISPLAY)

Next: p76, f62

VOLTAGE MAINS IN AT TERMINALS

{GAINPCBACS}

Next: p63, f64

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p621, !f622

RESISTANCE FUSE (MAINS FUSE)

REMOVE FUSE FROM FUSED SPUR

Next: !p66, f67

FUSE FURTHER INVESTIGATION

Next: !p68, !f69

INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

DRAIN BOILER'S PRIMARY CIRCUIT

Next: !p679, ?680, ?682

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p695, f696

RESISTANCE HARNESS DHW SENSOR

DISCONNECT SPADES FROM DHW SENSOR
DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p697, !f698

RESISTANCE OUTDOOR SENSOR AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE PCB

Next: p702, f706

RESISTANCE HARNESS OUTDOOR SENSOR

DISCONNECT X3 FROM THE PCB

Next: !p707, !f708

OBSERVATION REMOTE RESET LOCKOUT

Next: !p717, !f718

OBSERVATION IS BOILER FITTED WITH HEAT RECOVERY

Next: !p713, f714

INSPECTION BOILER WIRING

Next: !p715, !f716

FUSE FURTHER INVESTIGATION

Next: !p73, !f75

VOLTAGE MAINS IN AT TERMINALS (F34)

{GAINPCBACS}

Next: !p760, !f761

OBSERVATION IS OPENTHERM CONTROL FITTED

GAIN ACCESS TO PCB

Next: p768, f763

OBSERVATION LINK EXTERNAL CONTROLS

DISCONNECT THE WIRES

Next: !p764, f765

RESISTANCE EXTERNAL CONTROLS WITH LINK

LINK STILL IN PLACE AT TERMINAL BLOCKS AS PER PREVIOUS TEST
DISCONNECT CONNECTOR X3 FROM THE PCB

Next: !p766, !f767

RESISTANCE EXTERNAL CONTROLS WITH LINK

LINK STILL IN PLACE AT TERMINAL BLOCKS AS PER PREVIOUS TEST
DISCONNECT CONNECTOR X3 FROM THE PCB

Next: !p771, !f772

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p789, !f790

OBSERVATION DISCONNECT X4

DISCONNECT CONNECTOR X4 FROM THE PCB AND MAKE SAFE

Next: p84, !f85

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p825, !f826

RESISTANCE FAN

DISCONNECT HIGH VOLTAGE PLUG FROM FAN

Next: !p914, !f915

VOLTAGE DHW FLOW SWITCH AT PCB (PERMANENT)

Next: p973, f1005

TEMPERATURE AMBIENT (DHW)

Next: p983, !f990

OBSERVATION DISCONNECT X3 (EXTERNAL CONTROLS)

DISCONNECT CONNECTOR X3 FROM THE PCB AND MAKE SAFE

Next: p106, !f107

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: !p108, !f109

INSPECTION ISOLATION VALVE DHW

Next: p149, !f119

INSPECTION DHW RESTRICTOR

ISOLATE AND DRAIN DH

Next: p910, !f122

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p136, !f156

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p137, !f138

OBSERVATION SPARKING AT PCB

{GAINPCBACS}
DISCONNECT IGNITION LEAD FROM PCB AND MAKE SAFE

Next: p202, !f198

INSPECTION CONDENSATE

Next: p210, !f209

INSPECTION CONDENSATE

Next: p419, !f418

INSPECTION SPARK ELECTRODE

REMOVE ELECTRODE FROM BURNER DOOR

Next: !p277, !f279

INSPECTION DHW FILTER

ISOLATE AND DRAIN DHW SUPPLY TO BOILER

Next: p719, !f153

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p166, f167

RESISTANCE FLUE SENSOR / THERMAL FUSE AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p172, f173

RESISTANCE HARNESS FLUE SENSOR AND THERMAL FUSE

DISCONNECT THE WIRES FROM THE FLUE SENSOR AND THERMAL FUSE
DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p176, !f177

INSPECTION PRESSURE SYSTEM (TOO HIGH)

Next: p336, !f337

OBSERVATION BOILER RESET

Next: !p647, !f649

RESISTANCE OUTDOOR SENSOR AND HARNESS

DISCONNECT CONNECTOR X3 FROM THE PCB

Next: !p400, f401

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR X11 FROM THE PCB

Next: p657, f913

RESISTANCE SPARK ELECTRODE LEAD

DISCONNECT SPARK ELECTRODE LEAD FROM THE SPARK ELECTRODE AND PCB

Next: !p203, !f204

PRESSURE GAS INLET AND DROP

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT (ON GAS ISOLATION VALVE)

Next: p212, ?213, ?215

INSPECTION FAN

Next: p230, !f263

INSPECTION INJECTOR

REMOVE CLIP AT THE T

Next: p268, !f265

INSPECTION COMPENSATION TUBE

Next: p144, !f254

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR X4 FROM THE PCB

Next: p257, f258

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
PULL CONNECTOR X4 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: p669, !f262

INSPECTION SPARK ELECTRODE AND GAP

REMOVE BURNER DOOR FROM APPLIANCE

Next: p267, !f266

INSPECTION BURNER

REMOVE BURNER DOOR ASSEMBLY

Next: p274, !f273

INSPECTION FLUE

Next: p264, !f272

INSPECTION HEAT EXCHANGER

REMOVE BURNER DOOR ASSEMBLY

Next: !p275, !f276

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p482, !f481

OBSERVATION IS DIVERTER IN DHW POSITION

UNCLIP DIVERTER VALVE AND PLACE IN A POSITION WHERE THE DIVERTER SPINDLE CAN BE EASILY OBSERVED

Next: !p295, f296

FAULT CODES

Next: !p293, !f294

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT X10 FROM THE PCB
DISCONNECT SPADES FROM THE DIVERTER VALVE

Next: !p299, !f300

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p311, f310

RESISTANCE HARNESS WATER PRESSURE SENSOR

DISCONNECT PLUG FROM WATER PRESSURE SWITCH

Next: !p314, !f315

RESISTANCE THERMAL FUSE

DISCONNECT LEAD TO THERMAL FUSE

Next: !p318, !f321

RESISTANCE FLUE SENSOR / THERMAL FUSE AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p327, f324

RESISTANCE THERMAL FUSE

DISCONNECT LEAD TO THERMAL FUSE

Next: !p332, !f333

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p345, !f346

VOLTAGE MAINS IN AT TERMINALS (F34)

{GAINPCBACS}

Next: !p342, !f339

VOLTAGE FAN AT PCB (HALL)

{GAINPCBACS}
PULL CONNECTOR X4 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p361, f362

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: p878, !f351

VOLTAGE FAN AT PCB (LV)

{GAINPCBACS}
DISCONNECT CONNECTOR X4 AT THE PCB

Next: p371, !f377

RESISTANCE HARNESS FAN (HV)

DISCONNECT HIGH VOLTAGE PLUG FROM THE FAN
DISCONNECT CONNECTOR X11 FROM THE PCB

Next: p372, !f375

RESISTANCE HARNESS FAN (LV)

DISCONNECT LOW VOLTAGE PLUG FROM THE FAN

Next: !p373, !f374

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p393, !f651

OBSERVATION IS BOILER CURRENTLY SHOWING FAULT (F81)

Next: !p652, !f667

INSPECTION BOILER WIRING

Next: !p398, !f399

INSPECTION PRESSURE SYSTEM

Next: p409, !f411

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p413, f678

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: !p416, !f417

INSPECTION COMPENSATION TUBE

Next: p421, !f420

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT (ON GAS ISOLATION VALVE)

Next: p423, !f422

INSPECTION FAN

Next: p424, !f425

INSPECTION FLUE

Next: p426, !f427

INSPECTION INJECTOR

REMOVE CLIP AT THE T

Next: p428, !f429

INSPECTION HEAT EXCHANGER

REMOVE BURNER DOOR ASSEMBLY

Next: p430, !f431

INSPECTION BURNER

REMOVE BURNER DOOR ASSEMBLY

Next: !p432, !f433

OBSERVATION IS DIVERTER IN CH POSITION

UNCLIP DIVERTER VALVE AND PLACE IN A POSITION WHERE THE DIVERTER SPINDLE CAN BE EASILY OBSERVED

Next: p523, f518

PRESSURE EXPANSION VESSEL

DRAIN BOILER'S PRIMARY CIRCUIT
ATTACH FOOT PUMP TO SCHRADER VALVE ON EXPANSION VESSEL

Next: !p515, !f516

RESISTANCE DIVERTER VALVE AND HARNESS

DISCONNECT CONNECTOR X10 AT THE PCB

Next: !p497, f488

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: !p503, !f504

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p577, !f578

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT X10 FROM THE PCB
DISCONNECT SPADES FROM THE DIVERTER VALVE

Next: !p521, !f522

INSPECTION DIVERTER SPINDLE

UNCLIP AND REMOVE THE DIVERTER MOTOR
(THIS DOES NOT NEED APPLIANCE TO BE DRAINED DOWN)

Next: p583, !f524

INSPECTION EXTERNAL BYPASS

Next: p691, !f527

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p554, !f555

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p566, !f557

TEMPERATURE DIFFERENTIAL CH

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p567, !f568

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p744, !f575

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p579, !f580

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p581, !f582

INSPECTION ISOLATION VALVES

Next: p917, !f588

INSPECTION ISOLATION VALVES

Next: p525, !f617

OBSERVATION DIVERTER VALVE MOVEMENT

UNCLIP DIVERTER VALVE AND PLACE IN A POSITION WHERE
THE DIVERTER SPINDLE CAN BE EASILY OBSERVED

Next: p595, f590

RESISTANCE HARNESS DIVERTER VALVE

DISCONNECT X10 FROM THE PCB
DISCONNECT SPADES FROM THE DIVERTER VALVE

Next: !p593, !f594

INSPECTION DIVERTER SPINDLE

UNCLIP AND REMOVE THE DIVERTER MOTOR
(THIS DOES NOT NEED APPLIANCE TO BE DRAINED DOWN)

Next: p618, !f596

INSPECTION PRESSURE SYSTEM

Next: p833, !f639

FAULT CODES

Next: !p35, !f36

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: p625, f620

OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p829, !f627

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p752, !f631

VOLTAGE MAINS IN AT PCB

Next: p65, !f70

INSPECTION ISOLATION VALVES

Next: p636, !f635

INSPECTION ISOLATION VALVES

Next: !p633, !f634

PUMP TEST - NON ERP PUMPS ONLY

Next: !p637, !f646

OBSERVATION BOILER RESET

Next: !p642, !f643

RESISTANCE FUSE (PCB)

REMOVE FUSE FROM PCB

Next: !p71, f72

INSPECTION DIVERTER BODY AND MOTOR

UNCLIP AND REMOVE DIVERTER MOTOR
(THIS DOES NOT NEED APPLIANCE TO BE DRAINED DOWN)

Next: p487, !f668

INSPECTION FLUE

Next: !p672, !f671

RESISTANCE SPARK ELECTRODE LEAD

DISCONNECT SPARK ELECTRODE LEAD FROM THE SPARK ELECTRODE AND PCB

Next: p148, !f677

TEMPERATURE AMBIENT

Next: p103, !f690

TEMPERATURE INTERNAL BYPASS

Next: !p692, !f693

INSPECTION HARNESS DHW SENSOR

DISCONNECT SPADE CONNECTORS FROM DHW SENSOR
DISCONNECT X5 FROM THE PCB

Next: p865, !f700

INSPECTION HARNESS OUTDOOR SENSOR

DISCONNECT X3 FROM THE PCB

Next: !p705, !f704

INSPECTION DHW FLOW SWITCH

ISOLATE AND DRAIN DHW SUPPLY TO BOILER
REMOVE DHW FLOW SWITCH

Next: p120, !f723

INSPECTION SPARK ELECTRODE

REMOVE ELECTRODE FROM BURNER DOOR

Next: p397, !f743

INSPECTION PRESSURE SYSTEM

Next: p632, !f748

OBSERVATION BOILER RESET

Next: !p750, !f751

INSPECTION PRESSURE SYSTEM

Next: p630, !f758

OBSERVATION DISCONNECT X7

DISCONNECT CONNECTOR X7 FROM THE PCB AND MAKE SAFE

Next: p77, f81

DISCONNECT OPENTHERM CONTROLS

DISCONNECT WIRES FOR OPENTHERM CONTROLS AND MAKE SAFE

Next: !p769, f770

OBSERVATION DISCONNECT PRESSURE SENSOR

DISCONNECT THE PLUG

Next: !p78, !f79

GAS RATE

Next: p775, ?777, ?779

OBSERVATION EXTERNAL MIXING

Next: p807, !f808

INSPECTION CONDENSATE

Next: p793, !f794

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p781, !f782

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p783, !f784

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p785, !f786

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p787, f788

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT (ON GAS ISOLATION VALVE)

Next: p795, !f796

INSPECTION FAN

Next: p797, !f798

INSPECTION FLUE

Next: p799, !f800

INSPECTION INJECTOR

REMOVE CLIP AT THE T

Next: p801, !f802

OBSERVATION WHICH DEMAND IS SHOWING

Next: p684, f982

INSPECTION BURNER

REMOVE BURNER DOOR ASSEMBLY

Next: p803, !f804

INSPECTION HEAT EXCHANGER

REMOVE BURNER DOOR ASSEMBLY

Next: !p805, !f806

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p809, !f810

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p811, !f812

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p813, !f814

RESISTANCE FLOW SENSOR

DISCONNECT WIRES FROM FLOW THERMISTOR (FRONT THERMISTOR)

Next: p817, !f818

RESISTANCE RETURN SENSOR

DISCONNECT WIRES FROM RETURN THERMISTOR (REAR THERMISTOR)

Next: p819, !f820

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: p821, !f822

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES AS SHOWN

Next: !p823, f824

OBSERVATION PUMP OVERRUN

Next: !p831, !f832

INSPECTION EXTERNAL BYPASS

Next: p505, !f861

OBSERVATION DISCONNECT FAN (LV)

DISCONNECT THE LOW V

Next: !p86, !f87

VOLTAGE PRESSURE SENSOR (PRESSURE) AT PCB

{GAINPCBACS}
PULL CONNECTOR X7 BACK SLIGHTLY TO EXPOSE SOLDERED POINTS ON PCB AS SHOWN

Next: p902, !f864

INSPECTION DHW SENSOR

TURN DHW ISOLATION VALVE OFF

Next: !p866, !f867

INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

DRAIN BOILER'S PRIMARY CIRCUIT

Next: p893, ?880, ?882

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p90, !f93

PRESSURE EXPANSION VESSEL AND HOSE

DRAIN BOILER'S PRIMARY CIRCUIT
ATTACH FOOT PUMP TO SCHRADER VALVE ON EXPANSION VESSEL

Next: p894, ?895, ?897

INSPECTION FILLING LOOP

ENSURE BOTH FILLING

Next: !p899, !f900

RESISTANCE HARNESS PUMP

DISCONNECT INLINE CONNECTOR TO PUMP
DISCONNECT X11 FROM THE PCB

Next: !p91, !f92

INSPECTION PRESSURE SENSOR & GAUGE BLOCKAGES

DRAIN BOILER'S PRIMARY CIRCUIT

Next: !p908, ?904, ?906

INSPECTION PLATE HEAT EXCHANGER

ISOLATE DHW
DRAIN BOILER'S PRIMARY AND HOT WATER CIRCUIT
REMOVE FAN

Next: !p916, !f912

PUMP TEST - NON ERP PUMPS ONLY

Next: p589, !f937

PUMP TEST - NON ERP PUMPS ONLY

Next: p780, !f954

PUMP TEST - NON ERP PUMPS ONLY

Next: p816, !f971

RESISTANCE HARNESS FLOW SWITCH

DISCONNECT CONNECTOR X7 FROM THE PCB
DISCONNECT INLINE CONNECTOR TO FLOW SWITCH

Next: !p974, !f975

OBSERVATION ISOLATE DHW

ISOLATE THE COLD FEED TO APPLIANCE (REAR BLUE TAP ON THE DHW INLET PIPE)

Next: p984, !f985

OBSERVATION DISCONNECT FLOW SWITCH

DISCONNECT PLUG FROM FLOW SWITCH AND MAKE SAFE

Next: p986, !f987

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR X5 FROM THE PCB

Next: !p988, !f989

INSPECTION CONDENSATE

Next: p997, !f1004

PRESSURE GAS INLET

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT (ON GAS ISOLATION VALVE)

Next: p673, !f1003

System Information

  • Total Tests: 561
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control