XSol Diagnostic System

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:

4715702 HEATLINE S24 COMPACT

WARNING - IMPORTA

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &1054, !f5

BOILER INITIAL SETUP

Next: &6, !f4

POWER UP SELF TEST

ENSURE NO DEMANDS ARE PRESENT

Next: &17, ?22, ?24, ?31, ?48

CH OPERATION

CH TEMPERATURE CONTROL SET TO MAX

Next: &nff, ?656, ?658, ?660, ?662

DHW OPERATION

DHW TEMPERATURE SET TO MAX

Next: &804, ?468, ?470, ?472, ?474

OBSERVATION BURNER IGNITION & ESTABLISH

Next: &12, ?201, ?203, ?205

OBSERVATION PUMP RUNS

Next: &13, f196

OBSERVATION FAN RUNS DHW DEMAND

DHW TEMPERATURE SET TO MAX
ENSURE BOILER IS COOL

Next: &14, ?130, ?132

DHW FLOW RATE

Next: &15, f90

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &19, !f18

OPERATIONAL SEQUENCE

SELECT FROM THE LIST

Next: &16, !f20

DHW MODULATION - BURNER PRESSURE

DHW FLOW RATE APPROX 9 LITRES/MIN
ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: &11, f722

OBSERVATION - BURNER PRESSURE MAXIMUM & MINIMUM

DISCONNECT ONE LEAD

Next: &721, f805

FAULT CODE OVERHEAT THERMOSTAT

NOT USED

Next: &nff, f950

FAULT CODE AIR PRESSURE SWITCH

NOT USED

Next: &nff, f911

FAULT CODE SYSTEM PRESSURE

NOT USED

Next: &nff, f876

FAULT CODE OUTDOOR SENSOR

NOT USED

Next: &nff, f945

FAULT CODE DHW THERMISTOR

NOT USED

Next: &nff, f869

FAULT CODE CH THERMISTOR

NOT USED

Next: &nff, f862

FAULT CODE FLAME OR GAS FAILURE

NOT USED

Next: &nff, !f910

INSPECTION WIRING HARNESS

Next: &3, !f1055

FUSE FURTHER INVESTIGATION - FUSE BLOWN

NOT USED

Next: &nff, f1057

FAULT CODE OVERHEAT 5

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT 2

THERMOSTAT - OVERHEAT SAFETY 130DEG

Next: End

FAULT CODE OVERHEAT 2

THERMOSTAT - OVERHEAT SAFETY 100DEG

Next: End

NO DISPLAY

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

DHW FLOW RATE

KIT - REPAIR - SENSOR FLOW C/W IMPELLOR AND FILTER

Next: End

NO POWER LED

SPINDLE - GREY - PACK OF 10

Next: End

NO DISPLAY 2

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

FAULT CODE OVERHEAT 3

THERMOSTAT - OVERHEAT SAFETY 130DEG

Next: End

FAULT CODE OVERHEAT 4

THERMOSTAT - OVERHEAT SAFETY 100DEG

Next: End

INSPECTION WIRING HARNESS

HARNESS WIRING - BASIC

Next: End

DIVERTER VALVE COMPONENTS

DIVERTER VALVE - FUSE INVESTIGATION

Next: End

FUSE FURTHER INVESTIGATION

MOTOR - 3 - WAY VALVE

Next: End

FUSE FURTHER INVESTIGATION

FAN

Next: End

FUSE FURTHER INVESTIGATION

GAS VALVE

Next: End

FUSE FURTHER INVESTIGATION 2

HARNESS WIRING - BASIC

Next: End

FAN DOES NOT RUN

THERMOSTAT - OVERHEAT SAFETY 130DEG

Next: End

DHW TOO HOT

SENSOR DHW 40 TO 110DEG C

Next: End

DHW MODULATION

SENSOR DHW 40 TO 110DEG C

Next: End

FUSE FURTHER INVESTIGATION 2

GAS VALVE

Next: End

BAFFLES -LIFTS OFF

BURNER

Next: End

BURNER BAFFLES 2

HEAT EXCHANGER - FLUEWAYS

Next: End

BURNER DOES NOT ESTABLISH

BURNER

Next: End

TEMP CONTROL DHW

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

TEMP CONTROL DHW 2

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

TEMP CONTROL DHW 3

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

TEMP CONTROL DHW 4

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

TEMP CONTROL CH 4

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

FAN DOES NOT RUN

PCB - CONTROL BOARD - MAIN

Next: End

FAN DOES NOT RUN 2

HARNESS WIRING - BASIC

Next: End

FAN DOES NOT RUN

KIT - REPAIR - SENSOR FLOW C/W IMPELLOR AND FILTER

Next: End

TEMP CONTROL CH 3

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

BOILER COOL RADS COOL

PCB DIP SWITCHES

Next: End

DHW COOL RADS COOL

PUMP ASSEMBLY

Next: End

DHW COOL RADS COOL

SENSOR DHW 40 TO 110DEG C

Next: End

DHW COOL RADS COOL

SENSOR -5 TO 105DEG C - NTC

Next: End

FAN DOES NOT RUN 2

FAN

Next: End

DOES NOT RESPOND TO CH DEMAND 5

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND 4

TIMER - PROGRAMMER

Next: End

DOES NOT RESPOND TO CH DEMAND 10

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 6

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND 6

TIMER - PROGRAMMER

Next: End

DOES NOT RESPOND TO CH DEMAND 12

HARNESS WIRING - BASIC

Next: End

DHW COOL RADS COOL

GAS INLET PRESSURE

Next: End

DHW COOL RADS COOL

GAS VALVE

Next: End

DHW COOL RADS COOL 2

PCB - CONTROL BOARD - MAIN

Next: End

DHW COOL RADS COOL

GAS VALVE - ADJUSTMENT

Next: End

DHW COOL RADS COOL

BURNER

Next: End

DHW COOL RADS COOL

INJECTOR

Next: End

DHW RUNS HOT THEN COOL

SENSOR DHW 40 TO 110DEG C

Next: End

FAN DOES NOT RUN

SYSTEM PRESSURE

Next: End

DHW RUNS HOT THEN COOL

SENSOR -5 TO 105DEG C - NTC

Next: End

DHW RUNS HOT THEN COOL

GAS INLET PRESSURE

Next: End

DHW RUNS HOT THEN COOL

GAS VALVE

Next: End

DHW RUNS HOT THEN COOL

PCB - CONTROL BOARD - MAIN

Next: End

DHW RUNS HOT THEN COOL

GAS VALVE - ADJUSTMENT

Next: End

BURNER PRESSURE MAX MIN 2

GAS VALVE

Next: End

BURNER PRESSURE MAX MIN

PCB - CONTROL BOARD - MAIN

Next: End

BURNER PRESSURE MAX MIN

GAS VALVE - ADJUSTMENT

Next: End

BOILER COOL RADS COOL 2

PCB - CONTROL BOARD - MAIN

Next: End

BOILER COOL RADS COOL

PCB ONBOARD ADJUSTMENTS

Next: End

BOILER COOL RADS COOL

SENSOR -5 TO 105DEG C - NTC

Next: End

FAULT CODE OUTDOOR SENSOR

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE DHW THERMISTOR

HARNESS WIRING - BASIC

Next: End

FAN DOES NOT RUN

SWITCH - PRESSURE - AIR

Next: End

FAN DOES NOT RUN

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

FAN DOES NOT RUN

SENSOR -5 TO 105DEG C - NTC

Next: End

FAN DOES NOT RUN

SENSOR DHW 40 TO 110DEG C

Next: End

FAULT CODE APS

SWITCH - PRESSURE - AIR

Next: End

FAULT CODE APS 3

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

TEMP CONTROL DHW 5

CABLE-MAIN BOARD TO INTERFACE BOARD

Next: End

BURNER BAFFLES

DIAPHRAGM

Next: End

BURNER BAFFLES 2

DIAPHRAGM

Next: End

FAN DOES NOT RUN

THERMOSTAT - OVERHEAT SAFETY 100DEG

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

PUMP DOES NOT RUN

PCB - CONTROL BOARD - MAIN

Next: End

OPERATIONAL SEQUENCE

DIRECTION CHOICE OR CONTINUE

Next: End

PUMP DOES NOT RUN

HARNESS WIRING - BASIC

Next: End

BURNER DOES NOT IGNITE

HEAT EXCHANGER - FLUEWAYS

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

BURNER DOES NOT IGNITE

GAS INLET PRESSURE

Next: End

BURNER DOES NOT IGNITE 3

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

BURNER DOES NOT IGNITE

FAN

Next: End

BURNER DOES NOT IGNITE 2

HEAT EXCHANGER - FLUEWAYS

Next: End

BURNER DOES NOT IGNITE

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

BURNER DOES NOT IGNITE 2

HARNESS WIRING - BASIC

Next: End

FAULT CODES

Z REDIRECTION

Next: End

BURNER DOES NOT IGNITE 2

GAS INLET PRESSURE

Next: End

BURNER DOES NOT IGNITE

POTENTIOMETER P4 - ADJUSTMENT

Next: End

BURNER DOES NOT IGNITE 4

GAS VALVE

Next: End

BURNER DOES NOT IGNITE 5

GAS VALVE

Next: End

FAN RUNS CONTSTANTLY

SENSOR -5 TO 105DEG C - NTC

Next: End

INITIAL SETUP

DIRECTION CHOICE OR CONTINUE

Next: End

BURNER NOT CROSS LIGHTING

BURNER

Next: End

BURNER DOES NOT CROSS LIGHT

GAS INLET PRESSURE

Next: End

BURNER DOES NOT CROSS LIGHT 2

GAS VALVE

Next: End

BURNER DOES NOT CROSS LIGHT

GAS VALVE

Next: End

BURNER DOES NOT CROSS LIGHT

POTENTIOMETER P4 - ADJUSTMENT

Next: End

BURNER DOES NOT EST

ELECTRODE - CONTROL - FLAME

Next: End

BURNER DOES NOT EST

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT EST 2

ELECTRODE - CONTROL - FLAME

Next: End

BURNER BAFFLES

GAS INLET PRESSURE

Next: End

BURNER BAFFLES

GAS VALVE

Next: End

BURNER BAFFLES 2

GAS VALVE

Next: End

BURNER BAFFLES

HEAT EXCHANGER - FLUEWAYS

Next: End

DHW TOO HOT

SENSOR -5 TO 105DEG C - NTC

Next: End

DHW COOL RADS HOT

HARNESS WIRING - BASIC

Next: End

DHW COOL RADS HOT

PCB - CONTROL BOARD - MAIN

Next: End

DHW COOL RADS COOL

SYSTEM PRESSURE

Next: End

CASE OFF

DIRECTION CHOICE OR CONTINUE

Next: End

BOILER FIRES NO DEMAND

Next: End

DHW RUNS HOT THEN COLD

SYSTEM PRESSURE

Next: End

DHW RUNS HOT THEN COLD

PUMP ASSEMBLY

Next: End

EXCESSIVE SYSTEM PRESSURE

EXPANSION VESSEL 7 LITRE

Next: End

BOILER TO TEMP RADS DO NOT HEAT

SYSTEM PRESSURE

Next: End

BOILER TO TEMP RADS DO NOT HEAT

SET - VALVES

Next: End

BOILER TO TEMP RADS DO NOT HEAT

PUMP ASSEMBLY

Next: End

BOILER TO TEMP RADS DO NOT HEAT

3 WAY VALVE SERVICE KIT

Next: End

BOILER TO TEMP RADS DO NOT HEAT

PCB - CONTROL BOARD - MAIN

Next: End

BOILER TO TEMP RADS DO NOT HEAT

HARNESS WIRING - BASIC

Next: End

BOILER TO TEMP RADS DO NOT HEAT

Next: End

BOILER TO TEMP RADS DO NOT HEAT 2

SET - VALVES

Next: End

BOILER TO TEMP RADS DO NOT HEAT 3

SET - VALVES

Next: End

DOES NOT RESPOND TO CH DEMAND 2

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND 4

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 2

TIMER - PROGRAMMER

Next: End

BOILER FIRES WITH NO DEMAND

DHW SYSTEM

Next: End

DOES NOT RESPOND TO CH DEMAND

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND

TIMER - PROGRAMMER

Next: End

DOES NOT RESPOND TO CH DEMAND

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 3

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND 3

TIMER - PROGRAMMER

Next: End

DOES NOT RESPOND TO CH DEMAND 9

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 4

CONNECTOR X20

Next: End

DOES NOT RESPOND TO CH DEMAND 5

TIMER - PROGRAMMER

Next: End

DOES NOT RESPOND TO CH DEMAND 11

HARNESS WIRING - BASIC

Next: End

BURNER PRESSURE MAX MIN

GAS INLET PRESSURE

Next: End

BURNER DOES NOT IGNITE

DIAPHRAGM

Next: End

BURNER DOES NOT IGNITE

FLUE ASSEMBLY

Next: End

NO DISPLAY

PCB FUSES

Next: End

NO DISPLAY

FUSE - FUSED SPUR

Next: End

BOILER FIRES NO DEMAND

SENSOR FLOW

Next: End

FAULT CODE CH THERMISTOR

SENSOR -5 TO 105DEG C - NTC

Next: End

FAULT CODE CH THERMISTOR

PCB - CONTROL BOARD - MAIN

Next: End

SELF TEST

FROST PROTECT NORMAL OPERATION

Next: End

FAULT CODE DHW THERMISTOR

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE SYSTEM PRESSURE

SYSTEM PRESSURE

Next: End

BOILER FIRES WITH DEMAND

SENSOR -5 TO 105DEG C - NTC

Next: End

FAULT CODE SYSTEM PRESSURE

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE FLAME OR GAS FAILURE

Z REDIRECTION

Next: End

DHW FLOW RATE

SET - VALVES

Next: End

FAULT CODE APS 3

FAN

Next: End

FAULT CODE APS

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

FAULT CODE APS 2

FAN

Next: End

FAULT CODE APS

HEAT EXCHANGER - FLUEWAYS

Next: End

FAULT CODE APS

DIAPHRAGM

Next: End

DHW FLOW RATE

COLD WATER SUPPLY

Next: End

FAULT CODE APS

FLUE ASSEMBLY

Next: End

FAULT CODE APS 2

HOSE SILICON - AIR SWITCH CONNECTION

Next: End

FAULT CODE APS

HARNESS WIRING - BASIC

Next: End

FAULT CODE OVERHEAT

SYSTEM PRESSURE

Next: End

FAULT CODE OVERHEAT

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT

HARNESS WIRING - BASIC

Next: End

FAULT CDOE OVERHEAT 2

PUMP ASSEMBLY

Next: End

FAULT CODE OVERHEAT

Next: End

FAULT CODE OVERHEAT

SENSOR -5 TO 105DEG C - NTC

Next: End

FAULT CODE OVERHEAT

PCB DIP SWITCHES

Next: End

FAULT CODE OVERHEAT

HEAT EXCHANGER

Next: End

FAULT CODE OVERHEAT

THERMOSTAT - OVERHEAT SAFETY 130DEG

Next: End

FAULT CODE OVERHEAT

THERMOSTAT - OVERHEAT SAFETY 100DEG

Next: End

FAULT CODE OVERHEAT

Z REDIRECTION

Next: End

FAULT CODE OVERHEAT 2

HARNESS WIRING - BASIC

Next: End

DHW FLOW RATE

HEAT EXCHANGER - PLATE TYPE 24KW

Next: End

NO DISPLAY 3

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT 2

Z REDIRECTION

Next: End

FAULT CODE OVERHEAT 3

HARNESS WIRING - BASIC

Next: End

FUSE FURTHER INVESTIGATION

HARNESS WIRING - BASIC

Next: End

FUSE FURTHER INVESTIGATION 3

HARNESS WIRING - BASIC

Next: End

FUSE FURTHER INVESTIGATION 4

HARNESS WIRING - BASIC

Next: End

FAULT CODE OVERHEAT 6

PCB - CONTROL BOARD - MAIN

Next: End

FUSE FURTHER INVESTIGATION

PUMP ASSEMBLY

Next: End

FAULT CODE OVERHEAT 3

Z REDIRECTION

Next: End

FUSE FURTHER INVESTIGATION 5

HARNESS WIRING - BASIC

Next: End

BURNER DOES NOT IGNITE 3

GAS VALVE

Next: End

FUSE FURTHER INVESTIGATION

PCB - CONTROL BOARD - MAIN - FUSE INV

Next: End

BURNER BAFFLES 2

GASKET - FAN

Next: End

BURNER BAFFLES 2

ELBOW 56 DEG

Next: End

DHW COOL RADS COOL

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL DHW

PCB - INTERFACE BOARD

Next: End

DHW COOL RADS COOL 2

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL DHW 2

PCB - INTERFACE BOARD

Next: End

DHW COOL RADS COOL 3

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL DHW 3

PCB - INTERFACE BOARD

Next: End

DHW COOL RADS COOL 4

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL DHW 4

PCB - INTERFACE BOARD

Next: End

DHW COOL RADS COOL 6

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL CH 4

PCB - INTERFACE BOARD

Next: End

FAN DOES NOT RUN

SENSOR FLOW

Next: End

FAN DOES NOT RUN

FAN

Next: End

TEMP CONTROL CH

PCB - INTERFACE BOARD

Next: End

BOILER COOL RADS COOL

SPINDLE - WHITE - PACK OF 10

Next: End

FAN DOES NOT RUN

HARNESS WIRING - BASIC

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER - PLATE TYPE 24KW

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER

Next: End

DOES NOT RESPOND TO CH DEMAND 8

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 4

PCB - CONTROL BOARD - MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 3

Next: End

DOES NOT RESPOND TO CH DEMAND 6

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 6

PCB - CONTROL BOARD - MAIN

Next: End

DHW COOL RADS COOL 2

HARNESS WIRING - BASIC

Next: End

DHW COOL RADS COOL 2

GAS VALVE

Next: End

DHW COOL RADS COOL

Z REDIRECTION

Next: End

DHW COOL RADS COOL

PCB - CONTROL BOARD - MAIN

Next: End

DHW RUNS HOT THEN COOL 2

PCB - CONTROL BOARD - MAIN

Next: End

DHW RUNS HOT THEN COOL 2

HARNESS WIRING - BASIC

Next: End

FAN DOES NOT RUN 3

HARNESS WIRING - BASIC

Next: End

DHW RUNS HOT THEN COOL 2

GAS VALVE

Next: End

DHW RUNS HOT THEN COOL

Z REDIRECTION

Next: End

BURNER PRESSURE MAX MIN

HARNESS WIRING - BASIC

Next: End

BURNER PRESSURE MAX MIN

GAS VALVE

Next: End

BURNER PRESSURE MAX MIN

Z REDIRECTION

Next: End

DHW MODULATION

PCB - CONTROL BOARD - MAIN

Next: End

BOILER COOL RADS COOL

Z REDIRECTION

Next: End

BOILER COOL RADS COOL

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT 3

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OUTDOOR SENSOR 2

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OUTDOOR SENSOR

OUTDOOR SENSOR

Next: End

FAULT CODE DHW THERMISTOR

SENSOR DHW 40 TO 110DEG C

Next: End

FAN DOES NOT RUN

FAN VENTURI

Next: End

FAN DOES NOT RUN 2

PCB - CONTROL BOARD - MAIN

Next: End

FAN DOES NOT RUN 5

HARNESS WIRING - BASIC

Next: End

FAULT CODE APS

FAN VENTURI

Next: End

FAN DOES NOT RUN

SWITCH - LOW WATER

Next: End

FAULT CODE APS 3

HARNESS WIRING - BASIC

Next: End

FAULT CODE APS

PCB - CONTROL BOARD - MAIN

Next: End

DHW COOL RADS COOL 7

SPINDLE - WHITE - PACK OF 10

Next: End

TEMP CONTROL DHW 5

PCB - INTERFACE BOARD

Next: End

DHW TOO HOT

PCB - CONTROL BOARD - MAIN

Next: End

BURNER BAFFLES

FLUE ASSEMBLY

Next: End

BURNER BAFFLES 2

FLUE ASSEMBLY

Next: End

FAN DOES NOT RUN

HOUSING - FLOW SENSOR

Next: End

FAN DOES NOT RUN 2

SWITCH - LOW WATER

Next: End

FAN DOES NOT RUN 4

HARNESS WIRING - BASIC

Next: End

PUMP DOES NOT RUN

PUMP ASSEMBLY

Next: End

BURNER DOES NOT IGNITE

INJECTOR

Next: End

BURNER DOES NOT IGNITE

ELECTRODE - IGNITION - LH

Next: End

BURNER DOES NOT IGNITE

ELECTRODE - IGNITION - RH

Next: End

BURNER DOES NOT IGNITE 2

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT IGNITE

SWITCH - PRESSURE - AIR

Next: End

FAULT CODES

DIRECTION CHOICE OR CONTINUE

Next: End

BURNER DOES NOT IGNITE 2

Z REDIRECTION

Next: End

FAN RUNS CONTSTANTLY

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT IGNITE 4

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT IGNITE 4

HARNESS WIRING - BASIC

Next: End

FAN RUNS CONSTANTLY

HARNESS WIRING - BASIC

Next: End

BURNER NOT CROSS LIGHTING

INJECTOR

Next: End

BURNER DOES NOT CROSS LIGHT

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT CROSS LIGHT

HARNESS WIRING - BASIC

Next: End

BURNER DOES NOT LIGHT

Z REDIRECTION

Next: End

BURNER DOES NOT EST 2

PCB - CONTROL BOARD - MAIN

Next: End

BURNER BAFFLES

Z REDIRECTION

Next: End

BURNER BAFFLES

GASKET - FAN

Next: End

BURNER BAFFLES

ELBOW 56 DEG

Next: End

BURNER DOES NOT IGNITE

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT IGNITE 2

ELECTRODE - IGNITION - RH

Next: End

BURNER DOES NOT IGNITE 2

ELECTRODE - IGNITION - LH

Next: End

DHW COOL RADS HOT

3 WAY VALVE SERVICE KIT

Next: End

DHW COOL RADS HOT

MOTOR - 3 - WAY VALVE

Next: End

DHW RUNS HOT THEN COLD

HEAT EXCHANGER - PLATE TYPE 24KW

Next: End

DHW RUNS HOT THEN COOL

HEAT EXCHANGER

Next: End

EXCESSIVE SYSTEM PRESSURE

HOSE STAINLESS STEEL - FLEXIBLE BRAIDED

Next: End

BOILER TO TEMP RADS DO NOT HEAT

MOTOR - 3 - WAY VALVE

Next: End

BOILER TO TEMP RADS DO NOT HEAT

VALVE BLOCK - 3WAY - BYPASS

Next: End

BOILER TO TEMP RADS DO NOT HEAT

Next: End

DOES NOT RESPOND TO CH DEMAND 2

PCB - CONTROL BOARD - MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 3

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 2

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND

PCB - CONTROL BOARD - MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND

Next: End

DOES NOT RESPOND TO CH DEMAND 7

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 3

PCB - CONTROL BOARD - MAIN

Next: End

DOES NOT RESPOND TO CH DEMAND 2

Next: End

DOES NOT RESPOND TO CH DEMAND 5

HARNESS WIRING - BASIC

Next: End

DOES NOT RESPOND TO CH DEMAND 5

PCB - CONTROL BOARD - MAIN

Next: End

BURNER DOES NOT IGNITE 3

FAN

Next: End

NO DISPLAY

Next: End

FURTHER INVESTIGATION FUSE 2

Z REDIRECTION

Next: End

FURTHER INVESTIGATION PCB FUSE

Z REDIRECTION

Next: End

NO DISPLAY 2

PCB - CONTROL BOARD - MAIN

Next: End

NO DISPLAY

PCB - INTERFACE BOARD

Next: End

NO DISPLAY

Z REDIRECTION

Next: End

NO DISPLAY 2

Z REDIRECTION

Next: End

FAULT CODE CH THERMISTOR

HARNESS WIRING - BASIC

Next: End

CH THERMISTOR

FAULT CODE RESET

Next: End

DHW THERMISTOR

FAULT CODE RESET

Next: End

BOILER FIRES WITH NO DEMAND

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE SYSTEM PRESSURE

HARNESS WIRING - BASIC

Next: End

FAULT CODE SYSTEM PRESSURE 2

SWITCH - LOW WATER

Next: End

FAULT CODE SYSTEM PRESSURE

SWITCH - LOW WATER

Next: End

FAULT CODE SYSTEM PRESSURE

HOUSING - FLOW SENSOR

Next: End

SYSTEM PRESSURE

FAULT CODE RESET

Next: End

FAULT CODE APS 4

FAN

Next: End

FAULT CODE APS 2

HARNESS WIRING - BASIC

Next: End

FAULT CODE APS 2

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE APS

FAN

Next: End

FAULT CODE APS 2

SWITCH - PRESSURE - AIR

Next: End

OUTDOOR SENSOR

FAULT CODE RESET

Next: End

FAULT CODE OVERHEAT

PUMP ASSEMBLY

Next: End

FAULT CODE OVERHEAT

HEAT EXCHANGER - PLATE TYPE 24KW

Next: End

FAULT CODE OVERHEAT

OVERHEAT - SHUTS DOWN AT TEMP

Next: End

FAULT CODE OVERHEAT 2

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT 4

PCB - CONTROL BOARD - MAIN

Next: End

FAULT CODE OVERHEAT

FAULT CODE RESET

Next: End

FAN OUTLET GASKET INSPECTION FAIL

CHARACTERISTIC TEST FROM INSPECTION GASKETS COMBUSTION

Next: !p1157

ELBOW 56 DEGREE GASKET INSPECTION FAIL

CHARACTERISTIC TEST FROM INSPECTION GASKETS COMBUSTION

Next: !p1159

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1187

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1189

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1248

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1250

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1276

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1278

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1296

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1298

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS DHW DEMAND

Next: p134

FAN RUNS FOR APPROX 1 SECOND THEN STOPS AND DOESN'T RESTART

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNS DHW DEMAND

Next: p1042

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1321

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1458

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1346

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1348

TEMPERATURE DIFFERENTIAL EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM INSPECTION SPARK ELECTRODES

Next: !p1474

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1476

VOLTAGE DOES NOT BEHAVE AS ABOVE - POTENTIOMETER ROTATES

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: p1597

POTENTIOMETER DOES NOT ROTATE (SPINDLE BROKEN)

CHARACTERISTIC TEST FROM VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

Next: !p1599

BLOCKAGE - LOW WATER PRESSURE SWITCH

CHARACTERISTIC TEST FROM INSPECTION SWITCH WATER PRESSURE MANIFOLD

Next: !p164

BLOCKAGE - WATER MANIFOLD

CHARACTERISTIC TEST FROM INSPECTION SWITCH WATER PRESSURE MANIFOLD

Next: !p163

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p202

BURNER IGNITES BUT EXTINGUISHES - AFTER 3 ATTEMPS LOCKOUT OCCURS

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p204

BURNER IGNITES BUT BAFFLES AND/OR FLAME LIFTS OFF

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION & ESTABLISH

Next: p434

FAULT CODE FLASHING

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p23

LEFT HAND SPARK ELECTRODE INSPECTION UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SPARK ELECTRODES

Next: !p233

RIGHT HAND SPARK ELECTRODE INSPECTION UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION SPARK ELECTRODES

Next: !p235

BOILER FIRES WITH NO DEMANDS PRESENT

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p53

BURNER PRESSURE IGNITION RATE ABSENT

CHARACTERISTIC TEST FROM PRESSURE GAS VALVE - IGNITION

Next: p259

FAN RUNS CONSTANTLY WITH NO DEMAND PRESENT

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p32

BURNER PRESSURE IGNITION RATE PRESENT BUT INCORRECT PRESSURE

CHARACTERISTIC TEST FROM PRESSURE GAS VALVE - IGNITION

Next: p316

BURNER NOT CROSS LIGHTING

CHARACTERISTIC TEST FROM OBSERVATION BURNER

Next: p375

BURNER BAFFLES AND/OR LIFTS OFF

CHARACTERISTIC TEST FROM OBSERVATION BURNER

Next: p1150

FAN OUTLET GASKET INSPECTION FAIL

CHARACTERISTIC TEST FROM INSPECTION GASKETS COMBUSTION

Next: !p448

ELBOW 56 DEGREE GASKET INSPECTION FAIL

CHARACTERISTIC TEST FROM INSPECTION GASKETS COMBUSTION

Next: !p450

RIGHT ELECTRODE - RESISTANCE NOT AS EXPECTED AND/OR LEAD DAMAGED

CHARACTERISTIC TEST FROM RESISTANCE ELECTRODES AND LEADS

Next: !p465

LEFT ELECTRODE - RESISTANCE NOT AS EXPECTED AND/OR LEAD DAMAGED

CHARACTERISTIC TEST FROM RESISTANCE ELECTRODES AND LEADS

Next: !p467

DHW COOL, RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p469

DHW COOL, RADIATORS COOL

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p494

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p473

DHW RUNS HOT THEN COOL

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p565

POWER ON LED NOT ILLUMINATED

CHARACTERISTIC TEST FROM POWER UP SELF TEST

Next: p49

TEMPERATURE DIFFERENTIAL EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM INSPECTION SPARK ELECTRODES

Next: !p615

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION

Next: p758

BOILER REACHES TEMPERATURE RADIATORS DO NOT HEAT SUFFICIENTLY

CHARACTERISTIC TEST FROM CH OPERATION

Next: p657

EXCESSIVE SYSTEM PRESSURE AS CH TEMPERATURE RISES

CHARACTERISTIC TEST FROM CH OPERATION

Next: p659

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION

Next: p666

BOILER AND RADIATOR TEMPERATURE LOW

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1301

BOILER RESPONDS BUT DOES NOT OPERATE CORRECTLY

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESPONDS TO A DEMAND

Next: !p853

BOILER DOES NOT RESPOND

CHARACTERISTIC TEST FROM OBSERVATION BOILER RESPONDS TO A DEMAND

Next: !p855

BLOCKAGE - LOW WATER PRESSURE SWITCH

CHARACTERISTIC TEST FROM INSPECTION SWITCH WATER PRESSURE MANIFOLD

Next: !p904

BLOCKAGE - WATER MANIFOLD

CHARACTERISTIC TEST FROM INSPECTION SWITCH WATER PRESSURE MANIFOLD

Next: !p906

BOILER GOES TO OVERHEAT - TEMPERATURE BELOW 82°C

CHARACTERISTIC TEST FROM RUN BOILER TO MAX TEMP - DOES OVERHEAT OCCUR

Next: p977

BOILER FLOW TEMPERATURE EXCEEDS 82°C AND BOILER STILL FIRED

CHARACTERISTIC TEST FROM RUN BOILER TO MAX TEMP - DOES OVERHEAT OCCUR

Next: p979

16/05/2017 15:21:25 1704_1_50_1 19/05/2017 08:24:05

17/05/2017 09:33:48

Next: End

RESET OVERHEAT STAT - HEAT EXCHANGER

REMOVE LEADS FROM HE

Next: !p1003, !f1004

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1039, !f1040

RESISTANCE OVERHEAT STAT - HEAT EXCHANGER

REMOVE LEADS FROM HEAT EXCHANGER OVERHEAT STAT

Next: p1045, f1046

RESET OVERHEAT STAT - HEAT EXCHANGER - FAN DOES NOT RUN

REMOVE LEADS FROM HE

Next: !p1047, !f1048

INSPECTION DIVERTER VALVE ACTUATOR - FUSE FURTHER INVESTIGATION

REMOVE DIVERTER VALV

Next: p1067, !f1066

RESISTANCE DIVERTER VALVE ACTUATOR

REMOVE DIVERTER VALVE ACTUATOR AND DISCONNECT ELECTRICAL CONNECTOR

Next: !p1070, !f1071

RESISTANCE PUMP HARNESS - FUSE FURTHER INVESTIGATION

REMOVE CONNECTOR X12 FROM THE PCB
REMOVE ELECTRICAL CONNECTIONS ON THE PUMP ASSEMBLY

Next: !p1091, !f1090

RESISTANCE FAN ASSEMBLY - FUSE FURTHER INVESTIGATION

REMOVE LEFT HAND SIDE PANEL
DISCONNECT FAN LEADS

Next: !p1078, !f1079

RESISTANCE GAS VALVE

REMOVE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1085, !f1086

RESET OVERHEAT STAT - HEAT EXCHANGER - FAN DOES NOT RUN

REMOVE LEADS FROM HE

Next: !p1093, !f1094

RESISTANCE GAS VALVE

REMOVE ELECTRICAL CONNECTOR FROM THE GAS VALVE

Next: !p1127, !f1128

VOLTAGE DHW FLOW SENSOR RETURN AT PCB

{GAINPCBACS}

Next: p137, f138

VOLTAGE DHW SENSOR SEND AT PCB

Next: p139, !f140

RESISTANCE FAN ASSEMBLY

REMOVE LEFT HAND SIDE PANEL
DISCONNECT FAN LEADS

Next: !p147, !f148

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - CH

CH TEMPERATURE SET T

Next: !p1472, ?1473, ?1475

OBSERVATION CONNECTOR X20 FITTED

Next: p1479, !f1480

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p1483, !f1484

OBSERVATION CONNECTOR X20 FITTED

Next: p1489, !f1490

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p1493, !f1494

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1499, !f1500

OBSERVATION SYSTEM PRESSURE

Next: p151, !f152

RESISTANCE GAS VALVE MODULATION COIL AND HARNESS

REMOVE X9 CONNECTOR FROM THE PCB

Next: p1503, f1504

RESISTANCE GAS VALVE MODULATION COIL

REMOVE MODUREG LEADS FROM GAS VALVE

Next: !p1505, !f1506

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1523, !f1524

RESISTANCE GAS VALVE MODULATION COIL AND HARNESS

REMOVE X9 CONNECTOR FROM THE PCB

Next: p1527, f1528

RESISTANCE GAS VALVE MODULATION COIL

REMOVE MODUREG LEADS FROM GAS VALVE

Next: !p1529, !f1530

RESISTANCE GAS VALVE MODULATION COIL AND HARNESS

REMOVE X9 CONNECTOR FROM THE PCB

Next: p1539, f1540

RESISTANCE GAS VALVE MODULATION COIL

REMOVE MODUREG LEADS FROM GAS VALVE

Next: !p1541, !f1542

CH OUTPUT PCB ADJUSTMENT

CH TEMPERATURE CONTROL SET TO MAX
ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1553, !f1554

OBSERVATION OUTDOOR SENSOR FITTED

{GAINPCBACS}

Next: !p1562, f1564

DISCONNECT OUTDOOR SENSOR

DISCONNECT OUTDOOR SENSOR FROM CONNECTOR X6 ON THE PCB AND MAKE SAFE

Next: !p1565, !f1566

RESISTANCE SWITCH AIR PRESSURE

DISCONNECT LEADS TO THE AIR PRESSURE SWITCH (NOTE THEIR LOCATIONS)

Next: !p1581, f1571

DISCONNECT AIR PRESSURE TUBE

REMOVE TUBE TO AIR PRESSURE SWITCH
REMOVE LEADS TO THE AIR PRESSURE SWITCH (NOTE THEIR LOCATIONS)

Next: p1572, !f1573

INSPECTION SWITCH WATER PRESSURE MANIFOLD

DRAIN SYSTEM WATER F

Next: !p159, ?160, ?162

RESISTANCE SWITCH AIR PRESSURE AND HARNESS

REMOVE CONNECTOR X16 FROM THE PCB

Next: !p1592, f1583

RESISTANCE SWITCH AIR PRESSURE

DISCONNECT LEADS TO THE AIR PRESSURE SWITCH (NOTE THEIR LOCATIONS)

Next: !p1591, f1585

DISCONNECT AIR PRESSURE TUBE

REMOVE TUBE TO AIR PRESSURE SWITCH
REMOVE LEADS TO THE AIR PRESSURE SWITCH (NOTE THEIR LOCATIONS)

Next: p1586, !f1587

RESISTANCE OVERHEAT STAT - HEAT EXCHANGER

REMOVE LEADS FROM HEAT EXCHANGER OVERHEAT STAT

Next: p167, f1092

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p197, !f198

INSPECTION SPARK ELECTRODES

Next: p460, ?232, ?234

VOLTAGE SWITCH AIR PRESSURE (AIR PROVING)

{GAINPCBACS}
SET SELECTOR SWITCH TO THE OFF POSITION

Next: !p264, f265

PRESSURE DIFFERENTIAL - EXHAUST / AIR INTAKE

ENSURE COMBUSTION CO

Next: p266, f267

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: p268, !f269

RESISTANCE GAS VALVE MODULATION COIL AND HARNESS

REMOVE X9 CONNECTOR FROM THE PCB

Next: !p334, f335

RESISTANCE GAS VALVE MODULATION COIL

REMOVE MODUREG LEADS FROM GAS VALVE

Next: !p336, !f337

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: !p35, !f36

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p416, !f417

RESISTANCE GAS VALVE MODULATION COIL AND HARNESS

REMOVE X9 CONNECTOR FROM THE PCB

Next: !p422, f423

RESISTANCE GAS VALVE MODULATION COIL

REMOVE MODUREG LEADS FROM GAS VALVE

Next: !p424, !f425

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p437, !f438

VOLTAGE ACTUATOR AT PCB

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM THE DIVERTER VALVE ACTUATOR
AND MAKE SAFE

Next: p488, !f491

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - CH

CH TEMPERATURE SET T

Next: !p572, ?611, ?613

VOLTAGE ACTUATOR AT PCB - CH

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR FROM THE DIVERTER VALVE ACTUATOR
AND MAKE SAFE

Next: p679, !f680

INSPECTION FILTER RETURN

DRAIN PRIMARY CIRCUIT
REMOVE SYSTEM FILTER FROM RETURN ISOLATION VALVE

Next: !p703, !f704

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: p1293, !f1106

OBSERVATION CONNECTOR X20 FITTED

Next: p736, !f737

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p746, !f744

OBSERVATION CONNECTOR X20 FITTED

Next: p749, !f750

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p753, !f754

OBSERVATION CONNECTOR X20 FITTED

Next: p761, !f762

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p765, !f766

OBSERVATION CONNECTOR X20 FITTED

Next: p771, !f772

RESISTANCE SWITCH TIMER PROGRAMMER

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE LEADS 4 & 3 FROM THE TIMER PROGRAMMER

Next: !p775, !f776

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1273, !f808

VOLTAGE MAINS POWER INPUT AT PCB

Next: p830, f831

RESISTANCE FUSE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p834, f835

FUSE FURTHER INVESTIGATION

THE INFORMATION PROV

Next: !p840, !f844

FUSE FURTHER INVESTIGATION

THE INFORMATION PROV

Next: !p838, !f839

RESISTANCE THERMISTOR FLOW AND HARNESS

REMOVE CONNECTOR X9 FROM THE PCB

Next: p863, f864

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: !p865, !f866

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: p870, f871

RESISTANCE HARNESS DHW THERMISTOR

REMOVE CONNECTOR X9 FROM THE PCB
REMOVE CONNECTOR FROM DHW THERMISTOR

Next: !p1568, !f1567

OBSERVATION SYSTEM PRESSURE

Next: p897, !f878

RESISTANCE SWITCH WATER PRESSURE

DISCONNECT LEADS TO THE LOW WATER PRESSURE SWITCH
(MAKE A NOTE OF THEIR CONNECTIONS)

Next: !p900, f901

OBSERVATION DHW ISOLATION VALVE

Next: p91, !f92

INSPECTION SWITCH WATER PRESSURE MANIFOLD

DRAIN SYSTEM WATER F

Next: !p902, ?903, ?905

OBSERVATION FAN RUNS

DHW TEMPERATURE SET TO MAX

Next: p926, f919

VOLTAGE FAN AT PCB

{GAINPCBACS}

Next: p920, f1582

RESISTANCE FAN ASSEMBLY

REMOVE LEFT HAND SIDE PANEL
DISCONNECT FAN LEADS

Next: !p923, !f924

PRESSURE DIFFERENTIAL - EXHAUST / AIR INTAKE

ENSURE COMBUSTION CO

Next: p929, f930

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: p931, !f932

RESET APPLIANCE FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p946, f1561

RESET APPLIANCE - FAULT CODE OVERHEAT

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: p953, f952

RESISTANCE STATS OVERHEAT AND HARNESS

REMOVE CONNECTOR X9 FROM THE PCB

Next: p997, f998

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p958, !f959

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - CH

CH TEMPERATURE SET T

Next: !p968, !f986

OBSERVATION PCB DIP SWITCHES

Next: !p984, !f985

RESISTANCE OVERHEAT STAT - HEAT EXCHANGER

REMOVE LEADS FROM HEAT EXCHANGER OVERHEAT STAT

Next: p1001, f1002

RESISTANCE OVERHEAT STAT - FLOW PIPE

REMOVE CONNECTORS FROM THE FLOW PIPE OVERHEAT STAT

Next: !p1005, !f1007

INSPECTION SELECTOR CONTROL KNOB

GAIN ACCESS TO INTERFACE PCB

Next: p843, !f1036

RESISTANCE STATS OVERHEAT AND HARNESS

REMOVE CONNECTOR X9 FROM THE PCB

Next: !p1089, f1044

RESISTANCE OVERHEAT STAT - FLOW PIPE

REMOVE CONNECTORS FROM THE FLOW PIPE OVERHEAT STAT

Next: !p1049, !f1050

RESISTANCE DIVERTER VALVE ACTUATOR AND HARNESS

REMOVE CONNECTOR X19 FROM THE PCB

Next: p1068, f1069

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTOR X12 FROM THE PCB

Next: p1072, f1073

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR X12 FROM THE PCB

Next: p1076, f1077

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X17 FROM THE PCB

Next: !p1138, f1081

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR X17 FROM THE PCB

Next: !p1129, f1126

INSPECTION BURNER ASSEMBLY

Next: p435, !f1149

INSPECTION BURNER ASSEMBLY

Next: p1151, !f1160

INSPECTION FLUEWAYS MAIN HEAT EXCHANGER

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p1152, !f1153

INSPECTION GASKETS COMBUSTION

Next: p1624, ?1156, ?1158

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1190, !f1191

VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: p1516, ?1247, ?1249

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1251, !f1252

VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: p1536, ?1275, ?1277

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1279, !f1280

VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: !p1548, ?1295, ?1297

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1299, !f1300

OBSERVATION PCB DIP SWITCHES

Next: p1318, !f1461

VOLTAGE CH TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: p1550, ?1320, ?1322

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1457, !f1456

VOLTAGE FAN AT PCB

{GAINPCBACS}

Next: p135, f136

VOLTAGE CH TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: !p1560, ?1345, ?1347

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1349, !f1350

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR X12 FROM THE PCB

Next: !p145, f146

RESISTANCE SWITCH WATER PRESSURE AND HARNESS

REMOVE CONNECTOR X16 FROM THE PCB

Next: p149, f150

RESISTANCE HARNESS DHW FLOW SENSOR

REMOVE CONNECTOR X10 FROM THE PCB
REMOVE CONNECTOR FROM THE DHW FLOW SENSOR

Next: p141, !f142

INSPECTION FLOW VALVE ASSEMBLY - NO DHW DEMAND

ISOLATE COLD FEED TO BOILER
DRAIN DHW CIRCUIT
DISASSEMBLE DHW FLOW MANIFOLD

Next: !p143, !f144

PUMP LIMPET

Next: p1464, !f1465

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: p1466, !f1467

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: p1468, !f1469

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - DHW

DHW TEMPERATURE SET

Next: p1470, f1471

PRESSURE GAS VALVE MAXIMUM & MINIMUM

DISCONNECT ONE LEAD

Next: p1497, f1498

OBSERVATION INTERNAL OR EXTERNAL CONTROLS FITTED

Next: p1477, f1478

BYPASS EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROL WIRING, LEAVE IN A SAFE PLACE
LINK OUT EXTERNAL CONTROLS (WIRE LINK)

Next: !p1487, f1488

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p1481, f1482

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p1485, !f1486

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p1491, f1492

RESISTANCE STATS OVERHEAT AND HARNESS

REMOVE CONNECTOR X9 FROM THE PCB

Next: p1569, f166

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p1495, !f1496

INSPECTION BURNER ASSEMBLY

Next: p1511, !f1512

PRESSURE GAS VALVE - ADJUSTMENT MAX & MIN

DISCONNECT ONE LEAD

Next: p1501, f1502

PRESSURE GAS VALVE - MAX & MIN ADJUSTED CORRECTLY - DHW

THE MAXIMUM AND/OR M

Next: !p1509, !f1510

VOLTAGE GAS VALVE MODULATION COIL - MAX

Next: !p1507, !f1508

RESISTANCE SWITCH WATER PRESSURE

DISCONNECT LEADS TO THE LOW WATER PRESSURE SWITCH
(MAKE A NOTE OF THEIR CONNECTIONS)

Next: !p153, f158

INSPECTION INJECTOR

REMOVE BURNER ASSEMBLY

Next: !p1513, !f1514

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: p1517, !f1518

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: p1519, !f1520

PRESSURE GAS VALVE MAXIMUM & MINIMUM

DISCONNECT ONE LEAD

Next: !p1521, f1522

PRESSURE GAS VALVE - ADJUSTMENT MAX & MIN

DISCONNECT ONE LEAD

Next: p1525, f1526

PRESSURE GAS VALVE - MAX & MIN ADJUSTED CORRECTLY - DHW

THE MAXIMUM AND/OR M

Next: !p1533, !f1534

VOLTAGE GAS VALVE MODULATION COIL - MAX

Next: !p1531, !f1532

PRESSURE GAS VALVE - ADJUSTMENT MAX & MIN

DISCONNECT ONE LEAD

Next: p1537, f1538

PRESSURE GAS VALVE - MAX & MIN ADJUSTED CORRECTLY - MAX & MIN

THE MAXIMUM AND/OR M

Next: !p1545, !f1546

VOLTAGE GAS VALVE MODULATION COIL - MAX

Next: !p1543, !f1544

OBSERVATION HEATING OUTPUT SETTING

CH TEMPERATURE CONTROL SET TO MAX
ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p1551, f1552

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: !p1557, !f1558

CH OUTPUT - ADJUSTED CORRECTLY

THE CH OUTPUT SETTIN

Next: !p1555, !f1556

RESISTANCE SWITCH AIR PRESSURE AND HARNESS

REMOVE CONNECTOR X16 FROM THE PCB

Next: p1576, f1570

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: !p1574, !f1575

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: p1577, !f1578

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: !p1579, !f1580

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: !p1588, !f1589

VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: !p1620, ?1596, ?1598

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: !p1600, !f1601

INSPECTION RESTRICTOR

GAIN ACCESS TO THE OUTLET OF THE FAN ASSEMBLY

Next: !p1622, !f1623

INSPECTION RESTRICTOR

GAIN ACCESS TO THE OUTLET OF THE FAN ASSEMBLY

Next: !p1625, !f1626

RESISTANCE OVERHEAT STAT - FLOW PIPE

REMOVE CONNECTORS FROM THE FLOW PIPE OVERHEAT STAT

Next: !p169, !f170

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X12 FROM THE PCB
REMOVE ELECTRICAL CONNECTIONS AT PUMP

Next: !p199, !f200

PRESSURE GAS VALVE - IGNITION

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p209, ?255, ?315

OBSERVATION BURNER

Next: p373, ?374, ?376

OBSERVATION ELECTRODE SPARK

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p211, f212

INSPECTION FLUEWAYS MAIN HEAT EXCHANGER

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p213, !f214

INSPECTION BURNER ASSEMBLY

Next: !p215, !f216

FAULT CODES

Next: !p28, !f29

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p260, !f261

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p1124, f263

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: p276, !f277

INSPECTION FAN ASSEMBLY

REMOVE FAN ASSEMBLY

Next: p270, !f271

INSPECTION FLUEWAYS MAIN HEAT EXCHANGER

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p822, !f273

RESISTANCE HARNESS AIR PRESSURE SWITCH

REMOVE LEADS FROM AIR PRESSURE SWITCH (MAKE A NOTE OF THEIR LOCATION)
REMOVE X16 FROM THE PCB

Next: !p278, !f279

PRESSURE GAS VALVE INLET

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p317, !f318

PRESSURE GAS VALVE - MINIMUM

REMOVE ONE LEAD FROM

Next: p319, !f343

POTENTIOMETER 4 - IGNITION CAPACITY

{GAINPCBACS}
ATTA

Next: p321, f322

RESISTANCE THERMISTOR FLOW AND HARNESS

REMOVE CONNECTOR X9 FROM THE PCB

Next: !p33, f34

PRESSURE GAS VALVE - IGNITION RATE - ADJUSTED CORRECTLY

THE BURNER PRESSURE

Next: !p327, !f328

INSPECTION DETECTION ELECTRODE

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p428, !f429

PRESSURE GAS VALVE - IGNITION

ATTACH PRESSURE GAUGE TO GAS VALVE PRESSURE OUTLET TEST POINT

Next: p411, f415

INSPECTION BURNER ASSEMBLY

Next: !p413, !f414

PRESSURE GAS VALVE - MINIMUM

REMOVE ONE LEAD FROM

Next: p418, !f419

POTENTIOMETER 4 - IGNITION CAPACITY

{GAINPCBACS}
ATTA

Next: p420, f421

PRESSURE GAS VALVE - IGNITION RATE - ADJUSTED CORRECTLY

THE BURNER PRESSURE

Next: !p426, !f427

VOLTAGE ELECTRODE DETECTION AT PCB

REMOVE CONNECTOR X2 (DETECTION ELECTRODE LEAD) FROM THE PCB
ENSURE NO DEMANDS ARE PRESENT

Next: p430, !f431

RESISTANCE ELECTRODE DETECTION

REMOVE CONNECTOR X2 (DETECTION ELECTRODE LEAD) FROM THE PCB

Next: !p432, !f433

PRESSURE GAS VALVE MAXIMUM & MINIMUM

DISCONNECT ONE LEAD

Next: p1139, f436

INSPECTION FLUEWAYS MAIN HEAT EXCHANGER

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p443, !f444

PRESSURE GAS VALVE - ADJUSTMENT MAX & MIN

DISCONNECT ONE LEAD

Next: p439, !f440

PRESSURE GAS VALVE - MAX & MIN ADJUSTED CORRECTLY

THE MAXIMUM AND/OR M

Next: !p441, !f442

INSPECTION GASKETS COMBUSTION

Next: p1621, ?447, ?449

RESISTANCE ELECTRODES AND LEADS

REMOVE SPARK ELECTRODE LEAD CONNECTIONS FROM THE PCB

Next: !p461, ?464, ?466

OBSERVATION DIVERTER VALVE ACTUATOR - DHW

REMOVE DIVERTER VALV

Next: !p476, f477

RESISTANCE THERMISTOR DHW AND HARNESS

REMOVE CONNECTOR X9 FROM PCB

Next: p478, !f1100

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: p1594, !f483

RESISTANCE HARNESS ACTUATOR

REMOVE ELECTRICAL CONNECTOR FROM THE DIVERTER VALVE ACTUATOR AND CONNECTOR X19 FROM THE PCB

Next: !p489, !f490

VOLTAGE MAINS POWER INPUT AT FUSES

{GAINPCBACS}

Next: p1020, f829

OBSERVATION SYSTEM PRESSURE

Next: p495, !f496

VOLTAGE DHW TEMPERATURE CONTROL - SPINDLE

GAIN ACCESS TO INTERFACE PCB (USE INSULATION MAT AS REQUIRED)

Next: p1463, ?1186, ?1188

DISCONNECT EXTERNAL CONTROLS

REMOVE WIRES / LINK FROM EXTERNAL CONTROLS TERMINAL CONNECTOR AND MAKE SAFE

Next: p54, !f55

OBSERVATION ISOLATE COLD FEED TO BOILER

ISOLATE DHW COLD FEED TO BOILER

Next: p83, !f75

OBSERVATION SYSTEM PRESSURE

Next: p566, !f567

PUMP LIMPET

Next: p568, !f569

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - DHW

DHW TEMPERATURE SET

Next: p1245, f571

OBSERVATION SYSTEM PRESSURE

Next: p669, !f670

INSPECTION EXPANSION VESSEL PRESSURE

DISCHARGE PRIMARY SYSTEM WATER

Next: !p667, !f668

OBSERVATION INTERNAL OR EXTERNAL CONTROLS FITTED

Next: p723, f724

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p686, !f672

PUMP LIMPET

Next: p673, !f674

OBSERVATION DIVERTER VALVE ACTUATOR - CH

REMOVE DIVERTER VALV

Next: p675, f676

INSPECTION DIVERTER VALVE SPINDLE

REMOVE DIVERTER VALVE ACTUATOR MOTOR

Next: p677, !f678

TEMPERATURE DIFFERENTIAL - INTERNAL BYPASS

ENSURE RADIATORS ARE

Next: p701, f702

RESISTANCE HARNESS ACTUATOR

REMOVE ELECTRICAL CONNECTOR FROM THE DIVERTER VALVE ACTUATOR AND CONNECTOR X19 FROM THE PCB

Next: !p681, !f682

INSPECTION EXTERNAL BYPASS

Next: p671, !f698

INSPECTION FILTER RETURN

DRAIN PRIMARY CIRCUIT
REMOVE SYSTEM FILTER FROM RETURN ISOLATION VALVE

Next: !p705, !f706

BYPASS EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROL WIRING, LEAVE IN A SAFE PLACE
LINK OUT EXTERNAL CONTROLS (WIRE LINK)

Next: !p757, f748

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p739, f740

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p741, !f742

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p751, f752

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p755, !f756

OBSERVATION INTERNAL OR EXTERNAL CONTROLS FITTED

Next: p759, f760

BYPASS EXTERNAL CONTROLS

DISCONNECT EXTERNAL CONTROL WIRING, LEAVE IN A SAFE PLACE
LINK OUT EXTERNAL CONTROLS (WIRE LINK)

Next: !p769, f770

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p763, f764

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p767, !f768

RESISTANCE TIMER PROGRAMMER AND HARNESS

ENSURE CH DEMAND IS SELECTED ON TIMER PROGRAMMER
REMOVE CONNECTOR X7 FROM THE PCB

Next: p773, f774

RESISTANCE EXTERNAL CONTROL HARNESS

REMOVE CONNECTOR X7 FROM THE PCB
ENSURE EXTERNAL CONTROLS (WIRE LINK) ARE STILL LINKED OUT

Next: !p777, !f778

INSPECTION RESTRICTOR

GAIN ACCESS TO THE OUTLET OF THE FAN ASSEMBLY

Next: p825, !f824

INSPECTION FLUE ASSEMBLY

Next: !p827, !f826

DISCONNECT FLOW SENSOR DHW

REMOVE ELECTRICAL CONNECTOR TO DHW FLOW SENSOR AND MAKE SAFE

Next: p84, !f85

RESISTANCE FUSES PCB

REMOVE BOTH FUSES FROM PCB

Next: !p842, f837

TEMPERATURE FLOW PIPE - FROST PROTECTION

ATTACH TEMPERATURE C

Next: p86, !f87

VOLTAGE DISPLAY AT PCB

ENSURE SELECTOR SWITCH IS SET TO DHW/CH POSITION.

Next: p845, f1038

RESISTANCE CABLE INTERFACE PCB

REMOVE RIBBON CABLE AT THE MAIN PCB

Next: p848, !f1014

OBSERVATION BOILER RESPONDS TO A DEMAND

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: !p850, ?852, ?854

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: !p88, !f89

RESET APPLIANCE FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p867, !f868

RESET APPLIANCE FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p874, !f875

RESISTANCE SWITCH WATER PRESSURE AND HARNESS

REMOVE CONNECTOR X16 FROM THE PCB

Next: p898, f899

RESET APPLIANCE FAULT CODE

ENSURE NO DEMANDS ARE PRESENT

Next: !p907, !f908

OBSERVATION COLD WATER SUPPLY

Next: p93, !f94

RESISTANCE FAN AND HARNESS

REMOVE CONNECTOR X12 FROM THE PCB

Next: !p921, f922

VOLTAGE SWITCH AIR PRESSURE (AIR PROVING)

{GAINPCBACS}
SET SELECTOR SWITCH TO THE OFF POSITION

Next: !p927, f928

INSPECTION AIR PRESSURE TUBE

REMOVE LEFT HAND SIDE PANEL

Next: p941, !f942

INSPECTION FLOW VALVE ASSEMBLY DHW

ISOLATE COLD FEED TO BOILER
DRAIN DHW CIRCUIT
DISASSEMBLE DHW FLOW MANIFOLD

Next: !p101, !f102

INSPECTION FAN ASSEMBLY

REMOVE FAN ASSEMBLY

Next: p933, !f934

INSPECTION FLUEWAYS MAIN HEAT EXCHANGER

GAIN ACCESS TO COMBUSTION CHAMBER

Next: p935, !f936

INSPECTION RESTRICTOR

GAIN ACCESS TO THE OUTLET OF THE FAN ASSEMBLY

Next: p937, !f938

INSPECTION FLUE ASSEMBLY

Next: !p939, !f940

RESISTANCE HARNESS AIR PRESSURE SWITCH

REMOVE LEADS FROM AIR PRESSURE SWITCH (MAKE A NOTE OF THEIR LOCATION)
REMOVE X16 FROM THE PCB

Next: !p943, !f944

OBSERVATION SYSTEM PRESSURE

Next: p954, !f955

OBSERVATION PUMP RUNS

Next: p956, f957

PUMP LIMPET

Next: p962, !f963

RESISTANCE HARNESS PUMP

REMOVE CONNECTOR X12 FROM THE PCB
REMOVE ELECTRICAL CONNECTIONS AT PUMP

Next: !p960, !f961

OBSERVATION PUMP OVERRUN

ENSURE NO DEMANDS ARE PRESENT

Next: p964, f983

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - DHW

DHW TEMPERATURE SET

Next: p966, f967

TEMPERATURE DIFFERENTIAL FLOW AND RETURN - CH

CH TEMPERATURE SET T

Next: p972, !f973

RUN BOILER TO MAX TEMP - DOES OVERHEAT OCCUR

ATTACH TEMPERATURE C

Next: !p974, ?976, ?978

RESISTANCE OVERHEAT STAT - HEAT EXCHANGER

REMOVE LEADS FROM HEAT EXCHANGER OVERHEAT STAT

Next: p993, !f994

RESISTANCE THERMISTOR FLOW

REMOVE LEFT HAND SIDE PANEL
REMOVE LEADS TO FLOW THERMISTOR

Next: p1343, !f981

RESISTANCE OVERHEAT STAT - FLOW PIPE

REMOVE CONNECTORS FROM THE FLOW PIPE OVERHEAT STAT

Next: !p995, !f996

RESET APPLIANCE - FAULT CODE OVERHEAT

ENSURE BOILER IS COOL AND NO DEMANDS ARE PRESENT

Next: !p999, !f1000

System Information

Total Tests: 651

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control