XSol Diagnostic System

VOKERA SABRE HE

GLOBALLY REPLACED

Next: &3, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &58, !f243

OBSERVATION STAND-BY MODE

SELECTOR SWITCH SET TO CH/DHW POSITION
ENSURE NO DEMANDS ARE PRESENT

Next: &212, ?61, ?163, ?237, ?5641

OBSERVATION DHW FLOW RATE

Next: &2739, f82

OBSERVATION DOES BURNER IGNITE AND ESTABLISH

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: &409, ?95, ?97, ?99, ?101, ?5294

OPERATION DHW

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: &4587, ?368, ?374, ?477, ?2670, ?2685

TYPE OF DIAGNOSTIC PROCEDURE

Next: &364, !f213

FUNCTIONAL SEQUENCE

NOT USED ANYMORE

Next: &81, !f365

PRESSURE GAS INLET

ATTACH PRESSURE GAUG

Next: &103, !f410

CH OPERATION

SELECTOR SWITCH SET

Next: &4626, ?454, ?456, ?3163

OBSERVATION PUMP OVER-RUN

SELECTOR SWITCH SET

Next: &nff, !f596

DHW MODULATION

SELECTOR SWITCH SET

Next: &1107, ?4994

JP2 LINK INFORMATION PAGE

Next: &nff, !f4779

OVERHEAT FURTHER INVESTIGATION

Next: &nff, f4065

FURTHER INVESTIGATION FUSE BLOWN

INTENTIONALLY BLANK

Next: &nff, f5025

TEMPORARY FAULT

INTENTIONALLY BLANK

Next: &nff, f5438

SARA FUNCTION INFORMATION PAGE

Next: &nff, !f4778

DHW THERMISTOR

INTENTIONALLY BLANK

Next: &nff, f1036

HEAT THERMISTOR/IGNITION LOCKOUT

INTENTIONALLY BLANK

Next: &nff, f3537

OBSERVATION DOES BOILER RESPOND TO A CH DEMAND

SELECTOR SWITCH SET

Next: &448, f3445

CH MODULATION

FOR TESTING PURPOSES

Next: &449, f1144

OBSERVATION FAN RUNNING DHW DEMAND

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX
GAIN ACCESS TO FAN

Next: &2982, ?4478

OBSERVATION PUMP RUNNING

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: &92, f4634

DHW BURNER PRESSURE MAX & MIN

SELECTOR SWITCH SET

Next: &809, f4588

OBSERVATION SYSTEM PRESSURE RISE

SELECTOR SWITCH SET

Next: &1143, f4631

CH MODULATION

HEAT THERMISTOR

Next: End

TYPE DIAGNOSTIC PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

DHW THERMISTOR

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

HEAT THERMISTOR

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

MAIN HEAT EXCHANGER

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

ELECTRODE SPARK GAP

Next: End

ENHANCED FAULT CODES 2

Z DIRECTION CHOICE OR CONTINUE

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

BURNER

Next: End

CO FUNCTION

PCB

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

LED DOES NOT ILLUMINATE

FUSE F3 (FUSED SPUR)

Next: End

LED DOES NOT ILLUMINATE

FUSE F2

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

PUMP

Next: End

DHW RUNS HOT THEN COLD

PUMP

Next: End

LED DOES NOT ILLUMINATE 1

PCB

Next: End

BURNER IGNITES BUT BAFFLES 1

MAIN HEAT EXCHANGER

Next: End

BURNER IGNITES BUT BAFFLES

BURNER

Next: End

BURNER IGNITES BUT BAFFLES

CONDENSATE TRAP OR PIPEWORK

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

DHW THERMISTOR

Next: End

DHW RUNS HOT THEN COLD

DHW THERMISTOR

Next: End

LED DOES NOT ILLUMINATE

FUSE F1

Next: End

UNABLE TO SET UP MAX MIN BURNER PRESSURES 3

GAS VALVE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

GAS VALVE - ADJUSTMENT

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

GAS INLET PRESSURE

Next: End

BOILER NOISY (KETTLING)

SYSTEM PRESSURE AND AIR

Next: End

BURNER IGNITES BUT BAFFLES 1

LATENT HEAT COLLECTOR

Next: End

BOILER TEMPERATURE LOW SYSTEM TEMPERATURE LOW

TEMPERATURE CONTROL KNOB

Next: End

BOILER TEMPERATURE LOW SYSTEM TEMPERATURE LOW

HEAT THERMISTOR

Next: End

DHW FLOW RATE

ISOLATION VALVE HW

Next: End

DHW FLOW RATE

COLD WATER SUPPLY

Next: End

DHW RUNS HOT THEN COLD 1

INTERNAL BY-PASS

Next: End

DHW RUNS HOT THEN COLD

DHW NON-RETURN VALVE

Next: End

DHW RUNS HOT THEN COLD

LATENT HEAT COLLECTOR

Next: End

DHW RUNS HOT THEN COLD

INTERNAL BY-PASS

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND 1

INTERNAL BY-PASS

Next: End

DHW TOO COOL RADIATORS COOL WITH NO DEMAND

DHW NON-RETURN VALVE

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

LATENT HEAT COLLECTOR

Next: End

DHW TOO COOL RADIATORS COOL WITH NO DEMAND

INTERNAL BY-PASS

Next: End

HEAT THERMISTOR FAULT CODE

HEAT THERMISTOR

Next: End

FUNCTIONAL SEQUENCE

Z DIRECTION CHOICE OR CONTINUE

Next: End

UNABLE TO SET UP MAX MIN BURNER PRESSURES 4

GAS VALVE

Next: End

BURNER IGNITES BUT BAFFLES

GAS VALVE - ADJUSTMENT

Next: End

BURNER IGNITES BUT BAFFLES

GAS INLET PRESSURE

Next: End

OVERHEAT

HIGH LIMIT THERMOSTAT

Next: End

OVERHEAT

SYSTEM PRESSURE AND AIR

Next: End

OVERHEAT

HEAT THERMISTOR

Next: End

GAS INLET PRESSURE MEASUREMENT

GAS INLET PRESSURE

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

GAS INLET PRESSURE

Next: End

DHW TOO HOT

DHW THERMISTOR

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

GAS VALVE AND PCB

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

PCB

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER MANIFOLD

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

CONDENSATE TRAP OR PIPEWORK

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

FAN DOES NOT RUN

SYSTEM PRESSURE

Next: End

FAN DOES NOT RUN

DHW FLOW SWITCH

Next: End

FAN DOES NOT RUN

AIR PRESSURE SWITCH

Next: End

FAN DOES NOT RUN

LOW WATER PRESSURE SWITCH

Next: End

FAN DOES NOT RUN

SIPHON

Next: End

FAN DOES NOT RUN

DHW THERMISTOR

Next: End

FAN DOES NOT RUN

HEAT THERMISTOR

Next: End

FAN DOES NOT RUN

HIGH LIMIT THERMOSTAT

Next: End

FAN DOES NOT RUN

HARNESS-FAN

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

SYSTEM PRESSURE

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

DHW FLOW SWITCH

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

AIR PRESSURE SWITCH

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

LOW WATER PRESSURE SWITCH

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

SIPHON

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

HARNESS-FAN

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

HEAT THERMISTOR

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

HIGH LIMIT THERMOSTAT

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

GAS VALVE

Next: End

DHW BURNER PRESSURE MAX & MIN

GAS VALVE - ADJUSTMENT

Next: End

UNABLE TO SET UP MAX MIN BURNER PRESSURES 6

GAS VALVE

Next: End

DHW BURNER PRESSURE MAX MIN 2

GAS VALVE - ADJUSTMENT

Next: End

DHW BURNER PRESSURE MAX MIN 1

GAS VALVE - ADJUSTMENT

Next: End

EXCESSIVE SYSTEM PRESSURE

EXPANSION VESSEL

Next: End

PUMP DOES NOT RUN

PCB

Next: End

PUMP DOES NOT RUN

HARNESS

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

FLOW AND RETURN ISOLATION VALVES

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

PCB

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

HARNESS

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

DIVERTER VALVE CARTRIDGE

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

INTERNAL BY-PASS

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

DHW NON-RETURN VALVE

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

PUMP

Next: End

PUMP DOES NOT RUN 1

PCB

Next: End

PUMP DOES NOT RUN 1

HARNESS

Next: End

OVERHEAT

DHW THERMISTOR

Next: End

OVERHEAT

PUMP

Next: End

DHW TOO COOL RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

PCB

Next: End

DHW TOO COOL RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

HARNESS

Next: End

BURNER IGNITES BUT BAFFLES

CONDENSATE PIPEWORK

Next: End

SARA FUNCTION INFO PAGE

Z DIRECTION CHOICE OR CONTINUE

Next: End

JP2 LINK INFO PAGE

Z DIRECTION CHOICE OR CONTINUE

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

GAS VALVE MODULATING SOLENOID

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

BURNER MANIFOLD

Next: End

BOILER NOISY (KETTLING)

PUMP

Next: End

BOILER FIRES WITH NO DEMAND 1

DHW FLOW SWITCH

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 1

HEAT THERMISTOR

Next: End

BOILER FIRES WITH NO DEMAND

DHW SYSTEM

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

GAS VALVE MODULATING SOLENOID

Next: End

MAX VOLTAGE TO MODUREG

PCB

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND 1

GAS VALVE MODULATING SOLENOID

Next: End

MAX VOLTAGE TO MODUREG 1

PCB

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 1

DHW THERMISTOR

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

TEMPERATURE CONTROL KNOB

Next: End

PUMP DOES NOT RUN CH DEMAND 4

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 6

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 8

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 1

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 2

INTERNAL CLOCK

Next: End

BURNER IGNITES BUT BAFFLES

FAN SEAL

Next: End

BURNER IGNITES BUT BAFFLES

FLUE

Next: End

DHW MODULATION

DHW THERMISTOR

Next: End

BOILER FIRES WITH NO DEMAND 1

DHW SYSTEM

Next: End

BOILER FIRES WITH NO DEMAND

DHW FLOW SWITCH

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY

DHW THERMISTOR

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY

HEAT THERMISTOR

Next: End

FUSE BLOWN

DIVERTER VALVE ACTUATOR

Next: End

FUSE FURTHER INVESTIGATIONDIVERTER VALVE COMPONENTS

DIVERTER VALVE

Next: End

FUSE BLOWN

PUMP

Next: End

FUSE BLOWN

FAN

Next: End

FUSE BLOWN

GAS VALVE

Next: End

FUSE BLOWN

GAS VALVE MODULATING SOLENOID

Next: End

PUMP DOES NOT RUN CH DEMAND

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 3

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 5

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 7

INTERNAL CLOCK

Next: End

PUMP DOES NOT RUN CH DEMAND 9

INTERNAL CLOCK

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 2

ELECTRODE AND HARNESS

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH1

ELECTRODE SPARK GAP

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

ELECTRODE AND HARNESS

Next: End

PUMP OVER-RUN 1

PCB

Next: End

OVERHEAT

Next: End

OVERHEAT

INTERNAL BY-PASS

Next: End

OVERHEAT

LATENT HEAT COLLECTOR

Next: End

OVERHEAT

DHW NON-RETURN VALVE

Next: End

BURNER DROPS OUT

AIR PRESSURE SWITCH TUBES

Next: End

BURNER DROPS OUT

AIR PRESSURE SWITCH

Next: End

BURNER DROPS OUT

CONDENSATE TRAP OR PIPEWORK

Next: End

BURNER DROPS OUT

MAIN HEAT EXCHANGER

Next: End

BURNER DROPS OUT

LATENT HEAT COLLECTOR

Next: End

BURNER DROPS OUT

FLUE

Next: End

BURNER DROPPING OUT

PCB

Next: End

TEMPORARY FAULT

SYSTEM PRESSURE

Next: End

TEMPORARY FAULT

LOW WATER PRESSURE SWITCH TEMPORARY FAULT

Next: End

TEMPORARY FAULT

CONDENSE PRESSURE SWITCH TEMPORARY FAULT

Next: End

DHW RUNS HOT COLD

HEAT THERMISTOR

Next: End

DHW COOL RADS COOL

HEAT THERMISTOR

Next: End

SPARKING DOES NOT OCCUR

IGNITION PCB NOT FITTED

Next: End

SPARKING DOES NOT OCCUR

IGNITION PCB

Next: End

SPARKING DOES NOT OCCUR 1

PCB

Next: End

SPARKING DOES NOT OCCUR 1

IGNITION PCB

Next: End

SPARKING DOES NOT OCCUR

ELECTRODE SPARK GAP

Next: End

SPARKING DOES NOT OCCUR 1

ELECTRODE AND HARNESS

Next: End

SPARKING DOES NOT OCCUR 2

PCB

Next: End

SPARKING DOES NOT OCCUR 1

FAN VENTURI

Next: End

SPARKING DOES NOT OCCUR 1

AIR PRESSURE SWITCH TUBES

Next: End

SPARKING DOES NOT OCCUR 1

AIR PRESSURE SWITCH

Next: End

SPARKING DOES NOT OCCUR

CONDENSATE TRAP OR PIPEWORK

Next: End

SPARKING DOES NOT OCCUR 1

MAIN HEAT EXCHANGER

Next: End

SPARKING DOES NOT OCCUR 1

LATENT HEAT COLLECTOR

Next: End

SPARKING DOES NOT OCCUR 1

FLUE

Next: End

SPARKING DOES NOT OCCUR

HARNESS

Next: End

SOLID RED LOCKOUT

SYSTEM PRESSURE

Next: End

SOLID RED LOCKOUT

LOW WATER PRESSURE SWITCH TEMPORARY FAULT

Next: End

SOLID RED LOCKOUT

CONDENSE PRESSURE SWITCH TEMPORARY FAULT

Next: End

PUMP RUNNING CONTINUOUSLY

HEAT THERMISTOR

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 1

HARNESS

Next: End

DHW THERMISTOR FAULT CODE

HARNESS

Next: End

TEMPORARY FAULT

HIGH LIMIT THERMOSTAT

Next: End

PUMP OVER-RUN

PCB

Next: End

CH NOISY OPERATION

FLOW AND RETURN ISOLATION VALVES

Next: End

CH NOISY OPERATION

PUMP

Next: End

CH NOISY OPERATION

HEAT THERMISTOR

Next: End

CH NOISY OPERATION

INTERNAL BY-PASS

Next: End

CH NOISY OPERATION

SYSTEM PRESSURE

Next: End

DHW FLOW RATE

DHW FLOW LIMITER

Next: End

DHW FLOW RATE

DHW FLOW SWITCH

Next: End

DHW THERMISTOR FAULT CODE

PCB

Next: End

CH MODULATION

PCB

Next: End

CO FUNCTION RESET

Z DIRECTION CHOICE OR CONTINUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 3

IGNITION PCB

Next: End

ENHANCED FAULT CODES 1

Z DIRECTION CHOICE OR CONTINUE

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

BURNER MANIFOLD

Next: End

LED DOES NOT ILLUMINATE

Next: End

FURTHER INVESTIGATION F3

Z DIRECTION CHOICE OR CONTINUE

Next: End

LED DOES NOT ILLUMINATE

HARNESS-WIRING

Next: End

FURTHER INVESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FURTHER INVESTIGATION LED PROBLEM

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY

INTERNAL CLOCK

Next: End

LED DOES NOT ILLUMINATE

Z DIRECTION CHOICE OR CONTINUE

Next: End

ANTI-FROST PROTECTION

ANTI-FROST PROTECTION ACTIVATED

Next: End

DHW BURNER PRESSURE MAX MIN 3

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER TEMPERATURE LOW SYSTEM TEMPERATURE LOW

PCB

Next: End

DHW RUNS HOT THEN COLD

PCB

Next: End

DHW RUNS HOT THEN COLD

DHW HEAT EXCHANGER

Next: End

DHW RUNS HOT THEN COLD

MAIN HEAT EXCHANGER

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

PCB

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

DHW HEAT EXCHANGER

Next: End

DHW TOO COOL RADIATORS COOL WITH NO DEMAND

MAIN HEAT EXCHANGER

Next: End

HEAT THERMISTOR FAULT CODE

HARNESS

Next: End

DHW BURNER PRESSURE MAX MIN 4

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT 1

PCB

Next: End

OVERHEAT 2

HARNESS

Next: End

DHW TOO HOT

PCB

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

HARNESS

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

HARNESS-GAS VALVE & IGNITION PCB

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 2

GAS VALVE

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 1

IGNITION PCB

Next: End

FAN DOES NOT RUN

HARNESS

Next: End

FAN DOES NOT RUN 2

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 6

HARNESS

Next: End

FAN DOES NOT RUN

CONDENSE PRESSURE SWITCH

Next: End

FAN DOES NOT RUN

PCB

Next: End

FAN DOES NOT RUN 4

HARNESS

Next: End

FAN DOES NOT RUN

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN DOES NOT RUN

FAN

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 4

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 2

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 5

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILUMINATED

CONDENSE PRESSURE SWITCH

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

FAN

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED 3

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

Z DIRECTION CHOICE OR CONTINUE

Next: End

LED DOES NOT ILLUMINATE

PCB

Next: End

SPARKING OCCURS BUT BURNER DOES NOT IGNITE 3

HARNESS

Next: End

DHW BURNER PRESSURE MAX & MIN

Z DIRECTION CHOICE OR CONTINUE

Next: End

DHW BURNER PRESSURE MAX MIN 6

Z DIRECTION CHOICE OR CONTINUE

Next: End

DHW BURNER PRESSURE MAX MIN 5

Z DIRECTION CHOICE OR CONTINUE

Next: End

EXCESSIVE SYSTEM PRESSURE

EXPANSION VESSEL PIPE

Next: End

PUMP DOES NOT RUN

PUMP

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

DIVERTER VALVE ACTUATOR

Next: End

BOILER REACHES TEMPERATURE RADIATORS COLD

Next: End

PUMP DOES NOT RUN 1

PUMP

Next: End

OVERHEAT 2

PCB

Next: End

OVERHEAT 1

HIGH LIMIT THERMOSTAT

Next: End

OVERHEAT

NORMAL OPERATION

Next: End

DHW TOO COOL RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

DIVERTER VALVE CARTRIDGE

Next: End

DHW TOO COOL RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

DIVERTER VALVE ACTUATOR

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 2

HARNESS

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 2

PCB

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 3

HARNESS

Next: End

UNABLE TO SET UP MINIMUM

GAS VALVE

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND

HARNESS

Next: End

FAULTY MAX ADJUSTMENT

GAS VALVE

Next: End

UNABLE TO SET UP MINIMUM 1

GAS VALVE

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND 1

HARNESS

Next: End

FAULTY MAX ADJUSTMENT 1

GAS VALVE

Next: End

PUMP DOES NOT RUN CH DEMAND 2

Next: End

PUMP DOES NOT RUN CH DEMAND 6

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 5

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 3

Next: End

PUMP DOES NOT RUN CH DEMAND 8

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 6

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 4

Next: End

PUMP DOES NOT RUN CH DEMAND 10

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 7

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND

Next: End

PUMP DOES NOT RUN CH DEMAND 2

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 8

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 1

Next: End

PUMP DOES NOT RUN CH DEMAND 3

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 9

HARNESS

Next: End

BURNER IGNITES BUT BAFFLES 1

LATENT HEAT COLLECTOR SEAL

Next: End

DHW MODULATION

PCB

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 1

HARNESS

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY 1

PCB

Next: End

BOILER FIRES WITH NO DEMAND OR PUMP RUNNING CONTINUOUSLY

HARNESS

Next: End

FUSE BLOWN 1

HARNESS

Next: End

FUSE BLOWN 4

HARNESS

Next: End

FUSE BLOWN

HARNESS-FAN

Next: End

FUSE BLOWN 3

HARNESS

Next: End

FUSE BLOWN

HARNESS

Next: End

FURTHER INVESTIGATION FUSE BLOWN

PCB (FUSE BLOWN)

Next: End

PUMP DOES NOT RUN CH DEMAND 1

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 4

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 1

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 5

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 2

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 7

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 3

HARNESS

Next: End

PUMP DOES NOT RUN CH DEMAND 9

PCB

Next: End

PUMP DOES NOT RUN CH DEMAND 4

HARNESS

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

IGNITION PCB

Next: End

BURNER IGNITES BUT DOES NOT ESTBALISH 4

PCB

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH 1

IGNITION TRANSFORMER

Next: End

OVERHEAT

DHW HEAT EXCHANGER

Next: End

OVERHEAT

MAIN HEAT EXCHANGER

Next: End

HEAT THERMISTOR/IGNITION LOCKOUT

Z DIRECTION CHOICE OR CONTINUE

Next: End

TEMPORARY FAULT

HARNESS

Next: End

SPARKING DOES NOT OCCUR

PCB

Next: End

SPARKING DOES NOT OCCUR

IGNITION TRANSFORMER

Next: End

SPARKING DOES NOT OCCUR 1

FAN

Next: End

SPARKING DOES NOT OCCUR 3

PCB

Next: End

BURNER DROPS OUT

IGNITION PCB

Next: End

SOLID RED LOCKOUT

PCB

Next: End

SOLID RED LOCKOUT - CONDENSE SWITCH / LWPS

HARNESS

Next: End

BURNER DROPS OUT

FAN VENTURI

Next: End

BURNER DROPS OUT

FAN

Next: End

PUMP RUNNING CONTINUOUSLY

PCB

Next: End

PUMP RUNNING CONTINUOUSLY

HARNESS

Next: End

FAN DOES NOT RUN LED NOT ILLUMINATED

DHW THERMISTOR

Next: End

DHW THERMISTOR FAULT CODE

DHW THERMISTOR

Next: End

TEMPORARY FAULT

PCB

Next: End

TEMP FAULT

HARNESS

Next: End

BOILER NOISY (KETTLING)

MAIN HEAT EXCHANGER

Next: End

CH NOISY OPERATION

Next: End

DHW FLOW RATE

DHW HEAT EXCHANGER

Next: End

NOISY OPERATION

PCB

Next: End

BOILER NOISY (KETTLING)

DHW HEAT EXCHANGER

Next: End

CH NOISY OPERATION

MAIN HEAT EXCHANGER

Next: End

BURNER IGNITES BUT BAFFLES

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p102

LED DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM OBSERVATION STAND-BY MODE

Next: p254

FAULT CODE LED DISPLAYED

CHARACTERISTIC TEST FROM OBSERVATION STAND-BY MODE

Next: p239

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2967

DHW TOO COOL, RADIATORS COOL WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p4862

BOILER TEMPERATURE LOW SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3215

BOILER DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION CH OPERATION FOR NOISE

Next: p3477

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: p3495

BOILER DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION CH OPERATION FOR NOISE

Next: p3509

TEMPERATURE DIFFERENTIAL STILL EXCESSIVE

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: p3522

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p369

DHW TOO COOL, RADIATORS BEGIN TO HEAT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p375

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION FAN RUNNING DHW DEMAND

Next: p4480

BOILER REACHES TEMPERATURE RADIATORS COLD

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3194

NOISY OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p457

BOILER OVERHEATS BEFORE 85°C IS REACHED

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p4696

BOILER REACHES TEMPERATURE AND SHUTS DOWN CORRECTLY

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p4698

BOILER DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION CH OPERATION FOR NOISE

Next: p4700

BOILER NOISY (KETTLING)

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p478

UNABLE TO SET MINIMUM

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: !p4829

UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: p4831

UNABLE TO SET MINIMUM

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: !p4842

UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: p4844

BURNER PRESSURE DOES NOT REDUCE

CHARACTERISTIC TEST FROM DHW MODULATION

Next: p4995

VOLTAGE STAYS AT 100 VOLTS AC ON TEST 2

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION

Next: p5128

NO VOLTAGE PRESENT ON TEST 1

CHARACTERISTIC TEST FROM VOLTAGE RECTIFICATION

Next: p5125

BURNER IGNITES AND ESTABLISHES BUT DROPS OUT, ATTEMPS REIGNITION STRAIGHTAWAY

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p5370

VENTURIS UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: !p5638

FAN UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURIS

Next: !p5640

PUMP RUNNING CONTINUOUSLY

CHARACTERISTIC TEST FROM OBSERVATION STAND-BY MODE

Next: p5642

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION STAND-BY MODE

Next: p62

BOILER STILL NOISY

CHARACTERISTIC TEST FROM OBSERVATION CH OPERATION FOR NOISE

Next: !p690

TEMPERATURE DIFFERENTIAL CORRECT SYSTEM NOISE

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: !p760

BOILER DOES NOT RESPOND TO A CH DEMAND

CHARACTERISTIC TEST FROM OBSERVATION CH OPERATION FOR NOISE

Next: p2728

TEMPERATURE DIFFERENTIAL CORRECT NOISE DUE TO EXCESSIVE HEAT

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

Next: !p945

SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p5540

SPARKING OCCURS BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p98

BURNER IGNITES BUT DOES NOT ESTABLISH (SPARKING CONTINUES UNTIL LOCKOUT)

CHARACTERISTIC TEST FROM OBSERVATION DOES BURNER IGNITE AND ESTABLISH

Next: p100

29/03/2022 12:10:47 2203_1_50_1 26/08/2022 09:13:58

06/06/2022 13:07:33

Next: End

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: !p1037, f5650

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p1145, !f1146

VOLTAGE MAINS POWER INPUT TO APPLIANCE AT TERMINAL BLOCK

REMOVE CONTROL BOX COVER TO EXPOSE TERMINAL BLOCK

Next: p257, f258

RESISTANCE FUSE F3 (FUSED SPUR)

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p259, f260

FUSE FURTHER INVESTIGATION F3 (FUSED SPUR)

Next: !p261, !f262

FUSE FURTHER INVESTIGATION F2

Next: !p265, !f266

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p5108, f5109

DISCONNECT INTERNAL CLOCK

DISCONNECT THE WIRES AS INDICATED BY THE RED ARROWS AND MAKE SAFE

Next: !p2794, f4797

RESISTANCE FUSE F1

REMOVE THE FUSE FROM THE PCB

Next: p4529, f300

FUSE FURTHER INVESTIGATION F1

Next: !p301, !f302

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p2782, f2792

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p3446, f3447

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p5098, f5099

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

SELECTOR SWITCH SET

Next: !p3471, ?3476, ?3488

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p5113, f5114

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

SELECTOR SWITCH SET

Next: !p3507, ?3508, ?3520

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p5118, f5119

RESET BOILER

Next: !p5388, f3539

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p5627, f3541

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p3542, !f3543

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p3899, !f3900

HIGH LIMIT THERMOSTAT AND BOILER RESET

ENSURE APPLIANCE IS

Next: p4066, f4067

RESISTANCE HIGH LIMIT THERMOSTAT AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p4068, f4069

RESISTANCE HIGH LIMIT THERMOSTAT

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE THE LEADS FROM THE HIGH LIMIT THERMOSTAT

Next: !p4070, !f4071

PRESSURE GAS INLET

ATTACH PRESSURE GAUG

Next: p4104, !f4105

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR CN5 FROM THE PCB

Next: !p4403, f4256

RESISTANCE GAS VALVE MAIN SOLENOID

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p4286, !f4287

RESISTANCE GAS VALVE MODULATING SOLENOID

REMOVE THE LEADS FROM THE GAS VALVE MODULATING SOLENOID

Next: !p4271, !f4783

RESISTANCE GAS VALVE MAIN SOLENOID

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p4585, !f4586

OBSERVATION SYSTEM PRESSURE

Next: p4483, !f4484

DHW FLOW SWITCH RESISTANCE

REMOVE BOTH LEADS FROM THE DHW FLOW SWITCH

Next: !p4487, !f4488

RESISTANCE AIR PRESSURE SWITCH (REST POSITION)

REMOVE THE LEADS FROM THE AIR PRESSURE SWITCH MAKING A NOTE OF THEIR POSITIONS

Next: !p4491, !f4492

RESISTANCE LOW WATER PRESSURE SWITCH

REMOVE THE LEADS FROM THE LOW WATER PRESSURE SWITCH

Next: p4495, !f4496

INSPECTION SIPHON AND PIPEWORK

Next: !p4499, !f4500

RESISTANCE HIGH LIMIT THERMOSTAT

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE THE LEADS FROM THE HIGH LIMIT THERMOSTAT

Next: !p4507, f4508

OVERHEAT FURTHER INVESTIGATION

Next: !p4509, !f4510

OBSERVATION SYSTEM PRESSURE

Next: p4532, !f4533

DHW FLOW SWITCH RESISTANCE

REMOVE BOTH LEADS FROM THE DHW FLOW SWITCH

Next: !p4536, !f4537

RESISTANCE AIR PRESSURE SWITCH (REST POSITION)

REMOVE THE LEADS FROM THE AIR PRESSURE SWITCH MAKING A NOTE OF THEIR POSITIONS

Next: !p4540, !f4541

RESISTANCE LOW WATER PRESSURE SWITCH

REMOVE THE LEADS FROM THE LOW WATER PRESSURE SWITCH

Next: p4544, !f4545

INSPECTION SIPHON AND PIPEWORK

Next: !p4548, !f4549

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p4567, !f4568

RESISTANCE HIGH LIMIT THERMOSTAT

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE THE LEADS FROM THE HIGH LIMIT THERMOSTAT

Next: !p4570, f4571

OVERHEAT FURTHER INVESTIGATION

Next: !p4572, !f4573

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p4589, ?4841, ?4843

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p4599, !f4600

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p4608, ?4828, ?4830

INSPECTION EXPANSION VESSEL PRESSURE

Next: !p4632, !f4633

VOLTAGE PUMP AT PCB

{USEINSMAT}
GAIN

Next: p4635, !f4636

VOLTAGE TO DIVERTER VALVE ACTUATOR (CH DEMAND)

{USEINSMAT}
GAIN

Next: p4670, !f4671

VOLTAGE PUMP AT PCB

{USEINSMAT}
GAIN

Next: p4683, !f4684

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p5103, f5104

VOLTAGE TO DIVERTER VALVE ACTUATOR (DHW DEMAND)

{USEINSMAT}
GAIN

Next: p472, !f473

ISOLATE COLD MAINS SUPPLY

Next: p4798, !f4811

RESISTANCE DHW FLOW SWITCH

REMOVE BOTH OF THE LEADS FROM THE DHW FLOW SWITCH

Next: !p4801, !f4802

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p4809, !f4810

RESISTANCE GAS VALVE MODULATING SOLENOID

REMOVE THE LEADS FROM THE GAS VALVE MODULATING SOLENOID

Next: !p4834, !f4835

RESISTANCE GAS VALVE MODULATING SOLENOID

REMOVE THE LEADS FROM THE GAS VALVE MODULATING SOLENOID

Next: !p4847, !f4848

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p4935, f4936

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p4937, !f4938

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p4944, f4945

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p4946, !f4947

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p4953, f4954

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p4955, !f4956

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p4962, f4963

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p4964, !f4965

RESISTANCE CLOCK INTERNAL AT CONNECTOR CN1

SELECTOR SWITCH SET

Next: !p4971, f4972

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p4973, !f4974

ISOLATE COLD MAINS SUPPLY

Next: p5013, !f5014

RESISTANCE DHW FLOW SWITCH

REMOVE BOTH OF THE LEADS FROM THE DHW FLOW SWITCH

Next: !p5017, !f5018

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p5023, !f5024

INSPECTION DIVERTER VALVE ACTUATOR - FUSE FURTHER INVESTIGATION

DISCONNECT THE ELECT

Next: p5048, !f5057

RESISTANCE DIVERTER ACTUATOR FOR FUSE INVESTIGATION

REMOVE ELECTRICAL CO

Next: !p5051, !f5052

RESISTANCE PUMP FOR FUSE INVESTIGATION

REMOVE PUMP COVER AND DISCONNECT ELECTRICAL CONNECTIONS

Next: !p5081, !f5082

RESISTANCE FAN FOR FUSE INVESTIGATION

REMOVE THE ELECTRICAL CONNECTIONS FROM THE FAN

Next: !p5085, !f5086

RESISTANCE GAS VALVE MAIN SOLENOID FOR FUSE INVESTIGATION

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p5091, !f5092

RESISTANCE GAS VALVE MODULATING SOLENOID FOR FUSE INVESTIGATION

REMOVE THE LEADS FROM THE GAS VALVE MODULATING SOLENOID

Next: !p5094, !f5095

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p5100, !f5101

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p5105, !f5106

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p5110, !f5111

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p5115, !f5116

RESISTANCE CLOCK INTERNAL

GAIN ACCESS TO INTERNAL CLOCK
DISCONNECT THE TWO LEADS FROM THE MICROSWITCH
CLOCK SWITCHED ON

Next: !p5120, !f5121

INSPECTION SPARK GAP

GAIN ACCESS TO THE ELECTRODE

Next: p5131, !f5132

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

SELECTOR SWITCH SET

Next: !p5283, f5287

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: p5288, !f5289

OBSERVATION SYSTEM PRESSURE

Next: p5439, !f5440

RESISTANCE LOW WATER PRESSURE SWITCH

REMOVE THE LEADS FROM THE LOW WATER PRESSURE SWITCH

Next: p5443, !f5444

RESISTANCE BETWEEN IGNITION PCB CONNECTING PINS

REMOVE THE IGNITION PCB

Next: !p5545, !f5546

VOLTAGE AT FAN (CONSTANT)

SELECTOR SWITCH SET

Next: p5571, !f5550

VOLTAGE AT PCB - APS

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: p5590, !f5589

RESISTANCE LOW WATER PRESSURE SWITCH

REMOVE THE LEADS FROM THE LOW WATER PRESSURE SWITCH

Next: p5632, !f5633

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p5645, !f5646

RESISTANCE HARNESS DHW THERMISTOR

REMOVE CONNECTOR CN9 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DHW THERMISTOR

Next: !p5648, !f5649

RESISTANCE HARNESS DHW THERMISTOR

REMOVE CONNECTOR CN9 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DHW THERMISTOR

Next: !p5651, !f5652

RESISTANCE HIGH LIMIT THERMOSTAT

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE THE LEADS FROM THE HIGH LIMIT THERMOSTAT

Next: !p5656, !f5657

ANTI-FROST PROTECTION (BELOW 5 DEGREES)

REMOVE RIGHT HAND SIDE PANEL
CONNECT A TEMPERATURE PROBE/CLAMP TO FLOW PIPE

Next: !p310, f311

INSPECTION ISOLATION VALVE HW

Next: p3263, !f3269

PRESSURE GAS INLET

ATTACH PRESSURE GAUG

Next: p3121, !f3126

INSPECTION CONDENSATE PIPE

Next: p4295, !f4341

INSPECTION MAIN HEAT EXCHANGER

GAIN ACCESS TO MAIN HEAT EXCHANGER

Next: p1002, !f2407

OBSERVATION SPARK GAP

BOILER DHW THERMOSTAT SET TO MAX
GAIN ACCESS TO THE ELECTRODE

Next: p1004, !f2408

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: !p2409, !f2410

PRESSURE GAS INLET

ATTACH PRESSURE GAUG

Next: p3880, !f3904

FURTHER INVESTIGATION LED PROBLEM

Next: !p2778, !f2779

FAULT CODES

Next: !p240, !f241

VOLTAGE MAINS INPUT TO APPLIANCE

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p280, f256

RESISTANCE FUSE F2

REMOVE THE FUSE FROM TERMINAL BLOCK CONNECTOR

Next: !p263, f264

PUMP LIMPET TEST

Next: p2688, !f2705

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

SELECTOR SWITCH SET

Next: p4593, f3470

PUMP LIMPET TEST

Next: p2691, !f2692

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

SELECTOR SWITCH SET

Next: p4603, f3506

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p2729, f2730

BYPASS EXTERNAL CONTROLS

SELECTOR SWITCH SET

Next: !p4930, f4934

DISCONNECT EXTERNAL CONTROLS

DISCONNECT THE WIRES AS INDICATED BY THE RED ARROWS AND MAKE SAFE

Next: !p5011, f5012

OBSERVATION DOES FAN RUN DHW DEMAND

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX
GAIN ACCESS TO FAN

Next: p1186, f298

INSPECTION MAIN HEAT EXCHANGER

GAIN ACCESS TO MAIN HEAT EXCHANGER

Next: p2927, !f2928

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p2929, !f2930

INSPECTION LATENT HEAT COLLECTOR

GAIN ACCESS TO THE L

Next: p2931, !f3157

INSPECTION FAN SEAL

GAIN ACCESS TO THE FAN ASSEMBLY

Next: p4982, !f4983

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p5491, !f2966

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p5453, !f2981

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p3122, !f3123

CORRECT ADJUSTMENT OF MAX & MIN BURNER PRESSURES

Next: !p3124, !f3125

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p4665, !f4666

INSPECTION CH TEMPERATURE CONTROL SPINDLE

GAIN ACCESS TO PCB

Next: p3216, !f3217

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: !p3218, !f3219

OBSERVATION COLD WATER SUPPLY PRESSURE

Next: p83, !f3270

BYPASS EXTERNAL CONTROLS

SELECTOR SWITCH SET

Next: !p4960, f4961

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: !p3468, !f3469

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p3478, f3479

BYPASS EXTERNAL CONTROLS

SELECTOR SWITCH SET

Next: !p4942, f4943

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: p3496, !f3501

INSPECTION NON-RETURN VALVE

ISOLATE FLOW AND RET

Next: p3497, !f3498

INSPECTION LATENT HEAT COLLECTOR INLET AND OUTLET

ISOLATE FLOW AND RET

Next: !p3499, !f3500

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: !p3504, !f3505

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p3510, f3511

BYPASS EXTERNAL CONTROLS

SELECTOR SWITCH SET

Next: !p4951, f4952

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: p3523, !f3528

INSPECTION NON-RETURN VALVE

ISOLATE FLOW AND RET

Next: p3524, !f3525

INSPECTION LATENT HEAT COLLECTOR INLET AND OUTLET

ISOLATE FLOW AND RET

Next: !p3526, !f3527

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: !p416, !f417

OBSERVATION DIVERTER VALVE ACTUATOR SPINDLE DHW POSITION

SELECTOR SWITCH SET

Next: !p470, f471

DHW BURNER PRESSURE MAX & MIN

SELECTOR SWITCH SET

Next: p4761, f3898

CORRECT ADJUSTMENT OF MAX & MIN BURNER PRESSURES

Next: !p3901, !f3902

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p4072, !f4073

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: p4074, !f4075

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4681, !f4687

VOLTAGE GAS VALVE AT PCB

{USEINSMAT}
GAIN

Next: p4247, f4254

RESISTANCE MODULATING SOLENOID AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4261, f4268

VOLTAGE AT GAS VALVE MODULATING SOLENOID

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: p4278, !f4292

RESISTANCE GAS VALVE AND HARNESS

REMOVE CONNECTOR CN5 FROM THE PCB

Next: !p4291, f4288

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p4318, !f4342

INSPECTION BURNER MANIFOLD

REMOVE BURNER ASSEMBLY AND BURNER MANIFOLD

Next: p984, !f4340

VOLTAGE FAN AT PCB

{USEINSMAT}
GAIN

Next: p4481, f4482

VOLTAGE AT FAN

SELECTOR SWITCH SET

Next: !p4511, !f4512

DHW FLOW SWITCH AND HARNESS RESISTANCE

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4485, f4486

RESISTANCE AIR PRESSURE SWITCH AND HARNESS (REST POSITION)

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p4489, f4490

RESISTANCE LOW WATER PRESSURE & CONDENSE SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4493, f4494

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4501, !f4502

RESISTANCE CONDENSE PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE CONDENSE PRESSURE SWITCH

Next: !p4497, f4498

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: p4503, !f4504

RESISTANCE HIGH LIMIT THERMOSTAT AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p4505, f4506

VOLTAGE FAN AT PCB

{USEINSMAT}
GAIN

Next: p4530, f4531

VOLTAGE AT FAN

SELECTOR SWITCH SET

Next: !p4560, !f4561

DHW FLOW SWITCH AND HARNESS RESISTANCE

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4534, f4535

RESISTANCE AIR PRESSURE SWITCH AND HARNESS (REST POSITION)

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p4538, f4539

RESISTANCE LOW WATER PRESSURE & CONDENSE SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4542, f4543

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4550, f5647

RESISTANCE CONDENSE PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE CONDENSE PRESSURE SWITCH

Next: !p4546, f4547

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p4552, f4566

RESISTANCE HIGH LIMIT THERMOSTAT AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p4574, f4569

INSPECTION FLOW AND RETURN ISOLATION VALVES

Next: p674, !f738

MAX & MIN BURNER PRESSURES CORRECTLY ADJUSTED

Next: !p4591, !f4592

DHW BURNER PRESSURE MAX & MIN

SELECTOR SWITCH SET

Next: p3467, f4598

MAX & MIN BURNER PRESSURES CORRECTLY ADJUSTED

Next: !p4601, !f4602

DHW BURNER PRESSURE MAX & MIN

SELECTOR SWITCH SET

Next: p4792, f4607

MAX & MIN BURNER PRESSURES CORRECTLY ADJUSTED

Next: !p4610, !f4611

VOLTAGE AT PUMP

SELECTOR SWITCH SET TO CH/DHW
BOILER DHW THERMOSTAT SET TO MAX
REMOVE PUMP COVER

Next: !p4637, !f4638

PUMP LIMPET TEST

Next: p4667, !f4680

OBSERVATION DIVERTER VALVE ACTUATOR SPINDLE CH POSITION

SELECTOR SWITCH SET

Next: p4668, f4669

INSPECTION DIVERTER VALVE BODY

REMOVE LOCKING PIN A

Next: p4674, !f4675

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR CN3 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE

Next: !p4672, !f4673

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: p4676, !f4677

INSPECTION NON-RETURN VALVE

ISOLATE FLOW AND RET

Next: !p4678, !f4679

OBSERVATION PUMP RUNNING

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: p4688, f4682

VOLTAGE AT PUMP

SELECTOR SWITCH SET TO CH/DHW
BOILER DHW THERMOSTAT SET TO MAX
REMOVE PUMP COVER

Next: !p4685, !f4686

PUMP LIMPET TEST

Next: p4689, !f4690

OBSERVATION PUMP OVER-RUN

SELECTOR SWITCH SET

Next: p5238, !f5259

OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

SELECTOR SWITCH SET

Next: !p4693, ?4695, ?4697, ?4699

INSPECTION ARE EXTERNAL CONTROLS FITTED?

Next: p4701, f4702

BYPASS EXTERNAL CONTROLS

SELECTOR SWITCH SET

Next: !p4969, f4970

RESISTANCE DIVERTER VALVE HARNESS

REMOVE CONNECTOR CN3 FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE

Next: !p474, !f475

INSPECTION CONDENSATE PIPEWORK (BEFORE SIPHON)

REMOVE LEFT HAND SIDE PANEL

Next: p774, !f4777

PUMP LIMPET TEST

Next: p479, !f480

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p481, !f3147

INSPECTION BURNER MANIFOLD

REMOVE BURNER ASSEMBLY AND BURNER MANIFOLD

Next: p3503, !f4796

RESISTANCE DHW FLOW SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4799, f4800

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4803, !f4916

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p4807, f4808

OBSERVATION CH OPERATION FOR NOISE

SELECTOR SWITCH SET

Next: !p975, ?689, ?934

RESISTANCE MODULATING SOLENOID AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4832, f4833

VOLTAGE AT GAS VALVE MODULATING SOLENOID (MAX)

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: !p4838, !f4839

RESISTANCE MODULATING SOLENOID AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p4845, f4846

VOLTAGE AT GAS VALVE MODULATING SOLENOID (MAX)

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: !p4849, !f4850

INSPECTION DHW TEMPERATURE CONTROL SPINDLE

GAIN ACCESS TO PCB

Next: p2952, !f4918

INSPECTION FLUE

Next: !p4984, !f4985

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: !p4996, !f4997

RESISTANCE DHW FLOW SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p5015, f5016

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p5019, !f5020

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p5021, f5022

RESISTANCE DIVERTER VALVE AND HARNESS FOR FUSE INVESTIGATION

REMOVE CONNECTOR CN3 FROM THE PCB

Next: p5078, f5050

RESISTANCE PUMP AND HARNESS FOR FUSE INVESTIGATION

REMOVE CONNECTOR CN2 FROM THE PCB

Next: p5079, f5080

RESISTANCE FAN AND HARNESS FOR FUSE INVESTIGATION

REMOVE CONNECTOR CN4 FROM THE PCB

Next: p5088, f5084

RESISTANCE GAS VALVE AND HARNESS FOR FUSE INVESTIGATION

REMOVE CONNECTOR CN5 FROM THE PCB

Next: p5089, f5090

RESISTANCE MODULATING SOLENOID AND HARNESS FOR FUSE INVESTIGATION

REMOVE CONNECTOR CN9 FROM THE PCB

Next: !p5096, f5093

RESISTANCE TO EARTH TEST (ELECTRODE)

GAIN ACCESS TO SPARK ELECTRODE
REMOVE CONNECTOR CN6 FROM THE PCB

Next: !p5126, !f5127

RESISTANCE IGNITION TRANSFORMER (FLAME SENSE)

REMOVE CONNECTOR CN6 FROM THE PCB

Next: !p5129, f5130

RESISTANCE ELECTRODE AND HARNESS

Next: !p5133, !f5134

TEMPERATURE DIFFERENTIAL DHW HEAT EXCHANGER

SELECTOR SWITCH SET

Next: p5260, f5281

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

SELECTOR SWITCH SET

Next: p4691, !f5282

INSPECTION NON-RETURN VALVE

ISOLATE FLOW AND RET

Next: p5290, !f5293

INSPECTION LATENT HEAT COLLECTOR INLET AND OUTLET

ISOLATE FLOW AND RET

Next: !p5291, !f5292

INSPECTION FAN AND VENTURIS

REMOVE FAN AND THE FAN VENTURI (LOCATED IN FAN OUTLET)

Next: p5297, ?5637, ?5639

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE AIR PRESSURE SWITCH TUBES

Next: p5299, !f5300

AIR PRESSURE SWITCH PROVING

DISCONNECT LEADS FRO

Next: p5301, !f5302

INSPECTION CONDENSATE PIPE

Next: p5303, !f5304

INSPECTION MAIN HEAT EXCHANGER

GAIN ACCESS TO MAIN HEAT EXCHANGER

Next: p5305, !f5306

INSPECTION LATENT HEAT COLLECTOR

GAIN ACCESS TO THE L

Next: p5307, !f5308

INSPECTION FLUE

Next: !p5617, !f5369

VOLTAGE AT FAN (CONSTANT)

SELECTOR SWITCH SET

Next: p5296, !f5386

RESISTANCE LOW WATER PRESSURE & CONDENSE SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p5653, f5442

RESISTANCE CONDENSE PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE CONDENSE PRESSURE SWITCH

Next: !p5445, !f5446

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p2687, !f5490

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: p2690, !f5539

OBSERVATION - IS IGNITION PCB FITTED ON TO THE MAIN PCB

GAIN ACCESS TO PCB

Next: p5541, !f5542

RESISTANCE BETWEEN IGNITION PCB AND MAIN PCB CONNECTING PINS

Next: p5543, f5544

VOLTAGE AT IGNITION PCB

{USEINSMAT}
GAIN

Next: p5547, f5548

VOLTAGE TO IGNITION TRANSFORMER

{USEINSMAT}
SELECTOR SWITCH SET TO CH/DHW POSITION

Next: p5565, !f5566

INSPECTION SPARK GAP

GAIN ACCESS TO THE ELECTRODE

Next: p5567, !f5568

RESISTANCE ELECTRODE AND HARNESS

Next: !p5569, !f5570

VOLTAGE AT PCB - APS PROVED

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: !p5605, f5587

INSPECTION FAN VENTURIS

REMOVE THE FAN AND VENTURIS

Next: p5591, !f5592

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE AIR PRESSURE SWITCH TUBES

Next: p5593, !f5594

AIR PRESSURE SWITCH PROVING

DISCONNECT LEADS FRO

Next: p5606, !f5596

INSPECTION CONDENSATE PIPE

Next: p5597, !f5598

INSPECTION MAIN HEAT EXCHANGER

GAIN ACCESS TO MAIN HEAT EXCHANGER

Next: p5599, !f5600

INSPECTION LATENT HEAT COLLECTOR

GAIN ACCESS TO THE L

Next: p5601, !f5602

INSPECTION FLUE

Next: !p5603, !f5604

RESISTANCE AIR PRESSURE SWITCH HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB
REMOVE THE LEADS FROM THE APS MAKING A NOTE OF THEIR POSITIONS

Next: p5595, !f5616

OBSERVATION SYSTEM PRESSURE

Next: p5628, !f5629

RESISTANCE LOW WATER PRESSURE & CONDENSE SWITCH AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: !p5630, f5631

PUMP LIMPET TEST

Next: p741, !f742

RESISTANCE CONDENSE PRESSURE SWITCH

DISCONNECT THE WIRES FROM THE CONDENSE PRESSURE SWITCH

Next: !p5634, !f5635

RESISTANCE HEAT THERMISTOR AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p5643, f5644

RESISTANCE HIGH LIMIT THERMOSTAT AND HARNESS

REMOVE CONNECTOR CN8 FROM THE PCB

Next: !p5654, f5655

OBSERVATION IS CO FUNCTION ACTIVE

SELECTOR SWITCH SET TO OFF/RESET POSITION

Next: p65, f66

CO FUNCTION RESET

REMOVE THE SELECTOR CONTROL KNOB

Next: !p2376, !f2425

OBSERVATION SYSTEM PRESSURE AND AIR

Next: p563, !f806

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: p743, !f754

INSPECTION INTERNAL BY-PASS

ISOLATE FLOW AND RET

Next: p752, !f755

TEMPERATURE DIFFERENTIAL MAIN HEAT EXCHANGER

SELECTOR SWITCH SET

Next: !p977, ?759, ?944

INSPECTION CONDENSATE PIPE

Next: p2926, !f2937

INSPECTION DHW FLOW LIMITER

ISOLATE COLD MAINS A

Next: p85, !f86

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE COLD MAINS AND DRAIN DHW CIRCUIT
REMOVE DHW FLOW SWITCH ASSEMBLY

Next: !p88, !f89

BURNER PRESSURE

SELECTOR SWITCH SET

Next: p1001, f4103

RESISTANCE DHW THERMISTOR AND HARNESS

REMOVE CONNECTOR CN9 FROM THE PCB

Next: p985, !f2388

RESISTANCE HEAT THERMISTOR

REMOVE THE RIGHT HAND SIDE PANEL
REMOVE CONNECTOR FROM THE HEAT THERMISTOR

Next: p987, !f2389

BURNER PRESSURES

SELECTOR SWITCH SET

Next: p989, f990

VOLTAGE RECTIFICATION

{USEINSMAT}
GAIN

Next: !p2392, ?5122, ?5124

Welcome to the XSol Diagnostic System