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:

4704436 VAILLANT ECOTEC PRO 24

GLOBAL

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

4704436 VAILLANT ECOTEC PRO 24

OUTER CASE REMOVA

Next: &597, !f2

FAN RUNS

TURN DHW TEMPERATURE SELECTOR TO MINIMUM AND ENSURE NO CH DEMAND

Next: &60, ?236, ?238

BURNER IGNITES AND ESTABLISHES

Next: &99, ?61, ?63, ?1304, ?1623, ?1697

CH DEMAND

ENSURE BOILER IS NOT UP TO TEMPERATURE

Next: &111, f894

DHW OPERATION

Next: &176, ?112, ?114, ?116, ?118, ?825

CH OPERATION

Next: &199, ?177, ?179, ?181

CENTRAL HEATING MODULATION

Next: &1208, f395

PUMP OVERRUN

Next: &406, !f204

PREHEAT OPERATION

ENSURE THE PLATE HEA

Next: &nff, f407

DHW FLOW RATE

Next: &444, f1010

DHW DEMAND

Next: &454, f1156

PUMP RUNS

Next: &52, ?455, ?457

TYPE OF DIAGNOSTIC PROCEDURE

Next: &603, !f598

ENHANCED FAULT CODES

Next: &1313, f604

F10/F0 FAULT CODE/ FLOW THERMISTOR

NOT USED

Next: &nff, f616

F11/F1 FAULT CODE/ RETURN THERMISTOR

NOT USED

Next: &nff, f624

F67 FAULT CODE

Next: &nff, f632

F70 FAULT CODE

Next: &nff, f636

F49 FAULT CODE

Next: &nff, f640

F76 FAULT CODE

Next: &nff, f654

F75 FAULT CODE PUMP RUNS

INTENTIONALLY BLANK HEADER FOR F75 FAULT CODE

Next: &nff, f678

F72 FAULT CODE

OUTSIDE MODEL

Next: &nff, f714

F13 FAULT CODE

Next: &nff, f908

FURTHER INVESTIGATION FUSE

NOT USED

Next: &nff, f923

FURTHER INVESTIGATION PCB

NOT USED

Next: &nff, f935

F63 FAULT CODE

BLANK PAGE OUTSIDE MODEL

Next: &nff, f949

F65 FAULT CODE

Next: &nff, f953

INFORMATION D34 FAN SPEED

TO ACCESS PARAMETER

Next: &nff, !f1009

F25 FAULT CODE

OK TO BE BLANK

Next: &nff, f1035

F32 FAULT CODE

OK TO BE BLANK

Next: &nff, f1178

EXCESSIVE SYSTEM PRESSURE RISE

Next: &203, !f1209

F61 AND F62 FAULT CODE

INTENTIONALLY BLANK HEADER FOR FAULT CODE F61 AND F62

Next: &nff, f1255

POWER UP

NO DEMANDS

Next: &420, f1314

CON FAULT

INTENTIONALLY BLANK HEADER FOR CON FAULT

Next: &nff, f1522

F22 / F73 / F74 FAULT CODE

INTENTIONALLY BLANK HEADER FOR FAULT CODE F22 / F73 AND F74

Next: &nff, f1429

F77 FAULT CODE

NOT USED

Next: &nff, f1516

F27 FAULT CODE

Next: &nff, f1667

INFORMATION D34 FAN SPEED

Z DIRECTION CHOICE OR CONTINUE

Next: End

FLOW RATE

SENSOR - FLOW

Next: End

DHW FLOW RATE

VALVE

Next: End

DHW FLOW RATE

COLD MAINS SUPPLY

Next: End

F25 FAULT CODE

SAFETY FUSE

Next: End

EXTERNAL CONTROLS INPUT 240

Next: End

BURNER DOES NOT LIGHT

TRAP - SIPHONIC CONDENSATE

Next: End

CH DEMAND 240

Next: End

GAS VALVE

HARNESS X20

Next: End

GAS INLET PRESSURE

GAS VALVE INLET PRESSURE

Next: End

BURNER IGNITION

FLUE

Next: End

BURNER IGNITION

HEAT EXCHANGER

Next: End

IGNITION ELECTRODES

ELECTRODE - IGNITION & MONITORING

Next: End

BURNER IGNITION

BURNER

Next: End

BURNER DOES NOT ESTABLISH

TRAP - SIPHONIC CONDENSATE

Next: End

DOES NOT ESTABLISH

GAS VALVE INLET PRESSURE

Next: End

FLAME SENSE

CABLE - IGNITION

Next: End

BURNER NOT ESTABLISHING

FLUE

Next: End

BURNER NOT ESTABLISHING

HEAT EXCHANGER

Next: End

FLAME SENSE ELECTRODE

ELECTRODE - IGNITION & MONITORING

Next: End

DHW COOL RADS HOT

HARNESS X2

Next: End

DHW COOL RADIATORS HOT

PCB

Next: End

HEAT EX NOISY

HARNESS X2

Next: End

HEAT EX NOISY

PCB

Next: End

CH OP

HARNESS X2

Next: End

CH OP

PCB

Next: End

AQUA SENSOR

HARNESS X2

Next: End

DHW DEMAND

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW DEMAND

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

F32 FAULT CODE FAN - SPEED CONTROL

HARNESS X20

Next: End

F32 FAULT CODE FAN DOES NOT RUN HARNESS FAN

HARNESS X20

Next: End

F32 FAULT CODE FAN PERMANENT VOLTAGE

PCB

Next: End

FAULT CODE 32

Z DIRECTION CHOICE OR CONTINUE

Next: End

F32 FAULT CODE - FAN HALL SENSOR

HARNESS X20

Next: End

F32 FAULT CODE - FAN HALL SENSOR

FAN

Next: End

F32 FAULT CODE FAN RUNS - SPEED CONTROL

FAN

Next: End

FAN RUNS - SPEED CONTROL

FAN

Next: End

EXPANSION VESSEL

EXPANSION VESSEL 10L

Next: End

FAN RUNS - NO DEMAND VOLTAGE TO FAN

PCB

Next: End

F32 FAULT CODE - NO DEMAND VOLTAGE TO FAN

PCB

Next: End

PUMP RUNS

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PUMP RUNS

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PUMP DOES NOT RUN

SYSTEM PRESSURE

Next: End

VOLTAGE PRESSURE SENSOR

PCB

Next: End

WATER PRESSURE SENSOR

HARNESS X2

Next: End

F62 GAS VALVE

VALVE - GAS

Next: End

HARNESS OVERHEAT 2

HARNESS X20

Next: End

F62 GAS VALVE AT IGNITION

VALVE - GAS

Next: End

F62 - NOT SHUTTING DOWN AT IGNITION

VALVE - GAS

Next: End

T2 FUSE FAILED

SET - 10 OFF FUSES 2.0 AT

Next: End

NOISEY DHW

FILTER

Next: End

NO DISPLAY

PCB

Next: End

FUSED SPUR FUSE

MAINS FUSE

Next: End

HEAT EXCHANGER NOISY

PUMP

Next: End

24 VOLT INPUT

PCB

Next: End

CH DEMAND 24

Next: End

NOT RESPONDING TO CH DEMAND

PCB

Next: End

AQUA SENSOR 2 (SHORTED)

HARNESS X2

Next: End

EBUS ERROR

PCB

Next: End

EBUS ERROR 2

PCB

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE

PUMP

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE

AIR VENT - AUTOMATIC

Next: End

F75

FILTER

Next: End

F75

TUBE - CONNECTION

Next: End

PUMP PULSES ON-OFF 75 FAULT CODE

EXPANSION VESSEL 10L

Next: End

PULSES ON_OFF

PUMP

Next: End

PUMP PULSES ON-OFF

AIR VENT - AUTOMATIC

Next: End

PUMP PULSES ON-OFF

FILTER

Next: End

PUMP RUNS

TUBE - CONNECTION

Next: End

PUMP PULSES ON_OFF

EXPANSION VESSEL 10L

Next: End

F73 / F74

SYSTEM PRESSURE

Next: End

PCB

PCB

Next: End

F73 / F74

HARNESS X2

Next: End

VOLTAGE AT PUMP F75 FAULT CODE

PCB

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE INTERMITTENT

SYSTEM PRESSURE

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE INTERMITTENT

PCB

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE INTERMITTENT

HARNESS X2

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE INTERMITTENT

PUMP

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE INTERMITTENT

AIR VENT - AUTOMATIC

Next: End

F75 INTERMITTENT

FILTER

Next: End

F75 INTERMITTENT

TUBE - CONNECTION

Next: End

PUMP PULSES ON-OFF 75 FAULT CODE INTERMITTENT

EXPANSION VESSEL 10L

Next: End

RADS DO NOT HEAT

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

RETURN (CH HOT TOO SOON)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

CH OPERATION

BY - PASS

Next: End

POOR CH

FILTER

Next: End

SPARKING

CABLE - IGNITION

Next: End

BURNER DOES NOT LIGHT - FAN HALL SENSOR

HARNESS X20

Next: End

BURNER DOES NOT LIGHT - FAN HALL SENSOR

FAN

Next: End

SPARKING WITH CONDESATE PUMP

CABLE - IGNITION

Next: End

BURNER DOES NOT LIGHT - FAN HALL SENSOR WITH CONDESATE PUMP

HARNESS X20

Next: End

BURNER DOES NOT LIGHT - FAN HALL SENSOR WITH CONDESATE PUMP

FAN

Next: End

F77 FAULT CODE

CONDENSATE PUMP (VAILLANT)

Next: End

CON FAULT - DEFINITELY PCB

PCB

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

BLOWING FUSE 2

PUMP

Next: End

BLOWING FUSE

PUMP

Next: End

FURTHER INVESTIGATION PCB FAIL

FAN

Next: End

DHW (TOO HOT)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW (TOO HOT)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW TOO COOL APP MOD

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW TOO COOL APP MOD

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW TOO COOL APP MOD

PUMP

Next: End

DHW TOO COOL APP MOD

FILTER

Next: End

DHW TOO COOL APP MOD

TUBE - CONNECTION

Next: End

DHW HOT COLD

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW DHW HOT COLD

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

DHW HOT COLD

PUMP

Next: End

DHW HOT COLD

FILTER

Next: End

DHW HOT COLD

TUBE - CONNECTION

Next: End

FURTHER INVESTIGATION PCB FAIL 2

PUMP

Next: End

FURTHER INVESTIGATION PCB FAIL

PUMP

Next: End

POOR HW RADS COOL

EXTERNAL MIXING

Next: End

DHW (GROK)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

F62 - NOT SHUTTING DOWN

VALVE - GAS

Next: End

F61/F62 VOLTAGE ISSUES OR CORRUPT RECTIFICATION

PCB

Next: End

BAFFLING

GAS VALVE INLET PRESSURE

Next: End

BAFFLING

INLET - AIR DUCT

Next: End

BAFFLING

TRAP - SIPHONIC CONDENSATE

Next: End

BAFFLING

FLUE

Next: End

BAFFLING

BURNER

Next: End

BAFFLING

HEAT EXCHANGER

Next: End

NO IGNITION

SAFETY FUSE

Next: End

DHW COOL RADIATORS COOL

INLET - AIR DUCT

Next: End

PUMP RUNS

SAFETY FUSE

Next: End

OH STAT

HARNESS X20

Next: End

OVERHEAT1

SAFETY FUSE

Next: End

F62 FAULT CODE

SAFETY FUSE

Next: End

F27

CABLE - IGNITION

Next: End

F27

ELECTRODE - IGNITION & MONITORING

Next: End

F27

PCB

Next: End

DHW OPERATION

FLUE

Next: End

FAULTY

PCB

Next: End

SHORTED

HARNESS X20

Next: End

SHORTED

HARNESS X2

Next: End

LOW CAUSING POOR IGNITION

GAS VALVE INLET PRESSURE

Next: End

RESTRICTED OR BLOCKED AFFECTING IGNITION

TRAP - SIPHONIC CONDENSATE

Next: End

CAUSING POOR SPARK

CABLE - IGNITION

Next: End

WARPED CAUSING POOR IGNITION

ELECTRODE - IGNITION & MONITORING

Next: End

DHW OPERATION

GAS VALVE INLET PRESSURE

Next: End

SPLIT OR BLOCKED CAUSING POOR IGNITION

BURNER

Next: End

DHW COOL RADIATORS COOL

PUMP

Next: End

CH OPERATION

DIVERTER VALVE BRASS

Next: End

SAFETY CHECKS

Z DIRECTION CHOICE OR CONTINUE

Next: End

CH MODULATION

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PUMP OVERRUN

PCB

Next: End

FAN HALL SENSOR

HARNESS X20

Next: End

HARNESS FAN

HARNESS X20

Next: End

FAN RUNS (CH DEMAND)

PCB

Next: End

FAN NOT RUNNING

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

RETURN (FAN NOT RUNNING)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

WATER COOL RADS COOL GROK

FILTER

Next: End

DHW OPERATION GROK

TRAP - SIPHONIC CONDENSATE

Next: End

DHW (GROK)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

RADS DO NOT HEAT999

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

RETURN SENSOR (CH COOL)

HARNESS X20

Next: End

CH OPERATION

TRAP - SIPHONIC CONDENSATE

Next: End

RETURN (CH MODULATION)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

PREHEAT (NOT WORKING)

SENSOR - NTC - HEAT EXCHANGER

Next: End

PUMP PULSES ON-OFF

SYSTEM PRESSURE

Next: End

PUMP PULSES ON_OFF

PCB

Next: End

PUMP PULSES ON_OFF

HARNESS X2

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODE DUM

Z DIRECTION CHOICE OR CONTINUE

Next: End

F0/F10 FAULT CODE

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

F11/1 FAULT CODE

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

F67 FAULT CODE

PCB

Next: End

F70 FAULT CODE

RESET TO FACTORY PARAMETERS

Next: End

HARNESS OVERHEAT1

HARNESS X20

Next: End

F76

OVERHEAT

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT3

PUMP

Next: End

SYS TEMP3

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

SYS TEMP3

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

OVERHEAT3

PCB

Next: End

OVERHEAT3

SAFETY FUSE

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE

SYSTEM PRESSURE

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE

PCB

Next: End

PUMP PULSES ON-OFFF75 FAULT CODE

HARNESS X2

Next: End

BURNER IGNITION

INLET - AIR DUCT

Next: End

F72 FAULT CODE

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

F72 FAULT CODE

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

HEAT EX NOISY

TUBE - CONNECTION

Next: End

BURNER ESTABLISH

INLET - AIR DUCT

Next: End

F13 FAULT CODE

SENSOR - NTC - HEAT EXCHANGER

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

VALVE - GAS

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION PCB FAIL

VALVE - GAS

Next: End

F63 FAULT CODE

PCB

Next: End

F65 FAULT CODE

PCB

Next: End

FLOW RATE

FILTER

Next: End

FLOW RATE

LIMITER

Next: End

FLOW RATE

HEAT EXCHANGER - PLATE

Next: End

F25 FAULT CODE

PCB

Next: End

EXTERNAL CONTROLS RETURN 240

Next: End

NO IGNITION - NO POWER TO GAS VALVE

PCB

Next: End

NO IGNITION - NOT OPENING

VALVE - GAS

Next: End

NO IGNITION - NOT OPENING FULLY

VALVE - GAS

Next: End

FLAME SENSE

PCB

Next: End

DHW COOL RADIATORS HOT

DIVERTER VALVE BRASS

Next: End

HEAT EX NOISY

DIVERTER VALVE BRASS

Next: End

CH OP

DIVERTER VALVE BRASS

Next: End

DHW DEMAND

SENSOR - FLOW

Next: End

FLOW SENSOR (DHW DEMAND)

HARNESS X20

Next: End

AQUA SENSOR

PCB

Next: End

RETURN SENSOR (DHW DEMAND)

HARNESS X20

Next: End

F32 FAULT CODE - HALL SENSOR

PCB

Next: End

F32 FAULT CODE FAN SPEED CONTROL

PCB

Next: End

DHW COOL RADIATORS HOT

DIVERTER VALVE BRASS

Next: End

FAN RUNS FAN SPEED CONTROL

PCB

Next: End

FAN RUNS

FAN

Next: End

F32 FAULT CODE FAN DOES NOT RUN

FAN

Next: End

FLOW SENSOR

HARNESS X20

Next: End

RETURN SENSOR

HARNESS X20

Next: End

PUMP RUNS

SENSOR - WATER PRESSURE

Next: End

PCB PUMP RUNS

PCB

Next: End

F62 FAULT CODE

HARNESS X20

Next: End

F62 FAULT CODE AT IGNITION

HARNESS X20

Next: End

F61/F62 VOLTAGE ISSUES OR CORRUPT RECTIFICATION AT IGNITION

PCB

Next: End

SUPPLY FAULT AT POWER UP

Next: End

T2 FUSE FAILED

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAULTY

DISPLAY

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER - PLATE

Next: End

MAINS FUSE FAILED

Z DIRECTION CHOICE OR CONTINUE

Next: End

24 VOLT CONTROL RETURN

PCB

Next: End

PREVENTING HEATING OPERATION

EBUS CONTROLS

Next: End

SHORTED

SENSOR - FLOW

Next: End

DHW DEMAND

PCB

Next: End

GENERATING FAULT CODE

EBUS CONTROLS

Next: End

F73 / F74

PCB

Next: End

F22 / F73 / F74

SENSOR - WATER PRESSURE

Next: End

PUMP PULSING F75 (3)

SENSOR - WATER PRESSURE

Next: End

PUMP PULSING F75 (2)

SENSOR - WATER PRESSURE

Next: End

PUMP PULSING F75 INTERMITTENT

SENSOR - WATER PRESSURE

Next: End

INTERMITTENT FAULT

SENSOR WATER PRESSURE

Next: End

FLOW SENSOR (RADS DO NOT HEAT)

HARNESS X20

Next: End

RETURN SENSOR (RADS DO NOT HEAT)

HARNESS X20

Next: End

RADS DO NOT HEAT

Next: End

BURNER DOES NOT LIGHT - HALL SENSOR

PCB

Next: End

NO SPARKING

CONDENSATE PUMP (VAILLANT)

Next: End

BURNER DOES NOT LIGHT - HALL SENSOR WITH CONDESATE PUMP

PCB

Next: End

F77 FOR NO REASON

PCB

Next: End

F77 FAULT CODE 2

PCB

Next: End

CON FAULT

PCB - CON FAULT

Next: End

PUMP RUNS

PUMP

Next: End

PUMP RUNSF75 FAULT CODE

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS X20

Next: End

FUSE BLOWN

PCB FUSE BLOWN

Next: End

FUSE BLOWN ORIGINAL PUMP

PCB FUSE BLOWN

Next: End

FURTHER INVESTIGATION PCB FAIL

HARNESS X20

Next: End

FLOW SENSOR (DHW TOO HOT)

HARNESS X20

Next: End

DHW TOO HOT

PCB

Next: End

RETURN SENSOR (DHW TOO HOT)

HARNESS X20

Next: End

FLOW SENSOR DHW COOL APPL MOD

HARNESS X20

Next: End

RETURN SENSOR DHW COOL APPL MOD

HARNESS X20

Next: End

DHW TOO COOL APP MOD

PCB

Next: End

DHW TOO COOL APP MOD

HEAT EXCHANGER - PLATE

Next: End

DHW TOO COOL APP MODD

HEAT EXCHANGER

Next: End

FLOW SENSOR DHW HOT COLD

HARNESS X20

Next: End

RETURN SENSOR DHW HOT COLD

HARNESS X20

Next: End

DHW HOT COLD

PCB

Next: End

DHW HOT COLD

HEAT EXCHANGER - PLATE

Next: End

DHW HOT COLD

HEAT EXCHANGER

Next: End

FURTHER INVESTIGATION 2

PCB

Next: End

FURTHER INVESTIGATION

PCB

Next: End

RETURN SENSOR (DHW GROK)

HARNESS X20

Next: End

F61 / F62 RETEST APPLIANCE

Z DIRECTION CHOICE OR CONTINUE

Next: End

BAFFLING

VALVE - GAS

Next: End

PUMP RUNS

HARNESS - CABLE TREE

Next: End

OVERHEAT 1

HARNESS - CABLE TREE

Next: End

F25 FAULT CODE

HARNESS - CABLE TREE

Next: End

HIGH SPEED

FAN

Next: End

F27 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

PCB FURTHER INVESTIGATION

Z DIRECTION CHOICE OR CONTINUE

Next: End

SHORTED

FAN

Next: End

BLANK DISPLAY

SENSOR - WATER PRESSURE

Next: End

WEAK SPARK

PCB

Next: End

WRONG MIX CAUSING POOR IGNITION

VALVE - GAS

Next: End

MODULATION

VALVE - GAS

Next: End

CH NOISY

Next: End

FLOW SENSOR (DHW FAN NOT RUNNING)

HARNESS X20

Next: End

RETURN SENSOR (DHW FAN NOT RUNNING)

HARNESS X20

Next: End

DHW COOL RADIATORS COOL GROK

HEAT EXCHANGER - PLATE

Next: End

FLOW SENSOR (DHW GROK)

HARNESS X20

Next: End

FLOW SENSOR (CH COOL)

HARNESS X20

Next: End

RETURN SESNOR (CH COOL)

SENSOR - NTC - CH FLOW / CH RETURN

Next: End

CH OPERATION (TOO COOL)

Next: End

CH MODULATION

PCB

Next: End

FLOW SENSOR (CH MODULATION)

HARNESS X20

Next: End

RETURN SENSOR (CH MODULATION)

HARNESS X20

Next: End

PREHEAT (NOT WORKING)

PCB

Next: End

PREHEAT (NOT WORKING)

HARNESS X2

Next: End

PUMP PULSES ON_OFF

SENSOR - WATER PRESSURE

Next: End

FAULT CODES DUM

Z DIRECTION CHOICE OR CONTINUE

Next: End

F10-F0 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F1/F2 FAULT CODES

PCB

Next: End

SENSOR PRIMARY F0/F10 FAULT CODE

HARNESS X20

Next: End

F11-F1 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F11/F1 FAULT CODE

PCB

Next: End

SENSOR TEMP RETURN F11/1 FAULT CODE

HARNESS X20

Next: End

F67 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F70 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F49 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT STAT OK1

PCB

Next: End

OVERHEAT STAT OK3

PCB

Next: End

PUMP PULSING F75

SENSOR - WATER PRESSURE

Next: End

F72 FAULT CODE

PCB

Next: End

RETURN SENSOR F72 FAULT CODE

HARNESS X20

Next: End

PRIMARY SENSOR F72 FAULT CODE

HARNESS X20

Next: End

HEAT EXCHANGER NOISY

HEAT EXCHANGER

Next: End

F13 FAULT CODE

PCB

Next: End

F13 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F13 FAULT CODE

HARNESS X2

Next: End

CH DEMAND

TIME SWITCH

Next: End

FURTHER INVESTIGATION FUSE F1 MAIN SOLENOID

HARNESS X20

Next: End

FURTHER INVESTIGATION MAIN SOLENOIDPCB FAIL

HARNESS X20

Next: End

F63 RESTEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

F65 RETEST BOILER

Z DIRECTION CHOICE OR CONTINUE

Next: End

INLET FILTER FAULTY

CHARACTERISTIC TEST FROM INLET/FILTER FLOW REG

Next: !p1027

INLET REGULATOR FAULTY

CHARACTERISTIC TEST FROM INLET/FILTER FLOW REG

Next: !p1029

DHW TOO COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p113

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1555

HEAT EXCHANGER NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p117

DHW COOL, RADIATORS HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p119

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS

Next: p1181

FAN RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM FAN RUNS

Next: p1183

F61 OR F62 SHOWN AFTER DEMAND

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1306

24 VOLT CONTROLS FITTED

CHARACTERISTIC TEST FROM OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED?

Next: p1369

EBUS CONTROLS FITTED

CHARACTERISTIC TEST FROM OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED?

Next: p1368

APPLIANCE MODULATES BEFORE GAS RATE CAN BE TAKEN

CHARACTERISTIC TEST FROM GAS RATE

Next: p1564

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION PUMP BEHAVIOUR F75

Next: p1445

PUMP RUNS OR F75 OCCURING INTERMITTENTLY

CHARACTERISTIC TEST FROM OBSERVATION PUMP BEHAVIOUR F75

Next: p1450

GAS RATE CORRECT BUT STILL TOO COOL

CHARACTERISTIC TEST FROM GAS RATE

Next: p315

BURNER IGNITES BUT BAFFLES OUT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1624

BURNER IGNITES BUT IGNITION POOR (HEAVY/DELAYED/EXPLOSIVE/SLOW)

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1698

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM CH OPERATION

Next: p354

CH NOISY, DHW OK

CHARACTERISTIC TEST FROM CH OPERATION

Next: p180

BOILER REACHES TEMPERATURE, RADS DO NOT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p182

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS

Next: p261

FAN RUNS CONTINUOUSLY

CHARACTERISTIC TEST FROM FAN RUNS

Next: p247

PUMP PULSES ON-OFF_THEN LOCK OUT F75

CHARACTERISTIC TEST FROM PUMP RUNS

Next: p456

DOES NOT RUN

CHARACTERISTIC TEST FROM PUMP RUNS

Next: p458

BURNER LIGHTS BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p62

BURNER DOES NOT LIGHT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p64

DHW COOL, BOILER REACHES TEMP AND MODULATES OR CUTS OUT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1583

04/08/2021 08:13:04 2108_1_50_1 23/09/2021 09:28:40

25/08/2021 13:37:16

Next: End

OBSERVATION WHAT TYPE OF EXTERNAL CONTROLS ARE FITTED?

Next: p101, ?1365, ?1367

DHW ISOLATING VALVE

Next: p1023, !f1032

RESISTANCE OVERHEAT STAT AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: !p1069, !f1037

VOLTAGE GAS VALVE AT PCB

DISCONNECT PLUG FROM GAS VALVE AND MAKE SAFE

Next: p1102, f1103

RESISTANCE OVERHEAT STAT AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: !p1104, !f1647

PCB VOLTS TO AQUA SENSOR

{USEINSMAT}

Next: p1157, f1376

AQUA SENSOR HARNESS RESISTANCE

REMOVE THE PLUG FROM X2 ON THE PCB AND THE PLUG FROM THE AQUA FLOW SENSOR

Next: !p1161, !f1162

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1165, !f1166

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1169, !f1170

FAN RUNS

TURN DHW TEMPERATURE SELECTOR TO MINIMUM AND ENSURE NO CH DEMAND

Next: p1179, ?1180, ?1182

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1228, f1229

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1230, !f1231

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1234, !f1235

HARNESS PRESSURE SWITCH

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p1242, !f1243

RESISTANCE OVERHEAT STAT AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1263, f1301

RESISTANCE GAS VALVE SOLENOID MAIN F61

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p1271, !f1272

RESISTANCE OVERHEAT HARNESS

DISCONNECT X20 CONNECTOR FROM THE PCB
DISCONNECT THE LEAD TO THE OVERHEAT STAT

Next: p1637, !f1303

RESISTANCE GAS VALVE SOLENOID MAIN F61

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p1309, !f1310

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{USEINSMAT}
REMOVE CONTROL BOX COVER

Next: p1341, f1316

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1317, f1362

PRIMARY FLOW FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p857, !f135

FUSE FURTHER INVESTIGATION F2

Next: !p1344, !f1345

FUSE FURTHER INVESTIGATION (MAINS FUSE)

Next: !p1363, !f1364

VOLTAGE DC TO AQUA SENSOR (SENSOR DISCONNECTED)

REMOVE CONNECTOR FROM AQUA SENSOR AND MAKE SAFE

Next: !p1377, f1378

AQUA SENSOR HARNESS RESISTANCE

REMOVE THE PLUG FROM X2 ON THE PCB AND THE PLUG FROM THE AQUA FLOW SENSOR

Next: !p1379, !f1380

OBSERVATION ARE ANY EBUS CONTROLS FITTED

GAIN ACCESS TO THE PCB

Next: p1382, !f1383

SYSTEM PRESSURE

Next: p1430, !f1431

PRESSURE SENSOR VOLTAGE (PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p1436, !f1435

HARNESS PRESSURE SWITCH

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p1457, !f1458

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1486, !f1487

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1490, !f1491

OBSERVATION CONNECTOR X40 (CONDENSATE PUMP)

GAIN ACCESS TO PCB

Next: p1498, f1505

DISCONNECT X40 DOES SPARKING OCCUR?

REMOVE CONNECTOR X40 FROM THE PCB AND MAKE SAFE

Next: !p1506, f1508

RESISTANCE HARNESS IGNITION

REMOVE THE LEAD FROM THE SPARK GENERATOR
AND THE IGNITION ELECTRODE

Next: p1509, !f1510

OBSERVATION CONNECTOR X40 (CONDENSATE PUMP)

GAIN ACCESS TO PCB

Next: !p1517, f1518

OBSERVATION F77 RESET (CONDENSATE PUMP DISCONNECTED)

REMOVE CONDENSATE PUMP CONNECTOR FROM X40 AND MAKE SAFE

Next: !p1519, !f1520

VOLTAGE TO DISPLAY (AT PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: !p1523, !f1524

RESISTANCE FAN

DISCONNECT THE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1533, !f1534

RESISTANCE PUMP AND HARNESS

REMOVE X18 FROM THE PCB

Next: !p1537, !f1542

RESISTANCE FAN

DISCONNECT THE CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1547, !f1548

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1558, !f1559

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1562, !f1563

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1567, !f1568

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1571, !f1572

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED
(DO NOT ATTACH CLAMPS TO THE RUBBER HOSE)

Next: !p1577, f1578

PRIMARY FLOW FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p1579, !f1580

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p1586, !f1587

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1590, !f1591

DIFFERENTIAL PRIMARY HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED
(DO NOT ATTACH CLAMPS TO THE RUBBER HOSE)

Next: !p1596, f1597

PRIMARY FLOW FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p1598, !f1599

RESISTANCE PUMP AND HARNESS

REMOVE X18 FROM THE PCB

Next: !p1607, !f1608

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p1617, !f1618

RESISTANCE OVERHEAT HARNESS

DISCONNECT X20 CONNECTOR FROM THE PCB
DISCONNECT THE LEAD TO THE OVERHEAT STAT

Next: p1654, !f1657

RESISTANCE HARNESS IGNITION

REMOVE THE LEAD FROM THE SPARK GENERATOR
AND THE IGNITION ELECTRODE

Next: p1676, !f1669

FLUE CHECK

Next: !p168, !f169

VOLTAGE 24 VDC AND 5 VDC X2 AND X20 REMOVED

REMOVE CONNECTORS X2 AND X20 FROM THE PCB

Next: p1687, f1688

PCB FURTHER INVESTIGATION

Next: !p1689, !f1690

VOLTAGE 24VDC AND 5 VDC FAN REMOVED

BOTH CONNECTOR X2 AND X20 SHOULD BE FITTED TO THE PCB
REMOVE CONNECTOR FROM FAN AND MAKE SAFE

Next: !p1693, !f1694

RESISTANCE HARNESS IGNITION

REMOVE THE LEAD FROM THE SPARK GENERATOR
AND THE IGNITION ELECTRODE

Next: !p1706, !f1707

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p402, !f202

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p275, !f276

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p284, !f285

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p328, !f333

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p366, !f363

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p370, !f371

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p399, f200

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p403, !f404

PLATE HEAT EXCHANGER SENSOR & HARNESS

REMOVE THE CONNECTOR X2 FROM THE PCB

Next: !p408, f409

PLATE HEAT EXCHANGER SENSOR

REMOVE THE SECONDARY SENSOR FROM THE SECONDARY HEAT EXCHANGER

Next: !p410, !f411

HARNESS PRESSURE SWITCH

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p495, !f496

VOLTAGE DIVERTER MOTOR AT PCB

{USEINSMAT}
DISCONNECT THE PLUG FROM THE DIVERTER MOTOR AND MAKE SAFE
NO DEMANDS

Next: p1142, !f1145

ENHANCED FAULT CODES

Next: !p605, !f606

LOCKOUT RESET FLOW THERMISTOR

Next: !p617, f618

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: !p619, f620

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p621, !f622

LOCKOUT RESET RETURN THERMISTOR

Next: !p625, f626

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p627, f628

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p629, !f630

LOCKOUT RESET F 67

Next: !p633, !f634

LOCKOUT RESET F 70

ON/OFF SWITCH ON

Next: !p637, !f638

LOCKOUT RESET F 49

ON/OFF SWITCH ON

Next: !p641, f1381

LOCKOUT RESET F76

Next: p655, f656

RESISTANCE OVERHEAT STAT AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: !p657, f658

RESISTANCE OVERHEAT HARNESS

DISCONNECT X20 CONNECTOR FROM THE PCB
DISCONNECT THE LEAD TO THE OVERHEAT STAT

Next: p1643, !f660

OBSERVATION PUMP BEHAVIOUR F75

Next: p679, ?1441, ?1443

HARNESS PRESSURE SWITCH

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p693, !f694

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p726, f739

RESISTANCE SENSOR TEMP RETURN

REMOVE CONNECTOR FROM RETURN SENSOR

Next: !p737, !f738

RESISTANCE SENSOR TEMP PRIMARY

REMOVE THE LEADS FROM THE FLOW SENSOR

Next: !p742, !f740

VOLTAGE DIVERTER MOTOR AT PCB

{USEINSMAT}
DISCONNECT THE PLUG FROM THE DIVERTER MOTOR AND MAKE SAFE
NO DEMANDS

Next: p1147, !f1150

DISCONNECT TIMER INTERNAL

DISCONNECT THE INTERNAL PROGRAMMER TO THE RIGHT OF THE DISPLAY BOARD

Next: !p916, f100

LOCKOUT RESET F13

Next: !p912, f910

RESISTANCE WARM START SENSOR AND HARNESS

REMOVE CONNECTOR X2 FROM THE PCB

Next: !p911, f913

RESISTANCE WARM START SENSOR

DISCONNECT THE LEADS

Next: !p914, !f915

VOLTAGE DIVERTER MOTOR AT PCB

{USEINSMAT}
DISCONNECT THE PLUG FROM THE DIVERTER MOTOR AND MAKE SAFE
NO DEMANDS

Next: p1152, !f1155

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT X20 FROM PCB

Next: p1530, f925

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p926, !f927

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT X20 FROM PCB

Next: p1544, f937

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p938, !f939

LOCKOUT RESET F63

Next: !p950, !f951

LOCKOUT RESET F65

Next: !p954, !f955

EXTERNAL CONTROLS SUPPLY

{USEINSMAT}
ENSURE EXTERNAL CONTROLS ARE CALLING

Next: p107, !f108

OBSERVATION COLD MAINS SUPPLY

Next: p1024, !f1033

INLET/FILTER FLOW REGULATOR

DHW SERVICE VALVE OFF
APPLIANCE DRAINED AND DISCHARGED

Next: p1025, ?1026, ?1028

AQUA SENSOR (FLOW SWITCH)

DHW DISCHARGED AND DRAINED

Next: !p1030, !f1031

EXTERNAL CONTROLS OUTPUT (240)

{USEINSMAT}

Next: !p109, !f110

CONDENSATE TRAP CLEAR

Next: p1098, !f1099

GAS USAGE

ATTACH PRESSURE GAUG

Next: p1100, f1101

INLET PRESSURE

ATTACH PRESSURE GAU

Next: p1108, !f1109

HARNESS RESISTANCE GAS VALVE

REMOVE THE PLUG FROM THE GAS VALVE AND UNPLUG THE
CONNECTOR MARKED X20 FROM THE PCB

Next: !p1106, !f1107

INSPECTION FLUE

Next: p1110, !f1111

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FAN AND BURNER ASSEMBLY

Next: p1112, !f1113

SPARK & FLAME SENSE ELECTRODE INSPECTION

Next: p1114, !f1115

INSPECTION BURNER

Next: !p1116, !f1117

CONDENSATE TRAP CLEAR

Next: p1119, !f1120

INLET PRESSURE

ATTACH PRESSURE GAU

Next: p1121, !f1122

RESISTANCE HARNESS IGNITION

REMOVE THE LEAD FROM THE SPARK GENERATOR
AND THE IGNITION ELECTRODE

Next: p1123, !f1124

INSPECTION FLUE

Next: p1125, !f1126

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FAN AND BURNER ASSEMBLY

Next: p1127, !f1128

SPARK & FLAME SENSE ELECTRODE INSPECTION

Next: !p1129, !f1130

GAS RATE

Next: p142, ?144, ?146

DV HARNESS CONTINUITY

REMOVE THE CONNECTOR X2 FROM THE PCB
REMOVE THE PLUG FROM THE DIVERTER VALVE

Next: !p1143, !f1144

DV HARNESS CONTINUITY

REMOVE THE CONNECTOR X2 FROM THE PCB
REMOVE THE PLUG FROM THE DIVERTER VALVE

Next: !p1148, !f1149

DV HARNESS CONTINUITY

REMOVE THE CONNECTOR X2 FROM THE PCB
REMOVE THE PLUG FROM THE DIVERTER VALVE

Next: !p1153, !f1154

PCB VOLTS FROM AQUA SENSOR

{USEINSMAT}

Next: p1159, f1160

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1163, f1164

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p1167, f1168

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: p126, f889

OBSERVATION F32 REOCCURS

Next: p1192, !f1193

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1188, !f1189

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1184, !f1185

VOLTAGE FAN SPEED CONTROL

LEAVE CONNECTOR IN PLACE

Next: !p1199, !f1198

FAN VOLTAGE

{USEINSMAT}
DISCONNECT CONNECTOR FROM THE FAN AND MAKE SAFE

Next: p1213, !f1191

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p120, f577

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1194, !f1195

VOLTAGE FAN HALL SENSOR

LEAVE CONNECTOR IN PLACE

Next: !p1196, !f1197

VOLTAGE FAN SPEED CONTROL

LEAVE CONNECTOR IN PLACE

Next: !p1201, !f1202

VOLTAGE PCB DEMAND TO FAN

{USEINSMAT}
TURN

Next: !p1211, !f1212

VOLTAGE PCB DEMAND TO FAN

{USEINSMAT}
TURN

Next: !p1214, !f1215

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1232, f1233

SYSTEM PRESSURE

Next: p1236, !f1237

PRESSURE SENSOR VOLTAGE (PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p1238, !f1239

VOLTAGE PRESSURE SENSOR (OUT)

{USEINSMAT}
NO DEMAND
GAIN ACCESS TO PCB AS NECESSARY

Next: p1240, f1241

RESISTANCE OVERHEAT STAT AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: !p1244, f1650

CH OPERATION (DHW OPERATION)

Next: p132, f133

RESISTANCE GAS VALVE AND HARNESS F61/F62

DISCONNECT X20 FROM PCB

Next: p1295, f1270

TIGHTNESS TEST GAS VALVE

Next: p1619, !f1620

RESISTANCE GAS VALVE AND HARNESS F61/F62

DISCONNECT X20 FROM PCB

Next: p1307, f1308

TIGHTNESS TEST GAS VALVE

Next: !p1311, !f1312

PUMP LIMPET

Next: !p136, !f137

RESISTANCE FUSE T2 ( APPLIANCE)

REMOVE FUSE FROM FUSE HOLDER ON PCB

Next: p1348, f1343

VOLTAGE 24 VDC AND 5 VDC ON PCB

Next: p1350, f1686

VOLTAGE TO DISPLAY (AT PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: !p1351, !f1352

DISCONNECT EBUS CONTROLS

DISCONNECT EBUS WIRING AND MAKE SAFE

Next: !p1374, !f1375

EXTERNAL CONTROLS INPUT( 24)

{USEINSMAT}
ENSURE APPLIANCE IS IN CH MODE

Next: p1370, !f1371

EXTERNAL CONTROLS OUTPUT ( PCB24)

{USEINSMAT}

Next: !p1372, !f1373

DISCONNECT EBUS CONTROLS - FAULT CODE

DISCONNECT EBUS WIRING AND MAKE SAFE

Next: !p1384, !f1385

CHECK PUMP OPERATION

REMOVE VENT PLUG FRO

Next: p1387, !f1388

AUTO AIR VENT/ AIR SYSTEM

Next: p1402, !f1390

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DISCHARGED AND DRAINED

Next: p1403, !f1404

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: p1405, !f1406

EXPANSION VESSEL

FLOW AND RETURN ISOLATION VALVES CLOSED
DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p1439, !f1408

CHECK PUMP OPERATION

REMOVE VENT PLUG FRO

Next: p1410, !f1411

AUTO AIR VENT/ AIR SYSTEM

Next: p1422, !f1413

AIR INTAKE CLEAR

REMOVE THE AIR INTAKE PIPE
THE AIR INTAKE IS HELD BY ONE SCREW ATTACHED TO THE HEAT EXCHANGER

Next: p164, !f165

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DISCHARGED AND DRAINED

Next: p1423, !f1424

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: p1425, !f1426

EXPANSION VESSEL

FLOW AND RETURN ISOLATION VALVES CLOSED
DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p1440, !f1428

VOLTAGE PRESSURE SENSOR (OUT)

{USEINSMAT}
NO DEMAND
GAIN ACCESS TO PCB AS NECESSARY

Next: !p1432, f1433

HARNESS PRESSURE SWITCH

DISCONNECT CONNECTOR X2 FROM THE PCB
DISCONNECT CONNECTOR FROM THE LOW WATER PRESSURE SWITCH

Next: !p1437, !f1438

PUMP VOLTAGE PCB

DISCONNECT CONNECTOR X18 FROM THE PCB
(PLACE IN A SAFE POSITION)

Next: !p1528, !f1447

SYSTEM PRESSURE

Next: p1451, !f1452

PRESSURE SENSOR VOLTAGE (PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p1453, !f1454

VOLTAGE PRESSURE SENSOR (OUT)

{USEINSMAT}
NO DEMAND
GAIN ACCESS TO PCB AS NECESSARY

Next: p1455, f1456

PUMP LIMPET

Next: p1459, !f1460

AUTO AIR VENT/ AIR SYSTEM

Next: p1461, !f1462

INSPECTION FILTER PRIMARY CIRCUIT

APPLIANCE DISCHARGED AND DRAINED

Next: p1463, !f1464

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: p1465, !f1466

EXPANSION VESSEL

FLOW AND RETURN ISOLATION VALVES CLOSED
DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p1470, !f1468

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1484, f1485

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1488, f1489

AUTO BYPASS

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

Next: p1494, !f1493

PRIMARY FLOW FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: !p1495, !f1496

RESISTANCE HARNESS IGNITION

REMOVE THE LEAD FROM THE SPARK GENERATOR
AND THE IGNITION ELECTRODE

Next: p1499, !f1500

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1501, !f1502

VOLTAGE FAN HALL SENSOR

LEAVE CONNECTOR IN PLACE

Next: !p1503, !f1504

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1511, !f1512

VOLTAGE FAN HALL SENSOR

LEAVE CONNECTOR IN PLACE

Next: !p1513, !f1514

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR X20 FROM THE PCB

Next: p1531, f1532

OBSERVATION WHICH TYPE OF PUMP IS FITTED

ORIGINALLY VAILLANT

Next: p1538, f1535

RESISTANCE PUMP AND HARNESS (ORIGINAL PUMP)

REMOVE CONNECTOR X18 FROM THE PCB

Next: !p1539, !f1541

RESISTANCE FAN AND HARNESS

DISCONNECT CONNECTOR X20 FROM THE PCB

Next: p1545, f1546

OBSERVATION WHICH TYPE OF PUMP IS FITTED

ORIGINALLY VAILLANT

Next: p1603, f1606

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1556, f1557

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p1560, f1561

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1565, f1566

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1569, f1570

PUMP LIMPET

Next: p1573, !f1574

DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED
(DO NOT ATTACH CLAMPS TO THE RUBBER HOSE)

Next: !p1575, f1576

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p1581, !f1582

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p1584, f1585

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1588, f1589

PUMP LIMPET

Next: p1592, !f1593

DIFFERENTIAL DHW HEAT EXCHANGER

ATTACH TEMPERATURE CLAMPS AS INDICATED
(DO NOT ATTACH CLAMPS TO THE RUBBER HOSE)

Next: !p1594, f1595

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p1600, !f1601

RESISTANCE PUMP AND HARNESS (ORIGINAL PUMP)

REMOVE CONNECTOR X18 FROM THE PCB

Next: !p1604, !f1605

TEMPERATURE COMPARISON OF HOT WATER - EXTERNAL MIXING TEST

TURN HOT WATER TAP ON

Next: p310, !f1615

LOCKOUT RESET F61 / F62

Next: !p1621, !f1622

INLET PRESSURE

ATTACH PRESSURE GAU

Next: p1625, !f1626

AIR INTAKE CLEAR

REMOVE THE AIR INTAKE PIPE
THE AIR INTAKE IS HELD BY ONE SCREW ATTACHED TO THE HEAT EXCHANGER

Next: p1627, !f1628

CONDENSATE TRAP CLEAR

Next: p1629, !f1630

INSPECTION FLUE

Next: p1631, !f1632

INSPECTION BURNER

Next: p1633, !f1634

INSPECTION HEAT EXCHANGER FLUEWAYS

REMOVE FAN AND BURNER ASSEMBLY

Next: !p1635, !f1636

RESISTANCE OVERHEAT STAT

REMOVE THE AIR INTAK

Next: !p1661, !f1662

FAN SPEED ( PRESSURE)

ATTACH PRESSURE GAU

Next: p166, f167

RESISTANCE OVERHEAT STAT

REMOVE THE AIR INTAK

Next: !p1659, !f1660

RESISTANCE OVERHEAT STAT

REMOVE THE AIR INTAK

Next: !p1658, !f1656

INLET PRESSURE

ATTACH PRESSURE GAU

Next: p170, !f171

SPARK & FLAME SENSE ELECTRODE INSPECTION

Next: p1679, !f1678

LOCKOUT RESET F27

Next: !p1680, !f1681

VOLTAGE 24 VDC AND 5 VDC X2 REMOVED

REMOVE CONNECTOR X2 FROM THE PCB
REFIT CONNECTOR X20 TO THE PCB

Next: p1691, f1692

VOLTAGE 24VDC AND 5 VDC X2 REFITTED PRESSURE SENSOR REMOVED

REFIT CONNECTOR X2 TO THE PCB
REMOVE CONNECTOR FROM PRESSURE SENSOR AND MAKE SAFE

Next: !p1695, !f1696

INLET PRESSURE

ATTACH PRESSURE GAU

Next: p1701, !f1700

OBSERVATION SPARK QUALITY

REMOVE THE SPARK IGN

Next: p1704, f1705

PUMP LIMPET

Next: !p172, !f173

CONDENSATE TRAP CLEAR

Next: p1699, !f1703

SPARK & FLAME SENSE ELECTRODE INSPECTION

Next: p1708, !f1709

INSPECTION BURNER

Next: !p1710, !f1711

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p193, !f194

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: p1483, f917

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p1200, !f249

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p277, f274

FAN HARNESS RESISTANCE

REMOVE THE PLUG X20 FROM THE PCB AND
THE CONNECTOR FROM THE FAN

Next: p270, !f271

FAN VOLTAGE

{USEINSMAT}
DISCONNECT CONNECTOR FROM THE FAN AND MAKE SAFE

Next: p1210, !f273

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p269, f283

PRIMARY FLOW FILTER

APPLIANCE DISCHARGED AND DRAINED

Next: p311, !f312

CONDENSATE TRAP OPERATION

Next: !p313, !f314

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p321, f327

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p1609, f1616

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p367, f361

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p372, f369

CONDENSATE TRAP OPERATION

Next: !p373, !f374

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p401, f400

SYSTEM PRESSURE

Next: p489, !f490

PUMP VOLTAGE PCB

DISCONNECT CONNECTOR X18 FROM THE PCB
(PLACE IN A SAFE POSITION)

Next: !p1526, f1227

PRESSURE SENSOR VOLTAGE (PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p491, !f492

VOLTAGE PRESSURE SENSOR (OUT)

{USEINSMAT}
NO DEMAND
GAIN ACCESS TO PCB AS NECESSARY

Next: p1409, f494

AIR INTAKE CLEAR

REMOVE THE AIR INTAKE PIPE
THE AIR INTAKE IS HELD BY ONE SCREW ATTACHED TO THE HEAT EXCHANGER

Next: p1118, !f88

DHW DOES SPARKING OCCUR

REMOVE THE SPARK IGN

Next: p65, f1497

AIR INTAKE CLEAR

REMOVE THE AIR INTAKE PIPE
THE AIR INTAKE IS HELD BY ONE SCREW ATTACHED TO THE HEAT EXCHANGER

Next: p1097, !f70

RUN CH UP TO MAX TEMP DOES IT GO OVERHEAT

Next: p661, !f662

SYSTEM PRESSURE

Next: p663, !f664

PUMP LIMPET

Next: p665, !f666

RESISTANCE SENSOR TEMP PRIMARY AND HARNESS

REMOVE THE CONNECTOR X20 FROM THE PCB

Next: p667, !f668

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: p669, !f670

PUMP OVERRUN

Next: p671, !f672

RESISTANCE OVERHEAT STAT AND HARNESS AT TEMP F76

BOILER TEMPERATURE M

Next: !p673, !f674

SYSTEM PRESSURE

Next: p687, !f688

PRESSURE SENSOR VOLTAGE (PCB)

{USEINSMAT}
GAIN ACCESS TO PCB

Next: p689, !f690

VOLTAGE PRESSURE SENSOR (OUT)

{USEINSMAT}
NO DEMAND
GAIN ACCESS TO PCB AS NECESSARY

Next: p1386, f692

RESISTANCE SENSOR TEMP RETURN AND HARNESS

REMOVE CONNECTOR X20 FROM THE PCB

Next: !p735, f736

INSPECT RUBBER HOSES FLOW & RETURN

DISCHARGE THE PRIMARY WATER FROM THE BOILER

Next: !p858, !f859

System Information

Total Tests: 647

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control