XSol Diagnostic System

Interactive Test Sequence Navigator

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

4707554 BAXI DUO TEC 2 COMBI 24 GA

GLOBALLY REPLACED

Next: &473, *

NO FAULT FOUND

Next: nff

BOILER ENTERS STANDBY MODE

ENSURE THERE ARE NO DEMANDS

Next: &79, ?41, ?174, ?650

POWER UP

Next: &26, f58

DHW FLOW RATE

Next: &449, f80

FAN RUN DHW DEMAND

Next: &190, f100

BURNER IGNITES AND ESTABLISHES

Next: &247, ?191, ?193, ?195, ?197

OPERATION DHW

DHW TEMPERATURE CONTROL SET TO MAX

Next: &940, ?248, ?250, ?252, ?254, ?256

OPERATION CH

CH THERMOSTAT SET TO MAX
USER DISPLAY CONTROL SET TO HW AND CH

Next: &nff, ?349, ?351, ?353, ?355, ?357, ?359

PUMP RUNS DHW DEMAND

RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: &99, f549

CASE OFF

Next: &475, !f474

TYPE OF DIAGNOSTIC PROCEDURE

Next: &57, !f476

OVERHEAT FURTHER INVESTIGATION FROM CH

Next: &nff, f593

RESISTANCE GAS VALVE SOLENOID PILOT AND HARNESS

Next: &nff, f609

ERROR CODE 160 FAN INVESTIGATION

OUTSIDE MODEL

Next: &nff, f637

E28 FLUE SENSOR

Next: &nff, f758

E20 FLOW SENSOR

Next: &nff, f740

E40 RETURN SENSOR

Next: &nff, f746

E321 DHW SENSOR

Next: &nff, f752

FAULT CODES

Next: &nff, !f772

E117 AND E118 SYSTEM PRESSURE

Next: &nff, f869

DOES BOILER REACT AND FIRE WITH CH DEMAND

USER DISPLAY CONTROL SET TO HW AND CH

Next: &348, f941

E09 GAS VALVE CABLE

OUTSIDE MODEL

Next: &nff, f994

E384 FALSE FLAME

Next: &nff, f1043

E110_E125_E109_OVERHEAT INVESTIGATION

Next: &nff, f1047

SD SERVICE DUE

Next: &nff, !f1121

RESET GUIDE

THE ACTUAL METHOD OF

Next: &nff, !f1123

E385 LOW VOLTAGE

HEADER FOR FAULT CODE - NOT USED

Next: &nff, f1165

VOLTAGE IN

HARNESS - HIGH VOLTAGE - TIMER

Next: End

SPARKING NOT LIGHTING

CONDENSATE TRAP OR PIPEWORK

Next: End

NO PRESSURE DROP

FLUE

Next: End

NO DROP

VENTURI

Next: End

NO DROP

BURNER

Next: End

PERMANENT LIVE TO FAN

PCB

Next: End

BAFFLES OUT

BURNER

Next: End

BURNER BAFFLES

FLUE

Next: End

FAN RUNS OUTSIDE MODEL

SENSOR - THERMODISC - MINIFIT

Next: End

PREHEAT SATISFACTORY3

PCB

Next: End

PREHEAT SATISFACTORY3

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

BLR TO TEMP RADS COLD

PCB

Next: End

BLR TO TEMP RADS COLD

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

FALSE FLAME

GAS VALVE

Next: End

OH INVESTIGATION FAN RUNS DHW

THERMOSTAT 105 DEG C - LIMIT

Next: End

NO POWER TO PUMP OVERHEAT

PCB

Next: End

BOILR SHUTS DOWN PREMATURELY BOILER NOISY OH

PUMP

Next: End

OVERHEAT INVESTIGATIONOH

AIR

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER OH

Next: End

OVERHEAT INVESTIGATION OH

SENSOR - THERMODISC - MINIFIT

Next: End

OVERHEAT INVESTIGATION 3

SENSOR - THERMODISC - MINIFIT

Next: End

NO PUMP OVERRUN

PCB

Next: End

RESTRICTED

FLUE

Next: End

RESTRICTED 2

FLUE

Next: End

RESTRICTED 3

FLUE

Next: End

NO DROP

HEAT EXCHANGER FLUE WAYS

Next: End

SERVICE DUE

SERVICE DUE

Next: End

BLANK FOR BOILER RESET GUIDE

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT INVESTIGATION 2

OVERHEAT FURTHER INVESTIGATION REQUIRED

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

DIRTY CONFUSING GA SYSTEM

ELECTRODE - SENSING

Next: End

UNABLE TO CALIBRATE

GAS VALVE

Next: End

FAN RUNS DHW 1

SENSOR - THERMODISC - MINIFIT

Next: End

BAFFLES OUT

GAS VALVE

Next: End

DIRTY CONFUISING GA SYSTEM 2

ELECTRODE - SENSING

Next: End

DOES NOT IGNITE

HEAT EXCHANGER FLUE WAYS

Next: End

CALIBBRATION

SENSOR - THERMODISC - MINIFIT

Next: End

LOW VOLTAGE

Next: End

NOT CORRECTLY FITTED

KEY PCB

Next: End

SHORTED DC SIDE

FAN

Next: End

SHORTED

SENSOR HALL

Next: End

SHORTED

VALVE - SENSOR - PRESSURE

Next: End

SHORTED

HARNESS - FAN (DC)

Next: End

PRESSURE OR DHW FLOW SENSOR SECTIONS SHORTED

HARNESS - LOW VOLTAGE

Next: End

STANDBY

HARNESS - FAN (DC)

Next: End

LOW VOLTAGE SIDE SHORTED SHUTTING DOWN PCB OUTPUT 2

FAN

Next: End

FAN STANDBY 2

PCB

Next: End

LOW VOLTAGE SIDE SHORTED SHUTTING DOWN PCB OUTPUT

FAN

Next: End

FAN RUNS

THERMOSTAT 105 DEG C - LIMIT

Next: End

FAN RUNS DHW

SENSOR - NTC

Next: End

GAS VALVE VOLTAGE

PCB

Next: End

SOLENOID FAULT

GAS VALVE

Next: End

BURNER DOES NOT IGNITE

ELECTRODES SPARK AND EARTH AND GAP

Next: End

BURNER DOES NOT IGNITE

VENTURI

Next: End

BURNER DOES NOT IGNITE

FLUE

Next: End

BURNER BAFFLES OUT

CONDENSATE TRAP OR PIPEWORK

Next: End

DIES AWAY

GAS INLET PRESSURE

Next: End

BURNER BAFFLES OUT

HEAT EXCHANGER FLUE WAYS

Next: End

BURNER NON ESTABLISH

CONDENSATE TRAP OR PIPEWORK

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS INLET PRESSURE

Next: End

BURNER IGNITES

ELECTRODE - SENSING

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

BURNERIGNITES

CABLE - DETECTION - ELECTRODE

Next: End

FAN RUNS DHW

THERMOSTAT 105 DEG C - LIMIT

Next: End

NO SPARK

CABLE - ELECTRODE - IGNITION

Next: End

NO SPARK

ELECTRODE CONDITION AND SPARK GAP

Next: End

DHW KETTLING

PUMP

Next: End

DHW NOISEY KETTLING

CONDENSATE TRAP OR PIPEWORK

Next: End

BOILER KETTLING DHW OPERATION

Next: End

DHW NOISY KETTLING

PCB

Next: End

DHW NOISY KETTLING

Next: End

PREHEAT SATISFACTORY3

FLOW ASSEMBLY BRASS W/O BYPASS

Next: End

BLOCKED PREHEAT SAT3

HEAT EXCHANGER - PLATE TO PLATE

Next: End

DHW DHW COOL RADS COOL

GAS INLET PRESSURE

Next: End

DHW COOL

PUMP

Next: End

UNDER PRESSURE

VESSEL - EXPANSION

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

ANTI CYCLE DELAY

PCB

Next: End

CPERATION CH OK NO REFIRE FAN RUNS

THERMOSTAT 105 DEG C - LIMIT

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

GAS INLET PRESSURE

Next: End

BLR TO TEMP RADS NOT

FLOW ASSEMBLY BRASS W/O BYPASS

Next: End

BOILER TO TEMP RADS COOL

PUMP

Next: End

CH OPERATION

Next: End

BOILR SHUTS DOWN PREMATURELY CH OPERATION

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY

Next: End

FAN RUNS DHW

SENSOR - THERMODISC - MINIFIT

Next: End

PUMP OVERRUN

PCB

Next: End

HTG OK BUT OVERHEAT

Next: End

CASE REMOVAL

Z DIRECTION CHOICE OR CONTINUE

Next: End

FOR TYPE DIAG PROCEDURE

Z DIRECTION CHOICE OR CONTINUE

Next: End

STANDBY

THERMOSTAT 105 DEG C - LIMIT

Next: End

LOW PRESSURE WARNING

SYSTEM PRESSURE INCORRECT

Next: End

LOW PRESSURE SWITCH

PCB

Next: End

STANDBY

HARNESS - LOW VOLTAGE

Next: End

PUMP RUNS?VOLTS TO TURBINE (DHW BURNER IGN)

PCB

Next: End

PUMP RUNS HARNESS FLOW SWITCH

HARNESS - LOW VOLTAGE

Next: End

STOPS PUMP FAN RUNS DHW 1

SENSOR - THERMODISC - MINIFIT

Next: End

STOPS PUMPFAN RUNS DHW

SENSOR - THERMODISC - MINIFIT

Next: End

STOPS PUMP FAN RUNS

THERMOSTAT 105 DEG C - LIMIT

Next: End

STOPS PUMPFAN RUNS DHW

SENSOR - NTC

Next: End

BOILR SHUTS DOWN PREMATURELY BOILER NOISY

PUMP

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

FAN INVESTIGATION

PCB

Next: End

FAN INVESTIGATION 3

PCB

Next: End

FAN INVESTIGATION

FAN

Next: End

FAN INVESTIGATION 2

FAN

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE 2A MAIN PCB

Next: End

BLOWN STANDBY MODE

FUSE 2A MAIN PCB F3

Next: End

FAN RUNS

SENSOR - NTC

Next: End

STOPS PUMP FAN RUNS OUTSIDE MODEL

THERMOSTAT 105 DEG C - LIMIT

Next: End

FROST STOPS PUMP FAN RUNS DHW

SENSOR - NTC

Next: End

FROSTSTOPS PUMP FAN RUNS DHW

SENSOR - THERMODISC - MINIFIT

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS DHW OPERATION DHW TOO HOT

SENSOR - NTC

Next: End

FAN RUNS 1

SENSOR - THERMODISC - MINIFIT

Next: End

FAN RUNS

SENSOR - THERMODISC - MINIFIT

Next: End

FAN RUNS DHW OPERATION DHW COOL

SENSOR - NTC

Next: End

FAN RUNSDHW COOL

SENSOR - THERMODISC - MINIFIT

Next: End

FAN RUNS DHW COOL

SENSOR - THERMODISC - MINIFIT

Next: End

HOT THEN COLDDHW COOL

PUMP

Next: End

HOT THEN COLD FAN RUNS DHW COOL 1

SENSOR - THERMODISC - MINIFIT

Next: End

HOT THEN COLD

SENSOR - NTC

Next: End

HOT THEN COLD FAN RUNS DHW COOL

SENSOR - THERMODISC - MINIFIT

Next: End

CH OP FAN RUNS

SENSOR - THERMODISC - MINIFIT

Next: End

CH OPFAN RUNS

SENSOR - THERMODISC - MINIFIT

Next: End

BLR TEMP LOW SYSTEM LOW FAN RUNS

SENSOR - THERMODISC - MINIFIT

Next: End

BLR TEMP LOW SYSTEM LOWFAN RUNS

SENSOR - THERMODISC - MINIFIT

Next: End

POOR FLOW RATE

VALVE - COMPACT - RETURN - DHW

Next: End

RESTRICTED

BURNER

Next: End

RESTRICTED

VENTURI

Next: End

RESTICTED

CONDENSATE PIPE

Next: End

RESTRICTED

HEAT EXCHANGER PRIMARY

Next: End

RESTRICTED 2

BURNER

Next: End

RESTRICTED 2

VENTURI

Next: End

RESTICTED 2

CONDENSATE PIPE

Next: End

RESTRICTED 2

HEAT EXCHANGER PRIMARY

Next: End

LOW PRESSURE SWITCHSYSTEM PRESSURE

PCB

Next: End

STANDBYSYSTEM PRESSURE

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE

SYSTEM PRESSURE INCORRECT

Next: End

DC HARNESS

FAN

Next: End

FUSE BLOWING

MOTOR - 3 WAY VALVE

Next: End

FAN INVESTIGATION

HARNESS - FAN (DC)

Next: End

SPARK NOT LIGHT

HARNESS - GAS VALVE

Next: End

RESTRICTED 3

BURNER

Next: End

RESTRICTED 3

VENTURI

Next: End

RESTICTED 3

CONDENSATE PIPE

Next: End

RESTRICTED 3

HEAT EXCHANGER PRIMARY

Next: End

FLOW SWITCH ASSEMBLY

FLOW ASSEMBLY BRASS

Next: End

HARNESS FLOW SWITCH

HARNESS - LOW VOLTAGE

Next: End

VOLTS TO TURBINE (DHW BURNER IGN)

PCB

Next: End

FLOW SWITCH ASSEMBLY 2

FLOW ASSEMBLY BRASS

Next: End

DHW NOISY KETTLINGNO REACTION CH

PCB

Next: End

NO REACTION CH

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISE

Next: End

OVERHEAT INVESTIGATION 1

SENSOR - THERMODISC - MINIFIT

Next: End

OVERHEAT INVESTIGATION 2

SENSOR - THERMODISC - MINIFIT

Next: End

OVERHEAT INVESTIGATION

AIR

Next: End

NO RECTIFICATION VOLTAGE

HEAT EXCHANGER FLUE WAYS

Next: End

DHW COOL

HEAT EXCHANGER PRIMARY

Next: End

DHW HOT THEN COLD

HEAT EXCHANGER PRIMARY

Next: End

SERVICE VALVES FLOW AND RETURN

SERVICE VALVES FLOW AND RETURN

Next: End

E09 FAULT CODE

HARNESS - GAS VALVE

Next: End

MECHANICAL FAULT

GAS VALVE

Next: End

TOO COOL BEFORE RE FIRE

Next: End

BURNER IGNITION

FAN

Next: End

POOR DHW

MOTOR - 3 WAY VALVE

Next: End

BLR TO TEMP RADS NOT

MOTOR - 3 WAY VALVE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY

PCB

Next: End

FALSE FLAME

PCB

Next: End

OVERHEAT INVESTIGATION

PCB

Next: End

OH INVESTIGATIONNO SPARK

HARNESS - SAFETY VALVE

Next: End

OVERHEAT

PUMP

Next: End

OVERHEAT

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

OVERHEAT INVESTIGATIONOH

HARNESS - LOW VOLTAGE

Next: End

OVERHEAT INVESTIGATION2OH

HARNESS - LOW VOLTAGE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY OH

PCB

Next: End

MECHANICAL OPERATION

FAN

Next: End

MECHANICAL OPERATION 2

FAN

Next: End

MECHANICAL OPERATION 3

FAN

Next: End

NO DROP

FAN

Next: End

OVERHEAT INVESTIGATION

OVERHEAT FURTHER INVESTIGATION REQUIRED

Next: End

SENSOR PRIMARY FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

NOT IGNITING

RE CALIBRATION

Next: End

BAFFLING

RE CALIBRATION

Next: End

E20 FAULT CODE

HARNESS - LOW VOLTAGE

Next: End

E40 FAULT CODE

HARNESS - LOW VOLTAGE

Next: End

SHOWING E385 INCORRECTLY

PCB

Next: End

OPEN CIRCUIT

HARNESS SUPPLY TO PCB

Next: End

LED AT POWER UP

PCB

Next: End

FAN INVESTIGATION 2 2

PCB

Next: End

STANDBY

FAN

Next: End

FAN INVESTIGATION 2

PCB

Next: End

FLUE SENSOR FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

FAN DOES NOT RUN DHW

PCB

Next: End

FAN RUNS 1

HARNESS - NTC/EXTERNAL SENSOR

Next: End

FLAME SENSE

PCB

Next: End

NO SPARK

PCB

Next: End

DHW NOISY KETTLING

HEAT EXCHANGER - PLATE TO PLATE

Next: End

DHW NOISY KETTLING

HEAT EXCHANGER PRIMARY

Next: End

EXTERNAL CONTROL DHW NOISY KETTLING

HARNESS - HIGH VOLTAGE - TIMER

Next: End

LETBY PREHEAT3

FLOW ASSEMBLY BRASS W/O BYPASS

Next: End

WATER TOO HOTDHW COOL

PCB

Next: End

WATER TOO HOT

PCB

Next: End

EXPANSION CONNECTION

PIPE - VESSEL - EXPANSION

Next: End

OPERATION CH OPERATION OK GOES TO OVER HEAT

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLR LOW SYSTEM LOW

PCB

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

CH OPERATION NOISY

HEAT EXCHANGER PRIMARY

Next: End

CH OPERATION NOISEY

Next: End

SENSOR TEMP RETURN FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

STANDBY

PCB

Next: End

CH DEMAND SPARKING DOES NOT OCCUR

PUMP

Next: End

PUMP TO PCB

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

STANDBY MODE

VALVE - SENSOR - PRESSURE

Next: End

STOPS PUMP SENSOR PRIMARY FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

STOPS PUMP SENSOR TEMP RETURN FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

STOPS PUMP FLUE SENSOR FAN RUNS

HARNESS - LOW VOLTAGE

Next: End

STOPS PUMP FAN RUNS

HARNESS - NTC/EXTERNAL SENSOR

Next: End

PUMP SU FAN RUNS SPARKING DOES NOT OCCUR

PCB

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION FUSE F1 MAIN SOLENOID

HARNESS - GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN INVESTIGATION 4

PCB

Next: End

FROST PROTECTION

FROST PROTECTION

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

FROST

Next: End

FURTHER IN VESTIGATION F3

Z DIRECTION CHOICE OR CONTINUE

Next: End

HW+CHFROST STANDBY MODE

PCB

Next: End

FLOW SENSOR OUTSIDE MODEL

PCB

Next: End

RETURN SENSOR OUTSIDE MODEL

PCB

Next: End

DHW SENSOR OUTSIDE MODEL

PCB

Next: End

FAN RUNS

HARNESS - NTC/EXTERNAL SENSOR

Next: End

STOPS PUMP FLUE SENSOR FAN RUNS OUTSIDE MODEL

HARNESS - LOW VOLTAGE

Next: End

FLUE SENSOR OUTSIDE MODEL

PCB

Next: End

GAS RATE

GAS VALVE

Next: End

RESTRICTED

CONDENSATE TRAP OR PIPEWORK

Next: End

PUMP RUNS

DHW INLET FILTER

Next: End

GAS RATE LOW

GAS VALVE

Next: End

RESTRICTED 2

CONDENSATE TRAP OR PIPEWORK

Next: End

PRESSURE FAULT CODE

PCB

Next: End

PUMP RUNS

DHW FLOW FLOAT

Next: End

STANDBY MODE SYSTEM PRESSURE

VALVE - SENSOR - PRESSURE

Next: End

FUSE BLOWING

PCB

Next: End

DIVERTER VALVE

HARNESS - 3 WAY VALVE - PUMP - FAN

Next: End

FUSE INVESTIGATION

HARNESS - FAN (DC)

Next: End

POOR FLOW RATE

HEAT EXCHANGER - PLATE TO PLATE

Next: End

NO SPARK

HARNESS - SAFETY VALVE

Next: End

NOISY CH

GAS VALVE

Next: End

RESTRICTED 3

CONDENSATE TRAP OR PIPEWORK

Next: End

VOLTAGE IN

PCB

Next: End

PUMP RUNS?FAN DOES NOT RUN

SENSOR HALL

Next: End

FAN DOES NOT RUN

SENSOR HALL

Next: End

NO REACTION CH

HARNESS - HIGH VOLTAGE - TIMER

Next: End

OVERHEAT INVESTIGATION

HARNESS - LOW VOLTAGE

Next: End

OVERHEAT INVESTIGATION2

HARNESS - LOW VOLTAGE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

DHW COOL

HEAT EXCHANGER - PLATE TO PLATE

Next: End

BOILER CYCLING OPERATION DHW DHW RUNS HOT THEN COLD

PCB

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

HEAT EXCHANGER - PLATE TO PLATE

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

GAS VALVE HARNESS

PCB

Next: End

VOLTAGE IN 2

PCB

Next: End

FAN RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p1182

NO SPARK

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p192

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p194

BURNER IGNITES BUT BAFFLES OUT OR DIES AWAY

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p196

SPARKING OCCURS BUT BURNER DOES NOT LIGHT

CHARACTERISTIC TEST FROM BURNER IGNITES AND ESTABLISHES

Next: p198

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p249

DHW COOL RADS COLD NO HEAT DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p251

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p253

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p255

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p787

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p283

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p285

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p350

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p352

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p354

OPERATION SATISFACTORY BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p463

OPERATES CORRECTLY BUT SYSTEM GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p358

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p360

PUMP RUNS CONTINUALLY

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p42

TEMP DIFF CORRECT LOCAL BOILING

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p424

DIFFERENTIAL OK

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN (P=DIF NOK NOISY NSD)

Next: !p426

BOILER FIRES WITH NO DEMAND

CHARACTERISTIC TEST FROM BOILER ENTERS STANDBY MODE

Next: p651

FLOAT DAMAGED,RESTRICTED OR JAMMED

CHARACTERISTIC TEST FROM FLOW SWITCH ASSEMBLY

Next: !p88

FLOW SWITCH ASSEMBLY CLEAR

CHARACTERISTIC TEST FROM FLOW SWITCH ASSEMBLY

Next: !p90

30/06/2021 14:52:52 2107_1_50_1 31/08/2021 11:18:14

29/07/2021 09:48:48

Next: End

VOLTAGE PERMANENT TO FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p101, !f102

INSPECTION CONDENSATE TRAP

Next: p1004, !f1005

VOLTAGE DIVERTER VALVE PCB (DHW)

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1031, !f1030

VOLTAGE DIVERTER VALVE PCB CH

USER DISPLAY CONTROL SET TO HW AND CH
REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1037, !f1036

VOLTAGE DEMAND FROM FLOW SENSOR

REMOVE CONTROL BOX COVER IF NECESSARY
RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: p105, f133

PRESSURE STANDING_RETURN

ATTACH U GAUGE TO INLET TEST POINT
USER DISPLAY CONTROL SET TO HW MODE ONLY

Next: !p1044, !f1045

OBSERVATION RESET BOILER

ALLOW THE APPLIANCE TO COOL

Next: p1083, f1048

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR X37 FROM ON THE PCB

Next: !p1049, f1051

RESISTANCE SENSOR OVERHEAT STAT NO SPARK

DISCONNECT THE BLUE WIRES FROM THE OVERHEAT

Next: !p1052, !f1053

PUMP RUNS

Next: p1064, f1058

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP
RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: !p1059, f1060

VOLTAGE PUMP AT PCB

RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: !p1061, !f1062

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p1073, !f1074

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p1077, !f1078

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p113, !f114

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p461, !f462

SOCKET AND SEE CHECK (LOW VOLTAGE)

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p1166, !f1167

VOLTAGE DC TO FAN (FAN DISCONNECTED)

REMOVE 4 WIRE CONNECTOR FROM FAN AND MAKE SAFE

Next: !p1187, !f1188

VOLTAGE DC TO FAN (FAN DISCONNECTED)

REMOVE 4 WIRE CONNECTOR FROM FAN AND MAKE SAFE

Next: !p1192, !f1193

RESISTANCE HEAT EX OVERHEAT SENSOR

DISCONNECT THE WIRING FROM THE FLUE OVERHEAT STAT

Next: !p121, !f122

VOLTAGE TO FLOW SENSOR

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p933, !f937

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: !p172, !f173

VOLTAGES DC TO GAS VALVE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p201, !f202

ELECTRODE SENSE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p231, !f232

RESISTANCE SENSOR OVERHEAT STAT NO SPARK

DISCONNECT THE BLUE WIRES FROM THE OVERHEAT

Next: !p901, !f242

VOLTAGE EXTERNAL CONTROLS (IN)

USER DISPLAY CONTROL TO HW AND CH
REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p927, !f293

VOLTAGE PUMP AT PUMP

REMOVE THE COVER FROM THE PUMP
RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: !p550, f551

VOLTAGE PUMP AT PCB

RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: !p552, f554

SYSTEM PRESSURE CORRECT

Next: p555, !f556

VOLTAGE TO LOW PRESSURE SWITCH

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p559, !f560

VOLTAGE TO FLOW SENSOR

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p565, !f566

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p571, !f572

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p575, !f576

RESISTANCE HEAT EX OVERHEAT SENSOR

DISCONNECT THE WIRING FROM THE FLUE OVERHEAT STAT

Next: !p579, !f580

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p59, f60

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: !p583, !f584

PUMP LIMPET TEST

Next: p961, !f595

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM HOLDER

Next: !p61, f62

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT CONNECTOR MARKED X36

Next: p611, f612

RESISTANCE GAS VALVE SOLENOID MAIN

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p613, !f614

RESISTANCE PUMP

REMOVE THE COVER FROM THE PUMP AND DISCONNECT THE
LEAD FROM THE PUMP HOUSING

Next: !p617, !f618

FUSE FURTHER INVESTIGATION F1

Next: !p63, !f64

RESISTANCE FAN HARNESS

DISCONNECT THE 4 WAY CONNECTOR FROM THE PCB AND FAN

Next: p638, !f898

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE FUSE FROM HOLDER AND CONNECTOR BLOCK

Next: p67, f68

FUSE FURTHER INVESTIGATION F2

Next: !p69, !f70

EXTERNAL CONTROLS CALLING

ENSURE THERE ARE NO

Next: !p719, f720

FUSE FURTHER INVESTIGATION F3

Next: !p73, !f74

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: p721, !f768

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: !p741, f742

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p1162, !f1161

RESISTANCE SENSOR TEMP RETURN AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: !p747, f748

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p1163, !f1026

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X20 ON THE PCB

Next: !p753, f754

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: !p755, !f756

RESISTANCE HEAT EX OVERHEAT AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: !p765, f762

RESISTANCE HEAT EX OVERHEAT SENSOR

DISCONNECT THE WIRING FROM THE FLUE OVERHEAT STAT

Next: !p763, !f764

INSPECTION SERVICE VALVE DHW

Next: p81, !f82

PRESSURE FAN

ATTACH U GAUGE TO GAS VALVE OUTLET TEST POINT
REMOVE 4 WIRE HARNESS FROM FAN

Next: !p821, f822

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p823, !f824

INSPECTION CONDENSATE PIPE

Next: !p829, !f830

PRESSURE FAN

ATTACH U GAUGE TO GAS VALVE OUTLET TEST POINT
REMOVE 4 WIRE HARNESS FROM FAN

Next: !p836, f837

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p838, !f839

INSPECTION CONDENSATE PIPE

Next: !p844, !f845

SYSTEM PRESSURE CORRECT

Next: p878, !f885

VOLTAGE TO LOW PRESSURE SWITCH

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p881, !f882

RESISTANCE FAN (DC)

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN

Next: !p899, !f892

RESISTANCE DIVERTER VALVE HEAD

REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p895, !f896

PRESSURE FAN

ATTACH U GAUGE TO GAS VALVE OUTLET TEST POINT
REMOVE 4 WIRE HARNESS FROM FAN

Next: !p904, f905

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p906, !f907

INSPECTION CONDENSATE PIPE

Next: !p912, !f913

VOLTAGE EXTERNAL CONTROLS (OUT PCB)

REMOVE CONTROLS COVER AS NECESSARY
USER DISPLAY CONTROL TO CH AND HW

Next: p942, !f943

VOLTAGE EXTERNAL CONTROLS (IN)

USER DISPLAY CONTROL TO HW AND CH
REMOVE CONTROL BOX COVER IF NECESSARY

Next: p998, !f947

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p967, !f968

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p971, !f972

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EX_CH

USER DISPLAY CONTROL SET TO DHW AND CH
ATTACH TEMPERATURE PROBES AS INDICATED BY THE RED ARROWS

Next: !p982, !f983

TEMPERATURE DIFFERENTIAL PRIMARY HEAT EX_CH

USER DISPLAY CONTROL SET TO DHW AND CH
ATTACH TEMPERATURE PROBES AS INDICATED BY THE RED ARROWS

Next: !p986, !f989

RESISTANCE GAS VALVE HARNESS

DISCONNECT THE 4 WAY CONNECTOR ( X36) FROM THE PCB
ALSO DISCONNECT THE LEAD FROM THE GAS VALVE

Next: !p995, !f997

PRESSURE FAN

ATTACH U GAUGE TO GAS VALVE OUTLET TEST POINT
REMOVE 4 WIRE HARNESS FROM FAN

Next: !p1002, f1003

INSPECTION FLUE

Next: p1013, !f1007

VOLTAGE FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p103, f104

INSPECTION AIR INTAKE

Next: p1014, !f1015

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1116, !f1016

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1022, !f1021

INSPECTION FLUE

Next: p1140, !f1024

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT X13 FROM THE PCB
DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p1032, !f1033

RESISTANCE DIVERTER VALVE HARNESS

DISCONNECT X13 FROM THE PCB
DISCONNECT THE LEAD FROM THE DIVERTER VALVE MOTOR

Next: !p1038, !f1039

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p111, f112

RESISTANCE OVERHEAT STAT AT TEMP 2

Next: !p1124, f1057

PUMP LIMPET TEST

Next: p1065, !f1066

INSPECTION AIR IN SYSTEM AND BOILER

ENSURE BOILER SYSTEM PRESSURE IS CORRECT
ENSURE AUTO AIR VENT CAP IS OPEN

Next: p1067, !f1068

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p1069, !f1070

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p1071, f1072

RESISTANCE SENSOR TEMP RETURN AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p1079, f1076

OBSERVATION PUMP OVERRUN

USER DISPLAY CONTROL SET TO HW AND CH

Next: !p1080, !f1081

OBSERVATION DOES E110 RE APPEAR

DHW TEMPERATURE SET TO MAX
CH TEMPERATURE SET TO MAX

Next: p1054, !f1125

RESISTANCE SENSOR TEMP RETURN AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p115, f116

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: !p1117, !f1118

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p1155, !f1128

CF MINI CALIBRATION FUNCTION

Next: !p1138, !f1139

ELECTRODE SENSE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p213, !f1137

CF MINI CALIBRATION FUNCTION

Next: !p1143, !f1142

ELECTRODE SENSE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p221, !f1154

RESISTANCE HEAT EX OVERHEAT AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p169, f120

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT

Next: p1127, !f1159

INSPECTION KEY PCB

Next: p1170, !f1171

OBSERVATION DISPLAY OPERATES WITH FAN DISCONNECTED

REMOVE THE 4 WIRE CONNECTOR FROM THE FAN AND MAKE SAFE

Next: p1172, !f1173

OBSERVATION DISPLAY OPERATES WITH DHW FLOW SENSOR DISCONNECTED

REMOVE THE CONNECTOR FOR THE DHW FLOW SENSOR AND MAKE SAFE

Next: p1174, !f1175

OBSERVATION DISPLAY OPERATES WITH PRESSURE SENSOR DISCONNECTED

REMOVE THE CONNECTOR FROM THE PRESSURE SENSOR AND MAKE SAFE

Next: p1176, !f1177

OBSERVATION DISPLAY OPERATES WITH X23 DISCONNECTED

REMOVE CONNECTOR X23 FROM THE PCB AND MAKE SAFE

Next: p1178, !f1179

OBSERVATION DISPLAY OPERATES WITH X22 DISCONECTED

REMOVE CONNECTOR X22 FROM THE PCB AND MAKE SAFE

Next: !p1180, !f1181

RESISTANCE FAN HARNESS

DISCONNECT THE 4 WAY CONNECTOR FROM THE PCB AND FAN

Next: p1183, !f1184

VOLTAGE DC TO FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1185, f1186

VOLTAGES DC FROM FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p1189, !f1190

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X20 ON THE PCB

Next: !p170, f171

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR X37 FROM ON THE PCB

Next: p239, f240

INSPECTION CONDENSATE TRAP

Next: p225, !f226

INSPECTION CONDENSATE TRAP

Next: p219, !f220

INLET PRESSURE DROP

ATTACH PRESSURE GAU

Next: p199, f200

ELECTRODES SPARK

Next: p1129, !f214

RESISTANCE GAS VALVE

DISCONNECT THE LEAD FROM THE GAS VALVE

Next: p203, !f204

RESISTANCE GAS VALVE HARNESS

DISCONNECT THE 4 WAY CONNECTOR ( X36) FROM THE PCB
ALSO DISCONNECT THE LEAD FROM THE GAS VALVE

Next: p1001, !f900

FAN ASSEMBLY AIR INTAKE

Next: p215, !f216

INSPECTION FLUE

Next: p1126, !f218

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p1144, !f222

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT

Next: p1019, !f224

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p227, !f228

VOLTAGE RECTIFICATION

DISCONNECT FLAME SEN

Next: p229, f230

RESISTANCE ELECTRODE SENSE HARNESS

REMOVE LEAD FROM ELECTRODE AND PCB

Next: !p237, !f238

INSPECTION BURNER

REMOVE THE FRONT OF THE COMBUSTION CHAMBER

Next: p978, !f234

RESISTANCE CHECK IGNITION LEAD

REMOVE THE SPARK LEAD FROM THE SPARK ELECTRODE AND PCB

Next: p243, !f244

ELECTRODE CONDITION AND SPARK GAP

Next: !p245, !f246

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: p336, !f778

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p304, !f305

INSPECTION DIVERTER VALVE DHW POSITION

REMOVE DIVERTER VALVE MOTOR FROM THE BODY

Next: p294, f1028

PUMP LIMPET TEST

Next: p276, !f277

INSPECTION CONDENSATE TRAP

Next: p278, !f279

CH OPERATION

FLOW AND RETURN VALV

Next: !p280, ?282, ?284

VOLTAGE EXTERNAL CONTROLS (OUT PCB)

REMOVE CONTROLS COVER AS NECESSARY
USER DISPLAY CONTROL TO CH AND HW

Next: p288, !f289

INSPECTION EXTERNAL BYPASS SYSTEM

Next: !p286, !f287

VOLTAGE EXTERNAL CONTROLS (OUT)

REMOVE CONTROLS COVER AS NECESSARY
USER DISPLAY CONTROL SET TO HW AND CH

Next: !p290, f291

INSPECTION DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p300, !f301

DIFFERENTIAL PLATE HEAT EX

USER CONTROL SETTING

Next: !p302, !f303

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: p306, !f784

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR.

Next: p310, !f785

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: p314, !f786

PUMP LIMPET TEST

Next: p318, !f319

GAS RATE

Next: p320, f820

DIFFERENTIAL PLATE HEAT EX

USER CONTROL SETTING

Next: !p334, f981

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR.

Next: p340, !f779

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p344, !f780

PUMP LIMPET TEST

Next: p407, !f408

INSPECTION DIVERTER VALVE CH POSITION

REMOVE DIVERTER VALVE MOTOR FROM DIVERTER BODY

Next: p395, f1034

GAS INLET PRESSURE

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p371, !f372

RESISTANCE OVERHEAT STAT AT TEMP

Next: !p369, !f370

VOLTAGE BOILER SWITCHED LIVE OPERATION REFIRE

ENSURE EXTERNAL TIME

Next: p363, !f364

EXPANSION VESSEL PRESSURE

SYSTEM DISCHARGED

Next: !p361, !f362

OBSERVATION ANTI CYCLE DELAY

ALLOW THE HEATING SY

Next: !p1018, !f366

GAS RATE

Next: p373, f835

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR.

Next: p387, !f816

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: !p391, !f817

INSPECTION DIVERTER SPINDLE CH

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p401, !f402

PUMP LIMPET TEST

Next: p403, !f404

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p990, !f406

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p409, !f410

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR.

Next: p411, !f812

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: p415, !f813

GAS RATE

Next: p419, f903

TEMPERATURE DIFFERENTIAL FLOW RETURN FROM BOILER

ATTACH TEMPERATURE PROBES AS INDICATED BY THE RED ARROWS

Next: !p421, ?423, ?425

RESISTANCE OVERHEAT STAT

DISCONNECT THE CONNECTOR FROM THE PCB
ENSURE THE APPLIANCE IS NOT TOO HOT

Next: !p47, !f48

OBSERVATION PUMP OVERRUN

USER DISPLAY CONTROL SET TO HW AND CH

Next: p468, !f467

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p356, !f472

VOLTAGE LOW PRESSURE SWITCH

ENSURE SYSTEM PRESSURE IS SET BETWEEN 0.6 AND 1.5BAR
REMOVE CONTROL BOX COVER IF NECESSARY

Next: p557, f558

VOLTAGE DEMAND FROM FLOW SENSOR

REMOVE CONTROL BOX COVER IF NECESSARY
RUN HOT WATER TAP AT FLOW RATE OF 3 L/MIN

Next: p563, f564

RESISTANCE LOW PRESSURE SWITCH HARNESS

REMOVE THE CONNECTOR X22 FROM THE PCB AND THE LOW PRESSURE SWITCH.

Next: !p561, !f562

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p569, f570

RESISTANCE HARNESS FLOW SENSOR

DISCONNECT TERMINAL X22 FROM THE PCB AND THE LEAD FROM THE HALL SENSOR

Next: p929, !f568

RESISTANCE SENSOR TEMP RETURN AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p573, f574

RESISTANCE HEAT EX OVERHEAT AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p577, f578

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X20 ON THE PCB

Next: !p586, f582

VOLTAGE MAINS POWER INPUT TO PCB

Next: p1169, f66

RESISTANCE PUMP AND HARNESS

REMOVE CONNECTORS X13 AND X11 FROM THE PCB

Next: p888, f616

VOLTAGE PERMANENT TO FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p640, !f641

VOLTAGE DC TO FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p642, f1191

VOLTAGE FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p644, !f645

FAN RUNNING

Next: p646, !f647

VOLTAGES DC FROM FAN

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p648, !f649

IS BOILER TEMP LOW

Next: !p673, f718

RESISTANCE FUSE F3 ( APPLIANCE)

REMOVE FUSE FROM HOLDER AND THE CONNECTOR BLOCK.

Next: !p1168, f72

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR

Next: !p732, !f769

RESISTANCE SENSOR TEMP DHW

REMOVE THE GREEN LEADS FROM DHW SENSOR

Next: p788, !f808

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RED LEADS) FROM PRIMARY SENSOR.

Next: p792, !f807

RESISTANCE SENSOR TEMP RETURN

REMOVE THE TWO LEADS (BLUE) FROM THE RETURN SENSOR

Next: p796, !f809

PUMP LIMPET TEST

Next: p800, !f801

DIFFERENTIAL PLATE HEAT EX

USER CONTROL SETTING

Next: !p984, f985

FLOW SWITCH ASSEMBLY

DHW DISCHARGED AND D

Next: !p83, ?87, ?89

INSPECTION AIR INTAKE

Next: p825, !f826

INSPECTION CONDENSATE TRAP

Next: p827, f828

INSPECTION FLUE

Next: p831, !f1110

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: !p1111, !f834

INSPECTION AIR INTAKE

Next: p840, !f841

INSPECTION CONDENSATE TRAP

Next: p842, f843

INSPECTION FLUE

Next: p846, !f1112

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: !p1113, !f849

VOLTAGE LOW PRESSURE SWITCH

ENSURE SYSTEM PRESSURE IS SET BETWEEN 0.6 AND 1.5BAR
REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p879, f880

RESISTANCE LOW PRESSURE SWITCH HARNESS

REMOVE THE CONNECTOR X22 FROM THE PCB AND THE LOW PRESSURE SWITCH.

Next: !p883, !f884

RESISTANCE FAN AND HARNESS (DC)

DISCONNECT CONNECTOR X23 FROM THE PCB

Next: p889, f890

RESISTANCE DIVERTER VALVE AND HARNESS

REMOVE CONNECTOR X13 FROM THE PCB
REMOVE DIVERTER VALVE HEAD FROM BODY

Next: !p893, f894

INSPECTION AIR INTAKE

Next: p908, !f909

INSPECTION CONDENSATE TRAP

Next: p910, f911

INSPECTION FLUE

Next: p914, !f1114

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

Next: !p1115, !f917

INSPECTION FLOW ASSEMBLY

ISOLATE MAINS WATER
DRAIN DOMESTIC WATER CIRCUITS

Next: !p930, !f931

RESISTANCE HARNESS FLOW SENSOR

DISCONNECT TERMINAL X22 FROM THE PCB AND THE LEAD FROM THE HALL SENSOR

Next: p936, !f935

INSPECTION FLOW ASSEMBLY

ISOLATE MAINS WATER
DRAIN DOMESTIC WATER CIRCUITS

Next: !p938, !f939

VOLTAGE EXTERNAL CONTROLS (OUT)

REMOVE CONTROLS COVER AS NECESSARY
USER DISPLAY CONTROL SET TO HW AND CH

Next: !p944, f945

INSPECTION AIR IN SYSTEM AND BOILER

ENSURE BOILER SYSTEM PRESSURE IS CORRECT
ENSURE AUTO AIR VENT CAP IS OPEN

Next: p962, !f977

INSPECTION EXTERNAL BYPASS SYSTEM

Next: p963, !f964

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: p965, f966

RESISTANCE SENSOR TEMP RETURN AND HARNESS

DISCONNECT CONNECTOR FROM X22 ON THE PCB

Next: !p1041, f970

HEAT EXCHANGER FLUE WAYS

REMOVE THE COMBUSTION CHAMBER FRONT

Next: !p979, !f980

INSPECTION FLOW AND RETURN VALVES

Next: !p992, !f991

VOLTAGE EXTERNAL CONTROLS IN PCB

REMOVE CONTROLS COVER AS NECESSARY
USER DISPLAY CONTROL SET TO HW AND CH

Next: !p999, !f1000

System Information

  • Total Tests: 540
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control