XSol Diagnostic System

WORCESTER 280 RSF.

G.C. NUMBER 47 311 1

Next: &20, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

HW TAP TURN OFF

OPERATING SWITCH IN WATER POSITION

Next: &nff, !f116

HOT WATER

Next: &1, ?112, ?114

HW BURNER MODULATION

OPERATING SWITCH IN

Next: &2, f109

HW HIGH FLAME

OPERATING SWITCH IN

Next: &3, f231

HW PILOT IGNITES

OPERATING SWITCH IN WATER POSITION

Next: &4, f104

HW DEMAND INDICATOR

OPERATING SWITCH IN WATER POSITION

Next: &5, f101

PUMP OVERRUN

OPERATING SWITCH IN WATER POSITION
TEMPERATURE CONTROL TO MAX

Next: &6, f382

CENTRAL HEATING

Next: &7, ?97, ?99

CH BURNER MODULATION

OPERATING SWITCH IN

Next: &8, f202

CH HIGH FLAME

OPERATING SWITCH IN

Next: &191, f296

CH LOW FLAME

OPERATING SWITCH IN HEATING & WATER POSITION

Next: &250, f73

WATER PUMP RUNNING

OPERATING SWITCH IN

Next: &131, f39

DIVERTER VALVE ARM CH

OPERATING SWITCH IN HEATING & WATER POSITION.

Next: &14, f34

CH DEMAND INDICATOR

OPERATING SWITCH IN HEATING & WATER POSITION.

Next: &15, f29

POWER ON INDICATOR

Next: &16, f24

FROST THERMOSTAT STATE

{GAINPCBACS}

Next: &17, !f23

SYSTEM CHECKS

PLEASE ENSURE THAT THE FOLLOWING SYSTEM CHECKS ARE COMPLETED.

Next: &18, !f22

WORCESTER 280 RSF.

G.C. NUMBER 47 311 1

Next: &19, !f21

CH PILOT IGNITES

OPERATING SWITCH IN HEATING & WATER POSITION

Next: &12, ?330, ?332

INTERNAL FROST THERMOSTAT

Next: &9, f192

CH LOW FLAME CORRECT PRESSURE

ATTACH U GAUGE TO BURNER PRESSURE TEST POINT
REMOVE THE ONE LEAD FROM THE MODULATING COIL

Next: &10, !f251

FUSE INVESTIGATION TREE

OUTSIDE MODEL

Next: &nff, f321

HW PILOT IGNITES

HOT WATER TEMPERATURE SENSOR (THERMISTOR)

Next: End

HOT WATER TEMPERATURE SENSOR FIXING

Next: End

HW TAP TURN OFF

WATER FLOW SWITCH (PROXIMITY SWITCH)

Next: End

HOT WATER TEMPERATURE SENSOR (THERMISTOR)

Next: End

CH SENSOR

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

CENTRAL HEATING TEMPERATURE SENSOR FIXING

Next: End

CH MODULATION

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

TEMPERATURE CONTROL POTENTIOMETER

Next: End

ELECTRICAL SAFETY CHECK

Next: End

SYSTEM CHECKS

Next: End

FROST THERMOSTAT (OPTIONAL)

Next: End

HW HIGH FLAME

HOT WATER TEMPERATURE SENSOR (THERMISTOR)

Next: End

HW

GAS INLET PRESSURE

Next: End

HW HIGH FLAME

MAIN DRIVER BOARD

Next: End

LOW FLAME CORRECT PRESSURE

MODUREG PRESSURE REDUCING VALVE

Next: End

DIVERTER VALVE

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

DIVERTER VALVE

HOT WATER TEMPERATURE SENSOR (THERMISTOR)

Next: End

PUMP

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

PUMP

HOT WATER TEMPERATURE SENSOR (THERMISTOR)

Next: End

GAS INLET PRESSURE

Next: End

CH HIGH FLAME

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

MODUREG VOLTAGE CH

TEMPERATURE CONTROL POTENTIOMETER

Next: End

POWER ON INDICATOR

STANDBY INDICATOR NEON (AMBER)

Next: End

CH DEMAND INDICATOR

DEMAND INDICATOR NEON (GREEN)

Next: End

FUSE F1

Next: End

POWER ON INDICATOR

MAINS FUSE

Next: End

OPERATING SWITCH

OPERATING SWITCH / PROGRAMMER

Next: End

FUSE INVESTIGATION

WATER PUMP

Next: End

FUSE INVESTIGATION

FAN ASSEMBLY

Next: End

FUSE INVESTIGATION

WATER DIVERTER VALVE

Next: End

FUSE INVESTIGATION

MAIN GAS VALVE

Next: End

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

AIR PRESSURE SWITCH: NO AIR

AIR PRESSURE SWITCH

Next: End

AIR PRESSURE SWITCH:NO AIR

IGNITION CONTROL BOARD

Next: End

FLUE ASSEMBLY

Next: End

AIR PRESSURE SWITCH TUBES

Next: End

PILOT NOT IGNITE

FAN ASSEMBLY

Next: End

PILOT

GAS INLET PRESSURE

Next: End

HW DEMAND INDICATOR

WATER SUPPLY

Next: End

HW DEMAND INDICATOR

FILTER - GAUZE

Next: End

HW DEMAND INDICATOR

ISOLATING VALVE (DHW)

Next: End

HW DEMAND INDICATOR

FLOW REGULATOR

Next: End

PUMP OVERRUN

CENTRAL HEATING TEMPERATURE SENSOR (THERMISTOR)

Next: End

DIVERTER VALVE ARM CH

WATER FLOW SWITCH STUCK

Next: End

CH PILOT IGNITES

ELECTRODE LEAD (SPARK)

Next: End

CH PILOT IGNITES

ELECTRODE (PILOT SPARK)

Next: End

PILOT VOLTAGE

IGNITION CONTROL BOARD

Next: End

CH PILOT IGNITES

PILOT INJECTOR

Next: End

ELECTRODE (FLAME SENSE)

Next: End

MAIN GAS VALVE

Next: End

ELECTRODE LEAD (FLAME SENSE)

Next: End

SYSTEM FAULT

Next: End

FLOW SWITCH HW DEMAND

OPERATING SWITCH / PROGRAMMER

Next: End

HW SENSOR

MAIN DRIVER BOARD

Next: End

SECONDARY HEAT EXCHANGER (WATER TO WATER)

Next: End

DIVERTER VALVE ARM CH

WATER DIVERTER VALVE

Next: End

HOT WATER

WATER DIVERTER VALVE

Next: End

HW SENSOR 2

MAIN DRIVER BOARD

Next: End

CH SENSOR

MAIN DRIVER BOARD

Next: End

CH MODULATION

MAIN DRIVER BOARD

Next: End

HW HIGH FLAME

MODUREG PRESSURE REDUCING VALVE

Next: End

WATER PUMP VOLTAGE

MAIN DRIVER BOARD

Next: End

MODUREG PRESSURE REDUCING VALVE

Next: End

CH SENSOR 2

MAIN DRIVER BOARD

Next: End

FAULTY POWER NEON

Z REDIRECT

Next: End

FAULTY DEMAND NEON

Z REDIRECT

Next: End

FUSE INVESTIGATION F1

Z REDIRECT

Next: End

MAINS ELECTRICITY SUPPLY

Next: End

MAINS FUSE

Z REDIRECT

Next: End

NO FAULT FUSE INVESTIGATION

FUSE FURTHER INVESTIGATION

Next: End

ROOM THERMOSTAT

Next: End

CH PILOT PASSING

MAIN GAS VALVE

Next: End

OVERHEAT THERMOSTAT

Next: End

PUMP OVERRUN

MAIN DRIVER BOARD

Next: End

FAN ASSEMBLY

Next: End

FLUE

AIR PRESSURE SWITCH

Next: End

WATER FLOW SWITCH (PROXIMITY SWITCH)

Next: End

HW DEMAND INDICATOR

SECONDARY HEAT EXCHANGER (WATER TO WATER)

Next: End

PUMP OVERRUN PRIMARY TEST

MAIN DRIVER BOARD

Next: End

WATER PUMP VOLTAGE 1

MAIN DRIVER BOARD

Next: End

SPARK GENERATOR

IGNITION CONTROL BOARD

Next: End

CH PILOT IGNITES

PILOT VALVE (MAIN GAS VALVE)

Next: End

WATER PUMP

Next: End

SENSE ELECTRODE

IGNITION CONTROL BOARD

Next: End

MAIN BURNER

Next: End

PRIMARY HEAT EXANGER (GAS TO WATER)

PRIMARY HEAT EXCHANGER (GAS TO WATER)

Next: End

HOT WATER UNSATISFACTORY RADIATORS REMAIN COLD

CHARACTERISTIC TEST FROM HOT WATER

Next: !p113

HOW WATER UNSATISFACTORY RADIATORS GET WARM

CHARACTERISTIC TEST FROM HOT WATER

Next: !p129

PILOT PERMANENTLY LIT

CHARACTERISTIC TEST FROM CH PILOT IGNITES

Next: !p331

PILOT DOES NOT LIGHT

CHARACTERISTIC TEST FROM CH PILOT IGNITES

Next: p334

HEAT EXCHANGER NOISY

CHARACTERISTIC TEST FROM CENTRAL HEATING

Next: !p98

HEAT EXCHANGER QUIET

CHARACTERISTIC TEST FROM CENTRAL HEATING

Next: !p100

24/08/2018 13:36:07 1808_1_50_1 20/09/2018 10:51:17

24/08/2018 14:06:10

Next: End

FLOW SWITCH HW DEMAND

REMOVE PLUG X1 FROM PCB & TEST AT PLUG
TURN ON HOT WATER TAP

Next: !p103, f365

RESISTANCE HW SENSOR

REMOVE THE PLUG (RED WIRES) FROM CONNECTOR X10 ON MAIN DRIVER BOARD.

Next: !p106, !f105

HW SENSOR FIXING

Next: p160, !f110

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: !p193, !f194

CH SENSOR FIXING

Next: p204, !f203

PRESSURE GAS INLET HW

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p232, !f235

FUSE F1

Next: p26, f311

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: p256, !f257

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: p264, !f265

DEMAND VOLTAGE

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION.

Next: p308, f30

PRESSURE GAS INLET

ATTACH U GAUGE TO INLET TEST POINT ON GAS VALVE

Next: p297, !f298

OPERATING SWITCH

OPERATING SWITCH IN THE HEATING & WATER POSITION

Next: !p33, !f32

TEMPERATURE POTENTIOMETER

REMOVE THE PLUG FROM CONNECTOR X9 ON THE MAIN DRIVER BOARD

Next: !p303, !f304

FUSE FURTHER INVESTIGATION

Next: !p312, !f313

RESISTANCE MAINS FUSE

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p315, f316

FUSE FURTHER INVESTIGATION

Next: !p317, !f318

RESISTANCE PUMP

DISCONNECT 4 PIN CONNECTOR X6 MARKED "PUMP" ON MAIN DRIVER BOARD

Next: p322, !f325

IGNITION CONTROL BOARD LIVE

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION.

Next: p337, f338

SENSOR CHECK RELAY OPERATION

OPERATING SWITCH IN HEATING & WATER POSITION

Next: !p339, f340

DIVERTER VALVE MOTOR VOLTAGE

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION

Next: !p118, f255

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: !p341, !f342

FLUE

Next: p349, !f350

OBSERVATION DHW FLOW RATE

Next: !p366, f367

OBSERVATION MAINS FLOW INTO BOILER

Next: p372, !f368

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: !p383, !f384

WATER PUMP VOLTAGE

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION.

Next: !p41, f263

SPARK ELECTRODE LEAD

Next: p391, !f392

MAIN GAS VALVE VOLTAGE

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION.

Next: p75, f74

SENSE ELECTRODE LEAD

Next: p77, !f95

RESISTANCE HW SENSOR

REMOVE THE PLUG (RED WIRES) FROM CONNECTOR X10 ON MAIN DRIVER BOARD.

Next: !p162, !f161

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: p205, !f206

TEMPERATURE POTENTIOMETER

REMOVE THE PLUG FROM CONNECTOR X9 ON THE MAIN DRIVER BOARD

Next: !p207, !f208

RESISTANCE HW SENSOR

REMOVE THE PLUG (RED WIRES) FROM CONNECTOR X10 ON MAIN DRIVER BOARD.

Next: p236, !f234

VOLTAGE MODUREG HW

{GAINPCBACS}
ALLOW MAIN BURNER TO ESTABLISH

Next: !p237, !f238

RESISTANCE HW SENSOR

REMOVE THE PLUG (RED WIRES) FROM CONNECTOR X10 ON MAIN DRIVER BOARD.

Next: p385, !f259

MAINS POWER INPUT

{GAINPCBACS}

Next: p305, f314

RESISTANCE HW SENSOR

REMOVE THE PLUG (RED WIRES) FROM CONNECTOR X10 ON MAIN DRIVER BOARD.

Next: !p266, !f267

RESISTANCE CH SENSOR

REMOVE THE PLUG (WHITE WIRES) FROM CONNECTION X10 ON MAIN DRIVER BOARD

Next: p299, !f300

MODUREG VOLTAGE CH

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION.

Next: !p301, f302

INFORMATION POWER ON NEON

Next: !p306, !f307

INFORMATION DEMAND NEON

Next: !p309, !f310

RESISTANCE FAN

DISCONNECT 5 PIN CONNECTOR MARKED CN5 ON THE IGNITION PCB

Next: p323, !f326

RESISTANCE DIVERTER VALVE

DISCONNECT 4 PIN CONNECTOR X6 MARKED "DIV VALVE" ON MAIN DRIVER BOARD

Next: p324, !f327

RESISTANCE GAS VALVE

DISCONNECT 9 PIN CONNECTOR MARKED CN3 ON THE IGNITION PCB

Next: !p329, !f328

FAN RUNNING

OPERATING SWITCH IN HEATING & WATER POSITION
REMOVE COMBUSTION CHAMBER COVER

Next: p335, f336

AIR PRESSURE SWITCH: AIR DETECT

{GAINPCBACS}
OPERATING SWITCH IN HEATING & WATER POSITION

Next: p347, f348

AIR PRESSURE SWITCH: NO AIR

{GAINPCBACS}
DISCONNECT CONNECTOR CN2 FROM THE IGNITION CONTROL BOARD

Next: p343, !f344

FAN VOLTAGE

OPERATING SWITCH IN HEATING & WATER POSITION.

Next: !p345, !f346

INLET PRESSURE

ATTACH U GAUGE TO INLET PRESSURE TEST POINT

Next: p388, !f356

INSPECTION AIR PRESSURE TUBES

LOWER CONTROLS PANEL

Next: p351, !f352

INSPECTION FAN ASSEMBLY

REMOVE FAN ASSEMBLY FROM BOILER

Next: !p353, !f354

INSPECTION DHW FILTER

TURN OFF COLD WATER SUPPLY TO APPLIANCE

Next: p377, !f370

INSPECTION DHW ISOLATION VALVE

Next: p369, !f376

INSPECTION FLOW REGULATOR

TURN OFF COLD WATER SUPPLY TO APPLIANCE

Next: !p378, !f381

FLOW SWITCH (NO DEMAND)

REMOVE PLUG X1 FROM PCB & TEST AT PLUG
ENSURE NO DHW DEMAND

Next: !p386, !f387

OBSERVATION CAN SPARKING BE SEEN

Next: p389, f390

PILOT SOLENOID VOLTAGE

{GAINPCBACS}

Next: p395, !f396

SPARK ELECTRODE

Next: !p393, !f394

PILOT

Next: !p397, !f398

MAIN GAS VALVE SOLENOID OPERATION

OPERATING SWITCH IN HEATING & WATER POSITION
CONNECT U GAUGE TO BURNER PRESSURE TEST POINT

Next: !p81, !f80

SENSE ELECTRODE

Next: !p79, !f78

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