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:

WORCESTER GREENSTAR 28I JUNIOR LPG

WARNING - IMPORTA

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

WORCESTER GREENSTAR 28I JUNIOR LPG

CASE REMOVAL<

Next: &470, !f2

CHOOSE FROM THE DIAGNOSTICS OPTIONS:

Next: &466, !f4

DHW FLOW RATE

Next: &1325, f6

DHW OPERATION

Next: &148, ?96, ?98, ?100, ?102, ?671

CH OPERATION

Next: &173, ?149, ?151, ?715, ?847

CENTRAL HEATING MODULATION

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: &177, f174

PRE-HEAT

ENSURE THE ECO BUTTON IS OFF
RUN THE HOT WATER UNTIL THE SECONDARY HEAT EXCHANGER IS COOL

Next: &183, f178

PUMP OVERRUN

SET TEMPERATURE CONTROL TO MID POSITION

Next: &185, !f184

SYPHON OPERATION

ON/OFF SWITCH ON

Next: &nff, !f186

CH DEMAND

Next: &1536, f263

DHW BURNER IGNITION & ESTABLISH

ECO MODE ON (NO PREHEAT)

Next: &262, ?318, ?320, ?322, ?986

ENHANCED FAULT CODES

SELECT APPROPRIATE F

Next: &1052, !f467

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &3, !f471

MAXIMUM OUTPUT MODE

INSTRUCTIONS TO S

Next: &nff, !f701

FURTHER INVESTIGATION OVERHEAT

NOT USED

Next: &nff, f911

NORMAL OPERATION

NOT USED

Next: &nff, !f1045

POWER UP

Next: &5, f1053

FURTHER INVESTIGATION FUSE BLOWN

NOT USED

Next: &nff, f1075

INSPECTION INTERNAL BOILER

Next: &317, !f1326

PUMP RUNNING

REMOVE PUMP VENT SCR

Next: &1542, f1537

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: &1548, f1543

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: &1550, !f1549

COMBUSTION ANALYSIS MAX AND MIN

UNCLIP DIVERTER VALVE HEAD FROM THE BODY AND LEAVE IN A SAFE POSITION

Next: &95, ?1551, ?1553

COMBUSTION ANALYSIS MAX AND MIN CH

UNCLIP DIVERTER VALVE HEAD FROM THE BODY AND LEAVE IN A SAFE POSITION

Next: &nff, ?1596, ?1598

CH OPERATION PERFORMANCE TEST FAIL

OUTSIDE OF MODEL

Next: &nff, f1601

BURNER BAFFLES OUT

FLUE

Next: End

BURNER BAFFLES OUT

BURNER

Next: End

DOES NOT ESTABLISH

BURNER

Next: End

DHW TO COOL

BURNER

Next: End

OVERHEAT OCCURED

NORMAL OPERATION

Next: End

FLUE OVERHEAT

BURNER

Next: End

FLUE OVERHEAT

PRIMARY HEAT EXCHANGER

Next: End

BLOWN STAND BY MODE AT POWER UP

FUSE (FUSED SPUR)

Next: End

LED AT POWER UP

PCB

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

FAN ASSEMBLY

Next: End

FURTHER INVESTIGATION

TRANSFORMER

Next: End

FURTHER INVESTIGATION

GAS VALVE

Next: End

FAN DOES NOT RUN

Z REDIRECTION

Next: End

BLOWN STANDBY MODE

FUSE - MAINS

Next: End

BLOWN STANDBY MODE

FUSE

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION

Next: End

BURNER IGNITION

TRANSFORMER

Next: End

IGNITION

WATER LEAK

Next: End

FAN RUNS

AIR PRESSURE SWITCH

Next: End

FAN RUNS

SENSOR OVER HEAT

Next: End

BURNER IGNITION

SENSOR - FLUE (LIMITER - TEMPERATURE)

Next: End

GAS VALVE

PCB

Next: End

FAN REDUCES AND STOPS

PCB

Next: End

FAN REDUCES AND STOPS

BURNER

Next: End

BURNER IGNITES

SYPHON

Next: End

BURNER IGNITES

INLET PRESSURE

Next: End

GAS VALVE BURNER IGNITES

HARNESS - MAINS

Next: End

BURNER DOES NOT IGNITE

BURNER

Next: End

SPARKING

PCB

Next: End

BURNER IGNITES

HARNESS ELECTRODE SPARK

Next: End

BURNER IGNITES

ELECTRODE

Next: End

DOES NOT IGNITE PRESSURE DROPS

BURNER

Next: End

DOES NOT IGNITE

PRIMARY HEAT EXCHANGER

Next: End

PUMP - DHW COOL RADS COOL

PCB

Next: End

DHW COOL RADS COOL

HARNESS - PUMP

Next: End

COOL DHW

PUMP

Next: End

STSLOW THEN TO TO HIGH SPEED

HARNESS FAN

Next: End

BETWEEN 125 VAC AND 135 VAC

HARNESS FAN

Next: End

BELOW 124 VAC

HARNESS FAN

Next: End

OVERHEAT

DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT

SENSOR - FLUE (LIMITER - TEMPERATURE)

Next: End

PREHEAT

SENSOR - TEMPERATURE - DHW

Next: End

OVERHEAT

SENSOR OVER HEAT

Next: End

OVERHEAT 2

SENSOR - FLUE (LIMITER - TEMPERATURE)

Next: End

DHW SENSOR

SENSOR - TEMPERATURE - DHW

Next: End

PUMP - DHW COOL RADS COOLPUMP RUNNING PRE TEST

PCB

Next: End

DHW COOL RADS COOLPUMP RUNNING PRE TEST

HARNESS - PUMP

Next: End

PRIMARY PRE TEST FAN PRESSURE

BURNER

Next: End

PRIMARY PRE TEST FAN PRESSURE

PRIMARY HEAT EXCHANGER

Next: End

PRIMARY TEST

INLET PRESSURE

Next: End

DHW NOISEY

BYPASS INTERNAL VALVE

Next: End

PUMP - HEAT EXCHANGER NOISY

PCB

Next: End

HEAT EXCHANGER NOISY

HARNESS - PUMP

Next: End

INTERNAL CLOCK2DHW NOISY

PCB

Next: End

INTERNAL CLOCKDHW NOISY

PCB

Next: End

EXTERNAL CONTROLS INPUT (DHW)DHW NOISY

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

BURNER

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

PRIMARY HEAT EXCHANGER

Next: End

OVERHEAT

SENSOR - PRIMARY (CONTROL)

Next: End

CH NOISY

SENSOR - PRIMARY (CONTROL)

Next: End

DHW HOT THEN COLD

SENSOR - PRIMARY (CONTROL)

Next: End

CH MODULATION

SENSOR - PRIMARY (CONTROL)

Next: End

TURBINE

HARNESS - MAINS

Next: End

FAN DOES NOT RUN

SENSOR - PRIMARY (CONTROL)

Next: End

FAN DOES NOT RUN

SENSOR - TEMPERATURE - DHW

Next: End

FAN RUNS

HARNESS FAN

Next: End

FAN VOLTAGE PCB

PCB

Next: End

FAN DOES NOT RUN

HARNESS FAN

Next: End

FAN DOES NOT RUN

Z REDIRECTION

Next: End

FAN DOES NOT RUN

CODE PLUG

Next: End

BURNER IGNITION

SENSOR - PRIMARY (CONTROL)

Next: End

DHW COOL RADS HOT DIVERTER MOTOR SUPPLY

PCB

Next: End

DHW COOL RADS HOT

HARNESS - STEPPER MOTOR

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT DIVERTER MOTOR SUPPLY

PCB

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT

HARNESS - STEPPER MOTOR

Next: End

PUMP OVERRUN

PCB

Next: End

SYPHON

SYPHON

Next: End

ELECTRICAL SAFETY

ELECTRICAL SAFETY CHECKS

Next: End

EXTERNAL CONTROLS INPUT (DHW)

Next: End

INTERNAL CLOCK

PCB

Next: End

INTERNAL CLOCK2

PCB

Next: End

DOES NOT ESTABLISH

INLET PRESSURE

Next: End

FLAME SENSE BURNER IGNITES

HARNESS - MAINS

Next: End

BURNER IGNITES

ELECTRODE ASSEMBLY

Next: End

SYSTEM CHECKS

SYSTEM CHECKS

Next: End

FAULT CODES

ENHANCED FAULT CODES

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

BURNER DOES NOT ESTABLISH

SYPHON

Next: End

DHW COOL RADIATORS COOL

SENSOR - TEMPERATURE - DHW

Next: End

DHW TOO COOL

BYPASS INTERNAL VALVE

Next: End

DHW TOO COOL

SENSOR - TEMPERATURE - DHW

Next: End

HOT THEN COLD

SECONDARY HEAT EXCHANGER

Next: End

DHW HOT THEN COLD

PUMP

Next: End

MAXIMUM OUTPUT INSTRUCTIONS

MAXIMUM OUTPUT INSTRUCTIONS

Next: End

EXPANSION VESSEL

EXPANSION VESSEL

Next: End

DHW COOL

SYSTEM PRESSURE

Next: End

DHW NOISY

SYSTEM PRESSURE

Next: End

DHW HOT THEN COLD

SYSTEM PRESSURE

Next: End

CH NOISY

PUMP

Next: End

CH NOISY

SYSTEM PRESSURE

Next: End

RADS DO NOT HEAT

SYSTEM PRESSURE

Next: End

RADS DO NOT HEAT

PUMP

Next: End

RADS DO NOT HEAT

ISOLATION VALVES

Next: End

OVERHEAT FURTHER INVESTIGATION

Z REDIRECTION

Next: End

FAN RUNS OVERHEAT 1

AIR PRESSURE SWITCH

Next: End

FAN RUNS OVERHEAT 1

SENSOR OVER HEAT

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT

PUMP

Next: End

RADS COLD

BYPASS INTERNAL VALVE

Next: End

BURNER BAFFLES OUT

SYPHON

Next: End

BURNER BAFFLES OUT

INLET PRESSURE

Next: End

BURNER BAFFLES OUT

GAS VALVE

Next: End

BURNER BAFFLES OUT

PRIMARY HEAT EXCHANGER

Next: End

BURNER DOES NOT EST

PRIMARY HEAT EXCHANGER

Next: End

DHW COOL RAD COOL

PRIMARY HEAT EXCHANGER

Next: End

APS/FLUE/OH OVERHEAT 1

HARNESS - MAINS

Next: End

BURNER IGNITION OVERHEAT 1

SENSOR - FLUE (LIMITER - TEMPERATURE)

Next: End

SUPPLY FAULT AT POWER UP

Next: End

FURTHER INVESTIGATION FUSED SPUR

Z DIRECTION

Next: End

DHW COOL RADIATORS HOT

DIVERTER VALVE ASSEMBLY

Next: End

FURTHER INVESTIGATION LED PCB FAULT TO FAN RUNS BURNER IGNITES AND ESTABLISHES

Z REDIRECTION

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS - PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS FAN

Next: End

FLOW RATE

INLET FILTER

Next: End

FURTHER INVESTIGATION

HARNESS - MAINS

Next: End

FURTHER INVESTIGATION

PCB

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION

Next: End

FURTHER INVESTIGATION F3

Z DIRECTION

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE

Next: End

TRANSFORMER

PCB

Next: End

FLOW RATE

FLOW REGULATOR

Next: End

BURNER DOES NOT IGNITE

Z REDIRECTION

Next: End

APS/FLUE/OH

HARNESS - MAINS

Next: End

FAN REDUCES STOPS

AIR PRESSURE SWITCH

Next: End

FAN REDUCES AND STOPS

PRIMARY HEAT EXCHANGER

Next: End

VOLTAGE GAS VALVE

PCB

Next: End

NO VOLTAGE

PCB

Next: End

BURNER IGNITES

GAS VALVE

Next: End

BURNER DOES NOT IGNITE2

PRIMARY HEAT EXCHANGER

Next: End

BURNER DOES NOT IGNITE

GAS VALVE

Next: End

DHW COOL RADIATORS COOL

PUMP

Next: End

DHW TOO COOL

PCB

Next: End

CH NOISY

PCB

Next: End

CH NOISY

PRIMARY HEAT EXCHANGER

Next: End

CH NOISY

Next: End

SLOW THEN TO HIGH SPEED

FAN ASSEMBLY

Next: End

FLOW RATE

NOZZLES

Next: End

FAN RUNS SLOW THEN TO HIGH SPEED

PCB

Next: End

BELOW 124 VAC

FAN ASSEMBLY

Next: End

BOILER GOES TO OVERHEAT

SENSOR OVER HEAT

Next: End

FAN RUNSOVERHEAT

AIR PRESSURE SWITCH

Next: End

DHW TOO HOT

PCB

Next: End

DHW TOO HOT

HARNESS - MAINS

Next: End

DHW COOL RADIATORS COOLPUMP RUNNING PRE TEST

PUMP

Next: End

FAN PRESSURE PRIMARY TEST

FLUE

Next: End

CO2 SETTINGS INCORRECT

GAS VALVE SETTING RETEST

Next: End

DROPS OUT ON MINIMUM

GAS VALVE SETTING

Next: End

HEAT EXCHANGER NOISY

PRIMARY HEAT EXCHANGER

Next: End

HEAT EXCHANGER NOISY

PUMP

Next: End

CH OPERATION DHWDHW NOISY

HEATING CONTROLS

Next: End

CH DEMAND 1DHW NOISY

INTERNAL CLOCK

Next: End

EXTERNAL CONTROLS RETURNDHW NOISY

Next: End

CH OPERATION (DHW)DHW NOISY

HEATING CONTROLS

Next: End

PT FROM CH SEQUENCECO2 SETTINGS INCORRECT

GAS VALVE SETTING RETEST

Next: End

PT FROM CH SEQUENCEDROPS OUT ON MINIMUM

GAS VALVE SETTING

Next: End

CH OP PT FAIL

GAS VALVE SETTING RETEST

Next: End

CH OP PT FAIL FAN PRESSURE FAIL

FLUE

Next: End

ELECTRICAL

FLOW SENSOR TURBINE

Next: End

FAN SIGNAL

PCB

Next: End

FLOW SENSOR FAN RUNS 2

HARNESS - MAINS

Next: End

DHW SENSOR FAN DOES NOT RUN

HARNESS - MAINS

Next: End

FAN DOES NOT RUN

PCB

Next: End

DOES NOT RUN

FAN ASSEMBLY

Next: End

FAN RUNS

FAN ASSEMBLY

Next: End

FAN DOES NOT RUN

LOCKOUT

Next: End

FAN RUNS RESISTANCE

PCB

Next: End

FLOW SENSOR FAN RUNS

HARNESS - MAINS

Next: End

DHW COOL RADS HOT MECHANICAL FAULT

DIVERTER VALVE MOTOR

Next: End

DHW COOL RADS HOT STEPPER VOLTAGE

PCB

Next: End

DHW COOL RADS HOT ELECTRICAL FAULT

DIVERTER VALVE MOTOR

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT MECHANICAL FAULT

DIVERTER VALVE MOTOR

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT STEPPER VOLTAGE

PCB

Next: End

BOILER REACHES TEMP RADS DO NOT HEAT ELECTRICAL FAULT

DIVERTER VALVE MOTOR

Next: End

CH MODULATION

PCB

Next: End

PRE-HEAT

PCB

Next: End

EXTERNAL CONTROLS RETURN

Next: End

CH OPERATION (DHW)

HEATING CONTROLS

Next: End

CH DEMAND 1

INTERNAL CLOCK

Next: End

CH OPERATION DHW

HEATING CONTROLS

Next: End

FLAME SENSE

PCB

Next: End

MODULATION

GAS VALVE

Next: End

DHW TOO COOL 2

PCB

Next: End

DHW COOL RADIATORS COOL

SECONDARY HEAT EXCHANGER

Next: End

DHW HOT THEN COLD

PCB

Next: End

FLOW RATE

SECONDARY HEAT EXCHANGER

Next: End

DHW TOO COOL 3

PCB

Next: End

HEAT EXCHANGER NOISY

SECONDARY HEAT EXCHANGER

Next: End

EXCESSIVE SYSTEM PRESSURE

EXPANSION VESSEL PIPE

Next: End

RADS DO NOT HEAT

Next: End

FURTHER INVESTIGATION OVERHEAT

Z REDIRECTION

Next: End

FLOW RATE

FLOW SENSOR TURBINE

Next: End

GAS VALVE OVERHEAT 1

PCB

Next: End

BURNER DOES NOT IGNITE OVERHEAT 1

Z REDIRECTION

Next: End

OVERHEAT

PCB

Next: End

INLET FILTER BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p11

DHW COOL, RADIATORS HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p101

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1531

FLOW REGULATOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p13

AFTER 12/14 SECONDS FAN SPEED INCREASES

CHARACTERISTIC TEST FROM MODE OF FAN OPERATION

Next: p1330

AFTER 4/5 SECONDS FAN REDUCES AND STOPS

CHARACTERISTIC TEST FROM MODE OF FAN OPERATION

Next: p1332

NOZZLES BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p15

TEMPERATURE DIFFERENTIAL INCORRECT LOCAL NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1488

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1490

BOILER NOISY

CHARACTERISTIC TEST FROM CH OPERATION

Next: p779

VOLTAGE BETWEEN 125 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p1495

VOLTAGE BELOW 124 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p1497

BOILER REACHES TEMPERATURE, RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p796

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1552

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1554

OPERATION IS NOISY

CHARACTERISTIC TEST FROM CH OPERATION (DHW OPERATION)

Next: p1559

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (DHW OPERATION)

Next: p1582

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1597

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1599

240 VOLTS ACROSS PURPLE BROWN OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p1632

240 VOLTS ACROSS PURPLE/BROWN ABSENT

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p1634

VOLTAGES DO NOT BEHAVE AS DESCRIBED ABOVE ON ONE OR MORE TESTS

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE PCB DROP RETURN TO 15V

Next: p1665

15 VDC PRESENT BUT VOLTAGE DOESNT CHANGE

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE PCB DROP RETURN TO 15V

Next: !p1667

VOLTAGES DO NOT BEHAVE AS DESCRIBED ABOVE ON ONE OR MORE TESTS

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE PCB DROP RETURN TO 15V

Next: p1675

15 VDC PRESENT BUT VOLTAGE DOESNT CHANGE

CHARACTERISTIC TEST FROM VOLTAGE DIVERTER VALVE PCB DROP RETURN TO 15V

Next: !p1677

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p319

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1327

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1270

DIFFERENTIAL TO HIGH

CHARACTERISTIC TEST FROM DIFFERENTIAL PLATE HEAT EX

Next: !p666

DIFFERENTIAL TO LOW

CHARACTERISTIC TEST FROM DIFFERENTIAL PLATE HEAT EX

Next: p668

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p761

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM CH OPERATION

Next: p716

FLOW SENSOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p9

OPERATION SATISFACTORY BUT BOILER GOES TO OVERHEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p848

HEAT EXCHANGER NOISY

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p720

DHW TOO COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p733

BURNER IGNITES BUT BAFFLES OUT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p987

29/07/2013 15:41:13 1309_1_40_1 31/07/2013 10:21:22

30/07/2013 08:41:22

Next: End

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1023, !f1014

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1026, !f1027

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1042, !f1043

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1048, !f1049

VOLTAGE MAINS POWER INPUT TO APPLIANCE

{GAINPCBACS}

Next: p1054, f1055

RESISTANCE FUSE (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1056, f1057

FUSE FURTHER INVESTIGATION

Next: !p1058, !f1059

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS FURTHER INVESTIGATION

DISCONNECT ST9 CONNE

Next: p1076, f1077

HARNESS GAS VALVE

REMOVE THE CONNECTOR

Next: !p1107, !f1108

RESISTANCE PUMP

DISCONNECT THE PUMP CONNECTOR

Next: !p1082, !f1083

RESISTANCE FAN

DISCONNECT FAN CONNECTOR AT FAN

Next: !p1086, !f1087

FUSE F1

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1273, f1274

FUSE FURTHER INVESTIGATION F1

Next: !p1275, !f1276

FUSE FURTHER INVESTIGATION F3

Next: !p1279, !f1280

FUSE FURTHER INVESTIGATION F2

Next: !p1283, !f1284

AIR PRESSURE SWITCH

Next: p1335, f1336

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT ONE OF THE ORANGE LEADS FROM THE AIR PRESSURE SWITCH.

Next: !p1337, !f1338

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1349, !f1350

VOLTAGE GAS VALVE

REMOVE THE GAS VALVE CONNECTORS FROM THE GAS VALVE

Next: p1361, f1362

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT ST9 CONNE

Next: !p1363, f1364

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p1365, !f1366

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1369, !f1370

PUMP VOLTAGE

{GAINPCBACS}

Next: p1477, !f1478

DOES BOILER HAVE AN AIR PRESSURE SWITCH

Next: p1523, f929

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1534, !f1535

PUMP VOLTAGE

{GAINPCBACS}

Next: p1538, !f1539

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1544, !f1545

PUMP VOLTAGE

{GAINPCBACS}

Next: p1565, !f1566

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p1585, f1586

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p1587, !f1588

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p1593, !f1594

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1602, f1603

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1604, !f1605

VOLTS TO TURBINE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p1617, f1618

HARNESS CONTINUITY (TURBINE)

BREAK THE INLINE CONNECTOR IN THE TURBINE LEAD
DISCONNECT THE 20 WAY CONNECTOR FROM THE PCB

Next: !p1619, !f1620

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p1623, !f1624

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1627, !f1628

RESET OPERATION

ECO MODE ON
ENSURE NO DEMAND

Next: p1652, f1655

CODE PLUG

LOWER THE FACIA PANEL

Next: p1656, !f1657

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p1660, !f1661

VOLTAGE DIVERTER VALVE PCB RETURN TO 15V

{GAINPCBACS}
NO DEMAND
ECO MODE ON (ILLUMINATED)

Next: !p1663, ?1664, ?1666

VOLTAGE DIVERTER VALVE PCB RETURN TO 15V

{GAINPCBACS}
NO DEMAND
ECO MODE ON (ILLUMINATED)

Next: !p1673, ?1674, ?1676

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: !p175, !f1611

RESISTANCE SENSOR DHW

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p179, !f1514

INTERNAL OR EXTERNAL CONTROLS

Next: p264, f265

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p298, f299

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p292, !f290

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p302, !f303

ELECTRODE SENSE HARNESS

DISCONNECT FLAME SENSE LEAD FROM ELECTRODE
DISCONNECT CONNECTER ST9 FROM THE PCB

Next: !p396, !f397

CHECK FLOW COMPONENTS

DRAIN THE DOMESTIC H

Next: !p7, ?8, ?10, ?12, ?14

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1484, !f656

FLUEWAYS

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p661, f1041

BOILER RESET

ENSURE BOILER HAS COOLED

Next: p923, f912

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: !p913, f914

AIR PRESSURE SWITCH

Next: p915, f916

RESISTANCE AIR PRESSURE SWITCH

DISCONNECT ONE OF THE ORANGE LEADS FROM THE AIR PRESSURE SWITCH.

Next: !p917, !f918

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1510, !f1511

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p106, f1662

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1050, !f1051

FAN RUNS DHW DEMAND

Next: p1060, !f1139

FURTHER INVESTIGATION LED PROBLEM

Next: !p1072, !f1073

RESISTANCE PUMP AND HARNESS

REMOVE THE PUMP CONNECTOR ST4 FROM THE PCB

Next: p1080, f1081

RESISTANCE FAN AND HARNESS

DISCONNECT FAN CONNECTOR ST5 FROM THE PCB

Next: p1084, f1085

RESISTANCE TRANSFORMER

REMOVE THE BACKPLATE OF THE CONTROL BOX AND THE TRANSFORMER FROM THE PCB

Next: !p1109, !f1089

VOLTAGE AT PCB

{GAINPCBACS}

Next: p1271, f1272

VOLTAGE PUMP LINE

ENSURE NO DEMAND
ECO MODE ON

Next: p1614, f1641

FUSE F3

REMOVE CONTROL BOX C

Next: p1277, f1278

FUSE F2

REMOVE CONTROL BOX C

Next: p1281, f1282

TRANSFORMER RESISTANCE

REMOVE THE BACKPLATE OF THE CONTROL BOX AND THE TRANSFORMER FROM THE PCB

Next: !p1285, !f1286

MODE OF FAN OPERATION

Next: p1328, ?1329, ?1331

CONDENSATE PIPE

Next: p1355, !f1356

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p1351, ?1494, ?1496

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1333, f1334

AIR PRESSURE SWITCH FITTED

Next: p1343, !f1344

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p1339, !f1340

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1341, !f1342

AIR PRESSURE SWITCH (DEMAND)

Next: p1345, !f1346

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1347, f1348

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR ST5 FORM THE PCB
DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1498, !f1499

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p1357, !f1358

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p1359, f1360

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p1371, !f1372

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1367, f1368

ELECTRODE SPARK HARNESS

REMOVE THE IGNITION HARNESS CONNECTION FROM THE ELECTRODES TOP OF THE BURNER AND FROM THE PCB

Next: p1373, !f1374

INSPECTION SPARK ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: p1375, !f1376

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1377, !f1378

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1379, !f1380

PUMP RUNNING

REMOVE PUMP VENT SCR

Next: p646, f1470

PUMP HARNESS CONTINUITY

REMOVE THE PUMP PLUG FROM THE PUMP AND THE PUMP HARNESS CONNECTOR FROM THE PCB

Next: !p1479, !f1480

DIFFERENTIAL FLOW RETURN

TEMPERATURE CONTROL SET TO MAXIMUM
ATTACH TEMPERATURE CLAMPS TO FLOW AND RETURN PIPES

Next: !p1486, ?1487, ?1489

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR ST5 FORM THE PCB
DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1500, !f1501

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR ST5 FORM THE PCB
DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1502, !f1503

COOL APPLIANCE

ENSURE ALL RADS ARE TURN ON
ATTACH TEMPERATURE CLAMP TO FLOW PIPE

Next: p928, !f1509

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p822, !f812

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1529, !f1530

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p1520, !f1528

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: !p1532, f1533

PUMP HARNESS CONTINUITY

REMOVE THE PUMP PLUG FROM THE PUMP AND THE PUMP HARNESS CONNECTOR FROM THE PCB

Next: !p1540, !f1541

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1546, !f1547

PUMP LIMPET TEST

Next: p1560, f1564

BYPASS - INTERNAL (DHW NOISY)

ENSURE RADS ARE OPEN AND WATER CAN CIRCULATE AROUND
THE SYSTEM

Next: !p1562, !f1563

PUMP HARNESS CONTINUITY

REMOVE THE PUMP PLUG FROM THE PUMP AND THE PUMP HARNESS CONNECTOR FROM THE PCB

Next: !p1567, !f1568

INTERNAL OR EXTERNAL CONTROLS

Next: p1583, f1584

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p1591, f1592

INTERNAL CLOCK

REMOVE AND DISCONNECT THE INTERNAL CLOCK ASSEMBLY FROM THE BOILER.

Next: !p1589, !f1590

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1606, !f1607

VOLTS FROM TURBINE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1615, f1616

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1621, f1622

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1625, f1626

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p1629, ?1631, ?1633

VOLTAGE FAN (PCB DEMAND)

DISCONNECT FAN ELECTRICAL CONNECTOR FROM THE FAN
ASSEMBLY, POSITION IN A SAFE PLACE

Next: p1637, !f1638

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR ST5 FORM THE PCB
DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1635, !f1636

RESISTANCE FAN HARNESS

DISCONNECT CONNECTOR ST5 FORM THE PCB
DISCONNECT CONNECTOR FROM THE FAN ASSEMBLY

Next: !p1639, !f1640

FAN RUNS

Next: !p1653, !f1654

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: !p1658, f1659

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
ECO MODE ON (ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p1668, !f1669

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT THE ST17

Next: !p1670, !f1671

VOLTAGE DIVERTER MOTOR SUPPLY PCB

NO DEMAND
ECO MODE ON (ILLUMINATED)
REMOVE CONNECTOR ST17 FROM PCB

Next: p1678, !f1679

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT THE ST17

Next: !p1680, !f1681

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p288, f287

INTERNAL CLOCK

REMOVE AND DISCONNECT THE INTERNAL CLOCK ASSEMBLY FROM THE BOILER.

Next: !p300, !f301

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p392, !f393

RECTIFICATION VOLTAGE

DISCONNECT FLAME SENSE LEAD (GREEN LEAD) FROM
SENSE ELECTRODE AND SECURE IT AS SHOWN

Next: p542, f395

ELECTRODE SENSE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p1116, !f399

CONDENSATE PIPE

Next: p553, !f550

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p394, f1025

PUMP LIMPET TEST

Next: p647, !f1481

FAN SPEED

Next: p653, f654

COMBUSTION CHECK

PREPARE THE BOILER F

Next: p659, f660

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE PROBES TO FLOW AND RETURN PIPES OF THE PRIMARY HEAT EXCHANGER AS ILLUSTRATED

Next: !p663, ?665, ?667

CH BYPASS CHECK-DHW

ATTACH FGA TEMPERATURE PROBES TO THE BYPASS TUBE AND FLOW PIPE FROM HEAT EXCHANGER.

Next: !p702, !f670

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: p678, !f674

DIFFERENTIAL PLATE HEAT EX

ATTACH TEMPERATURE PROBES TO FLOW AND RETURN PIPES OF THE PRIMARY HEAT EXCHANGER AS ILLUSTRATED

Next: !p675, !f677

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: p673, !f1610

PUMP LIMPET TEST

Next: p672, !f697

CH OPERATION

Next: !p704, ?1555, ?1557

INSPECTION VESSEL PRESSURE

CLOSE FLOW AND RETURN ISOLATION VALVES
DISCHARGE PRIMARY SYSTEM WATER

Next: !p718, !f719

INSPECTION PRESSURE SYSTEM

Next: p703, !f760

INSPECTION PRESSURE SYSTEM

Next: p1429, !f759

INSPECTION PRESSURE SYSTEM

Next: p683, !f771

PUMP LIMPET TEST

Next: p775, !f776

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: p1485, !f1609

INSPECTION PRESSURE SYSTEM

Next: p774, !f785

INSPECTION PRESSURE SYSTEM

Next: p152, !f804

PUMP LIMPET TEST

Next: p815, !f811

BYPASS (INTERNAL)

ENSURE RADS ARE OPEN AND WATER CAN CIRCULATE AROUND THE SYSTEM

Next: !p834, !f934

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: p805, f1672

BOILER RESET

ENSURE BOILER HAS COOLED

Next: !p849, !f910

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p919, !f920

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1047, f1046

INSPECTION PRESSURE SYSTEM

Next: p924, !f925

PUMP LIMPET TEST

Next: p927, !f926

RUN BOILER TO MAX TEMP-DOES OVERHEAT OCCUR

ATTACH TEMPERATURE CLAMP TO FLOW PIPE
SET BOILER TEMPERATURE CONTROL TO MAXIMUM

Next: p1505, f1515

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: !p930, !f1608

CONDENSATE PIPE

Next: p989, !f988

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p990, !f991

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: p992, f1010

INSPECTION FLUE

Next: !p1020, !f1011

System Information

Total Tests: 429

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control