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

WARNING - IMPORTA

Next: &1, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

WORCESTER GREENSTAR 28I JUNIOR

CASE REMOVAL<

Next: &470, !f2

CHOOSE FROM THE DIAGNOSTICS OPTIONS:

Next: &466, !f4

DHW FLOW RATE

Next: &1629, 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: &1815, f263

DHW BURNER IGNITION & ESTABLISH

ECO MODE ON (NO PREHEAT)

Next: &262, ?318, ?322, ?986, ?1509

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, !f1630

PUMP RUNNING

REMOVE PUMP VENT SCR

Next: &1826, f1821

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: &1833, f1827

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: &1835, !f1834

COMBUSTION ANALYSIS MAX AND MIN

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

Next: &95, ?1836, ?1838

COMBUSTION ANALYSIS MAX AND MIN CH OP SEQUENCE

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

Next: &nff, ?1875, ?1877

CH OPERATION PERFORMANCE TEST FAIL

OUTSIDE OF MODEL

Next: &nff, f1880

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

DHW COOL

PUMP

Next: End

NO IGNITION

WATER LEAK

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

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

CH MODULATION

SENSOR - PRIMARY (CONTROL)

Next: End

STSLOW THEN TO TO HIGH SPEED

HARNESS FAN

Next: End

BETWEEN 125 VAC AND 135 VAC

HARNESS FAN

Next: End

ABOVE 135 VAC

HARNESS FAN

Next: End

PREHEAT

SENSOR - TEMPERATURE - DHW

Next: End

OVERHEAT

DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT

SENSOR - PRIMARY (CONTROL)

Next: End

OVERHEAT

SENSOR - FLUE (LIMITER - TEMPERATURE)

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

PUMP OVERRUN

PCB

Next: End

DHW NOISEY

BYPASS INTERNAL VALVE

Next: End

PUMP - HEAT EXCHANGER NOISY

PCB

Next: End

HEAT EXCHANGER NOISY

HARNESS - PUMP

Next: End

SYPHON

SYPHON

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

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

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

SENSOR - PRIMARY (CONTROL)

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

SENSOR - PRIMARY (CONTROL)

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

FLOW RATE

FLOW REGULATOR

Next: End

DHW TOO COOL

PCB

Next: End

FLOW RATE

NOZZLES

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

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

CH MODULATION

PCB

Next: End

BELOW 124 VAC

FAN ASSEMBLY

Next: End

FAN RUNS SLOW THEN TO HIGH SPEED

PCB

Next: End

SLOW THEN TO HIGH SPEED

FAN ASSEMBLY

Next: End

PRE-HEAT

PCB

Next: End

OVERHEAT

PCB

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

CH NOISY

PCB

Next: End

CH NOISY

PRIMARY HEAT EXCHANGER

Next: End

CH NOISY

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

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

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: p1810

FLOW REGULATOR BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p13

NOZZLES BLOCKED AND/OR IN POOR CONDITION

CHARACTERISTIC TEST FROM CHECK FLOW COMPONENTS

Next: !p15

BOILER NOISY

CHARACTERISTIC TEST FROM CH OPERATION

Next: p779

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1687

BOILER REACHES TEMPERATURE, RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p796

AFTER 12/14 SECONDS FAN SPEED INCREASES

CHARACTERISTIC TEST FROM MODE OF FAN OPERATION

Next: p1690

AFTER 4/5 SECONDS FAN REDUCES AND STOPS

CHARACTERISTIC TEST FROM MODE OF FAN OPERATION

Next: p1692

VOLTAGE ABOVE 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p1757

VOLTAGE BETWEEN 124 VAC AND 135 VAC

CHARACTERISTIC TEST FROM FAN VOLTAGE CONTROL (PCB)

Next: p1759

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1837

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1839

OPERATION IS NOISY

CHARACTERISTIC TEST FROM CH OPERATION (DHW OPERATION)

Next: p1844

BOILER DOES NOT REACT TO CH DEMAND

CHARACTERISTIC TEST FROM CH OPERATION (DHW OPERATION)

Next: p1855

TEMPERATURE DIFFERENTIAL INCORRECT LOCAL NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1871

DIFFERENTIAL OK SYSTEM NOISE

CHARACTERISTIC TEST FROM DIFFERENTIAL FLOW RETURN

Next: !p1873

CO2 SETTINGS INCORRECT

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1876

BURNER DROPS OUT IN MINIMUM MODE

CHARACTERISTIC TEST FROM COMBUSTION ANALYSIS MAX AND MIN

Next: !p1878

240 VOLTS ACROSS PURPLE BROWN OTHERS NOT AS ABOVE

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: p1905

240 VOLTS ACROSS PURPLE/BROWN ABSENT

CHARACTERISTIC TEST FROM VOLTAGE FAN (AT PCB)

Next: !p1907

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

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

Next: p1938

15V DC PRESENT BUT VOLTAGE DOESNT CHANGE

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

Next: !p1940

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

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

Next: p1948

15V DC PRESENT BUT VOLTAGE DOESNT CHANGE

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

Next: !p1950

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p319

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM DHW BURNER IGNITION & ESTABLISH

Next: p1632

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 14:40:53 1309_1_40_1 31/07/2013 10:20:50

30/07/2013 08:38:00

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 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

PUMP VOLTAGE

{GAINPCBACS}

Next: p1741, !f1744

FUSE F1

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1635, f1636

FUSE FURTHER INVESTIGATION F1

Next: !p1637, !f1638

FUSE FURTHER INVESTIGATION F3

Next: !p1641, !f1642

FUSE FURTHER INVESTIGATION F2

Next: !p1645, !f1646

AIR PRESSURE SWITCH

Next: p1695, f1696

RESISTANCE AIR PRESSURE SWITCH

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

Next: !p1697, !f1698

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1709, !f1710

VOLTAGE GAS VALVE

REMOVE THE GAS VALVE CONNECTORS FROM THE GAS VALVE

Next: p1721, f1722

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT ST9 CONNE

Next: !p1723, f1724

RESISTANCE GAS VALVE HARNESS

REMOVE THE CONNECTOR

Next: !p1725, !f1726

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p1729, !f1730

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: !p175, !f176

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p179, !f1769

DOES BOILER HAVE AN AIR PRESSURE SWITCH

Next: p1802, f1803

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1804, !f1805

DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1813, !f1814

PUMP VOLTAGE

{GAINPCBACS}

Next: p1822, !f1823

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1828, !f1829

PUMP VOLTAGE

{GAINPCBACS}

Next: p1851, !f1852

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: p1858, f1859

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p1860, !f1861

EXTERNAL CONTROL VOLTAGE (SEND)

Next: !p1866, !f1867

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1881, f1882

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1883, !f1884

VOLTS TO TURBINE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: !p1890, f1891

HARNESS CONTINUITY (TURBINE)

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

Next: !p1892, !f1893

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p1896, !f1897

RESISTANCE DHW SENSOR

REMOVE YELLOW WIRES FROM DHW SENSOR

Next: !p1900, !f1901

RESET OPERATION

ECO MODE ON
ENSURE NO DEMAND

Next: p1925, f1928

CODE PLUG

LOWER THE FACIA PANEL

Next: p1929, !f1930

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG (RE

Next: !p1933, !f1934

VOLTAGE DIVERTER VALVE PCB RETURN TO 15V

{GAINPCBACS}
NO DEMAND
ECO MODE ON (ILLUMINATED)

Next: !p1936, ?1937, ?1939

VOLTAGE DIVERTER VALVE PCB RETURN TO 15V

{GAINPCBACS}
NO DEMAND
ECO MODE ON (ILLUMINATED)

Next: !p1946, ?1947, ?1949

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: !p1451, !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

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

DIVERTER VALVE ACTUATOR OPERATION

REMOVE THE DIVERTER

Next: !p106, f1935

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

PUMP RUNNING

REMOVE PUMP VENT SCR

Next: p646, f1440

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p822, !f812

VOLTAGE AT PCB

{GAINPCBACS}

Next: p1633, f1634

VOLTAGE PUMP LINE

ENSURE NO DEMAND
ECO MODE ON

Next: p1887, f1914

FUSE F3

REMOVE CONTROL BOX C

Next: p1639, f1640

FUSE F2

REMOVE CONTROL BOX C

Next: p1643, f1644

TRANSFORMER RESISTANCE

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

Next: !p1647, !f1648

MODE OF FAN OPERATION

Next: p1688, ?1689, ?1691

CONDENSATE PIPE

Next: p1715, !f1716

FAN VOLTAGE CONTROL (PCB)

{GAINPCBACS}
MOVE CONNECTOR ST5 TO EXPOSE TERMINALS ON PCB

Next: p1762, ?1756, ?1758

RESISTANCE SAFETY CIRCUIT

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1693, f1694

AIR PRESSURE SWITCH FITTED

Next: p1703, !f1704

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p1699, !f1700

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1701, !f1702

AIR PRESSURE SWITCH (DEMAND)

Next: p1705, !f1706

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1707, f1708

INLET PRESSURE

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p1717, !f1718

PRESSURE GAS INLET DROP

ATTACH PRESSURE GAUGE TO INLET PRESSURE TEST POINT ON GAS VALVE

Next: p1719, f1720

SPARKING PRESENT TEST

REMOVE SPARK LEADS F

Next: p1731, !f1732

FAN PRESSURE TEST

ATTACH PRESSURE GAUGE TO FAN PRESSURE TEST POINT

Next: !p1727, f1728

ELECTRODE SPARK HARNESS

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

Next: p1733, !f1734

INSPECTION SPARK ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: p1735, !f1736

BURNER INSPECTION

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p1737, !f1738

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1739, !f1740

PUMP HARNESS CONTINUITY

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

Next: !p1745, !f1746

RESISTANCE FAN HARNESS

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

Next: !p1767, !f1768

RESISTANCE FAN HARNESS

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

Next: !p1765, !f1766

RESISTANCE FAN HARNESS

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

Next: !p1763, !f1764

RUN BOILER TO MAX TEMP-DOES OVERHEAT OCCUR

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

Next: p1789, f1801

COOL APPLIANCE

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

Next: p1797, !f1798

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: !p1799, !f1800

RESISTANCE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: p1806, !f1807

RESISTANCE FLUE OH STAT

DISCONNECT ONE OF THE ORANGE LEADS FROM THE OVERHEAT STAT

Next: !p1808, !f1809

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: !p1811, f1812

PUMP HARNESS CONTINUITY

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

Next: !p1824, !f1825

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1830, !f1831

PUMP LIMPET TEST

Next: p1845, f1850

BYPASS - INTERNAL (DHW NOISY)

ENSURE RADS ARE OPEN AND WATER CAN CIRCULATE AROUND
THE SYSTEM

Next: !p1847, !f1848

PUMP HARNESS CONTINUITY

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

Next: !p1853, !f1854

INTERNAL OR EXTERNAL CONTROLS

Next: p1856, f1857

EXTERNAL CONTROLS VOLTAGE (RETURN)

{GAINPCBACS}
EXTERNAL CONTROLS CALLING FOR HEAT

Next: !p1864, f1865

INTERNAL CLOCK

REMOVE AND DISCONNECT THE INTERNAL CLOCK ASSEMBLY FROM THE BOILER.

Next: !p1862, !f1863

DIFFERENTIAL FLOW RETURN

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

Next: !p1869, ?1870, ?1872

INSPECTION HEAT EXCHANGER

REMOVE FAN/MANIFOLD

Next: !p1885, !f1886

VOLTS FROM TURBINE

REMOVE CONTROL BOX COVER IF NECESSARY

Next: p1888, f1889

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1894, f1895

RESISTANCE DHW SENSOR AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: p1898, f1899

VOLTAGE FAN (AT PCB)

MOVE CONNECTOR ST5 U

Next: p1902, ?1904, ?1906

VOLTAGE FAN (PCB DEMAND)

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

Next: p1910, !f1911

RESISTANCE FAN HARNESS

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

Next: !p1908, !f1909

RESISTANCE FAN HARNESS

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

Next: !p1912, !f1913

FAN RUNS

Next: !p1926, !f1927

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR FROM ST9 ON THE PCB

Next: !p1931, f1932

VOLTAGE DIVERTER MOTOR SUPPLY PCB

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

Next: p1941, !f1942

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT THE ST17

Next: !p1943, !f1944

VOLTAGE DIVERTER MOTOR SUPPLY PCB

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

Next: p1951, !f1952

DIVERTER VALVE HARNESS CONTINUITY

DISCONNECT THE ST17

Next: !p1953, !f1954

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, !f1449

FAN SPEED

Next: p653, f654

GAS RATE

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, !f682

PUMP LIMPET TEST

Next: p672, !f697

CH OPERATION

Next: !p704, ?1840, ?1842

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: p1411, !f759

INSPECTION PRESSURE SYSTEM

Next: p683, !f771

PUMP LIMPET TEST

Next: p775, !f776

PRIMARY SENSOR (HIGH FLAME)

REMOVE RED WIRES FRO

Next: p1868, !f778

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, f1945

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: p1788, !f926

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