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:

VOKERA COMPACT / SABRE (NON HE)

GLOBAL PAGE

Next: &1, *

NO FAULT FOUND

Next: nff

CASE REMOVAL

Next: &67, !f3

POWER UP

SELECTOR SWITCH SET TO OFF/RESET

Next: &1142, f68

DHW FLOW RATE

Next: &441, f408

FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

SELECTOR SWITCH SET TO CH/DHW

Next: &759, ?444, ?446, ?448, ?450, ?1389, ?1947

OPERATION DHW

SET SELECTOR SWITCH

Next: &2311, ?760, ?790, ?839, ?872

DHW MODULATION

SET SELECTOR SWITCH

Next: &1613, f1895

OPERATION CH

SELECTOR SWITCH SET TO CH/DHW
FLOW AND RETURN VALVES FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: &1094, ?963, ?965, ?967, ?969, ?971, ?973

CH MODULATION

{CHTEMPCONTMAX}
S

Next: &1138, f1095

OVERRUN PUMP

{CHTEMPCONTMAX}
SELECTOR SWITCH SET TO CH/DHW

Next: &1140, !f1139

ANTI-CYCLE OPERATION (CH ONLY)

{CHTEMPCONTMAX}

Next: &nff, !f1141

BOILER ENTERS STAND-BY MODE

SELECTOR SWITCH SET TO OFF/RESET
ENSURE NO DEMANDS

Next: &2163, ?1144, ?1146, ?1169

OVER HEAT FURTHER INVESTIGATION

Next: &nff, f1185

PUMP RUNS CH DEMAND

{CHTEMPCONTMAX}
SELECTOR SWITCH SET TO CH/DHW POSITION

Next: &962, f1614

JP2 LINK FITTED

Next: &nff, !f1650

BURNER PRESSURE ADJUSTMENT

NOT USED ANYMORE

Next: &nff, !f1652

FURTHER INVESTIGATION FUSE BLOWN

NOT USED

Next: &nff, f1720

LOCKOUT IGNITION/ PRIMARY THERMISTOR

ENSURE BOILER IS COOL
ENSURE NO DEMANDS

Next: &nff, f2354

LOCKOUT LOW PRESSURE/ON WITH NO DEMAND

OK TO BE BLANK

Next: &nff, f2167

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &407, !f2164

DHW THERMISTOR

OK TO BE BLANK

Next: &nff, f2178

DHW BURNER PRESSURE MAX & MIN

SELECTOR SWITCH SET

Next: &883, f2312

BOILER NOISY

PUMP

Next: End

BOILER UPTO TEMP

SYSTEM PRESSURE

Next: End

BOILER TO TEMP RADS COOL

PUMP

Next: End

DHW KETTLING

SENSOR - NTC (DHW)

Next: End

OPERATION CH OK NO REFIRE

SENSOR - NTC (PRIMARY)

Next: End

CH OPERATION BOILER NOISY

SENSOR - NTC (PRIMARY)

Next: End

CH MODULATION

SENSOR - NTC (PRIMARY)

Next: End

PUMP OVER RUN

PCB

Next: End

ANTI-CYCLE

PCB

Next: End

FROST PROTECTION

SENSOR - NTC (PRIMARY)

Next: End

OVERHEAT

THERMOSTAT - HIGH LIMIT

Next: End

BAFFLES OR ROLLS OR LIFT OFF

BURNER

Next: End

CONTAMINATION COMBSTION AIR

FLUE SEALS

Next: End

AIR INTAKE CONTAMINATION

COMBUSTION CHAMBER

Next: End

BOILER TO TEMP

VALVE 22MM - HEATING

Next: End

FAN RUNS

SYSTEM PRESSURE

Next: End

FAN RUNS

ACTUATOR - DHW

Next: End

FAN RUNS

SWITCH - PRESSURE

Next: End

FAN DOES NOT RUN

THERMOSTAT - HIGH LIMIT

Next: End

FAN RUNS APS

KIT - PRESSURE DIFFERENTIAL SWITCH

Next: End

FAN RUNS

SENSOR - NTC (DHW)

Next: End

FAN RUNS

SENSOR - NTC (PRIMARY)

Next: End

BLOWN STANDBY MODE

FUSE MAIN PCB F3

Next: End

MAINS INPUT 1

FUSE MAIN PCB

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

DHW HOT-COLD

GAS SUPPLY

Next: End

DHW HOT-COLD 1

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW HOT-COLD

SENSOR - NTC (DHW)

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR - NTC (DHW)

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

SENSOR - NTC (PRIMARY)

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

THERMOSTAT - HIGH LIMIT

Next: End

OPERATION DHW DHW RUNS HOT THEN COLD

HEAT EXCHANGER DHW

Next: End

HOT-COLD 1

SENSOR - NTC (DHW)

Next: End

DHW KETTLING

GAS SUPPLY

Next: End

DHW NOISY KETTLING 1

SENSOR - NTC (DHW)

Next: End

PUMP

HARNESS - WIRING

Next: End

PUMP RUNS

DHW TAP-LEAK

Next: End

CALIBBRATION

SENSOR - NTC (PRIMARY)

Next: End

INFORMATION

JP2 LINK FITTED

Next: End

GAS VALVE

BURNER PRESSURE ADJUSTMENT

Next: End

PUMP RUNS1

TIMER

Next: End

NEW MODELBLOCKED OR DAMAGED

BURNER

Next: End

GAP DAMAGE

ELECTRODE - SPARK

Next: End

PUMP RUNS 1

TIMER

Next: End

PUMP RUNS 4

TIMER

Next: End

PUMP RUNS 4

Next: End

POWER UP 4

TIMER

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

VALVE - GAS (SOLENOID MODULATING)

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

CH MODULATION

GAS SUPPLY

Next: End

CH MODULATION 2

SENSOR - NTC (PRIMARY)

Next: End

OPERATION CH OK TOO COLD BEFORE REFIRE

VALVE - BYPASS - AUTO

Next: End

CH OPERATION

VALVE - BYPASS - AUTO

Next: End

FAN RUNS BURNER DOES NOT IGNITE

PCB

Next: End

FAN RUNS NO IGNITION

VALVE - GAS (SOLENOID MODULATING)

Next: End

SPARKING NO IGNITION

MODULE - IGNITION & GAS VALVE

Next: End

SPARKING DOES NOT OCCUR

ELECTRODE - SPARK

Next: End

SPARKING OCCURS

ELECTRODE (SPARK GAP)

Next: End

EXTERNAL CONTROLS1

Next: End

FAN RUNS

TIMER

Next: End

EXTERNAL CONTROLS 2

Next: End

FAN RUNS 2

TIMER

Next: End

COMBUSTION MODE

PCB

Next: End

DHW TO HOT1

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW TO HOT

SENSOR - NTC (DHW)

Next: End

DHW MODULATION 1

SENSOR - NTC (DHW)

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

VALVE - GAS (SOLENOID MAIN)

Next: End

SYS TEMP LOW

SENSOR - NTC (PRIMARY)

Next: End

CH LOW

PCB (POTENTIOMETER BURNER ADJUSTMENT)

Next: End

CH MODULATION 2

PCB (POTENTIOMETER BURNER ADJUSTMENT)

Next: End

VOLTAGE OUTPUT SPARK GEN

MODULE - IGNITION

Next: End

INCORRECTLY FITTED

MODULE - IGNITION

Next: End

BURNER DROPS OUT

TUBE - SILICONE

Next: End

BURNER DROPS OUT

KIT - PRESSURE DIFFERENTIAL SWITCH

Next: End

BURNER DROPS OUT

HEAT EXCHANGER PRIMARY

Next: End

BURNER DROPS OUT

FLUE

Next: End

SPARKING DOES NOT OCCUR

MODULE - IGNITION

Next: End

BURNER DROPS OUT

PCB

Next: End

OVERHEAT

SENSOR - NTC (PRIMARY)

Next: End

OVERHEAT

PUMP

Next: End

OVERHEAT

SENSOR - NTC (DHW)

Next: End

OVERHEAT

SYSTEM PRESSURE

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

LOCKOUT LOW PRESSURE

SYSTEM PRESSURE

Next: End

LOCKOUT LOW PRESSURE

SWITCH - PRESSURE

Next: End

FAULT CODES

Z DIRECTION CHOICE OR CONTINUE

Next: End

DHW THERMISTOR FAULT CODE

SENSOR - NTC (DHW)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

SENSOR - NTC (DHW)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

SENSOR - NTC (PRIMARY)

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER

Next: End

DOES NOT ESTABLISH

ELECTRODE - SPARK

Next: End

RESISTANCE SPARK GENERATOR

MODULE - IGNITION

Next: End

BURNER ESTABLISHES

ELECTRODE - SPARK

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS SUPPLY

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

BURNER INJECTOR

Next: End

DHW COOL

GAS SUPPLY

Next: End

DHW COOL 1

SENSOR - NTC (DHW)

Next: End

DHW COOL 2

SENSOR - NTC (DHW)

Next: End

DHW COOL

HEAT EXCHANGER DHW

Next: End

DHW POOR TEMP

KNOB CONTROL

Next: End

BLOCKED OR DAMAGED

VENTURI

Next: End

BLOCKED OR DAMAGED FAN RUNS SPARKING DOES NOT OCCUR

TUBE - SILICONE

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

KIT - PRESSURE DIFFERENTIAL SWITCH

Next: End

FLUEWAYS

HEAT EXCHANGER PRIMARY

Next: End

BLOCKED OR DAMAGED

FLUE

Next: End

OVERHEAT FAULT CODE

ACTUATOR - DHW

Next: End

FIRES NO DEMAND

ACTUATOR - DHW

Next: End

FROST PROTECTION 1

SENSOR - NTC (PRIMARY)

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND 1

VALVE - GAS (SOLENOID MODULATING)

Next: End

MAX VOLTAGE TO MODUREG 1

PCB

Next: End

DHW BURNER PRESSURE MAX & MIN

GAS VALVE - ADJUSTMENT

Next: End

BLOCKED OR DAMAGED

BURNER

Next: End

DHW COOL 2 LPG

SENSOR - NTC (DHW)

Next: End

DHW COOL LPG

HEAT EXCHANGER DHW

Next: End

BLOCKED OR DAMAGED LPG

BURNER

Next: End

BLOCKED OR DAMAGED LPG

BURNER INJECTOR

Next: End

SOLID RED LOCKOUT

SENSOR - NTC (PRIMARY)

Next: End

SOLID RED LOCKOUT

SYSTEM PRESSURE

Next: End

SOLID RED LOCKOUT

SWITCH - PRESSURE

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY

VALVE - BYPASS - AUTO

Next: End

LOCKOUT FLASHING GREEN

THERMOSTAT - HIGH LIMIT

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

POOR FLOW RATE

COCK ADJUSTABLE - COLD WATER INLET

Next: End

FLOW RATE

FLOW - REGULATOR

Next: End

FLOW RATE

ACTUATOR - DHW

Next: End

MECHANICAL PHYSICAL OPERATION

FAN

Next: End

NEW MODEL FLUEWAYS

HEAT EXCHANGER PRIMARY

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

POOR SUPPLY

GAS SUPPLY

Next: End

OPEN OR SHORT CIRCUIT

VALVE - GAS (SOLENOID MAIN)

Next: End

LED AT POWER UP

PCB

Next: End

DHW KETTLING

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

UNDER PRESSURE

EXPANSION VESSEL

Next: End

CPERATION CH OK NO REFIRE FAN RUNS

THERMOSTAT - HIGH LIMIT

Next: End

SYS PRESSURE

PIPE ASSEMBLY - EXPANSION VESSEL

Next: End

CH MODULATION

VALVE - GAS

Next: End

CH MODULATION

PCB

Next: End

FROST PROTECTION

ANTIFROST ACTIVATED

Next: End

FROST PROTECTION

PCB

Next: End

FROST PROTECTION

HARNESS - WIRING

Next: End

OVERHEAT

PCB

Next: End

OVERHEAT

HARNESS - WIRING

Next: End

AIR INTAKE CONTAMINATION

FLUE

Next: End

FAN RUNS

FAN

Next: End

FAN RUNS

HARNESS - WIRING

Next: End

FLOW SWITCH

HARNESS - WIRING

Next: End

FAN RUNS1

HARNESS - WIRING

Next: End

OVERHEAT STAT FAN RUNS

HARNESS - WIRING

Next: End

FAN RUNS

Z DIRECTION CHOICE OR CONTINUE

Next: End

FAN RUNS APS

HARNESS - WIRING

Next: End

HARNESS DHW SENSOR

HARNESS - WIRING

Next: End

FAN RUNS

PCB

Next: End

PRIMARY SENSOR

HARNESS - WIRING

Next: End

FURTHER IN VESTIGATION F3

DIRECTION CHOICE OR CONTINUE

Next: End

MAINS INPUT

HARNESS - WIRING

Next: End

FURTHER INVESTIGATION F2

Z REDIRECTS BY HTML LINK

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

SUPPLY FAULT AT POWER UP

Next: End

DHW HOT-COLD

VALVE - GAS

Next: End

DHW HOT-COLD

PCB

Next: End

DHW HOT THEN COLD

Z REDIRECTS BY HTML LINK

Next: End

BOILER CYCLING OPERATION DHW DHW RUNS HOT THEN COLD

PCB

Next: End

DHW HOT-COLD

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW HOT-COLD 1

PCB

Next: End

DHW KETTLING 1

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW NOISY KETTLING

PCB

Next: End

PUMP RUNS

PUMP

Next: End

PUMP RUNS

ACTUATOR - DHW

Next: End

PUMP RUNS 2

PCB

Next: End

PUMP RUNS 2

HARNESS - WIRING

Next: End

BOCKED OR DAMAGED SPARKING OCCURS BURNER DOESNOT IGNITE

BURNER INJECTOR

Next: End

PUMP RUNS 3

HARNESS - WIRING

Next: End

PUMP RUNS 4

HARNESS - WIRING

Next: End

EXTERNAL CONTROLS 4

Next: End

FUERTER INVESTIGATION FUSE F1 MODULATING SOLENOID

HARNESS - GAS VALVE

Next: End

FURTHER INVESTIGATION FUSE F1

HARNESS - WIRING

Next: End

FURTHER INVESTIGATION FUSE F1 FAN

HARNESS - WIRING

Next: End

POWER UP

PCB

Next: End

FUSE BLOWN

PCB (FUSE BLOWN)

Next: End

CH MODULATION 2

PCB

Next: End

OPERATION CH TOO LONG FOR REFIRECIRCULATION

Next: End

CH OPERATION BOILER UP TO TEMP RADS COLD

Next: End

BOILER UPTO TEMP 2

Next: End

CH OPERATION BOILER UPTO TEMP RADS COLD 2

Next: End

OPERATION CH OK NO REFIRE FAN DOES NOT RUN

PCB

Next: End

BURNER DOES NOT IGNITE

VALVE - GAS (MECHANICAL)

Next: End

SPARKING NO IGNITION

HARNESS - WIRING

Next: End

SPARKING NO IGNITION

MODULE - IGNITION

Next: End

SPARKING NO IGNITION

MODULE IGNITION & GAS VALVE HARNESS

Next: End

SPARKING OCCURS

ELECTRODE - SPARK

Next: End

PCB CH PUMP

PCB

Next: End

CH PUMP 2

PCB

Next: End

PUMP RUNS1

Next: End

PUMP RUNS 2

Next: End

COMBUSTION MODE RESET

Z REDIRECTS BY HTML LINK

Next: End

DHW TOO HOT

DHW TEMPERATURE CONTROL

Next: End

DHW TO HOT

PCB

Next: End

DHW MODULATION 1

PCB

Next: End

FURTHER INVESTIGATION FUSE F1 MAIN SOLENOID 2

HARNESS - GAS VALVE

Next: End

LOW SYSTEM TEMP POT

PCB

Next: End

CH MODULATION

PCB (POTENTIOMETER BURNER ADJUSTMENT)

Next: End

SPARKING DOES NOT OCCURR INPUT CORRECT

TRANSFORMER - IGNITION

Next: End

SPARKING DOES NOT OCCUR

PCB

Next: End

OVERHEAT 1

PCB

Next: End

OVERHEAT 1

THERMOSTAT - HIGH LIMIT

Next: End

OVERHEAT

NORMAL OPERATION

Next: End

LOCKOUT LOW PRESSURE

HARNESS - WIRING

Next: End

FAULT CODES

Z REDIRECTS BY HTML LINK

Next: End

DHW THERMISTOR FAULT CODE

PCB

Next: End

DHW THERMISTOR FAULT CODE

HARNESS - WIRING

Next: End

BURNER IGNITES DOES NOT ESTABLISH

MODULE - IGNITION

Next: End

DOES NOT ESTABLISH

TRANSFORMER - IGNITION

Next: End

DOES NOT ESTABLISH

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW COOL

VALVE - GAS (PRESSURE GAS BURNER ADJUSTMENT)

Next: End

DHW COOL

PCB

Next: End

DHW COOL 1

PCB

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

FAN

Next: End

OVERHEAT FAULT CODE

HARNESS - WIRING

Next: End

FIRES NO DEMAND

HARNESS - WIRING

Next: End

FROST PROTECTION 1

ANTIFROST ACTIVATED

Next: End

FROST PROTECTION 1

PCB

Next: End

FROST PROTECTION 1

HARNESS - WIRING

Next: End

UNABLE TO SET UP MINIMUM 1

VALVE - GAS

Next: End

DHW TOO COOL RADIATORS COOL WITH NO CH DEMAND 1

HARNESS - WIRING

Next: End

FAULTY MAX ADJUSTMENT 1

VALVE - GAS

Next: End

DHW BURNER PRESSURE MAX & MIN

Z DIRECTION CHOICE OR CONTINUE

Next: End

BLOCKED OR DAMAGED

BURNER INJECTOR

Next: End

DHW COOL 1 LPG

PCB

Next: End

BURNER DROPS OUT

MODULE - IGNITION

Next: End

SOLID RED LOCKOUT - PRIMARY SENSOR

HARNESS - WIRING

Next: End

SOLID RED LOCKOUT

PCB

Next: End

SOLID RED LOCKOUT - LWPS

HARNESS - WIRING

Next: End

BURNER DROPS OUT

VENTURI

Next: End

BURNER DROPS OUT

FAN

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

LOCKOUT FLASHING GREEN

HARNESS - WIRING

Next: End

LOCKOUT LOW PRESSURE

PCB

Next: End

POOR FLOW RATE

HEAT EXCHANGER DHW

Next: End

FLAME LIFT OFF

FLUE SEALS

Next: End

FURTHER INVESTIGATION FUSE F1 MAIN SOLENOID

HARNESS - GAS VALVE

Next: End

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

Z REDIRECTS BY HTML LINK

Next: End

DHW TO HOT2

VALVE - GAS

Next: End

DHW KETTLING

PCB

Next: End

DHW KETTLING

HEAT EXCHANGER PRIMARY

Next: End

OPERATION CH OPERATION OK GOES TO OVER HEAT

Z REDIRECTS BY HTML LINK

Next: End

PUMP RUNS (NO DEMAND)

CHARACTERISTIC TEST FROM BOILER ENTERS STAND-BY MODE

Next: p1148

BOILER FIRES (NO DEMAND)

CHARACTERISTIC TEST FROM BOILER ENTERS STAND-BY MODE

Next: p1640

LED FAULT CODE SHOWN

CHARACTERISTIC TEST FROM BOILER ENTERS STAND-BY MODE

Next: p2174

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1391

BURNER IGNITES AND ESTABLISHES BUT DROPS OUT, ATTEMPTS REIGNITION STRAIGHTAWAY

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1963

BOILER OVERHEATS BEFORE 85°C IS REACHED

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p2158

BOILER REACHES TEMPERATURE AND SHUTS DOWN CORRECTLY

CHARACTERISTIC TEST FROM OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

Next: !p2160

UNABLE TO SET MINIMUM

CHARACTERISTIC TEST FROM SETTING UP MAX & MIN BURNER PRESSURES

Next: !p2315

UNABLE TO SET MAXIMUM

CHARACTERISTIC TEST FROM SETTING UP MAX & MIN BURNER PRESSURES

Next: p2317

UNABLE TO GAS RATE (EG LPG INSTALLATION)

Next: p2333

GAS RATE INCORRECT

Next: p2330

VENTURI UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2369

FAN UNSATISFACTORY

CHARACTERISTIC TEST FROM INSPECTION FAN AND VENTURI

Next: !p2371

TEMP DIFF CORRECT LOCAL BOILING

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

Next: !p2378

DIFFERENTIAL OK

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

Next: !p2380

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1811

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p729

BURNER IGNITES BUT DOES NOT ESTABLISH (SPARKING CONTINUES UNTIL LOCKOUT)

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p2183

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p451

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1888

DHW COOL / TEMP RISE POOR

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2253

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p856

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1533

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1023

BOILER UP TO TEMPERATURE BUT RADIATORS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1040

BOILER AND SYSTEM TEMPERATURE LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1047

SYSTEM HEATS SATISFACTORILY BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p970

SYSTEM HEATS SATISFACTORILY BUT THEN GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p972

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p974

21/03/2022 15:58:37 2203_1_50_1 01/06/2022 12:28:31

26/05/2022 13:40:56

Next: End

EXTERNAL CONTROLS (IN)

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1457, f1669

PRESSURE GAS BURNER (CH MAX)

{CHTEMPCONTMAX}
S

Next: p1096, f1097

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: p1755, !f1756

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: !p1104, !f1136

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: !p1151, f1152

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: !p1153, !f1154

BOILER RESET

ENSURE BOILER IS COOL

Next: p1197, f1190

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: !p1191, f1192

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE CONNECTOR FROM THE OVERHEAT STAT

Next: !p1193, !f1194

INSPECTION FLUE SEALS

Next: p1230, !f1231

VOLTAGE FAN POWER (AT PCB)

SELECTOR SWITCH TO CH/DHW

Next: !p1394, f1395

SYSTEM PRESSURE

Next: p1396, !f1397

RESISTANCE FLOW SWITCH

REMOVE LEADS FROM DHW FLOW SWITCH
DHW FLOW SWITCH IS LOCATED BOTTOM RIGHT HAND SIDE OF BOILER

Next: !p1400, !f1401

RESISTANCE SWITCH-PRESSURE

DISCONNECTED LEADS TO LOW WATER PRESSURE SWITCH

Next: !p1404, !f1405

RESISTANCE OVERHEAT STAT

DISCONNECT CONNECTOR TO OVERHEAT STAT

Next: !p1408, f1409

OVERHEAT FURTHER INVESTIGATION

Next: !p1410, !f1411

RESISTANCE AIR PRESSURE SWITCH (NO AIR)

REMOVE AND DISCONNECT THE LEADS FROM THE AIR PRESSURE SWITCH
MAKE A NOTE OF THEIR POSITIONS

Next: !p1414, !f1415

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1418, !f1419

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: !p1422, !f1423

VOLTAGE MAINS POWER INPUT TO APPLIANCE (TERMINAL BLOCK)

REMOVE CONTROL BOX COVER

Next: p1474, f1448

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p1489, f70

FUSE FURTHER INVESTIGATION F3

Next: !p1460, !f1461

FUSE FURTHER INVESTIGATION F2

Next: !p1477, !f1478

PRESSURE GAS BURNER MAXIMUM

DHW TEMPERATURE CONT

Next: p1536, f1537

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: p1556, !f1539

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1544, !f1545

OVERHEAT FURTHER INVESTIGATION

Next: !p1552, !f1553

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1560, !f1561

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1566, !f1567

VOLTAGE PUMP AT (PCB)

SELECTOR SWITCH SET TO CH/DHW

Next: p1615, f1616

EXTERNAL CONTROLS (IN)

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p1631, f1683

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: !p1638, !f1639

EXTERNAL CONTROLS FITTED?

Next: p1670, f1853

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1672, !f1673

EXTERNAL CONTROLS FITTED?

Next: p1684, f1858

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1686, !f1687

EXTERNAL CONTROLS FITTED?

Next: p1694, f1695

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1696, !f1697

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT PLUG MARKED CN5 FROM THE PCB

Next: p1721, f1722

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEAD FROM THE GAS VALVE

Next: !p1898, !f1899

RESISTANCE GAS VALVE SOLENOID MODULATING

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p1739, !f1728

RESISTANCE PUMP

REMOVE THE PUMP COVER
DISCONNECT THE ELECTRICAL CONNECTIONS TO THE PUMP

Next: !p1740, !f1732

RESISTANCE FAN

REMOVE ELECTRICAL CONNECTIONS TO FAN ASSEMBLY

Next: !p1741, !f1736

RESISTANCE GAS VALVE AND HARNESS (PCB)

DISCONNECT PLUG MARKED CN5 FROM THE PCB

Next: !p1801, f1744

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEAD FROM THE GAS VALVE

Next: !p1803, !f1802

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: !p1759, !f1760

INSPECTION AUTO BYPASS

FLOW AND RETURN VALV

Next: !p1769, !f1764

INSPECTION AUTO BYPASS

FLOW AND RETURN VALV

Next: !p1767, !f1768

RESISTANCE GAS VALVE SOLENOID MODULATING

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p1799, !f1800

LINK INTEGRAL CLOCK

FIT A WIRE LINK BETWEEN THE TERMINALS ILLUSTRATED

Next: !p1857, f1671

LINK INTEGRAL CLOCK

FIT A WIRE LINK BETWEEN THE TERMINALS ILLUSTRATED

Next: !p1862, f1685

PRESSURE GAS BURNER MINIMUM

DHW TEMPERATURE CONT

Next: p1891, !f1892

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1896, !f1897

OBSERVATION - IS IGNITION PCB FITTED ON TO THE MAIN PCB

GAIN ACCESS TO PCB

Next: p1909, !f1929

RESISTANCE BETWEEN IGNITION PCB CONNECTING PINS

REMOVE THE IGNITION PCB

Next: !p1961, !f1962

SYSTEM PRESSURE

Next: p2168, !f2169

RESISTANCE SWITCH-PRESSURE

DISCONNECTED LEADS TO LOW WATER PRESSURE SWITCH

Next: !p2172, !f2173

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR CN9 FROM THE PCB

Next: !p2179, f2180

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p2181, !f2182

INSPECTION ELECTRODE SPARK GAP

REMOVE BURNER INSULATION COVER

Next: p2236, !f2237

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: !p2243, !f2244

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: p2257, !f2258

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p2261, !f2262

INSPECTION VENTURI

WITH FAN REMOVED REMOVE THE FAN VENTURI (LOCATED IN FAN OUTLET)

Next: p2273, !f2274

RESISTANCE FLOW SWITCH

REMOVE LEADS FROM DHW FLOW SWITCH
DHW FLOW SWITCH IS LOCATED BOTTOM RIGHT HAND SIDE OF BOILER

Next: !p2298, !f2299

RESISTANCE DHW FLOW SWITCH AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p2304, f2301

RESISTANCE FLOW SWITCH

REMOVE LEADS FROM DHW FLOW SWITCH
DHW FLOW SWITCH IS LOCATED BOTTOM RIGHT HAND SIDE OF BOILER

Next: !p2302, !f2303

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: !p2307, f2308

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: !p2309, !f2310

SETTING UP MAX & MIN BURNER PRESSURES

SELECTOR SWITCH SET

Next: p2313, ?2314, ?2316

RESISTANCE GAS VALVE SOLENOID MODULATING

REMOVE THE LEADS FROM THE GAS VALVE

Next: !p2320, !f2321

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: p2360, f2356

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: !p2357, !f2358

RESISTANCE SWITCH-PRESSURE

DISCONNECTED LEADS TO LOW WATER PRESSURE SWITCH

Next: !p2365, !f2366

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE CONNECTOR FROM THE OVERHEAT STAT

Next: !p2385, !f2386

INSPECTION SERVICE VALVE

Next: p409, !f410

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p69, f1441

FUSE FURTHER INVESTIGATION F1

Next: !p1488, !f1487

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: p732, !f733

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE LEAD FROM THE GAS VALVE

Next: !p737, !f738

PRESSURE GAS BURNER MAXIMUM

DHW TEMPERATURE CONT

Next: p859, f860

PRESSURE GAS INLET

ATTACH PRESSURE GAU

Next: p1562, !f1563

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p867, !f1078

INSPECTION BYPASS INTEGRAL

{CHTEMPCONTMAX}
E

Next: !p1761, f1762

PUMP LIMPET TEST

Next: p1024, !f1025

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: p2372, !f1085

SYSTEM PRESSURE

Next: p1234, !f1042

PUMP LIMPET TEST

Next: p1043, !f1044

INSPECTION BYPASS INTEGRAL

{CHTEMPCONTMAX}
E

Next: !p1765, f1766

PRESSURE GAS BURNER CH (MAX)

{CHTEMPCONTMAX}
S

Next: p1900, !f1905

PRESSURE GAS BURNER (CH MIN)

{CHTEMPCONTMAX}
S

Next: p1100, !f1907

VOLTAGE GAS VALVE CH (GV2 MODULATING SOLENOID AT GV)

{CHTEMPCONTMAX}
SET SELECTOR SWITCH TO CH/DHW

Next: !p1102, f1103

ANTI-FROST PROTECTION (BELOW 7 DEGREES)

CONNECT TEMP PROBE TO PIPE WORK JUST BELOW FLOW THERMISTOR

Next: !p1149, f1150

SYSTEM PRESSURE

Next: p2283, !f2162

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p458, !f1222

INSPECTION COMBUSTION CHAMBER

REMOVE COMBUSTION FRONT INSULATION COVER

Next: !p1232, !f1233

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1041, !f1240

VOLTAGE FAN POWER (AT FAN)

SELECTOR SWITCH SET TO CH/DHW

Next: !p1392, f1393

RESISTANCE DHW FLOW SWITCH AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p1398, f1399

RESISTANCE SWITCH- PRESSURE AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p1402, f1403

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: p1406, f1407

RESISTANCE APS AND HARNESS (NO AIR)

DISCONNECT CN9 FROM THE PCB

Next: p1412, f1413

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR CN9 FROM THE PCB

Next: p1416, f1417

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: !p1420, f1421

RESISTANCE FUSE F3 ( APPLIANCE)

REMOVE FUSE FROM PCB

Next: !p1753, f1459

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE FUSE FROM TERMINAL BLOCK CONNECTOR

Next: !p1475, f1476

PRESSURE GAS BURNER (MODULATION)

SET SELECTOR SWITCH

Next: p1534, f1535

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: p1546, !f1547

PRESSURE GAS BURNER MINIMUM

DHW TEMPERATURE CONT

Next: p1540, !f1541

VOLTAGE GAS VALVE (GV2 MODULATING SOLENOID AT GV)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p1542, f1543

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: p1548, !f1549

RESISTANCE SENSOR OVERHEAT STAT

DISCONNECT THE CONNECTOR FROM THE OVERHEAT STAT

Next: p1550, f1551

INSPECTION HEAT EXCHANGER DHW

TURN OFF DHW INLET I

Next: !p1554, !f1555

VOLTAGE GAS VALVE (GV2 MAX PRESSURE)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p1559, f1558

VOLTAGE GAS VALVE (GV2 MAX PRESSURE)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p1564, f1565

VOLTAGE PUMP AT (PUMP)

{CHTEMPCONTMAX}
SELECTOR SWITCH SET TO CH/DHW
REMOVE PUMP COVER

Next: !p1629, !f1630

DHW ISOLATION VALVE

{CHTEMPCONTMAX}
SET SELECTOR SWITCH TO CH/DHW
ISOLATE THE COLD MAINS SUPPLY TO THE BOILER

Next: !p1635, !f1636

DHW FLOW SWITCH

{CHTEMPCONTMAX}
S

Next: p1617, f1637

COMBUSTION TEST MODE

SELECTOR SWITCH SET TO OFF/RESET

Next: p1871, f2300

LINK EXTERNAL CONTROLS

{CHTEMPCONTMAX}
FIT A WIRE LINK BETWEEN THE TERMINALS ILLUSTRATED

Next: p1863, !f1864

LINK EXTERNAL CONTROLS

{CHTEMPCONTMAX}
FIT A WIRE LINK BETWEEN THE TERMINALS ILLUSTRATED

Next: p1867, !f1868

VOLTAGE EXTERNAL CONTROLS

HINGE DOWN THE PCB

Next: p1698, !f1699

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1700, !f1701

RESISTANCE GAS VALVE SOLENOID MODULATING AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p1725, f1726

RESISTANCE PUMP AND HARNESS

DISCONNECT PLUG MARKED CN2 FROM PCB

Next: p1729, f1730

RESISTANCE FAN AND HARNESS

DISCONNECT PLUG MARKED CN4 FROM THE PCB

Next: !p1754, f1734

VOLTAGE GAS VALVE CH (GV2 MAX PRESSURE)

{CHTEMPCONTMAX}
SET SELECTOR SWITCH TO CH/DHW

Next: !p1906, f1758

VOLTAGE GAS VALVE (GV2 MAX PRESSURE)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: p734, !f1792

RESISTANCE GAS VALVE SOLENOID MODULATING AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: !p1796, f1795

SPARK GENERATOR OUTPUT (SPARK TEST)

REMOVE ELECTRODE LEA

Next: p1812, f1908

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1832, !f1833

INSPECTION ELECTRODE AND GAP

REMOVE BURNER INSULATION COVER

Next: !p1834, !f1835

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1865, !f1866

RESISTANCE INTEGRAL CLOCK

HINGE DOWN PCB
DISCONNECT THE TWO LEADS FROM THE TIMERS MICRO SWITCH ASSY.

Next: !p1869, !f1870

COMBUSTION MODE RESET

REMOVE THE SELECTOR CONTROL KNOB

Next: !p1872, !f1873

PRESSURE GAS BURNER (MODULATION)

SET SELECTOR SWITCH

Next: !p1889, f1890

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: !p1893, !f1894

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: !p1901, !f1902

RESISTANCE BETWEEN IGNITION PCB AND MAIN PCB CONNECTING PINS

Next: p1911, f1928

VOLTAGE IGNITION PCB INPUT

DHW TEMPERATURE CONTROL TO MAX

Next: p1912, f2272

VOLTAGE SPARK GENERATOR INPUT

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p1926, !f1927

INSPECTION FAN AND VENTURI

REMOVE FAN AND THE FAN VENTURI (LOCATED IN FAN OUTLET)

Next: p1951, ?2368, ?2370

INSPECTION TUBES AIR PRESSURE

REMOVE AIR PRESSURE SWITCH TUBE

Next: p1952, !f1953

AIR PRESSURE SWITCH PROVING

DISCONNECT LEADS FRO

Next: p1954, !f1955

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE BURNER FRONT INSULATION PANEL
(REFER TO ADAPT FOR GUIDANCE)

Next: p1956, !f1957

INSPECTION FLUE

Next: !p2350, !f1959

VOLTAGE AT FAN (CONSTANT)

SELECTOR SWITCH SET TO CH/DHW POSITION
BOILER DHW THERMOSTAT SET TO MAX

Next: p1948, !f1975

RESISTANCE SENSOR TEMP FLOW AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: p2110, !f2124

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR CN9 FROM THE PCB

Next: p2155, !f2161

PUMP LIMPET TEST

Next: p2095, !f2154

OBSERVATION DOES OVERHEAT OCCUR AT MAX TEMPERATURE

{CHTEMPCONTMAX}
S

Next: !p2156, ?2157, ?2159

RESISTANCE SWITCH- PRESSURE AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p2382, f2171

ENHANCED FAULT CODES

Next: !p2176, !f2175

PRESSURE GAS BURNER MAXIMUM

DHW TEMPERATURE CONT

Next: p2226, f2242

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: p2227, !f2228

RESISTANCE SENSOR TEMP PRIMARY

DISCONNECT CONNECTOR FROM PRIMARY SENSOR

Next: p2229, !f2230

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p2231, !f2232

INSPECTION BURNER MANIFOLD

REMOVE BURNER ASSEMBLY AND BURNER MANIFOLD

Next: p2233, !f2245

VOLTAGE RECTIFICATION

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p2234, f2235

RESISTANCE SPARK GENERATOR (ELECTRODE SENSE)

DISCONNECT CN6 FROM PCB

Next: p2238, !f2239

RESISTANCE ELECTRODE SPARK HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p2240, !f2241

INSPECTION DHW TEMPERATURE CONTROL

GAIN ACCESS TO THE PCB

Next: p2254, !f2271

PRESSURE GAS BURNER MAXIMUM

DHW TEMPERATURE CONT

Next: p2255, f2256

GAS RATE

Next: p2263, ?2326, ?2328

VOLTAGE GAS VALVE (GV2 MAX PRESSURE)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p2259, f2260

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: p2267, !f2268

INSPECTION HEAT EXCHANGER DHW

TURN OFF DHW INLET I

Next: !p2269, !f2270

INSPECTION TUBES AIR PRESSURE

REMOVE AIR PRESSURE SWITCH TUBE

Next: p2275, !f2276

AIR PRESSURE SWITCH PROVING

DISCONNECT LEADS FRO

Next: p2277, !f2278

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE BURNER FRONT INSULATION PANEL
(REFER TO ADAPT FOR GUIDANCE)

Next: p2279, !f2280

INSPECTION FLUE

Next: !p2281, !f2282

RESISTANCE DHW FLOW SWITCH AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p2140, f2297

ANTI-FROST PROTECTION (BELOW 5 DEGREES)

CONNECT TEMP PROBE TO PIPE WORK JUST BELOW FLOW THERMISTOR

Next: !p2305, f2306

MIN & MAX BURNER PRESSURES CORRECTLY ADJUSTED

Next: !p2324, !f2325

RESISTANCE GAS VALVE SOLENOID MODULATING AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: p2318, f2319

VOLTAGE GAS VALVE (GV2 MAX PRESSURE)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p2322, !f2323

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: !p2331, !f2332

RESISTANCE SENSOR TEMP DHW

DISCONNECT CONNECTOR FROM DHW SENSOR

Next: p2334, !f2335

INSPECTION HEAT EXCHANGER DHW

TURN OFF DHW INLET I

Next: p2336, !f2337

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: p2338, !f2339

INSPECTION BURNER MANIFOLD

REMOVE BURNER ASSEMBLY AND BURNER MANIFOLD

Next: !p2340, !f2341

SYSTEM PRESSURE

Next: p2361, !f2362

RESISTANCE SWITCH- PRESSURE AND HARNESS

DISCONNECT CN9 FROM THE PCB

Next: !p2363, f2364

INSPECTION BYPASS INTEGRAL

{CHTEMPCONTMAX}
E

Next: p2373, !f2374

TEMPERATURE DIFFERENTIAL FLOW RETURN

Next: !p2375, ?2377, ?2379

RESISTANCE OVERHEAT STAT AND HARNESS

DISCONNECT CONNECTOR CN8 FROM THE PCB

Next: !p2387, f2384

DHW FLOW LIMITER

ISOLATE COLD MAINS I

Next: p411, !f412

INSPECTION FLOW SWITCH ASSEMBLY

ISOLATE COLD MAINS I

Next: !p413, !f414

DID BURNER BAFFLE OR ROLL DOWN OR LIFT OFF

SELECTOR SWITCH SET TO CH/DHW

Next: p452, f1229

INSPECTION FAN MECHANICAL

REMOVE FAN

Next: p1216, !f459

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE BURNER FRONT INSULATION PANEL
(REFER TO ADAPT FOR GUIDANCE)

Next: p460, !f461

INSPECTION FLUE

Next: !p462, !f463

BOILER OPERATES CH DEMAND

{CHTEMPCONTMAX}
SELECTOR SWITCH SET TO CH/DHW

Next: p75, f105

PRESSURE GAS BURNER

DHW TEMPERATURE CONT

Next: p730, f731

INSPECTION ELECTRODE AND GAP

REMOVE BURNER INSULATION COVER

Next: p739, !f1681

VOLTAGE GAS VALVE (AT PCB)

SELECTOR SWITCH SET TO CH/DHW
DHW TEMPERATURE CONTROL SET TO MAX

Next: p1786, f1742

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT PLUG MARKED CN5 FROM THE PCB

Next: p1793, f736

INSPECTION BURNER

REMOVE BURNER ASSEMBLY

Next: !p1682, !f1680

FURTHER INVESTIGATION LED PROBLEM

Next: !p83, !f84

PRESSURE GAS BURNER (MODULATION)

SET SELECTOR SWITCH

Next: !p871, f858

PRESSURE GAS BURNER MINIMUM

DHW TEMPERATURE CONT

Next: p863, !f864

VOLTAGE GAS VALVE (GV2 MODULATING SOLENOID AT GV)

SET SELECTOR SWITCH TO CH/DHW
DHW TEMPERATURE CONTROL TO MAX

Next: !p865, f866

BOILER RESET

{CHTEMPCONTMAX}

Next: !p987, !f988

EXTERNAL CONTROLS (IN)

GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p977, f1693

EXPANSION VESSEL PRESSURE

CLOSE FLOW AND RETURN ISOLATION VALVES
DISCHARGE PRIMARY SYSTEM WATER

Next: !p1082, !f976

TEMPERATURE SYSTEM FLOW

SET SELECTOR SWITCH

Next: p979, f980

RESISTANCE SENSOR TEMP FLOW

DISCONNECT PLUG FROM PRIMARY SENSOR

Next: !p1772, !f1084

System Information

  • Total Tests: 508
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control