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:

4758324 BIASI RIVA PLUS HE M296 24SM/C

WARNING - IMPORTA

Next: &1, *

NO FAULT FOUND

Next: nff

4758324 BIASI RIVA PLUS HE M296 24SM/C

Next: &2133, !f2

TYPE OF DIAGNOSTIC PROCEDURE

Next: &1142, !f4

POWER UP

ON/OFF SWITCH ON

Next: &50, f29

DHW FLOW RATE

Next: &132, f51

DHW FAN RUNS

Next: &193, f113

DHW DEMAND

Next: &138, f133

DHW PUMP RUNS

Next: &81, f159

FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

ATTACH "U"GAUGE TO OUTLET PRESSURE TEST POINT
ON / OFF SWITCH ON

Next: &286, ?196, ?198, ?200, ?202

OPERATION DHW

Next: &1666, ?287, ?289, ?291, ?293, ?295

OPERATION CH

FLOW AND RETURN VALVES FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: &1668, ?597, ?599, ?601, ?603, ?605, ?607

DOES BOILER RESPOND TO CH DEMAND

CH THERMOSTAT UP TO MAX ON BOILER
ON/OFF SWITCH ON

Next: &596, f659

FURTHER INVESTIGATION OVERHEAT

Next: &nff, f1909

FURTHER INVESTIGATION FUSE

Next: &nff, ?980, ?982

OPERATIONAL SEQUENCE

Next: &1144, !f1143

FAULT CODES

Next: &28, !f1145

PRIMARY FAULTY SENSOR LOCKOUT

OUTSIDE MODEL OK TO BE BLANK

Next: &nff, f1467

DHW FAULTY SENSOR LOCKOUT

Next: &nff, f1479

FLUE TEMP NTC LOCKOUT

Next: &nff, f1485

FLUE SENSOR FAULTY LOCKOUT

Next: &nff, f1506

PRIMARY FLOW FAULTY

OK TO BE BLANK, CHARACTERISTICS USED AS A HEADER.

Next: &nff, ?1517, ?1519

AIR PRESSURE SENSOR FAULT

Next: &nff, f1600

SAFETY OVERHEAT LOCKOUT

OUTSIDE MODEL

Next: &nff, f1806

DOES FAN AND PUMP OVERRUN AFTER DHW DEMAND

SELECTOR SWITCH TO HW

Next: &658, !f1667

DOES PUMP AND FAN OVERRUN AFTER CH DEMAND

Next: &nff, !f1669

BOILER FIRES WITH NO DEMAND

OUTSIDE MODEL

Next: &nff, f2093

INFORMATION SERIAL NUMBER DEPENDENT XSOL MODEL

PLEASE NOTE THIS XSO

Next: &3, !f2134

HARNESS - FAN/APS/FLUE NTC

HARNESS - FAN/APS/FLUE NTC

Next: End

FLUEWAYS

HEAT EXCHANGER CONDENSING

Next: End

NO FAN

SENSOR TEMP PRIMARY

Next: End

NO FAN

SENSOR TEMP DHW

Next: End

POOR DHW RADS HOT NO DEMAND

HEAT EXCHANGER DHW

Next: End

DHW KETTLING

TRAP - CONDENSATE

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

GAS VALVE SOLENOID MAIN

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1

GAS VALVE SOLENOID MODULATING

Next: End

FURTHER INVESTIGATION FUSE F1

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1

FAN

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1F1 OR F2 ON PCB

GAS VALVE SOLENOID MAIN

Next: End

OPEN OR SHORT CIRCUITFURTHER INVESTIGATION FUSE F1F1 OR F2 ON PCB

GAS VALVE SOLENOID MODULATING

Next: End

FURTHER INVESTIGATION FUSE F1F1 OR F2 ON PCB

PUMP

Next: End

FURTHER INVESTIGATION FUSE F1F1 OR F2 ON PCB

FAN

Next: End

OPERATIONAL SEQUENCE

DIRECTION CHOICE OR CONTINUE

Next: End

FAULT CODES

DIRECTION CHOICE OR CONTINUE

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFF

HEAT EXCHANGER CONDENSING

Next: End

FURTHER INVESTIGATION F1

DIVERTER VALVE HEAD

Next: End

FURTHER INVEST F2&3

DIVERTER VALVE HEAD

Next: End

DHW HOT THEN COLD

SENSOR TEMP DHW

Next: End

DHW RUNS HOT THEN COLD

SENSOR TEMP PRIMARY

Next: End

NO DHW PUMPDHW PUMP RUNS

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

DHW DEMAND

DHW FLOW SWITCH

Next: End

NO DHW PUMPNO DHW PUMP

SENSOR TEMP PRIMARY

Next: End

NO PUMP DHWNO DHW PUMP

SENSOR TEMP DHW

Next: End

NO PUMP DHWNO DHW PUMP

FLUE NTC PROBE

Next: End

NO PUMPNO DHW PUMP

THERMOSTAT - OVERHEAT - COMBUSTION CHAMBER

Next: End

NO PUMPNO DHW PUMP

SAFETY OVERHEAT STAT

Next: End

NO PUMPNO DHW PUMP

SYSTEM PRESSURE

Next: End

NO PUMPNO DHW PUMP

HARNESS - FAN/APS/FLUE NTC

Next: End

DHW PUMP RUNS

PUMP

Next: End

INCORREST RESISTANCES

PUMP

Next: End

CH LOCKOUT

SENSOR TEMP PRIMARY

Next: End

NO PUMP DHWNO DHW PUMPDHW LOCKOUTDHW LOCKOUT

SENSOR TEMP DHW

Next: End

COOL DHWDHW HOT THEN COLDFLUE SENSOR LOCKOUT

TRAP - CONDENSATE

Next: End

FLUE PROBEDHW HOT THEN COLDFLUE SENSOR LOCKOUT

FLUE

Next: End

DHW HOT THEN COLDFLUE SENSOR LOCKOUT

FLUE NTC PROBE

Next: End

FAULTY FLUE NTC

FLUE NTC PROBE

Next: End

PRIMARY CIRCUIT FAULTY

SYSTEM PRESSURE

Next: End

LOCKOUT PRIMARY CIRCUIT FAULTY

PRIMARY CIRCUIT PRESSURE SWITCH

Next: End

NO DHW PUMPDHW PUMP RUNSPRIMARY CIRCUIT FAULTY2

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

DHW PUMP RUNSPRIMARY CIRCUIT FAULTY2

PUMP

Next: End

INCORREST RESISTANCESPRIMARY CIRCUIT FAULTY2

PUMP

Next: End

DHW HOT THEN COLDFAULTY PRIMARY CIRCUIT

PUMP

Next: End

DHW HOT THEN COLDFAULTY PRIMARY CIRCUIT

SENSOR TEMP DHW

Next: End

DHW RUNS HOT THEN COLDFAULTY PRIMARY CIRCUIT

SENSOR TEMP PRIMARY

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFFFAULTY PRIMARY CIRCUIT

HEAT EXCHANGER CONDENSING

Next: End

FAULTY PRIMARY CIRCUIT

PCB

Next: End

FAULTY AIR PRESSURE

HARNESS - FAN/APS/FLUE NTC

Next: End

FAN DOESNT RUN

Z DIRECTION CHOICE OR CONTINUE

Next: End

BOILER GOES TO OVERHEATOVERHEAT

SAFETY OVERHEAT STAT

Next: End

OVERHEATOVERHEAT

THERMOSTAT - OVERHEAT - COMBUSTION CHAMBER

Next: End

NO DHW DEMAND

DHW FLOW SWITCH

Next: End

BOILER TO TEMP RADS COLD

BYPASS (INTEGRAL APPLIANCE)

Next: End

FLOW AND RETURN VALVES

FLOW AND RETURN VALVES

Next: End

NO DHW OVERUN

PCB

Next: End

CH OVERUN

PCB

Next: End

NO SPARK

HARNESS IGNITION

Next: End

NO FAN

SYSTEM PRESSURE

Next: End

BURNER IGNITES

ELECTRODE SENSE

Next: End

BURNERIGNITES

CABLE - ELECTRODE FLAME DETECTION

Next: End

POSITION

ELECTRODE SENSE

Next: End

BURNER LIGHTS DOESNT ESTABLISH

BURNER

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

FLUE

Next: End

BURNER IGNITES BUT DOES NOT ESTABLISH

GAS PRESSURE INLET

Next: End

CANNOT BE ADJUSTED HW HOT THEN COLD

GAS VALVE SOLENOID MODULATING

Next: End

NO CH MODULATION

PCB

Next: End

BOILER TEMP LOW SYSTEM TEMP LOW

SENSOR TEMP PRIMARY

Next: End

IMPELLOR LOOSE

PUMP

Next: End

OVERHEATOVERHEAT FURTHER

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISEOVERHEATOVERHEAT FURTHER

Next: End

OVERHEATOVERHEAT FURTHER

SENSOR TEMP PRIMARY

Next: End

OVERHEATOVERHEAT FURTHER

SENSOR TEMP DHW

Next: End

OVERHEATOVERHEAT FURTHER

THERMOSTAT - OVERHEAT - COMBUSTION CHAMBER

Next: End

OVERHEATOVERHEAT FURTHER

SAFETY OVERHEAT STAT

Next: End

NO AIR PRESSURE

HEAT EXCHANGER PRIMARY FLUE WAYS BAFFLES

Next: End

BOILER GOES TO OVERHEAT

SAFETY OVERHEAT STAT

Next: End

OVERHEAT

THERMOSTAT - OVERHEAT - COMBUSTION CHAMBER

Next: End

NO SHUT DOWN

GAS VALVE

Next: End

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

NO POWER TO GAS VALVE

PCB

Next: End

COMBUSTION CHAMBER OVERHEAT

TRAP - CONDENSATE

Next: End

OVERHEAT

BURNER

Next: End

OVERHEAT

HEAT EXCHANGER PRIMARY FLUE WAYS BAFFLES

Next: End

OVERHEAT COMBUSTION CHAMBER

FLUE

Next: End

CASE REMOVAL

DIRECTION CHOICE OR CONTINUE

Next: End

DHW COOL RADS COOL

PUMP

Next: End

DHW FAN RUNS

FLUE NTC PROBE

Next: End

DHW FAN RUNS NOT

HARNESS - FAN/APS/FLUE NTC

Next: End

DHW FAN RUNS

TUBE IMPULSE AIR PRESSURE

Next: End

NO VOLTAGE TO APS

PCB

Next: End

CANNOT BE ADJUSTED HW TOO HOT

GAS VALVE SOLENOID MODULATING

Next: End

DHW TOO HOT

SENSOR TEMP DHW

Next: End

DHW TOO HOT

SENSOR TEMP PRIMARY

Next: End

CONTAMINATION COMBSTION AIR

FLUE SEALS

Next: End

DHW COOL RADS COLD NO DEMAND

SENSOR TEMP DHW

Next: End

DHW COOL RADS COLD NO DEMAND

SENSOR TEMP PRIMARY

Next: End

COOL DHW

TRAP - CONDENSATE

Next: End

DHW COOL RADS COLD NO DEMAND

FLUE

Next: End

POOR DHW

BYPASS (INTEGRAL APPLIANCE)

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER DHW

Next: End

AIR INTAKE CONTAMINATION

COMBUSTION CHAMBER

Next: End

SYSTEM FAULT

Next: End

FROST

SENSOR TEMP PRIMARY

Next: End

STUCK IN DHW DEMAND

DHW FLOW SWITCH

Next: End

FIRING NO DEMAND

PCB

Next: End

FIRING NO DEMAND 2

PCB

Next: End

NO VOLTAGE TO DIVERTER

PCB

Next: End

MECHANICAL PHYSICAL OPERATION

FAN

Next: End

POWER DIVERTOR

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

NEW MODEL FLUEWAYS

HEAT EXCHANGER PRIMARY

Next: End

NO POWER TO DIVERTER CH

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

BLANK FOR INFORMATION PAGE

BOILER OVERHEAT

Next: End

NEW MODELBLOCKED OR DAMAGED

FLUE

Next: End

POOR SUPPLY

GAS PRESSURE INLET

Next: End

NEW MODELBLOCKED OR DAMAGED

BURNER

Next: End

GAP DAMAGE

ELECTRODES

Next: End

BLOCKED OR DAMAGED FAN RUNS SPARKING DOES NOT OCCUR

TUBE IMPULSE AIR PRESSURE

Next: End

BLOCKED OR DAMAGED

VENTURI

Next: End

FAN RUNS SPARKING DOES NOT OCCUR

FAN

Next: End

NO SPARK

PCB

Next: End

NO SPARK

ELECTRODE SPARK GAP

Next: End

PASSING POOR DHW

DIVERTER VALVE BODY

Next: End

BOILER TEMP LOW SYSTEM TEMP LOWOPERATION DHW DHW COOL RADS COOL

GAS PRESSURE INLET

Next: End

BLOWN STAND BY MODE AT POWER UP

MAIN FUSE FUSED SPUR F1

Next: End

FLOW RATE

FLOW RESTRICTOR

Next: End

FOR TYPE DIAG PROCEDURE

DIRECTION CHOICE OR CONTINUE

Next: End

BLOWN STANDBY MODE AT POWER UP

FUSE MAIN PCB

Next: End

BURNER PRESSUREOPERATION DHW DHW COOL RADS COOL

GAS VALVE ADJUSTMENT

Next: End

BLOWN STANDBY MODE

FUSE MAIN PCB F3

Next: End

BOILER KETTLING DHW OPERATION

BYPASS (INTEGRAL APPLIANCE)

Next: End

LED AT POWER UP

PCB

Next: End

BOILER KETTLING

PUMP

Next: End

SPARKING NO GAS

SAFETY OVERHEAT STAT

Next: End

SPARK NO GAS

THERMOSTAT - OVERHEAT - COMBUSTION CHAMBER

Next: End

POOR FLOW RATE

SERVICE VALVE INLET (WATER INLET)

Next: End

BURNER BAFFLES

TRAP - CONDENSATE

Next: End

FUN RUNS NO SPARK

TRAP - CONDENSATE

Next: End

COOL DHWDHW HOT THEN COLD

TRAP - CONDENSATE

Next: End

FLUE PROBEDHW HOT THEN COLD

FLUE

Next: End

UNDER PRESSURE

EXPANSION VESSEL

Next: End

CH OPERATION FAILURE TO REFIRE

Next: End

BOILR SHUTS DOWN PREMATURELY CHOPERATION

PUMP

Next: End

BOILER SHUTS DOWN PREMATURLEY BOILER NOISY

Next: End

CH OPERATION

SENSOR TEMP PRIMARY

Next: End

NO CH

PCB

Next: End

NO HEATING

PCB

Next: End

INTEGRAL TIMERNO HEATING

PCB

Next: End

DHW HOT THEN COLD

PUMP

Next: End

DHW NOISY

HEAT EXCHANGER CONDENSING

Next: End

CH NOISY

HEAT EXCHANGER CONDENSING

Next: End

NO CH

DIVERTER VALVE BODY

Next: End

CH DEMAND

DHW FLOW SWITCH

Next: End

NO CH DIVERTOR MOVEMENT

PCB

Next: End

CH ANTI-CYCLE

BYPASS (INTEGRAL APPLIANCE)

Next: End

BLOCKED OR DAMAGED

FLUE

Next: End

FURTHER INVESTIGATION

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

FURTHER INVESTION PUMP F2 F3

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

NO FAN

PRIMARY CIRCUIT PRESSURE SWITCH

Next: End

FAN DOES NOT RUN

FAN

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFF

HEAT EXCHANGER DHW

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFF

HEAT EXCHANGER PRIMARY

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFF

PCB

Next: End

FURTHER INVESTIGATIONF1

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

FURTHER INVEST F2&3

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

DHW HOT THEN COLD

FLUE NTC PROBE

Next: End

NO DHW DEMAND

PCB

Next: End

NO DHW PUMPNO DHW PUMP

HARNESS SENSOR TEMP PRIMARY

Next: End

NO PUMP DHWNO DHW PUMP

HARNESS SENSOR TEMP DHW

Next: End

FLUE SENSOR HARNESS NO PUMPNO DHW PUMP

HARNESS - FAN/APS/FLUE NTC

Next: End

SAFTEY THERMOSTATS NO PUMPNO DHW PUMP

HARNESS - FAN/APS/FLUE NTC

Next: End

NO PUMPNO DHW PUMP

PRIMARY CIRCUIT PRESSURE SWITCH

Next: End

DHW PUMPNO DHW PUMP

PCB

Next: End

NO PUMP[NO DHW PUMP

AIR PRESSURE SENSOR

Next: End

PUMP NOT RUNNING

PUMP CAPACITOR

Next: End

CH LOCKOUT

PCB

Next: End

CH LOCKOUT

HARNESS SENSOR TEMP PRIMARY

Next: End

NO PUMP DHWNO DHW PUMPDHW LOCKOUTDHW LOCKOUT

HARNESS SENSOR TEMP DHW

Next: End

DHW LOCKOUT

PCB

Next: End

POOR DHW OPERATIONDHW HOT THEN COLDFLUE SENSOR LOCKOUT

FLUE NTC PROBE

Next: End

FLUE SENSOR LOCKOUT

HARNESS - FAN/APS/FLUE NTC

Next: End

FLUE SENSOR LOCKOUT

PCB

Next: End

FAULTY FLUE NTC

PCB

Next: End

FAULTY FLUE NTC

HARNESS - FAN/APS/FLUE NTC

Next: End

PRIMARY CIRCUIT FAULTY

PCB

Next: End

LOCKOUT PRIMARY CIRCUIT FAULTY

HARNESS PRIMARY CIRCUIT SWITCH

Next: End

PUMP NOT RUNNINGPRIMARY CIRCUIT FAULTY2

PUMP CAPACITOR

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFFFAULTY PRIMARY CIRCUIT

PCB

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFFFAULTY PRIMARY CIRCUIT

HEAT EXCHANGER DHW

Next: End

DHW HOT THEN COLDHOT THEN COLD DHWDIFFFAULTY PRIMARY CIRCUIT

HEAT EXCHANGER PRIMARY

Next: End

AIR PRESSURE LOCKOUT

PCB

Next: End

AIR PRESSURE FAULT

AIR PRESSURE SENSOR

Next: End

FAN RUNS

Z DIRECTION CHOICE OR CONTINUE

Next: End

OVERHEAT

BOILER OVERHEAT

Next: End

OVERHEATOVERHEAT

HARNESS SAFETY STATS

Next: End

NO POWER UP NO DHW DEMAND

PCB

Next: End

LEAD NO SPARK

ELECTRODES

Next: End

FLAME SENSE

PCB

Next: End

FLAME SENSE BURNER IGNITES DOES NOT ESTABLISH

PCB

Next: End

HIGH_LOW ADJUSTMENT

BURNER PRESSURE ADJUSTMENT

Next: End

IGNITION ADJUSTMENT

BURNER PRESSURE ADJUSTMENT

Next: End

LOW SYSTEM TEMP POT

PCB

Next: End

OVERHEATOVERHEAT

BOILER OVERHEAT

Next: End

UNABLE TO RESET OVERHEAT

PCB

Next: End

SAFTEY STATS OVERHEAT

HARNESS - FAN/APS/FLUE NTC

Next: End

MAIN SOLENIOD

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

FUTHER INVEST F1

HARNESS-PUMP/ DIVERTER/GAS VALVE

Next: End

NO VOLTAGE

CABLE - FAN

Next: End

OVERHEAT

TEMPERATURE OVERHEAT

Next: End

BLOCKAGE

EXPANSION VESSEL PIPE

Next: End

MAINS FUSE

FUSE GONE PCB

Next: End

F1 OR F2

FUSE GONE PCB

Next: End

FUSE F2 F3

CABLE - FAN

Next: End

F1

CABLE - FAN

Next: End

F1

HARNESS MODULATOR

Next: End

F2

HARNESS MODULATOR

Next: End

NO RESET OVERHEAT

PCB

Next: End

OVERHEAT

HARNESS SAFETY STATS

Next: End

SPARKING OCCURS BURNER DOES NOT LIGHT

GAS VALVE

Next: End

OVERHEAT

PCB

Next: End

DHW FAN RUNS

HARNESS - FAN/APS/FLUE NTC

Next: End

DHW FAN RUNS

AIR PRESSURE SENSOR

Next: End

AIR PRESSURE SENSOR

AIR PRESSURE SENSOR

Next: End

DHW TOO HOT

GAS PRESSURE ADJUSTMENT

Next: End

TEMPERATURE CONTROL DHW

PCB

Next: End

AIR INTAKE CONTAMINATION

FLUE

Next: End

POOR DHW OPERATION

FLUE NTC PROBE

Next: End

POOR DHW OPERATION

PCB

Next: End

NO CH BOILER UP TO TEMP

DIVERTER VALVE BODY

Next: End

BOILER FIRES NO DEMAND

FROST PROTECTION

Next: End

CH NO DEMAND

Next: End

FIRING NNO DEMAND

INTEGRAL TIMER

Next: End

VOLTAGE NO MOVEMENT DHW

DIVERTER VALVE HEAD

Next: End

VOLTAGE NO MOVEMENT CH

DIVERTER VALVE HEAD

Next: End

FLAME LIFT OFF

FLUE SEALS

Next: End

BOCKED OR DAMAGED SPARKING OCCURS BURNER DOESNOT IGNITE

BURNER INJECTORS

Next: End

DHW NOISY KETTLING

HEAT EXCHANGER DHW

Next: End

SUPPLY FAULT AT POWER UP

Next: End

PASSING

DIVERTER VALVE BODY

Next: End

FURTHER INVESTIGATION F1

Z DIRECTION CHOICE OR CONTINUE

Next: End

FLOW RATE

HEAT EXCHANGER DHW

Next: End

FURTHER IN VESTIGATION F2

Z DIRECTION CHOICE OR CONTINUE

Next: End

LOW GAS RATE CH OPERATIONOPERATION DHW DHW COOL RADS COOL

BURNER INJECTORS

Next: End

FURTHER IN VESTIGATION F3

DIRECTION CHOICE OR CONTINUE

Next: End

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

Z REDIRECTS BY HTML LINK

Next: End

NO POWER TO GAS VALVENO FAN

PCB

Next: End

SAFETY THERMOSTATS

HARNESS - FAN/APS/FLUE NTC

Next: End

POOR DHW OPERATIONDHW HOT THEN COLD

FLUE NTC PROBE

Next: End

POTENTIOMETER TEMP CONTROL CH OP BOILER NOISY 2

PCB

Next: End

CH OPERATION NOISEY

Next: End

NO POWER UP

PCB

Next: End

NO CH DEMAND

Next: End

NO CH

INTEGRAL TIMER

Next: End

NO CH DEMAND/ROOM STAT

Next: End

INTEGRAL TIMERNO CH

INTEGRAL TIMER

Next: End

DHW NOISY KETTLING

HEAT EXCHANGER PRIMARY

Next: End

NO FAN

HARNESS SENSOR TEMP PRIMARY

Next: End

NO FAN

HARNESS SENSOR TEMP DHW

Next: End

CH OPERATION NOISY

HEAT EXCHANGER PRIMARY

Next: End

ANTI CYCLE

PCB

Next: End

FLUE PROBE NTC WITHIN RESISTANCES BUT HOTTER THAN EXPECTED

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN AND TEMPERATURE

Next: p1488

FLUE PROBE NTC AND HARNESS OUT OF RESISTANCE READINGS

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN AND TEMPERATURE

Next: p1501

FAULTY PRIMARY CIRCUIT NO WATER

CHARACTERISTIC TEST FROM PRIMARY FLOW FAULTY

Next: p1523

FAULTY PRIMARY CIRCUIT ABSENCE OF FLOW

CHARACTERISTIC TEST FROM PRIMARY FLOW FAULTY

Next: p1520

FAN RUNS SPARKING DOES NOT OCCUR

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p197

FAN RUNS SPARKING OCCURS BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p199

BURNER IGNITES BUT DOES NOT ESTABLISH

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p1715

BURNER IGNITES BUT BAFFLES OUT OR LIFTS OFF

CHARACTERISTIC TEST FROM FAN RUNS BURNER IGNITES AND ESTABLISHES DHW DEMAND

Next: p203

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p2037

DHW COOL RADS COLD NO HEAT DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p290

DHW COOL RADS HOT WITH NO CH DEMAND

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p292

DHW NOISY KETTLING

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p294

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p1771

BOILER KETTLES

CHARACTERISTIC TEST FROM CH OPERATION (FOR HEAT EX DIAG)

Next: p470

FLUE PROBE NTC WITHIN TABLE RANGE BUT TEMP HOTTER THAN 60-70 DEGREES

CHARACTERISTIC TEST FROM RESISTANCE FLUE SENSOR

Next: p564

FLUE PROBE NTC OUT OF RESISTANCE READINGS

CHARACTERISTIC TEST FROM RESISTANCE FLUE SENSOR

Next: !p1287

BOILER NOISY

CHARACTERISTIC TEST FROM OPERATION CH

Next: p598

BOILER UP TO TEMP RADS COLD

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1650

BOILER TEMP LOW SYSTEM TEMP LOW

CHARACTERISTIC TEST FROM OPERATION CH

Next: p1803

OPERATION SATISFACTORY BUT BOILER GOES TO OVER HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p604

OPERATION SATISFACTORY BOILER AND SYSTEM REACHES TEMP BUT GETS TOO COOL BEFORE REFIRING

CHARACTERISTIC TEST FROM OPERATION CH

Next: p606

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p608

TEMP DIFF INCORRECT LOCAL BOILING

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN AND TEMPERATURE

Next: p732

DIFFERENTIAL OK

CHARACTERISTIC TEST FROM TEMPERATURE DIFFERENTIAL FLOW RETURN AND TEMPERATURE

Next: !p656

FUSE 1 (3AMP FUSED SPUR)

CHARACTERISTIC TEST FROM FURTHER INVESTIGATION FUSE

Next: p1067

FURTHER INVESTIGATION F1 OR F2 ON PCB

CHARACTERISTIC TEST FROM FURTHER INVESTIGATION FUSE

Next: p1084

26/01/2018 11:32:35 1801_1_50_1 31/01/2018 10:08:08

29/01/2018 08:45:44

Next: End

NO CH MOVEMENT

DIVERTER VALVE HEAD

Next: End

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE PLUG FROM THE GAS VALVE SOLENOID

Next: !p1905, !f1071

RESISTANCE GAS VALVE SOLENOID MODULATING

REMOVE THE LEADS FROM THE MODULATOR

Next: !p1942, !f1075

PUMP RESISTANCES

Next: !p1108, !f1079

RESISTANCE FAN

Next: !p1941, !f1083

RESISTANCE GAS VALVE SOLENOID MAIN

REMOVE THE PLUG FROM THE GAS VALVE SOLENOID

Next: !p1903, !f1088

RESISTANCE GAS VALVE SOLENOID MODULATING

REMOVE THE LEADS FROM THE MODULATOR

Next: !p1943, !f1092

PUMP RESISTANCES

Next: !p1109, !f1096

RESISTANCE FAN

Next: !p1940, !f1100

VOLTAGE FAN (AT FAN)

Next: !p114, f115

VOLTAGE FAN (AT PCB)

{GAINPCBACS}

Next: !p1907, f117

DIFFERENTIAL ON CH

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p1165, f1166

INSPECTION CONDENSING HEAT EXCHANGER

TURN OFF FLOW AND RE

Next: !p1167, !f1168

RESISTANCE PRIMARY CIRCUIT SWITCH

DISCONNECT THE BLACK LEADS FROM THE PRIMARY CIRCUIT SWITCH

Next: p174, f119

SYSTEM PRESSURE OK

Next: !p1112, !f173

RESISTANCE OF DIVERTER MOTOR

REMOVE PLUG FROM DIVERTER HEAD

Next: !p1206, !f1207

RESISTANCE OF DIVERTER MOTOR

REMOVE PLUG FROM DIVERTER HEAD

Next: !p1215, !f1216

DHW FLOW SWITCH

DISCONNECT THE X2 CONNECTOR FROM THE PCB

Next: !p137, !f136

RESISTANCE PRIMARY SENSOR AND HARNESS

DISCONNECT X2 PLUG ON THE PCB

Next: p1379, f1380

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: !p1381, !f1382

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: !p1385, !f1386

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: !p1389, !f1390

RESISTANCE COMBUSTION CHAMBER OVERHEAT

DISCONNECT ONE OF THE BLACK LEADS FROM THE COMBUSTION CHAMBER OVERHEAT THERMOSTAT

Next: p1393, !f1394

SYSTEM PRESSURE ABOVE 1BAR

Next: !p1399, !f1400

RESISTANCE AIR PRESSURE SENSOR HARNESS

REMOVE PLUG FROM AIR PRESSURE SENSOR AND REMOVE PLUG FROM PCB ON RIGHT HAND SIDE MARKED X15

Next: !p1403, !f1404

RESISTANCE PRIMARY SENSOR AND HARNESS

DISCONNECT X2 PLUG ON THE PCB

Next: !p1470, f1471

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: !p1472, !f1473

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X2 ON THE PCB

Next: !p1483, f1480

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: !p1481, !f1482

RESISTANCE FLUE NTC AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: !p1504, ?1487, ?1489

RESISTANCE FLUE NTC AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: !p1507, f1508

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: !p1509, !f1510

RESISTANCE PRIMARY CIRCUIT SWITCH

DISCONNECT THE BLACK LEADS FROM THE PRIMARY CIRCUIT SWITCH

Next: !p1528, !f1529

VOLTAGE AT PCB TO PUMP

DHW DEMAND

Next: p1532, !f1598

VOLTAGE AT PCB TO PUMP

DHW DEMAND

Next: p1348, f1378

DIFFERENTIAL ON CH

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p1594, f1595

INSPECTION CONDENSING HEAT EXCHANGER

TURN OFF FLOW AND RE

Next: !p1596, !f1597

CAN BOILER BE RESET?

RESET BOILER BY PUTTING SELECTOR SWITCH TO STANDBY THEN TURN BACK ON

Next: p1601, f1602

RESISTANCE AIR PRESSURE SENSOR AND HARNESS

UNPLUG CONNECTOR X15 FROM PCB

Next: !p1603, f1604

RESISTANCE AIR PRESSURE HARNESS

REMOVE PLUG FROM AIR PRESSURE SENSOR AND REMOVE PLUG FROM PCB ON RIGHT HAND SIDE MARKED X15

Next: !p1605, !f1606

RESISTANCE SAFETY STATS AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: !p1946, f1945

RESISTANCE SAFETY STATS AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: !p1815, f1629

RESISTANCE SAFETY THERMOSTAT

Next: p1630, !f1631

FAN RUNS CH DEMAND

Next: p1644, f37

RESISTANCE ELECTRODE SENSE

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: p1749, !f1750

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: !p1798, !f1761

CAN HIGH LOW BURNER PRESSURE BE ADJUSTED

DHW TEMPERATURE CONT

Next: !p1796, !f1797

CAN BOILER BE RESET

Next: !p1814, f1627

RESISTANCE SAFETY STATS_HARNESS AT TEMP

Next: p1952, f1879

RESISTANCE COMBUSTION CHAMBER OVERHEAT

DISCONNECT ONE OF THE BLACK LEADS FROM THE COMBUSTION CHAMBER OVERHEAT THERMOSTAT

Next: p1880, !f1881

DOES BOILER FUNCTION WITHOUT OVERHEATING

DHW TEMPERATURE CONT

Next: !p1927, f1816

RESISTANCE SAFETY OVERHEAT STAT

Next: p1949, !f1948

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: !p2012, !f2013

RESISTANCE AIR PRESSURE SENSOR HARNESS

REMOVE PLUG FROM AIR PRESSURE SENSOR AND REMOVE PLUG FROM PCB ON RIGHT HAND SIDE MARKED X15

Next: p2023, !f2024

CAN HIGH LOW BURNER PRESSURE BE ADJUSTED

DHW TEMPERATURE CONT

Next: !p2035, !f2036

INSPECTION FLUE SEALS

Next: p206, !f207

INSPECT CONDENSATE SYPHON DRAIN FOR BLOCKAGE BACK-UP

Next: p2081, !f2082

IS BOILER IN FROST PROTECTION

Next: !p2094, f2095

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p2096, !f2097

VOLTAGE EXTERNAL CONTROLS NO DEMAND

NO DEMAND FROM EXTERNAL CONTROLS

Next: !p2102, !f2103

VOLTAGE DIVERTER VALVE PCB

{GAINPCBACS}
BOILER MAINS SWITCH ON

Next: p2127, !f2109

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p230, !f231

INSPECTION TUBES AIR PRESSURE

Next: p242, !f243

VOLTAGE MAINS POWER INPUT TO APPLIANCE

REMOVE CONTROL BOX COVER

Next: p30, f31

RESISTANCE FUSE F1 (FUSED SPUR)

REMOVE FUSE FROM FUSED SPUR

Next: !p32, f33

FUSE FURTHER INVESTIGATION F1

Next: !p34, !f35

RESISTANCE FUSE F2 ( APPLIANCE)

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: p38, f39

FUSE FURTHER INVESTIGATION F2

Next: !p40, !f41

BURNER PRESSURE

THERMOSTAT TURNED TO MAX
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: !p419, !f420

AIR PRESSURE SWITCH PROVING AT APS AIR FLOW TEST

SET PERFORMANCE TEST

Next: p1052, f241

FUSE FURTHER INVESTIGATION F3

Next: !p44, !f45

RESISTANCE SAFETY THERMOSTAT

Next: p505, !f506

INSPECTION SERVICE VALVE DHW

Next: p384, !f53

DOES BOILER RUN OFF INTEGRAL TIMER

Next: p665, f661

LINK OUT EXTERNAL CONTROLS

REMOVE WIRES FROM EXTERNAL CONTROLS AND REPLACE WITH A LINK

Next: !p670, !f671

REMOVE INTEGRAL TIMER

REMOVE X11 INTEGRAL TIMER PLUG FROM PCB AND MAKE SAFE

Next: !p672, !f673

REMOVE INTEGRAL TIMER

REMOVE X11 INTEGRAL TIMER PLUG FROM PCB AND MAKE SAFE

Next: !p678, !f679

IS DHW FLOW SWITCH STUCK IN HW MODE

{GAINPCBACS}
DHW TAP OFF
DISCONNECT THE X2 CONNECTOR FROM THE PCB

Next: p683, !f749

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: !p727, !f1061

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: !p730, !f1062

AIR PRESSURE SENSOR HARNESS CONTINUITY

{GAINPCBACS}
REMO

Next: p2027, !f1054

INSPECTION PRIMARY HEAT EXCHANGER

Next: p1057, !f1934

INSPECTION CONDENSING HEAT EXCHANGER FLUEWAYS

TURN OFF FLOW AND RE

Next: !p1059, !f1060

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT PLUG MARK

Next: p1068, f1069

RESISTANCE GAS VALVE SOLENOID MODULATING AND HARNESS

REMOVE THE PLUG X2 FROM PCB

Next: p1072, f1073

RESISTANCE PUMP AND HARNESS

DISCONNECT PLUG MARKED X6A FROM PCB

Next: p1199, f1077

RESISTANCE FAN AND HARNESS

DISCONNECT PLUG MARKED X7 FROM THE PCB

Next: !p1938, f1081

RESISTANCE GAS VALVE SOLENOID MAIN AND HARNESS

DISCONNECT PLUG MARK

Next: p1085, f1086

RESISTANCE GAS VALVE SOLENOID MODULATING AND HARNESS

REMOVE THE PLUG X2 FROM PCB

Next: p1089, f1090

RESISTANCE PUMP AND HARNESS

DISCONNECT PLUG MARKED X6A FROM PCB

Next: p1208, f1094

RESISTANCE FAN AND HARNESS

DISCONNECT PLUG MARKED X7 FROM THE PCB

Next: !p1939, f1098

TEMPERATURE DIFFERENTIAL HEAT EXCHANGER DHW1

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p1169, f1164

RESISTANCE DIVERTER AND HARNESS

REMOVE DIVERTER HEAD FROM BODY, KEEP HARNESS PLUGGED INTO DIVERTER HEAD
REMOVE PLUG X6A FROM PCB

Next: p1076, f1205

RESISTANCE DIVERTER AND HARNESS

REMOVE DIVERTER HEAD FROM BODY, KEEP HARNESS PLUGGED INTO DIVERTER HEAD
REMOVE PLUG X6A FROM PCB

Next: p1093, f1214

RESISTANCE OF PUMP HARNESS

REMOVE CONNECTOR X6A FROM PCB
REMOVE CAPACITOR/PLUG FROM PUMP

Next: p1406, !f1350

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X2 ON THE PCB

Next: p1383, f1384

RESISTANCE FLUE NTC AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: p1387, f1388

RESISTANCE SAFETY STATS AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: p1391, f1392

RESISTANCE PRIMARY CIRCUIT SWITCH

DISCONNECT THE BLACK LEADS FROM THE PRIMARY CIRCUIT SWITCH

Next: p1397, f1398

RESISTANCE SAFETY THERMOSTAT

Next: !p1395, !f1396

RESISTANCE AIR PRESSURE SENSOR AND HARNESS

UNPLUG CONNECTOR X15 FROM PCB

Next: !p1401, f1402

IS PUMP RUNNING FREELY

Next: p1407, !f1408

PUMP RESISTANCES

Next: !p1409, !f1410

INSPECT CONDENSATE SYPHON DRAIN FOR BLOCKAGE BACK-UP

Next: p1491, !f1492

INSPECTION FLUE

Next: !p1493, !f1494

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: !p1502, !f1503

RESISTANCE PRIMARY CIRCUIT SWITCH AND HARNESS

REMOVE X2 CONNECTOR ON PCB

Next: !p1521, f1522

IS PUMP RUNNING

Next: p1567, f1531

SYSTEM PRESSURE ABOVE 1BAR

Next: p1518, !f1527

RESISTANCE OF PUMP HARNESS

REMOVE CONNECTOR X6A FROM PCB
REMOVE CAPACITOR/PLUG FROM PUMP

Next: p1560, !f1561

IS PUMP RUNNING FREELY

Next: p1562, !f1563

PUMP RESISTANCES

Next: !p1564, !f1565

PUMP LIMPET

Next: p1568, !f1569

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: p1570, !f1571

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p1591, !f1573

TEMPERATURE DIFFERENTIAL HEAT EXCHANGER DHW1

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p1592, f1593

DOES FAN RUN

RESET BOILER BY TURNING ON/OFF DIAL TO OFF, LEAVE FOR A SECOND THEN TURN BACK ON
DHW TAP ON

Next: !p1607N, !f1608

RESISTANCE COMBUSTION CHAMBER OVERHEAT

DISCONNECT ONE OF THE BLACK LEADS FROM THE COMBUSTION CHAMBER OVERHEAT THERMOSTAT

Next: !p1632, !f1633

DHW FLOW SWITCH

DISCONNECT THE X2 CONNECTOR FROM THE PCB

Next: !p1645, !f1646

INSPECTION INTEGRAL BYPASS

WATER OFF
FLOW AN

Next: p2089, !f1649

FLOW AND RETURN VALVES FULLY OPEN

Next: p680, !f1664

RESISTANCE IGNITION LEADS

REMOVE BOTH IGNITION LEADS FROM CONNECTOR AND PCB

Next: !p1684, !f1685

PRESSURE GAS BURNER IGNITION

THERMOSTAT TURNED TO MAX
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: p1746, f1759

RESISTANCE PRIMARY SENSOR AND HARNESS

DISCONNECT X2 PLUG ON THE PCB

Next: p175, f726

VOLTAGE RECTIFICATION

GAIN ACCESS TO INNER COMBUSTION CHAMBER
SELECTOR SWITCH TO STANDBY
NO DEMAND

Next: p1747, f1748

INSPECTION ELECTRODE SENSE POSITION

Next: p1753, !f1754

RESISTANCE ELECTRODE SENSE HARNESS

REMOVE FLAME DETECTION ELECTRODE FROM ITS HOUSING

Next: !p1751, !f1752

RESISTANCE SENSOR TEMP DHW AND HARNESS

DISCONNECT CONNECTOR FROM X2 ON THE PCB

Next: p2003, f729

INSPECTION BURNER

REMOVE THE COMBUSTION COVER CASE AND INNER COVER

Next: p1755, !f1756

INSPECTION FLUE

Next: !p1757, !f1758

IS BURNER PRESSURE MODULATING

THERMOSTAT TURNED TO MAX
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: p2049, f2034

IS HIGH LOW BURNER PRESSURE CORRECT

DHW TEMPERATURE CONT

Next: p691, f1795

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: !p1804, !f1805

PUMP IMPELLOR OK?

REMOVE SCREW FROM MIDDLE OF PUMP (USE TRAY TO CATCH ANY WATER)

Next: p1849, !f1850

PUMP LIMPET TEST

Next: p1851, !f1852

EXTERNAL BYPASS SYSTEM

Next: p1853, !f1854

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p1855, !f1856

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: p1908, !f1858

RESISTANCE SAFETY THERMOSTAT

Next: !p1900, !f1883

INSPECT CONDENSATE SYPHON DRAIN FOR BLOCKAGE BACK-UP

Next: p1979, !f1978

RESISTANCE COMBUSTION CHAMBER OVERHEAT

DISCONNECT ONE OF THE BLACK LEADS FROM THE COMBUSTION CHAMBER OVERHEAT THERMOSTAT

Next: !p1950, !f1951

INSPECTION GAS VALVE SHUT DOWN

Next: p1848, !f1972

AIR PRESSURE SWITCH PROVING AT PCB

GAIN ACCESS TO PCB
AIR PRESSURE SENSOR PLUG LOCATED ON RIGHT HAND SIDE OF PCB

Next: p275, f422

RESISTANCE GAS VALVE HARNESS

REMOVE HARNESS FROM GAS VALVE
REMOVE CONNECTOR X6A FROM PCB

Next: !p1974, !f1975

INSPECTION BURNER

REMOVE THE COMBUSTION COVER CASE AND INNER COVER

Next: p1980, !f1981

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE COMBUSTION COVER CASE AND INNER COVER

Next: p1982, !f1983

INSPECTION FLUE

Next: !p1984, !f1985

PUMP LIMPET

Next: p2076, !f2002

PRESSURE GAS BURNER IGNITION

THERMOSTAT TURNED TO MAX
CONNECT A U-GAUGE TO THE BURNER GAS PRESSURE TEST POINT

Next: p228, f229

RESISTANCE FLUE NTC AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: p2014, f2011

RESISTANCE AIR PRESSURE SENSOR AND HARNESS

UNPLUG CONNECTOR X15 FROM PCB

Next: p502, f2022

INSPECTION TUBES AIR PRESSURE

Next: !p2025, !f2026

VOLTAGE PERMANENT FROM PCB APS

TURN ON BOILER AND ALLOW FAN TO RUN

Next: !p2028, !f2029

DID BURNER BAFFLE OR ROLL DOWN OR LIFT OFF

Next: p204, f205

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: p1762, !f2047

INSPECTION FAN MECHANICAL

REMOVE FAN

Next: p545, !f211

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: !p2050, !f2051

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: p337, !f2074

INSPECTION COMBUSTION CHAMBER

REMOVE FRONT COMBUSTION CASE
REMOVE INNER COVER

Next: !p208, !f209

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p2077, !f2078

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: p2079, f2080

INSPECTION INTEGRAL BYPASS

WATER OFF
FLOW AN

Next: p2085, !f2086

INSPECTION FLUE

Next: !p2083, !f2084

TEMP DIFFERENCE ON DHW HEAT EXCHANGER CORRECT

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p2087, !f2088

INSPECTION EXTERNAL BYPASS

Next: !p2090, !f2091

IS DHW FLOW SWITCH STUCK IN HW MODE

{GAINPCBACS}
DHW TAP OFF
DISCONNECT THE X2 CONNECTOR FROM THE PCB

Next: p2098, !f2099

DOES BOILER RUN OFF INTEGRAL TIMER

Next: p2100, f2101

INSPECTION HEAT EXCHANGER PRIMARY (FLUE WAYS)

REMOVE COMBUSTION COVER CASE AND INNER COVER

Next: p212, !f213

VOLTAGE INTEGRAL TIMER

INTEGRAL TIMER IN OFF POSITION

Next: !p2104, !f2105

INSPECTION FLUE

Next: !p214, !f215

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR X6A FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p2128, !f2129

RESISTANCE HARNESS DIVERTER VALVE

REMOVE CONNECTOR X6A FROM THE PCB
REMOVE THE CONNECTOR FROM THE DIVERTER VALVE MOTOR

Next: !p2131, !f2132

INSPECTION BURNER

REMOVE THE COMBUSTION COVER CASE AND INNER COVER

Next: p236, !f237

VOLTAGE GAS VALVE (AT PCB)

{GAINPCBACS}
FUNCTION SELECTOR TO DHW POSITION

Next: p1973, !f1976

INSPECTION ELECTRODE AND GAP

Next: !p238, !f239

INSPECTION VENTURI

REMOVE SILICONE RUBBER TUBES FROM THE VENTURI

Next: p244, !f245

INSPECTION FAN

REMOVE FAN

Next: p552, !f247

SPARKING OCCUR AT PCB

GAIN ACCESS TO PCB

Next: p282, !f277

SPARK GAP AND CONDITION

Next: p1683, !f285

PRESSURE GAS INLET

ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p2052, !f338

INSPECTION DIVERTER VALVE DHW POSITION

REMOVE DIVERTER VALVE MOTOR
DO NOT HOLD THE ACTUATOR FOR THIS TEST

Next: p327, f2107

INSPECTION CONDENSATE TRAP

Next: p475, !f1064

FAN RUNS DHW DEMAND

Next: p36, f1634

CH OPERATION (FOR HEAT EX DIAG)

FLOW AND RETURN VALVES FULLY OPEN
CH THERMOSTAT SET TO MAX

Next: !p311, ?315

INSPECTION DIVERTER VALVE SPINDLE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p333, !f334

DIFFERENTIAL TEMP HEAT EXCHANGER DHW

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p335, !f1063

GAS RATE

Next: p1986, f418

FURTHER INVESTIGATION LED PROBLEM

Next: !p48, !f49

RESISTANCE FUSE F3 ( APPLIANCE)

REMOVE FUSE FROM FUSE AND HOLDER FROM PCB

Next: !p664, f43

DHW FLOW RATE RESTRICTOR

TURN OFF COLD WATER INLET TO BOILER
DRAIN WATER AS APPROPRIATE

Next: !p385, !f386

INSPECTION BYPASS (INTEGRAL APPLIANCE)

WATER OFF
FLOW AN

Next: p723, !f472

PUMP LIMPET

Next: p309, !f492

RESISTANCE SAFETY STATS AND HARNESS

DISCONNECT CONNECTOR FROM X4 ON THE PCB

Next: !p503, f504

RESISTANCE COMBUSTION CHAMBER OVERHEAT

DISCONNECT ONE OF THE BLACK LEADS FROM THE COMBUSTION CHAMBER OVERHEAT THERMOSTAT

Next: !p507, !f508

RESISTANCE DHW SENSOR

REMOVE RED WIRED LEAD FROM DHW SENSOR

Next: p510, !f1285

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p560, !f1286

INSPECTION CONDENSATE SYPHON AND DRAIN

Next: p210, !f551

INSPECTION CONDENSATE SYPHON DRAIN

Next: p1056, !f558

RESISTANCE FLUE PROBE NTC

DISCONNECT PLUG FROM FLUE SENSOR

Next: p1147, ?563, ?565

INSPECT CONDENSATE SYPHON DRAIN FOR BLOCKAGE BACK-UP

Next: p567, !f568

INSPECTION FLUE

Next: !p569, !f570

PUMP LIMPET TEST

Next: p643, !f644

CAN BOILER BE RESET

Next: !p1618, f1619

VOLTAGE BOILER SWITCHED LIVE ROOM STAT STILL CALLING

THERMOSTAT TO ON POSITION

Next: p764, !f612

EXPANSION VESSEL PRESSURE

BOILER DISCHARGED

Next: !p1937, !f610

INSPECTION BYPASS SYSTEM

Next: p645, !f646

RESISTANCE PRIMARY SENSOR

REMOVE BLUE LEAD FROM CH SENSOR

Next: p647, !f657

CH BURNER MODULATION

CH TEMPERATURE CONTROL TO MID SETTING
ATTACH A U GAUGE TO BURNER PRESSURE TEST POINT

Next: p649, !f1802

TEMPERATURE DIFFERENTIAL FLOW RETURN AND TEMPERATURE

ON/OFF SWITCH ON
ATTACH TEMPERATURE CLAMPS AS INDICATED BY THE RED ARROWS

Next: !p651, ?653, ?655

IS THERE A ROOM STAT CONNECTED

Next: p674, f669

EXTERNAL CONTROLS

REMOVE EXTERNAL CONTROLS FROM VOLT FREE CONNECTOR BLOCK, REPLACE WITH A LINK

Next: !p675, f677

DIVERTER VALVE ACTUATOR OPERATION CH MODE

REMOVE DIVERTER VALVE MOTOR
DO NOT HOLD THE ACTUATOR FOR THIS TEST

Next: p736, f682

POWER TO DIVERTER VALVE AT PCB CH

BOILER MAINS SWITCH ON

Next: p2130, !f752

PUMP LIMPET

Next: p509, !f713

INSPECTION CONDENSING HEAT EXCHANGER

TURN OFF FLOW AND RE

Next: !p724, !f725

INSPECTION CONDENSING HEAT EXCHANGER

TURN OFF FLOW AND RE

Next: !p733, !f735

DIVERTER VALVE SPINDLE FREE

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p1647, !f742

INSPECTION INTEGRAL BYPASS

WATER OFF
FLOW AN

Next: !p765, !f766

System Information

  • Total Tests: 533
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control

XSol Diagnostic System - Generated from extracted test data