XSol Diagnostic System

F6 FAULT CODE

OUT OF MODEL

Next: &nff, f1358

F10 FAULT CODE

Next: &nff, f1364

F7 FAULT CODE

OUT OF MODEL

Next: &nff, f1370

F8 / F12 FAULT CODE

HEADER FOR F8 / F12 FAULT CODE - OUTSIDE MODEL

Next: &nff, f1378

F11 / F13 FAULT CODE

HEADER FOR F11 / F13 FAULT CODE - OUTSIDE MODEL

Next: &nff, f3763

F16 FAULT CODE

OUT OF MODEL

Next: &nff, f1389

OVERHEAT INVESTIGATION

Next: &nff, f1461

INFORMATION DIP SWITCHES

THERE ARE A BANK OF

Next: &nff, !f1689

F2 F3 FAULT CODE

OUT OF MODEL

Next: &nff, f2077

SEQUENCE OF OPERATION

NO LONGER IN MODEL

Next: &1355, !f1763

F19 FAULT CODE

OUT OF MODEL

Next: &nff, f1788

INFORMATION UNIVERSAL DISPLAY BOARD

Next: &nff, f1919

OBSERVATION DHW DEMAND

SET DHW TEMPERATURE SELECTOR TO MAX WITHOUT PREHEAT

Next: &759, f2038

UNIVERSAL DISPLAY SET UP

Next: &nff, !f2359

MAXIMUM FAN SPEED SET UP

Next: &nff, !f2361

F14 FLOW ABOVE 95 DEG

OUT OF MODEL

Next: &nff, f3479

FUSE INVESTIGATION SYMS

OUTSIDE MODEL

Next: &nff, f2677

F17 FAULT CODE

OUT OF MODEL

Next: &nff, f2830

CH SHUT DOWN

TURN DHW CONTROL OFF

Next: &nff, f2963

COMBUSTION ANALYSIS MAX AND MIN

{ISOLATEMAINSPOWER}<

Next: &816, f3900

FUSE INVESTIGATION IRIS

OUTSIDE MODEL

Next: &nff, f3048

F9 FLASHING FAULT

INTENTIONALLY BLANK

Next: &nff, f3348

F22/25 FAULT CODE

NOT USED

Next: &nff, f3658

INSPECTION FLUE COLLECTOR AND SEALS

{ISOLATEMAINSPOWER}

Next: &112, !f4021

ELECTRICAL SAFETY CHECKS

Next: End

SYSTEM CHECKS

Next: End

FAN RUNS

FAN LOOM

Next: End

FAULTY 1

MOD CARD

Next: End

FAN RUNS9999

FAN LOOM

Next: End

CALIBRATION 19999

THERMISTOR - HEATING FLOW RETURN

Next: End

CALIBRATION 19999

THERMISTOR - HEATING FLOW RETURN

Next: End

FAULT 39999

CARD - INTERFACE

Next: End

FAULT CODES

SYSTEM CHECKS

Next: End

FAULT F6

THERMISTOR - HEATING FLOW RETURN

Next: End

F10

THERMISTOR - HEATING FLOW RETURN

Next: End

F7

THERMISTOR DHW

Next: End

FAULT CODE 11

HARNESS - INTERFACE

Next: End

FAULT F16

GAS VALVE

Next: End

F5 FAULT

MAIN PCB

Next: End

F5 FAULT CODE

PUMP

Next: End

REDIRECT

SYSTEM CHECKS

Next: End

DIRECTION

SYSTEM CHECKS

Next: End

F19FAULT F6

THERMISTOR - HEATING FLOW RETURN

Next: End

F10F19

THERMISTOR - HEATING FLOW RETURN

Next: End

POOR 2WATER COOL RADS COOL

GAS SUPPLY

Next: End

DHW RUNS HOT THEN COLD

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW RUNS HOT THEN COLD

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW RUNS HOT THEN COLD

THERMISTOR DHW

Next: End

DHW RUNS HOT THEN COLD

PUMP

Next: End

DHW RUNS HOT THEN COLD

HEAT EXCHANGER - PLATE TO PLATE

Next: End

DHW RUNS HOT THEN COLD

CARD - INTERFACE

Next: End

NO FAN UNIVERSAL DISPLAY

CARD - INTERFACE

Next: End

PREHEAT NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

DHW TOO HOT NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

DHW RUNS HOT COLD NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

NO POWER TO DHW FLOW SWITCH

MAIN PCB

Next: End

FLOW SWITCH SECTION

HARNESS CONTROL

Next: End

DHW CALIBRATION 2

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW CALIBRATION 2

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW DEMAND OC

THERMOSTAT - OVERHEAT

Next: End

DHW CALIBRATION 2

THERMISTOR DHW

Next: End

NO DHW DEMAND NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

DHW DEMAND

CARD - INTERFACE

Next: End

HALL SENSOR

FAN ASSEMBLY

Next: End

F2 F3

FAN LOOM

Next: End

DISPLAY PCB VOLTAGE

MAIN PCB

Next: End

FAULTY 2

Next: End

FAULTY 2

Next: End

NO CH NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

NO CH

CARD - INTERFACE

Next: End

F1 LOCKOUT

WIRING HARNESSES

Next: End

NO DISPLAY

HARNESS - INTERFACE

Next: End

USER BOARD CONTROL INFO 2

SYSTEM CHECKS

Next: End

FAN SPEED CONTROL

FAN ASSEMBLY

Next: End

PREHEAT FAN FUNCTION

MAIN PCB

Next: End

BLANK FOR UNIVERSAL DISPLAY SET UP

Z BLANK

Next: End

BLANK FOR MAXIMUM FAN SPEED SET UP

Z BLANK

Next: End

FATIGUE IRIS

FUSE (FUSED SPUR)

Next: End

FATIGUE SYSMI

FUSE (FUSED SPUR)

Next: End

BLOWN9999FUSE IRIS

FUSE F1

Next: End

BLOWN

FUSE F1

Next: End

BLOWING FUSES

PUMP

Next: End

BLOWN

FUSE DC BOARD

Next: End

POOR NOT ESTABLISH

GAS SUPPLY

Next: End

ALWAYS ON

Next: End

ALWAYS ON

Next: End

FUSE

INTERFACE - 230V CONTROLS

Next: End

F17

Next: End

F17 IRIS

Next: End

FUSE F1 IRIS

INTERFACE - 230V CONTROLS

Next: End

FUSE F1 IRIS

PUMP

Next: End

FUSE F1 IRIS

SUPPLY - DC FAN

Next: End

BLOWING FUSES

MOTOR - 3 WAY VALVE

Next: End

FUSE F1 IRIS

MOTOR - 3 WAY VALVE

Next: End

FUSE F1 IRIS

IGNITOR UNIT

Next: End

BLOWN FUSE

IGNITOR UNIT

Next: End

PREHEAT NOISY FAULTY 2

Next: End

PREHEAT NOISY FAULTY 2

Next: End

PREHEAT NOISY NO CH NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

PREHEAT NOISY NO CH

CARD - INTERFACE

Next: End

PUMP OVERRUN

MAIN PCB

Next: End

1F5

THERMISTOR - HEATING FLOW RETURN

Next: End

1F5/F9

THERMISTOR - HEATING FLOW RETURN

Next: End

1F5 FAULT

THERMOSTAT - OVERHEAT

Next: End

OVERHEAT NOT SHUTTING OFF NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

1CH CALIBRATION 2F5

CARD - INTERFACE

Next: End

1CH DEMAND 2F5

CARD - INTERFACE

Next: End

1F5CHOKED

FILTER - CENTRAL HEATING

Next: End

FUSE F1 IRIS

GAS VALVE

Next: End

BLOWING FUSE

GAS VALVE

Next: End

CALIBRATION 1

THERMISTOR - HEATING FLOW RETURN

Next: End

CALIBRATION 1

THERMISTOR - HEATING FLOW RETURN

Next: End

NO FAN UNIVERSAL DISPLAY NO CARD

CARD - INTERFACE

Next: End

NO FAN NO CARD

CARD - INTERFACE

Next: End

F3 NO VOLTAGE

MAIN PCB

Next: End

FLOW RATE

COLD WATER SUPPLY

Next: End

F9 FLASHING FAULT

SENSOR - PRESSURE

Next: End

FAULT CODE F9

THERMISTOR - HEATING FLOW RETURN

Next: End

FAULT CODE F9 2

THERMISTOR - HEATING FLOW RETURN

Next: End

FAULT CODE F9

THERMOSTAT - OVERHEAT

Next: End

F9 FAULT CODE

SENSOR - PRESSURE

Next: End

DHW RUNS HOT THEN COLD 2

HEAT EXCHANGER - PLATE TO PLATE

Next: End

DHW RUNS HOT COLD NEW DISPLAY BOARD 2

CARD - INTERFACE

Next: End

DHW RUNS HOT THEN COLD 2

CARD - INTERFACE

Next: End

F5 FA

PRIMARY HEAT EXCHANGER

Next: End

OVERHEAT TEMP HIGH NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

1CH CALIBRATION 2F5F5 FA

CARD - INTERFACE

Next: End

NO DISPLAY 3

MAIN PCB

Next: End

NO DISPLAY 2

MAIN PCB

Next: End

NO DISPLAY

MAIN PCB

Next: End

F5 FAULTF5 FAULT

THERMOSTAT - OVERHEAT

Next: End

PREHEAT OC

THERMOSTAT - OVERHEAT

Next: End

OC 1

THERMOSTAT - OVERHEAT

Next: End

OC 19999

THERMOSTAT - OVERHEAT

Next: End

OC 4

THERMOSTAT - OVERHEAT

Next: End

OC 49999

THERMOSTAT - OVERHEAT

Next: End

FAULT 4F14

PUMP

Next: End

FAULT 5

PUMP

Next: End

FLASHING DISPLAY (SYMS)

MAIN PCB

Next: End

DISPLAY FLASHING

CARD - INTERFACE

Next: End

FLASHING DISPLAY IRIS PCB

HARNESS - INTERFACE

Next: End

NO DISPLAY IRIS

HARNESS - INTERFACE

Next: End

FAULTY9999

CARD - INTERFACE

Next: End

FAULT CODE F12/13 3

MAIN PCB

Next: End

DEMAND FAULT 4F11 F12

CARD - INTERFACE

Next: End

FAULT CODE F12/13

MAIN PCB

Next: End

F12 IRIS SYMS PCB

MAIN PCB

Next: End

BLOWING FUSE

FLOW SENSOR - DHW C/W CABLE

Next: End

BLOWING FUSE

SENSOR - PRESSURE

Next: End

F13

WIRING HARNESSES

Next: End

FAULT CODE 11 F13

HARNESS - INTERFACE

Next: End

FAULT CODE F11/12 F13

MAIN PCB

Next: End

DEMAND FAULT 4F11 F12 F13

CARD - INTERFACE

Next: End

FAULT CODE F12/13 2

MAIN PCB

Next: End

F12 IRIS SYMS PCB F13

MAIN PCB

Next: End

FAULT CODE F9

THERMISTOR DHW

Next: End

OVERHEAT INVESTIGATION

THERMISTOR DHW

Next: End

COMBUSTION

CONDENSATE DRAIN ASSEMBLY

Next: End

BLOCKED999RATIO

FLUE

Next: End

COMBUSTION

BURNER

Next: End

FLUEWAYS

PRIMARY HEAT EXCHANGER

Next: End

DHW 0PERATION 2WATER COOL RADS COOL

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW CALIBRATION 3WATER COOL RADS COOL

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW CALIBRATION 4WATER COOL RADS COOL

THERMISTOR DHW

Next: End

DHW TOO COOL RADS COOL NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

PRIMARY FAULTNEW DISPLAY PCB

HEAT EXCHANGER - PLATE TO PLATE

Next: End

DHW CALIBRATION 2WATER COOL RADS COOL

CARD - INTERFACE

Next: End

PRIMARY FAULT

HEAT EXCHANGER - PLATE TO PLATE

Next: End

CH OPERATION 2

THERMISTOR - HEATING FLOW RETURN

Next: End

CH CALIBRATION

THERMISTOR - HEATING FLOW RETURN

Next: End

RADS DO NOT HEAT NEW DISPLAY BOARD

CARD - INTERFACE

Next: End

CHOKEDNEW DISPLAY PCB

FILTER - CENTRAL HEATING

Next: End

CH CALIBRATION

CARD - INTERFACE

Next: End

CHOKED

FILTER - CENTRAL HEATING

Next: End

CH OPERATION 3

THERMISTOR - HEATING FLOW RETURN

Next: End

CH CALIBRATION 3

THERMISTOR - HEATING FLOW RETURN

Next: End

RADS DO NOT HEAT NEW DISPLAY BOARD 2

CARD - INTERFACE

Next: End

CHOKEDNEW DISPLAY PCB 2

FILTER - CENTRAL HEATING

Next: End

CH CALIBRATION 2

CARD - INTERFACE

Next: End

CHOKED 2

FILTER - CENTRAL HEATING

Next: End

CH OPERATION 2F14

THERMISTOR - HEATING FLOW RETURN

Next: End

CH CALIBRATIONF14

THERMISTOR - HEATING FLOW RETURN

Next: End

F5 FAF14

PRIMARY HEAT EXCHANGER

Next: End

OVERHEAT NOT SHUTTING OFF NEW DISPLAY BOARDF14

CARD - INTERFACE

Next: End

1CH CALIBRATION 2F5F14

CARD - INTERFACE

Next: End

NO POWER TO DV

MAIN PCB

Next: End

BLOCKED

SANI BLOCK

Next: End

1F5CHOKEDF14F14

FILTER - CENTRAL HEATING

Next: End

BLOCKED F14

INTEGRAL BYPASS

Next: End

CH OPERATION

THERMISTOR - HEATING FLOW RETURN

Next: End

CH CALIBRATION 2

THERMISTOR - HEATING FLOW RETURN

Next: End

CH INSUFF HEATNEW DISPLAY BOARD

CARD - INTERFACE

Next: End

INSUFF HEAT

CARD - INTERFACE

Next: End

BLOCKED 2

CONDENSATE DRAIN ASSEMBLY

Next: End

FLAME SENSE

LEAD - IGNITION

Next: End

ELECTRODE RECTIFICATION

ELECTRODE - SPARK

Next: End

FLUEWAYS SHUTTING OFF

PRIMARY HEAT EXCHANGER

Next: End

FAULTY

FLUE

Next: End

NOT ESTABLISHING

GAS VALVE SETTINGS

Next: End

RECTIFICATION

IGNITOR UNIT

Next: End

INSPECTION FLUE COLLECTOR AND SEALS

FLUE COLLECTOR / SEALS

Next: End

BLOCKED999

CONDENSATE DRAIN ASSEMBLY

Next: End

BLOCKED999

FLUE

Next: End

NO VOLTAGE TO GAS VALVE

PCB + GAS VALVE

Next: End

GAP

ELECTRODE - SPARK

Next: End

BURNER IGNITION - DOES NOT IGNITE - LOW PRESSURE

PRIMARY HEAT EXCHANGER

Next: End

PART BLOCKED OR DAMAGED

BURNER

Next: End

FAULTY

COCK - DCW

Next: End

BLOCKAGE OR DAMAGE

FILTER HOT WATER

Next: End

BLOCKAGE OR DAMAGE

DHW FLOW RESTRICTOR (FITTINGS PACK)

Next: End

FAULTY

SENSOR - PRESSURE

Next: End

PREHEAT DEMAND

CARD - INTERFACE

Next: End

SPARK GENERATOR FUNCTION

MAIN PCB

Next: End

DAMAGE

ELECTRODE - SPARK

Next: End

PREHEAT CALIBRATION

THERMISTOR DHW

Next: End

PREHEAT CALIBRATION

THERMISTOR - HEATING FLOW RETURN

Next: End

PREHEAT CALIBRATION

THERMISTOR - HEATING FLOW RETURN

Next: End

FAULT 2

PUMP

Next: End

DV FUNCTION

MAIN PCB

Next: End

DHW OPERATION

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW CALIBRATION

THERMISTOR - HEATING FLOW RETURN

Next: End

DHW CALIBRATION

THERMISTOR DHW

Next: End

DHW CALIBRATION

CARD - INTERFACE

Next: End

DV FUNCTION 2

MAIN PCB

Next: End

FAULTY

INTEGRAL BYPASS

Next: End

FAULT 3

PUMP

Next: End

CH DEMAND 2

CARD - INTERFACE

Next: End

FAULT 4

PUMP

Next: End

DV FUNCTION 3

MAIN PCB

Next: End

FAN CONTROL 2

MAIN PCB

Next: End

FAN CONTROL 29999

MAIN PCB

Next: End

FAULT F6

MAIN PCB

Next: End

F6 FAULT CODE

HARNESS CONTROL

Next: End

FAULT F6F10 FAULT

MAIN PCB

Next: End

F6 FAULT CODEF10 FAULT

HARNESS CONTROL

Next: End

F7FAULT F6

MAIN PCB

Next: End

F7F6 FAULT CODE

HARNESS CONTROL

Next: End

FAULT F16

MAIN PCB

Next: End

F5 FAULT

PUMP

Next: End

F19F6 FAULT CODE

HARNESS CONTROL

Next: End

FAULT F6F10 FAULTF19

MAIN PCB

Next: End

F6 FAULT CODEF10 FAULTF19

HARNESS CONTROL

Next: End

DHW RUNS HOT THEN COLD

MAIN PCB

Next: End

PREHEAT NEW DISPLAY BOARD

MAIN PCB

Next: End

DHW TOO HOT NEW DISPLAY BOARD

MAIN PCB

Next: End

DHW RUNS HOT COLD NEW DISPLAY BOARD

MAIN PCB

Next: End

ELECTRICAL

FLOW SENSOR - DHW C/W CABLE

Next: End

NO DHW DEMAND NEW DISPLAY BOARD

MAIN PCB

Next: End

DHW DEMAND

MAIN PCB

Next: End

F2 F3 FAULT

MAIN PCB

Next: End

FAULTY

SWITCH - RESET

Next: End

FAULTY9999

SWITCH - RESET

Next: End

NO VOLTAGE TO CONTROL PCB

MAIN PCB

Next: End

NO CH NEW DISPLAY BOARD

MAIN PCB

Next: End

NO CH

MAIN PCB

Next: End

NO CH DEMAND

INTERFACE - 230V CONTROLS

Next: End

NO CH DEMAND LOW VOLTAGE

INTERFACE - 230V CONTROLS

Next: End

F1 LOCKOUT

MAIN PCB

Next: End

FAULTY

CARD - INTERFACE

Next: End

USER BOARD CONTROL INFO 1

SYSTEM CHECKS

Next: End

FAN SPEED CONTROL

MAIN PCB

Next: End

FAN RUN PREHEAT

SUPPLY - DC FAN

Next: End

PREHEAT FAN RUN

MAIN PCB

Next: End

PREHEAT DEMAND

FAN ASSEMBLY

Next: End

FAN RUN PREHEAT 2

SUPPLY - DC FAN

Next: End

FUSE FURTHER INVESTIGATION

Z BLANK

Next: End

NO VOLTAGE IRISIRIS PCB

Next: End

FUSE FURTHER INVESTIGATIONIRIS PCB

Z BLANK

Next: End

SYMS PCB

Next: End

FUSE INVESTIGATION 1A

Z BLANK

Next: End

FUSE INVESTIGATION 1AFUSE IRIS

Z BLANK

Next: End

PERMANENT DEMAND LOW VOLTAGE

INTERFACE - 230V CONTROLS

Next: End

PERMANENT DEMAND 240

INTERFACE - 230V CONTROLS

Next: End

CYCLING CH

MAIN PCB

Next: End

F17 IRIS

MAIN PCB

Next: End

F17

MAIN PCB SYMS

Next: End

FUSE BLOWN

HARNESS - IGNITION

Next: End

FUSE BLOWN IRIS

HARNESS - IGNITION

Next: End

SPARK GEN IRIS

HARNESS - IGNITION

Next: End

SPARK GENERATOR

HARNESS - IGNITION

Next: End

SECONDARY FAULT

HEAT EXCHANGER - PLATE TO PLATE

Next: End

FAULT

PRIMARY HEAT EXCHANGER

Next: End

PREHEAT NOISY NO VOLTAGE TO CONTROL PCB

MAIN PCB

Next: End

PREHEAT NOISY NO CH DEMAND LOW VOLTAGE

INTERFACE - 230V CONTROLS

Next: End

PREHEAT NOISY NO CH DEMAND

INTERFACE - 230V CONTROLS

Next: End

PREHEAT NOISY NO CH NEW DISPLAY BOARD

MAIN PCB

Next: End

PREHEAT NOISY NO CH

MAIN PCB

Next: End

OVERHEAT

HARNESS CONTROL

Next: End

OVERHEAT2

HARNESS CONTROL

Next: End

OVERHEAT

TEMPERATURE OVERHEAT

Next: End

1FAULT F5

MAIN PCB

Next: End

OVERHEAT NOT SHUTTING OFF NEW DISPLAY BOARD

MAIN PCB

Next: End

1CH CALIBRATIONF5

MAIN PCB

Next: End

1FAULT 4F5

MOTOR - 3 WAY VALVE

Next: End

1DV FUNCTION 3F5

MAIN PCB

Next: End

1F5FAULT 2

Next: End

IRIS FUSE

HARNESS CONTROL

Next: End

SYMS FUSE

HARNESS CONTROL

Next: End

NO FAULT

FUSE INVESTIGATION SYMS PCB

Next: End

NO FAN OPERATION 2

FAN ASSEMBLY

Next: End

NO FAN OPERATION

FAN ASSEMBLY

Next: End

FAULT CODE F2- F3

MAIN PCB

Next: End

F3 FAULT CODE 2

FAN ASSEMBLY

Next: End

F3 FAULT CODE

FAN ASSEMBLY

Next: End

NO FAN OPERATION 3

FAN ASSEMBLY

Next: End

NO FAN OPERATION 4

FAN ASSEMBLY

Next: End

FAULT CODE F9

Z BLANK

Next: End

FAULT CODE F9

HARNESS CONTROL

Next: End

FAULT CODE F9 2

HARNESS CONTROL

Next: End

FAULT CODE F9 2

Z BLANK

Next: End

F9 FAULT CODE

MAIN PCB

Next: End

DHW RUNS HOT COLD NEW DISPLAY BOARD 2

MAIN PCB

Next: End

DHW RUNS HOT THEN COLD 2

MAIN PCB

Next: End

F5

THERMOSTAT - OVERHEAT

Next: End

F5

HEAT EXCHANGER - PLATE TO PLATE

Next: End

OVERHEAT TEMP HIGH NEW DISPLAY BOARD

MAIN PCB

Next: End

1CH CALIBRATIONF5F5 FA

MAIN PCB

Next: End

NO DISPLAY B2

SENSOR - PRESSURE

Next: End

NO DISPLAY B2

FAN ASSEMBLY

Next: End

NO DISPLAY IRIS PCB

FLOW SENSOR - DHW C/W CABLE

Next: End

FAULT CODE F5

HARNESS CONTROL

Next: End

FAULT F5F5 FAULT

MAIN PCB

Next: End

PUMP DOES NOT RUN PREHEAT

HARNESS CONTROL

Next: End

FAN DOES NOT RUN PREHEAT

HARNESS CONTROL

Next: End

FAN DOES NOT RUN PREHEAT 2

HARNESS CONTROL

Next: End

FAN DOES NOT RUN PREHEAT 3

HARNESS CONTROL

Next: End

FAN DOES NOT RUN PREHEAT 4

HARNESS CONTROL

Next: End

FAN FUNCTION 1

MAIN PCB

Next: End

FAN FUNCTION 19999

MAIN PCB

Next: End

FAULT CODE F5

SYSTEM LEAKS

Next: End

FAULT CODE F14

SYSTEM LEAKS

Next: End

FAULT CODE F5

SENSOR - PRESSURE

Next: End

FAULT CODE F5 3

SENSOR - PRESSURE

Next: End

F5 FAULT CODE

BLOCK PUMP

Next: End

FAULT CODE F14

SENSOR - PRESSURE

Next: End

FAULT CODE F14 3

SENSOR - PRESSURE

Next: End

F14 FAULT CODE

BLOCK PUMP

Next: End

FAULT CODE F5 5

SENSOR - PRESSURE

Next: End

FAULT CODE F5 4

SENSOR - PRESSURE

Next: End

F5 FAULT CODDE 2

BLOCK PUMP

Next: End

FAULT CODE F5 6

SENSOR - PRESSURE

Next: End

FAULT CODE F5 7

SENSOR - PRESSURE

Next: End

F5 FAULT CODE 3

BLOCK PUMP

Next: End

FAULT CODE F14 2

SYSTEM LEAKS

Next: End

FAULT CODE F5 8

SENSOR - PRESSURE

Next: End

FAULT CODE F5 9

SENSOR - PRESSURE

Next: End

F5 FAULT CODE 4

BLOCK PUMP

Next: End

FAULT CODE F14 5

SENSOR - PRESSURE

Next: End

FAULT CODE F14 4

SENSOR - PRESSURE

Next: End

F14 FAULT CODE 2

BLOCK PUMP

Next: End

BLANK DISPLAY IRIS PCB

MAIN PCB

Next: End

F12

FLOW SENSOR - DHW C/W CABLE

Next: End

NO FAULT 2

FUSE INVESTIGATION IRIS PCB

Next: End

NO DEMAND TO FAN

MAIN PCB

Next: End

NO DEMAND TO FAN 2

MAIN PCB

Next: End

NO DEMAND TO FAN 3

MAIN PCB

Next: End

NO DEMAND TO FAN 4

MAIN PCB

Next: End

F13 RESET

SYSTEM CHECKS

Next: End

F13

FLOW SENSOR - DHW C/W CABLE

Next: End

BLOWING FUSE

MAIN PCB

Next: End

F11 / F13 IRIS

MAIN PCB - CONNECTION FAULT

Next: End

F11 / F13 SYMS

MAIN PCB - CONNECTION FAULT

Next: End

F8 / F12 IRIS

MAIN PCB - CONNECTION FAULT

Next: End

F8 / F12 SYMS

MAIN PCB - CONNECTION FAULT

Next: End

JUMBLED DISPLAY - IRIS

MAIN PCB - CONNECTION FAULT

Next: End

JUMBLED DISPLAY - SYMS

MAIN PCB - CONNECTION FAULT

Next: End

FAULT CODE F9

MAIN PCB

Next: End

FAULT CODE F9 DHW SENSOR

HARNESS CONTROL

Next: End

OVERHEAT INVESTIGATION

HARNESS CONTROL

Next: End

COMBUSTION

GAS VALVE SETTINGS

Next: End

DHW CALIBRATION 2WATER COOL RADS COOLNEW DISPLAY PCB

MAIN PCB

Next: End

DHW CALIBRATION 2WATER COOL RADS COOL

MAIN PCB

Next: End

FAULT 2NEW DISPLAY PCB

Next: End

FAULT 2

Next: End

FAULT 2NEW DISPLAY PCB 2

Next: End

FAULT 3

Next: End

F5F14

HEAT EXCHANGER - PLATE TO PLATE

Next: End

1FAULT F5F14

MAIN PCB

Next: End

OVERHEAT NOT SHUTTING OFF NEW DISPLAY BOARDF14

MAIN PCB

Next: End

1CH CALIBRATIONF5F14

MAIN PCB

Next: End

FAULT 4F14

MOTOR - 3 WAY VALVE

Next: End

1F5FAULT 2F14F14

Next: End

OVERHEATF14

TEMPERATURE OVERHEAT

Next: End

CH INSUFF HEAT NEW DISPLAY BOARD

MAIN PCB

Next: End

CH INSUFF HEAT

MAIN PCB

Next: End

FLAME SENSE FUNCTION

MAIN PCB

Next: End

POOR 3

GAS SUPPLY

Next: End

NOT PASSING

GAS VALVE

Next: End

GASVALVE FUNCTION

MAIN PCB

Next: End

NO IGNITION

GAS VALVE SETTINGS

Next: End

DHW FLOW RATE

HEAT EXCHANGER - PLATE TO PLATE

Next: End

FAULTY

PUMP

Next: End

CHECK AND REPAIR AS NECESSARY

SYSTEM LEAKS

Next: End

SYSTEM PRESSURE

MAIN PCB

Next: End

PREHEAT FUNCTION

MAIN PCB

Next: End

FAULT

IGNITOR UNIT

Next: End

DAMAGE

LEAD - IGNITION

Next: End

FAULT 2

SANI BLOCK

Next: End

FAULT 2

MOTOR - 3 WAY VALVE

Next: End

FAULT

EXPANSION VESSEL

Next: End

DHW CALIBRATION

MAIN PCB

Next: End

FAULT 3

SANI BLOCK

Next: End

FAULT 3

MOTOR - 3 WAY VALVE

Next: End

FAULT

Next: End

FAULT 4

MOTOR - 3 WAY VALVE

Next: End

SYMS17 0 AS STANDARD NO CONTROLLER OR CARD

CHARACTERISTIC TEST FROM TYPE OF FAN CONTROL

Next: p1145

SYMS17 0 AS MOD WITH CARD

CHARACTERISTIC TEST FROM TYPE OF FAN CONTROL

Next: p1126

DHW RUNS HOT THEN COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1868

DISPLAY NOT ILLUMINATED

CHARACTERISTIC TEST FROM DISPLAY

Next: p2120

DISPLAY ILLUMINATES BUT FLASHES OR DOES NOT SHOW CORRECT INFORMATION

CHARACTERISTIC TEST FROM DISPLAY

Next: p3698

20V OR GREATER MEASURED ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CONTROLS PCB DEMAND

Next: p2199

LESS THAN 2V MEASURED ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CONTROLS PCB DEMAND

Next: !p2181

BOILER GOES TO F1 FAULT CODE WITHOUT 3 ATTEMPTS TO IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITION (PREHEAT)

Next: p2284

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION DOES FAN RUN BEFORE FAULT

Next: p2298

FAN RUNS ON HIGH SPEED WITH NO DEMAND

CHARACTERISTIC TEST FROM OBSERVATION DOES FAN RUN BEFORE FAULT

Next: p2297

BOILER DOES NOT OPERATE WITH CH DEMAND

CHARACTERISTIC TEST FROM CH NOISY OPERATION TEST

Next: p3198

BOILER OPERATES BUT IS STILL NOISY

CHARACTERISTIC TEST FROM CH NOISY OPERATION TEST

Next: !p3200

20V OR GREATER MEASURED ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CONTROLS PCB DEMAND

Next: p3203

LESS THAN 2V MEASURED ON BOTH TESTS

CHARACTERISTIC TEST FROM VOLTAGE CONTROLS PCB DEMAND

Next: !p3205

BOILER TEMP RISES RAPIDLY

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3254

BOILER TEMP GOES ABOVE 87 DEGREES AND DOESNT CUT OFF

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3256

BOILER LOCKS OUT ON OVERHEAT BEFORE REACHING 87 DEGREES

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3258

VOLTAGE BEHAVES AS DESCRIBED

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3288

VOLTAGE ABSENT ( LESS THAN 1 VDC, E G 0 VDC)

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3290

VOLTAGE BEHAVES AS DESCRIBED

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3332

VOLTAGE ABSENT ( LESS THAN 1 VDC, E G 0 VDC)

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3334

VOLTAGE BEHAVES AS DESCRIBED

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3337

VOLTAGE ABSENT ( LESS THAN 1 VDC, E G 0 VDC)

CHARACTERISTIC TEST FROM VOLTAGE FAN CONTROL

Next: !p3339

BOILER SHOWS FAULT CODE OR HW TEMPERATURE EXCEEDS 65 DEGREES

CHARACTERISTIC TEST FROM HW TEST OVERHEAT

Next: p3401

HW TEMPERATURE RUNS HOT THEN COOL

CHARACTERISTIC TEST FROM HW TEST OVERHEAT

Next: p3392

DIFFERENTIAL OK BUT TEMPERATURE EXCESSIVELY HIGH

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3404

DIFFERENTIAL NOT OK

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3406

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3601

SYSTEM PRESSURE CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3598

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3613

SYSTEM PRESSURE CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3610

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3621

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3623

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3627

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3629

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3648

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3650

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3654

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3656

SYSTEM PRESSURE LOW

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3679

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3684

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3686

SYSTEM PRESSURE CORRECT BUT DOES NOT INCREASE

CHARACTERISTIC TEST FROM OBSERVATION SYSTEM PRESSURE

Next: p3688

PRESSURE SENSOR RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3692

PUMP BLOCK RESTRICTED / BLOCKED

CHARACTERISTIC TEST FROM INSPECTION PRESSURE SENSOR

Next: !p3694

BOILER TEMP RISES RAPIDLY

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3968

BOILER TEMP GOES ABOVE 87 DEGREES AND DOESNT CUT OFF

CHARACTERISTIC TEST FROM CH TEST OVERHEAT

Next: p3970

BOILER LOCKS OUT BEFORE REACHING 87 DEGREES

CHARACTERISTIC TEST FROM CH TEST F14

Next: !p3972

INLET PRESSURE DOES NOT DIP TO INDICATE GAS VALVE IS OPENING

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DIP

Next: p4029

INLET PRESSURE UNSATISFACTORY

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DIP

Next: !p4031

SPARKING PRESENT BUT BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM BURNER IGNITION (PREHEAT)

Next: p4022

SPARKING ABSENT

CHARACTERISTIC TEST FROM BURNER IGNITION (PREHEAT)

Next: p657

BOILER NOISY (KETTLING)

CHARACTERISTIC TEST FROM PREHEAT ESTABLISHES AND COMPLETES

Next: p696

PREHEAT DOES NOT COMPLETE RADS HEAT

CHARACTERISTIC TEST FROM PREHEAT ESTABLISHES AND COMPLETES

Next: p698

BURNER DOES NOT ESTABLISH PRE HEAT SHUTS DOWN PREMATURELY

CHARACTERISTIC TEST FROM PREHEAT ESTABLISHES AND COMPLETES

Next: p2799

DHW TOO HOT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p891

DHW TOO COOL, RADIATORS COLD

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p1822

CH NOISY OPERATION

CHARACTERISTIC TEST FROM CH OPERATION

Next: p818

RADIATORS DO NOT HEAT BUT BOILER REACHES TEMPERATURE

CHARACTERISTIC TEST FROM CH OPERATION

Next: p820

BOILER AND RADIATORS INSUFFICIENT HEAT

CHARACTERISTIC TEST FROM CH OPERATION

Next: p3994

BOILER WILL NOT FIRE FOR HEATING DEMAND

CHARACTERISTIC TEST FROM CH OPERATION

Next: p2161

SYSTEM PRESSURE RISE EXCESSIVE

CHARACTERISTIC TEST FROM CH OPERATION

Next: !p826

DHW COOL RADS HEAT

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p968

08/06/2021 15:39:04 2106_1_50_1 14/07/2021 11:26:07

05/07/2021 08:49:32

Next: End

WHICH TYPE OF FAN CONTROL PRESENT

{ISOLATEMAINSPOWER}<

Next: p2347, ?1123, ?1125

FAN VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p1326, f1187

FAN LOOM CONTINUITY

{ISOLATEMAINSPOWER}
REMOVE THE FAN LOOM FROM THE PCB (J4) AND THE FAN

Next: !p1188, !f1189

IS MOD CARD PRESENT

{ISOLATEMAINSPOWER}

Next: p1215, !f1214

FAN LOOM CONTINUITY

{ISOLATEMAINSPOWER}
REMOVE THE FAN LOOM FROM THE PCB (J4) AND THE FAN

Next: !p1218, !f1219

RESISTANCE THERMISTOR FLOW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: !p1359, f1360

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: !p1361, !f1362

RESISTANCE THERMISTOR RETURN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: !p1365, f1366

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: !p1367, !f1375

RESISTANCE THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J4 FROM THE PCB

Next: !p1371, f1372

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: !p1373, !f1376

RESISTANCE HARNESS USER INTERFACE

{ISOLATEMAINSPOWER}
REMOVE THE HARNESS FROM THE MAIN PCB TO THE USER CONTROL PCB

Next: p3733, !f1379

INSPECTION BURNER GAS SHUTDOWN

C/H DEMAND OFF

Next: !p1390, !f1391

BOILER RESET

{ISOLATEMAINSPOWER}<

Next: p3520, f3435

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p1527, !f1528

RESISTANCE THERMISTOR FLOW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p1789, f1790

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: !p1791, !f1792

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: !p1795, !f1796

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p3762, !f1903

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p1916, !f1917

INFORMATION UNIVERSAL DISPLAY BOARD HXI AND 330

Next: !p2292, !f2293

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p1975, !f1976

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p1993, !f1994

VOLTAGE FLOW SWITCH DEMAND

{ISOLATEMAINSPOWER}<

Next: p2039, f2040

VOLTAGE PERMANENT TO FLOW SWITCH

Next: p2041, !f2042

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p2055, !f2056

FAN LOOM CONTINUITY

{ISOLATEMAINSPOWER}
REMOVE THE FAN LOOM FROM THE PCB (J4) AND THE FAN

Next: p2083, !f2088

VOLTAGE TO MAIN PCB (SYMS)

Next: p2123, f2124

VOLTAGE BOILER ON OFF SWITCH

{ISOLATEMAINSPOWER}<

Next: !p2125, f2670

VOLTAGE BOILER ON OFF SWITCH

{ISOLATEMAINSPOWER}<

Next: !p2137, f2665

EXTERNAL CONTROLS LOW VOLTS RESISTANCE

{ISOLATEMAINSPOWER}

Next: !p2244, !f2203

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p2225, !f2226

FAN DC SUPPLY (INPUT VOLTAGE)

{ISOLATEMAINSPOWER}<

Next: !p2350, !f2351

FAN VOLTAGE J4 DISCONNECTED

{ISOLATEMAINSPOWER}<

Next: !p2354, f2355

FUSE F2 RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE FUSE F2 FROM ITS HOLDER IN THE
FAN DC SUPPLY CONTROL UNIT

Next: !p2356, !f2759

RESISTANCE MAINS FUSE (3AMP)

{ISOLATEMAINSPOWER}
REMOVE FUSE FROM FUSED SPUR

Next: !p2675, f2667

FUSE FURTHER INVESTIGATION MAINS 3A (HYPERLINK) IRIS

Next: !p2668, !f2745

RESISTANCE MAINS FUSE (3AMP)

{ISOLATEMAINSPOWER}
REMOVE FUSE FROM FUSED SPUR

Next: !p2671, f2672

FUSE FURTHER INVESTIGATION MAINS 3A

Next: !p2673, !f2744

RESISTANCE CONTROLS INTERFACE

{ISOLATEMAINSPOWER}<

Next: p2678, !f2985

FUSE FURTHER INVESTIGATION IRIS

Next: !p2751, !f2756

FUSE FURTHER INVESTIGATION

Next: !p2754, !f2755

IDENTIFY PCB

{ISOLATEMAINSPOWER}
REMOVE CONTROL BOX COVER

Next: p2831, f2832

VOLTAGE TO MAIN PCB (SYMS)

Next: !p3044, !f3045

VOLTAGE CONTROL PCB NO DEMAND

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB
USE INSULATION MAT AS REQUIRED

Next: !p2971, f2964

EXTERNAL CONTROLS

{ISOLATEMAINSPOWER}

Next: p2965, f2966

EXTERNAL CONTROLS LOW VOLTS RES NO DEMAND

{ISOLATEMAINSPOWER}

Next: !p2967, !f2968

RESISTANCE CONTROLS INTERFACE IRIS

{ISOLATEMAINSPOWER}<

Next: p3049, !f3073

RESISTANCE DIVERTER VALVE

{ISOLATEMAINSPOWER}<

Next: !p3093, !f3081

RESISTANCE DIVERTER VALVE

{ISOLATEMAINSPOWER}<

Next: !p3095, !f3096

RESISTANCE SPARK GENERATOR

{ISOLATEMAINSPOWER}
REMOVE ELECTRICAL CONNECTORS FROM SPARK GENERATOR.

Next: !p3190, !f3191

RESISTANCE SPARK GENERATOR

{ISOLATEMAINSPOWER}
REMOVE ELECTRICAL CONNECTORS FROM SPARK GENERATOR.

Next: !p3193, !f3194

EXTERNAL CONTROLS LOW VOLTS RESISTANCE

{ISOLATEMAINSPOWER}

Next: !p3208, !f3209

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p3214, !f3215

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: !p3230, !f3231

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: !p3234, !f3235

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p3263, !f3264

DIVERTER VALVE VOLTS CH

{ISOLATEMAINSPOWER}<

Next: !p3269, f3270

CH SWITCH

{ISOLATEMAINSPOWER}<

Next: !p3271, !f3272

RESISTANCE GAS VALVE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE GAS VALVE

Next: !p3276, !f3277

RESISTANCE GAS VALVE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE GAS VALVE

Next: !p3279, !f3280

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p3760, !f3321

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: p3349, f3350

RESET OVERHEAT STAT

{ISOLATEMAINSPOWER}
ENSURE BOILER IS COOL
RESET OVERHEAT BY PUSHING IN RED BUTTON

Next: !p3351, f3382

SYSTEM PRESSURE SWITCH CHECK

{ISOLATEMAINSPOWER}<

Next: p3371, !f3356

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: !p3374, !f3375

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: !p3378, !f3379

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: p3385, !f3384

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: !p3397, !f3398

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p3411, !f3412

INSPECTION PCB CAPACITORS

{ISOLATEMAINSPOWER}

Next: !p3422, !f3423

INSPECTION PCB CAPACITORS

{ISOLATEMAINSPOWER}

Next: !p3425, !f3426

INSPECTION PCB CAPACITORS

{ISOLATEMAINSPOWER}

Next: !p3428, !f3429

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: !p3443, f3438

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3442, !f3440

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3445, !f3446

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3448, !f3449

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3451, !f3452

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3467, !f3468

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3472, !f3473

OBSERVATION SYSTEM PRESSURE

Next: p3480, ?3606, ?3608

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3646, ?3647, ?3649

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3652, ?3653, ?3655

OBSERVATION SYSTEM PRESSURE

Next: p3659, ?3678, ?3687

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3682, ?3683, ?3685

MAIN PCB TO DISPLAY PCB VOLTS

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p3834, !f3704

DHW FLOW SWITCH CONNECTOR

{ISOLATEMAINSPOWER}
DISCONNECT INLINE PLUG FROM PCB TO DHW FLOW SWITCH

Next: p3746, f3743

OBSERVATION CH OPERATION (FAULT)

SET CH TEMPERATURE SELECTOR TO MAX
ENSURE ALL HEATING CONTROLS ARE CALLING

Next: !p3744, !f3745

REFIT J2 DOES FUSE BLOW

{ISOLATEMAINSPOWER}
REFIT CONNECTOR J2
J1 STILL DISCONNECTED FROM PREVIOUS TEST

Next: p3755, !f3754

INSPECTION PCB AND CONNECTIONS

{ISOLATEMAINSPOWER}

Next: p3764, !f3765

RESISTANCE HARNESS USER INTERFACE

{ISOLATEMAINSPOWER}
REMOVE THE HARNESS FROM THE MAIN PCB TO THE USER CONTROL PCB

Next: p3768, !f3769

DHW FLOW SWITCH CONNECTOR

{ISOLATEMAINSPOWER}
DISCONNECT INLINE PLUG FROM PCB TO DHW FLOW SWITCH

Next: p3804, f3801

OBSERVATION CH OPERATION (FAULT)

SET CH TEMPERATURE SELECTOR TO MAX
ENSURE ALL HEATING CONTROLS ARE CALLING

Next: !p3802, !f3803

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: !p3838, !f3839

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: !p3895, !f3896

CONDENSATE SIPHON

{ISOLATEMAINSPOWER}

Next: p3901, !f3902

RESISTANCE DISPLAY PCB UNIVERSAL PREHEAT

{ISOLATEMAINSPOWER}<

Next: p3918, !f3919

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: p3933, !f3934

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: p3948, !f3949

DIFFERENTIAL HEAT EXCHANGER ON CH

{ISOLATEMAINSPOWER}<

Next: !p3963, !f3964

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p3975, !f3976

DIVERTER VALVE VOLTS CH

{ISOLATEMAINSPOWER}<

Next: !p3981, !f3982

RESISTANCE DISPLAY PCB UNIVERSAL CENTRAL HEATING

{ISOLATEMAINSPOWER}<

Next: !p4001, !f4002

RESISTANCE GAS VALVE

{ISOLATEMAINSPOWER}
DISCONNECT LEADS FROM THE GAS VALVE

Next: !p4034, !f4035

DHW SERVICE VALVE

{ISOLATEMAINSPOWER}

Next: p3340, !f600

PUMP VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p626, f627

SYSTEM CHARGE PRESSURE

Next: p628, f629

RECHARGE SYSTEM

{ISOLATEMAINSPOWER}

Next: !p630, f631

SYSTEM PRESSURE SWITCH CHECK

{ISOLATEMAINSPOWER}<

Next: !p632, !f633

SPARK GENERATOR (INPUT)

{ISOLATEMAINSPOWER}<

Next: !p685, !f686

DIVERTER VALVE VOLTS

{ISOLATEMAINSPOWER}<

Next: !p743, !f744

DIVERTER VALVE VOLTS

{ISOLATEMAINSPOWER}<

Next: !p971, !f972

DIVERTER VALVE VOLTS CH

{ISOLATEMAINSPOWER}<

Next: !p980, f982

CH SWITCH

{ISOLATEMAINSPOWER}<

Next: !p1037, !f984

HOW DOES FAN REACT

ENSURE THE BOILER IS COOL SO THAT THERE IS DEMAND FOR PREHEAT
SET DHW TEMPERATURE SELECTOR TO ECO

Next: p3459, f1213

HOW DOES FAN REACT

ENSURE THE BOILER IS COOL SO THAT THERE IS DEMAND FOR PREHEAT
SET DHW TEMPERATURE SELECTOR TO ECO

Next: p3453, f1185

FAN VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p1337, f1217

VOLTAGE FAN CONTROL

{ISOLATEMAINSPOWER}<

Next: p3311, ?3287, ?3289

VOLTAGE FAN CONTROL

{ISOLATEMAINSPOWER}<

Next: p1338, ?3336, ?3338

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p1340, !f1341

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p1342, !f1343

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: p1897, f3450

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p3761, !f1347

DOES PUMP RUN

Next: p1648, f1500

PUMP LIMPET TEST

Next: p3224, !f1681

RESISTANCE THERMISTOR RETURN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: !p1793, f1794

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p3909, !f1824

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p1869, !f1870

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p1871, !f1872

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: p1873, !f1874

PUMP LIMPET TEST

Next: p1875, !f1876

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: p1988, !f1878

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p1879, !f1880

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p1344, f1901

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p642, f1915

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p903, f1974

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p1877, f1992

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p2045, !f2046

RESISTANCE HARNESS FLOW SWITCH

{ISOLATEMAINSPOWER}<

Next: !p2043, !f2044

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p2047, !f2048

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: p2049, !f2050

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: p2051, !f2052

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p2053, f2054

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p2057, !f2058

OBSERVATION DOES FAN RUN BEFORE FAULT

ENSURE BOILER IS COOL SO THERE IS A DEMAND FOR PREHEAT
DHW TEMPERATURE CONTROL TO MINIMUM (0)

Next: p2084, ?2294, ?2296

VOLTAGE FAN HALL SENSOR

{ISOLATEMAINSPOWER}<

Next: !p2086, !f2087

IDENTIFY PCB

{ISOLATEMAINSPOWER}
REMOVE CONTROL BOX COVER

Next: p2121, f2122

VOLTAGE TO MAIN PCB

Next: p2135, f2136

FUSE F1 RESISTANCE (SYMS17.0)

{ISOLATEMAINSPOWER}
REMOVE FUSE F1 FROM ITS HOLDER ON THE MAIN PCB

Next: p2127, f2753

REMOVE WATER PRESSURE SWITCH (SYMS)

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB AND POSITION IT SAFELY AWAY FROM THE BOARD

Next: p2129, f3421

REMOVE FAN CONNECTOR (SYMS)

{ISOLATEMAINSPOWER}
REMOVE J4 CONNECTOR FROM THE PCB AND PLACE IT SAFELY AWAY FROM THE BOARD

Next: p2156, f3424

MAIN PCB TO DISPLAY PCB VOLTS

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: p2289, !f2134

FUSE F1 RESISTANCE

{ISOLATEMAINSPOWER}
REMOVE FUSE F1 FROM ITS HOLDER ON THE MAIN PCB

Next: p3728, f2750

RESISTANCE HARNESS USER INTERFACE

{ISOLATEMAINSPOWER}
REMOVE THE HARNESS FROM THE MAIN PCB TO THE USER CONTROL PCB

Next: p3705, !f3724

REMOVE FLOW SWITCH CONNECTOR (SYMS)

{ISOLATEMAINSPOWER}
REMOVE J2 CONNECTOR FROM THE PCB AND PLACE IT SAFELY AWAY FROM THE BOARD

Next: p2131, f3427

VOLTAGE CONTROLS PCB DEMAND

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB
USE INSULATION MAT AS REQUIRED

Next: p2222, ?2178, ?2180

EXTERNAL CONTROLS

{ISOLATEMAINSPOWER}

Next: p2200, f2201

EXTERNAL CONTROLS VOLTAGE (OUTPUT)

{ISOLATEMAINSPOWER}<

Next: !p2243, !f2207

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p2223, f2224

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p2227, !f2228

INSPECTION PCB AND CONNECTIONS

{ISOLATEMAINSPOWER}

Next: !p2286, !f2285

RESISTANCE HARNESS USER INTERFACE

{ISOLATEMAINSPOWER}
REMOVE THE HARNESS FROM THE MAIN PCB TO THE USER CONTROL PCB

Next: !p2290, !f2291

VOLTAGE FAN SPEED CONTROL

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB
USE INSULATION MAT AS REQUIRED

Next: !p2301, !f2302

FAN VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p2765, !f3327

FAN VOLTAGE

{ISOLATEMAINSPOWER}<

Next: p2348, f2349

FAN TEST (DISCONNECTED)

{ISOLATEMAINSPOWER}
DISCONNECT CONNECTOR MARKED J4 FROM THE
MAIN PCB AND MAKE SAFE

Next: !p2352, f2353

RESISTANCE PUMP

{ISOLATEMAINSPOWER}
REMOVE REAR CONTROL PANEL COVER TO EXPOSE MAIN PCB.

Next: p3079, !f2758

VOLTAGE FAN CONTROL (F3 FAULT CODE)

{ISOLATEMAINSPOWER}<

Next: !p3329, ?3331, ?3333

GAS INLET PRESSURE

{ISOLATEMAINSPOWER}
ATTACH PRESSURE GAUGE TO THE INLET PRESSURE TEST POINT

Next: p4005, !f2801

VOLTAGE TO MAIN PCB

Next: !p3043, !f3046

EXTERNAL CONTROLS VOLTAGE (OUTPUT) NO DEMAND

{ISOLATEMAINSPOWER}<

Next: !p2969, !f2970

RESISTANCE PUMP AND HARNESS IRIS

{ISOLATEMAINSPOWER}<

Next: p3051, !f3074

RESISTANCE DIVERTER VALVE AND HARNESS IRIS

{ISOLATEMAINSPOWER}<

Next: p3053, f3094

RESISTANCE GAS VALVE AND HARNESS IRIS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3055, f3275

RESISTANCE SPARK GENERATOR AND HARNESS IRIS

{ISOLATEMAINSPOWER}<

Next: p3070, f3189

RESISTANCE DC FAN CONTROLLER

{ISOLATEMAINSPOWER}
DISCONNECT FAN DC CONTROLLER CONNECTOR MARKED H3 ON THE MAIN PCB

Next: p3749, !f3078

RESISTANCE DIVERTER VALVE AND HARNESS

{ISOLATEMAINSPOWER}<

Next: p3082, f3080

RESISTANCE GAS VALVE AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3088, f3278

RESISTANCE SPARK GENERATOR AND HARNESS

{ISOLATEMAINSPOWER}<

Next: !p3282, f3192

CH NOISY OPERATION

SET CH TEMPERATURE S

Next: !p3196, ?3197, ?3199

VOLTAGE CONTROLS PCB DEMAND

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB
USE INSULATION MAT AS REQUIRED

Next: p3201, ?3202, ?3204

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3212, f3213

EXTERNAL CONTROLS

{ISOLATEMAINSPOWER}

Next: p3206, f3207

EXTERNAL CONTROLS VOLTAGE (OUTPUT)

{ISOLATEMAINSPOWER}<

Next: !p3210, !f3211

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p3216, !f3217

OBSERVATION PUMP OVERRUN

TURN DHW CONTROL TO 0 TO DEACTIVATE PREHEAT

Next: p3227, !f3226

RESISTANCE THERMISTOR FLOW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3228, f3229

RESISTANCE THERMISTOR RETURN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3840, f3233

DHW TEST OVERHEAT

TURN DHW THERMOSTAT TO MAX
USE PERFORMANCE TESTER TEMPERATURE PROBE TO MEASURE HW FROM TAPS

Next: p3236, ?3388, ?3390

CH TEST OVERHEAT

{ISOLATEMAINSPOWER}<

Next: !p3251, ?3253, ?3255, ?3257

DIVERTER HEAD OPERATION

{ISOLATEMAINSPOWER}<

Next: p3267, f3268

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3261, f3262

THERMOSTAT OVERHEAT

{ISOLATEMAINSPOWER}
DISCONNECT BLACK LEADS FROM THE OVERHEAT THERMOSTAT

Next: !p3259, !f3260

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p3265, !f3266

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3273, !f3274

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3312, !f3313

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3314, !f3315

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: p3316, f3447

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3318, f3319

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p3759, !f3323

OBSERVATION COLD WATER SUPPLY

Next: p599, !f3346

OBSERVATION BOILER RESET FAULT CODE F9

Next: !p3381, f3354

RESISTANCE THERMISTOR FLOW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3372, f3373

RESISTANCE THERMISTOR RETURN AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J1 FROM THE PCB

Next: p3835, f3377

SYSTEM PRESSURE SWITCH CHECK

{ISOLATEMAINSPOWER}<

Next: !p3386, !f3387

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: p3393, !f3394

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3395, f3396

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p3399, !f3400

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: !p3402, ?3403, ?3405

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3409, f3410

DIFFERENTIAL HEAT EXCHANGER ON CH

{ISOLATEMAINSPOWER}<

Next: !p3407, !f3408

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p3413, !f3414

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: !p3475, f3466

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: !p3478, f3471

PUMP LIMPET TEST

Next: p3956, !f3482

OBSERVATION SYSTEM PRESSURE

Next: p1498, ?3594, ?3596

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3618, ?3620, ?3622

RECHARGE SYSTEM

{ISOLATEMAINSPOWER}

Next: !p3602, f3645

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3625, ?3626, ?3628

RECHARGE SYSTEM

{ISOLATEMAINSPOWER}

Next: !p3614, f3651

PUMP LIMPET TEST

Next: p3941, !f3661

RECHARGE SYSTEM

{ISOLATEMAINSPOWER}

Next: !p3680, f3681

INSPECTION PRESSURE SENSOR

{ISOLATEMAINSPOWER}
DRAIN PRIMARY CIRCUIT OF BOILER
REMOVE PRESSURE SENSOR FROM PUMP BLOCK

Next: !p3689, ?3691, ?3693

IDENTIFY PCB

{ISOLATEMAINSPOWER}
REMOVE CONTROL BOX COVER

Next: p2148, f3702

RESISTANCE DISPLAY PCB (IRIS MAIN PCB)

{ISOLATEMAINSPOWER}<

Next: !p3833, !f3707

RESISTANCE HARNESS USER INTERFACE

{ISOLATEMAINSPOWER}
REMOVE THE HARNESS FROM THE MAIN PCB TO THE USER CONTROL PCB

Next: p3729, !f3730

RESISTANCE DISPLAY PCB (IRIS MAIN PCB)

{ISOLATEMAINSPOWER}<

Next: !p3731, !f3732

INSPECTION PCB CAPACITORS

{ISOLATEMAINSPOWER}

Next: p3734, !f3735

IDENTIFY PCB

{ISOLATEMAINSPOWER}
REMOVE CONTROL BOX COVER

Next: p3736, f3742

RESISTANCE DISPLAY PCB (IRIS MAIN PCB)

{ISOLATEMAINSPOWER}<

Next: !p3822, !f3741

MAIN PCB TO DISPLAY PCB VOLTS

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p3823, !f3748

REMOVE CONNECTORS AND REPLACE FUSE

{ISOLATEMAINSPOWER}<

Next: !p3807, f3751

REFIT J1 DOES FUSE BLOW

{ISOLATEMAINSPOWER}
REFIT CONNECTOR J1

Next: !p3758, !f3757

OBSERVATION BOILER RESET F13 FAULT

ON/OFF SWITCH ON

Next: !p3766, f3767

INSPECTION PCB CAPACITORS

{ISOLATEMAINSPOWER}

Next: p3789, !f3771

IDENTIFY PCB

{ISOLATEMAINSPOWER}
REMOVE CONTROL BOX COVER

Next: p3790, f3800

RESISTANCE DISPLAY PCB (IRIS MAIN PCB)

{ISOLATEMAINSPOWER}<

Next: !p3820, !f3795

MAIN PCB TO DISPLAY PCB VOLTS

{ISOLATEMAINSPOWER}
GAIN ACCESS TO PCB (USE INSULATION MAT AS NECESSARY)

Next: !p3821, !f3806

RESISTANCE THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J4 FROM THE PCB

Next: !p3836, f3837

RESISTANCE THERMISTOR DHW AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE THE CONNECTOR J4 FROM THE PCB

Next: p3232, f3894

INSPECTION FLUE

Next: p3903, !f3904

BURNER

{ISOLATEMAINSPOWER}

Next: p3905, !f3906

INSPECTION HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}
REMOVE FAN, GAS VALVE AND BURNER ASSEMBLY

Next: !p3907, !f3908

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3910, !f3911

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3912, !f3913

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: p3914, !f3915

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3916, f3917

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: p3922, !f3923

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: !p3920, !f3921

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: !p3924, !f3925

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3927, !f3928

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3929, !f3930

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3931, f3932

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: p3937, !f3938

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3935, !f3936

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3939, !f3940

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3942, !f3943

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3944, !f3945

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3946, f3947

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: p3952, !f3953

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3950, !f3951

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3954, !f3955

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3957, !f3958

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3959, !f3960

DIFFERENTIAL HEAT EXCHANGER ON DHW

{ISOLATEMAINSPOWER}<

Next: p3961, f3962

CH TEST F14

{ISOLATEMAINSPOWER}<

Next: p3965, ?3967, ?3969, ?3971

INTEGRAL BYPASS

SET DHW TEMPERATURE SELECTOR TO OFF

Next: !p3987, !f3988

DIVERTER HEAD OPERATION

{ISOLATEMAINSPOWER}<

Next: p3979, f3980

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3973, f3974

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p3977, !f3978

DIVERTER SPINDLE

{ISOLATEMAINSPOWER}<

Next: p3983, !f3984

CH FILTER CHECK

{ISOLATEMAINSPOWER}<

Next: !p3985, !f3986

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p3995, !f3996

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p3997, !f3998

OBSERVATION DISPLAY PCB TYPE

{ISOLATEMAINSPOWER}<

Next: p3999, f4000

DISPLAY PCB POTENTIOMETER (CH)

{ISOLATEMAINSPOWER}<

Next: !p4003, !f4004

CONDENSATE SIPHON

{ISOLATEMAINSPOWER}

Next: p4006, !f4007

ELECTRODE LEAD INSPECTION

{ISOLATEMAINSPOWER}

Next: p4008, !f4009

SPARK ELECTRODE

{ISOLATEMAINSPOWER}
REMOVE ELECTRODE ASSEMBLY

Next: p4010, !f4011

INSPECTION HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}
REMOVE FAN, GAS VALVE AND BURNER ASSEMBLY

Next: p4012, !f4013

FLUE CHECK

Next: p4014, !f4015

RESET GAS VALVE

{ISOLATEMAINSPOWER}<

Next: p4016, !f4017

RECTIFICATION VOLTAGE FROM SPARK GEN

{ISOLATEMAINSPOWER}<

Next: !p4018, !f4019

CONDENSATE SIPHON

{ISOLATEMAINSPOWER}

Next: p4024, !f4023

INSPECTION FLUE

Next: p4026, !f4025

PRESSURE GAS INLET AND DIP

{ISOLATEMAINSPOWER}<

Next: p4037, ?4028, ?4030

GAS VALVE VOLTAGE

{ISOLATEMAINSPOWER}<

Next: !p4032, f4033

SPARK ELECTRODE

{ISOLATEMAINSPOWER}
REMOVE ELECTRODE ASSEMBLY

Next: p4038, !f4039

INSPECTION HEAT EXCHANGER FLUEWAYS

{ISOLATEMAINSPOWER}
REMOVE FAN, GAS VALVE AND BURNER ASSEMBLY

Next: p4040, !f4041

BURNER

{ISOLATEMAINSPOWER}

Next: !p4042, !f4043

DHW INLET FILTER

{ISOLATEMAINSPOWER}<

Next: p601, !f602

DHW FLOW RESTRICTOR

{ISOLATEMAINSPOWER}<

Next: !p603, !f604

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p636, !f692

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p638, !f691

RESISTANCE OVERHEAT STAT AND HARNESS

{ISOLATEMAINSPOWER}
REMOVE CONNECTOR J1 FROM PCB

Next: p640, f3444

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: p1911, !f689

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p644, !f645

SPARK GENERATOR OUTPUT

{ISOLATEMAINSPOWER}<

Next: p683, f684

SPARK ELECTRODE

{ISOLATEMAINSPOWER}
REMOVE ELECTRODE ASSEMBLY

Next: !p687, !f688

PUMP LIMPET TEST

Next: p3195, !f702

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: !p741, f742

INTEGRAL BYPASS

SET DHW TEMPERATURE SELECTOR TO OFF

Next: p973, !f974

DIVERTER HEAD OPERATION

{ISOLATEMAINSPOWER}<

Next: p977, f979

FLOW THERMISTOR

{ISOLATEMAINSPOWER}
REMOVE THE BLUE LEADS FROM THE FLOW THERMISTOR

Next: p892, !f893

RETURN THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT WHITE WIRES FROM THE THERMISTOR

Next: p902, !f895

DHW THERMISTOR

{ISOLATEMAINSPOWER}
DISCONNECT THE HOT WATER THERMISTOR AT ITS INLINE CONNECTOR

Next: p1970, !f904

DISPLAY PCB POTENTIOMETER (PREHEAT)

{ISOLATEMAINSPOWER}<

Next: !p905, !f906

DIVERTER VALVE SPINDLE

{ISOLATEMAINSPOWER}<

Next: !p969, f970

PUMP LIMPET TEST

Next: !p975, !f976

PUMP LIMPET TEST

Next: p3926, !f986

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