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:

WORCESTER GREENSTAR I ERP

GLOBALLY REPLACED

Next: &400, *

APPLIANCE APPEARS SATISFACTORY

Next: nff

OBSERVATION FAN RUNS

ENSURE BOILER IS COOL

Next: &176, f5126

OBSERVATION BURNER IGNITION

Next: &4435, ?228, ?2061, ?2315, ?5208, ?5220

OPERATION CH

Next: &4618, ?304, ?326, ?4058, ?4659, ?5158

OBSERVATION PUMP OVERRUN

Next: &1844, !f3605

WORCESTER GREENSTAR I ERP

Next: &526, !f401

OBSERVATION DISPLAY ILLUMINATES

Next: &5070, ?4104, ?4106

FAULT CODE 224 E9

OUTSIDE MODEL

Next: &nff, p885

FAULT CODE 231 FD

OUTSIDE MODEL

Next: &nff, f931

FAULT CODE 233 9U

OUTSIDE MODEL

Next: &nff, f942

FAULT CODE 264 C1

Next: &nff, f1008

FAULT CODE 239 242-256 258 259 262 263 267 272 279 280 328 F0 257 B7 269 EA

Next: &nff, f1015

FAULT CODE 228 F7

OUTSIDE MODEL

Next: &nff, f1019

FAULT CODE H03 H08 H13

OUTSIDE MODEL

Next: &nff, f1034

FAULT CODE 323 A8

OUTSIDE MODEL

Next: &nff, f1161

FAULT CODE 327

Next: &nff, f1042

FAULT CODE 306 FA

Next: &nff, f1046

FAULT CODE 229 EA 374 8C

Next: &nff, f2530

FAULT CODE 278 F0

Next: &nff, f1268

FURTHER INVESTIGATION FUSE PCB DUMMY

Next: &nff, f2388

FURTHER INVESTIGATION MAINS FUSE DUMMY

Next: &nff, f2407

INFORMATION BOILER SETUP PARAMETERS


1. ENTER

Next: &nff, !f1360

FAULT CODE 276 E9 222 350 E2

NOT USED

Next: &nff, f1391

FAULT CODE 237 273 C4 274

Next: &nff, f1424

FAULT CODE 212 341 D4

OUTSIDE MODEL

Next: &nff, f1434

FAULT CODE 373 8C

OUTSIDE MODEL

Next: &nff, f3836

INFORMATION BOILER TEST MODES


1. ENTER

Next: &nff, !f1488

COMBUSTION TEST MAX AND MINIMUM

Next: &nff, ?1846, ?1848

FAULT CODE 234 EA

OUTSIDE MODEL

Next: &nff, f2662

FAULT CODE 238 F0

OUTSIDE MODEL

Next: &nff, f2682

OBSERVATION SPARKING HEARD

DISCONNECT THE IGNIT

Next: &nff, !f2690

FAULT CODE 258 356 EH 328

OUTSIDE MODEL

Next: &nff, f3148

FAULT CODE H12

Next: &nff, f3622

FAULT CODE H09

OUTSIDE MODEL

Next: &nff, f3610

FAULT CODE 223 351 E2

NOT USED

Next: &nff, f3678

FAULT CODE 214 217 C7 215 216 C6

OUTSIDE MODEL

Next: &nff, f3766

FAULT CODE 363

OUTSIDE MODEL

Next: &nff, f3944

TYPE OF DIAGNOSTIC PROCEDURE

Next: &4306, !f4071

OPERATION DHW

Next: &303, ?4283, ?4285, ?4287, ?4289

DHW FLOW RATE

Next: &5102, f4307

PRESSURE FAN MAX RATE

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: &4445, f4436

PRESSURE GAS INLET (MAX OUTPUT)

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: &4580, !f4446

CH DEMAND RECOGNISED

Next: &4282, f4581

OPERATION PREHEAT

ENSURE DHW TEMPERATU

Next: &342, ?4643, ?4645

FAULT CODE H11

NOT USED

Next: &nff, f4729

OBSERVATION BOILER SELF CHECK

ENSURE NO DEMANDS

Next: &5095, ?5073, ?5075

BOILER SETUP

Next: &4070, !f5096

FAULT CODES

Next: &nff, !p5098

BASIC ADJUSTMENT MODE

Next: &nff, !f5100

OBSERVATION PUMP RUNS

Next: &57, f5103

FAULT CODE 1001 A21 1002 A22 1003 A23 1004 A24 1007 A27 1008 A28 1081-1084 3061-3064 3091-3094 A61-A64

INTENTIONALLY BLANK - HEADER FOR FAULT CODE

Next: &nff, f5203

LITE DIAGNOSTIC

DIAGNOSIS RELIES ON

Next: &nff, !f5235

QUICK ACCESS DATA AND INFORMATION

THE TABLE BELOW SHOW

Next: &nff, !f5237

HEADER FOR QADAI SENSOR FLOW RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5242

HEADER FOR QADAI SENSOR DHW RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5244

HEADER FOR QADAI FLOW SENSOR VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5246

HEADER FOR QADAI GAS VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5248

HEADER FOR QADAI GAS VALVE RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5250

HEADER FOR QADAI SPARK GENERATOR RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5252

HEADER FOR QADAI SPARK GENERATOR VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5254

HEADER FOR QADAI PUMP RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5256

HEADER FOR QADAI PUMP VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5258

HEADER FOR QADAI FAN RESISTANCE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5260

HEADER FOR QADAI FAN VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5262

HEADER FOR QADAI DIVERTER VALVE VOLTAGE

INTENTIONALLY BLANK - HEADER FOR QADAI

Next: &nff, f5264

FAULT CODE 264 C1

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 239 242-256 258 259 262 263 267 272 328 F0 257 B7

PCB WITH BACK PANEL

Next: End

FAULT CODE H13

PCB WITH BACK PANEL

Next: End

FAULT CODE 306 FA

FLUE

Next: End

FAULT 306 FA

SYPHON - XI - LOW

Next: End

FAULT CODE 306 FA PASSING

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 306 FA NOT SHUTTING QUICKLY

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 327

RESET SWITCH

Next: End

FAULT CODE 228 F7

HARNESS - LOW VOLTAGE

Next: End

FAULT 228 F7

SYPHON - XI - LOW

Next: End

FAULT CODE 228 F7

PCB WITH BACK PANEL

Next: End

FAULT CODE 323 A8 FW100 NOT FITTED

PCB WITH BACK PANEL

Next: End

FAULT CODE 323 A8 FW100 FITTED

PCB WITH BACK PANEL

Next: End

INFORMATION BOILER SETUP PARAMETERS

Z REDIRECT

Next: End

FAULT CODE 218 332 E5 222 E2 267 E9 WILL NOT RESET

PCB WITH BACK PANEL

Next: End

FAULT CODE 237 273 C4 274

PCB WITH BACK PANEL

Next: End

FAULT CODE 212

SENSOR - CONTROL

Next: End

FAULT CODE 212

PUMP ASSEMBLY

Next: End

FAULT CODE 212

SYSTEM PRESSURE

Next: End

INFORMATION BOILER TEST MODES

Z REDIRECT

Next: End

COMBUSTION TEST

ELECTRODES

Next: End

COMBUSTION TEST

PIPE - SUCTION (AIR INTAKE)

Next: End

COMBUSTION TEST

SYPHON - XI - LOW

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

FLUE

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

BURNER

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

PIPE - SUCTION (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITION BAFFLES

SYPHON - XI - LOW

Next: End

OBSERVATION BURNER IGNITION BAFFLES

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

OBSERVATION BURNER IGNITION BAFFLES

FLUEWAYS

Next: End

COMBUSTION TEST MAX AND MINIMUM

BURNER

Next: End

COMBUSTION TEST MAX AND MINIMUM

HEAT EXCHANGER

Next: End

FURTHER INVESTIGATION FUSE PCB

PUMP ASSEMBLY

Next: End

FURTHER INVESTIGATION FUSE PCB

GAS VALVE 848 - SIGMA

Next: End

FURTHER INVESTIGATION FUSE PCB

FAN

Next: End

FURTHER INVESTIGATION FUSE PCB

SPARK GENERATOR

Next: End

FURTHER INVESTIGATION FUSE

PCB WITH BACK PANEL

Next: End

FURTHER INVESTIGATION MAINS FUSE

PUMP ASSEMBLY

Next: End

FURTHER INVESTIGATION MAINS FUSE

GAS VALVE 848 - SIGMA

Next: End

FURTHER INVESTIGATION MAINS FUSE

FAN

Next: End

FURTHER INVESTIGATION MAINS FUSE

SPARK GENERATOR

Next: End

FURTHER INVESTIGATION MAINS FUSE

PCB WITH BACK PANEL

Next: End

FAULT CODE 229 EA IGNITES OK

FLUE

Next: End

FAULT CODE 229 EA IGNITES OK

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

FAULT CODE 229 EA IGNITES OK

INLET PRESSURE

Next: End

FAULT CODE 229 EA IGNITION OK

ELECTRODES

Next: End

FAULT CODE 229 EA IGNITES OK

PIPE - SUCTION (AIR INTAKE)

Next: End

FAULT CODE 229 EA IGNITES OK

SYPHON - XI - LOW

Next: End

FAULT CODE 234 EA

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 234 EA

Z REDIRECT

Next: End

OBSERVATION SPARKING HEARD

Z REDIRECT

Next: End

FAULT CODE 238 F0 WILL NOT RESET

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION BURNER IGNITION BAFFLES PRESSURE LOW

BURNER

Next: End

FAULT CODE 258 356 EH

Next: End

FAULT CODE 258 356 EH

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION BAFFLES PRESSURE OK

BURNER

Next: End

OBSERVATION PUMP OVERRUN DOES NOT OVERRUN

PCB WITH BACK PANEL

Next: End

FAULT CODE H09 - NO MAINS POWER TO PUMP

PCB WITH BACK PANEL

Next: End

FAULT CODE H09

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE H09 - NO POWER TO PUMP MODULATOR

PCB WITH BACK PANEL

Next: End

FAULT CODE H09

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE H12

PCB WITH BACK PANEL

Next: End

FAULT CODE 224 E9 OPEN CIRCUIT

LIMITER 120DEG C - TEMPERATURE

Next: End

FAULT CODE 224 E9 OPEN CIRCUIT

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

FAULT CODE 224 E9

SYSTEM PRESSURE

Next: End

FAULT CODE 224 E9 NO VOLTAGE TO PUMP

PCB WITH BACK PANEL

Next: End

FAULT CODE 224 E9

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 224 E9 RUNNING SLOW

PUMP ASSEMBLY

Next: End

FAULT CODE 351 E2

PCB WITH BACK PANEL

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9

SYSTEM PRESSURE

Next: End

FAULT CODE 276 E9 350 E2 NO VOLTAGE TO PUMP

PCB WITH BACK PANEL

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9 RUNNING SLOW

PUMP ASSEMBLY

Next: End

FAULT CODE 278 F0

LIMITER 120DEG C - TEMPERATURE

Next: End

FAULT CODE 278 F0

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

OBSERVATION BURNER IGNITION NOT ESTABLISHING NO CURRENT SHORTED

ELECTRODES

Next: End

FAULT CODE 229 EA AIR INLET FAILED

FLUE / BURNER SEALS

Next: End

FAULT CODE 229 EA AIR INLET OK

FLUE / BURNER SEALS

Next: End

COMBUSTION TEST AIR INLET FAILED

FLUE / BURNER SEALS

Next: End

COMBUSTION TEST AIR INLET OK

FLUE / BURNER SEALS

Next: End

FAULT CODE 214 217 C7 215 216 C6 264 C1

PCB WITH BACK PANEL

Next: End

FAULT CODE 214 217 C7 215 216 C6 264 C1

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION RECTIFICATION LEAD

HARNESS - LOW VOLTAGE

Next: End

OBSERVATION BURNER IGNITION NOT ESTABLISHING NO CURRENT

ELECTRODES

Next: End

OBSERVATION BURNER IGNITION BAFFLES

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION BAFFLES

PIPE - SUCTION (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITION BAFFLES PRESSURE OK

FLUE

Next: End

OBSERVATION BURNER IGNITION PRESSURE NOT OK

FLUE

Next: End

FAULT CODE 373 8C

SYSTEM PRESSURE

Next: End

FAULT CODE 373 8C NO POWER TO PUMP

PCB WITH BACK PANEL

Next: End

FAULT CODE 373 8C

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 373 8C

PUMP ASSEMBLY

Next: End

FAULT CODE 373 8C

SENSOR - CONTROL

Next: End

FAULT CODE 373 8C

Next: End

FAULT CODE 373 8C

VALVE - BY-PASS

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP

BOILER SETUP PARAMETERS

Next: End

FAULT CODE 363

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 363

PCB WITH BACK PANEL

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

FLUE

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

BURNER

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

PIPE - SUCTION (AIR INTAKE)

Next: End

FAULT CODE 229 EA NOT ESTABLISHING NO CURRENT SHORTED

ELECTRODES

Next: End

FAULT CODE 229 EA RECTIFICATION LEAD

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 229 EA NOT ESTABLISHING NO CURRENT

ELECTRODES

Next: End

FAULT CODE 229 EA DOES NOT IGNITE

SYPHON - XI - LOW

Next: End

FAULT CODE 229 EA NO IGNITION

FLUE

Next: End

FAULT CODE 229 EA DOES NOT IGNITE

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

FAULT CODE 229 EA NO IGNITION

BURNER

Next: End

FAULT CODE 229 EA DOES NOT IGNITE

FLUEWAYS

Next: End

FAULT CODE 229 EA

PCB WITH BACK PANEL AND GAS VALVE

Next: End

FAULT CODE 229 EA TO GAS VALVE SPARK NO IGNITION

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 229 EA NO IGNITION

PIPE - SUCTION (AIR INTAKE)

Next: End

INFORMATION CASE REMOVAL

Z REDIRECT

Next: End

FAULT CODE 229 EA NO IGNITION

SPARK GENERATOR

Next: End

FAULT CODE 229 EA IGNITION LEAD

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 229 EA SPARK BUT NO IGNITION

ELECTRODES

Next: End

FAULT CODE 229 EA BAFFLES

SYPHON - XI - LOW

Next: End

FAULT CODE 229 EA PRESSURE NOT OK

FLUE

Next: End

FAULT CODE 229 EA BAFFLES

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

FAULT CODE 229 EA BAFFLES PRESSURE LOW

BURNER

Next: End

FAULT CODE 229 EA BAFFLES

FLUEWAYS

Next: End

FAULT CODE 229 EA BAFFLES

PIPE - SUCTION (AIR INTAKE)

Next: End

FAULT CODE 229 EA BAFFLES

INLET PRESSURE

Next: End

FAULT CODE 229 EA BAFFLES PRESSURE OK

FLUE

Next: End

FAULT CODE 229 EA BAFFLES PRESSURE OK

BURNER

Next: End

OPERATION CH

EXPANSION VESSEL

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP - FAULT

LIMITER 120DEG C - TEMPERATURE

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP - FAULT

SENSOR - CONTROL

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP

SENSOR - CONTROL

Next: End

TYPE OF DIAGNOSTIC PROCEDURE

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE (FUSED SPUR)

Next: End

OBSERVATION DISPLAY ILLUMINATES

FUSE (PCB)

Next: End

OBSERVATION DISPLAY ILLUMINATES ALL OFF

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES FAULTY DISPLAY

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES PUMP RUNS AFTER SELF CHECK

FROST PROTECTION

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION FROST THERMOSTAT

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK

FROST PROTECTION

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION

SENSOR - CONTROL

Next: End

OBSERVATION BOILER SELF CHECK NO DISPLAY

WATER INGRESS

Next: End

OBSERVATION DISPLAY ILLUMINATES - SELF CHECK

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK INCORRECT POWER FAN PULSING

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FAN PULSES

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK

CODE PLUG

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK NO POWER TO FAN

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FAN DOES NOT RUN

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK NO VOLTAGE TO PUMP

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION DISPLAY ILLUMINATES

RESET SWITCH

Next: End

OBSERVATION DISPLAY ILLUMINATES PUMP RUNS CONTINUALLY FLOW SENSOR

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 351 E2

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 278 F0 FLOW SENSOR

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 218 332 E5 222 E2 267 E9

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 306 FA

ELECTRODES

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

SYPHON - XI - LOW

Next: End

FAULT CODE 238 F0

WATER INGRESS

Next: End

FAULT CODE 238 F0 FAULT DURING IGNIION

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

SYPHON - XI - LOW

Next: End

FAULT CODE 229 EA IGNITION OK COMBUSTION OK

ELECTRODES

Next: End

DHW COOL RADS COOL

SYSTEM PRESSURE

Next: End

DHW COOL RADS COOL

SENSOR TEMPERATURE DHW

Next: End

DHW COOL RADS COOL

SENSOR - CONTROL

Next: End

DHW COOL RADS COOL

PUMP ASSEMBLY

Next: End

DHW FLOW RATE

VALVE - DCW IN - ORKLI

Next: End

DHW FLOW RATE

COLD WATER SUPPLY

Next: End

NO FAN NO DISPLAY

PCB WITH BACK PANEL

Next: End

NO FAN NO DISPLAY

HARNESS - LOW VOLTAGE

Next: End

NO FAN NO DISPLAY

SENSOR TEMPERATURE DHW

Next: End

NO FAN NO DISPLAY

SENSOR - CONTROL

Next: End

NO FAN NO DISPLAY

LIMITER 120DEG C - TEMPERATURE

Next: End

NO FAN NO DISPLAY

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER

Next: End

DHW TOO HOT

SENSOR TEMPERATURE DHW

Next: End

OPERATION CH INSUFFICENT HEAT

FLUE

Next: End

OPERATION CH REMAINS LIT

SYPHON - XI - LOW

Next: End

OPERATION CH INSUFFICIENT HEAT

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

OPERATION CH INSUFFICIENT HEAT

BURNER

Next: End

INLET PRESSURE AT MAX

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION DOES NOT IGNITE

SYPHON - XI - LOW

Next: End

OBSERVATION BURNER IGNITION NO IGNITION

FLUE

Next: End

OBSERVATION BURNER IGNITION DOES NOT IGNITE

SEAL AGM - ELBOW (BEARING PLATE)

Next: End

OBSERVATION BURNER IGNITION

BURNER

Next: End

OBSERVATION BURNER IGNITION DOES NOT IGNITE

FLUEWAYS

Next: End

OBSERVATION BURNER IGNITION

PCB WITH BACK PANEL AND GAS VALVE

Next: End

OBSERVATION BURNER IGNITION TO GAS VALVE SPARK NO IGNITION

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION NO IGNITION

PIPE - SUCTION (AIR INTAKE)

Next: End

OBSERVATION BURNER IGNITION NO POWER TO SPARK GEN

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION HARNESS TO SPARK GENERATOR NO SPARKING

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION IGNITION LEAD

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION SPARK BUT NO IGNITION

ELECTRODES

Next: End

SPARKING HEARD BUT NO IGNITION

BURNER

Next: End

DHW HOT THEN COOL

SYSTEM PRESSURE

Next: End

DHW HOT THEN COOL

SENSOR TEMPERATURE DHW

Next: End

DHW HOT THEN COOL

SENSOR - CONTROL

Next: End

DHW HOT THEN COOL

PUMP ASSEMBLY

Next: End

DHW HOT THEN COOL

HEAT EXCHANGER

Next: End

OBSERVATION CH DEMAND 4

PCB WITH BACK PANEL

Next: End

OBSERVATION CH DEMAND 2

PCB WITH BACK PANEL

Next: End

OBSERVATION CH DEMAND 3

PCB WITH BACK PANEL

Next: End

PREHEAT 2

PCB WITH BACK PANEL

Next: End

PREHEAT 3

PCB WITH BACK PANEL

Next: End

OPERATION CH BOILER REACHES TEMP RADS DO NOT HEAT

VALVE - CH

Next: End

CH RADS DO NOT HEAT

DIVERTER VALVE ASSEMBLY

Next: End

CH RADS DO NOT HEAT

SENSOR - CONTROL

Next: End

CH RADS DO NOT HEAT

PUMP ASSEMBLY

Next: End

CH RADS DO NOT HEAT

Next: End

FAULT CODE H11

SENSOR TEMPERATURE DHW

Next: End

FAULT CODE H11

PCB WITH BACK PANEL

Next: End

NO DISPLAY

FLOW SENSOR ASSEMBLY

Next: End

DHW COOL RADS HEAT

PCB WITH BACK PANEL

Next: End

DHW COOL RADS HEAT

HARNESS - LOW VOLTAGE

Next: End

CH RADS DO NOT HEAT

PCB WITH BACK PANEL

Next: End

CH RADS DO NOT HEAT

HARNESS - LOW VOLTAGE

Next: End

RADS DO NOT HEAT

VALVE-BYPASS / PIPE RESTRICTOR

Next: End

FAULT CODE 212 341 D4

HEAT EXCHANGER - 16 PLATE

Next: End

FAULT CODE 224 E9

Next: End

FAULT CODE 224 E9 2

HEAT EXCHANGER

Next: End

FAULT CODE 224 E9

VALVE-BYPASS / PIPE RESTRICTOR

Next: End

FAULT CODE 210 224 E9

SENSOR - CONTROL

Next: End

FAULT CODE E9

SENSOR TEMPERATURE DHW

Next: End

FAULT CODE 224 E9 TRIPPING EARLY

LIMITER 120DEG C - TEMPERATURE

Next: End

FAULT CODE 244 E9

FLUE / BURNER SEALS

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9

Next: End

FAULT CODE 276 E9 350 E2 NOT SHUTTING DOWN AT TEMP

PCB WITH BACK PANEL

Next: End

FAULT CODE E9 276 222 350 E2 2

HEAT EXCHANGER

Next: End

FAULT CODE 276 E9 222 350 E2

VALVE-BYPASS / PIPE RESTRICTOR

Next: End

FAULT CODE 278 FO

SENSOR TEMPERATURE DHW

Next: End

FAULT CODE 373 8C 2

HEAT EXCHANGER

Next: End

FAULT CODE 373 8C

VALVE-BYPASS / PIPE RESTRICTOR

Next: End

OBSERVATION BOILER SELF CHECK PUMP RUNS AFTER SELF CHECK

FROST PROTECTION

Next: End

OBSERVATION BOILER SELF CHECK PUMP RUNS CONTINUALLY

HARNESS - LOW VOLTAGE

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION FROST THERMOSTAT

Next: End

OBSERVATION BOILER SELF CHECK BOILER SELF CHECK

FROST PROTECTION

Next: End

BOILER SETUP

Z REDIRECT

Next: End

BASIC ADJUSTMENT MODE

Z REDIRECT

Next: End

NO FAN DHW DEMAND

PCB WITH BACK PANEL

Next: End

NO FAN DHW DEMAND

HARNESS - LOW VOLTAGE

Next: End

OBSERVATION BOILER SELF CHECK NO VOLTAGE TO PUMP

PCB WITH BACK PANEL

Next: End

OBSERVATION BOILER SELF CHECK

HARNESS - HIGH VOLTAGE

Next: End

NO FAN DHW DEMAND

SENSOR TEMPERATURE DHW

Next: End

OBSERVATION FAN RUNS

SENSOR - CONTROL

Next: End

OBSERVATION FAN RUNS NOT FIRING FOR DHW

LIMITER 120DEG C - TEMPERATURE

Next: End

OBSERVATION FAN RUNS

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

BOILER OUTPUT DHW

Z REDIRECT

Next: End

BOILER OUTPUT CH

Z REDIRECT

Next: End

BOILER FIRES NO DEMAND

FLOW SENSOR ASSEMBLY

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION

SENSOR - CONTROL

Next: End

SELF CHECK

PLUMBING ISSUE- BOILER FIRES NO DEMAND

Next: End

FAULT CODE 238 F0 FAULT DURING IGNITION

PCB WITH BACK PANEL

Next: End

DHW TOO HOT

SENSOR - CONTROL

Next: End

DHW COOL RADS COOL

PLUMBING ISSUE

Next: End

FAULT CODE 1001 - 1008 - BATTERIES ETC

COMFORT CONTROLS

Next: End

FAULT CODE 1001 - 1008

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION - FLICKERING - IGNITION LEAD

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION - FLICKERING

SPARK GENERATOR

Next: End

OBSERVATION BURNER IGNITION NO SPARKING

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION BURNER IGNITION HARNESS TO SPARK GENERATOR NO SPARKING NO SPARKING

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION IGNITION LEAD NO SPARKING

HARNESS - HIGH VOLTAGE

Next: End

BLANK FOR LITE DIAGNOSTIC

Z REDIRECT

Next: End

BLANK QADAI

Z REDIRECT

Next: End

FAN RUNS SLOW NO SPARKING SENSOR OUT OF RANGE

SENSOR TEMPERATURE DHW

Next: End

QADAI

SENSOR TEMPERATURE DHW

Next: End

QADAI

SENSOR - CONTROL

Next: End

NO VOLTAGE TO GAS VALVE QADAI

PCB WITH BACK PANEL

Next: End

QADAI

GAS VALVE 848 - SIGMA

Next: End

QADAI

SPARK GENERATOR

Next: End

QADAI SPARK GENERATOR VOLTAGE ABSENT

PCB WITH BACK PANEL

Next: End

QADAI

PUMP ASSEMBLY

Next: End

QADAI PUMP VOLTAGE ABSENT AT PCB

PCB WITH BACK PANEL

Next: End

QADAI

FAN

Next: End

QADAI FAN VOLTAGE ABSENT AT PCB

PCB WITH BACK PANEL

Next: End

QADAI DIVERTER VALVE VOLTAGE

PCB WITH BACK PANEL

Next: End

QADAI

FLOW SENSOR ASSEMBLY

Next: End

FAULT CODE 233 9U

CODE PLUG

Next: End

FAULT CODE 231 FD

PCB WITH BACK PANEL

Next: End

FAULT CODE 264 C1

FAN

Next: End

FAULT CODE 239 242-256 258 259 262 263 267 272 328 F0 257 B7

Z REDIRECT

Next: End

FAULT CODE 228 F7

Z REDIRECT

Next: End

FAULT CODE H13

Z REDIRECT

Next: End

FAULT CODE 327

PCB WITH BACK PANEL

Next: End

FAULT 228 F7

ELECTRODES

Next: End

FAULT CODE 323 A8

Next: End

FAULT CODE 278 F0

Z REDIRECT

Next: End

FAULT CODE 237 273 C4 274

Z REDIRECT

Next: End

COMBUSTION TEST DROPS ON MINIMUM

GAS VALVE 848 - SIGMA

Next: End

COMBUSTION TEST

NOZZLE (INJECTOR)

Next: End

COMBUSTION TEST

HOSE - GAS

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

FLUEWAYS

Next: End

OBSERVATION BURNER IGNITION BAFFLES

FAN

Next: End

OBSERVATION BURNER IGNITION BURNER BAFFLES

NOZZLE (INJECTOR)

Next: End

OBSERVATION BURNER IGNITION BURNER BAFFLES

HOSE - GAS

Next: End

COMBUSTION TEST FAILS COMBUSTION

GAS VALVE 848 - SIGMA

Next: End

FURTHER INVESTIGATION FUSE PCB PUMP

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE PCB GAS VALVE

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION FUSE PCB FAN

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION

FUSE (PCB) FURTHER INVESTIGATION

Next: End

FURTHER INVESTIGATION FUSE PCB SPARK GENERATOR

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION MAINS FUSE PUMP

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION MAINS FUSE GAS VALVE

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION MAINS FUSE FAN

HARNESS - HIGH VOLTAGE

Next: End

FURTHER INVESTIGATION

FUSE (FUSED SPUR) FURTHER INVESTIGATION

Next: End

FURTHER INVESTIGATION MAINS FUSE SPARK GENERATOR

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 299 EA IGNITES OK

FLUEWAYS

Next: End

FAULT CODE 229 EA IGNITES OK DROPS ON MINIMUM

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 229 EA IGNITES OK FAILS COMBUSTION

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 229 EA IGNITES OK

NOZZLE (INJECTOR)

Next: End

FAULT CODE 229 EA IGNITES OK

HOSE - GAS

Next: End

FAULT CODE 234 EA

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 234 EA

PCB WITH BACK PANEL

Next: End

FAULT CODE 238 F0 WILL NOT RESET

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 258 356 EH

Z REDIRECT

Next: End

COMBUSTION TEST MAXIMUM AND MINIMUM

FLUE

Next: End

FAULT CODE 229 EA COMBUSTION TEST FAILED

FLUE

Next: End

OBSERVATION BURNER IGNITION BAFFLES

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE H09 - NOT RUNNING

PUMP ASSEMBLY

Next: End

FAULT CODE H09 - NOT COMMUNICATING

PUMP ASSEMBLY

Next: End

FAULT CODE H12

Next: End

FAULT CODE 224 E9 STUCK IN FAULT

PCB WITH BACK PANEL

Next: End

FAULT CODE 224 E9

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 224 E9 NOT RUNNING

PUMP ASSEMBLY

Next: End

FAULT CODE 351 E2

Z REDIRECT

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9 NOT RUNNING

PUMP ASSEMBLY

Next: End

FAULT CODE 278 F0

PCB WITH BACK PANEL

Next: End

FAULT CODE 278 F0

HARNESS - LOW VOLTAGE

Next: End

OBSERVATION BURNER IGNITION NO VOLTAGE TO RECTIFICATION CIRCUIT

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION RECTIFICATION SHORTING

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 214 217 C7 215 216 C6 264 C1

FAN

Next: End

OBSERVATION BURNER IGNITION DOES NOT ESTABLISH

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION BURNER IGNITION NOT ESTABLISHING LOW VOLTAGE

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION BAFFLES PRESSURE NOT OK

NOZZLE (INJECTOR)

Next: End

OBSERVATION BURNER IGNITION BAFFLES PRESSURE NOT OK

HOSE - GAS

Next: End

FAULT CODE 373 8C EF STUCK

PUMP ASSEMBLY

Next: End

FAULT CODE 373 8C

Next: End

FAULT CODE 373 8C

PCB WITH BACK PANEL

Next: End

FAULT CODE 363

Z REDIRECT

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

FLUEWAYS

Next: End

FAULT CODE 229 EA NO VOLTAGE TO RECTIFICATION CIRCUIT

PCB WITH BACK PANEL

Next: End

FAULT CODE 229 EA RECTIFICATION SHORTING

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 229 EA NOT ESTABLISHING LOW VOLTAGE

PCB WITH BACK PANEL

Next: End

FAULT CODE 229 EA DOES NOT ESTABLISH

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 229 EA NO IGNITION

FAN

Next: End

FAULT CODE 229 EA NO IGNITION

INLET PRESSURE

Next: End

FAULT CODE 229 EA NO IGNITION NO DROP

NOZZLE (INJECTOR)

Next: End

FAULT CODE 229 EA NO IGNITION NO DROP

HOSE - GAS

Next: End

FAULT CODE 229 EA NO POWER TO GAS VALVE

PCB WITH BACK PANEL

Next: End

FAULT CODE 229 EA

PCB WITH BACK PANEL AND HARNESS HIGH VOLTAGE

Next: End

FAULT CODE 229 EA NO PRESSURE DROP

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 229 EA SPARKING NO IGNITION

NOZZLE (INJECTOR)

Next: End

FAULT CODE 229 EA NO IGNITION PRESSURE DROP

HOSE - GAS

Next: End

FAULT CODE 229 EA PRESSURE DROP SEEN

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 229 EA BAFFLES PRESSURE NOT OK

NOZZLE (INJECTOR)

Next: End

FAULT CODE 229 EA BAFFLES PRESSURE NOT OK

HOSE - GAS

Next: End

FAULT CODE 229 EA IGNITION BAFFLES

FAN

Next: End

FAULT CODE 229 EA BURNER BAFFLES

NOZZLE (INJECTOR)

Next: End

FAULT CODE 229 EA BURNER BAFFLES

HOSE - GAS

Next: End

FAULT CODE 229 EA BAFFLES

GAS VALVE 848 - SIGMA

Next: End

OPERATION CH

PIPE - EXPANSION VESSEL

Next: End

FAULT CODE 238 F0 RESETS BUT FAULT REOCCURS

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 238 F0 FAULTS DURING OP

WATER INGRESS

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP - FAULT

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP - FAULT

PCB WITH BACK PANEL

Next: End

OPERATION CH SHUTS DOWN BEFORE TEMP

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES

Next: End

OBSERVATION DISPLAY ILLUMINATES MAINS FUSE

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES INTERNAL FUSE

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION PUMP RUNS

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK STUCK IN FAULT

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES SELF CHECK FAN RUNS CONSTANT SPEED

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FAN PULSES

FAN

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FAN DOES NOT RUN

FAN

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK

PUMP ASSEMBLY

Next: End

OBSERVATION DISPLAY ILLUMINATES JUMBLED

PCB WITH BACK PANEL

Next: End

OBSERVATION DISPLAY ILLUMINATES BOILER SELF CHECK FROST PROTECTION PUMP ONLY

SENSOR - CONTROL

Next: End

FAULT CODE 351 E2

SENSOR - CONTROL

Next: End

FAULT CODE 278 F0

SENSOR - CONTROL

Next: End

FAULT CODE 218 332 E5 222 E2 267 E9

SENSOR - CONTROL

Next: End

FAULT CODE 306 FA

PCB WITH BACK PANEL

Next: End

FAULT CODE 238 F0 FAULT DURING IGNITION

HARNESS - HIGH VOLTAGE

Next: End

FAULT CODE 229 EA

NO FAULT FOUND

Next: End

DHW FLOW RATE

HEAT EXCHANGER - 16 PLATE

Next: End

DHW FLOW RATE

FILTER - INSERT - DHW

Next: End

DHW FLOW RATE

FLOW SENSOR ASSEMBLY

Next: End

DHW FLOW RATE

ADAPTOR - FLOW SENSOR

Next: End

DHW FLOW RATE

REGULATOR

Next: End

DHW FLOW RATE

NOZZLE

Next: End

NO DISPLAY

PCB WITH BACK PANEL (NO DISPLAY)

Next: End

NO FAN NO DISPLAY 3

FLOW SENSOR ASSEMBLY

Next: End

NO FAN NO DISPLAY

FILTER - INSERT - DHW

Next: End

NO FAN NO DISPLAY 2

FLOW SENSOR ASSEMBLY

Next: End

NO FAN NO DISPLAY

ADAPTOR - FLOW SENSOR

Next: End

NO FAN NO DISPLAY

REGULATOR

Next: End

NO FAN NO DISPLAY

NOZZLE

Next: End

NO FAN NO DISPLAY 2

PCB WITH BACK PANEL

Next: End

NO FAN NO DISPLAY 2

HARNESS - LOW VOLTAGE

Next: End

DHW COOL RADS COOL

HEAT EXCHANGER - 16 PLATE

Next: End

OPERATION CH INSUFFICIENT HEAT

FLUEWAYS

Next: End

OBSERVATION BURNER IGNITION NO IGNITION

FAN

Next: End

OBSERVATION BURNER IGNITION NO IGNITION

INLET PRESSURE

Next: End

OBSERVATION BURNER IGNITION NO IGNITION NO DROP

NOZZLE (INJECTOR)

Next: End

OBSERVATION BURNER IGNITION NO IGNITION NO DROP

HOSE - GAS

Next: End

OBSERVATION BURNER IGNITION NO POWER TO GAS VALVE

PCB WITH BACK PANEL

Next: End

OBSERVATION BURNER IGNITION

PCB WITH BACK PANEL AND HARNESS HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION NO PRESSURE DROP

GAS VALVE 848 - SIGMA

Next: End

OBSERVATION BURNER IGNITION SPARKING NO IGNITION

NOZZLE (INJECTOR)

Next: End

OBSERVATION BURNER IGNITION NO IGNITION PRESSURE DROP

HOSE - GAS

Next: End

OBSERVATION BURNER IGNITION NO SPARKING

SPARK GENERATOR

Next: End

OBSERVATION BURNER IGNITION PRESSURE DROP SEEN

GAS VALVE 848 - SIGMA

Next: End

DHW COOL RADS HEAT

DIVERTER VALVE ASSEMBLY

Next: End

DHW HOT THEN COOL

HEAT EXCHANGER - 16 PLATE

Next: End

DHW HOT THEN COOL

PCB WITH BACK PANEL

Next: End

OBSERVATION CH DEMAND

PCB WITH BACK PANEL

Next: End

OBSERVATION CH DEMAND

Next: End

OBSERVATION CH DEMAND 2

Next: End

CH DEMAND

INTERNAL PROGRAMMER

Next: End

PREHEAT OPERATION

PCB WITH BACK PANEL

Next: End

PREHEAT

PCB WITH BACK PANEL

Next: End

PREHEAT

Next: End

PREHEAT

INTERNAL PROGRAMMER

Next: End

OPERATION CH UP TO TEMP RADS COOL

Next: End

FAULT CODE H11

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE H11

Z REDIRECT

Next: End

OBSERVATION DISPLAY ILLUMINATES BLANK DISPLAY

HARNESS - LOW VOLTAGE

Next: End

DHW COOL RADS HEAT 2

MOTOR - DIVERTER VALVE

Next: End

CH RADS DO NOT HEAT 2

MOTOR - DIVERTER VALVE

Next: End

FAULT CODE 212 341 D4

HEAT EXCHANGER

Next: End

FAULT CODE 212 341 D4

VALVE - BY-PASS (INSPECTION)

Next: End

FAULT CODE 212 341 D4

PIPE - RESTRICTOR - BYPASS

Next: End

FAULT CODE 212 341 D4

PCB WITH BACK PANEL

Next: End

FAULT CODE E9

HEAT EXCHANGER - 16 PLATE

Next: End

FAULT CODE 224 E9

Next: End

FAULT CODE 224 E9 NOT SHUTTING DOWN AT TEMP

PCB WITH BACK PANEL

Next: End

FAULT CODE 224 E9

FLUEWAYS

Next: End

FAULT 224 E9

TEMPERATURE LIMITER ASSEMBLY - PUSH FIT

Next: End

FAULT CODE 224 E9

OVERHEAT

Next: End

FAULT CODE 276 E9 350 E2

OVERHEAT

Next: End

FAULT CODE E9 276 222 350 E2

HEAT EXCHANGER - 16 PLATE

Next: End

FAULT CODE 276 E9 350 E2FAULT CODE 224 E9

Next: End

FAULT CODE 278 FO

HARNESS - LOW VOLTAGE

Next: End

FAULT CODE 373 8C

HEAT EXCHANGER - 16 PLATE

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION PUMP ONLY

SENSOR - CONTROL

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION PUMP RUNS

PCB WITH BACK PANEL

Next: End

FAULT CODE 2

Z REDIRECT

Next: End

NO FAN DHW DEMAND

FLOW SENSOR ASSEMBLY

Next: End

NO FAN DHW DEMAND

FILTER - INSERT - DHW

Next: End

NO FAN DHW DEMAND 2

FLOW SENSOR ASSEMBLY

Next: End

NO FAN DHW DEMAND

ADAPTOR - FLOW SENSOR

Next: End

NO FAN DHW DEMAND

REGULATOR

Next: End

NO FAN DHW DEMAND

NOZZLE

Next: End

OBSERVATION BOILER SELF CHECK

PUMP ASSEMBLY

Next: End

OBSERVATION FAN RUNS NO RESPONSE TO DHW

PCB WITH BACK PANEL

Next: End

OBSERVATION FAN RUNS FLUE SENSOR

HARNESS - LOW VOLTAGE

Next: End

CH RADS DO NOT REACH TEMP

PCB WITH BACK PANEL

Next: End

BOILER FIRES NO DEMAND

PCB WITH BACK PANEL

Next: End

OBSERVATION BOILER SELF CHECK FROST PROTECTION

PCB WITH BACK PANEL

Next: End

FAULT CODE 238 F0

GAS VALVE 848 - SIGMA

Next: End

FAULT CODE 238 F0

PCB WITH BACK PANEL

Next: End

DHW TOO HOT

PCB WITH BACK PANEL

Next: End

DHW COOL RADS COOL

PCB WITH BACK PANEL

Next: End

OPERATION CH INSUFFICIENT HEAT

NOZZLE (INJECTOR)

Next: End

OPERATION CH INSUFFICIENT HEAT

HOSE - GAS

Next: End

FAULT CODE 1001 - 1008 STUCK FAULTY

COMFORT CONTROLS

Next: End

OBSERVATION BURNER IGNITION - FLICKERING

ELECTRODES

Next: End

OBSERVATION BURNER IGNITION TO GAS VALVE NO SPARKING

HARNESS - HIGH VOLTAGE

Next: End

OBSERVATION BURNER IGNITION NO SPARKING NO SPARKING

SPARK GENERATOR

Next: End

OBSERVATION BURNER IGNITION NO SPARKING

ELECTRODES

Next: End

OBSERVATION BURNER IGNITION NO POWER TO SPARK GEN NO SPARKING

PCB WITH BACK PANEL

Next: End

SENSOR DHW

RESULT AS EXPECTED

Next: End

SENSOR CONTROL

RESULT AS EXPECTED

Next: End

FLOW SENSOR

RESULT AS EXPECTED

Next: End

GAS VALVE

RESULT AS EXPECTED

Next: End

GAS VALVE RESISTANCE

RESULT AS EXPECTED

Next: End

SPARK GENERATOR

RESULT AS EXPECTED

Next: End

SPARK GENERATOR VOLTAGE

RESULT AS EXPECTED

Next: End

PUMP

RESULT AS EXPECTED

Next: End

PUMP VOLTAGE OK

RESULT AS EXPECTED

Next: End

FAN

RESULT AS EXPECTED

Next: End

FAN VOLTAGE OK

RESULT AS EXPECTED

Next: End

DIVERTER VALVE

RESULT AS EXPECTED

Next: End

FAULT CODE 231 FD

Z REDIRECT

Next: End

FAULT CODE 233 9U

PCB WITH BACK PANEL

Next: End

COMBUSTION TEST FAILED

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p2370

BOILER DROPS OUT ON MINIMUM RATE

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p1849

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p1858

GAS SUPPLY TUBE BLOCKED RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p1860

BURNER DOES NOT IGNITE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p4528

BURNER IGNITES BUT DOES NOT ESTABLISH (FLAME SYMBOL DOES NOT DISPLAY) - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p4217

BURNER IGNITES BUT BAFFLES OR IS NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p2316

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p2332

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p2334

BURNER DOES NOT IGNITE OR IGNITES INTERMITTENTLY

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION FAULT CODE 229

Next: p3972

BURNER DOES NOT ESTABLISH OR ESTABLISHES INTERMITTENTLY - RECTIFICATION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION FAULT CODE 229

Next: p4242

BURNER IGNITES BUT BAFFLES OR IS NOISY - COMBUSTION ISSUE

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p4018

COMBUSTION TEST FAILED

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p2782

BOILER DROPS OUT ON MINIMUM RATE

CHARACTERISTIC TEST FROM COMBUSTION TEST MAX AND MINIMUM

Next: p2644

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p2654

GAS SUPPLY TUBE BLOCKED RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p2656

EXCESSIVE SYSTEM PRESSURE RISE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3756

BOILER SHUTS DOWNS BEFORE REACHING TEMPERATURE - NO FAULT CODE

CHARACTERISTIC TEST FROM OPERATION CH

Next: p3900

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p3833

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p3835

NO PRESSURE DROP OBSERVED

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p3988

PRESSURE DROPS BELOW 16.5MB

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p3990

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p3993

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p3995

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4009

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4011

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4028

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4030

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4046

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4048

HARNESS DAMAGED / POOR CONDITION

CHARACTERISTIC TEST FROM INSPECTION HARNESS GAS VALVE

Next: !p4055

WATER INGRESS PRESENT

CHARACTERISTIC TEST FROM INSPECTION HARNESS GAS VALVE

Next: !p4057

BOILER SHUTS DOWN BEFORE REACHING TEMPERATURE - FAULT CODE PRESENT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4060

DISPLAY DOES NOT ILLUMINATE

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p4108

DISPLAY ILLUMINATES BUT DOES NOT SHOW INFORMATION OR IS JUMBLED

CHARACTERISTIC TEST FROM OBSERVATION DISPLAY ILLUMINATES

Next: p4191

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4128

FAN DOES NOT RUN

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4130

FAN PULSES 3 TIMES AT INCREASING SPEEDS THEN RUNS FOR 2 MINUTES

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4132

FAN RUNS AT A CONSTANT SPEED FOR 1 MINUTE

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4134

BOILER ATTEMPTS TO FIRE AFTER SELF CHECK

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4136

PUMP RUNS CONTINUOUSLY AFTER SELF CHECK

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK NO DISPLAY

Next: p4138

DHW COOL - RADIATORS REMAIN COOL OR DO NOT INCREASE IN TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p4284

DHW COOL - RADIATORS BEGIN TO HEAT OR INCREASE IN TEMPERATURE

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p4286

DHW TOO HOT

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p4288

DHW RUNS HOT THEN COOL

CHARACTERISTIC TEST FROM OPERATION DHW

Next: p4600

1 DHW INLET FILTER RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4314

2 FLOW SENSOR ASSEMBLY RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4316

3 ADAPTOR FLOW SENSOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4318

4 FLOW REGULATOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4320

5 NOZZLES RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4322

1 DHW INLET FILTER RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4408

2 FLOW SENSOR ASSEMBLY RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4410

3 ADAPTOR FLOW SENSOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4412

4 FLOW REGULATOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4414

5 NOZZLES RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p4416

NO PRESSURE DROP OBSERVED

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: p4544

PRESSURE DROPS BELOW 16.5MB

CHARACTERISTIC TEST FROM PRESSURE GAS INLET AND DROP

Next: !p4546

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4549

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4551

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4565

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p4567

ECO REMAINS IN DISPLAY WITH TIMER SYMBOL

CHARACTERISTIC TEST FROM OPERATION PREHEAT

Next: p4644

PREHEAT DISPLAYED BUT DOES NOT OPERATE AS ABOVE

CHARACTERISTIC TEST FROM OPERATION PREHEAT

Next: !p4646

BOILER REACHES TEMPERATURE, RADIATORS DO NOT HEAT

CHARACTERISTIC TEST FROM OPERATION CH

Next: p4660

INTERNAL BYPASS BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION INTERNAL BYPASS

Next: !p4953

RESTRICTOR BLOCKED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION INTERNAL BYPASS

Next: !p4955

BOILER WAS STILL FIRING WITH TEMPERATURE ABOVE 88°C

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER TO TEMPERATURE

Next: !p4976

BOILER SHUTS DOWN WITH OVERHEAT FAULT BEFORE REACHING TEMPERATURE

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER TO TEMPERATURE

Next: p4978

FLUE TEMPERATURE EXCESSIVE

Next: !p4980

BOILER ATTEMPTS TO FIRE AFTER SELF CHECK (ECO DISPLAYED)

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p5074

PUMP RUNS CONTINUOUSLY AFTER SELF CHECK (ECO DISPLAYED)

CHARACTERISTIC TEST FROM OBSERVATION BOILER SELF CHECK

Next: p5076

1 DHW INLET FILTER RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p5112

2 FLOW SENSOR ASSEMBLY RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p5114

3 ADAPTOR FLOW SENSOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p5116

4 FLOW REGULATOR RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p5118

5 NOZZLES RESTRICTED/BLOCKED

CHARACTERISTIC TEST FROM INSPECTION FLOW COMPONENTS

Next: !p5120

BOILER DOES NOT SHUT OFF, BOILER & RADIATORS ONLY GET WARM OR DO NOT REACH TEMP

CHARACTERISTIC TEST FROM OPERATION CH

Next: p5159

INJECTOR BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p5199

GAS SUPPLY TUBE BLOCKED, RESTRICTED OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION GAS SUPPLY TUBE

Next: !p5201

DISPLAY FLICKERS DURING SPARKING

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p5209

NO SPARKING HEARD

CHARACTERISTIC TEST FROM OBSERVATION BURNER IGNITION

Next: p5221

24/11/2022 10:44:09 2210_2_50_1 28/12/2022 09:45:27

30/11/2022 13:04:45

Next: End

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p1010, !f1009

OBSERVATION BOILER RESET INTERNAL ERROR

Next: !p1016, !f1017

OBSERVATION BOILER RESET FAULT 228 F7

Next: !p1020, f1056

INFORMATION SERVICE REMINDER

H13 IS THE CODE TO I

Next: !p1035, !f1036

INSPECTION RESET SWITCH

Next: !p1043, !f1055

INSPECTION FLUE

Next: p1047, !f1048

INSPECTION RECTIFICATION LEAD

{GAINPCBACS}
REMO

Next: p1061, !f1058

OBSERVATION IS WEATHER COMPENSATION FITTED

Next: p1163, !f1162

OBSERVATION BOILER RESET FAULT 278 F0

ENSURE APPLIANCE IS COOL

Next: !p1269, f1270

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p5028, f1274

RESISTANCE HARNESS SENSOR FLOW

{GAINPCBACS}
DISC

Next: !p4202, !f4203

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p1392, f1393

RESISTANCE HARNESS SENSOR FLOW

{GAINPCBACS}
DISC

Next: !p4204, !f4205

OBSERVATION BOILER RESET FAULT 237 273 C4 274

Next: !p1425, !f1426

INSPECTION PRESSURE SYSTEM

Next: p1435, !f1442

INSPECTION FLUE

Next: p2175, !f2176

INSPECTION FLUE

Next: p3824, !f3823

RESISTANCE MAINS IN FURTHER INVESTIGATION

GAIN ACCESS TO THE INSTALLER CONNECTIONS PANEL OF THE PCB
REPLACE DAMAGED FUSE

Next: p2389, !f2406

RESISTANCE PUMP FURTHER INVESTIGATION

DISCONNECT CONNECTOR FROM PUMP

Next: !p2392, !f2393

RESISTANCE GAS VALVE FURTHER INVESTIGATION

DISCONNECT PLUG FROM GAS VALVE

Next: !p2396, !f2397

RESISTANCE FAN FURTHER INVESTIGATION

DISCONNECT CONNECTOR FROM FAN

Next: !p2400, !f2401

RESISTANCE SPARK GENERATOR FURTHER INVESTIGATION

DISCONNECT 2 PIN CONNECTOR FROM SPARK GENERATOR

Next: !p2404, !f2405

RESISTANCE MAINS IN FURTHER INVESTIGATION

GAIN ACCESS TO THE INSTALLER CONNECTIONS PANEL OF THE PCB
REPLACE DAMAGED FUSE

Next: p2408, !f2425

RESISTANCE PUMP FURTHER INVESTIGATION

DISCONNECT CONNECTOR FROM PUMP

Next: !p2411, !f2412

RESISTANCE GAS VALVE FURTHER INVESTIGATION

DISCONNECT PLUG FROM GAS VALVE

Next: !p2415, !f2416

RESISTANCE FAN FURTHER INVESTIGATION

DISCONNECT CONNECTOR FROM FAN

Next: !p2419, !f2420

RESISTANCE SPARK GENERATOR FURTHER INVESTIGATION

DISCONNECT 2 PIN CONNECTOR FROM SPARK GENERATOR

Next: !p2423, !f2424

OBSERVATION BURNER IGNITION FAULT CODE 229

Next: p2531, ?2532, ?2534, ?2536

INSPECTION FLUE

Next: p2633, !f2634

OBSERVATION BOILER RESET FAULT 234

Next: p2667, !f2687

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p2670, !f2671

OBSERVATION BOILER RESET FAULT 238 F0

Next: p2708, f2684

INSPECTION HARNESS GAS VALVE

Next: p4270, ?4054, ?4056

RESISTANCE GAS VALVE TO EARTH

DISCONNECT PLUG FROM GAS VALVE

Next: !p2713, !f2714

VOLTAGE MAINS POWER IN FAULT CODE

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: p3153, !f3145

INSPECTION SEAL INTEGRITY

Next: !p3471, !f3761

INSPECTION SEAL INTEGRITY

Next: !p3479, !f3759

OBSERVATION PUMP RUNS (FAULT CODE)

Next: p3611, f3613

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3614, !f3615

OBSERVATION DISCONNECT STORAGE SENSOR

NOT CURRENTLY USED

Next: !p3623, !f3624

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p3626, f3627

RESISTANCE SENSOR OVERHEAT

DISCONNECT WIRES FROM THE OVERHEAT STAT

Next: p3628, !f3629

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3644, !f3645

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p3679, f3683

RESISTANCE HARNESS SENSOR FLOW

{GAINPCBACS}
DISC

Next: !p4200, !f4201

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3691, !f3692

RESISTANCE SENSOR OVERHEAT

DISCONNECT WIRES FROM THE OVERHEAT STAT

Next: p3742, !f3743

RESISTANCE RECTIFICATION CIRCUIT TO EARTH

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p3747, f3748

RESISTANCE RECTIFICATION ELECTRODE TO EARTH

DISCONNECT LEAD FROM

Next: !p3749, !f3750

VOLTAGE FAN SELF CHECK

{GAINPCBACS}

Next: p3767, !f3768

RESISTANCE RECTIFICATION LEAD

{GAINPCBACS}
DISC

Next: p3782, !f3783

INSPECTION PRESSURE SYSTEM

Next: p3837, !f3838

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p3841, !f3842

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: !p3887, !f5060

INSPECTION EARTH CONNECTIONS

{GAINPCBACS}

Next: p3946, !f3945

INSPECTION FLUE

Next: p3952, !f3953

RESISTANCE RECTIFICATION CIRCUIT TO EARTH

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p3962, f3963

RESISTANCE RECTIFICATION ELECTRODE TO EARTH

DISCONNECT LEAD FROM

Next: !p3964, !f3965

RESISTANCE RECTIFICATION LEAD

{GAINPCBACS}
DISC

Next: p3968, !f3969

INSPECTION CONDENSATE PIPE

Next: p3975, !f3976

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p3998, f3999

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p4000, !f4001

INSPECTION FLUE

Next: p4023, !f4024

RESISTANCE SENSOR OVERHEAT (AT TEMP)

Next: !p4063, !f4064

VOLTAGE MAINS POWER IN

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: p4111, f4112

RESISTANCE FUSE (MAINS FUSE)

REMOVE THE FUSE FROM THE FUSED SPUR

Next: !p4113, f4114

FURTHER INVESTIGATION MAINS FUSE

Next: !p4115, !f4116

FURTHER INVESTIGATION FUSE PCB

Next: !p4119, !f4120

RESISTANCE HARNESS SENSOR FLOW

{GAINPCBACS}
DISC

Next: !p4196, !f4197

RESISTANCE GAS VALVE TO EARTH

DISCONNECT PLUG FROM GAS VALVE

Next: !p4157, !f4158

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p4273, !f4274

INSPECTION SERVICE VALVE DHW INLET

Next: p4308, !f4309

VOLTAGE FLOW SENSOR - DEMAND

{GAINPCBACS}
DHW FLOW RATE GREATER THAN 3 LTR/MIN

Next: p4399, f4400

VOLTAGE FLOW SENSOR - SUPPLY

{GAINPCBACS}

Next: p4401, !f4402

RESISTANCE SENSOR OVERHEAT

DISCONNECT WIRES FROM THE OVERHEAT STAT

Next: p4423, !f4424

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p4429, !f4430

INSPECTION FLUE

Next: p4437, !f4438

INSPECTION CONDENSATE PIPE

Next: p4531, !f4532

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p4554, f4555

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p4556, !f4557

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}

Next: p4570, !f4571

OBSERVATION INTERNAL OR EXTERNAL PROGRAMMER/RECEIVER FITTED

Next: p4626, f4632

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p4611, !f4612

VOLTAGE CH DEMAND OUT OF BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: !p4629, !f4630

VOLTAGE CH DEMAND INTO BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: p4637, f4634

VOLTAGE CH DEMAND OUT OF BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: !p4635, !f4636

VOLTAGE DHW DEMAND OUT OF BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: !p4654, !f4655

DISCONNECT INTERNAL PROGRAMMER/RECEIVER (PREHEAT)

REMOVE & DISCONNECT INTERNAL PROGRAMMER/RECEIVER ASSEMBLY FROM THE BOILER

Next: !p4657, !f4658

RESISTANCE SENSOR DHW AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR LV1 FROM THE PCB

Next: p4730, f4731

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: !p4732, !f4733

VOLTAGE DIVERTER VALVE AT PCB (MOTOR DISCONNECTED)

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR TO DIVERTER VALVE MOTOR
NO DEMAND

Next: p4846, !f4847

VOLTAGE DIVERTER VALVE AT PCB (MOTOR DISCONNECTED)

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR TO DIVERTER VALVE MOTOR
NO DEMAND

Next: p4852, !f4853

INSPECTION INTERNAL BYPASS

BOILER PRIMARY CIRCUIT ISOLATED AND DRAINED

Next: !p4951, ?4952, ?4954

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p4963, !f4964

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: !p4967, !f4968

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: !p5026, !f5027

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p5021, !f5022

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: !p5037, !f5038

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p5055, !f5056

RESISTANCE HARNESS SENSOR FLOW

{GAINPCBACS}
DISC

Next: !p5081, !f5082

VOLTAGE FLOW SENSOR - DEMAND

{GAINPCBACS}
DHW FLOW RATE GREATER THAN 3 LTR/MIN

Next: p5121, f5104

VOLTAGE FLOW SENSOR - SUPPLY

{GAINPCBACS}

Next: p5105, !f5106

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p5127, !f5128

RESISTANCE SENSOR OVERHEAT

DISCONNECT WIRES FROM THE OVERHEAT STAT

Next: p5133, !f5134

OBSERVATION CLOSE SERVICE VALVE DHW INLET

CLOSE DHW SERVICE VA

Next: p5169, !f5177

INFORMATION COMFORT CONTROLS

Next: p5204, !f5205

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p5224, !f5225

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}

Next: p5228, f5238

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: !p5239, !f5240

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p5267, !f5268

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: !p5265, !f5266

VOLTAGE FLOW SENSOR - DEMAND

{GAINPCBACS}
DHW FLOW RATE GREATER THAN 3 LTR/MIN

Next: !p5269, !f5290

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p5271, !f5272

RESISTANCE GAS VALVE

DISCONNECT PLUG FROM GAS VALVE

Next: !p5273, !f5274

RESISTANCE SPARK GENERATOR

DISCONNECT 2 PIN CONNECTOR FROM SPARK GENERATOR

Next: !p5275, !f5276

VOLTAGE SPARK GENERATOR AT PCB

{GAINPCBACS}

Next: !p5277, !f5278

RESISTANCE PUMP

DISCONNECT CONNECTOR FROM PUMP

Next: !p5279, !f5280

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: !p5281, !f5282

RESISTANCE FAN

DISCONNECT CONNECTOR FROM FAN

Next: !p5283, !f5284

VOLTAGE FAN SELF CHECK

{GAINPCBACS}

Next: !p5285, !f5287

VOLTAGE DIVERTER VALVE AT PCB (MOTOR DISCONNECTED)

{GAINPCBACS}
REMOVE ELECTRICAL CONNECTOR TO DIVERTER VALVE MOTOR
NO DEMAND

Next: !p5288, !f5289

OBSERVATION BOILER RESET FAULT 231

Next: !p939, !f985

INSPECTION CODE PLUG

LOWER CONTROL PANEL

Next: !p943, !f944

INSPECTION CONDENSATE PIPE

Next: p1049, !f1050

PRESSURE TIGHTNESS TEST

Next: p1052, !f1051

PRESSURE STANDING RETURN

ATTACH U-GAUGE TO INLET PRESSURE TEST POINT

Next: p4214, !f1053

OBSERVATION DISCONNECT RECTIFICATION LEAD

DISCONNECT THE RECTI

Next: p1063, !f1066

INSPECTION CONDENSATE PIPE

Next: !p1064, !f1065

DISCONNECT FW100 CONTROLS

DISCONNECT FW100 OR

Next: !p1164, !f1165

OBSERVATION BOILER RESET

ENSURE APPLIANCE IS COOL

Next: p3686, !f1397

PUMP LIMPET TEST

Next: p1436, !f1441

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4948, !f1438

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p1852, !f1853

INSPECTION RECTIFICATION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p1850, !f1851

INSPECTION CONDENSATE PIPE

Next: p3453, !f1855

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p2365, ?1857, ?1859

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p2173, f2174

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p2181, !f2182

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p2177, !f2178

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2179, !f2180

VOLTAGE RECTIFICATION CIRCUIT (AC)

{GAINPCBACS}

Next: p3774, f3746

INSPECTION CONDENSATE PIPE

Next: p2317, !f2318

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p3807, f2320

INSPECTION FLUE

Next: p2327, !f3822

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p2770, !f2324

INSPECTION HEAT EXCHANGER FLUE WAYS

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2325, !f2326

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p3531, ?2331, ?2333

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p2367, !f2366

INSPECTION HEAT EXCHANGER FLUE WAYS

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p2368, !f2369

INSPECTION AIR INLET INTEGRITY

REFIT COMBUSTION CHA

Next: p1847, f3470

RESISTANCE PUMP AND HARNESS FURTHER INVESTIGATION

{GAINPCBACS}
DISCONNECT CONNECTOR HV1 FROM THE PCB

Next: p2390, f2391

RESISTANCE GAS VALVE AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p2394, f2395

RESISTANCE FAN AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p2398, f2399

RESISTANCE SPARK GENERATOR AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p2402, f2403

RESISTANCE PUMP AND HARNESS FURTHER INVESTIGATION

{GAINPCBACS}
DISCONNECT CONNECTOR HV1 FROM THE PCB

Next: p2409, f2410

RESISTANCE GAS VALVE AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p2413, f2414

RESISTANCE FAN AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p2417, f2418

RESISTANCE SPARK GENERATOR AND HARNESS FURTHER INVESTIGATION

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p2421, f2422

PRESSURE FAN MAX RATE

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p2631, f2632

PRESSURE GAS INLET

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p2637, !f2638

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: !p2635, !f2636

COMBUSTION TEST MAX AND MINIMUM

Next: p4275, ?2641, ?2643

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p2647, !f2648

INSPECTION RECTIFICATION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p2645, !f2646

INSPECTION CONDENSATE PIPE

Next: p3486, !f2650

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: !p2651, ?2653, ?2655

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p2688, f2669

INSPECTION WATER INGRESS GAS VALVE AND PCB

Next: p2709, !f4267

RESISTANCE GAS VALVE AND HARNESS TO EARTH

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p5186, f2712

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p2323, !f2774

INSPECTION AIR INLET INTEGRITY

REFIT COMBUSTION CHA

Next: p2642, f3478

OBSERVATION BOILER RESET FAULT 258 356

Next: !p3156, !f3157

INSPECTION SEAL INTEGRITY

Next: p1854, !f3762

INSPECTION SEAL INTEGRITY

Next: p2649, !f3760

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3532, !f3533

VOLTAGE PUMP MODULATION AT PCB

{GAINPCBACS}
REMOVE WHITE RETAINING CLIP, REMOVE MODULATING
PLUG FROM THE PUMP AND MAKE SAFE

Next: p3619, !f3618

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p3616, !f3617

RESISTANCE HARNESS PUMP MODULATION

REMOVE WHITE RETAINING CLIP AND REMOVE
MODULATING PLUG FROM THE PUMP

Next: !p3620, !f3621

RESISTANCE SENSOR FLUE

REMOVE AIR INTAKE FROM APPLIANCE
DISCONNECT WIRES FROM FLUE SENSOR

Next: !p3630, !f3631

INSPECTION PRESSURE SYSTEM

Next: p3640, !f3641

OBSERVATION PUMP RUNS

Next: p3642, f3643

PUMP LIMPET TEST

Next: p4958, !f3649

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p3646, !f3647

OBSERVATION BOILER RESET FAULT CODE 351

Next: !p3681, !f3682

INSPECTION PRESSURE SYSTEM

Next: p3687, !f3688

OBSERVATION PUMP RUNS

Next: p3689, f3690

PUMP LIMPET TEST

Next: p4985, !f3696

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p3693, !f3694

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p3740, f3741

RESISTANCE SENSOR FLUE

REMOVE AIR INTAKE FROM APPLIANCE
DISCONNECT WIRES FROM FLUE SENSOR

Next: !p3744, !f3745

PRESSURE EXPANSION VESSEL

DRAIN BOILER PRIMARY SYSTEM WATER FROM BOILER

Next: !p4051, !f4052

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p3769, !f3770

VOLTAGE RECTIFICATION CIRCUIT (DC)

{GAINPCBACS}

Next: !p3786, f3781

INSPECTION RECTIFICATION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p3784, !f3785

PRESSURE GAS INLET

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p2319, !f3799

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p3787, !f3821

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p2321, ?3832, ?3834

OBSERVATION PUMP RUNS

Next: p3839, f3840

PUMP LIMPET TEST

Next: p3880, !f3846

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p3843, !f3844

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p5039, !f3882

INSPECTION EXTERNAL BYPASS

Next: p3883, !f3884

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p3885, f3886

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: !p3894, !f3895

INSPECTION CH TEMP SETTING

Next: p4067, !f3902

OBSERVATION BOILER RESET FAULT 363

Next: !p3947, !f3948

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p3950, f3951

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p3958, !f3959

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p3954, !f3955

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3956, !f3957

VOLTAGE RECTIFICATION CIRCUIT (AC)

{GAINPCBACS}

Next: p3960, f3961

VOLTAGE RECTIFICATION CIRCUIT (DC)

{GAINPCBACS}

Next: !p3966, f3967

INSPECTION RECTIFICATION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p3970, !f3971

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p3973, f3974

PRESSURE GAS INLET AND DROP

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p3985, ?3987, ?3989

INSPECTION FLUE

Next: p3977, !f3978

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p3979, !f3980

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p3981, !f3982

INSPECTION HEAT EXCHANGER FLUE WAYS

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p3983, !f3984

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p4004, !f4005

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p3991, ?3992, ?3994

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p3996, f3997

RESISTANCE HARNESS GAS VALVE

DISCONNECT THE PLUG FROM THE GAS VALVE

Next: !p4002, !f4003

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p4006, ?4008, ?4010

OBSERVATION SPARK GENERATOR OUTPUT

DISCONNECT THE IGNIT

Next: p4012, !f4013

RESISTANCE IGNITION LEAD

DISCONNECT THE IGNIT

Next: p4014, !f4015

INSPECTION ELECTRODE ASSEMBLY

REMOVE THE ELECTRODE ASSEMBLY

Next: !p4016, !f4017

INSPECTION CONDENSATE PIPE

Next: p4019, !f4020

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p4021, f4022

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p4037, !f4038

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p4025, ?4027, ?4029

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p4031, !f4032

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p4033, !f4034

INSPECTION HEAT EXCHANGER FLUE WAYS

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p4035, !f4036

PRESSURE GAS INLET

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p4039, !f4040

INSPECTION FLUE

Next: p4041, !f4042

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p4043, ?4045, ?4047

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p4049, !f4050

OBSERVATION FAULT CODE AT SHUTDOWN

CH TEMPERATURE CONTROL SET TO MAX

Next: p4061, f4062

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p4065, !f4066

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p4068, !f4069

OBSERVATION DOES APPLIANCE RUN SELF CHECK

REMOVE THE OUTER CASING

Next: p4109, f4110

INFORMATION BLANK DISPLAY

THE DISPLAY FOR THIS

Next: p4123, !f4124

RESISTANCE FUSE (PCB)

REMOVE THE FUSE FROM ITS HOUSING

Next: p4117, f4118

OBSERVATION DISCONNECT LOW VOLTAGE HARNESS AT PCB

{GAINPCBACS}
DISCONNECT CONNECTOR LV2 AT THE PCB

Next: p4831, !f4122

OBSERVATION BOILER SELF CHECK NO DISPLAY

ENSURE NO DEMANDS

Next: p4396, ?4127, ?4129, ?4131, ?4133, ?4135, ?4137

VOLTAGE PUMP AT PCB (NO DISPLAY)

{GAINPCBACS}

Next: p4169, !f4170

INSPECTION CODE PLUG

LOWER CONTROL PANEL

Next: p4163, !f4164

VOLTAGE FAN SELF CHECK

{GAINPCBACS}

Next: p4159, !f4160

INSPECTION WATER INGRESS GAS VALVE AND PCB

Next: p4153, !f4154

TEMPERATURE FLOW (BOILER FIRING)

Next: p4147, !f4148

TEMPERATURE FLOW (PUMP RUNNING)

Next: p4139, !f4140

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4141, f4142

RESISTANCE FROST PROTECTION

{GAINPCBACS}

Next: !p4145, !f4146

VOLTAGE CH AND DHW DEMAND INTO BOARD (NO DEMAND)

GAIN ACCESS TO THE I

Next: p4149, !f4150

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p4151, !f4152

RESISTANCE GAS VALVE AND HARNESS TO EARTH

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: !p4155, f4156

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p4161, !f4162

VOLTAGE FAN SELF CHECK

{GAINPCBACS}

Next: p4165, !f4166

RESISTANCE HARNESS FAN

DISCONNECT FAN CONNECTOR FROM FAN

Next: !p4167, !f4168

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p4171, !f4172

INSPECTION RESET SWITCH

Next: !p4192, !f4193

INSPECTION RECTIFICATION ELECTRODE

REMOVE THE ELECTRODE ASSEMBLY

Next: !p4215, !f4216

INSPECTION CONDENSATE PIPE

Next: p2172, !f4278

INSPECTION CONDENSATE PIPE

Next: p3949, !f4266

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p5183, f4272

INSPECTION ELECTRODES IGNITION AND RECTIFICATION

REMOVE THE ELECTRODE ASSEMBLY

Next: !p4279, !f4280

INSPECTION PRESSURE SYSTEM

Next: p5137, !f4298

OBSERVATION DIVERTER VALVE OPERATION (DHW)

REMOVE THE DIVERTER

Next: !p4582, f4845

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p5187, !f4434

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p4299, !f4300

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4301, !f4302

PUMP LIMPET TEST

Next: p4303, !f4304

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p5192, f4428

OBSERVATION COLD WATER SUPPLY

Next: p4310, !f4323

INSPECTION FLOW COMPONENTS

DRAIN THE DOMESTIC H

Next: !p4312, ?4313, ?4315, ?4317, ?4319, ?4321

OBSERVATION FAN RUNS

ENSURE BOILER IS COOL

Next: !p4397, f4398

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p4417, !f4418

RESISTANCE FLOW SENSOR HARNESS

DISCONNECT THE INLIN

Next: p4403, !f4404

INSPECTION FLOW COMPONENTS

DRAIN THE DOMESTIC H

Next: !p4405, ?4407, ?4409, ?4411, ?4413, ?4415

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4419, !f4420

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p4421, f4422

RESISTANCE SENSOR FLUE

REMOVE AIR INTAKE FROM APPLIANCE
DISCONNECT WIRES FROM FLUE SENSOR

Next: !p4425, !f4426

INSPECTION CONDENSATE PIPE

Next: p4439, !f4440

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p4441, !f4442

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p4443, !f4444

PRESSURE FAN SELF CHECK

ATTACH FGA TO FAN PRESSURE TEST POINT

Next: p4529, f4530

PRESSURE GAS INLET AND DROP

ATTACH U-GAUGE TO GAS INLET PRESSURE TEST POINT

Next: p4541, ?4543, ?4545

INSPECTION FLUE

Next: p4533, !f4534

INSPECTION FAN BEARING PLATE

DISCONNECT THE FAN C

Next: p4535, !f4536

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: p4537, !f4538

INSPECTION HEAT EXCHANGER FLUE WAYS

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p4539, !f4540

INSPECTION AIR INTAKE FAN

REMOVE THE FAN AIR I

Next: p4560, !f4561

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p4547, ?4548, ?4550

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: p4552, f4553

RESISTANCE HARNESS GAS VALVE

DISCONNECT THE PLUG FROM THE GAS VALVE

Next: !p4558, !f4559

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: p4562, ?4564, ?4566

OBSERVATION SPARK GENERATOR OUTPUT

DISCONNECT THE IGNIT

Next: p4568, f4569

RESISTANCE IGNITION LEAD

DISCONNECT THE IGNIT

Next: p4574, !f4575

RESISTANCE HARNESS PCB TO SPARK GENERATOR

DISCONNECT PLUG FROM THE SPARK GENERATOR

Next: !p4572, !f4573

INSPECTION ELECTRODE ASSEMBLY

REMOVE THE ELECTRODE ASSEMBLY

Next: p4576, !f4577

INSPECTION BURNER ASSEMBLY

REMOVE FAN/MANIFOLD ASSEMBLY
REMOVE THE BURNER/BAFFLES ASSEMBLY

Next: !p4578, !f4579

INSPECTION PRESSURE SYSTEM

Next: p4601, !f4602

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p4603, !f4604

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4605, !f4606

PUMP LIMPET TEST

Next: p4607, !f4608

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p4617, f4610

VOLTAGE CH DEMAND INTO BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS

Next: !p4627, f4628

DISCONNECT INTERNAL PROGRAMMER/RECEIVER

REMOVE & DISCONNECT

Next: !p4640, !f4639

OBSERVATION INTERNAL OR EXTERNAL PROGRAMMER

Next: p4651, f4656

VOLTAGE DHW DEMAND INTO BOILER

GAIN ACCESS TO THE INSTALLER CONNECTIONS
EXTERNAL PROGRAMMER CALLING FOR DHW

Next: !p4652, f4653

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p4704, !f4662

OBSERVATION DIVERTER VALVE OPERATION (CH)

REMOVE THE DIVERTER

Next: p4705, f4851

INSPECTION DIVERTER VALVE BODY

REMOVE THE DIVERTER VALVE ACTUATOR FROM THE DIVERTER VALVE BODY

Next: p4713, !f4714

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4715, !f4716

PUMP LIMPET TEST

Next: p4717, !f4718

INSPECTION EXTERNAL BYPASS

Next: p4719, !f4720

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: !p4721, !f4862

OBSERVATION BOILER RESET FAULT CODE 351

Next: !p4734, !f4735

OBSERVATION DISCONNECT DHW FLOW SENSOR

IF NOT ALREADY DONE,

Next: !p4832, !f4833

RESISTANCE DIVERTER MOTOR HARNESS

REMOVE CONNECTOR TO DIVERTER VALVE MOTOR
DISCONNECT CONNECTOR LV2 FROM THE PCB

Next: !p4848, !f4849

RESISTANCE DIVERTER MOTOR HARNESS

REMOVE CONNECTOR TO DIVERTER VALVE MOTOR
DISCONNECT CONNECTOR LV2 FROM THE PCB

Next: !p4854, !f4855

TEMPERATURE DIFFERENTIAL FLOW AND RETURN INTERNAL

PLACE TEMPERATURE CL

Next: p4949, f4950

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: !p4956, !f4957

INSPECTION EXTERNAL BYPASS

Next: p4959, !f4960

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p4961, f4962

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p4965, f4966

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p4969, !f4970

RESISTANCE SENSOR DHW

REMOVE CONNECTOR TO DHW TEMPERATURE SENSOR

Next: p4971, !f4972

OBSERVATION RUN BOILER TO TEMPERATURE

ATTACH TEMPERATURE CLAMP TO BOILER FLOW PIPE
PLACE TEMPERATURE PROBE IN FGA TEST POINT

Next: p4973, ?4975, ?4977, ?4979

INSPECTION SEAL INTEGRITY

Next: !p4983, !f4984

RESISTANCE SENSOR OVERHEAT

DISCONNECT WIRES FROM THE OVERHEAT STAT

Next: !p4981, !f4982

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p4986, f5008

INSPECTION EXTERNAL BYPASS

Next: p4995, !f4996

TEMPERATURE DIFFERENTIAL FLOW AND RETURN

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p4997, f4998

OBSERVATION RUN BOILER TO TEMPERATURE (276 350 FAULT CODE)

Next: !p5006, !f5007

RESISTANCE SENSOR DHW AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR LV1 FROM THE PCB

Next: p3739, f5036

TEMPERATURE DIFFERENTIAL PLATE HEAT EXCHANGER

PLACE TEMPERATURE CLAMPS ON FLOW AND RETURN PIPES AS SHOWN

Next: p3881, f5054

TEMPERATURE FLOW (BOILER FIRING)

Next: p5162, !f5086

TEMPERATURE FLOW (PUMP RUNNING)

Next: p5077, !f5078

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p5079, f5080

RESISTANCE FROST PROTECTION

{GAINPCBACS}

Next: !p5083, !f5084

VOLTAGE CH AND DHW DEMAND INTO BOARD (NO DEMAND)

GAIN ACCESS TO THE I

Next: p5087, !f5173

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p5175, !f5176

RESISTANCE FLOW SENSOR HARNESS

DISCONNECT THE INLIN

Next: p5107, !f5108

INSPECTION FLOW COMPONENTS

DRAIN THE DOMESTIC H

Next: !p5109, ?5111, ?5113, ?5115, ?5117, ?5119

VOLTAGE PUMP AT PCB

{GAINPCBACS}

Next: p5122, !f5123

RESISTANCE HARNESS PUMP

DISCONNECT THE PLUG FROM THE PUMP

Next: !p5124, !f5125

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: p5129, !f5130

RESISTANCE SAFETY CIRCUIT

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p5131, f5132

RESISTANCE SENSOR FLUE

REMOVE AIR INTAKE FROM APPLIANCE
DISCONNECT WIRES FROM FLUE SENSOR

Next: !p5135, !f5136

OBSERVATION BOILER OUTPUT DHW (KW)

Next: p4297, !f5157

OBSERVATION BOILER OUTPUT CH (KW)

Next: !p5160, !f5161

OBSERVATION CH OR DHW DEMAND DISPLAYED

ENSURE NO DEMANDS

Next: p5085, f5168

OBSERVATION DISCONNECT DHW FLOW SENSOR (SELF CHECK)

DISCONNECT INLINE CONNECTOR BETWEEN PCB AND DHW FLOW SENSOR AND MAKE SAFE

Next: !p5171, !f5172

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}

Next: !p5184, !f5185

RESISTANCE SENSOR FLOW AND HARNESS

{GAINPCBACS}
DISCONNECT CONNECTOR LV1 FROM THE PCB

Next: !p5188, !f5189

OBSERVATION DHW BOILER OUTPUT (MIXER TAP PASSING)

Next: p5196, !f5194

INSPECTION GAS SUPPLY TUBE

UNCLIP THE GAS SUPPLY TUBE FROM THE GAS VALVE

Next: !p5197, ?5198, ?5200

DISCONNECT COMFORT CONTROLS

{GAINPCBACS}
DISCONNECT PLUG MARKED "EMS" ON RIGHT HAND SIDE OF BOILER WIRING AND MAKE SAFE

Next: !p5206, !f5207

OBSERVATION DISCONNECT IGNITION LEAD

DISCONNECT THE IGNITION LEADS FROM THE SPARK GENERATOR AND MAKE SAFE

Next: p5216, !f5219

INSPECTION IGNITION LEAD

DISCONNECT THE IGNIT

Next: !p5217, !f5218

RESISTANCE GAS VALVE AND HARNESS

DISCONNECT CONNECTOR HV2 FROM THE PCB

Next: p5222, f5223

OBSERVATION DISCONNECT SPARK ELECTRODE LEAD

DISCONNECT THE IGNITION LEADS FROM THE
SPARK GENERATOR AND MAKE SAFE

Next: p5226, f5227

RESISTANCE IGNITION LEAD (OPEN CIRCUIT CHECK)

DISCONNECT THE IGNIT

Next: !p5232, !f5233

RESISTANCE HARNESS PCB TO SPARK GENERATOR

DISCONNECT PLUG FROM THE SPARK GENERATOR

Next: !p5230, !f5231

OBSERVATION BOILER RESET

ENSURE APPLIANCE IS COOL

Next: p3639, f3625

System Information

  • Total Tests: 998
  • Sequence Logic: Decoded from encrypted .seq file
  • Navigation: Dynamic based on pass/fail results
  • Source: 4731307 GW SWIFTFLOW 100 SIT Control