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Boiler with display and pressure gauge
Boiler fault codes

AWB boiler faults: fault codes, causes and parts (page 2 of 3)

Codes 151 to 300 of the 436 fault codes for AWB. Looking for a specific code? Use the search on the first page.

AWB boiler fault codes 151 to 300 of 436

The code list is split over 3 pages. Looking for a specific code? Use the search on the first page: it searches all 436 codes in one go.

CodeCause
F 12No signal on user interface
F 13Incorrect cylinder setting parameter. Main PCB fault.
F 14Flow temperature greater than 95 C
F 14Flow temperature greater than 95 °C
F 15Fault in diverter valve stepper motor. Check wiring. If in order, replace the diverter valve.
F 15Stepper motor fault diverter valve Check wiring. If in order, replace the diverter valve.
F 16Incorrect flame detection. Flame visible for a short time, then goes out. Insufficient earthing of the appliance.
F 16Incorrect flame detection. Flame visible for a short time, then lost Insufficient earthing of appliance.
F 16Incorrect flame detection
F 17Insufficient mains voltage < 170 V ~ Defective fuse. Check the transformer, fuse and wiring. Replace the transformer if necessary. Defective main PCB. Replace main PCB.
F 17Insufficient mains voltage < 170 V ~ Faulty fuse. Check the transformer, fuse and wiring. Replace the transformer if necessary. Faulty main PCB.
F 17Insufficient mains voltage < 170 V ~ Faulty fuse. Check the transformer, fuse and wiring. Replace the transformer if necessary. Faulty main PCB. Replace main PCB.
F 18User interface fault
F 2Fan fault
F 2Fan fault Fan continues to run below the start speed Fuse of external power supply faulty Wiring not in order: Check the fuse and wiring
F 2Fan fault. Fan keeps running below the start speed. External power supply fuse defective. Wiring faulty: check the fuse and wiring
F 2Fan fault. Fan keeps running below the start speed. External power supply fuse defective. Wiring faulty: check the fuse and wiring
F 20Software not compatible
F 21System water pressure too low
F 22System water pressure too high
F 24Return temperature > 90°C. Insufficient or no circulation. See F 5. System resistance too high, bypass insufficient.
F 24Return temperature > 90°C Insufficient or no circulation. See F 5. System resistance too high, bypass insufficient.
F 25Flow temperature rising too quickly. See F 05. System resistance too high, bypass insufficient
F 26Temperature difference between flow and return temperature too large in CH mode
F 26Temperature difference between flow and return temperature too large in CH mode
F 4Check the ignition electrode and wiring
F 4Ignition fault
F 5Maximum limit fault, too high
F 5Maximum limit fault, flow temperature too high. The maximum limit thermostat must be reset manually.
F 6Flow NTC fault NTC is broken, or wiring not in order. Check wiring or replace NTC.
F 6Flow NTC fault NTC is broken, or wiring not in order. Check wiring or replace NTC.
F 6Flow NTC fault. NTC is broken or wiring faulty. Check wiring or replace NTC.
F 6Flow NTC fault. NTC is broken or wiring faulty. Check wiring or replace NTC.
F 7DHW NTC fault. NTC is broken or wiring faulty. Check wiring or replace NTC.
F 7DHW NTC fault NTC is broken, or wiring not in order. Check wiring or replace NTC.
F 7DHW NTC fault NTC is broken, or wiring not in order. Check wiring or replace NTC.
F 8Cylinder NTC fault when using an external cylinder NTC is broken, or wiring not in order. Check wiring or replace NTC. Check parameter 9.
F 8Cylinder NTC fault when using an external cylinder NTC is broken, or wiring not in order. Check wiring or replace NTC. Check parameter 9.
F 8Cylinder NTC fault when using an external cylinder
F 9Water pressure sensor broken or wiring faulty. If in order, replace the sensor. Check the wiring.
F 9Incorrect cylinder setting parameter. Main board fault Check parameter 23. Replace main board.
F 9Water pressure sensor broken or wiring not in order If this is in order, replace the sensor. Check the wiring.
F 9Water pressure sensor broken or wiring faulty. If in order, replace the sensor. Check the wiring.
F 9Water pressure sensor broken or wiring faulty. If in order, replace the sensor. Check the wiring
F. 0Open circuit of flow temperature sensor
F. 1Open circuit of return temperature sensor
F.10Short circuit of flow sensor
F.10Short circuit of flow temperature sensor
F.11Short circuit of return temperature sensor
F.11Short circuit of return sensor
F.13Short circuit of cylinder sensor
F.20Safety shut-down temperature limiter
F.20Safety shut-down: temperature limiter
F.22Safety shut-down water shortage
F.22Safety shut-down: water shortage
F.23Safety shut-down: temperature spread too large
F.24Safety shut-down: temperature rising too quickly
F.25Safety shut-down: flue gas temperature too high
F.26Fault: gas valve unit without function
F.27Safety shut-down: detection of incorrect flames
F.27Safety shut-down: flame simulation
F.28Lockout during start-up: ignition unsuccessful
F.28Lockout during start-up: ignition failed
F.29Lockout during operation: re-ignition unsuccessful
F.32Fan fault
F.32Fan fault
F.42Coding resistor fault (possibly in combination with F.70)
F.49eBUS fault
F.49eBus fault
F.52Mass flow sensor connection fault
F.56Mass flow sensor control fault
F.57Fault during comfort protection mode
F.61Gas valve unit control fault
F.61Fuel valve control fault
F.62Fuel valve shut-off delay fault
F.62Gas valve unit fault. Shut-off delay
F.63EEPROM fault
F.64Electronics/sensor fault
F.64Electronics/NTC fault
F.65Electronics temperature fault
F.67Electronics/flame fault
F.68Unstable flame signal fault
F.70Invalid product code (DSN)
F.70Invalid appliance ID
F.71Flow sensor fault
F.71CH flow temperature sensor fault
F.72Flow and/or return temperature sensor fault
F.72Flow and/or return sensor fault
F.73Water pressure sensor fault
F.73Water pressure sensor signal in wrong range (too low)
F.74Water pressure sensor signal in wrong range (too low)
F.74Water pressure sensor signal in wrong range (too high)
F.75Pump water shortage fault
F.77Flue gas valve/condensate pump fault
F.77Combustion gas valve/condensate pump fault
F.79Cylinder temperature sensor fault
F.83Temperature change fault, flow and/or return temperature sensor
F.84Temperature difference between flow/return temperature sensors not plausible
F.85Fault: flow or return temperature sensor incorrectly fitted
F.86Fault: contact base
F0Loss of water from the system (pressure loss). A defective pressure sensor.
F00No fault
F00Defective temperature sensor in the CH flow pipe
F00Open circuit of flow temperature sensor
F00Open circuit of flow sensor
F00Open circuit of flow sensor. Wire break in flow sensor. Defective flow sensor. Multiple connector on electronics not secured.
F01Open circuit of flow sensor. Wire break in flow sensor. Defective flow sensor. Multiple connector on electronics not secured.
F01Open circuit of return sensor
F01Temperature sensor fault in CH return pipe -
F01Central heating return pipe temperature sensor fault -
F1Ignition fault
F1No flame
F1Overheated boiler
F1Poorly drawing chimney
F1Open circuit of return temperature sensor
F1, F4Ignition fault, boiler has not ignited
F10Central heating return NTC fault
F10Short circuit of flow sensor. Wire earthed on flow sensor. Flow sensor defective. Connector damp.
F10Short circuit of flow sensor
F10Return NTC is broken or wiring faulty
F10Defective temperature sensor in the CH flow pipe
F11Defective temperature sensor in the CH flow pipe
F11Temperature sensor fault in CH return pipe -
F11No signal on main board. Check wiring and user interface. If in order, replace the main board. Fan defect. Replace fan
F11Short circuit of return sensor
F11Short circuit of flow sensor. Wire earthed on flow sensor. Flow sensor defective. Connector damp.
F11Incorrect connection of user interface.
F12No signal on user interface
F13Incorrect cylinder setting parameter / main board fault
F13Main PCB connection fault
F13Short circuit of the cylinder sensor
F14Flow temperature greater than 95 C See F 05, System resistance too high, bypass insufficient
F15Fault in diverter valve stepper motor
F16Incorrect flame detection
F16Flame detection fault (flame present for more than 5 seconds after burner stop)
F18User interface fault
F19Central heating flow NTC
F19Flow NTC fault, dT > 35K 10 times in succession
F2Fan fault
F2A defective heating water sensor, or the heating water temperature is lower than 3 degrees.
F2Fan fault. Fan keeps running below the start speed.
F20Overheating fault
F20Software incompatibility
F20Maximum limit protection (flow temperature too high)
F20Maximum limit protection (flow temperature too high). Vent the appliance and system. Check flow through the CH system. Pump defective.
F22Dry-fire protection. CH water pressure too low < 0.3 bar. Pressure sensor defective. Pump output too low. Pump defective. Wire to pump or pressure sensor defective.
F22Dry-fire protection
F22Water shortage in the system (pressure < 0.3 bar)
F23Maximum temperature difference between the CH flow pipe and return pipe sensors reached
F23Maximum temperature difference between the CH flow pipe and return pipe sensors reached

AWB parts are available from Instalpunt. Back to the first page with the most searched codes and frequently asked questions.

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