40
Intergas
Fan Fault / No Airflow
Boiler displays error code 40, no heating or hot water, fan does not start
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed fan motor, Seized fan bearings, Faulty fan wiring or connector, Faulty PCB fan driver
How to Fix / Troubleshooting
Warning: The fan is part of the flue system and combustion safety. Only a Gas Safe engineer may work on it.
- Reset once: Try a single reset. If the fan still does not start and code 40 returns, do not continue resetting.
- Listen for fan: When the boiler attempts to start, you should hear the fan. If there is no sound, mention this to the engineer.
- Check flue terminal: Ensure the external flue is not blocked, which can overload the fan.
- Engineer actions: The engineer will test the fan for power and rotation, inspect wiring, and replace the fan assembly or PCB as required.
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Repair Difficulty
Professional Required
5/5
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