F32
Glow-worm
Fan Speed / Hall Sensor Fault
Boiler shows F32, fan speed error, may not ignite
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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
Faulty fan speed sensor, Fan motor failure, Wiring fault between fan and PCB, PCB fan control fault
How to Fix / Troubleshooting
Safety: Isolate power before removing the boiler case. Do not interfere with the flue or combustion chamber unless qualified.
- Reset and listen: Reset the boiler and listen for the fan. If it runs erratically or not at all, F32 is likely genuine.
- Engineer tasks:
- Test the fan speed sensor (Hall effect) output.
- Check wiring harness and connectors between fan and PCB.
- Replace the fan assembly if speed feedback is incorrect.
- Test PCB fan control circuit.
Fan and flue-related work must be carried out by a competent engineer.
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Repair Difficulty
Professional Required
5/5
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