F32
Saunier Duval
Fan Speed Control / Communication Fault
Boiler displays F32 and does not start, fan may run at incorrect speed
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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
Defective fan speed sensor, Wiring fault between fan and PCB, Incorrect fan type fitted, PCB fan control failure
How to Fix / Troubleshooting
Safety first: Isolate power and gas before accessing the fan or PCB.
Steps to check:
- Inspect the fan connector and wiring harness for damage or loose pins.
- Ensure the replacement fan (if recently changed) matches the original Saunier Duval part number.
- Reset the boiler. If F32 persists, the fan or PCB will need testing and likely replacement by a professional.
Warning: Incorrect fan operation affects combustion safety. Only qualified engineers should replace or test the fan and PCB.
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Repair Difficulty
Hard
4/5
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