F03
Ferroli
Flue / Fan Safety Fault
Boiler shows F03; often indicates a flue or fan-related safety fault on some Ferroli boilers.
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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
Blocked flue, Faulty fan, Faulty air pressure switch, Condensate blockage affecting flue path
How to Fix / Troubleshooting
Safety first: Risk of flue gas spillage. Do not attempt to run the boiler until checked by a professional.
- User checks: Ensure the external flue terminal and condensate outlet are not visibly blocked or frozen.
- Engineer checks:
- Inspect and test the fan and air pressure switch.
- Check flue integrity and clear any obstructions.
- Verify condensate trap and pipework are clear.
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Repair Difficulty
Professional Required
5/5
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