E15
Potterton
Fan Speed / Fan Feedback Fault
Boiler displays E15, with no heating or hot water, and the fan may 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, Faulty fan speed sensor or Hall sensor, Loose fan connector, PCB fan drive fault.
How to Fix / Troubleshooting
Safety first: Isolate power before removing the boiler casing. Do not run the boiler with the casing removed.
User checks:
- Reset the boiler once and listen for the fan starting; if it remains silent, note this for the engineer.
Engineer checks:
- Check for a 230V supply to the fan when a demand is present.
- Inspect the fan for free rotation and absence of debris; spin it by hand with the power off.
- Test the fan speed feedback signal to the PCB (if applicable) and wiring continuity.
- Replace the fan assembly if it fails to start or provide correct feedback.
- If the fan tests OK, suspect a PCB fan drive fault.
Fan replacement is a specialist task due to combustion safety implications.
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Repair Difficulty
Hard
4/5
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