E12
IBC
Combustion Fan Speed / Feedback Fault
Boiler displays E12; may indicate fan speed out of range or fan feedback error.
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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 speed sensor (Hall sensor), Obstructed fan wheel, Loose fan connector, Defective control board fan driver
How to Fix / Troubleshooting
Safety: Disconnect power before accessing the fan assembly.
- Inspect fan wheel: Remove the front cover and visually inspect the combustion fan wheel for dust buildup, foreign objects, or damage.
- Check wiring: Ensure the multi-pin connector from the fan to the control board is fully seated and free of corrosion.
- Spin test: With power off, gently spin the fan wheel by hand. It should rotate smoothly without grinding.
- Reset and test: Restore power and reset the boiler. If E12 returns, the fan or control board may be defective.
Replacement of the combustion fan or control board should be performed by a qualified technician, as incorrect operation affects combustion safety.
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Repair Difficulty
Hard
4/5
Required Part
Combustion Fan Assembly
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