Kospel
Fan Overrun / Control Fault
Boiler fan runs continuously even when there is no heat demand (gas models)
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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
Stuck fan relay on control board, Incorrect post-purge setting, Faulty temperature sensor reporting high temperature, Wiring short
How to Fix / Troubleshooting
Safety first: Isolate power before inspecting internal components.
Steps to check:
- Allow post-purge: Some Kospel gas boilers run the fan for a short period after burner shutdown. Confirm if the fan stops after the expected time.
- Check temperature readings: If the boiler believes it is still hot, it may keep the fan running. Verify that NTC sensor readings are plausible.
- Inspect control board: Look for signs of a stuck relay or damage on the PCB controlling the fan.
- Reset boiler: Power cycle the boiler. If the fan starts immediately and runs indefinitely, the control board may be faulty.
When to call a technician: Fan control issues usually require board-level diagnosis and repair by a professional.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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