Roca
Fan Stuck On
Furnace fan runs continuously even when there is no heat demand
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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 PCB, Incorrect post-purge setting, Faulty temperature sensor reading high, Wiring fault causing permanent fan signal
How to Fix / Troubleshooting
Safety first: Turn off power before inspecting the control board or fan wiring.
- Allow post-purge: Some Roca models run the fan for a set time after burner off. Wait several minutes to see if it stops.
- Check sensors: If a sensor falsely reads high temperature, the control may keep the fan on. Verify sensor connections and replace faulty sensors.
- Inspect PCB: Look for a stuck or burnt relay controlling the fan. Tapping lightly may temporarily release it, confirming the fault.
- Replace PCB or relay: If the relay is stuck closed, the board or relay must be replaced.
Warning: Do not attempt to modify relay wiring; improper changes can create fire and shock hazards.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (PCB)
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