Blomberg Cooling Fan Overrun or Stuck Relay

Microwave fan continues to run for a long time after cooking has finished.

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.

Possible Causes

Normal post-cooling cycle extended by high internal temperature,Stuck cooling fan relay,Faulty temperature sensor reporting high temperature,Control board logic fault

How to Fix / Troubleshooting

Safety: Fan operation after cooking is often normal, but continuous running may indicate a fault.

User checks:

1. Allow time: After heavy or long cooking, allow 10–15 minutes for the fan to stop. This can be normal behavior.
2. Check ventilation: Ensure vents are clear to allow faster cooling.

Advanced: If the fan never stops, a technician should test the temperature sensor and fan relay on the control board.

Repair Difficulty

Medium 3/5

Required Part

Cooling Fan Relay (on Control Board)

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