Commercial Chef Stuck in Vent / Fan Mode

Microwave fan runs but turntable and magnetron do not start; unit sounds like it is in a cool-down mode only.

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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

Control board logic fault, stuck relay for fan only, keypad not sending cook command, door switch not signaling closed for cook circuit

How to Fix / Troubleshooting

Safety: Unplug the microwave before internal inspection.

User checks:

  • Press STOP/CLEAR to exit any active program.
  • Reset power by unplugging for 5 minutes, then plug back in and test.
  • Ensure door is fully closed and that the display shows ready status.

Advanced:

  • If the fan runs whenever the unit is plugged in, the control board fan relay may be stuck and the board will need replacement.
  • Check door switches and keypad operation as well.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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