JennAir Cook Relay or Interlock Power Failure

Microwave display and functions work, but the interior light, fan, and turntable do not come on when starting a cook cycle.

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

Failed cook relay on control board, Open door monitor switch, Blown internal fuse in cook circuit, Loose wiring to fan and turntable

Safety First: Unplug the microwave before internal inspection.

Door switch check: Test all door switches for proper operation with a multimeter. Replace any that fail.
Inspect wiring: Trace wiring from the control board to the fan, light, and turntable motor. Look for loose or burned connections.
Check relays: On the control board, inspect the cook relay for signs of overheating or burning. If suspected faulty, replace the electronic control board.

Hard 4/5

Electronic Control Board

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