Tower Stuck Relay or Control Board Fault

Microwave light, fan, or turntable stay on after the cooking cycle ends and door is closed.

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

Stuck fan or lamp relay on control PCB, shorted triac, firmware glitch, miswired control harness

Safety: Unplug the microwave if components continue running unexpectedly.

Steps:

1. Power reset: Unplug for 10–15 minutes to clear any control glitches. Plug back in and test.
2. Observe behavior: If the fan or light comes on immediately when plugging in, a relay or triac is likely stuck.

Advanced:

Inspect the main control PCB for stuck or burnt relays controlling the fan, lamp, or turntable.
Replace the control board if the relay is welded closed or the triac is shorted.

Hard 4/5

Main Control PCB

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