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Repair and disassembly guides for Kenmore Microwaves.

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The turntable is spinning as soon as the door is open

The turntable is always running as long as the door is open. It also runs when cooking as it is supposed to, but as soon as it stops cooking and I open the door it starts turning again. How to fix?

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Do you still hear the fan running?


Hi @lobster55,

What is the model number of the microwave oven?

Just verifying that the turntable stops when the cooking has finished and the door is still closed i.e. the door hasn't been opened yet to remove the food, is this correct?


It is a Kenmore model 405.73092310

And yes, the turntable stops when the door is closed and no longer cooking.


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Hi @lobster55

It seems as though there is a sticking primary door interlock switch.

This switch supplies power to the turntable motor and the HV circuit i.e. magnetron, HV diode, HV capacitor, HV transformer.

It should only be operated when the door is closed.

If it is faulty and remains operated with the door open then the turntable motor can operate but the HV circuit (which cooks the food) won't operate because it also relies on a power relay on the control board to be operated when the cooking cycle is started.

Unfortunately if it is a faulty door interlock switch then getting a replacement for it may be difficult. Looking online there seems to be only 5 parts available for the entire oven and none of them are available anyway according to the suppliers I checked. You may have better luck. example 1, example 2 example 3

Be safety aware when working in microwave ovens. The HV capacitor can store >5000V DC for months even if the power has been disconnected from the oven for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it can be accessed after the oven's cover has been removed and before any further work in carried out inside the oven.

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Lobster55 wird auf ewig dankbar sein.

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