Maytag microwave "turntable", light and cooling fan stay on after cooking complete.

This is normal. Kenmore microwaves will stay running with fan and light on for a short time after food is cooked. The reason is to air out the microwave after cooking. Things like pop corn, Bacon etc. have strong smells after cooking. The ventilation helps to remove odors.

I'd look for a defective relay or shorted triac on the control panel circuit board. Either could cause this problem.

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On a few new model microwave ovens, this is a "feature"! It's purpose is to cool the microwave parts down, and to remind you that your food is cooked. Once you open the door, the fan will shut off and stay off when you close the door again. But if not, or if you microwave oven didn't use to do this, then you have a bad door switch.

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It's a door switch that's bad. Probably the secondary interlock switch. You need an ohm meter to verify switch not 'making' electrically. Usually the only thing that causes this switch to fail is from opening the door when the microwave is cooking, secondly, by cooking at very extended lengths of time.

The door switch and safety switch is not adjusted correctly or is not operating at all.

If the inside light comes on when you try to cook, but the turntable and internal cooling fan do NOT, then that's a bad bottom door switch or that switch's mount.

See this helpful text file.

If the inside light, turntable, and internal cooling fan DO all come on when you try to cook, but it does not cook, then you have a bad relay or connection on the control circuit board, which we can repair for $39.95. Details here.

We have the service manual and have uploaded it to our site here to help you.

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You probably have a bad door switch or door switch mount. See this file.

May be a sensor or thermostat for the fan thats faulty therefore it runs all the time.

What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on. The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent. Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second. That's perfectly normal. The relay on the control board must also be turned on before it will actually be cooking.

If the top is open, the upper door switch should be open and the high voltage section should not be energized. That's the way it's *supposed* to work. But that buzzing is worrysome! Does the turntable turn during this condition? Does the inside light come on? How about the fan? If not, then I would doubt that it's cooking. If so, some models will do this. It's not uncommon to notice that the fan and light will try to come on for a split second when you shut the door. This would not indicate a problem. It has to do with the timing of the door switches and a replay on the board. If it's still under full warranty, it wouldn't hurt to call a GE-authorized servicer.