Microwave starts running everytime I open the door

The microwave should not run. i open the door and the microwave fan starts running, I dont know if it is actually trying to heat or not, since it scared me. This is the microwave fan that runs whenever I am heating something up, not the vent-a-hood exhaust fan. It has not given me any problems until today. What do i need to look at?

FOLLOW UP:
When I open the door: The turntable does not turn, the light is on (as it should be), but the inside fan runs. I put a piece of foil in the microwave while the door was open and I got no sparks, so I assume that it is not emitting radiation.

When I shut the door: The light goes off and the fan stops (as it should).

When I cook something: everything works fine (I even put a piece of foil in and it sparks, as it should)

Now the microwave does not work. I think it has something to do with the door switch.

I hit start and the counter counts, the light in there is on but the turntable does not turn and it does not heat. any ideas? I puuled the circuit board out and am staring at it.

guppy, I’m having a similar problem - when I hit start everything seems to be working just fine, the turntable turns, the fan works just fine, [COLOR=black]but[/COLOR] it does not heat! Strange, when I open the door while it works, then close it, and let it continue it heats again…

I got help over at another forum. Come to find out mine was nothing more than the micro switches in the door. Turns out it was a very easy and cheap fix. Good luck

Follow my threads over here.

[FIXED] Frigidaire PLMV168KC4 Will not heat or turn