My microwave is brand new and we replaced it after our old one started shutting off a few minutes into the cooking cycle. We thought it just died. So we bought this new maytag and the same thing is happening. After about 4 minutes it shuts off and takes about 30 minutes to come back on. I thought it was something with the outlet and hired an electrician to come in. My power supply is fine. He thought perhaps my vent might be plugged. We checked the whole vent up to the roof and that is also fine. We are out of things to look for and need some help!!!
If you changed the position on the exhaust fan, go back over the installation instructions again VERY carefully. You might have to adjust a piece on the blower itself, so that it cools the instrument panel. It is very easy to miss in the instructions.
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Possibly a bad oven temp sensor. If the uinit doesnt read a temperature it will shut down to prevent a fire or over heating. The temp sensor is a thermister A temperature variable resistor that changes value as the temp changes. so If the main board doesnt get a response within a vertain resistance range it shuts things down. Sometimes since those parts are in the actual cooking area and subject to the heat and steam from cooking they can rust and break, or just get old and break. Or slam the door and break, you get the idea!!
I am surprised that the GE seervice tech did not explain to you why the microwave will still cook. By saying that transformer is damaged or shot really means that the internal windings may be shorted together so the transformer no longer has as many good windings to produce the original power it did when it was new. That is pretty clear. It will still function a little but the protection circuits inside the microwave would start to shut it down when it overloads by trying to pull more current than the windings inside the transformer can handle. You can replace the transformer yourself if you are a do it yourselfer and are confident around unplugging the transformer with All Power Off and unscrewing a couple of screws that hold it in place. It is pretty straightforward you just need to find the correct transformer (maybe you can buy one from GE or go to www.mwoparts.com which carry all the parts in microwaves for all models especially name brands like yours. Taking the cover off is of course easy. Good luck. Let me know how you do or if I can help you in any other way.