Microwave loses all power, LEDs, etc. Works again after power drain.
I have a GE cabinet mount microwave model PVM9005EJ2ES (manufactured NOV 2016) that started acting up a few months ago. The first few times, it tripped the Arc fault breaker in the garage. (Test button trips it and allows normal reset.) The gas oven shares this circuit. I would reset it, and the microwave was fine. Then a week or so later, microwave would have no lights on it, clock blank, no beeps on the control panel, no interior light. Nothing. No signs of power. If I unplug it and plug it back in immediately, it's still dead. If I unplug for at least 30 seconds, then plug it back in, the lcd clock does a lamp test then begins working normally. I set the clock and it appears to run fine. (For a while. Sometimes days, couple weeks, or multiple times a day.) To rule out the breaker, I ran a large gauge extension cord to another circuit in the house, not on gfci, or afci. Same issue. I'd walk into the kitchen, blank clock and no signs of power.
(The AFCI breaker was installed at the same time as the microwave during a remodel. About 2017.)
Since I can restore functionality by leaving it unplugged for a short while then plugging back in, i'm wondering if this time unplugged is allowing capacitors to drain, to allow it to work again.
I do warranty pc and printer repairs for work, so i'm sure I could handle a board replacement. I was only able to find a very basic parts diagram to show the teardown. Before I get frustrated enough with it that I grab my toolbag from my truck and start dissecting it, hoping to find a part that “let the smoke out” does anyone have any ideas to where I should check first? Or any leads on better documentation?
Could something like a thermal switch be tripping to lock itself out? Door seems to close and open fine and engage the interior light, so I don't suspect the door switch. The controls are on the door and work with it open.
Is this a good question?