First time post.
Microwave stopped working last week. Problem originally was microwave would run for about 2 seconds until the magnetron would try to kick in and then it would shut off and reset. Main computer Board was replaced. Didn't fix the problem.
Next i replaced the magnetron. All seemed well and working normal until i noticed something odd tonight. If i am running the exhaust fan, the microwave does not heat. You can tell too because the magnetron never kicks in. Turn off the the exhaust fan, viola, works fine.
I can repeat this crazy pattern every time. I ordered a new diode tonight as i have not replaced that yet. I found out later it was suggested to do that at the time of magnetron replacement.
Any ideas of what it may be? Any help is appreciated!