Mario for Model Number JVM1752SP1SS The microwave appears to be working normally. It runs and lights and beepers work, and turn-table turns, but it does NOT heat up food. In the past, I’ve had some intermittent problems when running the microwave, toaster, and electric stove at the same time. The main breaker box would click off the breaker switch to the kitchen. I would reset the switch and it would work fine for several months before popping off again. Today, I’ve tried resetting the breaker switch, but the microwave still won’t heat food. I’ve even run a heavy-duty extension cord from an outside plug, into the kitchen, and to the microwave. It still will not heat up anything I put in it. What do you recommend?
Answer Hello Mario, The issue can be with the low voltage supply to the magnetron circuit or on the high voltage side. You will first need to determine if 120Vac is being provided to the high voltage transformer from the board. If not, the issue could be a door switch or the board. If the voltage is supplied to the low voltage side of the high voltage transformer. you could have a bad high voltage capacitor, a bad high voltage diode, a bad high voltage transformer, or a bad magnetron. Need to discharge the high voltage capacitor and do some testing with a test meter to determine the cause of the issue. As a note, there are two thermostats mounted to the floor of the unit behind the control panel. One of these is the hood thermostat and is supposed to read open. Read More... Answered by AppliancePartsPros.com | Saturday, October 10, 2020