Question about Whirlpool GH7145XF Microwave Oven
All electronics, display pannel, clock, light, work but the turn table and heating both quit working at the same time.
The high voltage circuit that supplies power to the magnetron may be separately fused inside.
Unplug it, remove the back panel and look for a fuse clip. The high current fuses (20-30 amps) often have a white ceramic housing and are tubular.
If you have a multimeter at home (you should, they are cheap) you can check the fuse after removing it from the holder.
The reason your other things are still working is that they have separate supplies; the one for the panel will supply only low voltages and not much current.
If you have a meter, check for a largish black plastic component often mounted on the floor of the case. This will be a diode or diode bridge and this can also fail. A meter would let you check it if you have one.
Posted on Nov 28, 2008
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Posted on Jan 02, 2017
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If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.
Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type. In this case it seems that the program controller board has errors specially if the oven heats and shuts off. remove the board, clean and reset.
If there is heating without any issues, you can use the microwave safely
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