Hi, I have a GE microwave which does not heat. Everything else works fine. Reading the previous posts, I have replaced the Magnetron, Capacitor and the diode. It still not heating up. Any help is greatly apreciated.
Do you own a meter that you can use to do some electrical testing?
Yes, I have a meter.
First, disconnect the power and discharge the capacitor by shorting across the terminals.You’ll need to see if the main circuit board is sending 120VAC to the power transformer. To do this, first disconnect the output from the transformer to the capacitor. Select a cooking cycle and start it. If you don’t get 120VAC to the transformer, the problem is in the control board. Be very careful: You’re sticking hands and instruments in the proximity of lethal voltage!If you DO find the correct voltage; since you have already replaced the other major high-voltage components, the transformer is the next logical replacement.