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Check the power diode
This electronic component is responsible for transmitting current in one direction. If the diode becomes defective it will cause your microwave to not heat. Test the diode and replace it if necessary.
High voltage capacitor
Responsible for storing electricity, this part is a key component in any microwave. Remove, discharge, and test the capacitor to determine if it requires replacement.
Damaged magnetron
Responsible for generating waves and producing heat. When your microwave is no longer heating properly, replacement will be required.
Thermal Cutoffs
Examine the thermal cutoffs on both the magnetron and the oven itself. Take off one of the leads and using a volt-ohm meter on RX1, check the terminals. If you get a result other than zero, replace the thermal cutoffs.
No heat means the magnetron circuit has failed. It is the part that generates the microwaves to heat the food. Usually not worth fixing since the magnetron costs nearly as much as a new oven. To diagnose, if the oven is on, you will hear a loud buzzing sound if the magnetron is shorted.
Typical microwave diode.
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