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Why is the Magnetron of my Microwave overheating?

Hi All,

I bought GE Spacemaker XL 1800 microwave almost 12 years ago. It was working fine until last week since then it has stopped heating. I searched at the Internet and thought it was the magnetron. I ordered a new magnetron at Amazon and replaced with the previous one. After replacing the magnetron, microwave started to heat normally. In the meantime magnetron was overheating. When I used the microwave consecutively for estimated 10 minutes, microwave cut off. Then I changed Diode and capacitor as well and tried different combinations but the problem didn't go away. It is heating food but magnetron gets overheated and cuts off.

Has anyone faced the similar problem ? Should I replace my microwave or is there any solution ?

Thanks in advance.

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Same issue here. Magnetron tests well and no physical damage from what I can see after removing it. Works well but heats up to well over 120c so trips thermal shutoff. Oven is about two years old whirlpool WMH73521CH0. Any ideas? Fan is working. Hate to buy a new magnetron given this one tests well.

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Your braver or more foolish than I am as i won't work on one of this.

Door Switch

Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fails, the microwave will not start or heat. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches does not have continuity, replace it. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace a door switch.)

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Door switches are irrelevant to magnetron overheating.

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He also stated that he had changed magnetron, and capacitor. Stating that he is foolish is irrelevant at this point. Your answer contributes nothing to the discussion.

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There is a fan that pulls air thru the magnetron for cooling check to see if the fan/motor is still working

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Could it be that he bought a substandard magnetron.... It so common in uganda if u replace a microwave with a new magnetron... Probably they are Chinese... They don't have stickers or labels for their make or origin... But they are flooded ib the market... But in case u get an old magnetron in good shape.. It will stop overheating...

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and their is Ribbon Cable on board you just clean

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The thing is, you have done what most technicians would have done. And the answers you are receiving on the forum, are generic as to the obvious reasons. My advise is to get someone who has the test equipment to test the system, the fault you experienced has not been solved by your approach, which under normal circumstances should have been solved.....it could be as simple as an incorrectly installed diode, to a failure on the transformer. A good technician will get to the bottom of it.:-)

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My capacitor to my fan was. Blown and not starting to keep the megatron cool..

Update (09/28/2022)

My capacitor was blown to my fan to start it to keep the megatron cool

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Awesome. Now we know

Thanks for the update

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Shoaib Shafiq wird auf ewig dankbar sein.
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