My over the oven GE microwave is 2.5 years old. Just recently I went to use it and about 2-3 seconds into cooking it tripped my 20 amp breaker. I have also tried it on several breakers and they all trip after about 2-3 seconds of running the Microwave. I took the key pad off, removed the fan and checked for any loose wiring, all seemed good. I put it back together and waited until the following night to check it again. Amazingly it worked. But to my disappointment it only lasted 2 days and the problem came back. Any ideas? I really don't want to spend a small fortune on a repair.
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Inside unit is a cylinder fuse which can blow for a number of reasons. External cover needs to be removed to access. If you are confident in doing this and can find & check the fuse then it would be my first guess. If fuse is OK then you will need to have repaired. If fuse isblown & you replace then it blows again,you will need to have repaired.
The most common suspects are the high voltage transformer and the magnetron.
It's also possible you have a flaky door switch or loose door switch mount.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
The rectifier diode could indeed be bad.
But first I would want to know what value (in uF) the old one was and what is the value of the new one?
If they're too far off, the difference in the capacitive reactance could throw off the "tuning" of the circuit.
The uF value of the capacitor is optimized in relation to the other components used in the system.
Of course, you'd also want to be sure your new cap is at or slightly above the working voltage rating of the old one, too.