Question about Maytag MMV4205 Microwave Oven

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We were using the microwave the other night and it started making a loud noise like the fan was running (although the fan was not). We let it sit for awhile and try to use it again but the noise came back. The next day I tried to melt some cheese on top of some food and put it in the microwave. The loud noise was there and it didn't cook anything. After 2 minutes, the food was not even warm and you could smell like a burning rubber smell from the microwave.

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The loud noise and no heat means that the magnetron has failed. It the part that generates the microwaves that heat the food. When it fails it shorts out, causing the transformer to heat up. That is what was causing the burning smell. The cost of a replacement magnetron is around $130-150 range so it may not make sense to have it fixed.

Posted on Mar 24, 2011

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A failed magnetron does not make noise unless it is internally shorted. I have repaired thousands of ovens, and have never encountered this. A shorted stack rectifier (diode), or a transformer with shorted turns, or a defective (leaky or shorted) capacitor will cause the oven to be noisy, and not heat.

Posted on Mar 19, 2016

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