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OTR microwave heats up erratically

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My over the range samsung microwave does not heat up food or beverages everytime. It did heat up a cup

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Old 04-28-2014, 11:34 AM
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Default OTR microwave heats up erratically
Brand: Samsung   Age: 1 - 5 years   

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My over the range samsung microwave does not heat up food or beverages everytime. It did heat up a cup of coffee today. Then I tried defrosting a plate of ice, and it melted it on the defrost cycle so that it was a hot puddle of water. However, I come back later to warm up tea, and the microwave does not heat up the tea, same for the defrost cycle, nothing melted. This machine wasn't working yesterday, so we assumed the tube was shot and ordered a new microwave. I tried it this morning for the heck of it, and it heated food, then it didn't. But now with this erractic behavior, is it a board or magnetron? the Voltage off the relay the other day was 120V not activated; when activated it was 20V.
In the past, I found a microwave oven's magnetron to gradually lose power over time, then one day it is done, not really all or nothing behavior, unless this is another symptom of a bad tube. The OTR ovens are a pain to replace and are expensive! Don't get one if you have space otherwise!

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