Microwave - Performance Test
If you think that your microwave may not be heating properly, there is a procedure you can use to check to see if it is heating as it should.
Follow the steps below to test the performance of your microwave:
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Place a glass bowl (preferably a 2 quart glass measuring bowl) filled with 1 quart of water in the center of the microwave oven cavity. The water temperature must be between 59 to 75 degrees Fahrenheit (15 to 24 degrees Celsius).
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Heat the water for exactly 2 minutes and 30 seconds on the High power level. The High power level is the default heat setting on the microwave.
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A temperature rise in the range of 28 to 40 degrees Fahrenheit (15 to 22 degrees Celsius) indicates that the microwave oven is heating/cooking properly.
Should service be needed on your microwave, you can schedule a repair appointment with GE Appliances Factory Service.