F3H is a humidity sensor error.
You may be able to clear the error by unplugging the oven for a couple of minutes. Then plug it back in, reset the clock and try again.
If it still has the error after a reset, please write back so we can give you another suggestion.
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SOURCE: microwave error message
unplug your unit for 1 minute and plug it back again, you'll be surprised ...it will work again cheers
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I don't have the model number with me, but I had that problem yesterday when I tried to reheat using "sauce." Then I just tried cooking, and although the timer set, no microwaves heated my sauce -- it was still cold.
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