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This error F3 means that your touch control pad has failed on your microwave. Try to unplug the microwave and heat up the touchpad with a hair dryer. Rub your thumb over each button a few times in case one is sticking. Let the touchpad cool down and then plug the microwave back in. If you still get the same error, the touch control panel would just need to be replaced. You'd need to order part number WB27X10816 and it's about $50-60.
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