• Nothing will happen. Some electricity will be consumed to keep the mircrowave running for 5 mins. And that's it.
  • Nothing other than wasting electricity. If you want to use it as a timer turn the power setting to zero and set whatever time you want, you will use a lot less electricity.
  • That's dangerous and can ruin your microwave.
    • Linda Joy
      Here's a link from GE, but there are several if you Google it even wikiHow says not to

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