Use timer to heat. it runs 2 to 3 sec. shuts dwn.display shows jibberish-reset clock and date-start to heat again - same results over and over no matter what run time is selected.
Sounds like you have a bad smart board, you can try unplugging the unit for five minutes and then back in, if you are lucky this may correct the problem...good luck
SOURCE: run but does not heats
Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food. The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing. There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however. Benjamin
SOURCE: Microwave starts and runs 2
See this FixYa solution. even if your model number is different.
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