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If everything else is working but it won't heat the food, the causes are the magnetron "common failure" or the high voltage capacitor and diode can be a factor, the three work together to heat the food. Depending on the nature of repair it can be close to the cost of a new microwave oven.
There three parts that will cause this, the first is the magnetron "heats food" the most expensive part, followed by the high voltage capacitor and diode, they work in conjunction to generate the high voltage to cook the food.
If it does not heat, with all other functions working, the problem lies with the magnetron circuit. The magnetron is the part that makes the microwaves to heat the food. Typically, the magnetron fails and shorts out. Symptoms when this occurs is a loud hum from the oven and does not heat the food. The replacement magnetron costs are close to the price of a new microwave oven, so it rarely pays to have it fixed.
I have the same problem. Everything seems to work except it doesn't heat up food.
I remember last time when it was working. I pressed the start botton before I closed the door. So it didn't start automatically, and I pushed start and it worked(it still heat up the food), but it doesn't work now. Help Please!!!
I have a Whirlpool Gold GH5184XPQ.