Microwave heating for 20-30 minutes with no food. Does not work.

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https://www.ifixit.com/Answers/View/285420/Daewoo+microwave+shines+but+does+not+heat

Time for a new microwave.

It may need a reset. You can do that by unplugging the power for a minute or two, then plugging it back in and setting the clock.

If it still fails, you may have a failing cooling fan or a problem on the control circuit board.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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It is one of three things, the magnetron "heats food" or the high voltage capacitor, and diode. If the magnetron is gone, cheaper to replace the microwave, as far as the other parts go, it will approach the price of a new one.

It indicates the magnetron is getting to hot "that heats the food" when that happens the thermal fuse opens to protect the magnetron from over heating and shuts it down and waits until it is cooler before it resets. The other problem could be the fan not working or not properly that blows on the magnetron, it helps keeps the temperature regulated so it can run hard. If it turns out the fan is fine, then the magnetron is slowly breaking down until it becomes unusable, which means it will need to be replaced "pricey" or buy new "probably cheaper"

dont be a puss just use the thing

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

heatman101-0=-0

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes. Then let us know if the hard reset does not fix it.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

I have a Magic Chef model MC0160UQ. Within 2-3 minutes of heating food it shuts off completely for about 5min. Also, when I select the low fan it does not work, however the high fan works. Please assist with these issues if possible. Am I able to fix or adjust the magnetron myself since it may be overheating? or what should i do?????

A little late for a reply; you probably have replaced it by now.

I suspect it shuts down because the fan is no longer turning on and there is probably a thermal shutoff switch near or on the magnetron to prevent the chance of fire.