It probably blew the main power fuse in side the oven. This may have happen because of a failure in the microwave or a line voltage surge or what ever. Repalce the fuse and see if it work. be sure to unplug it before doing this, If this does not fix it then you have a failure in the oven some were.
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Unplug your microwave and turn it around and remove the screws holding cover on and then remove the cover. Look for where the power cord goes into the back of the unit and follow the black wire from the cord to where it ends. It should stop an either a circuit board or a fuse holder. Make sure that you replace the fuse with the same amperage fuse as what you take out. You will find the amp rating stamped on one of the silver collars on each end of the fuse. Good luck!
Possibly the fuse / breaker is tripped, usually all outlets in one room share same breaker. Check breakers (or fuses) or try outlet in differnt room. If the outlet has power, (plugin a lamp to check) and the microwave still does not work, take it back to store for replacement or refund.
Check whether there is a proper power supply. Look to see whether the cord is connected to a grounded 3-prong outlet and the cord is fully plugged in. If the electrical system is built-in and no power cord is visible, replace or reset the household fuse or circuit breaker.
Some basic microwave operational steps may affect whether the microwave is heating. Open and close the microwave door, as the unit will not function with the door open, and push "Stop/Clear" to cancel any previous settings, such as the timer, which do not heat the microwave oven.
Setting the Microwave
Once the power to the microwave has been reset, or verified as working, and the microwave is ready to run, select a new cook cycle and press "Start" to see if the microwave begins to run and cook food as expected. Allow the food to cook for the alloted time and then open the microwave door and check to see if the food has cooked or heated. Choose a longer cooking time and restart the microwave if food is heating but is cooking slowly.
If all efforts to troubleshoot the function and power to the microwave still do not get the appliance heating food as expected, there may be a repair issue that needs to be addressed. Contact professional technician for advice.
The solution to make your microwave oven to be able to heat food is detailed given below.
Make sure the door is closed. If the door is not closed tight, the
microwave will not function.Sometimes food will get stuck in the door
and prevent the latch from working. Use the paper towel to get the food
out, then close the door carefully and listen for the latch to click.
Check the power sources. First, make sure the microwave is plugged in;
the plug may have shifted or slipped partway out of the socket. If it
is plugged in and still does not work, voltage test the outlet the
microwave is plugged into. If you are not getting a reading, the
breaker is probably blown. Reset the breaker for that outlet in your
home's circuit breaker box.
3 Reset the microwave breaker. Take
the back cover of the microwave off with a screwdriver. Inside you will
find a motor. Most microwave motors have a small red reset button on
them. Hit that button. Your microwave should work again if the breaker
was the issue.