Microwave will not heat food. punch in heating time, press start and nothing happens
Will not heat food. punch in heating time, press "start" and nothing happens, light doesn't come on, turntable doesn't turn. Before it stopped working, I noticed a smell similar to when a fluorescent light burns out when it operated. Again, before it stopped working, when you opened the door the turntable would turn without punching any buttons.
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If you're talking about a microwave oven:
 plug the mains cord in to the wall socket
 switch the socket on
 put food to cook on glass turntable, never use empty oven.
 close oven door fully until it clicks
 set the power
 press 'start' or turn the timer-dial,depending on your model.
It will start to cook immediately.
The humming sound is the energy heating the food in timed bursts of power.
If nothing happens or it won't cook, post clear description of fault with problem, make, model.
Hope this helps,
Start out with just a few seconds if you are heating something and increase it if it isn't heated through, Sounds like the wattage is high on your unit or you are using too much time. Don't over do it. Just use a few seconds or a few minutes. Don't use the pre-sets if they are burning your food. Just punch in the seconds or minutes yourself until you learn how much time you need for the food you are cooking or heating.
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.
This seems to be a common problem, there are three parts that will cause this, the magnetron "heats food" a common failure, the high voltage diode and capacitor are the other two culprits. The cost to repair will approach the price of a new oven.
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.
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.
You may have a control board issue. Thank God for safety switches.
This is a problem that an integrated circuit tech. can repair, but it may be costly.
Decide how much you want to put into this oven vs. buying a new one.
Contact me once you decide and I can help you find a service center.