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I am assuming that closing the door is a key to when the problem arises and will usually lead to a faulty door switch(s). The door switch must be made in order for the microwave safety circuit to be completed and let the microwave know that it is safe to operate. Door switch(s) are one repair worth making on a microwave as most other repairs are not worth the cost of the microwave oven. If you are handy you can check to make sure the switches are closing with a multimeter. Please make sure you have unplugged the microwave before attempting to check the switches. You do not need the power on to verify the closing of the door switch(s).
most likely the door latch assembly and or the door switch has failed... there are approx. 3 micro switches located where the door closes... these switches all operate items such as the cooling fan,timer, clock assembly etc... sounds like one of these micr switches have failed and will require getting inside to exam with a meter and check contuinity on close and open when switch is open...good luck to you...
This happens because of a bad door switch . The plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door .
Check also the turntable . It could be out of it's right place .
1:Don't slam your microwave door because this may cause the fuse to blow and this is the reason of bad door switch problem . 2: A microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .
It's a bad door switch or loose door switch mount . There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly .
WARNING : A microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. I strongly recommend you seek the assistance of an appliance repair technician when conducting any microwave oven repair .
Please remove the cover and check the door safety interlock switches found near the latch.
When these switches fail, the oven has no way to know the door is closed and will not turn on the heat. They go bad because we open the door with the door running and there is a arc on the tiny contacts.
There are other reasons for this condition ... this is the most common. Check them. If they are GOOD, repost your question stating you have inspected and tested the switches with a volt/ohm meter and they were good.
Please check the door safety interlock switches. These are the micro switches inside the case that tell the oven the door is closed. When you open the door while the oven is running, there is an arc on the contacts in the switches and they burn a little. After a while, the switches are no longer able to report the door is closed. When the door is not closed, the heat is not turned on. Forget what you know about the door being closed.
there are two switches that are operated by the door prongs as they latch the door closed .. both switches have to be operated to enable the microwave ...you either have something cought in the door seal preventing it from fully closing or one of those switches is out of adjustment .. unfortunatly you have to remove the cabinet to get at the adjustments ... the switches are set so that the door has to be completly closed so there is no RF leakage .. so its a rather critical adjustment .. there is potentially fatal voltage and current inside the microwave so make certain that its not plugged in if you do anything inside ... it would be better to take it to a competent repair person .. that fix should only take a few minutes .. they would have the proper gauges to set it precisely ... if you feel confident that you can do it then you will be able to hear a click as each switch operates as the door is closed .. you should hear two clicks if you shut the door carefully .. loosen the switch that is not operating and move it just slightly until it reliably clicks each time the door is closed .. tighten it there .. make sure the door and its seal are not bent, warped dirty or otherwise damaged ... its a good idea to check for radiation leakage after any microwave fix .. there is a low cost instrument for doing this .. (microwave radiation leakage detecter) ... your repair person would likely have a better one than you can buy .. ...