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Mark sounds like it is tripping a internal limit relay, weak power supply or door switch possibly. Below are links to help diagnose.
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The unit needs to be shut down by cutting power to the oven by either pulling the 110VAC plug from the receptacle or flipping the toggle on the house circuit breakers.
Check the door switches if one is bad it may think the door is being opened and stop the unit from running. If it is from a bad connection it will get worse as it gets hotter while running.
Check the door switch and once the door is shut the board must be active. If there is no clock or display then the processor board is faulty. Also if there is no action from the touch pad then it must be checked. Since the turntable works as you start the processor seems to work but the output to the magnetron is not active. So you need to check the relay to the magnetron switching, check the temperature cut off unit and the main capacitor.
All the above seems to be suspected.
Attempt with care/caution as there is high voltage present.
In all likelihood the mangnetron has failed, or
perhaps even the Power Supply. or a fault that is shutting the system down for
safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before
proceeding, and remember these days the cost of repair can equal or exceed the
price of a new one.
Yes. One of your door switches is not working. It could be an alignment issue or a faulty switch. There are actually 3 switches in the door latch area. Eric
This is usually a broken or misaligned door switch mount or possibly a bad door switch.
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
You can find an exploded view by entering your model number here: http://www3.sears.com
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