Question about Whirlpool Microwave Ovens

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Microwave manufactured July 2009 --- Just stopped heating. Still runs but food/drinks are ice cold no matter how long you leave them in or how high the temperature????? Everything else still works fine - clock, light, timer --- just doesn't heat.????

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There is no temper selection per-ce. The microwave is either 'on' or 'off' as it heats. Temperature is related to time selected.

Do you frequently open the door to check the contents while the oven is running? Most people do. When you do this, you invoke the door safety interlock system. This system protects you from dangerous microwave radiation. With the door closed, there is no danger.

What's happening? When you open the door with the oven operating, you open the tiny contacts on the little micro switches that make up the safty interlock. As such, you send a spark through them, burning them a little bit. A little bit added to a little bit added to a little bit adds up to quite a bit and eventually, they fail. When they fail, they are not able to signal to the oven that the door is in fact closed. If the door is not closed (forget what you know about the door) the magnatron will not energize thus no heat. This is, in my experience, the #1 reason for a microwave to fail.

Remove your cover, find the switches and verify their proper operation with a volt/ohm meter. If you call a serviceman to do this for you, expect to pay $100.00 and up. Of course, if you dont know what a micro switch is, don't have a VOM or how to test, this will be money well spent.

Be aware, there is a device inside the cabinet that if you touch the terminals, it can seriously injure or kill. It is the small can, usually silver, that has two terms on the top. It 'stores' electricity in the thousands of volts. DONT TOUCH IT.

I hope this answers your question. Thanks for your question @ FixYa.com

Posted on Sep 19, 2011

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