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F-9 Error on Kenmore Ultrawave Microwave Model 721.64682300

Our Kenmore Ultrawave Microwave Model 721.64682300 has a F-9 error on it. Does anyone know what the problem could be? Sears has been out 4 times and still has not fixed the problem! I bought an extended warranty and have tried to get them to replace the microwave but they refuse. The cost of the repairs so far has been about $800.00, much more than replacing the microwave.

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From everything I have read it is a 1100w inverter, I am having the same problem.

Posted on Jun 09, 2009

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F9 is almost always an error related to a bad door switch or door switch mount or misaligned door hinges.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switchor mount trouble can be caused by slamming the door or by opening thedoor while it's cooking without hitting the Stop pad first.

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A pretty reliable test for the Magnetron is to operate the oven and listen for a ticking sound 5-6 times about a second apart. If you can hear the ticking....The magnetron has failed..if no ticking, the control or inverter board failed.

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