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I have a Kitchenaid microwave model KCMS145JSS-0. It is no longer heating. What can I do to repair it?

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A Miller

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Check the door safety interlock safety switches for proper operation. You will find them inside the cabinet.

If they have failed, the oven thinks the door is open and therefore will not turn on the heat. This is the most common reason for failure.

Posted on May 30, 2011

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Your microwave oven is an old timer in terms of appliance years. It may turn ou that replacement is the only practical solution.

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I have a microwave model #kcms145jss-o. everything works on it, but it will not heat. Thanks Ray


It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

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You will need to check to find out if the microwave has all the power coming to the critical units.
If the latch switch is active then the turntable and fan must work but if there is no heat, the check on the thermal cut off switch fitted on the side of the cabin , if faulty. , the pwoerr will be cut off to the magnetron. Check also to confirm that the high voltage capacitor is working and not shorted or open.
The relay on the main boarrd also must click to switch on or else the relay or relay drive must also be checked out.

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Let me know how this works out for you.

Benjamin

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I'm assuming your correct model number is KCMS145JSS? You have a broken "release lever", part number AP3033332. It's reference number 7 on the exploded view diagram found here: http://www.appliancepartspros.com/sect/4/g/4/4g4rya32jj.gif You can order it by part number from Appliance Parts Pros here: http://tinyurl.com/gv383 If needed, you can download the owner's manual and installation guide here: http://www.kitchenaid.com/custserv/literature_search_results.jsp?searchTerm=kcms145jss If you need further help, please follow up. I appreciate your rating of this answer.

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