Question about KitchenAid KCMS145J Microwave Oven

2 Answers

Microwave partially heats

I have a Kitchenaid KCMS185JSS microwave since 2002.

A couple of weeks ago it wouldn't heat anything. I found that the door and frame had shorted in two small spots, apparently due to conductive food spots.

I cleaned these and covered the spots with appliance paint.

It worked fine until this weekend. Now it only seems to heat water but nothing else.

Is it time for replacement or repair?

Thank you.

Posted by on

  • William Miller
    William Miller May 11, 2010

    Sounds like you took care of the arcing at the door and frame just fine.

    Now you have a separate issue of poor heating.

    Assuming your inside light, stirrer, and turntable are working, you may have a failing relay on the control board or a failing magnetron.

    First I would suggest removing the stirrer cover in the ceiling of the oven and running the oven for a a minute or so while watching to see if it turns steadily.

    If not, it may be binding or the motor may be bad.

    Please replace the cover when you are done testing.

    Next, the
    following test will provide a suitably accurate measurement of the
    output power of any microwave oven. Variations or errors in performing
    this test will produce uncertain results. If the line voltage (from the
    electrical outlet) is low, the magnetron output will be correspondingly

    Equipment needed:

    - Microwave safe container with 1000 mL (1 Liter) gradation.

    - Fahrenheit or centigrade thermometer


    exactly 1000 mL (1 Liter) of cool tap water into the container. Using
    the thermometer, stir the water, then measure and record the
    temperature. For accurate results the water should be about 60 degrees
    F (20 degrees C).

    Place the container on the center of the
    oven cooking shelf (do not leave the thermometer in the container and
    remove any metal racks), and heat the water (at full power) for 63
    seconds. Use the second hand of a watch, not the oven timer.

    the heating time is completed, immediately remove the container, stir
    the water, re-measure and record the temperature of the heated water.

    Subtract the starting water temperature (step 2) from the ending water temperature (step 3) to obtain the temperature rise.

    determine the output power in watts, multiply the total temperature
    rise by a factor of 38.75 if you're using a Fahrenheit thermometer or
    by 70 if you're using a centigrade thermometer.

    Let us know how it goes, then we can offer further guidance depending on thew results.



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Assuming your power line voltage is right, bearing the whole thread in mind, I'm sure you have a bad magnetron.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

If you follow the safety & disassembly info, this is not a difficult job for a do-it-yourselfer.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 05, 2008

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  • 125 Answers

Its time repair will cost more than a new one

Posted on Dec 02, 2008


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