Question about KitchenAid KCMS185J Microwave Oven

11 Answers

I have a KitchenAid KCMS185JSS-2 Microwave oven. A couple of years ago, we had a power surge due to a faulty neutral wire at the pole. The oven was plugged in, but not running when the surge occurred. Ever since then, the microwave would occasionally blow the breaker. It does not happen every time that we use the oven. Sometimes it pops as soon as you push the start button, other times after it has been running for a while. My wife often uses it for the timer alone and it will run forever that way. The oven is on a dedicated 20 amp circuit with 12-3 romex. I took it into the dealer and they ''tested'' it and said that it was okay and that I should check the wiring. I pulled new cable, installed a new outlet and a new breaker all rated for 20 amps. I reinstalled the oven and it worked fine for about a week - maybe 10 uses - then it blew the breaker again. The oven is built built into a custom 27'' wall cabinet,so replacement will be a pain as the new models are a slightly different height. Any help will be appreciated. Thanks

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  • 6 more comments 
  • pgp_home Mar 13, 2009

    How do you test an IC without some sort of sophisticated equipment? Do I just run it until it blows the breaker then take the cover off and feel the ICs on the board to see which one is hot? 

  • pgp_home Mar 13, 2009

    fixe_you's response made no sense

  • pgp_home Mar 13, 2009

    What do you test with a multimeter?

  • pgp_home Mar 13, 2009

    Just how do you "check the control board for repairs"??

  • pgp_home Mar 13, 2009

    The dealer is also one of the authorized service centers.

  • pgp_home Mar 13, 2009

    I guess that I'll have to take the oven out of the cabinet, remove the cover and look inside for signs of an internal short.

  • pgp_home Mar 13, 2009

    The fan runs fine. The black wire goes to the breaker, the white wire goes to the neutral bar and the ground wire goes to the ground buss. All connections at the outlet and in the service panel are tight.

  • pgp_home Mar 13, 2009

    You "experts" are just a bunch of wing nuts. How do I get my money back??

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11 Answers

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  • KitchenAid Master
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DO NOT ACCEPT ADVICE on doit yourself site for repairing a microwave. SERIOUS INJURY AND/OR DEATH can occour, microwaves put out extreme high voltage, only factory trained techs should attemp repairs(people offeringyou advise dont even have appliance background execpt for maybe one or 2)), and yes i see youve already brought to theshop, try another shop, do not open and try to repair yourself!!!!!!!!!!!!!!!

Posted on Mar 13, 2009

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Check out the three ic which controls the circuit breaker voltage on main board .the number of ic are IC276---- IC289 -----AND THE --IC265.this all the ic controls the voltage and current flow on the main board.if they are faulty or weak they may blow the circuit breaker.also check out the door switch if that is not closing properly then also the circuit breaker blows.check out the voltage current of door switch. thanks.

Posted on Mar 13, 2009

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Hi, See if i can help.

If you have or can borrow a clip on amp meter set it to over or around 50amps & clip around wire leading to microwave. But cup of water in microwave & turn on.
Measure amp load from Amp meter. Check neutral line also should be within few 5-8 amps as main line. If your pulling 18 (80%)or more amps your going to overload breaker. Also amps should not exceed manufactured rating of microwave.

Danger be very careful around electrical wires & boxes. They have been know to injure & kill.

Hope this helped. Send comment if you need more help & I will return. Good Luck! Please Rate.


Posted on Mar 13, 2009

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With type of problem, you may have to take it in and have a professional doctor it up. Or, succumb to a new one and be rid of the problems....this could turn into a safety hazard with a lot of alterations to the unit.

Posted on Mar 13, 2009

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Check the fan and make sure it is running constantly when in use,If it stops during use,the transformer unit will go into thermal overload and trip the breaker.

Also check that the wiring is not reversed

Posted on Mar 13, 2009

  • Randy Hough
    Randy Hough Mar 13, 2009

    Only 3 thing cause a trip breaker,


    1. Overload,(Drawing to much amperage for the circuit)

    2. short (Dead or live)(Grounded,non grounded or improperly grounded circuit)

    3. loose connection.(At any connection in the circuit,from the bus bar to the unit connectors)



    It is either the unit is drawing too many amps or a loose connection is causing a higher draw of amperage,since a dead short would kick immediately and you said all connections are tight and the wiring is correct.



    Try the breaker in a different slot as it maybe the connection on the bus bar.

    if not,You will need an amp probe to test the draw on the unit while in use.

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A microwave oven should be used only on a properly wired 3 wire grounded
circuit. Check with a circuit tester to make sure your 3 prong outlet is
correctly wired. Many are not. Install one if it is not grounded. There
is a very important safety reason for this requirement: the return for the
high voltage is through the chassis. While unlikely, it is theoretically
possible for the entire high voltage to appear on the metal case should
certain internal connections come loose. With a properly grounded outlet,
this will at most blow a fuse. However, with the case floating, a shocking
(or worse) situation could develop - especially considering that microwave
ovens are usually situated near grounded appliances like ranges and normal
ovens and wet areas like kitchen sinks.


also check out if any wire is loose internally so if any loose and live wire internally touching the metal parets of the oven also blows the circuit breaker fuse.

Posted on Mar 13, 2009

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Hello i will help u.if it was my house. i would call in a repairman.And i dont would mean for your house wiring.20 amps on a dedicated line should be plenty.I think the microwave needs service. a good serviceman will be able to fix your problem.i think its the power supply.when you had that power surge. it made it a little crispy.this time call a service man or woman from your local area.not the dealer.

Posted on Mar 13, 2009

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The control panel board looks faulty.check the board for possible repairs or else you will have to replace the control board.

Posted on Mar 13, 2009

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Maybe an IC gets warm test anything warmer than natural and wsee if u can replace. its the one that occur the shorting out.

Posted on Mar 12, 2009

  • Jalal Sordo
    Jalal Sordo Mar 13, 2009

    take it apart

    plugg it in outlet

    when its blows the breaker test the hot area!

    the give us the part number

  • Jalal Sordo
    Jalal Sordo Mar 13, 2009

    The Consumer Product Safety Commission warns against do-it-yourself repairs of microwave ovens. Microwave ovens use high voltage which makes it particularly hazardous for consumers to remove the cover and touch electrical parts. The possibility for electrical shock from a microwave oven still exists even after the oven is disconnected from the power source. Even unplugged ovens can cause serious injury.

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  • KitchenAid Master
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You probably need to replace the diode or the control board.

Posted on Mar 12, 2009

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