Whirlpool Over-the-Range Microwave Door Issue

Whirlpool Over-the-Range Microwave Door Issue

Appliance Tech Tip
January 2017

Courtesy of Fred’s Appliance Academy

DISCLAIMER: Due the danger and complexity of electronics repair, the following shared technical tips are intended for professional reference only. Please refer to manufacturer’s recommendations as Encompass and Fred’s Appliance Academy do not guarantee the accuracy, reliability or safety of this information.
Electrical Shock Hazard: Disconnect power before servicing.
Replace all parts and panels before operating. Failure to do so can result in death or electrical shock.


For that last two years, there have been several trouble calls for the Whirlpool/Maytag brand OTR microwaves (common complaint: Customer can not start the unit and the display says “open / close door.”)

We have found that some techs would just replace the interlock micro switches and have to return the next week due to the same issue. Other techs may just order each piece of the cam assembly, but again they must return a week later for the same issue.  Instead of ordering these items separately, the complete interlock cam/switch assembly come all together in the low voltage wire harness (W10450407). There is an issue with an imperfection in the cam assembly causing the cam to roll over the switch a little too far, causing internal arcing in the switch.

This is a quick, easy repair requiring only a phillips head screwdriver, #10 torx driver and the wire harness. If all parts are replaced together, the problem will be resolved.  Microwaves deal with very high voltages that can cause serious injury or even death.  If you are not comfortable or experienced in microwave repair, DO NOT ATTEMPT THE REPAIR.  Call a professional service company in your area for assistance.


Special thanks to Fred’s Appliance Academy

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Comments (4)

  • Jeff DeBruler Reply

    I have an electronics engineering degree from purdue university. I have been working on appliances for 15 yrs. I am interested in your classes please send me more info. Thank you very much. I am looking forward to hearing from your company. Thanks

    January 8, 2017 at 5:29 pm
    • Kristin Hurst Reply

      Hi, Jeff, our next class is being held Jan. 24 & 25 — Samsung laundry & refrigeration diagnostics. Here is a link to information and a registration form. Thank you for your interest!

      January 9, 2017 at 4:25 pm
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    January 12, 2017 at 7:15 am
    • Kristin Hurst Reply

      Hi, you do not need to code in WordPress, happy blogging!

      January 19, 2017 at 2:18 pm

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