Question about Sharp R-1405 / R-140 Microwave Oven

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Display shows nothing, microwave cuts off

I've had this microwave since late 2005 and in the last 6 months or so it has started switching off after 3, 5 or 10 seconds of the heating cycle. It has even  tripped the breaker (15 amp) a couple of times recently. This followed after the display started showing digits only partially. Now the display shows nothing and there is a click, click sound coming from the control panel every time I hit START and the micro switches off. I hit STOP, open then close the door and the micro starts "blowing" for 10-20 seconds (but it does not warm up the food) and then stops. Please help. Thank you for your time.

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  • qwickfix Oct 31, 2007

    Thank you for that diagnosis. Where do I get the parts and is this something that can be fixed easily or do I have to get someone to do it? Thanks.

  • qwickfix Nov 15, 2007

    I sent an email with the numbers on Nov 7 but no reply yet. I don't know if it's your end or mine but here's the info again, nevertheless: The model number is R-1406 and the serial # is 138692. Your help is much appreciated.

  • Anonymous Mar 30, 2014

    HI there, I am trying to microwave something and after couple seconds microwave stops and I read ERR 5 on the display. Can you pls let me know what that means??

    Thank you
    I -



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Same switch problem with my R-1851A but it appears the switch was damaged by the door latch. The lower door latch is bent inward slightly and only hits half of the switch, eventually wearing off a corner of the switch's plunger. This prevents the the switch from getting fully closed without several hits on the open button. Only the lower switch needed replacing.

Posted on Aug 04, 2009

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We repair these control units for $39.95 nationwide. Usually a new one is not needed.

We have info on our service, plus critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya:

Posted on Nov 22, 2007


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You need a couple of cheap microswithes that the door latches hit when you close the door and a new control for your display problem which sharp has had a problem with

Posted on Oct 31, 2007

  • Mike Kaiser Oct 31, 2007

    send me an e-mail to with the model and serial# and i can help you

  • Mike Kaiser Nov 22, 2007

    FFS-BA016/KIT need 1 of these microswitches

    QSW-MA085WRE0 need 2 of these microswitches

    CPWBFB069MRU0 and this is the board you need for your display problem


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Posted on Jan 02, 2017

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