Question about Sharp R-1850A Convection/Microwave Oven

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Shuts down after 59 sec

Microwave will shut down after 59 sec, time remains. Must press start again and will run 59 sec more. Doesn't require cool down. Every other aspect is working fine. Ordered new control unit and replaced but same problem still there.

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  • Anonymous Nov 03, 2007

    Our R-1870 had the same problem. Replacing the $10 damper motor fixed it. The tech said it COULD have been the control circuitry, the damper itself, or the microswitch that the damper hits, but it was in fact the motor.

  • MrRat Jan 11, 2009

    Sharp R-1874 With same problem, shuts down after 59 seconds. Ordered damper motor. When it arrives I'll open the case and see if its readily accessible. From the exploded view, it appears to be on the right side of the unit, behind the control panel. Also note that there is a high energy capacitor in the microwave that can store a substantial charge so unplug for at least an hour before disassembling and still be careful what you touch.

  • HotCap Jan 27, 2015

    I bought a Sharp Microwave Oven with Sensor, Grill and Convention functions, R-967(SL)M, a few years ago in London, United Kingdom. Problem: Now, each time the timer counts down to 1 second (for example, 1 sec. or 2 mins. 1 sec. or XX mins 1 sec.), the heating function just stop as long as the timer shows 1 second. In addition, I relocated to Hong Kong and the local Sharp customer service refused to provide any repair service (even if paying!) since I did not buy the product model in Hong Kong! The warranty period has ended, hence there is not an issue with warranty service. The problem exists even when the microwave is switched on and already heated so it has nothing to do with the temperature setting. Present Situation: An approach to solve this problem is to keep on pressing the start/continue button when the microwave heating function stops at 1 second. Then the microwave continues heating and the timer continues to count down till 0 (zero) second. For example, from 1 sec to 0 sec, from 2 mins 1 sec to 1 min 1 sec. Otherwise, all other microwave functions operate as per normal and no other abnormality/damage.



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Replaced damper motor twice! First replacement motor did not turn. Second one was OK, these motors are cheap JUNK. Last Sharp I buy!

Posted on Oct 20, 2008

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Exact same problem. Very common problem with the people we know that have motorhomes with Sharpe R-1874

Mine was the damper motor. $14.95 for the motor.

The total bill for removing and reinstalling in my motorhome with parts was $106.45.

Posted on Apr 06, 2008


It was the damper motor. $10 part fixed it. Thanks

Posted on Mar 04, 2007

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Sounds like someone else got it already, I just got the phone with sharp tech support for the exact same problem, and they said to replace the damper motor and switch if the board didn't do it. Good Luck!

Posted on Dec 21, 2006

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Chances are you have a bad damper switch or wiring. A sample photo is here: It might also be a problem with the humidity sensor or a problem with the control panel, such as corrupted code or bad connections.

Posted on Dec 20, 2006

  • William Miller
    William Miller Nov 05, 2007

    I just wanted to update this reply since it's so popular:

    This is a problem in one of the damper-related components, most likely the switch, but it may also be the motor or the damper door.

    The damper is a door located on the right side of the innards. The damper closes and opens depending on cooking mode.

    If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa:

    You can find an exploded view by entering your model number here:

    You can order parts from Tritronincs at


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Posted on Jan 02, 2017

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Why can i not cook for 20 minutes with oyster microwave it cooks about 7 minutes an shuts off then about 5 minutes later it starts up again.

The unit could be overheating and shutting down, cooling off, and restarting. Check ventilation holes on back for dust accumulation and blockage. Check that cooling fan is turning properly.

Nov 26, 2017 | Microwave Ovens

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Sharp microwave r1870 only runs for 59 seconds

If it consistently runs for exactly 59 seconds, and shuts off, it's probably the control panel.

If it runs approximately that length of time, you might have a defective thermal protector on the magnetron, or the magnetron is running too warm for some reason.

If you need further help, I’m available over the phone at

Mar 24, 2016 | Sharp R-1870 Convection/Microwave Oven

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Stops every 59 sec.

This is a problem in one of the damper-related components, either the switch or motor or the damper door may be binding.

The damper is a door inside that opens or closes depending on cooking mode. If the controller senses that the door is not in the right position, it will shut down the cook cycle.

Sharp models stop after 59 seconds. That's the giveaway.

See the attached sample drawing for a typical damper assembly.

We have the applicable service manuals for some of these models and have uploaded them to our site here and here to help you.

Hopefully these cover your model number, which you didn't mention.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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

William E. Miller


Jul 07, 2010 | Sharp R-1870 Convection/Microwave Oven

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I have a sharp microwave mod.#r-1870 you can set it for 5 will run 59 sec.then shut down you start it right back and it will run 59 sec. and shut down again.

i think there are some problem occured with the autocut n timer....its a genuine prob go to any electrician...thnx

Feb 26, 2010 | Microwave Ovens

1 Answer

This mircowave shuts off after 59 seconds all of the time ????

Change the Damper Motor and switch. Cost is approx $30.00 and you must remove the microwave from the mounting bracket and remove the cover to gain access to the motor and switch.

Feb 02, 2010 | Sharp R-1874 Convection/Microwave Oven

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Amana OTR Convection Microwave runs 59 seconds and shuts off

This sounds like either a thermistor or a damper switch/motor problem.
Amana's technical support line is 866-426-2621. This is the commercial side but they should be able to get you in touch with the domestic side.

Sep 12, 2009 | Sharp R-1850A Convection/Microwave Oven

1 Answer


it sounds like it is overheating. but if only stops for a minute or so dont know if that would be enough time to cool off.When you start it up can you hear the fan running? does it keep running when it shuts down? if it's not running then thats the problem If the fan is running and shuts down when it shuts down then try shaking the door when you start it up the next time or you can try it the first time just to eliminate it being a faulty interlock switch. let me know about what you find about these two ideas.

Sep 02, 2009 | Sanyo Microwave Ovens

1 Answer

Shuts off

change your electrical wall plug to a diffferent one, do not use extention wire pls, there is insufficient to drive your microwave, thats why it resets and restarts again

Nov 25, 2008 | GE JVM2070 Microwave Oven

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