Question about Sharp Microwave Ovens

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My microwave convection oven will only run for 59 seconds. If I set it for 1, 2, 3 etc minutes, it will count down to 1sec, 1 min 1sec, 2 min 1 sec etc. Adding 30 sec does not help. Is this a "terminal" issue or is it repairable? It is in my Motor Home so it is a critical component of the kitchen.

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  • dfant19508 Aug 05, 2010

    Not the answer I was hoping for but probably what I expected.



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It could be a stuck keypad or a bad control. Either way it is gonna cost a lot to repair it for the control. You could buy a new oven for what the control costs.

If you need further help, reach me via phone at

Posted on Aug 05, 2010

  • dfant19508 Aug 05, 2010

    Thanks, Since this is a microwave convection oven combo, will it still cost more than a new one?

  • dfant19508 Aug 05, 2010

    Thanks, Since this is a microwave convection oven combo, will it still cost more than a new one?



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1 Answer

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

1 Answer


There are sixty seconds in a minute, so 1 min 60 sec is the same as 2 min. If you want 40 seconds less than 2 minutes then set it for 1 min 20 sec or for 80 sec.

Oct 03, 2013 | Danby DMW139 Microwave Oven

1 Answer

Sharp micro counts down 59 seconds and stops

It seems this has been happening over the last few years. I am a retired appliance tech. My 1870 also started the 59 second routine, Also in a motor home. Pure logic. Had to be the board. New board same results. So now I need to run down a parts manual and possibly service manual, and get the damper switch and motor refered to in earlier posts. Changing out the board was fairly simple. Dropping the unit to change out the other components sounds like it will be a tad bit more difficult.

Oct 14, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

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

Microwave/convection oven in our fifth wheel will not run past 59 seconds. For example trying to reheat a cup of coffee set at two minutes - it will only run for 59 seconds. I am afraid to try the...

looks like the timer brain has packed up on you,,
how old is it,, it may be cheeper to just replace the microwave as there not very pricy now,,there is very little inside them that you could fix your self, however,, putting your hand inside the back could kill you? so dont try it, play safe buy a new microwave insted

Oct 26, 2009 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Sharp model R-1871 shuts off every 59 seconds

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.

See the attached sample drawing for a typical damper assembly.

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

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


Aug 30, 2009 | Sharp R-1871 Convection Microwave Oven

1 Answer


If your unit runs for 59 seconds then stops, the problem is the convection damper motor. (Sharp part # RMOTDA222WREZ).
Unfortunately, you cannot access this from the front - the whole unit has to come down as the entire outside cover has to be removed.
This is a pretty major job and the motor (located below and behind the magnetron tube) is rather hard to remove and get back into place. This is probably better left to an experienced technician. You can call Sharp 1-800-BE SHARP for a referral to an authorized servicer.

Jul 22, 2008 | Sharp R-1870 Convection/Microwave Oven

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