Question about Sharp R-820B Convection/Microwave Oven

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Heat's water great , won't pop corn

Sharp R820BC convection/microwave oven 900watts

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  • souldawg Jun 06, 2008

    Even off center, the microwave still won't properly pop popcorn. Everything else is fantastic. However, I really like popcorn...

  • Anonymous Jun 26, 2008

    I place the popcorn in the convection oven press popcorn regular and 2-3 minutes later.. nothing. Help!

  • Anonymous Mar 30, 2014

    not heating



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It may be a food placement issue or possibly a bad humidity sensor.

I always recommend that folks put food off-center on the turntable (not in the center) to assure more even heating.

It's a stirring action, so imagine how inefficient it would be to stir just by twirling a spoon in the center of your coffee!

Also, when you put your food off-center, you're not putting it in the same spot every time. That will help prevent repeated heating of the the same spot on the glass, which can lead to weakness and cracking. Microwave popcorn gets hot enough to do that.

We have the entire service manual at our site if your or a friend want to look that over:

If you need a new sensor, you can order Sharp parts from Tritronics at

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Dec 04, 2007

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It was suggessted to me to use the wire rack to place the popcorn bag on... Seems to work better!

Posted on Jul 13, 2013

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The manual says to put popcorn bag on overturned glass pie plate because the microwave emisions are higher than in a conventional microwave.

However, I do not want to use any more Pyrex because of all the reports of it exploding unexpectedly and injuring many people. I am wondering if this new silicone bakeware could be used to hold the bag instead.

Anyone else use something besides a glass pie plate for their popcorn?

Posted on Dec 10, 2007

  • thebigdog284
    thebigdog284 Nov 30, 2012

    I had a custome rjust put in a standard Dinner plate and this solved the probem


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sometimes an over heat will shut down the oven for a little bit but lets look at other things
i dont believe the board to be bad but i do believe the heating element inside is fried or a wire got fried by heat
if you know how to use ohm tester i would check heating element and wireing first
then try to see if the timer gave out

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