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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Re: heat's water great , won't pop corn

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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Re: heat's water great , won't pop corn

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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Re: heat's water great , won't pop corn

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

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