Question about Sharp R-1870 Convection/Microwave Oven
We have a June 2002-produced Sharp 1870 convection microwave in our motorhome. It has worked great at all temperatures until this year.
I frequently bake breads and pizza at 425-450F. Preheat time for these temperatures are in the 45 minute range, where in previous seasons they were probably half that.
I am not noticing a long preheat time for temperatures below 400.
The oven also doesn't seem to crisp the pizza or bread crust as well this year, as if there is a steam build up during baking.
At 7 years old, is it worth fixing (we are very handy)
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Posted on Jan 02, 2017
I would first suspect the thermister (thermistor) or a low line voltage, weak control board relay etc.
But the service manuals will show you how to safely disassemble, test and repair the unit.
We have the service manuals for this model and have uploaded them to our site here and here to help you.
You will need the free Acrobat Reader to view or print them in case you don't have it.
The best place to order parts for this brand is Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.
Feel free to contact me directly (and please remind me of your full model number) for more information & help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
William E. Miller
Posted on Jan 09, 2009
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