Question about Sharp R-1870 Convection/Microwave Oven
When I use the Preheat function for the convection mode of my Sharp R-1870 microwave/convection oven, the temperature doesn't reach the chosen temperature setting. For instance, if I set the oven for 400 degrees, it will only heat to 350 degrees. There is always a 50 degree difference. I want to know how to fix this problem.
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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Posted on Jan 02, 2017
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