Question about Sharp R-1870 Convection/Microwave Oven

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Can you adjust the oven temperature so that it is 375 when you ask for 375

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  • Sharp Master
  • 9,047 Answers

That should be the default condition.

The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

In case it may help, the owner's manual is online here:
http://www.microwavedisplay.com/r1870_r1871_r1872_om.pdf

If it's not an operational issue, you probably have a failing thermistor. The part number is FH-HZA053WRE0 (those are zeros, not ohs).

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

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Sep 08, 2010

Testimonial: "Thank you for your quick response, I have tried the hard reset and then left it unplugged for half an hour and still have the same problem. "

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Hi!

Here are two instances when this happens---
  • When the food you're baking is done on top but not on the bottom--or when baking just takes far too long to finish--the bake element may be burned out.

    You may get fooled into thinking it's working, because the oven is hot inside. But many electric ovens use the broil element, too, during the preheat and bake cycles. So the food may be getting heated only by the broil element, which causes poor baking results.

    If the bake element is burned out, replacing it should solve the problem. Otherwise, you need to further troubleshoot the oven's electrical system to locate the defective wire or component.

  • When the temperature is consistent but too high or too low, it could be one of several different things. First check to see if the thermostat sensing bulb has come loose from its holder. It could be lying on the floor of the oven or resting on the heating element. This would cause the oven to not heat correctly.

    If the thermostat bulb is not dislodged, it's likely that the thermostat or sensor is either mis-calibrated or defective.

    Electronic ovens with a digital display use a sensor to monitor oven temperature. To solve temperature problems for these models, you may need to replace the sensor. On some digital-display models, you can calibrate the temperature using the key pad. See your operator's manual for details.

    Ovens without a digital display often use a mechanical system for controlling temperature. On many of these units, you can remove the thermostat knob and adjust the knob itself to more accurately represent the actual setting of the thermostat.

    If, when you remove the knob, there's a screw on the back of it with a small calibration plate, you can loosen the screw, adjust the plate, then tighten the screw again. If the knob isn't adjustable, and the oven temperature is off by more than 30 to 40 degrees, you need to replace the thermostat to solve the problem.
If you find this solution helpful then do rate this solution.

Thanks
Rylee

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