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Mend Sharp R1874 Microwave Model

How do I fix my Sharp microwave carousel model #R1874,?

Sensor Microwave Convection oven...
When microwave starts it will run for only 59 seconds no matter what amount of time you put on. At 5 minutes, it runs to 4:01, press start again and it runs until 3:02, etc., to 2:03 and on. It cooks whatever is in the oven, but you have to stand there and press start every time. What is wrong and what do we do?

Doreen M.
April 2007
SharpSharp R1874Kitchen Appliances, MicrowavesSharp Microwave Model
I am having the same problem with my R1874. Hope to find the right solution.

Christine
August 2012
Doreen,
I don't know the answer but I am having the exact same problem with my R-1870. It started about 2 weeks ago. I just replaced the control board (the PC board behind the control panel) but it didn't correct the problem. The board cost $180.00, including tax and overnight shipipng, so don't go that route. I will continue looking into solutions. I will post here if I figure it out.

Good luck!

John
April 2007

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Topic

Sharp R1874 Microwave Runs for 59 Seconds - Fix