Question about Sharp R-1870 Convection/Microwave Oven

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Loud humming when plugged in.

Hi, Just as soon as you plug it in, it makes a loud humming noise. Opening door or pushing buttons does nothing to stop it.Unplug it and it quits. Thanks in advance.

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  • tcsmart Apr 27, 2009

    It turned out to be the damper door motor. Hope this helps someone.

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Please help me


Q - My microwave went dead when I opened the door ( same problem as closed the door ).
A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
Q - My microwave is completely dead.
A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well. 
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1 Answer

I replaced the light bulb, now it displays -F6- and pushing any button causes a humming noise.


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1 Answer

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i fixed by unplugging the microwave with the door open. I plugged it back in and the F6 was gone. I was then able to set the clock and turn the light on/off . When I closed the microwave door, the F6 came back on and the microwave was making a humming noise. I slapped the side of the microwave near the keypad, and the F6 cleared from the readout and the humming stopped. The microwave is working fine now. Don't know why, except maybe slap on the side reset a relay or something. Anyway, I will never by a Sears Kenmore appliance for the rest of my life. The door rattles when you open a close it (like a part inside the door is broken) and this is the second time a fault code has appeared during use. I had GE Profile appliances at my last house, which are more $$ initial cost, but who wants to screw around buying a new microwave every four or five years. I'll happily spend a couple hundred more for the peace of mind and knowing that it will work during Thanksgiving dinner with the family over.

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