y
Favorite Answer
Need to figure out where it is coming from first, if the compressor. As others said, then clean the condenser coils and ensure there is enough air flow around it. If it sounds like it is coming from inside, it could be the evap fan, could be dying, ice build up and such. Could also be the condenser fan, but you can tell if that is working just by looking and such.
Mr. Interesting
Grab the door one each side and simply throttle the entire refrigerator. I have seen this work.
bluebellbkk
Sometimes just a smart kick can do the trick. Yes, I'm serious.
If that doesn't work, THEN do all the stuff the other answers suggest.
Anonymous
Check if the fridge is level and level it if it is not. Unplug it and completely defrost it for 2 days. Clean the space in the back (where the compressor is located) with a blower or a vacuum. Check if the humming goes away.
No joy, it is time for a new fridge it the humming annoys you. The compressor could be on its last legs.
Edwena
Unplug it, open the doors and let it sit for a day. While it is down, clean it up inside and out, front and back. Plug it back in. If that doesn't fix the problem, go buy a new one to replace this one so that your life can return to normal. Then, take this one and see if you can figure out how to buy a part to replace. If you get it working, you will have 2 refrigerators which can be handy and avoid the panic crises when one has a problem.