Yes, it is completely silent. I actually don't know how long I have to unplug it. When I plug it back in, sometimes it starts running, sometimes it doesn't. Even when it doesn't appear to re-start after plugging back in, I have found it running again a day or two later. So I am not sure if unplugging it is actually doing anything.
Thanks for the quick response. It seems like most of the time it does not immediately restart (now that I think of it), which would mean it would be the defrost timer. Can you tell me roughly where that is located?