title says it all. Our fridge does this buzzing sound every now and then. Seems to be when the engine turns or or a fan or something of the sort. If we push on the door, it stops (for the time we are holding it).
I think it could be that it is not levelled. Would that make sense? Is this something can be fixed easily?
And while you are at it, roll it away from the wall, unlug it, and vacuum underneath it, including all of the nasty dustballs clinging to the components. Some of what you will see is insulation, and you don't want to disturb the electical or refrigeration components, so be careful, but unless you have cleaned under there in the past year, you will probably be surprised at the filth that you will find. Not that it is likely to be causing the buzzing, but it only makes sense as long as you are down there leveling it, as hardwareman suggested.