Product review (3 stars): Sounds like bad bearings or a bearing in the fan motor ...
Bought one of these a while back and it hasn't stopped making noise since it arrived. Have contacted the seller, but he just makes excuses and blames "frost", even though I let it sit for a week, plugged it in OUTSIDE of the fridge, and sat there to listen to that grinding/rattling noise it makes. Sounds like bad bearings or a bearing in the fan motor or rotary mechanism. As such, $50+ for this little thing is a bit much. I guess a positive is, it does somewhat cool the column, but I still have foam issues even with proper CO2 charge, proper line length and clean lines.