I had a water hammering noise in my GE Adora side by side refrigerator when I tried to dispense water. Do not waste your time or money on repairs. I tried everything from thawing the lines to replacing the water coupler. It's as simple as making sure the water filter is installed correctly. You might have to loosen it a little by twisting a tiny bit to the left or take it off and install it again until the water starts dispensing without the hammering noise. Good luck.