I had a similar issue in my property few weeks ago. After check with plumber and google search. It is due to air in the pipe results in Water Hammer. Could be serious if long term. Damaging pipe, leaking ... You probably want to find a plumber to check. I got that coz I have 2 cylinders for the house and I turned one off (2-3 month) during X'mas and new year. Silly me. The plumber told me no flow of the water in pipes can lead to air appear and that could be a reason. Still working on it and try to find out how to sort out. You don't want the leaking risk and noise after all. T_T作者: mercuriuz1982 时间: 2018-3-19 14:36:37