banging noise when shower turned on.......................

[tonybrode]

Hello. I have a combi boiler and a shower which is fed off the main water ststem as opposed to electric. Whenever i turn the shower on i get a rapid knocking noise as the water rises to the overhead shower head. This continues for a few seconds until the water is flowing freely and then stops? Could someone please advise. Thanks Tonybrode

 

[PlumbBobBob]

maybe pipes need more clips along route

 

[Guest123]

Yep, sounds like water hammer and proper pipe clipping will help fix it. Also check that the shower isolating valve is correctly opened and any other valves on that run. Maybe dirt got into the shower unit after installation and causing a partial blockage, especially if your mains pressure going to it isn't that good.

 

[plumberdarren]

It is almost certainly a return valve in the shower unit at fault, get the shower serviced or non return valves replaced, I'm guessing it hasn't been a problem before and just started doing it?

 

[tonybrode]

Many Thanks to all of you who have replied. Ill place supporting battens along the 2 1/2 ft riser to shower head. Have already cleaned out all valves and pressure very good from both hot and cold inlet supplies.

maybe pipes need more clips along route