banging pipes hot water only

[tryer101]

Hi all,

I have a worcester bosch combi boiler fitted about 3 years ago and ever since it was fitted it makes either 1 large bang or sometimes 3 bangs within about 2 seconds of a HOT tap being used. And its ONLY when a hot tap is used. Cold taps are fine.

The bangs sound like they come from close to a radiator in the lounge. I think its the furthest rad from the boiler.

The plumber came back and said couldnt find a problem, "sorry", and left.

Finally got round to google and saw shock arrestors - small and cheap. I cant readily see one fitted so thought it might help.

Should it be fitted on a HW pipe before or after the boiler?

P.s. im on a water meter.

Thanks

 

[catlad]

I had the same issue after having a new sink fitted and the plumber said it can happen sometimes and asked me to change the stop tap pressure by turning it up or down a bit, and it worked !

 

[Baths'N'Gas]

Only fitted a few Worcester’s but from memory your meant to fit shock arrestors on Worcester combis, shock arrestor should be fitted on the cold to the boiler

 

[tryer101]

Thanks for the help.

Will look to fit arrestor on cold feed to boiler.
Will let you know if it works.