Noise from shower until hot water - Grohe Automatic 2000

[kb29r]

Hello I have the above shower and have a problem where there is a horrible noise in the pipes around the shower until hot water comes out of the shower head - then it stops

The shower is powered through my central heating boiler (new Baxi combi) - before that i had a vokera with the same problem - so its not the boiler

Can anyone help

Cheers Ken

 

[kb29r]

Anyone?

 

[John506]

What type of noise?

 

[kb29r]

What type of noise?

A banging noise - I have emailed Grohe and they suggest the non return valves are faulty so will replace these and let you know

Ken