technical issue

I have a Grohmaster 34 480 grotherm 3000EV fitted in our bathroom and recently it starts "whistling" every time its turned on. Our plumber says its not the pipes, its the shower itself. What is wrong with it and can it be fixed?
Asked 10 years ago by Anonymous
You may have a faulty/blocked filter or non return valve.

Answered 10 years ago by Anonymous

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