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Thanks Andy, I will try to reduce the pressure and see what happens ? Why is my filling loop tap not doing anything ?? I have removed radiators in the past for decorating and always been able to refill using the filling loop, but now I get nothing at all !!

Firstly, thanks to anyone who replies. My boiler is a Worcester 35CDi, combi. The problem I have, is when you run the cold tap, the PRV activates, spewing water out of the vent pipe and making a loud vibrating noise - This doesn't happen every time, but when it does, you can stop it by...