Recently got my whole central heating system changed (replaced the old boiler to a Potterton Suprima, and repositioned the boiler and changed all the radiators as part of building an extension).
Following this, [b]whenever the hotwater is swiched on the radiators are getting heated.[/b]
My plumber came and changed the 3way valve, but the problem still exits. He too is puzzled by this! Could someone advice could I do?