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hi thankyou for the advice,you were right,hotwater fixed now thanks to you.

Hi,I have a potterton suprema60,I have no hotwater if CH is off,but a.s.a CH turns on,HW start working,BOTH Valves works,it's just the valve for HW that not start the pump,I think I've got some air in the system but don't know where looking for the vent pipe or how to vent the system?