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philc72
I have a ariston class he 30 boiler approx. 18months old. The pressure on the boiler keeps going up, today it has been 3.5 bar. I have released water from a radiator to bring the pressure back down but it comes back up. I have turned off both taps that fill up the tank, but it still goes up. The vessel does not have a valve to put any air back in. I have drained the system today, but to no avail. Any advice would be great. Thanks