why does pressure guage show 0 on halstead ace high boiler?

check for water leaks on radiators and look outside to see if water is going out of discharge pipework before changing expansion vessels etc, usually on the vessel there is a pressure point for a car footpum, the pressure should read approx 0.75 bar, when the system has no pressure on it u can recharge the pressure with the foot pump

higgs
May 2010

either the expansion vessel needs re-pressurising or there is a blockage to the vessel or the vessel needs replacing if you are familiar with combi boilers it's easy to work out which one it is otherwise it needs a long complicated explaination if you know what and where the expansion vessel it would make things a lot easier

brian
May 2010