Hi I'm slowly renovating a house and had a new combi central heating system installed about 8 months ago. Every week when I visit the property, the towel rad (highest point in the system) needed a little bleeding. About 4 weeks ago, the boiler's display said "bleed radiators". So I did. Then the display read "call engineer" and the pressure was 0. I called the installer and he said to top it up. I did this to a pressure of 1 bar. The pressure varies between 1 and 2 bar when cold and hot. Is this normal? Since topping up the system hasn't need bleeding. In my uneducated state, I'm thinking that maybe the expansion vessel had a leak and was letting its air into the system. This being the air that needed to be bled every week. And now the vessel is just full of water. What's the likelihood of that being an explanation for the requirement for frequent bleeding? Without a working expansion vessel, would the hot pressure be more than
2 bar? Ta.- posted
7 years ago