Hi, I have recently had a logt conversion and have a grafity fed system. The boiler is in the kitchen along with the cylinder and everything else is in the loft. We have had a new stat put on the boiler along with a new diverter valve and control box. It all seemed to work fine but after 5mins the ait vent spurts out lots of hot water into the expansion cistern and doesn't seem the stop. I have turned the CH off becuase it look like it going to explode. The HW works fine though. Can anyone give any advice as to what I can do.
Many Thanks
Many Thanks
