Hi Guys, hope you can help me. I have the above and has been installed for the last 3 years. i am running it of a combi boiler. For some reason it seems that it can not longer raise enough presure to start the boiler working and only runs cold. i have tried opening it up and adjusting the dial on the inside but to no avail. Can anyone shed any light. Any idea are much apprectiated.
many thanks
many thanks