Hi, I have just fitted a new radiator in my down stairs office as the old one has never worked since we moved into the house. I now find that the new radiator also will not work. I have turned off the other radiators and now the office radiator works but when I turn the others back on the one in the office stops working. We have a new combi boiler and I am informed that it will heat more radiators than we have. Any advice would be gladly welcome. Thank you