We shifted to a new house with 3 floors. The boiler is in the attic. We have problem with the ground floor radiators which is not heating at all. When we shifted a plumber removed one radiator in the ground floor we are not sure if that is the reason. Its a one pipe heating system. So many plumbers came but no one could find the reason why ground floor heating is not working. We remove all airlock and checked if ground floor rad is getting water and it is, but not hot water. Please help.