K
koey2036
hi i've just installed a new heating system in a 3 storey house. its a indirect sealed system im not getting any heat to the rads at the end of the runs. could an air lock be causing these rads not to work? rads at the core of the run are hot. the flow pipe is piping hot between the boiler and cylinder but the return line is not that hot near the boiler? why is the system not circulating properly? don't think there is a problem with the pump. any ideas would be greatly appreciated