The boiler will run fine if I run the hot tap but won't heat the radiators.if I don't run the tap makes a funny noise and I just turn it off just incase something breaks
I have drained the whole system of water from outside due to living in a static caravan and refilled very slowly.and know the boiler fires up perfectly for hot water and shuts back down when you turn the tap off.but still not hot water to radiators