Hello, our attic bedroom rad was cold at the top and hot at the bottom and all other rads in house was OK. I bled the air out of the article rad and all the other rads and all rads was working fine but the ground floor rads are completely cold, even the water pipes up to the rads at the valve. I have tried to balance the rads by shutting all the valves on the working rads which sorted the front living room rad out. I shut the valve on this one to balance the kitchen rad but still nothing. Now the boiler keeps saying water flow lockout and none work 😔