Hey guys, I'm a new member here with a problem. I have a sealed central heating system (oil). I drained my system down at the boiler to put some leak sealer in as the system was losing a small amount of pressure. I drained about 4 gallon out the stop cock at the boiler, closed it up and removed the auto air vent, put my sealer in replaced the vent and refilled my system. When I turned the boiler back on it ran for a couple of minutes and then stopped! I slackened the vent and bled the pump. I turned the pump to its lowest setting and the boiler thermo and kept turning the heating on and off. It fired a couple of times but switched off again after a couple of minutes. I bled all the house rads and strangely the upstairs rads are heating when the boiler is on and the hot water tap is flowing warm. Downstairs the radiators are stone cold and the water is cold from the hot tap. I'm out of ideas and tomorrow is sunday! (AND COLD!)
Any help is greatly appreciated
Any help is greatly appreciated