I had aproblem with 2 radiators upstairs, they were only heating up at the bottom and were cold at the top. After getting some advice i ran the heating for 10 mins with all the radiators fully open, switched the boiler off and began to bleed the offending radiators. Some air came out of the 1st one then stopped and there was no water coming out. The 2nd radiator didn't seem to release anything. I closed the bleed valves and tried to start the boiler. The boiler starts up but then the pilot light keeps going out after a few minutes. i keep using the manual overide but it still keeps going out, can anyone help.