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I added a sludge remover a few weeks ago and went to drain it out, however I had a couple of problems after I had attached a hose and undone the drain cock. 1) Water only dribbled out of the hose, I was thinking that the washer was stuck, but didn't dare undo the valve completely in case...

I cannot find any thread that matches my problem, so here goes. I keep having to bleed the rads (I only need to bleed one rad to remove the air/gas), at least once a week. Also the other day the boiler failed to start, and upon investigation the ball cock in the header tank was stuck in the...