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Simon, Yes I did pretty much as you suspected - other than the fact that the fill for the expansion tank has a stop-valve so I didn't havce to tie up the ball-cock. I blocked off the expansion vent pipe and tried reverse flushing with all the radiators closed and after a few minutes, the...

I've tried opening several bleed valve on upstairs and downstairs radiators at the same time. I also opened the valve on the pump to get it to fill with water so that I could perhaps run the system and clear the blockage but to no avail. I'll try connecting a hose to the inlet for the system...

Having HUGE problems with my central heating. Yesterday I wanted to flush the system and add corrosion inhibitor. I opened the drain cock at the bottom of the system and it drained away quite happlily whilst filling the header tank in the loft from the cold water supply. I then added the...