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i turn off the hot ones upstairs and they go cold and still nothing happens down stairs the rads are still cold. The boiler continues to increase temp quickly and stop at 60 degrees and immediately cool down to 27 degrees in 1 minute..then it starts up again and on we go..

Hi I have done this numerous times but its not worked

I have an open vented heating system and the boiler is a Veissman open vent condenser boiler 100w

hi no i dont have anti gravity

after all the comments and reading up on the system, i think it is a block in the heat exchanger in the boiler, does anyone have a comment on this?

yes pump is on full and open and I have checked it is fitted the right way round Thanks

Hi, yes all the radiators have been balanced and no air pockets found. My plumber is in his 40's and been doing this all his life so experienced! Yesterday when I turned the heating to 30 I started getting heat to the radiators downstairs but it took a while. What seems to be the main problem...

Hi thanks, how do I clean out the cold feed, is that not the same as completing a power flush? Thanks

I have a major problem and my plumber cannot solve it. The radiators down stairs are cold, upstairs are hot, so far I have replaced the pump, replaced the switches, cleaned the system with a power flush, taken every radiator off to clean out and check water flow.The boiler has also been...