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Flushed all radiators and also boiler. Boiler wasnt blocked some black water but not a lot. Only one radiator upstairs working now. Tried to set pump to speed III and switch Off and ON few times to get rid of air. Didnt help. There must be airlocks.

I was able to see trough valves opens, so not completely blocked. Black water was coming out over 1 minute when conected to garden hose.

How can I chech distributor tube please? It is back boiler fitted at bottom of chimney. Only way to be remove wole boiler probably. Old pump replaced due to body of pump was getting hotter than water in pipes. And sometimes didn't spin without help. Thanks.

All radiators have fitted new valves and they are all opened. I flushed downstairs radiators with garden hose last weekend. They wasnt blocked and I think it flushed out all sludge from them but it didnt help at all. This weekend I am going to remove and flush all upstairs radiators.

Good morning guys, I have problem with cold radiators downstairs and very hot water in cylinder. I just fitted new pump ( Grundfos UPS 2 15-60 6m Head). If I set pump to I. speed, Radiators (R3, R4, R5) on first floor get hot but not enough. Downstairs radiators (R1, R2) are cold. If I close...