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I have borrowed a machine and power flushed my system today and have re-balanced valves as shown by the link that was given to me and it has actually helped thanks :) The rads in question are alot more even in temperature now and there are no cold spots now. Its a shame that the pump didn't...

I hoped i would get away with just running cold water through and relying on the mains pressure, but your right i'll hire a machine and flush it properly and see what happens!! many thanks and i'll let you know what the outcome is cheers stef :D

I balanced the rads by isolating all rad valves first and then opened the nearest first by a quarter/half turn gradually increasing till i got to the furthest rad. I flushed the system myself by leaving fernox in for a week as sugested and then opened drain cock down stairs and drained system...

i have a problem whereby two rads downstairs only become warm and at the bottom of the rad its still cold. They are brand new and a week before i had already flushed the system with fernox. I have balanced rads, checked trv's are working, boiler is running 1.5 bar and is at 65 degs. What i have...