Hello,
Last year I put some fernox in the system and flushed it out and put in inhibitor. The radiators are so much hotter than they used to be, and the boiler makes less noise.
But...
Now two radiators downstairs are not getting hot unless I turn the other ones upstairs off. Presumably, blockages in the upstairs cirtuit are cleared and less pressure/flow is available to the downstairs radiators.
Can anyone suggest anytthing I can do to improve the flow downstairs. I've put some sludge remover (Sentinel X400 or something similar - can't remember the name) in to make sure there's no blockage downstairs.
thanks
JB PS. Pump is quite new (fitted it after flushing with fernox) and quite powerful in terms of output. Can check on make/model if necessary