Radiators downstairs not getting Hot

17 May 2009
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United Kingdom
Radiators downstairs not getting hot, had a new pump installed made no difference. When system is drained and then refilled the downstairs get hot first and when upstairs is bled then downstairs is cold again. If upstairs radiators are turned off then downstairs get warm. I have an agitator in the system at present and the pump seems to be working hard and can get noisy. One other thing to note is that when the central heating if completely switched off the upstairs radiators still get hot. Any help as it is really getting .....
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do u have 3 port or 2 port valve?? easiest way to find out if its faulty wait till the pipes are cold then select hotwater n only the pipe going into the cylinder should get hot if they both get hot then theres your problem. is the pump the right way round too?

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