I have had the above above model in my house for some time, and have not at all been satisfied with the heating output, the radiators, are only partially warm, hot at top and cooler at the bottom, however if the heating dial is left on, then some heat does eventually reach the bottom. I have had the so called 'Power Flush' a couple of years ago, hot water is ok, allbeit slow from the taps, again the dials have always had to be turned up, I am just wondering, would the pump have to be turned up to allow a faster flow rate around the system ? I haven't a clue, but at the edn of the day, the 'rads' aren't heating the rooms !! HEEELP !!

Billy D!, December 2009

Change the thermistors

Bobdylan, November 2011

It sounds like your system is blocked and a powerflush would be a good callas well as an inhibiter in the syatem. Try draining the system and see if the water is black and sludge like. It could p[ossibly be the pump needs replacing. Are the upstairs rads hotter than downstairs?

tyemanone, December 2009

hi sounds like an air lock in the system and possibly in each rad if its a combi sytem there should be a flexi hose connect to boiler and turn of water drain systm open the rads up and slowly close and open avoiding an air lock hope that helps

c.mathieson, December 2009