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not sure if this might help but it sounds a little like its raining inside the pipe between the pump and the heat chamber..... is it possible there is some sort of back steam pressure preventing water flow?

hmmm... head is off, and thing is loose complete and fancy free :? What now?

Thanks for giving me something to check..... I'll let you know how it went.

Thanks for the reply, I don't think the problem is the impeller as it spins even when the system isn't working :? Is it possible for the impeller to spin happily away and yet still be a failed/failing pump?

http://support.microsoft.com/kb/931849 Hope this helps :)

I have the most strange problem, where my central heating sometimes works and other times the rads simply do not get hot :cry: The heating system is a closed combi boiler system. So far I have: 1. Removed all radiators and flushed with a pressure hose 2. Added a cleaner...