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Worcester 350 Combi - radiators not always heating up?

My Worcester 350 Combi is not always heating up the radiators as it should, The hot water works fine but the radiators heating up sometimes works and sometimes doesnt. I have bled the radiators but am now a bit unsure what to do?? any ideas.
Chris 1, October 2009
Thanks M do you know if there is anything i can do for this or do i need to get a plumber to come and replace it??

Chris 1, October 2009
Sounds like your central heating pump is sticking.
This boiler has two pumps. One for CH and one for DHW.

M, October 2009
link Click here to see other fixes for Worcester.