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potterton combi 80 boiler no heating?

i have a potterton combi 80 boiler i have hot water ( no taps dripping ) but no central-heating but the pump sounds like it is running when the hot tap is urned on ( PCB Modulation board has been replaced recently )
Mark, October 2008
maybe diverter valve rubber

steve, November 2008
i dont have an answer, just a suggestion to try
Diydoctor.org.uk, navigate to the heating section and expect a reply from the infamous htg engineer

mal, October 2008
link Click here to see other fixes for Potterton.