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how can i fix a potterton prima 50?

i have a potterton prima 50.The air pressure switch seem to be full of condensation which means the boiler will not function.Once you remove the rubber tubes and get the condensation out boiler fires no problem.any suggestions?
A.Cassidy, January 2009
weird but check the inner flue has not rotted away where it joins the fan,can only be water getting into the fan

jim, February 2009
link Click here to see other fixes for Potterton Prima.