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heating not working on my primaf 60 potterton boiler?

rads onlt get hot when hot water is turned to constant. if i turn heating on i get nothing. have tried changing dirvert vavule still not work.
kevin, February 2009
is it y-plan or s-plan 1or2 valves.y-plan has 3 pipes going to a valve,s-plan has 2 pipes going to a valve.if its y-plan you need to check if it has 3 wires to the cylinder stat and if there is a wire in the clock for hot water off so if the cylinder stat is satisfied it powers the clock for heating,if not has the clock got a setting for gravity this will automatically power the valve when water satisfies

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