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No c/h working saunier duval f23e combi boiler?

hot water working fine but when turning the central heating on it fires up for a few seconds and then switches off, any clues as to what the problem is..
thanks

john
May 2012
Saunier DuvalHeating, Home Heating SystemsHot Water Fine
divertor valve

manwithnoname
May 2012

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