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How can I fix my Vaillant VCW-GB 242 EH?

CH works fine until any DHW flow is turned off. Burner goes out and stays out even though CH is calling for heat. Any ideas?

id
March 2010
VaillantHeating, Home Heating SystemsVaillant 242 Fine
bottem right hand side at the back there is a micro switch, when hot water or heating runing you will see it move to the right or left if not could dieaphram in heating section

erj
March 2010

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