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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

home Fix label Heating label_important Home Heating Systems category Vaillantdone

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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home Fix label Heating label_important Home Heating Systems category Vaillant

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

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

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

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