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vaillant vc gb 142 e?

when the hot water only is on the central heating comes on as well
A STOKES, November 2011
Probably a diverter valve issue, seeing as you're quoting a vc rather than a vcw, the diverter will be external to the appliance.

Carefree, November 2011
link Click here to see other fixes for Vaillant VC 142 E.