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how do I fix my boiler control , Landis & Gyr, Model ? circular dial ?

When control on my old Landis & Gyr circular boiler control is set to hot water only , cental heating kicks in at the same time and i cannot turn off, as anyone any suggestions?
I am running a Baxi wall mounted boiler.
John. Accrington, June 2008
sounds like the diverter valve on the boiler is stuck in mid postion....

T, June 2008
link Click here to see other fixes for Landis & Gyr.