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Mend Landis & Gyr Central Heating Boiler Control

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

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