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raidiators constantly on ?

my rad nearest thermostat is hot other rads are warm when timer is in off position.Boiler is a vaillant ecomax 824e.DHW water is ok.any idea what problem is ,thank you.
dave, January 2010
thanks for reply dicky.the rads get warm without using dhw.ie;timer off during night but rads warm in morning thanks.

dave, January 2010
motorised valve letting by when DHW on??

Dicky, January 2010
link Click here to see other fixes for Vaillant.