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Ta for that.... :) Another question; How easy is it to fix a leak in a sealed system? (no tank, etc) I've looked for leaks everywhere i can, but can't find it... no water anywhere.... :? Can it lose pressure because the diverter is faulty?

Hiya... I've been meaning to change the diverter valve in my Vaillant TURBOmax Plus 824 E for some time now (over a year, i'm very slow),... What i'd like to know is, could a diverter problem cause the radiators to be on, even when the timer is switched off, or could that be electrical...