Vaillant turbomax turning off when heating is off - why?
Hotwater in my Vaillant combi turbomax boiler goes cold when the central heating system is off , this is weird that I have to keep my heating on to maintain a certain temperature to keep the boiler on can anyone advise me why this is happening ?
sounds like the hot water micro switch is not operating, seems as though the valve in moving across but not operating the switch
(diverter valve switch)
