my ka heater stays on hot,?

Hi Steve, yes the valve does normally fail in the cold setting, I cant see why your mech needs special wiring diagrams? the valve has a permanent 12v supply and the control panel gives out the earth signal to operate the valve, if you want a copy of the wiring diagram contact me on nige110162@hotmail.co.uk and I'll mail you them

nigel
May 2008