Does anyone know how to program the timer at the top if the picture next to the mains switch ? Please help I've figured the rest out just now need to program it so that the bottom heating element comes on overnight to heat up the tank for use the next day but when I press program nothing changes ??? I have rang the immersion heater manufacturer and they have said the timer isn't theirs so I'm clueless as to who's it is and how to operate it
