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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...

[/img] Please could someone advise on what the 3 switches are and how to use this thing ??? I believe the bottom switch is set by the timer and so won't come on unless the timer tells it too and that the top should always be on and the middle should only be put on if I run out of hot...