You need the instructions for the programmer to use it properly.
Basically if you press the select button the light should move from On/Off/Auto/All Day
If you set to All Day it'll bring the heating and/or hot water ON at the first On set point and go OFF at the last Off set point. For example if you have the heating set to come on at 8am-10am and 8pm-10pm, by setting to all day it will come on at 8am and go off at 10pm.
By setting to Auto, this will be on the timer. So would come on at 8am off at 10am, back on at 8pm and off again at 10pm.
You will set the timers using the bottom 6 buttons, for each day, but like I say - you need the instruction manual.
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