I don't have a room thermostat. Boiler is on winter setting, the switch is pushed to the bottom to be on continuous, in the middle is off. When on the timer setting, I don't understand what you mean by turn the clock manually
I have a Sime Format 100 C boiler, it works fine when I switch it on, however I cannot get it so that it switches the heating on based on the timer. I've followed the instructions in the manual but am having no luck.
I have taken a picture to show you the timer and have set it to come on...