This feature allows the thermostat to be placed in either programmable or manual operating mode.
In programmable mode, the thermostat controls the room temperature automatically according to your pre-set program that follows your daily routine. In manual mode, the thermostat operates manually just like a mechanical or non-programmable model. This method of operation is very basic and only shows the room temperature and set temperature; there are no temperature programs, days of the week, or clock times.
To change the operating mode:
LEFT = Manual
RIGHT = Programmable
4. Locate the small black Hardware Reset button on the circuit board labeled HW RST and press it for 3 seconds. Do not hit the button labeled SW RST, this will erase your custom programs.
5. Reset the time and day (all other settings will be remembered)
6. Put the front half of the thermostat back onto the wall.