Open the thermostat and press "reset" with an open paperclip or other small pointy object.[1] X Research source Set the correct time and day by turning the dial to the "Day / Time" position. Press "Up" to change the date. Press "Next" to set the time and then use the "Up" and "Down" keys to select the correct time.[2] X Research source Move the dial to "Set Weekday Program". Decide what temperature you want at various times of the day. The default heating temperatures are 6 AM - 70?F, 8:30 AM - 60?F, 3 PM 70?F, and 11 PM 65?F.[3] X Research source Change the start times by pressing "up" and "down". Press "Next" to set the desired temperatures using the "up" and "down" keys. Continue changing the times and temperatures till you are satisfied with all 4 modes for the weekday schedule.[4] X Research source Repeat steps 4-7 for the weekend schedule after turning the dial to "Set Weekend Program." Turn the dial to Run and close the cover. Switch on the "Heat" or "Cool" as appropriate.