This is from another forum, but it's about a Honeywell thermostat ... 1) press both arrows for about 5 seconds
2) it should display 1 1 or 1 0 (big 1 small 1)
3) press 'up' twice until it shows 14 0 (big 14 small 0)
4) press 'down' to change the small 0 to a small 1
5) it should display 14 1
6) press both arrows for about 5 seconds to exit the setup menu
And this is website/phone number info that might help: http://yourhome.honeywell.com/home/Products/Thermostats/Digital-Non-Programmable/PRO+3000.htm
1-800-468-1502
2) it should display 1 1 or 1 0 (big 1 small 1)
3) press 'up' twice until it shows 14 0 (big 14 small 0)
4) press 'down' to change the small 0 to a small 1
5) it should display 14 1
6) press both arrows for about 5 seconds to exit the setup menu
And this is website/phone number info that might help: http://yourhome.honeywell.com/home/Products/Thermostats/Digital-Non-Programmable/PRO+3000.htm
1-800-468-1502