RTH111
11 69-2603ES—01
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
• Make sure furnace door is closed securely.
• Make sure fresh AAA alkaline batteries are correctly installed (see
page 9).
Heating or
cooling system
does not respond
• Set system switch to
Heat (see page 5). Make sure the temperature is
set higher than the Inside temperature.
• Set system switch to
Cool (see page 5). Make sure the temperature is
set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
In case of difficulty
