RTH2300/RTH221
19 69-2727ES—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
16).
Heating or cooling
system does not
respond
• Set system switch to Heat (see page 7). Make sure the temperature is
set higher than the Inside temperature.
• Set system switch to Cool (see page 7). Make sure the temperature is
set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
In case of difficulty
