RTHL2510 /RTHL2410
19 69-2579ES—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 17).
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