Operating Manual

19 69-2799EFS—03
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• 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.
Temperature
settings do not
change
Make sure heating and cooling temperatures are set to acceptable
ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes for the
system to restart safely, without damage to the compressor (see
page 14).
“Heat On” is not
displayed
• Set the System switch to Heat, and set the temperature level
above the current room temperature (see page 7).
“Cool On” is not
displayed
• Set the System switch to Cool, and set the temperature level
below the current room temperature (see page 7).
In case of difficulty