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Troubleshooting Tips
If . . . Then . . .
Key to the right of the
Screen key is blank.
Verify that this key remains blank unless you
set the Furnace Filter Change Reminder. See
Installer Setup Number 0500 in Step 11.
Display is blank. Check that fresh AAA alkaline batteries are
installed as marked on the thermostat.
Temperature settings
do not change.
Check that the temperature settings are:
• Heating 40°F to 90°F(4.5°C to 32°C).
• Cooling 50°F to 99°F (10°C to 37°C).
Heating system does
not turn on.
• Set the system to Heat by pressing the
System key.
• Check the heat temperature setting to be
sure it is set above the room temperature
and “Heat On” shows solidly in the display.
• Check the circuit breaker to be sure it is
not tripped.
• Check power switch at heating and/or
cooling system to be sure it is on.
• Check the furnace door to be sure it is
closed securely.
• Wait five minutes for the heating system to
respond.
• If all of this was checked, contact your
local heating and cooling contractor.
Cooling system does
not turn on.
• Set the system to Cool by pressing the
System key.
• Check the cool temperature setting to be
sure it is set below the room temperature
and “Cool On” shows solidly in the display.
• Check the circuit breaker to be sure it is
not tripped.
• Check the power switch at the heating
and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is
closed securely.
• Wait five minutes for the cooling system to
respond.
• If all of this was checked, contact your
local heating and cooling contractor.