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Troubleshooting Tips
If . . . Then . . .
Display is
blank.
Check that fresh AA 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 button.
• 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 button.
• 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.