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Troubleshooting Tips
If . . . Then . . .
Key to the right of
the screen key is
blank.
MORE key remains blank unless the Fur-
nace Filter Change Reminder has been
turned on. See User Set−Up Number 0500.
Display is blank. Check that fresh AAA alkaline batteries are
installed as marked on the thermostat.
Temperature set-
tings do not change.
Check that temperature settings are:
D Heating 40°F to 90°F (4.5°C to 32°C).
D Cooling 50°F to 99°F (10°C to 37°C).
Heating system
does not turn on.
D Set the system to heat by pressing the
SYSTEM key.
D Check the heat temperature setting to be
sure it is set above the room temperature
and Heat On" is displayed solidly on the
screen.
D Check the circuit breaker to make sure it
is not tripped.
D Check the power switch at the heating
and/or cooling system to make sure it is on.
D Check the furnace door to make sure it
is closed securely.
D Wait five minutes for the heating system
to respond.
D If the problem has not been identified
and corrected, contact a qualified service
technician.