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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:
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" is displayed solidly on the
screen.
Check the circuit breaker to make sure it
is not tripped.
Check the power switch at the heating
and/or cooling system to make sure it is on.
Check the furnace door to make sure it
is closed securely.
Wait five minutes for the heating system
to respond.
If the problem has not been identified
and corrected, contact a qualified service
technician.
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