Page 29
Troubleshooting Tips
If... Then...
Key to the right
of the screen
key is blank.
MORE key remains blank unless the Furnace
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
settings 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.
¯ Press the SYSTEM key to set to heat.
¯ Check the heat temperature setting to be
sure it is set above the room temperature and
Heat On" is displayed solidly on the screen.
¯ Make sure circuit breaker 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 techni-
cian.
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