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Troubleshooting Tips
If... Then...
Cooling system
does not turn
on.
¯ Press SYSTEM key to set to Cool.
¯ Check the cool temperature setting to be
sure it is set below the room temperature and
Cool 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 cooling system to
respond.
¯ If the problem has not been identified and
corrected, contact a qualified service techni-
cian.
Cannot set Sys-
tem setting to
Cool.
Check Installer Set−Up Number 170: Heating
and/or Cooling Type*. Make sure the setting
matches the installed heating and/or cooling
system.
Heat On" is not
displayed on
the screen.
Set the System setting to Heat and set the
temperature setting above the room tempera-
ture. If Heat On" is shown solidly in the dis-
play, but the heating system does not turn on,
see Heating system does not turn on"
suggestions on the previous page.
table continued on next page