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33-00066EFS—05 21
Installer options
Installer options require a password and
should only be changed by a qualified
technician.
To prevent unintended changes or
damage to your equipment, do not
change these options yourself.
MCR33976
Installer Options
MCR33977
Enter password
0 0 0 0
MCR34100
Troubleshooting
If you have difficulty with your thermostat, try these suggestions. Most problems can
be corrected quickly and easily.
Screen is
blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating and cooling system is on.
• Make sure furnace door is closed securely.
Screen is
difficult to
read
• Change screen brightness using Preferences menu (see page 15).
Red light is on • If thermostat is in Emergency Heat mode, the red light is normal. It
shows that the thermostat is in Emergency Heat mode.
• If thermostat is not in Emergency Heat mode, an alert is active. Check
message on the thermostat screen.
Heating
or cooling
system does
not respond
• Touch SYSTEM to set system to Heat. Make sure the temperature is set
higher than the Inside temperature.
• Touch SYSTEM to set system to Cool. Make sure the temperature is set
lower than the Inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• If “Wait” is displayed, the compressor protection timer is on. Wait
5 minutes for the system to restart safely, without damaging the
compressor.
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