33-00066EFS—03 45
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 32).
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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