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39 69-2736EFS—05
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display 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.
Cool On or Heat
On is flashing
on the screen
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
Heating or
cooling system
does not
respond
• Press System to set system to Heat. Make sure the temperature is set higher
than the Inside temperature.
• Press System to set system to Cool. Make sure the temperature is set lower
than the Inside temperature.
• Wait 5 minutes for the system to respond.