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Symptom
The system isn't turning on
LCD is blank, or displaying "LO BAT"
Thermostat does not turn on the system as
frequently as it should
Thermostat is not properly controlling the fan
Thermostat is continuously turning on and off
Temperature displayed is not accurate
Troubleshooting
Check the wiring (see Installation, Page 4)
Check the batteries
Replace batteries, or make sure the existing ones are properly installed
(see Installing and Changing Batteries, Page 6)
Decrease the temperature differential (see Setting a New Temperature
Differential, Page 7)
Check that the fan switch settings match your system (gas or electric)
Increase the temperature differential (see Setting a New Temperature
Differential, Page 7)
Your thermostat has two options for temperature readout: Fahrenheit
(default) or Celsius; check that the "jumper" is properly set to your
preference
Plug the hole for wiring behind the thermostat with non-flammable
insulation to prevent airflow into the thermostat
Remedy
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