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Troubleshooting
Symptom Remedy
The system is not turning on Check the wiring (see Installation, Page 4)
LCD is blank Check the wiring (see Installation, Page 4)
Thermostat is not properly controlling the fan Check that the Gas/Electric switch setting matches your system (gas
or electric)
Thermostat is continuously turning on and off Increase the temperature differential (see Setting a New Temperature
Differential, Page 7)
Temperature display is not accurate 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
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