Troubleshooting, Symptom remedy – Friedrich RT4 User Manual
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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 is set to 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