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Navien Navien NFC-H Series E012: Flame loss Troubleshooting · NavienNavien NFC-H Series E012: Flame lossTroubleshooting code E012 Navien Navien NFC-H Series E016: Heat exchanger overheat Troubleshooting · NavienNavien NFC-H Series E016: Heat exchanger overheatTroubleshooting code E016 Navien Navien NFC-H Series E030: Exhaust overheat Troubleshooting · NavienNavien NFC-H Series E030: Exhaust overheatTroubleshooting code E030 Navien Navien NFC-H Series E031: Burner overheat Troubleshooting · NavienNavien NFC-H Series E031: Burner overheatTroubleshooting code E031 Navien Navien NFC-H Series E046: Abnormal operation: heat exchanger limit or thermistor Troubleshooting · NavienNavien NFC-H Series E046: Abnormal operation: heat exchanger limit or thermistorTroubleshooting code E046 Navien Navien NFC-H Series E047: Exhaust thermostat or thermistor open/short Troubleshooting · NavienNavien NFC-H Series E047: Exhaust thermostat or thermistor open/shortTroubleshooting code E047 Navien Navien NFC-H Series E060: Abnormal operation: dual venturi Troubleshooting · NavienNavien NFC-H Series E060: Abnormal operation: dual venturiTroubleshooting code E060 Navien Navien NFC-H Series E109: Abnormal operation: fan motor Troubleshooting · NavienNavien NFC-H Series E109: Abnormal operation: fan motorTroubleshooting code E109 Navien Navien NFC-H Series E110: Abnormal air pressure or exhaust blockage Troubleshooting · NavienNavien NFC-H Series E110: Abnormal air pressure or exhaust blockageTroubleshooting code E110 Navien Navien NFC-H Series E205: Heating supply temperature sensor Troubleshooting · NavienNavien NFC-H Series E205: Heating supply temperature sensorTroubleshooting code E205 Navien Navien NFC-H Series E218: Heating return temperature sensor Troubleshooting · NavienNavien NFC-H Series E218: Heating return temperature sensorTroubleshooting code E218 Navien Navien NFC-H Series E278: External supply sensor not detected Troubleshooting · NavienNavien NFC-H Series E278: External supply sensor not detectedTroubleshooting code E278