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Navien Navien NCB-H Series E110: Abnormal air pressure or exhaust blockage Troubleshooting · NavienNavien NCB-H Series E110: Abnormal air pressure or exhaust blockageTroubleshooting code E110 Navien Navien NCB-H Series E205: Heating supply temperature sensor Troubleshooting · NavienNavien NCB-H Series E205: Heating supply temperature sensorTroubleshooting code E205 Navien Navien NCB-H Series E218: Heating return temperature sensor Troubleshooting · NavienNavien NCB-H Series E218: Heating return temperature sensorTroubleshooting code E218 Navien Navien NCB-H Series E278: External supply sensor not detected Troubleshooting · NavienNavien NCB-H Series E278: External supply sensor not detectedTroubleshooting code E278 Navien Navien NCB-H Series E279: External return sensor not detected Troubleshooting · NavienNavien NCB-H Series E279: External return sensor not detectedTroubleshooting code E279 Navien Navien NCB-H Series E351: Abnormal auto feeder valve Troubleshooting · NavienNavien NCB-H Series E351: Abnormal auto feeder valveTroubleshooting code E351 Navien Navien NCB-H Series E352: High water pressure Troubleshooting · NavienNavien NCB-H Series E352: High water pressureTroubleshooting code E352 Navien Navien NCB-H Series E353: Water pressure sensor issue Troubleshooting · NavienNavien NCB-H Series E353: Water pressure sensor issueTroubleshooting code E353 Navien Navien NCB-H Series E407: Domestic hot water outlet thermistor open or short Troubleshooting · NavienNavien NCB-H Series E407: Domestic hot water outlet thermistor open or shortTroubleshooting code E407 Navien Navien NCB-H Series E421: Cold water inlet thermistor open or short Troubleshooting · NavienNavien NCB-H Series E421: Cold water inlet thermistor open or shortTroubleshooting code E421 Navien Navien NCB-H Series E434: Abnormal operation: water adjustment valve Troubleshooting · NavienNavien NCB-H Series E434: Abnormal operation: water adjustment valveTroubleshooting code E434 Navien Navien NCB-H Series E439: Abnormal operation: flow sensor or no domestic water flow detected Troubleshooting · NavienNavien NCB-H Series E439: Abnormal operation: flow sensor or no domestic water flow detectedTroubleshooting code E439