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Navien Navien NFC-H Series E421: Cold water inlet thermistor open or short Troubleshooting · NavienNavien NFC-H Series E421: Cold water inlet thermistor open or shortTroubleshooting code E421 Navien Navien NFC-H Series E434: Abnormal operation: water adjustment valve Troubleshooting · NavienNavien NFC-H Series E434: Abnormal operation: water adjustment valveTroubleshooting code E434 Navien Navien NFC-H Series E439: Abnormal operation: flow sensor or no domestic water flow detected Troubleshooting · NavienNavien NFC-H Series E439: Abnormal operation: flow sensor or no domestic water flow detectedTroubleshooting code E439 Navien Navien NFC-H Series E441: Domestic hot water inlet/outlet 2 sensor open or short Troubleshooting · NavienNavien NFC-H Series E441: Domestic hot water inlet/outlet 2 sensor open or shortTroubleshooting code E441 Navien Navien NFC-H Series E445: Abnormal operation: bypass mixing valve Troubleshooting · NavienNavien NFC-H Series E445: Abnormal operation: bypass mixing valveTroubleshooting code E445 Navien Navien NFC-H Series E515: Abnormal operation: PCB Troubleshooting · NavienNavien NFC-H Series E515: Abnormal operation: PCBTroubleshooting code E515 Navien Navien NFC-H Series E517: Abnormal operation: DIP switch setting Troubleshooting · NavienNavien NFC-H Series E517: Abnormal operation: DIP switch settingTroubleshooting code E517 Navien Navien NFC-H Series E594: Abnormal operation: EEPROM Troubleshooting · NavienNavien NFC-H Series E594: Abnormal operation: EEPROMTroubleshooting code E594 Navien Navien NFC-H Series E615: Abnormal operation: input and memory Troubleshooting · NavienNavien NFC-H Series E615: Abnormal operation: input and memoryTroubleshooting code E615 Navien Navien NFC-H Series E736: Abnormal operation: cascade communication Troubleshooting · NavienNavien NFC-H Series E736: Abnormal operation: cascade communicationTroubleshooting code E736 Navien Navien NFC-H Series E740: Abnormal operation: outdoor temperature sensor Troubleshooting · NavienNavien NFC-H Series E740: Abnormal operation: outdoor temperature sensorTroubleshooting code E740 Navien Navien NFC-H Series E761: Pump aquastat not detected Troubleshooting · NavienNavien NFC-H Series E761: Pump aquastat not detectedTroubleshooting code E761