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Navien Navien NFB700-C Series E279: External return sensor not detected Troubleshooting · NavienNavien NFB700-C Series E279: External return sensor not detectedTroubleshooting code E279 Navien Navien NFB700-C Series E353: Water pressure sensor issue Troubleshooting · NavienNavien NFB700-C Series E353: Water pressure sensor issueTroubleshooting code E353 Navien Navien NFB700-C Series E480: Domestic hot water tank temperature sensor not detected Troubleshooting · NavienNavien NFB700-C Series E480: Domestic hot water tank temperature sensor not detectedTroubleshooting code E480 Navien Navien NFB700-C Series E740: Abnormal operation: outdoor temperature sensor Troubleshooting · NavienNavien NFB700-C Series E740: Abnormal operation: outdoor temperature sensorTroubleshooting code E740 Navien Navien NWP500 Series E407: Hot water outlet temperature sensor issue Troubleshooting · NavienNavien NWP500 Series E407: Hot water outlet temperature sensor issueTroubleshooting code E407 Navien Navien NWP500 Series E480: Tank temperature sensor issue Troubleshooting · NavienNavien NWP500 Series E480: Tank temperature sensor issueTroubleshooting code E480 Navien Navien NWP500 Series E481: Lower tank temperature sensor issue Troubleshooting · NavienNavien NWP500 Series E481: Lower tank temperature sensor issueTroubleshooting code E481 Navien Navien NWP500 Series E743: Abnormal temperature sensor or system control operation Troubleshooting · NavienNavien NWP500 Series E743: Abnormal temperature sensor or system control operationTroubleshooting code E743 Navien Navien NWP500 Series E901: Abnormal sensor or control operation Troubleshooting · NavienNavien NWP500 Series E901: Abnormal sensor or control operationTroubleshooting code E901 Navien Navien NWP500 Series E907: Abnormal sensor or control operation Troubleshooting · NavienNavien NWP500 Series E907: Abnormal sensor or control operationTroubleshooting code E907 Navien Navien NWP500 Series E908: Abnormal sensor or control operation Troubleshooting · NavienNavien NWP500 Series E908: Abnormal sensor or control operationTroubleshooting code E908 Navien Navien NWP500 Series E909: Abnormal sensor or control operation Troubleshooting · NavienNavien NWP500 Series E909: Abnormal sensor or control operationTroubleshooting code E909