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Navien Navien NFB-H Series E615: Abnormal operation: input and memory Troubleshooting · NavienNavien NFB-H Series E615: Abnormal operation: input and memoryTroubleshooting code E615 Navien Navien NFB-H Series E736: Abnormal operation: cascade communication Troubleshooting · NavienNavien NFB-H Series E736: Abnormal operation: cascade communicationTroubleshooting code E736 Navien Navien NFB-H Series E740: Abnormal operation: outdoor temperature sensor Troubleshooting · NavienNavien NFB-H Series E740: Abnormal operation: outdoor temperature sensorTroubleshooting code E740 Navien Navien NFB-H Series E762: Vent pipe not properly inserted Troubleshooting · NavienNavien NFB-H Series E762: Vent pipe not properly insertedTroubleshooting code E762 Navien Navien NFB-H Series E777: Low water cutoff activated Troubleshooting · NavienNavien NFB-H Series E777: Low water cutoff activatedTroubleshooting code E777 Navien Navien NFB-H Series E782: Abnormal operation: front/main panel communication Troubleshooting · NavienNavien NFB-H Series E782: Abnormal operation: front/main panel communicationTroubleshooting code E782 Navien Navien NFB-H Series E784: Abnormal operation: zone controller communication Troubleshooting · NavienNavien NFB-H Series E784: Abnormal operation: zone controller communicationTroubleshooting code E784 Navien Navien NFB-H Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NFB-H Series E786: Improper front panel or panel connectionTroubleshooting code E786 Navien Navien NFB-H Series E788: Incorrect gas type setting Troubleshooting · NavienNavien NFB-H Series E788: Incorrect gas type settingTroubleshooting code E788 Navien Navien NHB-H Series E001: Heat exchanger overheat Troubleshooting · NavienNavien NHB-H Series E001: Heat exchanger overheatTroubleshooting code E001 Navien Navien NHB-H Series E003: Ignition failure Troubleshooting · NavienNavien NHB-H Series E003: Ignition failureTroubleshooting code E003 Navien Navien NHB-H Series E004: False flame detection Troubleshooting · NavienNavien NHB-H Series E004: False flame detectionTroubleshooting code E004