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Navien Navien NPE-A2 Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NPE-A2 Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NPE-S2 Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NPE-S2 Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NPN-U Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NPN-U Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NPN-U Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NPN-U Series E786: Improper front panel or panel connectionTroubleshooting code E786 Navien Navien NPN-E Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NPN-E Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NPN-E Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NPN-E Series E786: Improper front panel or panel connectionTroubleshooting code E786 Navien Navien NCB-H Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NCB-H Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NCB-H Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NCB-H Series E786: Improper front panel or panel connectionTroubleshooting code E786 Navien Navien NFC-H Series E773: Improper gas type or gas connection detected Troubleshooting · NavienNavien NFC-H Series E773: Improper gas type or gas connection detectedTroubleshooting code E773 Navien Navien NFC-H Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NFC-H Series E786: Improper front panel or panel connectionTroubleshooting code E786 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 NHB-H Series E786: Improper front panel or panel connection Troubleshooting · NavienNavien NHB-H Series E786: Improper front panel or panel connectionTroubleshooting code E786