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Navien Navien NFB-200H E594 Troubleshooting · NavienNavien NFB-200H E594Abnormal operation: EEPROM Navien Navien NFB-301C E279 Troubleshooting · NavienNavien NFB-301C E279External return sensor not detected Navien Navien NFB-200H E016 Troubleshooting · NavienNavien NFB-200H E016Heat exchanger overheat Navien Navien NFB-399C E774 Troubleshooting · NavienNavien NFB-399C E774Manual reset limit Navien Navien NFB-301C E016 Troubleshooting · NavienNavien NFB-301C E016Heat exchanger overheat Navien Navien NFB-399C E279 Troubleshooting · NavienNavien NFB-399C E279External return sensor not detected Navien Navien NFB-175H E016 Troubleshooting · NavienNavien NFB-175H E016Heat exchanger overheat Navien Navien NFB-399C E517 Troubleshooting · NavienNavien NFB-399C E517Abnormal operation: DIP switch setting Navien Navien NFB-200H E777 Troubleshooting · NavienNavien NFB-200H E777Low water cutoff activated Navien Navien NFB-301C E777 Troubleshooting · NavienNavien NFB-301C E777Low water cutoff activated Navien Navien NFB-301C E353 Troubleshooting · NavienNavien NFB-301C E353Water pressure sensor issue Navien Navien NFB-200H E788 Troubleshooting · NavienNavien NFB-200H E788Incorrect gas type setting