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Navien Navien NFB-301C E352 Troubleshooting · NavienNavien NFB-301C E352High water pressure Navien Navien NFB-200H E001 Troubleshooting · NavienNavien NFB-200H E001Heat exchanger overheat Navien Navien NFB-399C E030 Troubleshooting · NavienNavien NFB-399C E030Exhaust overheat Navien Navien NFB-200H E218 Troubleshooting · NavienNavien NFB-200H E218Heating return temperature sensor Navien Navien NFB-175H E291 Troubleshooting · NavienNavien NFB-175H E291Return temperature exceeds supply temperature Navien Navien NFB-200H E003 Troubleshooting · NavienNavien NFB-200H E003Ignition failure Navien Navien NFB-399C E480 Troubleshooting · NavienNavien NFB-399C E480Domestic hot water tank temperature sensor not detected Navien Navien NFB-175H E480 Troubleshooting · NavienNavien NFB-175H E480Domestic hot water tank temperature sensor not detected Navien Navien NFB-301C E030 Troubleshooting · NavienNavien NFB-301C E030Exhaust overheat Navien Navien NFB-399C E782 Troubleshooting · NavienNavien NFB-399C E782Abnormal operation: front/main panel communication Navien Navien NFB-399C E278 Troubleshooting · NavienNavien NFB-399C E278External supply sensor not detected Navien Navien NFB-399C E594 Troubleshooting · NavienNavien NFB-399C E594Abnormal operation: EEPROM