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Navien Navien NFB700-500C E594 Troubleshooting · NavienNavien NFB700-500C E594Abnormal operation: EEPROM Navien Navien NFB700-1000C E353 Troubleshooting · NavienNavien NFB700-1000C E353Water pressure sensor issue Navien Navien NFB700-800C E480 Troubleshooting · NavienNavien NFB700-800C E480Domestic hot water tank temperature sensor not detected Navien Navien NFB700-600C E003 Troubleshooting · NavienNavien NFB700-600C E003Ignition failure Navien Navien NFB700-600C E782 Troubleshooting · NavienNavien NFB700-600C E782Abnormal operation: front/main panel communication Navien Navien NFB700-500C E777 Troubleshooting · NavienNavien NFB700-500C E777Low water cutoff activated Navien Navien NFB700-800C E278 Troubleshooting · NavienNavien NFB700-800C E278External supply sensor not detected Navien Navien NFB700-800C E016 Troubleshooting · NavienNavien NFB700-800C E016Heat exchanger overheat Navien Navien NFB700-600C E205 Troubleshooting · NavienNavien NFB700-600C E205Heating supply temperature sensor Navien Navien NFB700-800C E031 Troubleshooting · NavienNavien NFB700-800C E031Burner overheat Navien Navien NFB700-500C E765 Troubleshooting · NavienNavien NFB700-500C E765Abnormal external pump operation Navien Navien NFB700-800C E046 Troubleshooting · NavienNavien NFB700-800C E046Abnormal operation: heat exchanger limit or thermistor