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Navien Navien NFB700-1000C E046 Troubleshooting · NavienNavien NFB700-1000C E046Abnormal operation: heat exchanger limit or thermistor Navien Navien NFB700-800C E740 Troubleshooting · NavienNavien NFB700-800C E740Abnormal operation: outdoor temperature sensor Navien Navien NFB700-1000C E736 Troubleshooting · NavienNavien NFB700-1000C E736Abnormal operation: cascade communication Navien Navien NFB700-1000C E047 Troubleshooting · NavienNavien NFB700-1000C E047Exhaust thermostat or thermistor open/short Navien Navien NFB700-500C E480 Troubleshooting · NavienNavien NFB700-500C E480Domestic hot water tank temperature sensor not detected Navien Navien NFB700-1000C E218 Troubleshooting · NavienNavien NFB700-1000C E218Heating return temperature sensor Navien Navien NFB700-600C E046 Troubleshooting · NavienNavien NFB700-600C E046Abnormal operation: heat exchanger limit or thermistor Navien Navien NFB700-600C E004 Troubleshooting · NavienNavien NFB700-600C E004False flame detection Navien Navien NFB700-1000C E594 Troubleshooting · NavienNavien NFB700-1000C E594Abnormal operation: EEPROM Navien Navien NFB700-600C E279 Troubleshooting · NavienNavien NFB700-600C E279External return sensor not detected Navien Navien NFB700-600C E109 Troubleshooting · NavienNavien NFB700-600C E109Abnormal operation: fan motor Navien Navien NFB700-1000C E765 Troubleshooting · NavienNavien NFB700-1000C E765Abnormal external pump operation