Navien Condensing Boiler Error E480: Causes & Fixes
Abnormal operation: DHW tank temperature sensor.
Error Codes
Browse published troubleshooting notes by brand, product, and error code.
Navien Condensing Boiler Error E515: Causes & Fixes
Abnormal operation: PCB component.
Navien Condensing Boiler Error E517: Causes & Fixes
Abnormal operation: DIP switch setting (PCB).
Navien Condensing Boiler Error E302: Causes & Fixes
Low water pressure.
Navien Condensing Boiler Error E352: Causes & Fixes
High water pressure.
Navien Condensing Boiler Error E353: Causes & Fixes
Abnormal operation: water pressure sensor.
Navien Condensing Boiler Error E278: Causes & Fixes
Abnormal operation: system supply thermistor.
Navien Condensing Boiler Error E279: Causes & Fixes
Abnormal operation: system return thermistor.
Navien Condensing Boiler Error E291: Causes & Fixes
Supply/Return inversion limit.
Navien Condensing Boiler Error E127: Causes & Fixes
Abnormal operation: APS.
Navien Condensing Boiler Error E205: Causes & Fixes
Abnormal operation: heating supply thermistor.
Navien Condensing Boiler Error E218: Causes & Fixes
Abnormal operation: heating return thermistor.
Navien Condensing Boiler Error E060: Causes & Fixes
Abnormal operation: dual venturi.
Navien Condensing Boiler Error E109: Causes & Fixes
Abnormal operation: fan motor.
Navien Condensing Boiler Error E110: Causes & Fixes
Exhaust vent closed.
Navien Condensing Boiler Error E031: Causes & Fixes
Burner overheating.
Navien Condensing Boiler Error E046: Causes & Fixes
Abnormal operation: heat exchanger overheating sensor.
Navien Condensing Boiler Error E047: Causes & Fixes
Abnormal operation: exhaust thermostat.
Navien Condensing Boiler Error E012: Causes & Fixes
Flame loss.
Navien Condensing Boiler Error E016: Causes & Fixes
Heat exchanger overheat.
Navien Condensing Boiler Error E030: Causes & Fixes
Abnormal operation: exhaust temperature.
Navien Condensing Boiler Error E001: Causes & Fixes
Heat exchanger over temperature.
Navien Condensing Boiler Error E003: Causes & Fixes
Ignition failure.
Navien Condensing Boiler Error E004: Causes & Fixes
False flame detection.