Navien E012: Flame loss
E012 is listed as 'Flame loss.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Error Codes
Browse published fault-code records by brand, product and displayed code.
Each record starts with the source meaning, then separates applicability, owner-safe actions, operating uncertainty and qualified-service boundaries. A matching code string alone is not enough: confirm the brand, product, model and controller before acting.
Navien E016: Heat exchanger overheat
E016 is listed as 'Heat exchanger overheat.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E030: Abnormal operation: exhaust temperature
E030 is listed as 'Abnormal operation: exhaust temperature.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E031: Burner overheating
E031 is listed as 'Burner overheating.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E046: Abnormal operation: heat exchanger overheating sensor
E046 is listed as 'Abnormal operation: heat exchanger overheating sensor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E047: Abnormal operation: exhaust thermostat
E047 is listed as 'Abnormal operation: exhaust thermostat.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E060: Abnormal operation: dual venturi
E060 is listed as 'Abnormal operation: dual venturi.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E109: Abnormal operation: fan motor
E109 is listed as 'Abnormal operation: fan motor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E110: Exhaust vent closed
E110 is listed as 'Exhaust vent closed.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E127: Abnormal operation: APS
E127 is listed as 'Abnormal operation: APS.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E205: Abnormal operation: heating supply thermistor
E205 is listed as 'Abnormal operation: heating supply thermistor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E218: Abnormal operation: heating return thermistor
E218 is listed as 'Abnormal operation: heating return thermistor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E278: Abnormal operation: system supply thermistor
E278 is listed as 'Abnormal operation: system supply thermistor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E279: Abnormal operation: system return thermistor
E279 is listed as 'Abnormal operation: system return thermistor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E291: Supply/Return inversion limit
E291 is listed as 'Supply/Return inversion limit.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E302: Low water pressure
E302 is listed as 'Low water pressure.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E352: High water pressure
E352 is listed as 'High water pressure.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E353: Abnormal operation: water pressure sensor
E353 is listed as 'Abnormal operation: water pressure sensor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E480: Abnormal operation: DHW tank temperature sensor
E480 is listed as 'Abnormal operation: DHW tank temperature sensor.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E515: Abnormal operation: PCB component
E515 is listed as 'Abnormal operation: PCB component.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E517: Abnormal operation: DIP switch setting (PCB)
E517 is listed as 'Abnormal operation: DIP switch setting (PCB).' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E594: Abnormal operation: EEPROM (PCB)
E594 is listed as 'Abnormal operation: EEPROM (PCB).' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E615: Abnormal operation: MCU
E615 is listed as 'Abnormal operation: MCU.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01Navien E736: Abnormal operation: Cascade communication
E736 is listed as 'Abnormal operation: Cascade communication.' for Navien Condensing Boiler. Verify the exact model and controller before acting.
Source checked 2026-05-01