Navien- Tankless Water Heater Error Codes
Manufacturer | Error Code | Description |
Navien- Link to Manual Models: – Tankless Water Heaters: CR / NR / NP / NPE / NPE‑A2 / NPE‑S2 / NPN‑U / NPN‑E – Combi-Boilers: CH / NCB / NCB‑H / NFC‑H – Boilers: NFB‑H / NHB / NFB‑C | ||
| Error Code E03 | Ignition Failure- Ensure that the main gas supply valve is open |
| Error Code E04 | False Flame Detection Ensure that the electrical cord is properly grounded |
| Error Code E12 | Flame Loss ● Clean the intake air filter ● Ensure that the electrical cord is properly grounded |
| Error Code E16 | Overheating of heat exchanger ● Turn off the system for at least 30 minutes, then restart it ● Clean the Heating Return filter ● Flush the Heat Exchanger |
| Error Code E30 | Abnormal exhaust temperature. Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E46 | Abnormal Operation: Limit Control Contact Technical Support at 1-800-519-8794 or a Licensed Navien Technician |
| Error Code E47 | Abnormal operation: Exhaust Thermostat Contact Technical Support at 1-800-519-8794 or a Licensed Navien Technician |
| Error Code E60 | Error Code E060: Abnormal Operation: Dual Venturi Contact Technical Support at 1-800-519-8794 or a Licensed Navien Technician |
| Error Code E109 | Abnormal Operation: Fan Motor ● Ensure that the exhaust pipe is free of obstructions ● Clean the intake air filter |
| Error Code E110 | Abnormal Air Pressure ● Ensure that the exhaust pipe is free of obstructions ● Clean the intake air filter |
| Error Code E205 | Heating supply thermistor open or short circuit Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E218 | Heating return thermistor open or short circuit Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E351 | Abnormal Auto feeder valve (make-up water) Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E352 | High water pressure Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E353 | Abnormal operation: water pressure sensor Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E407 | Hot water outlet thermistor open or short circuit Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E421 | Cold water inlet thermistor open or short circuit Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E439 | Abnormal operation: flow sensor Reset the boiler from the front panel. |
| Error Code E515 | Abnormal operation: PCB Ensure that the electrical cord is properly grounded. Reset the boiler from the front panel. |
| Error Code E517 | Abnormal operation: DIP switch setting Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E594 | Abnormal operation: EEPROM Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E615 | Abnormal operation: input and memory Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E736 | Abnormal operation: cascade communication Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
| Error Code E740 | Abnormal operation: outdoor temperature sensor (appears only when the outdoor reset curve is enabled). ● Ensure that the outdoor reset curve is configured properly. Check the outdoor temperature sensor wiring connection. |
| Error Code E777 | Abnormal operation: LWCO Check the LWCO wiring connection Ensure that the system water level is appropriate. Add make-up water to the system if necessary. |
| Error Code E782 | Abnormal operation: main panel communication Call or Text Blue Conservation’s trained Navien specialists at 484-469-0718. |
