Navien Tankless Water Heater Error Codes
57 diagnostic codes, 15 model families documented.
Official site
Model Families
| Family | Name | Fuel | Models |
| NBP | NBP-180E, NBP-210E, NBP-240E | gas | 1 |
| NCB | NCB-210A | gas | 19 |
| NCB-H | Navien NCB-H Combi Boiler | gas | 1 |
| NFB-H | Navien NFB-H Boiler | gas | 1 |
| NFC | NFC-200 | gas | 4 |
| NFC-H | Navien NFC-H Combi Boiler | gas | 1 |
| NHB | NHB-110H | gas | 9 |
| NHB-H | Navien NHB-H Boiler | gas | 1 |
| NHW-A | Navien NHW-A Heat Pump Water Heater | electric | 1 |
| NPB | NPB-199, NPB-240, NPB-299 | gas | 1 |
| NPE | NPE-199E | gas | 28 |
| NPE-A2 | Navien NPE-A2 Tankless Water Heater | gas | 1 |
| NPE-S | NPE-S150E, NPE-S199E, NPE-S240E | gas | 1 |
| NPF | NPF-300A | gas | 2 |
| NPN | NPN-210U | gas | 2 |
Technical Manuals
| Manual | Type | Pages | Download |
| NFB-H Installation & Operation Manual | installation operation | 137 | PDF |
| Navien NCB-H Installation & Operation Manual | installation operation | 154 | PDF |
| Navien NFB-H Installation & Operation Manual | installation operation | 137 | PDF |
| Navien NFC-H Installation & Operation Manual | installation operation | 151 | PDF |
| Navien NHB-H Installation & Operation Manual | installation operation | 143 | PDF |
| Navien NHW-A Installation & Operation Manual | installation operation | 101 | PDF |
| Navien NPE-A2/S2 Installation & Operation Manual | installation operation | 145 | PDF |
| Navien NPF Installation & Operation Manual | installation operation | 183 | PDF |
| Navien NPN Installation & Operation Manual | installation operation | 80 | PDF |