Navien Error Code Reference — All 7 Codes
Complete Navien error code cheat sheet. All 7 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Navien appliance is showing an error or fault code. Start with the exact code, then open the fix guide to find the real cause and the exact OEM part before you order parts or book a repair. Coverage spans washers, dryers, refrigerators, dishwashers, ranges, ovens and more.
Tip: search the exact appliance and code together, for example "Navien washer LE" or "Navien refrigerator 22E".
| Error Code | What It Means | Often a cheap fix? | Guide |
|---|---|---|---|
| Navien Error Code E003 | Ignition Failure Fix | — | Fix → |
| Navien NCB Combi Boiler Error Codes | Complete Fault Guide | — | Fix → |
| Navien NFC Combi Boiler Error Codes: Complete Guide | Navien NFC combi boiler error codes and fault diagnostics. E-series error codes, causes, and technician-level troubleshooting procedures. | — | Fix → |
| Navien NPE Series Error Codes | Tankless Water Heater Fault Guide | — | Fix → |
| Navien NPE-A 016 | Overheat Lockout Fix | — | Fix → |
| Navien NPE/NCB Code E003 | Ignition Failure Fix | — | Fix → |
| Navien Tankless Water Heater Error Codes | Complete Guide | — | Fix → |