Navien Error Code Reference — All 64 Codes

Complete Navien error code cheat sheet. All 64 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	Guide
Navien Alarm 415	Causes & Fix	Fix →
Navien Alarm 438	Causes & Fix	Fix →
Navien Control Board Replacement	Signs & How-To	Fix →
Navien E001 Error Code	Causes & Fix	Fix →
Navien E002 Error Code	Causes & Fix	Fix →
Navien E002 Error Code	Causes & Fix	Fix →
Navien E003 Error	Ignition Failure Causes & Fix	Fix →
Navien E004 Error Code	Causes & Fix	Fix →
Navien E005 Error Code	Causes & Fix	Fix →
Navien E006 Error Code	Causes & Fix	Fix →
Navien E006 Error Code	Causes & Fix	Fix →
Navien E007 Error Code	Causes & Fix	Fix →
Navien E008 Error Code	Causes & Fix	Fix →
Navien E009 Error Code	Causes & Fix	Fix →
Navien E009 Error Code	Causes & Fix	Fix →
Navien E010 Error Code	Causes & Fix	Fix →
Navien E011 Error Code	Causes & Fix	Fix →
Navien E012 Error Code	Causes & Fix	Fix →
Navien E016 Error Code	Causes & Fix	Fix →
Navien E021 Error Code	Causes & Fix	Fix →
Navien E027 Error Code	Causes & Fix	Fix →
Navien E029 Error Code	Causes & Fix	Fix →
Navien E030 Error Code	Causes & Fix	Fix →
Navien E030 Error Code	Causes & Fix	Fix →
Navien E038 Error Code	Causes & Fix	Fix →
Navien E109 Error	Causes & Fix	Fix →
Navien E110 Error Code	Causes & Fix	Fix →
Navien E110 Error Code	Causes & Fix	Fix →
Navien E302 Error Code	Causes & Fix	Fix →
Navien E515 Error Code	Causes & Fix	Fix →
Navien E594 Error Code	Causes & Fix	Fix →
Navien E615 Error Code	Causes & Fix	Fix →
Navien E740 Error Code	Causes & Fix	Fix →
Navien E777 Error Code	Causes & Fix	Fix →
Navien E782 Error Code	Causes & Fix	Fix →
Navien Error Code E001	No Ignition Fix	Fix →
Navien Error Code E003	Ignition Failure Fix	Fix →
Navien Error Code E004	Causes & Fix	Fix →
Navien Error Code E007	Causes & Fix	Fix →
Navien Error Code E010	Causes & Fix	Fix →
Navien Error Code E012	Flame Loss During Operation Fix	Fix →
Navien Error Code E013	Causes & Fix	Fix →
Navien Error Code E016	Causes & Fix	Fix →
Navien Error Code E021	Cold Water Inlet Thermistor Fault Fix	Fix →
Navien Error Code E022	Hot Water Outlet Thermistor Fault Fix	Fix →
Navien Error Code E024	Overheat / High Temperature Cutoff	Fix →
Navien Flame Rod Replacement	Signs & How-To	Fix →
Navien Flow Sensor Replacement	Signs & How-To	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-180S2 Problems & Error Codes	Ignition failure (E003) is the most common problem, usually caused by gas supply issues, dirty flame rod, or blocked venting.	Fix →
Navien NPE-240A2 Water Heater Problems & Error Codes	Ignition failure and flow sensor faults are the most common issues. Clean the intake air filter and check gas supply first.	Fix →
Navien NPE-A 016	Overheat Lockout Fix	Fix →
Navien NPE/NCB Code E003	Ignition Failure Fix	Fix →
Navien Tankless E013 Error Code	Causes & Fix	Fix →
Navien Tankless Heat Exchanger Replacement	Signs & How-To	Fix →
Navien Tankless Igniter/Flame Rod Replacement	Signs & How-To	Fix →
Navien Tankless Water Heater Error Codes	Complete Guide	Fix →
Navien Water Heater Leaking	Causes & Fix	Fix →
Navien Water Heater No Hot Water	Causes & Fix	Fix →
Navien Water Heater No Ignition	Causes & Fix	Fix →
Navien Water Heater Not Enough Hot Water	Causes & Fix	Fix →
Navien Water Heater Water Too Hot	Causes & Fix	Fix →

View all Navien guides →