Navien Appliance Error Codes
Navien: 4 error codes with meaning, severity, likely causes and repair cost estimates.
4Codes
3.3Average severity
25%High or critical
0%DIY-friendly
Severity distribution
Most viewed
E003
Navien · Water Heater / Boiler
The heater sparked and opened its gas valve, but never saw a flame – often a closed valve or no…
Moderate
E012
Navien · Water Heater / Boiler
The burner lit, then lost its flame signal mid-cycle – think gas pressure, grounding or a dirty…
Moderate
E110
Navien · Water Heater / Boiler
The fan can't move enough air through the vent system – most often a clogged intake filter…
High
E351
Navien · Water Heater / Boiler
Navien combi boilers: the auto make-up water valve couldn't restore heating pressure within 5…
Moderate