E012 🟡 Repair Required
Navien Error Code E012: Flame Loss
⚠️ Your Navien boiler has experienced a flame loss, which could lead to system damage if not addressed promptly. It's safe to troubleshoot, but call a professional if needed.
How to Fix Navien Code E012
- Check if the reset button (if present) has tripped. Press it once to reset the boiler.
- Ensure the boiler's power switch is ON and the boiler is in heating mode.
- Inspect the gas supply valve to ensure it's open and gas is flowing.
What Does Navien Error Code E012 Mean?
The E012 error on your Navien boiler indicates a flame loss issue. This could be due to a problem with the ignition system, a blockage in the combustion chamber, or an issue with the gas valve. The boiler will display this error and shut down to prevent further damage. While it's safe to check a few things, do not attempt to open the boiler or tamper with gas lines.
Common Causes of Navien Code E012
- Faulty ignition system (spark electrode or igniter)
- Obstruction in the combustion chamber
- Problem with the gas valve or gas supply
- Incorrect flame sensor readings
Applicable Navien Models
Source Documentation
This error code is documented in 6 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonFlame Loss
ActionCheck gas, venting and condensate trap.
Navien NCB-H Installation & Operation ManualPage 129
ReasonFlame Loss
Action● Clean the intake air filter. ● Ensure that the electrical cord is properly grounded.
Navien NFB-H Installation & Operation ManualPage 116
ReasonFlame Loss
ActionCheck gas, venting and condensate trap.
Navien NFC-H Installation & Operation ManualPage 127
ReasonFlame loss
ActionManual RESET
Navien NHB-H Installation & Operation ManualPage 119
ReasonFlame Loss
ActionCheck gas, venting and condensate trap.
Navien NPF Installation & Operation ManualPage 125
ReasonFlame loss during combustion
ActionThis error occurs when the flame detector does not operate properly. ● Check if the supply and exhaust pipes connected to the furnace are installed properly. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794.
Need a Pro to Fix Navien Code E012?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Navien Tankless Water Heater Code E012
Igniter OEM: 400-00014-00
Gas Valve OEM: 400-00018-00
Flame Sensor OEM: 400-00015-00