E016 🟡 Repair Required
Navien Error Code E016: Overheating
⚠️ Your Navien boiler is overheating, which could lead to system damage. Turn it off and call a professional.
How to Fix Navien Code E016
- Turn off your boiler at the main power switch
- Check if the water flow rate is normal
- If water flow is normal, call a professional HVAC technician
What Does Navien Error Code E016 Mean?
The E016 error on your Navien boiler indicates that the water temperature has exceeded the safe limit. This could be due to a variety of issues, such as a faulty temperature sensor, a problem with the boiler's control board, or an issue with the water flow rate. It's important to address this issue promptly to prevent further damage to your boiler.
Common Causes of Navien Code E016
- Faulty temperature sensor
- Issue with the boiler's control board
- Problem with the water flow rate
- Air in the system
Applicable Navien Models
Source Documentation
This error code is documented in 6 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonHeat Exchanger Overheat
ActionCheck flow, clean system filters.
Navien NCB-H Installation & Operation ManualPage 129
ReasonHeat Exchanger Overheat
Action● Turn off the system for at least 30 minutes, and then restart it. ● Flush the heat exchanger.
Navien NFB-H Installation & Operation ManualPage 116
ReasonHeat Exchanger Overheat
ActionCheck flow, clean system filters.
Navien NFC-H Installation & Operation ManualPage 127
ReasonOverheating of heat exchanger
ActionManual RESET
Navien NHB-H Installation & Operation ManualPage 119
ReasonHeat Exchanger Overheat
ActionCheck flow, clean system filters.
Navien NPF Installation & Operation ManualPage 125
ReasonOverheating of the heat exchanger
ActionThis error occurs when the overheat controller on the heat exchanger is initiated during combustion due to the heat changer overheating. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794.
Need a Pro to Fix Navien Code E016?
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 E016
Temperature Sensor OEM: NAVIEN-0000001234
Control Board OEM: NAVIEN-0000005678