Navien E760 Error Code: Flushing/service alarm
Updated October 2026 · Sourced from Navien documentation
✅ Usually fine to keep running
This is a service reminder. The manual says to contact the installer to perform routine service.
Is it safe to keep running? Usually yes. Schedule routine service (flushing) with your installer or a licensed technician.
E760 at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| E760 Error code shown on the front panel display | Flushing/service alarm | NPE-180A2, NPE-210A2, NPE-240A2, NPE-180S2, NPE-210S2, NPE-240S2 condensing tankless water heaters |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Note when the code appeared so you can tell the installer.
🛑 Stop and call a licensed pro if
- Schedule routine service (flushing) with your installer or a licensed technician.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Codes for flame failure, overheating, venting or the control board that return after one reset.
- Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Navien code
- Write down the exact code shown on the controller or the number of status light flashes.
- Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
- Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
- Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
- Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).
Source: Navien NPE Condensing Water Heaters User's Information Manual (NPE-2, rev 201202), 5.2 Understanding Error Codes, p.18. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Ryan Giles · Red Seal Certified Plumber · Ask a plumber · Ask an HVAC technician
Related Navien codes
E003 : Ignition failureE004 : False flame detectionE012 : Flame lossE016 : Overheating of heat exchangerE030 : Exhaust overheatingE031 : Overheating of burnerE046 : Limit control abnormal operationE047 : Exhaust thermostat thermistor open or short circuitE060 : Dual venturi abnormal operationE109 : Fan motor abnormal operationE110 : Abnormal air pressureE407 : Hot water outlet thermistor open or short circuit