Navien NPE-2 Code E760
Flushing / service alarm. Not a fault. E760 is Navien's service reminder: the heater has reached the point where it wants flushing and servicing. Navien's own instruction is to contact the installer to perform routine service. Left alone, what follows is not a nagging light — it is the overheat and exhaust-temperature codes that scale eventually causes.
DIY fixThe verdict
Descale the unit
Book or do a descale. Nothing has failed yet, which is exactly why this is the cheapest moment to act. A flush costs supplies and an hour if you have the valve kit; a plumber's flush is typically $150-300. Ignoring it is how units arrive at E016 and E030.
Typical cost: $25–$300
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the NPE-2 — not averaged across the brand.
Source: Navien NPE-2 User's Information Manual (p. 18), read Aug 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
- Flush the heat exchanger — see our descaling guide, and use the procedure in your own Navien manual for the valve sequence.
- Clean the cold water inlet filter while the unit is drained; on A2 models there is a recirculation inlet filter as well.
- If your water is hard, ask about treatment. Flushing treats the symptom; water quality is the cause.
Frequently asked questions
Can I just clear it and carry on?
You can silence a reminder. You cannot silence the scale it is reminding you about — and Navien's warranty excludes damage caused by hard water deposits and lime or mineral build-up.
How often should an NPE-2 be flushed?
Once a year is the usual baseline, more often on hard water. The reminder is time-based, so it is a floor, not a diagnosis: if your water is hard, flush before it asks.
Code E760 on other Navien series
Other Navien series report code E760 under the same fault name, but each manual is transcribed separately and they do not read alike: