Navien tankless water heater code E760
Flushing / service alarm. Code E760 means the same thing on all 2 Navien series documented here — but the fix, and what it costs, is still worth reading for your exact unit.
What code E760 means on each Navien series
| Series | What it means | Verdict | Typical cost |
|---|---|---|---|
| NPE-2 | Flushing / service alarm | DIY fix | $25–$300 |
| NPE-A / NPE-S | Flushing / service alarm | DIY fix | $25–$300 |
Each row opens the full page for that generation. We hold manuals for NPE-2 and NPE-A / NPE-S, and each one gets its own reading of code E760 — what Navien documents, what you can safely check yourself, and what the repair should cost.
What each manual actually says
The table above compares 2 series in four columns, which is enough to route you and not enough to explain anything. This is the Navien wording behind each row, one entry per manual, so you can see where the 2 readings of code E760 agree and where they part company.
NPE-2 — 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.
NPE-A / NPE-S — Flushing / service alarm
Not a fault. It is Navien's scheduled service reminder telling you the heater is due a flush. The manual's instruction is to contact the installer to perform routine service — but flushing a tankless heater is a job many owners do themselves with a pump and citric acid.
Does it matter which Navien you have?
NPE-2 and NPE-A / NPE-S all route code E760 the same way: a descale, at $25–$300. That makes it one of the Navien numbers you can act on before working out which unit you own.
Which Navien do you have?
On the 2 series that report code E760, the model number on the rating label starts NPE — match yours against the 13 listed below. You can also use the full model-number decoder.
Where this comes from
Source: Navien NPE-2 User's Information Manual (p. 18), read Aug 2026 — the manufacturer's own documentation for this Navien range.
Source: Navien NPE Operation Manual (NPE-A / NPE-S) (p. 16), read Aug 2026 — the manufacturer's own documentation for this Navien range.
Parts, guides and symptoms behind code E760
Code E760 on these 2 Navien series points at 4 guides, 2 parts and 2 symptoms, each named by the manufacturer's own procedure for this code.