Navien · Tankless Water Heater Minor

E760 — Flushing/Service Reminder

A scheduled maintenance reminder telling you to have your installer flush and service the unit — most commonly to descale the heat exchanger on Navien's recommended interval. This is not a leak sensor or a shutdown for water damage; the unit is not reporting a leak.

Keep using it?
Yes — fix when convenient
DIY difficulty
Moderate
Verified against
navieninc.com ↗

How to fix it

  1. Confirm no other water heater codes or an actual visible leak are present — E760 by itself is a service reminder, not a leak alarm.
  2. Contact your installer or a licensed plumbing/gas technician to schedule the recommended flush and service.
  3. The technician will typically descale the heat exchanger with a flushing solution through the service valves and reset the maintenance counter, which clears E760.
  4. This isn't a DIY task — it requires the unit's isolation valves, a flush pump, and familiarity with the gas/venting setup — leave it to a qualified installer.

Why it happens

Typical signs: E760 on display, typically after the unit has logged a set number of operating hours or a time interval since last service · Unit continues to heat water normally otherwise · No water, dripping, or pooling visible around the unit

  • Scheduled flush/service interval reached Navien's control tracks runtime or elapsed time and alerts once the recommended descale/service window arrives.

More Navien tankless water heater codes

E003 E003 — Ignition Failure E012 E012 — Flame Loss E016 E016 — Overheat / High-Limit Trip E027 Tankless E027 — Sensor Abnormality E030 E030 — Abnormal Exhaust Temperature (Flue Overheat) E046 E046 — Abnormality in Limit Control (Heat-Exchanger High-Limit)

All Navien codes → All tankless water heater codes →

Frequently asked questions

What does the E760 code mean on a Navien tankless water heater?

A scheduled maintenance reminder telling you to have your installer flush and service the unit — most commonly to descale the heat exchanger on Navien's recommended interval. This is not a leak sensor or a shutdown for water damage; the unit is not reporting a leak.

What causes the E760 code on a Navien tankless water heater?

Scheduled flush/service interval reached: Navien's control tracks runtime or elapsed time and alerts once the recommended descale/service window arrives.

Is it safe to keep using a Navien tankless water heater with a E760 error?

Yes — fix when convenient. This is rated a minor-severity fault.

How do I fix E760 on a Navien tankless water heater?

Confirm no other water heater codes or an actual visible leak are present — E760 by itself is a service reminder, not a leak alarm. Contact your installer or a licensed plumbing/gas technician to schedule the recommended flush and service. The technician will typically descale the heat exchanger with a flushing solution through the service valves and reset the maintenance counter, which clears E760.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: navieninc.com.