Navien E760 Error Code

What does Navien E760 mean?

E760 is a maintenance reminder alarm, not a failure code. It appears when the unit's internal service timer reaches the configured interval, signaling that the heat exchanger is due for descaling and the system requires a routine maintenance inspection. The unit continues to operate when E760 is active, but ignoring it leads to progressive scale buildup that can eventually trigger genuine fault codes like E016 or E030.

Symptoms

• E760 displayed on the front panel; unit still produces hot water normally.
• Alarm persists through normal power cycles until a technician resets the service timer.
• Reduced hot water output or longer time to reach target temperature may accompany long-overdue service.
• Alarm may appear annually or at the installer-configured service interval.

Common causes

• Internal service interval counter has reached the configured maintenance threshold.
• Heat exchanger has not been descaled at the recommended annual service interval.
• Installer-configured service timer was set to a shorter interval at commissioning.
• Scale accumulation in hard-water areas causes the alarm to trip sooner than expected.

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Diagnostic steps

1. Contact the installer or a licensed technician for scheduled service

   E760 is a service reminder intended for qualified technicians. Do not attempt to reset the alarm without performing the underlying maintenance — the alarm will return at the next interval and the heat exchanger will continue to scale.

2. Perform heat exchanger descaling

   Connect a descaling pump to the service ports and circulate a diluted descaling solution (Navien-approved or food-grade equivalent) through the heat exchanger for the manufacturer-recommended duration. Flush with clean water after descaling is complete.

3. Inspect and clean the inlet water filter

   During the service visit, remove and clean the cold water inlet filter strainer. Check the mesh for tears and replace if damaged to prevent debris from entering the heat exchanger after descaling.

4. Inspect condensate drain and trap

   Clear the condensate trap of any crystallized scale deposits. Confirm the drain line flows freely to a suitable drain. A clogged condensate path can cause pressure faults between service intervals.

5. Reset the service alarm via the service menu

   After completing all maintenance tasks, navigate to the Navien service menu (access procedure in the installation manual) and reset the E760 service timer. Failure to reset the timer will leave the alarm active even after correct service.

When to call a professional

E760 is designed to be resolved by the original installer or a licensed HVAC technician. Descaling procedures, service menu access codes, and service timer reset require technician-level system access. In hard water areas, annual professional service prevents the heat exchanger damage that makes E016, E030, and pinhole leaks far more likely.