Navien Recirculation Performance Issue

Hot water takes a very long time to reach fixtures even though the Navien has a built-in or external recirculation system.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Recirculation mode disabled in settings, Recirculation pump not running, Check valve installed backwards, Timer or sensor settings incorrect

How to Fix / Troubleshooting

Safety: Turn OFF power before changing wiring; menu changes can be done with power ON.

Steps:

  • 1. Verify recirculation settings: Use the Navien control panel to confirm that recirculation mode is enabled and that any timers are set correctly for your usage pattern.
  • 2. Check pump operation: Listen for the internal or external recirculation pump running when recirculation should be active. If silent, check power and wiring to the pump.
  • 3. Inspect check valves: Ensure check valves in the recirculation loop are oriented correctly (arrow in direction of flow) and not stuck closed.
  • 4. Confirm plumbing configuration: Verify that the recirculation return line is connected to the correct port on the Navien and that any crossover valves at fixtures are installed per Navien instructions.

If recirculation still performs poorly, a technician should measure flow and verify pump sizing and piping layout.

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Repair Difficulty

Medium 3/5

Required Part

Internal Circulation Pump
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