E052
Navien Outlet Water Temperature Sensor Fault

Display shows E052; unit may overheat or behave erratically with outlet temperature.

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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

Open or shorted outlet thermistor, Loose or damaged wiring, Sensor not properly attached to outlet pipe, Defective outlet temperature sensor

How to Fix / Troubleshooting

Safety: Turn OFF power and allow the unit to cool before touching hot water lines.

Steps:

  • 1. Locate outlet sensor: Find the hot water outlet thermistor on the outlet pipe. Confirm it is firmly clipped or strapped to the pipe.
  • 2. Check wiring: Ensure the sensor connector is fully seated on the main PCB and that the cable is intact.
  • 3. Inspect for damage: Look for signs of overheating, cracking, or moisture around the sensor.

If E052 persists after reseating and inspection, the outlet thermistor should be replaced. Incorrect readings can cause unsafe temperatures, so use a qualified technician if unsure.

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Repair Difficulty

Medium 3/5

Required Part

Outlet Temperature Sensor (Thermistor)
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