AskManual.ai
⚠
warning Navien

Error Code LED blinks 3 times

Overheating detected — internal temperature too high.

? What Causes This

Blocked ventilation or fan failure.

✓ How to Fix It

  1. Turn off the unit and let it cool.
  2. Clear any obstructions around vents.
  3. If persists, contact service.

This error code appears in:

Navien Npe 240a2