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error Mitsubishi

Error Code E4

Outdoor temperature sensor error — the outdoor unit cannot accurately read outside temperature.

? What Causes This

Faulty outdoor temperature sensor, damaged wiring, or sensor connector malfunction.

✓ How to Fix It

  1. Turn off the system.
  2. Inspect the outdoor temperature sensor and its wiring for damage.
  3. Check all connectors are tight and secure.
  4. Restart the system.
  5. If error remains, the sensor may need replacement by a technician.

This error code appears in:

Mitsubishi Mini Split Air Conditioning System