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E404

E404 - System stopped due to overload protection

Samsung · Air Conditioning

What does E404 mean?

The system has shut down to protect components from overload, often occurring when the compressor starts or due to other operational stresses.

Common Causes

  • Overload protection control activation.
  • Compressor startup issues.
  • Fan and motor operation issues.
  • Indoor unit heat exchanger sensor or inlet blockage.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit's power, wait a few minutes, then restart.

  2. 2

    Check for any obstructions around the outdoor unit that might restrict airflow.

  3. 3

    Verify whether the fan and motor operate normally.

  4. 4

    Check the indoor unit heat exchanger temperature sensor and for inlet blockage.

Browse all codes in this manual (137)
Verified technical data. Last updated: April 2026

Related Faults

Abnormal displayAbnormal outdoor LED display - Error modeAll LEDs offAll outdoor unit LEDs off - No powerC101/C102C101 or C102 - Indoor to outdoor communication error
Source: Samsung Air Conditioning
Open Manual (Page 62)Search more codes in this manual