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E474

E474 - Inverter IPM Heat Sink sensor error (Short or Open)

Samsung · Air Conditioning

What does E474 mean?

The heat sink sensor for IPM (Intelligent Power Module) inverter 1 has a short or open circuit, which can lead to overheating if not addressed.

Common Causes

  • IPM Heat Sink sensor (Short or Open).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit's power.

  2. 2

    Check the connections of the IPM Heat Sink sensor.

  3. 3

    The outdoor inverter PBA may need inspection if the issue persists.

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 63)Search more codes in this manual