CodeRegistry
Brands
  1. Home
  2. Samsung
  3. Air Conditioning
  4. E203
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

E203

E203 - Outdoor inverter-main micom communication error

Samsung · Air Conditioning

What does E203 mean?

This indicates a communication problem between the outdoor unit's inverter Printed Circuit Board (PBA) and the main micom (microcontroller).

Common Causes

  • Electrical connection issues between indoor unit MAIN PBA - INVERTER PBA.
  • Incorrect settings.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit's power.

  2. 2

    Check the electrical connections between the indoor unit's main PBA and the inverter PBA.

  3. 3

    Verify all related settings and restart the unit.

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