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09

Error 09 - Checksum Error / PCB defect

LG · Air Conditioning

What does 09 mean?

This indicates a checksum error, usually caused by a defective main PCB or issues with EEPROM connections.

Common Causes

  • Defective main PCB
  • Loose or faulty EEPROM connections on the main PCB

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for loose connections or dry joints where the EEPROM connects to the main PCB.

  2. 2

    Repair any identified connection issues.

  3. 3

    If the error persists, the main PCB may be defective and require replacement.

Browse all codes in this manual (97)
Verified technical data. Last updated: April 2026

Related Faults

01Error 01 - Indoor air sensor open or short circuit02Error 02 - Inlet pipe sensor open or short circuit03Error 03 - Communication error between indoor unit and wired remote
Source: LG Air Conditioning
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