LG Washer - AC / AE Error Code

The washer detected a communication error between control boards.

Meaning

The washer detected a communication error between control boards.

The LG AC/AE error code indicates a communication failure between the main control board and the motor control unit or Wi‑Fi module. This error appears on newer North American LG ThinQ front‑load washers.

Symptoms

  • Washer stops mid‑cycle
  • ThinQ disconnects
  • Buttons unresponsive

Causes

  • Loose wiring harness
  • Faulty main PCB
  • Faulty motor control board
  • Wi‑Fi module communication failure
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Step-by-Step Fixes

  • Power cycle washer.
  • Inspect wiring harnesses.
  • Reseat connectors.
  • Replace PCB if needed.
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Safety Notes

  • Unplug washer before servicing.
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Applicable Models

Show Models
  • map[front-load direct-drive (ac/ae-capable models):[WM3700HWA WM3800HBA WM3900HWA WM4000HWA WM4200HWA WM4500HBA WM5000HVA WM5500HVA]]
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Related Pages

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Other LG Washer Error Codes

Show All Error Codes

Model-Specific Notes

- AE6 is a Wi‑Fi module variant. - AC/AE often appears after power surges.

Disclaimer

The information provided on this page is for educational and informational purposes only. Repairs involve electrical, mechanical, and water-related risks. Always follow manufacturer instructions and consider contacting a qualified technician for diagnosis or repair.

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