Lg Air Conditioner Error 29

⚡ Quick Answer: The LG air conditioner error code 29 indicates a communication failure between the indoor and outdoor units, often related to a DC compressor fault. T... ⚠️ Difficulty Varies

What Does Error 29 Mean?

The LG air conditioner error code 29 indicates a communication failure between the indoor and outdoor units, often related to a DC compressor fault. This can manifest as the unit failing to start cooling or heating, shutting off shortly after starting, or the outdoor unit not engaging the compressor while the indoor fan may still run intermittently. Common causes include issues with compressor position/speed detection or the compressor drawing excessive current.

Common Symptoms:

  • Air conditioner fails to start cooling or heating and displays CH29 on the remote or unit display.
  • Unit may shut off shortly after starting or fail to run.
  • Outdoor unit may not engage compressor while indoor fan may still run intermittently.

Possible Causes

  • DC compressor position or speed detection error (medium)
  • Inverter compressor exceeding current limits (overcurrent condition) (medium)

How to Fix Error 29

DIY Fix Basic checks and power cycle

  1. Turn off the air conditioner using the remote and main power switch.
  2. Wait 5–10 minutes for the system to fully power down (allowing capacitors to discharge).
  3. Ensure the indoor and outdoor units are free from obstruction, debris, and have proper airflow.
  4. Restore power and restart the unit to check if the error clears.

Technician Only Professional compressor and inverter diagnostics

  1. Inspect compressor inverter board for fault codes using a professional HVAC service tool.
  2. Check compressor current draw and compare against manufacturer specifications.
  3. Inspect DC feedback sensors or wiring related to compressor speed/position feedback circuits.
  4. Verify outdoor unit power supply quality and proper grounding.

Parts needed: Inverter/compressor control board, Compressor motor and associated sensors, Current feedback sensors and wiring harnesses

🛑 When to Call a Pro:
  • If error persists after basic power cycling and airflow checks.
  • If the air conditioner shows repeated compressor lock‑out or overcurrent protection faults.
  • If unusual noises, burning smells, or overheating are observed around the outdoor unit.

Technical Specifications

wattage 2000W
component Control Board
resistance 5-15 ohms
part_number LG 6711A20045B
voltage_rating 220V AC

Common Questions

What does 29 error mean on lg air conditioner?

Error 29 indicates a communication failure between indoor and outdoor units, often linked to a compressor fault.

Can I fix lg air conditioner 29 error myself?

Yes, you can perform basic checks like power cycling and ensuring proper airflow.

How much does it cost to fix 29 error?

Repair costs vary; sensor or wiring repairs are moderate, while inverter board or compressor replacements can be high.

When should I call a technician for 29?

Call a technician if the error persists after checks, if repeated lock-outs occur, or if unusual noises or smells are present.

Sources & References

Data last verified: 2026-07-07

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