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
- Turn off the air conditioner using the remote and main power switch.
- Wait 5–10 minutes for the system to fully power down (allowing capacitors to discharge).
- Ensure the indoor and outdoor units are free from obstruction, debris, and have proper airflow.
- Restore power and restart the unit to check if the error clears.
Technician Only Professional compressor and inverter diagnostics
- Inspect compressor inverter board for fault codes using a professional HVAC service tool.
- Check compressor current draw and compare against manufacturer specifications.
- Inspect DC feedback sensors or wiring related to compressor speed/position feedback circuits.
- 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
- 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.
Next step
Choose the next step for 29
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Compressor
Compresses refrigerant within the sealed cooling system and requires specialized service equipment.
- Typical part-only price
- $180 - $600
- DIY difficulty
- Hard
- Estimated time
- 120-240 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
Model-compatible Air Conditioner parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
Model-Compatible Washable AC Filter
A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.
Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
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
- LG Air Conditioner Guide to Error Codes (official)
Data last verified: 2026-07-26
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