LG Air Conditioner Error 27
⚡ Quick Answer: The LG air conditioner error code 27 (CH27) indicates a communication failure between the indoor and outdoor units, often due to an inverter over-curr... ✅ DIY Fixable
What Does Error 27 Mean?
The LG air conditioner error code 27 (CH27) indicates a communication failure between the indoor and outdoor units, often due to an inverter over-current fault. This protective shutdown prevents the compressor from engaging properly, leading to operational failure. Common symptoms include the outdoor unit running briefly before stopping and the display panel showing the error code. This issue is typically linked to electrical irregularities in the inverter/compressor circuit.
Common Symptoms:
- AC stops operation and displays CH27 on panel
- Outdoor unit runs briefly and stops
- Compressor fails to engage properly or system trips shortly after start
Possible Causes
- Inverter/IGBT over‑current fault (medium)
- Outdoor unit compressor electrical fault or overload (medium)
How to Fix Error 27
DIY Fix Basic user actions to attempt before service
- Turn off the AC and disconnect power at the breaker or power plug
- Wait at least 5–10 minutes to allow the system to fully reset
- Restore power and restart the unit to see if error clears
Technician Only Professional diagnosis and repair
- Measure outdoor unit inverter and compressor current levels
- Inspect inverter PCB and IGBT components for damage or overheating
- Check outdoor unit wiring integrity and insulation
- Perform compressor electrical performance tests and verify no overload conditions
Parts needed: inverter PCB/IGBT module, compressor motor and windings, outdoor unit wiring harness
- If CH27 repeats after power reset
- If outdoor unit isn’t running normally or makes unusual noise
- If any wiring appears damaged or overheated
Next step
Choose the next step for 27
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 | 1500W |
|---|---|
| component | Control Board |
| resistance | 5-10 ohms |
| part_number | LG 6711A20045D |
| voltage_rating | 230V AC |
Common Questions
What does 27 error mean on lg air conditioner?
Error 27 indicates a communication failure, linked to an inverter fault, causing the unit to stop working.
Can I fix lg air conditioner 27 error myself?
Yes, try resetting the unit by turning it off and disconnecting power for 5-10 minutes.
How much does it cost to fix 27 error?
Repair costs for error 27 range from $200 to $800, depending on parts and labor.
When should I call a technician for 27?
Call a technician if the error reoccurs after a reset or if you notice unusual sounds or damaged wiring.
Sources & References
Data last verified: 2026-07-26
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