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

  1. Turn off the AC and disconnect power at the breaker or power plug
  2. Wait at least 5–10 minutes to allow the system to fully reset
  3. Restore power and restart the unit to see if error clears

Technician Only Professional diagnosis and repair

  1. Measure outdoor unit inverter and compressor current levels
  2. Inspect inverter PCB and IGBT components for damage or overheating
  3. Check outdoor unit wiring integrity and insulation
  4. Perform compressor electrical performance tests and verify no overload conditions

Parts needed: inverter PCB/IGBT module, compressor motor and windings, outdoor unit wiring harness

🛑 When to Call a Pro:
  • If CH27 repeats after power reset
  • If outdoor unit isn’t running normally or makes unusual noise
  • If any wiring appears damaged or overheated

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: 2026-07-07

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