LG Air Conditioner Error 25

⚡ Quick Answer: The LG air conditioner error code 25 indicates a communication failure between the indoor and outdoor units, leading to erratic behavior or a complete... ✅ DIY Fixable

What Does Error 25 Mean?

The LG air conditioner error code 25 indicates a communication failure between the indoor and outdoor units, leading to erratic behavior or a complete lack of response from the unit. This issue may stem from wiring problems or malfunctions in the control boards. To resolve this, power cycling the unit may help temporarily, but persistent errors require professional inspection and potential repair of communication components.

Possible Causes

  • Faulty communication cable
  • Control board malfunction
  • Improper installation

How to Fix Error 25

DIY Fix Check basic conditions and power cycle

  1. Turn off the air conditioner and disconnect power at the breaker or plug.
  2. Wait at least 2–3 minutes.
  3. Reconnect power and attempt to restart.
  4. Observe if the error code 25 still appears.

Technician Only Inspect indoor‑to‑outdoor unit communication and wiring

  1. Check communication wiring and connectors between the indoor unit and outdoor unit for secure connections and intact insulation.
  2. Verify that installation wiring conforms to LG specifications.
  3. Use diagnostic tools to check signal integrity between units.

Parts needed: Communication harness between indoor and outdoor units, Control boards of indoor/outdoor units

🛑 When to Call a Pro:
  • If error persists after power cycling.
  • If there are signs of electrical faults (sparks, burning smell).
  • If the unit fails to operate normally after basic checks.

Next step

Choose the next step for 25

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Model number required

Browse by model — no specific failed part is claimed

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.

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.

Find a part that fits my model

Search results are not a diagnosis. Verify both the complete appliance model and the retailer's fit information before ordering.

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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.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

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.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

Technical Specifications

wattage N/A
component Communication Cable
resistance N/A
part_number LG 6710A20012A
voltage_rating 230V AC

Common Questions

What does 25 error mean on lg air conditioner?

Error 25 indicates a communication failure between the indoor and outdoor units.

Can I fix lg air conditioner 25 error myself?

Yes, try power cycling the unit by turning it off for 2-3 minutes.

How much does it cost to fix 25 error?

Repair costs range from ¥5,000 to ¥30,000+, depending on diagnosis and parts.

When should I call a technician for 25?

Call a technician if the error persists after power cycling or if you notice electrical faults.

Sources & References

Data last verified: 2026-07-26

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