LG Air Conditioner Error 5

⚡ Quick Answer: The LG air conditioner error 5 indicates a communication failure between the indoor and outdoor units, often labeled as CH05. This error results in a ... ✅ DIY Fixable

What Does Error 5 Mean?

The LG air conditioner error 5 indicates a communication failure between the indoor and outdoor units, often labeled as CH05. This error results in a loss of signal between the unit's PCBs or issues with circuit breaker communication, leading to the indoor unit appearing powered while the outdoor unit fails to operate. Users may notice that the system stops functioning entirely.

Common Symptoms:

  • Unit stops operating and displays code 5 or CH05
  • Indoor and outdoor units not communicating
  • Outdoor unit may not run even if indoor appears powered

Possible Causes

  • Communication wiring fault between indoor and outdoor units (high)
  • Faulty PCB in indoor or outdoor unit affecting communication (medium)

How to Fix Error 5

DIY Fix Basic checks and reset

  1. Turn off power to both indoor and outdoor units via circuit breaker.
  2. Wait at least 3–5 minutes.
  3. Turn both indoor and outdoor breakers back on simultaneously.
  4. Check if error clears and unit operates normally.

Technician Only Inspect and repair communication wiring

  1. Turn off all power to the system.
  2. Open access panels on indoor and outdoor units.
  3. Verify communication cable connections are correct according to wiring diagram.
  4. Check wiring for damage, shorts, open circuits, or reversed polarity.
  5. Replace or repair wiring as needed and test communication.
  6. Verify circuit breaker function and replace if faulty.

Parts needed: Communication cables between units, Connectors/terminal blocks, Potential PCB if diagnosed faulty

🛑 When to Call a Pro:
  • If error persists after reset and visual wiring check
  • If wiring damage is suspected but user is not qualified
  • If PCB or component-level diagnosis/repair is required

Next step

Choose the next step for 5

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 Control Board
resistance N/A
part_number LG 6871A20045D
voltage_rating 220V AC

Common Questions

What does 5 error mean on lg air conditioner?

Error 5 indicates a communication failure between the indoor and outdoor units, stopping operation.

Can I fix lg air conditioner 5 error myself?

Yes, you can try resetting the system by turning off the power to both units for 3-5 minutes.

How much does it cost to fix 5 error?

Repair costs range from $80 to $300, depending on wiring or PCB replacement needs.

When should I call a technician for 5?

Call a technician if the error persists after a reset or if wiring damage is suspected.

Sources & References

Data last verified: 2026-07-26

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