LG Air Conditioner Error 26

⚡ Quick Answer: The LG air conditioner error code 26 indicates a communication failure between the indoor and outdoor units, primarily linked to the compressor circui... ✅ DIY Fixable

What Does Error 26 Mean?

The LG air conditioner error code 26 indicates a communication failure between the indoor and outdoor units, primarily linked to the compressor circuit. This fault can result from poor electrical connections, insulation issues within the inverter power module, or compressor malfunctions. The unit may stop operating, display the CH26 error, and the compressor might fail to start.

Common Symptoms:

  • AC stops operation and displays CH26
  • Compressor fails to start
  • Unit may shut down unexpectedly

Possible Causes

  • Poor electrical connection to compressor (U, V, W terminals) (high)
  • Insulation issue or fault within the inverter power module (IPM) (high)
  • Compressor malfunction (electrical or mechanical) (medium)
  • Indoor–outdoor unit communication fault (low)

How to Fix Error 26

DIY Fix Basic Checks Before Technician Visit

  1. Turn off the air conditioner power and disconnect from mains.
  2. Visually inspect accessible wiring between indoor and outdoor units for obvious damage or loose connectors.
  3. Ensure the outdoor unit’s compressor area is free of debris and blockages.

Technician Only Technician-Level Diagnostic and Repair

  1. Check electrical connections on compressor terminals U, V, W for proper contact and correct wiring.
  2. Measure insulation resistance of the inverter power module (IPM) and associated drive circuitry.
  3. Test compressor windings for proper resistance and insulation; replace compressor if winding faults are found.
  4. Verify PCB and IPM power components for damage and replace as needed.

Parts needed: Compressor, Inverter Power Module (IPM), Control PCB, Wiring harness/connectors

🛑 When to Call a Pro:
  • If error persists after basic checks
  • If you observe burning smell, smoke, or unusual noises
  • If any electrical components are visibly damaged

Next step

Choose the next step for 26

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

Check during diagnosis

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.

Find a part that fits my model

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.

Possible related component

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

$90 - $320 · Hard · 45-120 mins

Check fit & price
Possible related component

Wiring Harness

Connects controls, sensors, motors, and other electrical components inside the appliance.

$20 - $120 · Medium · 30-90 mins

Check fit & price
Model number required

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.

Find a part that fits my model

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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

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does 26 error mean on lg air conditioner?

Error 26 indicates a communication failure related to the compressor circuit, causing the unit to stop operating.

Can I fix lg air conditioner 26 error myself?

Yes, you can perform basic checks, such as inspecting wiring and ensuring the outdoor unit is clear of debris.

How much does it cost to fix 26 error?

Repair costs for error 26 can range from ¥20,000 to ¥120,000+, depending on parts and labor.

When should I call a technician for 26?

Call a technician if the error persists after checks, or if you notice burning smells, smoke, or damaged components.

Sources & References

Data last verified: 2026-07-31

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