Lg Air Conditioner Error 28

⚡ Quick Answer: The LG air conditioner error code 28 signifies a communication failure between the indoor and outdoor units. This issue may prevent the unit from oper... ⚠️ Difficulty Varies

What Does Error 28 Mean?

The LG air conditioner error code 28 signifies a communication failure between the indoor and outdoor units. This issue may prevent the unit from operating correctly and often results in a loss of cooling or heating function. It can stem from problems with the inverter DC link or electrical faults in the outdoor unit, leading to disrupted signals between the units.

Common Symptoms:

  • Display of error code “28” on indoor unit or remote
  • Air conditioner stops operation shortly after start
  • Possible loss of cooling/heating function due to fault detection

Possible Causes

  • Indoor–outdoor unit communication fault (medium)
  • Inverter/DC link high voltage or electrical fault in outdoor unit (medium)

How to Fix Error 28

DIY Fix Basic user checks and restart

  1. Turn off the unit and disconnect power at the breaker for 5–10 minutes
  2. Reconnect power and restart to see if the error clears
  3. Check that the indoor and outdoor units are correctly powered and that wiring/connectors visible to the user are secure
  4. Ensure outdoor unit is not obstructed and filters are clean

Technician Only Technician diagnosis of communication/inverter fault

  1. Use service diagnostic tools to read detailed fault logs from the indoor and outdoor boards
  2. Verify communication wiring integrity between indoor and outdoor units (connector continuity, no corrosion)
  3. Measure DC link and supply voltages to verify inverter circuit health
  4. Test/reland control boards if communication or inverter electronics faults are present

Parts needed: communication cable, indoor control board, outdoor inverter module/DC link components

🛑 When to Call a Pro:
  • Error persists after power cycle and basic checks
  • Repeated occurrences of error 28
  • Any unusual noises, smells, or inability to operate after reset

Technical Specifications

wattage N/A
component Communication Wire
resistance N/A
part_number LG 6711A20045A
voltage_rating 220V AC

Common Questions

What does 28 error mean on lg air conditioner?

Error 28 indicates a communication failure between indoor and outdoor units, preventing operation.

Can I fix lg air conditioner 28 error myself?

Yes, you can try power cycling the unit and checking connections before seeking professional help.

How much does it cost to fix 28 error?

Repair costs for error 28 range from ¥20,000 to ¥80,000+, depending on parts and labor.

When should I call a technician for 28?

Call a technician if the error persists after resetting, recurs frequently, or if you notice unusual sounds or smells.

Sources & References

Data last verified: 2026-01-10

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