Lg Air Conditioner Error 1

⚡ Quick Answer: The LG air conditioner error code 01 indicates a communication failure between the indoor and outdoor units, often due to a fault in the indoor unit's... ✅ DIY Fixable

What Does Error 1 Mean?

The LG air conditioner error code 01 indicates a communication failure between the indoor and outdoor units, often due to a fault in the indoor unit's return-air thermistor (temperature sensor). This results in the unit stopping operation, issues with temperature regulation, and may cause the display to blink. If the error persists after basic troubleshooting, further inspection or replacement of the thermistor may be necessary.

Common Symptoms:

  • Unit stops operation with error 01 displayed
  • Temperature regulation issues
  • Possible blinking indicator corresponding to code 01

Possible Causes

  • Faulty indoor return‑air thermistor (temperature sensor) (medium)

How to Fix Error 1

DIY Fix Check basic airflow and reset

  1. Turn off the air conditioner and disconnect power for a few minutes
  2. Ensure indoor unit filters are clean and airflow is not obstructed
  3. Power the unit back on and observe if error returns

Technician Only Test/replace indoor return‑air thermistor

  1. Disconnect indoor unit power and remove access panel
  2. Locate the return‑air thermistor on indoor unit evaporator return air path
  3. Measure resistance of the thermistor per manufacturer specification
  4. Replace thermistor if outside expected range or open/shorted

Parts needed: Return‑air thermistor / temperature sensor

🛑 When to Call a Pro:
  • If basic reset does not clear error
  • If thermistor readings are ambiguous or accessibility is difficult
  • If multiple error codes appear concurrently

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number LG 6711A20016A
voltage_rating 220V AC

Common Questions

What does 1 error mean on lg air conditioner?

Error 01 indicates a communication failure, usually due to a faulty return-air thermistor.

Can I fix lg air conditioner 1 error myself?

Yes, you can perform basic troubleshooting like cleaning filters and resetting the unit.

How much does it cost to fix 1 error?

The cost to replace the thermistor ranges from $20 to $100, plus labor.

When should I call a technician for 1?

Call a technician if resetting doesn't help or if multiple error codes appear.

Sources & References

Data last verified: 2026-01-11

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