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
- Turn off the air conditioner and disconnect power for a few minutes
- Ensure indoor unit filters are clean and airflow is not obstructed
- Power the unit back on and observe if error returns
Technician Only Test/replace indoor return‑air thermistor
- Disconnect indoor unit power and remove access panel
- Locate the return‑air thermistor on indoor unit evaporator return air path
- Measure resistance of the thermistor per manufacturer specification
- Replace thermistor if outside expected range or open/shorted
Parts needed: Return‑air thermistor / temperature sensor
- If basic reset does not clear error
- If thermistor readings are ambiguous or accessibility is difficult
- If multiple error codes appear concurrently
Next step
Choose the next step for 1
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Thermistor
Measures precise temperature changes and sends resistance feedback to the control board.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 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.
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.
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
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.
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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.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
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.
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 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: 2026-07-26
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