LG Air Conditioner Error 48
⚡ Quick Answer: The LG air conditioner error code 48 indicates a communication failure between the indoor and outdoor units, often due to a disconnected or shorted li... ✅ DIY Fixable
What Does Error 48 Mean?
The LG air conditioner error code 48 indicates a communication failure between the indoor and outdoor units, often due to a disconnected or shorted liquid line thermistor at the outdoor unit. This issue can prevent the outdoor unit from functioning properly, leading to reduced cooling performance and potential operational failure.
Common Symptoms:
- Unit displays error code 48 on remote or panel
- Outdoor unit may not run or cooling performance reduced
- Thermistor related sensor fault detected
Possible Causes
- Outdoor unit liquid‑line thermistor (coil outlet sensor) disconnected or shorted (medium)
How to Fix Error 48
DIY Fix Basic checks before service
- Turn off the air conditioner and disconnect power for safety
- Visually inspect outdoor unit wiring for obvious loose connections
- Restart power after a few minutes to see if the code clears
- Check if outdoor unit fan or compressor is running
Technician Only Thermistor circuit inspection and replacement
- Disconnect power and safely access outdoor unit control board
- Test the liquid line thermistor for open or short circuit using a multimeter
- Inspect wiring harness and connectors for damage or corrosion
- Replace faulty thermistor and any damaged wiring
- Reset error codes and verify normal operation
Parts needed: liquid line thermistor (outdoor coil outlet), wiring harness, possibly outdoor unit control board if damaged
- If error reappears after basic reset and visual checks
- If outdoor unit components (fan, compressor) do not operate
- If connector or board damage is suspected
Next step
Choose the next step for 48
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.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
HVAC Control Board
Controls fan, compressor, sensor, and communication functions in the HVAC unit.
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.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
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 | 2000W |
|---|---|
| component | Control Board |
| resistance | 20-50 ohms |
| part_number | LG 6711A20050B |
| voltage_rating | 220V AC |
Common Questions
What does 48 error mean on lg air conditioner?
Error 48 indicates a communication failure due to a thermistor issue, affecting cooling performance.
Can I fix lg air conditioner 48 error myself?
Yes, you can perform basic checks like inspecting wiring and resetting the unit.
How much does it cost to fix 48 error?
The estimated repair cost ranges from $80 to $250, depending on parts and labor.
When should I call a technician for 48?
Call a technician if the error persists after a reset or if the outdoor unit components fail to operate.
Sources & References
Data last verified: 2026-07-26
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