LG Air Conditioner Error 46
⚡ Quick Answer: The LG air conditioner error code 46 indicates a communication failure between the indoor and outdoor units, often due to a faulty outdoor suction lin... ⚠️ Difficulty Varies
What Does Error 46 Mean?
The LG air conditioner error code 46 indicates a communication failure between the indoor and outdoor units, often due to a faulty outdoor suction line temperature sensor (thermistor). This issue typically prevents the unit from cooling effectively, triggering a protective shutdown. To resolve this, basic checks can be performed, but more complex issues may require professional inspection and replacement of the sensor.
Common Symptoms:
- AC display shows CH46 or 46 error
- Outdoor unit may stop cooling or shut down
- Possible system protection triggered due to sensor fault
Possible Causes
- Outdoor suction line temperature sensor (thermistor) fault (medium)
How to Fix Error 46
DIY Fix Basic checks and reset
- Turn off the air conditioner via remote or circuit breaker
- Wait 5–10 minutes then restore power
- Check that the outdoor unit is free of debris and has good airflow around it
- Observe whether error returns after reset
Technician Only Inspect and replace outdoor suction line sensor
- Disconnect power at breaker
- Remove outdoor unit cover to access suction line thermistor
- Test thermistor resistance to confirm open or short condition
- Replace faulty thermistor sensor if readings are out of range
- Reassemble and test system operation
Parts needed: Outdoor suction line thermistor sensor, Possibly wiring harness
- If the error persists after basic reset and inspection
- If there are signs of refrigerant leaks or other mechanical faults
- If you are not comfortable handling outdoor unit inspection
Next step
Choose the next step for 46
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.
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 | N/A |
|---|---|
| component | Communication wire |
| resistance | N/A |
| part_number | LG 6711A20030A |
| voltage_rating | 230V AC |
Common Questions
What does 46 error mean on lg air conditioner?
Error 46 indicates a communication failure due to a faulty outdoor suction line temperature sensor.
Can I fix lg air conditioner 46 error myself?
Yes, you can perform basic checks and reset the unit, but sensor replacement may require a technician.
How much does it cost to fix 46 error?
Repair costs for the sensor range from $50 to $150, plus additional labor costs.
When should I call a technician for 46?
Call a technician if the error persists after a reset, or if there are signs of refrigerant leaks or mechanical faults.
Sources & References
Data last verified: 2026-07-26
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