LG Air Conditioner Error Code E266

E266 means the top temperature sensor for compressor 1 has been detected as detached or out of position. This sensor monitors compressor shell temperature to protect against overheating. The unit will not operate normally until the sensor is re-seated in its holder and the fault is cleared.

No. The E266 code indicates the compressor is running without proper temperature monitoring at its top. Operating the unit in this condition risks overheating the compressor, which can cause permanent and costly damage. The system should be kept off until the sensor is properly re-seated and the fault is resolved.

If the sensor only needs to be re-seated, the repair cost is primarily a service call fee, typically in the range of $75 to $150 depending on your location and the service provider. If the sensor holder or the sensor itself needs replacement, parts and labor combined could range from $100 to $300 or more depending on the specific model and local labor rates.

The first step, re-inserting the sensor into its holder, is straightforward for someone comfortable working inside the unit. However, accessing the compressor compartment on most LG systems requires opening panels and working near refrigerant components and electrical connections. If you are not experienced with HVAC equipment, it is safer to have a qualified technician perform the inspection and repair.

A power reset alone will not permanently resolve E266 if the sensor is still detached from its holder. The code will return once the system restarts and detects the missing sensor signal. The sensor must be physically re-inserted and secured before the fault will clear and stay cleared.