LG Air Conditioner Error Code 227

Error code 227 on an LG air conditioner indicates a sub-cooling discharge pipe temperature sensor error on HR unit 7. The control board has detected that the sensor signal reflects either an open circuit or a short circuit condition. This fault causes the system to shut down as a protective measure until the sensor circuit is restored to normal operation.

Error code 227 is not an immediate safety hazard to occupants, but it does indicate a sensor fault that prevents the system from monitoring refrigerant temperatures accurately. Operating the system without a functioning sub-cooling discharge temperature sensor could lead to improper refrigerant management and potential damage to system components. The unit will typically shut down automatically to prevent further damage.

Repair costs vary depending on the specific cause. If the fix involves only re-seating a connector or cleaning corroded terminals, labor costs may be in the range of $75 to $150. If the temperature sensor itself requires replacement, parts and labor together typically run between $150 and $350. Control board replacement, if necessary, is a more expensive repair and can range from $400 to $800 or more depending on the unit.

Start by inspecting the temperature sensor connector and its lead cable for any loose connections, visible damage, or corrosion. Re-seat any disconnected connectors and check the wiring for pinches or breaks. If the connections look intact, use a multimeter to test the thermistor resistance and compare it against the expected value for the ambient temperature. If the sensor has failed, it will need to be replaced.

A power reset may temporarily clear the error code, but if the underlying sensor or wiring fault is still present, the code will return shortly after the system restarts. The fault must be physically diagnosed and repaired before the error will clear permanently. Repeated resets without addressing the root cause can delay proper diagnosis and risk damage to system components.