LG Air Conditioner Error Code 215

Error code 215 on an LG air conditioner indicates a temperature sensor fault on the sub-cooling discharge pipe of HR unit 4. The system has detected either an open circuit or a short circuit condition in that sensor circuit. This error prevents the unit from operating without accurate temperature data, protecting the system from potential damage.

Continuing to run the system with error code 215 active is not recommended. The sub-cooling discharge pipe temperature sensor plays an important role in monitoring thermal conditions within the heat recovery unit. Operating without a valid sensor reading could allow the system to run outside safe temperature limits, potentially causing refrigerant or compressor damage over time.

Repair costs vary depending on the cause. If the fix is simply reseating a loose connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the discharge pipe temperature sensor generally adds $50 to $150 in parts. If the control board requires replacement, total costs can range from $400 to $900 or more depending on the specific unit and labor rates in your area.

A homeowner comfortable with basic electrical checks can inspect the sensor connector and lead cable for obvious damage, loose connections, or corrosion. However, measuring thermistor resistance and diagnosing deeper wiring or control board faults requires a multimeter and some technical knowledge. If the wiring and connector look intact, it is best to have a qualified HVAC technician perform further diagnostics and any necessary component replacement.

A simple power reset may temporarily clear the error, but it will return if the underlying sensor or wiring fault is still present. The error code 215 is triggered by a real circuit condition, either an open or short, that the control board will detect again on startup. The fault must be physically resolved before the error clears permanently.