LG Air Conditioner Error Code 229

Error code 229 on an LG air conditioner indicates a liquid pipe temperature sensor error on HR unit 8. The system has detected either an open circuit or a short circuit in the sensor or its wiring. This fault prevents accurate refrigerant temperature monitoring and causes the system to limit or stop operation. The first step is to inspect the sensor connector and lead cable on that specific HR unit.

Continuing to operate the system with an active sensor fault is not recommended. The liquid pipe temperature sensor provides data that the system uses to protect the compressor and regulate refrigerant flow. Without accurate readings from this sensor on HR unit 8, the system cannot respond correctly to changing conditions, which could lead to component damage over time. Address the fault before resuming normal operation.

A power reset may temporarily clear the error from the display, but the code will return if the underlying sensor or wiring fault is still present. Error code 229 is a hardware fault tied to a specific component condition, not a communication glitch, so resetting the unit without addressing the root cause will not resolve the problem. A proper repair requires inspecting and testing the sensor, lead cable, and connectors on HR unit 8.

Some causes of error code 229, such as a loose connector or a visibly damaged wire, can be addressed by a knowledgeable DIYer with basic electrical tools. However, working on a heat recovery or VRF-style system involves refrigerant circuits and complex networked control systems, so more advanced repairs are best handled by a certified HVAC technician. If the sensor itself needs replacement, confirm the correct part before ordering and ensure the power is disconnected before handling any electrical components.

Repair costs depend on the root cause. If only a connector needs cleaning or reseating, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the temperature sensor requires replacement, parts and labor combined generally range from $150 to $400. Control board replacement, if needed, is more expensive and can range from $400 to $900 or more depending on the system model and labor rates in your area.