LG Air Conditioner Error Code 225

Error code 225 indicates a liquid pipe temperature sensor fault in HR unit 7 of the system. The control board has detected either an open circuit or a short circuit in the sensor or its wiring, meaning it cannot read a valid temperature from that refrigerant line. This fault may cause HR unit 7 to stop operating until the sensor issue is corrected.

The system may limit or shut down operation of HR unit 7 automatically as a protective measure when this code is active, which reduces the risk of refrigerant system damage. Running the system in a degraded state without resolving the fault is not recommended, as the control board relies on this sensor data to protect the compressor and manage refrigerant flow properly.

Repair costs depend on what component has failed. If only the connector needs reseating or cleaning, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the liquid pipe temperature sensor requires replacement, parts and labor together may range from $150 to $400 depending on the specific unit configuration and local labor rates. Control board replacement, if needed, would be at the higher end of repair costs.

Some causes of error 225, such as a loose connector, can be addressed by a knowledgeable DIYer by carefully inspecting and reseating the sensor connections. However, testing the thermistor with a multimeter and working on a VRF or multi-zone HR system requires technical knowledge of the refrigerant circuit and electrical components. If the sensor or wiring needs replacement, a qualified HVAC technician is recommended for this type of system.

A power reset may temporarily clear the displayed fault, but the error will return quickly if the underlying sensor or wiring issue has not been repaired. The control board will re-detect the open or short condition in the sensor circuit and repost the fault during normal operation. A proper repair of the sensor, connector, or wiring is required for the code to stay cleared.