LG Air Conditioner Error Code 245

Error code 245 on an LG air conditioner signals a central controller send timeout. This means the central controller attempted to send data to the CNU within the system's communication network but the transmission was not completed within the required time. It is a network communication fault rather than a refrigeration or mechanical failure.

A full power cycle of the central controller may temporarily clear the error if the fault was caused by an incomplete initialization. However, if the underlying cause is a wiring fault, address conflict, or failed CNU, the error code will return after the system restarts and attempts communication again.

Repair costs vary depending on the root cause. If the fix involves only reconfiguring network addresses or reseating wiring, labor costs may range from around $75 to $200 depending on your location and service provider. If the CNU hardware itself needs replacement, parts and labor combined could range from $200 to $600 or more, particularly in commercial or multi-zone systems.

Some basic steps, such as power cycling the central controller and confirming the CNU is powered and initialized, can be performed by a knowledgeable user. However, diagnosing wiring faults on a commercial communication bus or reconfiguring network addresses typically requires a qualified HVAC technician with access to the system's network configuration tools.

Error code 245 is a communication fault between the central controller and the CNU, not a safety-critical mechanical or electrical hazard. However, with this fault active the central controller cannot reliably manage the connected units, which means climate control and potentially protective shutdown functions may not operate correctly. It is best to have the fault diagnosed before continuing extended operation.