LG Washer Error Code AC3

The AC3 error on an LG washer indicates a communication error between the WIFI module and the main PBA (printed board assembly). The main control board is not detecting the expected signals from the WIFI module. This is typically caused by a loose connector, damaged wiring, or faulty soldering between the two components. In some cases, the WIFI module or main PBA itself may have failed.

The AC3 error relates specifically to the WIFI module communication and does not directly affect the core washing functions of the machine. However, it is best to address the error promptly, as underlying wiring or board issues can sometimes indicate broader electrical concerns. If the washer is otherwise completing cycles normally, the risk is low, but continued use without diagnosis is not recommended.

Repair costs depend on the root cause. If the fix is simply reseating a loose connector, the cost may only be a service call fee, typically ranging from $75 to $150. If the WIFI module needs replacement, parts and labor can range from $100 to $250 or more. A main PBA replacement, if required, is the most expensive scenario and can range from $200 to $400 or higher depending on parts availability and labor rates.

If you are comfortable opening the washer cabinet, you can start by checking whether the connector between the WIFI module and the main PBA is fully seated and undamaged. Reseating a loose connector requires no special tools and no parts. However, if the issue involves damaged wiring, faulty solder joints, or a failed board, those repairs are better handled by a qualified technician.

A reset may temporarily clear the AC3 error from the display, but if the underlying cause, such as a loose connector or faulty component, has not been corrected, the code will return. Resetting the machine can be useful to confirm whether the error is intermittent, but it is not a substitute for inspecting the WIFI module and its connections.