LG Washer Error Code AO

The AO code on an LG washer indicates an Auto Off relay failure. The washer's control system has detected a fault in the circuit responsible for the automatic shutoff function. This is traced to either a bad connection at the BLUE 1-pin connector going to the PWB ASM or a defective PWB ASM itself. The machine will not run normally until the fault is corrected.

It is not recommended to continue running the washer while the AO code is active. This fault involves the auto-off relay, which is a key part of the power control circuit. Operating the machine with a relay fault could pose a risk of the washer failing to shut off properly or experiencing unintended electrical behavior.

A basic reset may temporarily clear the AO code, but the error will return if the underlying cause has not been addressed. Because this fault is tied to a physical connection issue or a board defect, it requires hands-on inspection and correction rather than a software-level reset. Always diagnose the connector and board before assuming a reset has resolved the problem.

In many cases, yes. The first step is to locate and inspect the BLUE 1-pin connector on the PWB ASM for a loose or corroded connection, then reseat or clean it. If the connector is in good condition and the error persists, the control board will need to be replaced, which is a more involved repair that requires working with the electrical components inside the machine.

If the fix is simply reseating or cleaning the BLUE 1-pin connector, there is little to no parts cost involved. If the PWB ASM needs to be replaced, parts alone typically range from around $100 to $300 or more depending on the specific model, with additional labor costs if a technician performs the repair.