LG Washer Error Code S

The S error code on an LG washer indicates a Micro Controller operational error, which is a system-level fault on the main PCB assembly. It means the central control chip that manages all washer functions has detected an internal failure and halted operation. This is a serious fault that typically requires replacement of the PCB assembly to resolve.

A power cycle reset by unplugging the unit for several minutes may clear the S code if the fault was caused by a temporary voltage anomaly rather than physical damage to the board. However, if the micro controller has suffered actual internal failure, the S code will return as soon as the washer powers back on. A reset is always worth trying first, but a recurring S code after a reset confirms a hardware fault requiring PCB replacement.

Repair costs depend primarily on the price of the replacement PCB assembly and whether you hire a technician. PCB assemblies for LG washers typically range from $100 to $300 or more depending on the model. Adding professional labor, total repair costs commonly fall in the range of $200 to $500. Getting a cost estimate before proceeding is advisable, as on older machines the repair cost may approach the value of the unit.

The first recommended step is to unplug the washer for 5 to 10 minutes and then restore power to see if the code clears on its own. If the S code returns, the fix requires replacing the main PCB assembly, which involves disconnecting multiple wire harnesses and handling sensitive electronic components. This repair is achievable for experienced DIYers comfortable working with appliance electronics, but many homeowners prefer to have a qualified technician handle PCB replacement.

No, you should not attempt to run the washer while the S error code is active. The code indicates the micro controller that oversees all machine functions is not operating correctly, meaning the washer cannot reliably control water valves, the motor, or cycle sequencing. Continuing to operate the machine in this state could lead to unpredictable behavior such as overfilling or motor faults.