If the error persists even with no speakers connected, the issue is likely an in the amplifier board that requires professional repair.
: This usually occurs due to an internal short circuit . This can be caused by: Frayed or touching speaker wires. A faulty speaker drawing too much power. Internal component failure within the amplifier circuit. s003-001-lg
: Ensure the unit has enough space for airflow. Overheating can sometimes trigger protection modes to prevent a fire hazard. If the error persists even with no speakers
For official repair support or to find a local service center, you can use the LG Support Locator to book a technician. How to Fix S Protection on LG Sound Systems | Expert Q&A s003-001-lg