If the error disappears, one of your speakers or its wire is faulty.
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
: 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. If the error disappears, one of your speakers
: Turn off the unit and unplug it from the wall for at least 60 seconds to clear temporary logic errors. If the error disappears