Display shows a generic system error; machine locks out most functions and may beep or flash.

Safety first: Unplug the machine before opening any panels.

• Hard reset: Turn the machine off, unplug it for at least 5 minutes, then plug back in and power on. This can clear transient faults.
• Check for moisture: Inspect the area around the control board for signs of leaks or condensation, especially near the boiler and steam lines. Dry any moisture and correct the source of the leak.
• Inspect connectors: Reseat all multi-pin connectors on the control board, ensuring they are fully seated and not corroded.
• Surge protection: If the error occurred after a power outage or storm, the board may have been damaged by a surge. Use a surge protector in the future.
• Persistent system error: If the error remains after these steps, the control board likely needs replacement and reprogramming by an authorized Rocket service center.