Oven displays a generic system error and becomes unresponsive or stuck in standby.

Safety: Disconnect power before removing any panels. Electronic repairs should be done by qualified personnel.

• 1. Hard reset: Turn off the oven at the breaker for at least 10–15 minutes to fully discharge internal capacitors. Restore power and check if the error clears.
• 2. Check for stuck buttons: A permanently pressed key can sometimes trigger system errors. Inspect the control panel for stuck or damaged buttons.
• 3. Inspect control PCB: Remove the control panel and visually inspect the main PCB for obvious damage or corrosion.
• 4. Service mode (if available): Some Panasonic models allow entering a diagnostic mode via a key combination. Refer to the service manual to attempt a self-test or reset.
• 5. Replace control PCB: If the error persists and no external cause is found, the control board (with firmware and EEPROM) will likely need replacement.