Display shows 'Err' or 'Error' and beeps; no specific numeric code is given.

Safety: Unplug the appliance before any internal inspection.

• Power cycle: Unplug the multicooker for at least 10 minutes to allow the control board to fully discharge. Plug back in and test.
• Check mains supply: Ensure the outlet provides stable voltage within the range specified on the rating plate. Avoid using long or undersized extension cords.
• Inspect control panel: Wipe the keypad and display area dry. Moisture or spilled liquids can cause phantom key presses. If the panel is wet, let it dry completely before use.
• Test buttons: With power on, press each button individually and check for normal response. A button that appears always pressed may indicate a faulty keypad membrane.
• Internal check: If comfortable, remove the outer housing to access the control PCB. Look for burnt components, cracked solder joints at the display or keypad connector, and reseat all connectors.
• Replace PCB: If 'Err' persists and no external cause is found, replace the control board assembly.