Display shows a generic “Err” or “Error” message and the cooker will not operate.

Safety first: Unplug the unit before performing any resets or inspections.

• 1. Hard reset: Unplug the multicooker for at least 15 minutes. Press and hold the main power or Start/Stop button for 10 seconds (if accessible) to discharge residual power, then plug back in.
• 2. Check buttons: Press each button on the control panel to ensure none are stuck or unresponsive. Wipe the panel with a slightly damp cloth and dry.
• 3. Try different modes: Attempt to start a simple non-pressure mode (e.g., Sauté or Keep Warm). If only certain modes trigger “Err”, note which ones; this can indicate a specific sensor or heater issue.
• 4. Inspect internal connectors (advanced): With the unit unplugged and cover removed, reseat all connectors to the main PCB, including sensor, lid, and heater connections.

If the error persists after a reset and connector check, the main control board or keypad membrane is likely defective and should be replaced as an assembly.