U01 or similar user code appears and the cooker refuses to start until cleared.

Safety first: No internal electrical risk for this issue, but always unplug before opening the housing.

• Disable child lock: Refer to your Oursson manual; typically, holding a specific button (e.g., 'Keep Warm' or a lock icon) for 3–5 seconds toggles the lock. Try this with the unit powered on.
• Clean control panel: Wipe the panel with a slightly damp cloth and then dry. Sticky residue can cause buttons to appear pressed.
• Power reset: Unplug for 10 minutes, then reconnect and check if the lock indicator or U01 code clears.
• Button test: Press each button individually and confirm they click or respond normally. If one button is unresponsive or always 'on', the keypad may need replacement.