What to do if the buttons on the Mijia Refrigerator Side-by-Side 621L's display are unresponsive?

If the buttons on the Mijia Refrigerator Side-by-Side 621L are unresponsive, please refer to the following troubleshooting steps:
1. Please check if the child lock function is enabled. When the child lock is enabled, the buttons except the mode button cannot be operated.
2. If the child lock is not enabled, please unplug the refrigerator for 3 to 5 minutes and then plug it back in.
3. Sometimes, water droplets, condensation, or dirt on the display can prevent the buttons from registering touches. Wipe the panel gently with a soft, dry cloth.
4. Fluctuating or unstable electricity can cause the display buttons to malfunction. Make sure the refrigerator is plugged into a stable power source.
5. Pressing multiple buttons at the same time can temporarily freeze the buttons. Try pressing one button at a time.
6. If the issue persists, please contact the local after-sales service center for inspection.