Why doesn't the knob work after the Xiaomi Smart Air Fryer 4.5L is powered on?

If the knob work does not work after the device is powered on, please refer to the following troubleshooting steps:
1. Please check whether the knob is deformed or cracked;
2. Please check whether the knob is interfered by foreign objects, which can affect the knob rotating action.
If the above situation still occurs, please contact the after-sales for inspection.