For your reference, here is more information about the Xiaomi Automatic Soap Dispenser 1S not working:
Please check the battery level of your device in time and try to charge it for a while before checking again to see if it can be used normally;
It can be that power is not turned on. Press the power button for a few seconds until the indicator lights up;
It can be that the sensor is blocked or dirty. Check whether dust, soap, or water is on the sensor window. If so, gently wipe the sensor area with a soft, dry cloth.
If none of the above methods can solve this problem, please contact the local after-sales service for assistance.