Possible causes: 1) The sensor head is covered by dirt or has aged. 2) Power supply is insufficient (e.g., low battery or loose wiring in battery-operated models). 3) Ambient light interferences (e.g., strong light affecting infrared sensing).

Solutions: 1) Regularly clean the sensor head surface to avoid scale or dust coverage. 2) Check the power connection or replace the battery. 3) Reposition the sensor to avoid direct exposure to strong light.

Possible causes: 1) The detection range is too wide, mistakenly identifying passersby or nearby objects. 2) Solenoid valve malfunction or improper sensitivity settings. 3) The water flow time parameter is not calibrated (e.g., excessive flushing time).

Solutions: 1) Adjust the sensing distance and flushing duration via DIP switches or buttons. 2) Replace with a high-quality solenoid valve. 3) Contact after-sales to calibrate sensing parameters or replace faulty components.

Possible causes: 1) Insufficient water pressure. 2) Filter blockage or impurities in the pipeline. 3) Flow restrictor not adjusted (some products require manual flow adjustment).

Solutions: 1) Check the water pressure and install a booster pump if necessary. 2) Clean the inlet filter. 3) Adjust the flow restrictor according to the manual.

Possible causes: 1) The Auto Hygiene Flush function is enabled (some models are preset to flush periodically to prevent odors). 2) The sensor is interfered with by the environment (e.g., mosquitoes triggering the sensor). 

Solutions: 1) Disable the Auto Hygiene Flush function, or adjust the hygiene flush interval. 2) Choose products with "Last Flush" technology.