Possible site of occurrence:
1.Inlet power failure a. Power over-voltage b. Poor power line contact c. Controller failure
2.The power light flashes, and the buzzer alarms
Solutions:
1.Readjust the voltage of the incoming power supply
2.Check whether the incoming power supply has a broken phase, or false connection, and connect solidly if it exists, including the sampling line of automatic conversion appliances.
3.Reinsert the controller plug-in or replace the controller.
4.The neutral and phase wires of the incoming power supply are connected backwards, re-correct and connect.