1. Cause analysis and treatment of failure to start after power-on: the power cord is broken or the connector is off-welded, carefully find the broken point or off-welded place and re-weld; If the on-off switch is disconnected or has poor contact, check whether the circuit breaker is welded well, and replace it with a new one if the contact is poor; The starting capacitor capacity of the motor is reduced or short-circuited or open-circuited, so it is necessary to replace the capacitor with the same specification to make the motor run; The variable speed coil is open or short-circuited, and the variable speed coil is repaired or replaced with a new product; The bearing is damaged and stuck on the rotating shaft, so the bearing must be replaced; The stator winding is short-circuited or the connecting wire is broken. Repair the stator winding or replace it with a new one.
2. Cause analysis and treatment of abnormal sound or noise in operation: improper assembly makes the blade loose, and when it touches the air guide frame, it produces abnormal sound, and the fastening blade is reassembled correctly; The motor bearing is badly worn, so the bearing of the same model must be replaced; The motor is poorly assembled. Correct the gap between the stator and rotor of the motor to make it uniform.