This situation is mostly caused by insurance (professional name is "8A") and damage of two microswitches! When this happens, the air at home will trip! This is a common fault phenomenon in maintenance! Generally, it can be repaired and used! The maintenance price is between 40 and 50, depending on how far you are from the local maintenance center! I'm talking about the door-to-door price, and the maintenance price is between 30 and 40! I work in Galanz customer service center! Hangzhou office! :)))