Air door fault detection method

The invention discloses an air door fault detection method, and relates to the technical field of refrigerator fault detection, and the method comprises the following steps: S1, a refrigerator collects and obtains the operation state data of the refrigerator, and uploads the operation state data to a cloud platform; s2, the cloud platform classifies the fault types according to the types of the running state data on the basis of the collected and uploaded running state data; s3, after the fault type is determined, calling the running state data corresponding to the fault type to be compared with preset basic data, and calculating a size ratio between the running state data and the preset basic data; s4, whether the refrigerator air door breaks down or not is judged according to the calculated size ratio result; based on the running state data uploaded to the cloud end by the refrigerator, whether the air door fault exists or not is judged through comparison of different temperatures and the duration time, imp