Patent Document ID: 20020128728
Application ID: 10090779
Patent Flag: 0

Claim One:
1. A remote maintenance system comprising: a center server that is located in a service center for performing maintenance of an electrical appliance; and a home server that is located in each house and monitors a status of an electrical appliance in a house, wherein the center server and the home server are connected via a communication line, the home server includes: a status value acquiring unit operable to acquire a status value of each electrical appliance; a failure model receiving unit operable to receive from the center server a failure model which is information defining a method for deriving a decision whether the electrical appliance is failed or not from the status value; and a failure deciding unit operable to decide whether the electrical appliance is failed or not based on the acquired status value and the received failure model using qualitative reasoning, and the center server includes a failure model updating unit operable to update the failure model and send the updated failure model to the home server.