Method for maintenance of a non-computing appliance whose primary function is not to process data, such as a kitchen appliance, the method comprising the steps of: a2) identifying a datum representative of the lifetime of at least one component of the appliance, and determining a threshold value (Vs) of the said datum beyond which a risk of malfunction of the component may occur, b2) monitoring the current value (Vc) of the said datum of an appliance in a user's site, c2) performing a maintenance operation on the appliance as soon as said current value (Vc) exceeds said threshold value (Vs), characterised in that step a2) comprises the sub-steps of: - obtaining a reference value (Vr) of the said datum, the reference value being an estimated lifetime of the at least one component; - obtaining information for one and the same component of several identical or similar appliances in users' sites, wherein the information obtained comprises operating data and maintenance data, wherein the operating data comprises parameters of the identical or similar appliances and anomalies detected in the identical or similar appliances, and wherein the parameters are measured by sensors fitted to the identical or similar appliances and/or metered by meters fitted to the identical or similar appliances; and - calculating said threshold value (Vs) on the basis of said reference value (Vr) and the said information. a2) identifying a datum representative of the lifetime of at least one component of the appliance, and determining a threshold value (Vs) of the said datum beyond which a risk of malfunction of the component may occur, b2) monitoring the current value (Vc) of the said datum of an appliance in a user's site, c2) performing a maintenance operation on the appliance as soon as said current value (Vc) exceeds said threshold value (Vs), characterised in that step a2) comprises the sub-steps of: - obtaining a reference value (Vr) of the said datum, the reference value being an estimated lifetime of the at least one component; - obtaining information for one and the same component of several identical or similar appliances in users' sites, wherein the information obtained comprises operating data and maintenance data, wherein the operating data comprises parameters of the identical or similar appliances and anomalies detected in the identical or similar appliances, and wherein the parameters are measured by sensors fitted to the identical or similar appliances and/or metered by meters fitted to the identical or similar appliances; and - calculating said threshold value (Vs) on the basis of said reference value (Vr) and the said information. - obtaining a reference value (Vr) of the said datum, the reference value being an estimated lifetime of the at least one component; - obtaining information for one and the same component of several identical or similar appliances in users' sites, wherein the information obtained comprises operating data and maintenance data, wherein the operating data comprises parameters of the identical or similar appliances and anomalies detected in the identical or similar appliances, and wherein the parameters are measured by sensors fitted to the identical or similar appliances and/or metered by meters fitted to the identical or similar appliances; and - calculating said threshold value (Vs) on the basis of said reference value (Vr) and the said information.