Domestic product

A domestic appliance comprising a housing 1, apparatus 4,40 and electrical control circuit 9 required for the domestic appliance to perform its function, at least one sensor 14,15 sensing the status of said apparatus, a connector port 20 in communication with the exterior of the appliance, capable of physically restraining or retaining a module (30,Fig.2) and electronic connectors (23,Fig.2) within said port for connecting to the module, wherein the electronic connectors are also connected to receive sensor data, the module (30,Fig.2) capable of physical engagement with the port 20 and with electrical connectors (33,Fig.2) for coupling to the connectors (23,Fig.2) of the port, an output device (34, 35 Fig.2), and a processor (36,Fig.2) for analysing data received at the connector port in order to identify defects and to signal any defects via the output device. The output device may be a wireless communications device or a display. The module processor may analyse data received at the connector port to identify characteristics indicative of a defect and wirelessly transmit the characteristics.