Provided are a home appliance and a method of outputting a signal sound for diagnosis. The home appliance includes: a selection unit for receiving a diagnosis command on the home appliance from a user; a memory for storing diagnosis data on the home appliance; a controller for processing the diagnosis data stored in the memory in order to generate a packet according to a diagnosis command input through the selection unit; a conversion unit for generating a frame including a combination of symbols, which respectively correspond to four different carrier frequencies, on the basis of data constituting the packet, according to a Quadrature Frequency Shift Keying (QFSK) method.