Fault detection device and method for electrical appliance

A fault detection device includes an interface electrically connected to an electrical instrument (100) to transfer commercial power to the electrical instrument (100), transmit a command for driving one of a plurality of loads (131-134) included in the electrical instrument to the electrical instrument, and detect current flowing in one of the plurality of loads (131-134) of the electrical instrument (100); and a terminal configured to receive a current signal corresponding to the current flowing in one of the plurality of loads (131-134) from the interface, determine whether the one load (131-134) has a fault on the basis of the received current signal and display whether the load (131-134) has a fault. A faulty load is determined by detecting current of only a load suspected to have a fault when a fault is generated in the electrical instrument (100) so as to improve fault detection accuracy.