Diagnosis system for household electric appliances

A diagnosis system for household electric appliances, such as refrigerators, freezers, and others, presenting multiple loads ( 10 ) energized by switches ( 20 ) commanded by electronic controls ( 30 ) coupled to a command module ( 50 ), which energizes the loads ( 10 ) and an interface ( 80 ). The system comprises: a voltmeter ( 60 ) to measure a first voltage (Voff) in the inlet of the loads ( 10 ) with the switches ( 20 ) opened, and a second voltage (Vres, Vlamp, Vcomp) in the inlet of each load ( 10 ) with the respective switch ( 20 ) closed; a control unit ( 70 ) for processing the values of the first voltage (Voff) and of each second voltage (Vres, Vlamp, Vcomp), indicating in the interface ( 80 ) the existence of failure in the command module ( 50 ), in the switches ( 20 ), and in the respective electronic controls ( 30 ) thereof, and interrupting the sequence of tests, in case any second voltage (Vres, Vlamp, Vcomp) presents a value that is equal to or higher than that of the first voltage (Voff).