The invention relates to a control module (13) for an electric appliance (10), comprising a printed circuit board (19) whereon electrical and electronic components (26) are mounted along with at least one power transistor (18) fixed to a first region (20) of the printed circuit board (19) and comprising a drain (D) connected to a first electrically conductive track (22) of said first region (20) and a source (S) connected to a second electroconductive track (23) of a second region (21) of the printed circuit board (19). At least one opening (27) forms a material discontinuity between the first and second regions (20, 21) of the printed circuit board (19), said opening (27) being arranged between the first and second conductive tracks (22, 23).