To provide a washing and drying machine capable of preventing a failure of an electric part or the like by surely detecting bubbles generated during washing without erroneous detection due to adhesion of lint and yarn waste.
A bubble detection sensor 70 for detecting bubbles advancing into a hot air blowing passage 49 from a rotary drum 31 to be a washing tub comprises light emitting elements and light receiving elements in which optical axes are disposed to be substantially orthogonal to each other. Control means stores a light emitting current value to be a first set light receiving voltage, compares a light receiving voltage when light is emitted by the light emitting current value with a second set light receiving voltage to detect the presence or absence of bubbles, operates a drain valve to be drain means to drain water when detecting bubbles and eliminates the bubbles.
KONDO SHINJI
Daisuke Nagano
Kentaro Fujii