Refrigerator

A refrigerator comprising:

• an inner case defining a storage space and including a rear wall;
• a cool air duct to guide a flow of air within the storage space, the cool air duct defining a heat-exchange space together with the rear wall of the inner case;
• an evaporator disposed in the heat-exchange space between the rear wall of inner case and the cool air duct;
• a bypass passage disposed at the cool air duct, the bypass passage to allow a portion of the air flow to bypass the evaporator;
• a sensor disposed in the bypass passage, the sensor comprising a sensor housing, a sensor printed circuit board (PCB) accommodated in the sensor housing, a heat generating element installed on the sensor PCB to generate heat when current is applied, a sensing element to sense a temperature of the heat generating element, and a molding material filled in the sensor housing to surround the sensor PCB, the heat generating element and the sensing element;
• a defroster to remove frost generated on a surface of the evaporator;
• and
• a controller configured to control the defroster based on an output value of the sensor.