Clothing dryer and blockage detection method thereof

A dryer, comprising:

• a drum to accommodate a substance to be dried;
• a temperature sensor to detect a temperature at an entry of hot air into the drum;
• a heater to supply the hot air to the inside of the drum;
• an exhaust duct to discharge the hot air passed through the drum;
• a thermostat to control power applied to the heater while operating according to a temperature of the heater;
• and
• a control unit configured to detect a degree of a blockage of the exhaust duct based on the detected temperature at the entry of hot air into the drum and an operation of the thermostat,
• wherein the temperature sensor is a thermistor to detect the temperature of the hot air being introduced to the inside of the drum,
• wherein the control unit, when a rate of temperature change of the thermistor exceeds a reference rate of change at a predetermined point in time, determines the point in time as a point in time of the operation to detect the temperature of the entry of the drum and the time, and
• wherein the point in time of the operation comprises a first point in time of the operation when the heater is turned OFF according to the operation of the thermostat, and a second point in time of the operation when the heater is turned ON after being turned OFF according to the operation of the thermostat.