An air conditioning apparatus using a heat medium containing at least one of cold water and hot water, the air conditioning apparatus comprising: a heat source device; a heat exchanger configured to exchange heat between the heat medium and air; a flow rate control valve configured to control a flow rate at which the heat medium is supplied to the heat exchanger; a temperature sensor configured to detect a temperature of the heat medium discharged from the heat exchanger; and a failure determination unit configured to detect presence or absence of an abnormality in a flow path of the heat medium based on the temperature detected by the temperature sensor and a commanded degree of opening for the flow rate control valve, wherein when the temperature detected by the temperature sensor is higher than a determination temperature during cooling operation, the failure determination unit is configured to determine that there is an abnormality in the flow path, characterized by the air conditioning apparatus further comprising: a fan configured to blow air to the heat exchanger; and a current sensor configured to detect a current of a motor configured to drive the fan, wherein, when the temperature detected by the temperature sensor is lower than a second operation, the failure determination unit is configured to determine that there is an abnormality in an air passage to the heat exchanger, wherein when a current value of the motor is outside a current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that the motor has failed, and when the current value of the motor is inside the current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that air flow resistance in a fin portion of the heat exchanger has increased.. a heat source device; a heat exchanger configured to exchange heat between the heat medium and air; a flow rate control valve configured to control a flow rate at which the heat medium is supplied to the heat exchanger; a temperature sensor configured to detect a temperature of the heat medium discharged from the heat exchanger; and a failure determination unit configured to detect presence or absence of an abnormality in a flow path of the heat medium based on the temperature detected by the temperature sensor and a commanded degree of opening for the flow rate control valve, wherein when the temperature detected by the temperature sensor is higher than a determination temperature during cooling operation, the failure determination unit is configured to determine that there is an abnormality in the flow path, characterized by the air conditioning apparatus further comprising: a fan configured to blow air to the heat exchanger; and a current sensor configured to detect a current of a motor configured to drive the fan, wherein, when the temperature detected by the temperature sensor is lower than a second operation, the failure determination unit is configured to determine that there is an abnormality in an air passage to the heat exchanger, wherein when a current value of the motor is outside a current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that the motor has failed, and when the current value of the motor is inside the current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that air flow resistance in a fin portion of the heat exchanger has increased.. a fan configured to blow air to the heat exchanger; and a current sensor configured to detect a current of a motor configured to drive the fan, wherein, when the temperature detected by the temperature sensor is lower than a second operation, the failure determination unit is configured to determine that there is an abnormality in an air passage to the heat exchanger, wherein when a current value of the motor is outside a current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that the motor has failed, and when the current value of the motor is inside the current normal determination range, and the temperature detected by the temperature sensor is lower than the second determination temperature, the failure determination unit is configured to determine that air flow resistance in a fin portion of the heat exchanger has increased..