A refrigeration cycle apparatus comprising: a refrigerant circuit in which a compressor, a flow switching device, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected via a refrigerant pipe; a high-side pressure sensor disposed on a discharge side of the compressor, and configured to detect a high-side pressure of refrigerant; an outdoor fan configured to supply air to the outdoor heat exchanger; a fan driving unit configured to drive the outdoor fan; and a controller configured to control a rotation speed of the fan driving unit, wherein the controller includes a pressure prediction unit configured to predict, based on the high-side pressure detected by the high-side pressure sensor, a predicted value (Ppre) of high-side pressure at an elapse of a set time, characterized by an intermittent fan control unit configured to, when the fan driving unit is running at a set lower limit rotation speed, and when the detected high-side pressure is below a target value, control the fan driving unit to perform an intermittent operation, the intermittent operation being performed by setting an ON time (Ton), during which the outdoor fan is driven, and an OFF time (Toff), during which the outdoor fan is stopped, such that the predicted value (Ppre) predicted by the pressure prediction unit approaches the target value; wherein the refrigeration cycle apparatus further comprises: a board temperature sensor configured to detect a board temperature of the controller, wherein the outdoor fan is configured to supply air to the outdoor heat exchanger, and cool the controller, and wherein during the intermittent operation, the intermittent fan control unit is configured to correct one of the set ON time (Ton) and the set OFF time (Toff) such that the board temperature detected by the board temperature sensor is lower than a set threshold. a refrigerant circuit in which a compressor, a flow switching device, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected via a refrigerant pipe; a high-side pressure sensor disposed on a discharge side of the compressor, and configured to detect a high-side pressure of refrigerant; an outdoor fan configured to supply air to the outdoor heat exchanger; a fan driving unit configured to drive the outdoor fan; and a controller configured to control a rotation speed of the fan driving unit, wherein the controller includes a pressure prediction unit configured to predict, based on the high-side pressure detected by the high-side pressure sensor, a predicted value (Ppre) of high-side pressure at an elapse of a set time, characterized by an intermittent fan control unit configured to, when the fan driving unit is running at a set lower limit rotation speed, and when the detected high-side pressure is below a target value, control the fan driving unit to perform an intermittent operation, the intermittent operation being performed by setting an ON time (Ton), during which the outdoor fan is driven, and an OFF time (Toff), during which the outdoor fan is stopped, such that the predicted value (Ppre) predicted by the pressure prediction unit approaches the target value; wherein the refrigeration cycle apparatus further comprises: a board temperature sensor configured to detect a board temperature of the controller, wherein the outdoor fan is configured to supply air to the outdoor heat exchanger, and cool the controller, and wherein during the intermittent operation, the intermittent fan control unit is configured to correct one of the set ON time (Ton) and the set OFF time (Toff) such that the board temperature detected by the board temperature sensor is lower than a set threshold. a pressure prediction unit configured to predict, based on the high-side pressure detected by the high-side pressure sensor, a predicted value (Ppre) of high-side pressure at an elapse of a set time, characterized by an intermittent fan control unit configured to, when the fan driving unit is running at a set lower limit rotation speed, and when the detected high-side pressure is below a target value, control the fan driving unit to perform an intermittent operation, the intermittent operation being performed by setting an ON time (Ton), during which the outdoor fan is driven, and an OFF time (Toff), during which the outdoor fan is stopped, such that the predicted value (Ppre) predicted by the pressure prediction unit approaches the target value; wherein the refrigeration cycle apparatus further comprises: a board temperature sensor configured to detect a board temperature of the controller, wherein the outdoor fan is configured to supply air to the outdoor heat exchanger, and cool the controller, and wherein during the intermittent operation, the intermittent fan control unit is configured to correct one of the set ON time (Ton) and the set OFF time (Toff) such that the board temperature detected by the board temperature sensor is lower than a set threshold. a board temperature sensor configured to detect a board temperature of the controller, wherein the outdoor fan is configured to supply air to the outdoor heat exchanger, and cool the controller, and wherein during the intermittent operation, the intermittent fan control unit is configured to correct one of the set ON time (Ton) and the set OFF time (Toff) such that the board temperature detected by the board temperature sensor is lower than a set threshold.