An ice making system comprising: a tank for storing a medium to be cooled; an ice making machine that is configured to cool the medium to be cooled and makes ice; a pump that is configured to circulate the medium to be cooled between the tank and the ice making machine ; a de-icing mechanism that is configured to perform a de-icing operation of heating and melting the medium to be cooled in the ice making machine ; and a control device configured to control operations of the ice making machine , the pump , and the de-icing mechanism; wherein the ice making machine includes: a cooling chamber in which to cool the medium to be cooled; a blade mechanism configured to rotate in the cooling chamber to disperse the ice; and a detector configured to detect a locked state of the blade mechanism , wherein the control device is configured to operate the de-icing mechanism when the detector detects the locked state of the blade mechanism , characterized in that the control device is configured to stop the blade mechanism when the detector detects the locked state of the blade mechanism , and in that the ice making system further comprises a temperature sensor for detecting a temperature of the medium to be cooled discharged from the cooling chamber , wherein the control device is configured to stop the de-icing operation when the temperature detected by the temperature sensor for detecting a temperature of the medium to be cooled discharged from the cooling chamber exceeds a predetermined temperature. a tank for storing a medium to be cooled; an ice making machine that is configured to cool the medium to be cooled and makes ice; a pump that is configured to circulate the medium to be cooled between the tank and the ice making machine ; a de-icing mechanism that is configured to perform a de-icing operation of heating and melting the medium to be cooled in the ice making machine ; and a control device configured to control operations of the ice making machine , the pump , and the de-icing mechanism; wherein the ice making machine includes: a cooling chamber in which to cool the medium to be cooled; a blade mechanism configured to rotate in the cooling chamber to disperse the ice; and a detector configured to detect a locked state of the blade mechanism , wherein a cooling chamber in which to cool the medium to be cooled; a blade mechanism configured to rotate in the cooling chamber to disperse the ice; and a detector configured to detect a locked state of the blade mechanism , wherein the control device is configured to operate the de-icing mechanism when the detector detects the locked state of the blade mechanism , characterized in that the control device is configured to stop the blade mechanism when the detector detects the locked state of the blade mechanism , and in that the ice making system further comprises a temperature sensor for detecting a temperature of the medium to be cooled discharged from the cooling chamber , wherein the control device is configured to stop the de-icing operation when the temperature detected by the temperature sensor for detecting a temperature of the medium to be cooled discharged from the cooling chamber exceeds a predetermined temperature. <EOS>