Fuel cell system

A fuel cell system comprising:

• a fuel cell;
• a cooling system having a refrigerant pump configured to deliver a refrigerant to the fuel cell;
• a rotating speed acquisition part configured to acquire a rotating speed of the refrigerant pump;
• a power consumption acquisition part configured to acquire a power consumption of the refrigerant pump;
• and
• a controller configured to receive a rotating speed acquired by the rotating speed acquisition part and control the refrigerant pump,
• wherein the controller has stored therein a predetermined correspondence between rotating speeds of the refrigerant pump and power consumption threshold values,
• the controller is configured to execute a refrigerant leak decision process for deciding presence or absence of a refrigerant leak while executing constant rotating speed control for the refrigerant pump, and
• in the refrigerant leak decision process, with reference to the correspondence by using a rotating speed value acquired by the rotating speed acquisition part, the controller determines a power consumption threshold value corresponding to the rotating speed value, and decides that a refrigerant leak has occurred if a power consumption value acquired by the power consumption acquisition part is equal to or lower than the power consumption threshold value corresponding to the rotating speed value.