Fuel cell system

A fuel cell system comprising:

• a fuel cell that generates electric power;
• a plurality of electrical components that are supplied with the electric power generated by the fuel cell;
• a refrigerant circuit that cools the fuel cell using a refrigerant;
• a tank that is connected to the refrigerant circuit, is configured to store the refrigerant, and is replenished with the refrigerant;
• an insulation resistance value detecting unit configured to detect an insulation resistance value of the fuel cell system;
• and
• an identification unit configured to identify at what position of the fuel cell system the insulation resistance value has decreased when it is detected that the insulation resistance value has decreased,
• wherein the insulation resistance value detecting unit is configured to perform a process of determining whether a decrease in insulation resistance value is temporary when the identified position is the fuel cell and to determine that there is no failure requiring repair when the decrease in insulation resistance value is temporary.