FUEL CELL SYSTEM AND METHOD OF OPERATING THE SAME

A fuel cell system includes: a fuel cell unit 50; a first water tank 41 configured to store at least one of condensation water, cooling water, and stored hot water; a second water tank 43 configured to store at least one of the condensation water, the cooling water, and the stored hot water; a first water amount sensor 42 configured to detect the amount of water in the first water tank; a second water amount sensor 44 configured to detect the amount of water in the second water tank; a first water moving mechanism 60 configured to move water in the first water tank to the second water tank; and a controller 40 configured to perform control of the first water moving mechanism. The controller performs control of the first water moving mechanism and thereafter performs an abnormality handling operation in at least one of the following cases: a case where the amount of water detected by the first water amount sensor has not decreased as compared to before starting to perform the control of the first water control mechanism; and a case where the amount of water detected by the second water amount sensor has not increased as compared to before starting to perform the control of the first water control mechanism, the abnormality handling operation including at least one of a determination operation to determine that there is an abnormality, outputting of an abnormality signal, and stopping of the system's operation.