Method of diagnosing level sensor failure in fuel cell water trap and control unit using the same

A control unit using a method of diagnosing level sensor failure in a fuel cell water trap, the control unit comprising:

• a processor;
• and
• a memory configured to store computer readable commands therein, wherein the processor is configured to cause the control unit to:
• determine whether a water level of a level sensor is changed in a fuel cell water trap;
• add, based on a result of the determination, an amount of charge that is based on an operating time, compare the added amount of charge with a preset threshold amount of charge;
• forcibly open a drain valve based on whether a channel voltage of a specific channel is abnormal as the result of the comparison;
• and
• diagnose a failure of the level sensor based on whether the channel voltage of the specific cell is recovered as a normal state when the drain valve is opened.