Which load bank control illuminates if the blower fails?

The blower fail indicator is specifically designed to illuminate when there is a failure in the blower system. This control is focused on monitoring the proper operation of the blower, which is crucial for maintaining the necessary airflow and cooling in load bank operations. If the blower fails, it can lead to overheating and potentially damage the load bank equipment; therefore, having a dedicated visual indication of this failure allows for immediate attention and corrective action.

Other options may relate to general warnings or other types of failures, but the blower fail indicator specifically tracks the functionality of the blower, making it the most appropriate choice for this scenario.