What does an IDG fault light signify?

The IDG (Integrated Drive Generator) fault light indicates a specific issue related to the generator system's operation. In the context of this question, the correct interpretation is that the IDG fault light signifies a condition where there has been an overheating situation noted in the generator, referred to as HOTLOP (hot line operation).

When the IDG is operating at a temperature that exceeds its normal operating range, it may trigger this fault light to alert the crew that there is a potential risk of damage if the condition persists. The HOTLOP indication is critical because it helps ensure that operators are aware of any anomalies that could lead to generator failure, prompting them to take appropriate actions to protect the integrity of the electrical supply.