Environment Error: μC1 supply voltage below minimum

What does 2 mean?

When LED Diag 1 is off and LED Diag 2 flashes with code 2 (400ms ON / 400ms OFF), it indicates that the internal supply voltage for microcontroller μC1 has fallen below its minimum permissible value. This environment error suggests insufficient power delivery, which could lead to erratic behavior, component instability, or a complete shutdown of safety functions for μC1.