Environment Error: μC1 maximum supply voltage exceeded

What does 1 mean?

When LED Diag 1 is off and LED Diag 2 flashes with code 1 (400ms ON / 400ms OFF), it indicates that the internal supply voltage for microcontroller μC1 has exceeded its maximum permissible limit. This environment-related error signals an overvoltage condition, potentially risking damage to the μC1 or compromising its safety functions due to electrical stress.