Power unit: Fan operating time reached or exceeded

What does A30042 mean?

This alarm indicates that the cooling fan in the power unit has reached or exceeded its specified maximum operating hours (typically 500 hours), as configured in p0252. While the fan may still be operational, this serves as a preventative maintenance alert. Continuing to operate with an aged fan increases the risk of fan failure and subsequent overtemperature faults, potentially damaging the power unit.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify proper fan operation and airflow after replacement.