Cause : Auxiliary fan not running comes when an auxiliary cooling fan (connected to the fan connectors on the control unit) is stuck or disconnected.

1. The auxiliary code identifies the fan (1: Auxiliary fan 1, 2: Auxiliary fan 2).
2. Check that the auxiliary fan supervision selection in parameter 95.21 HW options word 2 matches the hardware.
3. Make sure the front cover of the drive module is in place and tightened. Check auxiliary fan(s) and connection(s).
4. Replace faulty fan.