Cause : Fan operating time reached or exceeded comes when The maximum operating time of the fan in the Control Unit has either been reached or exceeded.

Alarm value (r2124, interpret decimal):

0: The maximum fan operating time is 500 hours.
1: The maximum fan operating time has been exceeded (50000 hours).

• Replace the fan in the Control Unit and reset the operating hours counter to 0 (p3961 = 0).