A fan might be failing. Before replacing any field replaceable units (FRUs), verify that all cables are seated correctly.

Replace in order, one at a time, starting with the primary unit and then the secondary units, use the following table to determine the failing fan and location.

Unit reference code, CCIN, or FFC	Type and model	Part number	Description	Location code
7610, 7611	9406-MMA, 9117-MMA	39J0859	Fan assembly	Un-A1
7620, 7621	9406-MMA, 9117-MMA	39J0859	Fan assembly	Un-A2
7650, 7651	5790, 7311-D11	03N6069	Fan assembly	Un-A1
7610, 7611	0595, 5095, 7310-D20	39J1176	Fan assembly	Un-A1
7620, 7621	0595, 5095, 7310-D20	39J1176	Fan assembly	Un-A2
7630, 7631	0595, 5095, 7310-D20	39J1176	Fan assembly	Un-A3
7640, 7641	0595, 5095, 7310-D20	39J1176	Fan assembly	Un-A4
7610, 7611	5094	39J5235	Air-moving device (fan)	Un-B01
7620, 7621	5094	39J5235	Air-moving device (fan)	Un-B02