Wire unit of the fan disconnected.

Check if the wire unit of the fan is connected with the projector wiring. See reference 1 image.

Check if the wiring of the fan is connected with the signal backplane. See reference 11 image.

Blocked fan.

Unblock the fan. Ensure that the fan can turn freely.

Damaged wire unit.

Check if the wire unit of the fan is not damaged. Repair if possible, otherwise replace with new one.

Fan end of life.

Replace the fan. See "Replacement of the Formatter fan(s)".

Malfunction Fan Control Board

Replace the Fan Control Board. See "Replacement of a Card Cage board".

Other fans are also not spinning.

Replace the SMPS Board. See "Replacement of the SMPS board".

Defect Signal Backplane

Replace the Signal Backplane.