Wire of the ICP fan disconnected from the Signal Backplane.

Remove the projector top cover and top cover plate. Look inside the compartment above the Card Cage to check if the wire unit (reference 1 image) is inserted in the Signal Backplane.

Blocked ICP fan.

Remove the projector top cover and top cover plate. Look inside the compartment above the Card Cage to check if the ICP fan is not blocked (reference 2 image). Unblock the fan. Ensure that the fan can turn freely.

Damaged wire.

Remove the projector top cover and top cover plate. Look inside the compartment above the Card Cage to check the wire of the ICP fan. Repair if possible, otherwise replace with new one. See service manual chapter "Replacement of the ICP fan".

Malfunction Cinema Control board.

Replace the Cinema Control board. See service manual chapter "Replacement of the Cinema Controller".

Fan end of life.

Replace the ICP fan. See service manual chapter "Replacement of the ICP fan".