Wire unit Dowser disconnected (reference 1 image "Dowser connection").

Reconnect the dowser wire unit with the blue wire unit on the light processor unit (reference 1 image "Dowser connection").

Wire unit Dowser disconnected from the Signal Backplane (reference 2 image "Dowser connection".

Reconnect the blue wire unit of the Dowser with the Signal Backplane.

Blocked blade of the Dowser

Check if noting is blocking the blade of the Dowser. Do NOT force the blade from the open position to the closed position or vice versa.

Damaged wire unit of the Dowser

Try to repair the damaged wire unit. If not possible replace the Dowser unit. See "Replacement of the dowser (shutter)".

Malfunction motor of the Dowser unit

Replace the Dowser unit. See "Replacement of the dowser (shutter)".

Malfunction Fan Control board

Replace the Fan Control board. See "Removing a board in the card cage".