Fan speed too low due to wiring issue.

1. Check fan wire connection on the Controller Board of the Cooler Module (reference 2, image).

2. Check fan wiring connection at the fan side. In order to do so, remove the fan (brown wiring) from the module. See procedure "Removing a Cooling Unit fan".

Fan speed too low due to fan damage.

1. Remove the fan from the cooler module and check if the fan (red wiring) is not blocked.

2. If not blocked, replace the fan.

For removing and replacing the fan, see procedure "Removing a Cooling Unit fan".

Defective Cooler Control Board.

1. Replace the main control board. See procedure "Replacing the Cooling Unit control boards".

2. If problem persists, replace the entire Cooler unit.