1-56 Trouble locating and clearing procedures (continued)
297-8021-544 Standard 14.02 May 2001
Repairing and replacing NT3X90AA cooling units
(continued)
Note 1: A fan that does not work indicates a wiring harness, loose
connections, or a fan that requires replacement.
Note 2: The operation of all fans with a lit FAN FAIL lamp indicates a air
flow sensor that has faults.
13
Inspect the wiring harness for the cooling unit. Look for damage and/or a
loose connection at the fans or terminal blocks.
If
Do
fans work correctly but FAN
FAIL lamp remains on
step 33
one fan does not work
step 13
other than listed above
step 85
Air flow sensor switch
Fan