Trouble locating and clearing procedures (continued) 1-65
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Repairing and replacing NT3X90AB cooling units
(continued)
Summary of Repairing and replacing NT3X90AB cooling units
This flowchart summarizes the
procedure.
Use the instructions that follow this
flowchart to perform the
procedure.
Start
Dirty
filter?
Air flow
sensor
that has
faults?
Y
N
N
Y
Clean or
replace filter
Replace air
flow sensor
Replace fan or
harness
End
Replace
inverter
Replace fuse
FAN FAIL
lamp out?
Y
Blown fuse?
N
Y
Y
Repair
unit on
premises?
Y
Replace
cooling unit
Next level of
support
FAN FAIL
lamp out?
N
Y
Y
N
Row of
fans that
have
faults?
N
N
N
Harness or
single fan
that has
faults?