Trouble locating and clearing procedures (continued) 1-53
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Repairing and replacing NT3X90AA cooling units
(continued)
Summary of Repairing and replacing NT3X90AA cooling units
Start
Dirty
filter?
Clean or
replace filter
Two
affected
frames?
Repair
unit on
premises?
N
Replace
cooling unit
Replace
inverter
Y
N
N
Repair harness
or replace fan
This flowchart summarizes the
procedure.
Use the instructions that follow this
flowchart to perform the
procedure.
Harness
or fan has
faults?
Air flow
sensor
has
faults?
Replace air
flow sensor
N
Y
Y
N
End
Next level of
support
Y
Y
FAN FAIL
lamps
out?
N
Y
N
Repair
unit on
premises?
Y
Replace
cooling unit