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TM 5-4120-377-14
TABLE 3-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Step 4.
Step 5.
Step 6.
Reset (PUSH) PRESSURE CUT-OUT switch(s) and restart unit.
If unit does not start contact organizational maintenance.
Check to be sure that condenser fan is operating. (Air being discharged from condenser air
outlet.)
If fan is not operating, shut unit off and contact organizational maintenance.
With unit operating in COOL mode, check condition of refrigerant in sight glass,
If indicator color is in the yellow zone or numerous bubbles appear in the window, turn
selector switch to OFF and contact organizational maintenance.
Check to be sure that lower front panel is not loose or missing.
Lower front panel must be secure.
4. REDUCED COOLING CAPACITY.
Step 1.
Step 2.
Step 3.
Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Check operation of TEMPerature control thermostat.
Set control at maximum DECREASE; then, if condition improves, adjust properly.
TS4120-377-14/3-T31-7
Check that the louvers in the conditioned air inlet and outlet grilles are properly adjusted. (Must be
open.)
Adjust louvers properly.
3-5
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