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TM 9-4120-389-14
Table 4-2. UNIT TROUBLESHOOTING- (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a.
If color is yellow or a light hue of chartreuse, or if numerous bubbles appear, turn air
conditioner OFF. Contact your supervisor and Direct Support Maintenance.
b.
If color is green or a dark hue of chartreuse, but has a milky appearance, or more than an
occasional bubble appears, thoroughly clean the entire condenser section.
Step 8.
Check air flow out of evaporator louver. If air volume is low:
Adjust evaporator intake louvers.
Clean or replace air conditioner filter. (See para. 4-19).
Clean evaporator coil. (See para. 4-34) and entire evaporator system.
Step 9.
Check operation of temperature control switch.
Inspect sensing bulb and capillary for damage or leakage. (See para. 4-43). Replace
switch if damage or leakage is found.
Test temperature control switch (See para. 4-43). Replace defective switch.
Step 10.
Check if unit is suspected to be stuck in by pass cycle.
Contact Direct Support Maintenance.
5.
REDUCED HEATING CAPACITY.
Step 1.
Check that all doors, windows, and other openings in the room or enclosure are tightly
closed.
Tightly close all openings.
Step 2
If control panel is remotely located, check to be sure that sensing bulb is not near a light bulb
or some type of heat producing equipment.
Turn off or move heat source, or move the remote control panel.
4-52
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