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Chapter 4. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Table 4-1. TROUBLESHOOTING - 506780085
TM 5-4120-359-14
Section II TROUBLESHOOTING
4-2. USE OF TROUBLESHOOTING TABLE
Table 4-1 contains troubleshooting information useful to direct support maintenance technicians in diagnosing and
correcting malfunctions or unsatisfactory operation of the air conditioner.
a. The troubleshooting table lists the common malfunction symptoms and unsatisfactory performance characteristics
technicians are most likely to encounter; test and inspection steps to be followed to determine the cause; and the
corrective action(s) that should be performed for each cause listed.
b. First find the malfunction symptom or unsatisfactory performance characteristic in the table which most closely
describes the immediate situation; then perform the test and inspections, and corrective action steps in the order in which
they are listed.
c.  Whenever performing troubleshooting procedures or electrical equipment, point-to-point continuity should be
tested in accordance with the electrical schematic, figure 4-2, the wiring diagram, figure 4-3 and the wire list, table 4-2.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be lethal.
Table 4-1. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
AIR CONDITIONER WILL NOT START IN ANY MODE
Step 1.
Press run indicator light.
If light illuminates, go to step 6.
Step 2.
Check to see if air conditioner power circuit breaker in shelter has been turned off or tripped.
Reset circuit breaker.
Step 3.
Check to see if power cable to air conditioner has been disconnected.
Connect power cable.
Step 4.
Check to see if remote control cable has been disconnected.
Connect remote control cable.
CAUTION
Provided that military operational considerations allow the time, it is desirable, if
the power has been disconnected for an unknown period of time, to wait six hours
after reconnection before starting in the COOL mode. (See the caution in table 3-1,
4-2 Change 3

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