Section II TROUBLESHOOTING

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

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