TM 9-4120-407-14
CHAPTER 4
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
SECTION I DIRECT SUPPORT TROUBLESHOOTING
4-1. USE OF TROUBLESHOOTING TABLE.
a. The troubleshooting table, Table 4-1, lists the most common malfunctions that you may find during the
operation or maintenance of the air conditioner. You should perform the tests or inspections and corrective
actions in the order listed.
b. For specific malfunction, perform the troubleshooting procedures listed in Table 3-3 before performing
the procedures listed in Table 4-1.
c. This manual cannot list all malfunctions that may occur. However, listed are the most common tests
or inspections and corrective actions.
d. Notify your supervisor if a malfunction or corrective action is not addressed or incorrect.
SYMPTOM INDEX
MALFUNCTION NO.
TROUBLE
1
Compressor will not operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Not cooling when operated in cool mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Reduced cooling capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4-1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. COMPRESSOR WILL NOT OPERATE.
Test compressor per paragraph 4-31.
If compressor is defective, replace it per paragraph 4-31.
2. NOT COOLING WHEN OPERATED IN COOL MODE.
Test the equalizing solenoid per paragraph 4-27.
If the solenoid is defective, replace it per paragraph 4-27.
4-1
