TM 9-4120-404-14
Section V. UNIT TROUBLESHOOTING PROCEDURES.
3-15. GENERAL.
a. This section contains troubleshooting information for locat ing and correcting most of the operating troubles which
may develop in the air conditioner. Each malfunction for an individual component, unit, or system is followed by a list of
tests or inspections which will help you to determine corrective actions to take. You should perform the tests/inspections
and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
c. Table 3-3 lists the common malfunctions which you may find during the operation or maintenance of the air
conditioner or its components. You should perform the tests/inspections and corrective actions in the order listed.
WARNING
HIGH VOLTAGE
is used in operation of this equipment.
DEATH ON CONTACT
may result if personnel fail to observe safety precautions.
Never work on electrical equipment unless there is another person nearby who is
familiar with operation and hazards of equipment and who is competent in
administering first aid. When technician is aided by operators, he must warn them
about dangerous areas.
Whenever possible, input power supply to equipment must be shut off before
beginning work. When working inside, after power has been turned off, always
ground every part before touching it. Be careful not to contact high voltage
connections when installing or operating this equipment.
Whenever nature of operation permits, keep one hand away from equipment to
reduce hazard to current flowing through vital organs of body. Do Not operate
equipment without all guards, louvers, and covers in place and tightly secured.
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