TM 9-4120-408-14
SECTION III. OPERATOR TROUBLESHOOTING PROCEDURES
3-4. OPERATOR TROUBLESHOOTING.
The malfunction index lists malfunctions that may be observed by you as the operator. Use the malfunction index to
locate faults listed in Table 3-1. Table 3-1 lists common malfunctions that you may find with your equipment. After
locating the listed malfunction, perform the test/inspections and corrective actions in the order listed in Table 3-1. The
malfunction index and Table 3-1 cannot list all the malfunctions that may occur, all the tests and inspections needed to
find the fault, or all the corrective actions needed to correct the fault. If the equipment malfunction is not listed or actions
listed do not correct the fault, notify your supervisor.
OPERATOR MALFUNCTION INDEX
Malfunction
Malfunction
Number in Table
Air Conditioner Fails to Start in Any Mode ............................................................................
1
Insufficient Cooling ...............................................................................................................
2
Air Conditioner Stops Operating ............................................................................................
3
High Pressure Warning Light on Control Module is Lit ..........................................................
4
Low Pressure Warning Light on Control Module is Lit ...........................................................
5
Air Filter Warning Light on Control Module is Lit ...................................................................
6
Condensate Drain Warning Light on Control Module is Lit .......................................................
7
Table 3-1. Operator Troubleshooting Table
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Air Conditioner Fails to Start in Any Mode.
Ensure all power connections to the control module, condenser assembly, and evaporator assembly are secure. Inspect
all external power cables for damage.
WARNING
Do not work on equipment with power connected. Electrocution hazard is present. Failure to
obey this warning may result in death or serious personal injury .
a Disconnect, clean connectors, and reconnect all connectors or connect power from a source supplying 28 vdc.
b Notify unit maintenance.
3-2
