TM9-4120-400-14
S e c t i o n V TROUBLESHOOTING
USE OF TROUBLESHOOTING TABLE..
Table 4-2 contains troubleshooting information useful to unit maintenance technicians in diagnosing and
correcting malfunctions or unsatisfactory operation of the air conditioner.
The Troubleshooting Table lists the common malfunction symptoms and unsatisfactory performance
a.
characteristics technicians are most likely to encounter. Included are test and inspection steps to be
followed to determine the cause and the corrective action(s) that should be performed for each possible
cause listed.
The technicians should first find the malfunction symptom or unsatisfactory performance characteristic in
b.
the table which most closely describes the immediate situation. Perform the test and inspections, and
corrective action steps in the order in which they are listed.
This manual cannot list all possible situations which may be encountered, nor can it list all test and
c.
inspection, and corrective action steps which may be taken. If a condition is encountered which cannot be
resolved within the capabilities and experience of unit maintenance personnel, assistance should be
requested from direct support maintenance.
SYMPTOM INDEX
Trouble
Malfunction No.
AIR CONDITIONER
Does Not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Insufficient Cooling . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operates Continuously on Cooling Cycle. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fails To Heat . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Excessive Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATOR
Evaporator Fan
Does Not Start . . . . . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stops During Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Air Output Volume Low. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONDENSER
Condenser Fan Fails to Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser Air Outlet Volume Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPRESSOR
Compressor Will Not Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Short Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Starts But Goes Out On Overload . . . . . . . . . . . . . . . . . . . . . . . .
