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 TM5-4120-384-14
TROUBLESHOOTING-Continued
Table
4-2.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
INSUFFICIENT COOLING.
4.
Step
1.
Check to see that MODE SELECTOR switch is properly
positioned.
Set switch to COOL.
Step
2.
Check sight-glass liquid level indicator that
Yellow, milky
refrigerant is colorless and clear.
or bubbly refrigerant indicates low level or
excessive moisture.
Report
condition
to
direct
support
maintenance.
Inspect
coil
for
dirt.
Step
3.
Clean
coil
with
25-30
psi
compressed
air.
Step
4.
Inspect evaporator
return
air
filter
for
dirt.
(See para 4-13.)
Clean
filter.
Step
5.
Check if TEMPERATURE SELECTOR switch is set
(See para 4-22.)
incorrectly or is defective.
Adjust setting or replace
switch,
or
other
corrective action.
Step
6.
Check if supply air
outlet louver is bent
or
stuck
in closed position.
(See para 4-14.)
Repair
or
replace
louver.
Observe evaporator fan motor
for
worn
or
defective
Step
7.
(See para 4-32.)
condition.
Report fault to
direct
support
maintenance,
or
replace motor.
Step
8.
Check if evaporator
fan
is
loose
or
defective.
(See para 4-32.)
Tighten
setscrew
or
replace
fan.
4-32
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