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 TM5-4120-384-14
TROUBLESHOOTING-Continued
Table
4-2.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Replace bad motor.
M a k e continuity check of TEMPERATURE SELECTOR
Step
5.
(See para 4-22
and
switch or MODE SELECTOR switch.
4-23.)
Replace
bad
switch.
Inspect
heaters and wiring
for
loose
connections
or
Step
6.
(See para 4-34.)
damage.
Replace
Tighten connections and
fix
bad
wiring.
bad heater elements.
(See
Check continuity
of
heater
coils.
Step
7.
Replace
bad
Check operation of heater high-temperature cutout
Step
8.
It should open when
thermostatic switch.
(See para 4-33.)
temperature rises above setting.
Replace bad thermostatic switch.
EXCESSIVE NOISE .
10.
Check
or
fan
for
vibration.
Step
1.
Tighten
all
mounting
Tighten
fans
on
shafts.
screws.
Check evaporator or condenser fan motor for wear,
Step
2.
as indicated by noisy operation or excessive side
or end play.
(See para 4-32 and 4-35.)
(Refer
to
direct
Replace worn or bad motor.
support maintenance for repairs.)
Listen
for
knocks
or
chatter.
Step 3.
Stop air conditioner and report
condition
to
direct support maintenance.
4-36
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