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 TM5-4120-383-14
Table 4-2.
TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Make continuity check of TEMPERATURE SELECTOR
Step 5.
(See para 4-22 and
switch or MODE SELECTOR switch.
4-24.)
Replace bad switch.
Inspect heaters and wiring for loose connections or
Step 6.
damage. (See para 4-35.)
Tighten connections and fix bad wiring.
Replace
bad heater elements.
Check continuity of heater relay coils.
Step 7.
(See para
4-29.)
Replace bad relay.
Check operation of heater high-temperature cutout
Step 8.
It should open when
thermostatic switch.
(See para 4-34.)
temperature rises above setting.
Replace bad thermostatic switch.
EXCESSIVE NOISE.
10.
Step 1.
Check evaporator or condenser fan for vibration.
Tighten fans on shafts.
Tighten all mounting
screws.
Step 2.
Check evaporator or condenser fan motor for wear,
as indicated by noisy operation or excessive side
or end play.
(See para 4-33 and 4-36.)
(Refer to direct
Replace worn or bad motor.
support maintenance for repairs.)
Listen for compressor knocks or chatter.
Step 3.
Stop air conditioner and report condition to
direct support maintenance.
436
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