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TM 9-4120-428-14
0010 00
There are loose connections or damage to the heaters and the wiring.
CORRECTIVE ACTION
Inspect for loose connections or damage the heaters and wiring. If necessary,
tighten all loose connections, fix bad wiring, and replace bad heater elements.
There is no existing continuity in the heater relay coils.
CORRECTIVE ACTION
Check for continuity in the heater relay coils and replace the bad relay when
necessary.
The heater high-temperature cutout thermostatic switch is not operational.
CORRECTIVE ACTION
Check the operation of the heater high-temperature cutout thermostatic switch. It
should open when the temperature rises above setting. Replace bad thermostatic
switches when necessary.
MALFUNCTION 12
EXCESSIVE NOISE
SYMPTOM
The air conditioner is making excessive noise.
MALFUNCTION
The evaporator fan or the condenser fan is vibrating.
CORRECTIVE ACTION
If necessary, tighten fans on the shafts and tighten all mounting screws.
The evaporator fan and the condenser fan show signs of wear.
CORRECTIVE ACTION
Check the evaporator and condenser fan for wear, as indicated from noisy operation or
excessive side-to-side movement. If necessary, replace the worn or bad motor. (WP 0050
The compressor makes a consistent "knock" or "chatter" noise.
CORRECTIVE ACTION
If this condition occurs, stop the air conditioner and notify your supervisor.
END OF WORK PACKAGE
0010 00-8

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