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Page Title:
Table 1. Unit Troubleshooting Procedures - Continued |
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 TM 9-4120-425-14&P
UNIT TROUBLESHOOTING - Continued
0014-00
Table 1. Unit Troubleshooting Procedures - Continued
MALFUNCTION
TEST OR INSPECT
CORRECTIVE ACTION
5.
See whether Temperature
Adjust setting or replace switch or
2.
INSUFFICIENT COOLING -
Selector switch is set incorrectly
other corrective action. (Refer to WP
Continued
or is defective.
6.
Test evaporator air discharge
Repair or replace louver. (Refer to
louver to see whether it is bent, or
stuck in the CLOSED position.
7.
Observe evaporator fan motor or
Report fault to Direct Support
condenser fan motors to see
Maintenance personnel or replace
whether they are defective.
motor. (Refer to WP 0030-00 and
Tighten setscrew or replace fan.
8.
Check to see whether evaporator
(Refer to WP 0030-00 and WP 0031-
impeller fan or condenser fans are
loose or defective.
9.
Check high pressure cutout
Reset.
switch.
1.
Make sure that power cable is
Connect cable.
3.
EVAPORATOR OR
properly connected.
CONDENSER FAN MOTOR
FAILS TO OPERATE
2.
Test for bad fan motor. (Refer to
Report fault to Direct Support
Personnel. (Refer to WP 0030-00 and
Check for bad capacitor by using
a multimeter.
3.
Check evaporator or condenser
Report fault to Direct Support
fan motor for binding.
Personnel. (Refer to WP 0030-00 and
4.
Check continuity of wiring
Replace or repair wiring connections.
connections. (Refer to WP 0030-
(Refer to WP 0122-00.)
Replace bad relay. (Refer to WP
5.
Disconnect fan motor relay.
Actuate primary contacts with 24
volt AC source, then check
continuity of contacts that should
be closed. (Refer to WP 0036-
6.
Inspect Mode Selector rotary
Replace bad switch. (Refer to WP
switch for failure or damage.
(Refer to WP 0034-00.)
0014-00-4
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