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Section Ill. TROUBLESHOOTING
3-4. General
2. Each malfunction stated is followed by a list of
This section provides information in diagnosing
probable causes
of the trouble. The corrective
and correcting unsatisfactory operation or failure of
action recommended is described opposite the
the air conditioner at the organizational level.
probable cause.
Malfunctions which may occur are listed in table 3-
Table 3-2. Troubleshooting
Malfunction
1. Air conditioner fails to operate.
2. Air conditioner noisy.
3. Evaporator fan fails to operate.
4.
5.
Fan rotation wrong.
Condenser fan fails to operate..
6. Insufficient cooling.
7. Air output volume insufficient.
Probable Cause
a. Main power cable disconnected.
b. Loose electrical connections.
a. Compressor oil level incorrect.
b. Compressor defective.
c. Condenser fan bent or broken.
d. Evaporator fan bent or broken.
a. Motors not receiving electrical
power.
b. Faulty Switch No. 2.
c. Loose connections between motor
and power supply.
d. Fan blade binding.
e. Fan motor too hot and overloads
open.
f. Burned out fan motor.
g. Power relay defective.
Wrong motor wiring.
a. Switch No. 3 not on COOL
b. Switch No. 4 not set at low enough
temperature
c. Loose connection in wiring.
d. Defective power relay.
e. Defective selector switch, switch
No. 3.
f. Fan blade binding.
g. Fan motor too hot and overloads
open.
h. Burned out fan motor.
a. Receiver valve closed.
b. Insufficient air output
c. Evaporator fan motor defective.
d. Condenser fan motor defective.
e. Compressor defective.
f. Thermostat defective.
g. Low on refrigerant.
h. Filter drier clogged.
a. Dirty filter.
b. Improper evaporator fan rotation.
Corrective Action
a.
b.
a.
b.
c.
d.
a.
b.
Connect power cable.
Tighten connections.
Report
to
direct
support
maintenance.
Report
to
direct
support
maintenance.
Replace bent or broken condenser
fan. (para 3-18).
Replace
bent
or
broken
evaporator fan. (para 3-17).
See Item 1 above.
Replace Switch No. 2. (para 3-
25).
c. Check for
and tighten
loose
connections.
d. Relieve binding.
c. Test fan motor. (para 3-17).
f. Replace fan motor (para 3-17).
g. Replace defective motor relay
(para 3-27).
Check wiring diagram (fig. FO-1).
a. Put switch No. 3 on COOL
b. Set switch No. 4 on COOLER.
c. Check for and tighten
loose
connections.
d. Replace power relay (para 3-27).
e.
f.
g.
h.
a.
b.
c.
d.
e.
f.
g.
h.
a.
b.
Replace switcb (para 3-25)
Relieve binding.
Test fan motor (para 3-18).
Replace fan motor (para 3-18).
Open receiver valve.
Correct condition see item 7.
Replace evaporator motor. (para
3-17).
Rep lace
condenser fan
motor
(para 3-18).
Report
t o d i r e c t
support
maintenance.
R e p o r t to
direct
support
maintenance.
R e p o r t to
direct
support
maintenance.
R e p o r t t o d i r e c t s u p p o r t
maintenance.
Clean filter (para 3-15).
Check and correct phasing (para
3-17).
3-3
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