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 3-8. Fuse Service
(2)
Remove the control box cover (para
a.
General. The unit is equipped with two 6 am-
3-24).
pere
cartridge fueses mounted in the upper right
(3)
The fuses are mounted in spring clamps,
side
of the control box.
pry fuse
out and replace.
(4)
Install cover and panel.
b.
Removal and Installation.
(1) Remove the f rent access panel (para
3-15).
Section IV. TROUBLESHOOTING
tive action recommended is described opposite the
3-9. General
probable cause.
This section provides information useful in
diagnosing and correcting unsatisfactory opera-
tion or failure of the air conditioner or its compo-
Refer to table 3-2 for the list of trouble symp-
nents. Malfunctions which may occur are listed
toms and the corrective action procedures.
in. table 32. Each malfunction is followed by a
list of probable causes of the trouble. The correc-
Table 3-2. Troubleshooting
Malfunction
Corrective action
Probable cause
1. Compressor fails to start.
a. Control circuit open and/or fuse
a. Repair control circuit and replace
blown.
fuse.
b. Circuit breaker contacts open.
b. Reset circuit breaker (para
c. Contacts of high pressure cutout
c. Press reset button.
switch open.
d. Outdoor thermostat defective or
d. Wait until the ambient tempera-
open.
ture exceeds 50 F. If switch is ino-
perative, replace switch (para 3-24).
e. Circuit breaker defective.
e. Replace circuit breaker (para
f. Wiring defective.
f. Replace defective wiring (para
g. Replace contactor (para 3-30).
g. Compressor motor contactor de-
fective.
h. Replace evaporator heater con-
h. Evaporator heater contactor de-
fective.
tactor (para 3-30).
i. Interchange two wires to reverse
i. Phase sequence relay contacts
phase sequence (para 3-26). Replace
open.
relay if defective (para 3-26).
Clean filter and coil (para 3-7).
Filter or evaporator coil air restric-
2. Suction pressure inadequate.
tion.
Service condenser and evaporator
Insufficient volumn of air passing
3. High discharge pressure.
coil (para 3-7).
through condenser coil.
4. Suction and discharge pressure low.
Check sight glass for appearance of
Lack of refrigerant.
bubbles. Report low refrigerant to di-
rect support maintenance.
a. Clean condenser coil (para 3-7).
5. Compressor starts but fails on over
a. High discharge pressure.
Remove obstruction from grilles.
load.
b. Service air conditioning filter
b. Suction pressure low.
c. Replace blower motor (para
c. Blower motor defective.
a. Test and replace defective heater
a. Defective heater, contactor, or
6. Little or no heating capacity.
and contractors. Check the wiring cir-
circuits.
cuits, repair or replace as necessary.
b. Service the air conditioning filter
b. Air movement over the evapora-
tor insufficient.
mum airflow.
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