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Section V. TROUBLESHOOTING - TM-5-4120-337-140035
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TM-5-4120-337-14 Air Conditioner Vertical: Compact Self-Contained Air Cooled Electrical Motor Driven Manual
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Table 4-2. Troubleshooting (Cont)
Corrective Action
Probable Cause
Malfunction
e. R e p l a c e d a m a g e d f a n i n l e t r i n g
e. D a m a g e d e v a p o r a t o r f a n i n l e t r i n g .
a. C l e a n  d i r t y  c o m p o n e n t s  a n d
a. D i r t y c o n d e n s e r c o i l . c o n d e n s e r
4. I n s u f f i c i e n t c o n d e n s e r a i r f l o w .
remove obstructions (para 4-67, 4-
coil guard. condenser fan guard.
Fan motor runs correctly.
14 or 4-31).
condenser fan or other obstructions
to air movement.
b. R e p l a c e  d a m a g e d
component
b. D a m a g e d c o n d e n s e r c o i l g u a r d o r
condenser  fan  gnard.
C.
Replace condenser fan (para 4-31).
c. D a m a g e d  c o n d e n s e r  f a n .
a. R e p l a c e  b l o w n  f u s e  ( p a r a  4 - 4 2 ) .
a. B l o w n f u s e F 1 o r F 2 .
5. N o p o w e r t o l o w v o l t a g e c o n t r o l
after inspecting for cause of fuse
circuit.
failure. Refer to figure 1-5 and 1-7
for electrical check points and
schematic electrical diagram.
b. R e f e r t o f i g u r e 1 - 5 f o r e l e c t r i c a l
b. D e f e c t i v e w i r i n g .
check points. Check connectors for
tightness and wiring for continuity
and  shorted  conditions.  Repair
defective wiring (para 4-49 and 4-
53).
c. R e p l a c e  d e f e c t i v e  c o m p o n e n t s
c. D e f e c t i v e  m o d e  s e l e c t o r  s w i t c h .
(para  4-44,  4-37,  4-38  or  4-39)
circuit  breaker,  transformer  or
rectifier.
a. S e e m a l f u n c t i o n N o . 5 .
a. N o p o w e r t o l o w v o l t a g e c o n t r o l
6. Compressor  will  not
start.
Fan
circuit.
motor runs correctly.
b. R e p l a c e
defective
components
b. D e f e c t i v e m o d e s e l e c t o r s w i t c h .
(para 4-44, 4-47, 4-37, 4-40, 4-48
compressor
run
capacitor,
circuit
or 4-41).
breaker, time delay relay, outside
air thermostat or compressor relay.
c. Refer to fig. 1-5 for electrical check
c. D e f e c t i v e w i r i n g .
points.  Check  connectors  for
tightness and wiring for continuity
and  shorted  conditions.  Repair
defective
wiring
and
4-
53)
d. W a i t f o r t h e c o m p r e s s o r t o c o o l
d. Open
compressor
thermal
over
and check for continuity. If still
load  protector.
open refer to G S maintenance (para
a. Refer to fig. 1-5 for electrical check
a. D e f e c t i v e w i r i n g .
7. C o m p r e s s o r s t a r t s b u t c y c l e s o n
points.  Check  connectors  for
thermal  overload  protector.
Fan
tightness and wiring for continuity
motor runs correctly.
and  shorted  conditions,  Repair
defective wiring (para 4-49 and 4-
53).
b. R e p l a c e c a p a c i t o r ( p a r a 4 - 4 7 ) .
run
compressor
b. D e f e c t i v e
capacitor.
c. R e f e r t o m a l f u n c t i o n N o s . 3 a n d 4 .
c. Restricted  or
insufficient
evaporator or condenser air flow.
a. C h e c k w i r i n g t o s o l e n o i d v a l v e a n d
8. L i t t l e o r n o t c o o l i n g . C o m p r e s s o r
a. Compressor bypass solenoid valve
repair as required (para 4-49 and 4-
and fan motor run.
does not close when the air con-
53). Check solenoid valve electrical
ditioner is on the cooling mode.
coil to insure that when energized,
Liquid line solenoid remains closed
it closes.
when  temperature  control  ther-
mostat is calling for cooling.
b. R e p l a c e
b. D e f e c t i v e  t e m p e r a t u r e  c o n t r o l
defective
thermostat
thermostat.
c. R e f e r t o f i g u r e 1 - 5 f o r e l e c t r i c a l
c. Defective wiring.
check points.  Check  connections
for tightness and wiring for shorted
conditions. Repair defective wiring
(para 4-49 and 4-53).
d. R e f e r t o m a l f u n c t i o n N o s . 3 a n d 4 .
d. Restricted  or
insufficient
evaporator or condenser air flow.
4-4

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