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XVII. TROUBLESHOOTING
XVII. TROUBLESHOOTING
FIGURE 59
FIGURE 62
WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
S
Y
M
P
T
O
M
Unit will not run
Condenser fan runs, compressor
doesn't
n I
s
f u
c i f
e i
t n
c
o
o
n i l
g
C
o
m
p
e r
s s
r o
s
h
o
t r
c
c y
e l
s
R
e
g
s i
e t
s r
s
w
e
t a
High head-low vapor pressures
H
g i
h
h
e
a
d
h -
g i
h
r o
n
r o
m
a
v l
a
p
r o
p
e r
s s
u
e r
-
C
o
o
n i l
g
m
o
d
e
L
o
w
h
e
a
d
h -
g i
h
v
a
p
r o
p
e r
s s
u
e r
L
o
w
v
a
p
o
- r
c
o
o
c l
o
m
p
e r
s s
o
- r
iced evaporator coil
H
g i
h
v
a
p
r o
p
e r
s s
u
e r
F
u l
c
u t
t a
n i
g
h
e
a
d
&
v
a
p
r o
pressures
G
u
g r
e l
r o
p
u
s l
n i
g
n
o
s i
e
t a
expansion device or liquid line
Circulating air blower & inducer
run continuously,
c
o
m
p
e r
s s
r o
w
l l i
n
t o
s
a t
t r
104
104
COOLING TROUBLE SHOOTING CHART
COOLING TROUBLE SHOOTING CHART
P
O
S
S
B I
L
E
• Power off or loose electrical connection
• Thermostat out of calibration-set too high
•
F
a
e l i
d
c
o
n
a t
t c
r o
•
B
o l
w
n
u f
s
e
s
•
T
a r
n
f s
r o
m
r e
d
e
e f
c
v i t
e
• High pressure control open (if provided)
• Interconnecting low voltage wiring damaged
• Run or start capacitor failed (single phase only)
• Start relay defective 9single phase only)
•
L
o
o
s
e
c
o
n
n
e
t c
o i
n
• Compressor stuck, grounded or open motor winding
o
p
e
n
n i
e t
n r
l a
o
v
r e
o l
a
. d
•
L
o
w
v
l o
a t
g
e
c
o
n
d
t i
o i
n
•
L
o
w
v
l o
a t
g
e
c
o
n
d
t i
o i
n
•
I
m
p
o r
p
r e
y l
s
z i
e
d
u
n
t i
•
I
m
p
o r
p
r e
a
f r i
o l
w
•
n I
c
r o
e r
t c
e r
r f
g i
e
a r
t n
c
h
a
g r
e
• Air, non-condensibles or moisture in system
•
n I
c
r o
e r
t c
v
l o
a t
g
e
•
n I
c
r o
e r
t c
v
l o
a t
g
e
•
D
e
e f
c
v i t
e
o
v
r e
o l
a
d
p
o r
e t
t c
r o
•
R
e
r f
g i
e
a r
t n
u
n
d
e
c r
h
a
g r
e
•
L
o
w
e
v
a
p
r o
t a
r o
a
f r i
o l
w
• Restriction in liquid line, expansion device or filter drier
•
F
o l
w
c
h
e
k c
p
s i
o t
n
s
z i
e
o t
o
•
n I
c
r o
e r
t c
c
a
i p
a l l
y r
u t
b
e
s
•
T
X
V
d
o
e
s
n
t o
o
p
e
n
•
D
r i
y t
c
o
n
d
e
n
s
r e
c
l i o
•
R
e
r f
g i
e
a r
t n
o
v
e
c r
h
a
g r
e
•
C
o
n
d
e
n
s
r e
a f
n
n
t o
u r
n
n
n i
g
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
s
•
D
e
e f
c
v i t
e
C
o
m
p
e r
s s
r o
v
a
v l
•
n I
c
r o
e r
t c
c
a
i p
a l l
y r
u t
b
e
s
•
L
o
w
e
v
a
p
r o
t a
r o
a
f r i
o l
w
•
O
p
r e
t a
n i
g
b
e
o l
w
6
5
F °
o
u
d t
•
M
o
s i
u t
e r
n i
s
s y
e t
m
•
E
c x
e
s s
v i
e
o l
a
d
•
D
e
e f
c
v i t
e
c
o
m
p
e r
s s
r o
•
T
X
V
h
u
t n
n i
g
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
• Manual reset overtemperature control
• tripped
•
W
i
e r
o l
o
s
e
n i
i l
m
t i
i c
c r
u
t i
C
A
U
S
E
•
Check for correct voltage at compressor contactor in control
box
•
Reset
•
C
open
•
R
•
C
•
Reset-also see high head pressure remedy-The high pressure
control opens at 610 PSIG
•
Replace thermostat wiring
•
Replace
•
Replace
•
C
check & tighten all connections
•
Wait at least 2 hours for overload to reset.
f I
t A
plate volts when unit is operating.
•
A
d
•
R
•
C
•
C
•
Recover refrigerant, evacuate & recharge, add filter drier
•
t A
plate volts when unit is operating.
•
t A
nameplate marking when unit is operating.
•
R
•
A
d
•
n I
filter
•
Remove or replace defective component
s
m
l l a
•
C
•
C
•
R
•
C
•
C
•
R
s y
e t
m
•
R
e
s
•
R
•
R
•
n I
filter
o
o
s r
•
A
d
•
R
•
R
•
R
•
C
TXV
s y
e t
m
•
R
s y
e t
m
•
R
•
Reset or replace
•
C
R
E
M
E
D
Y
h
e
k c
f
r o
2
4
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s t l
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