Carrier VECTOR 1800 MT - Page 299

9-6
62-11039
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
9.4 REFRIGERATION
9.4.1 Unit Will Not Cool
Compressor contactor defective check
Compressor malfunction
Compressor defective 8.14
A defrost cycle did not terminate 8.24
Refrigeration system
Abnormal pressure 9.4.7
R
e
f
r
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g
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r
a
t
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o
n
s
y
s
t
e
m
Liquid line solenoid valve (LSV2/3) malfunction 9.4.12
9.4.2 Unit Runs But Has Insufficient Cooling
C
o
m
p
r
e
s
s
o
r
Compressor valves defective 8.14
C
ompressor
Unloader malfunction 8.15
Abnormal pressure 9.4.7
Unloader malfunction 8.15
Refrigeration system
Expansion valve malfunction 9.4.11
R
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g
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r
a
t
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o
n
s
y
s
t
e
m
No or restricted evaporator airflow 9.4.10
Suction Modulation Valve malfunction 8.23
9.4.3 Unit Operates Long Or Continuously In Cooling
Trailer
Hot Load Allow time to
pull down
T
r
a
i
l
e
r
Defective box insulation or air leak Correct
R
e
f
r
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g
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r
a
t
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o
n
s
y
s
t
e
m
Abnormal pressure 9.4.7
R
e
f
r
i
gerat
i
on system
Temperature controller malfunction 9.4.9
Compressor Defective 8.14
9.4.4 Unit Will Not Heat Or Has Insufficient Heating
Evaporator fan internal motor protector open 8.7.3
Heat relay defective Check
Heater(s) defective 8.7
Heater contactor or coil defective Replace
Unit will not heat or has insuffi-
Evaporator fan motor(s) defective or rotating backwards 8.7.3
U
n
i
t
w
i
l
l
n
o
t
h
e
a
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h
a
s
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s
u
f
f
i
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cient heat
Evaporator fan motor contactor defective Replace
Controller malfunction 9.4.9
Defective wiring Replace
Loose terminal connections Tighten
Low voltage 9.3