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Trouble Probable Cause Remedy
TROUBLESHOOTING COOLING UNIT REFRIGERATION SYSTEM
COMPRESSOR DOES NOT
OPERATE.
A. Glycol (coolant) sufficiently
cooled.
A. Refrigeration not called for.
B. Cooling Unit POWER switch in
‘‘OFF’’ (down) position.
B. Place Cooling Unit POWER
switch in ‘‘ON’’ (up) position.
C. No power source (blown fuse
or tripped circuit breaker).
C. Replace blown fuse or reset
circuit breaker.
D. Low voltage. D. Voltage must be at least 103 VAC
at compressor terminals when
compressor is trying to start.
E. Loose, disconnected, or
broken wiring.
E. Tighten connections or replace
broken wiring.
F. Overload protector cut out;
overheated compressor.
Condenser fan motor not
operating as required.
F. Compressor will cool enough to
restart. Refer to ‘‘CONDENSER
FAN MOTOR NOT OPERATING’’
in this section;
G. Inoperative overload protector
or start relay.
G. Replace inoperative part.
H. Inoperative contactor. H. Replace contactor.
I. Inoperative control board. I. Replace control board.
J. Evaporator or condenser outlet
temperature sensor
inoperative (open).
J. Replace inoperative temperature
sensor.
K. No voltage to control board. K. Check for loose or broken wiring.
Check transformer for 24 ± VAC
output.
L. Inoperative compressor. L. Replace compressor.
COMPRESSOR WILL NOT
STOP AFTER GLYCOL
A. Glycol tank temperature
control inoperative.
A. Replace temperature control
sensor.
(COOLANT) HAS BEEN
SUFFICIENTLY COOLED.
B. Circuit board inoperative. B. Replace circuit board.
COMPRESSOR OPERATES
CONTINUOUSLY BUT DOES
NOT COOL GLYCOL
(COOLANT) SUFFICIENTLY.
A. Cooling Unit located in
excessively hot area.
A. Refer to IMPORTANT note at
start of SELECTING COOLING
UNIT LOCATION in
INSTALLATION SECTION.
B. Air circulation through Cooling
Unit restricted.
B. Clean air filter on back of Cooling
Unit as instructed.
CONDENSER FAN MOTOR
NOT OPERATING.
A. Jumper cord loose or
disconnected from condenser
fan motor or compressor
terminals. Broken wire in cord.
A. Tighten connections or replace
cord.
B. Fan blade obstructed. B. Remove obstruction.
C. Inoperative condenser fan
motor.
C. Replace condenser fan motor.
NOTE: If overload protector cuts out compressor,condenser fan motor will continue to operate;
otherwise, troubleshooting condenser fan motor problems are same as for ‘‘COMPRESSOR DOES NOT
OPERATE’’ paragraph plus the preceding: