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SYMPTOM
Ł
POSSIBLE CAUSE
Ń
COMPRESSOR
STARTS AND
RUNS BUT
CYCLES ON THE
OVERLOAD
COMPRESSOR
STARTS AFTER
CYCLING THE
OVERLOAD
SEVERAL TIMES
COMPRESSOR
WILL NOT
START. IT HUMS
AND CYCLES ON
THE OVERLOAD
COMPRESSOR
WILL NOT START
AND MAKES NO
NOISE
COMPRESSOR
CYCLES OFF
(NOT ON
OVERLOAD)
COILS/FILTERS DIRTY OR PLUGGED X
AIR OR NONCONDENSABLE GASES
IN SYSTEM
XX
SYSTEM REFRIGERANT OVERCHARGED X X
DISCHARGE LINE RESTRICTED XX
CAPILLARY TUBE OR STRAINER
RESTRICTED OR PLUGGED
XX X
FAN BLADE OR MOTOR DEFECTIVE X X
FAN BLADE OR BLOWER WHEEL STUCK X X
SYSTEM REFRIGERANT UNDERCHARGED X X
EVAPORATOR AIRFLOW RECIRCULATION X
UNIT OVERSIZED FOR APPLICATION X
COMPRESSOR REQUIRES START ASSIST XX
NO POWER TO UNIT X
LOW VOLTAGE TO UNIT XXX X
OVERLOAD PROTECTOR OPEN X
OVERLOAD PROTECTOR INCORRECT
OR DEFECTIVE
XXX
CAPACITOR INCORRECT OR DEFECTIVE XXX X
THERMOSTAT CONTACTS ARE OPEN X
THERMOSTAT IS SET TOO HIGH OR LOW X
SELECTOR SWITCH IS OPEN
OR DEFECTIVE
X
WIRING IS INCORRECT OR DEFECTIVE XXXX
SYSTEM PRESSURES NOT EQUALIZED XX X
COMPRESSOR MOTOR OR
MECHANISM DEFECTIVE
XXXXX
COMPRESSOR GROUNDED X
FIGURE 34 — BASIC COMPRESSOR TROUBLESHOOTING GUIDE
52S
SERIES
18