(Section 7.26 continued from previous page)
B. Defective ice bank control.
B. Replace ice bank control.
C. Improper or loose wiring.
C. Correct wiring. Refer to wiring
diagram.
D. Low voltage.
D. Measure voltage across common
and run terminal on compressor.
Voltage must not drop below 90%
of rated voltage.
7.27
Compressor does NOT
A. Defective compressor relay
A. Replace compressor relay or
start (no hum), no ice
or overload.
overload.
bank, but condenser
B. Defective compressor.
B. Replace compressor.
fan motor runs.
C. Improper or loose wiring.
C. Correct wiring. Refer to wiring
diagram.
D. Low voltage.
D. Measure voltage across common
and run terminal on compressor.
Voltage must not drop below 90%
of rated voltage.
7.28
Compressor does NOT
A. Improper or loose wiring.
A. Correct wiring. Refer to wiring
start, but hums.
diagram.
B. Low voltage.
B. Measure voltage across common
and run terminal on compressor.
Voltage must not drop below 90%
of rated voltage.
C. Starting relay defective.
C. Replace starting relay. Be sure
to use correct relay. Failure to use
correct relay will cause compressor
failure.
D. Defective compressor.
D. Replace compressor.
7.29
Compressor starts and
A. Improper or loose wiring.
A. Correct wiring. Refer to wiring
switches off of start
diagram.
winding (will only run for B. Low voltage.
B. Measure voltage across common
a few seconds before
and run terminal on compressor.
internal overload
Voltage must not drop below 90%
switches Compressor
of rated voltage.
OFF).
C. Starting relay defective.
C. Replace starting relay. Be sure to
use correct relay. Failure to use
correct relay will cause compressor
failure.
D. Excessively high refrigerant
D. This is normal if unit is unplugged
high side pressure.
from electrical outlet then
immediately plugged back into
electrical outlet before refrigerant
pressure has time to equalize.
After about 5 minutes, compressor
will start automatically and run.
E. Defective compressor.
E. Replace compressor.
7.30
Compressor starts and
A. Improper or loose wiring.
A. Correct wiring. Refer to wiring
runs a short time, but
diagram.
shuts off on overload.
B. Low voltage.
B. Measure voltage across common
and run terminal on compressor.
Voltage must not drop below 90%
of rated voltage.
C. Excessively high refrigerant
C. 1.
Defective condenser fan
high side pressure.
motor. Replace.
2.
Dirty condenser. Clean.
3.
Dirty intake air filter. Clean.
4.
Back of unit too close to wall.
Move unit away from wall at
least two (2) inches (5.1 cm).
(Section 7.30 continued on next page)
20
TROUBLE
CAUSE
REMEDY
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