Sub-Zero 700 Series - Compressor will Not Start

5-13
Compressor kicks out on
overload (continued).
Compressor will not start.
Compressor malfunction.
1. Relay and/or overload faulty.
2. Compressor rotor locked.
Sealed system overcharge.
Heat exchanger separated.
Compressor malfunction.
1. Relay and/or overload faulty.
2. Compressor rotor locked.
1.Use a starting cord to start compressor
direct. If compressor starts, replace
relay and overload.
2. Use a starting cord to start compressor
direct. If compressor does not start,
replace compressor.
NOTE: If compressor has just cycled off,
pressures will need to equalize before com-
pressor will start.
Check sealed system operating pres-
sures. If low side and high side pres-
sures are high, evacuate system and
recharge.
See OPERATING PRESSURES at front
of Sealed System Troubleshooting
Guide.
Check for 115V across P6 & P5 at con-
trol board. If voltage is outside of range
(105VAC to 125VAC), have line voltage
corrected.
1.Use a starting cord to start compressor
direct. If compressor starts, replace
relay and overload.
2. Use a starting cord to start compressor
direct. If compressor does not start,
replace compressor.
NOTE: If compressor has just cycled off,
pressures will need to equalize before com-
pressor will start.
Complaint Possible Cause Correction
SEALED SYSTEM TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
CAUTION! Line voltage
must be between 105VAC
to 125VAC. Improper line
voltage could cause com-
pressor to overheat.