18
REFRIGERATION & ELECTRICAL
DIAGNOSTIC GUIDE
PROBLEM
POSSIBLE CAUSE
SOLUTION
Compressor
will not start
(no hum)
Be sure power is being
supplied to the merchandiser
Ambient colder than thermostat
setting
Thermostat stuck in open position
Wiring improper or loose
Compressor motor has a winding
open or shorted
Internal mechanical trouble in
compressor
Unit is in defrost open position
Overload protector stuck in
Check power cord
Check plug in
Check breaker switch
Adjust thermostat if necessary
Replace thermostat
Check actual wiring against diagram
Replace compressor
Replace compressor
Allow defrost cycle to complete, usually 15-20
minutes, or turn manual control on defrost
Replace overload protector
Summary of Contents for POLAR TEMP 1000AD
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