Cornelius COR40RRTMD - Manual (Page 19)

Reach-In Refrigerator Service Manual
© 2004, IMI Cornelius Inc. - 15 - Publication Number: 630460272SER
T
ROUBLESHOOTING
Possible causes and solutions
PROBLEM POSSIBLE CAUSE SOLUTION
COMPRESSOR WILL NOT
START No voltage in the electrical
socket. Use a voltmeter to check the
voltage.
The electrical conductor or
wires may be cut. Use an ohmmeter to check for
continuity.
Defective electrical
components such as:
thermostat, relay, thermal
protector, etc. Replace defective components.
Thermostat in “off” position. Turn the thermostat’s knob to
its maximum position and wait
to see if the compressor starts.
Compressor motor has a
winding open or shorted. Measure the ohmic resistance
of the main and auxiliary
windings using an ohmmeter.
Compare them with the correct
values.
Dirty condenser; lack of air
flow. Clean condenser and allow for
air circulation.
Low voltage. Use a voltage regulator if the
voltage is lower than 103 volts.
Compressor is stuck. Change the compressor.
Temperature control contacts
are open. Repair or replace the contacts.
Time clock circuits are open. Determine the reason and
repair or replace.
Incorrect wiring. Check the wiring diagram and
correct.
THE TEMPERATURE IS TOO
COLD Thermostat knob is set at a
very cold position. Set the thermostat knob to a
warmer position and check if
the compressor stops
according to the thermostat’s
operating range.
Thermostat does not
disconnect the condensing unit. Check the insulation of the
thermostat. If the problem
persists, change the
thermostat.
Thermostat capillary bulb is
loose or installed improperly. Correctly fasten the thermostat
capillary bulb.
Control contacts are stuck
closed. File contacts. Change the
control. Check amperage load.
Defective or incorrect
temperature control. Determine correct control and
replace.