82
Chapter 4
Step 1: Before Continuing with
Troubleshooting...
WARNING! All electric power should be disconnected and
you should have already made sure that the compressor does
not have a ground fault (see “Checking for a Ground Fault”
on pages 47-48). You should have also checked the windings
for continuity and proper resistance (see “Checking for Conti-
nuity and Proper Resistance” on pages 48-49), made sure the
system is getting proper voltage, and that the control, thermo-
stat, and contactor are working properly.
Step 2: Allow Thermal Protector to
Reset
When servicing 3-phase motors be sure to allow time for the
internal thermal protector to reset prior to starting these electri-
cal wiring checks. For some compressors, the internal thermal
protector may take as long as an hour to reset.
Step 3: Check External Components
Check the sensor terminals for continuity. If open, replace the
sensor terminals.
Step 4: Continue Troubleshooting
If all above tests prove satisfactory and unit still fails to operate
properly, check for adequate compressor pumping as outlined in
the procedure on page 83.
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