66
Chapter 4
Step 4: Check Start Capacitor-
Continued
•
Excessive short cycling. Short cycling can be caused by
problems with the compressor’s thermal protector or sys-
tem components such as the thermostat, control, contac-
tor, or high or low pressure cut-out. For more information
on troubleshooting the thermal protector, see Step 3. For
troubleshooting the system components, refer to the OEM
service information.
Step 5: Check External Thermal
Protector
Check for continuity across the thermal protector. If there is no
continuity and Steps 1through 4 have been completed allowing
the thermal protector sufficient time to reset, replace the ther-
mal protector.
Step 6: Check Wiring
Confirm that there is continuity between 5 and C, 2 and S, and
6 and R. Reconnect wiring.
Step 7: Replace Potential Relay
If all above tests prove satisfactory, there is no capillary restric-
tion, and the unit still fails to operate properly, replace the relay.
The new relay will eliminate any electrical problems which can-
not be determined with above tests.
Step 8: Continue Troubleshooting
If the new relay does not correct the problem, check for ade-
quate compressor pumping as outlined in the procedure on
page 83.
