APPENDIX
SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE/
CORRECTIVE ACTION
No power at motor
Check for voltage at power
not start or attempt to start.
terminals.
outlet.
If there is no power (should
be 115 vac at the wall), turn
on main circuit breaker.
If there is voltage at power
outlet but not at motor
terminals, check for broken
or loose wire, defective
circuit breaker, or defective
pressure switch. Refer to
wiring diagram, Figure 4-3,
as a guide.
Replace/repair appropriate
component.
2. Compressor motor
Defective unloader valve.
Depress red manual
attempts to start, but will
unloader valve tab on
not run.
pressure switch.
If compressor will not
unload, repair or replace
unloader valve.
Defective capacitor.
+terminal) to measure
across the capacitor
terminals. Voltage should
rise.
Reverse position of leads
and the voltage should
decrease.
MD0366
A-1