ELECTRIC COMPRESSOR TROUBLESHOOTING
The following guide has been compiled to assist the consumer in identifying problems
that may be encountered with electric compressors. Please inspect for possible
causes and contact an authorized service center when necessary.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Motor Won’t Start
No Power to Compressor
Switch Lever in “Off” Position
Faulty Start Relay
Faulty Start Capacitor
Check Circuit Breaker or Fuse.
Move Switch Lever to On
Position.
Compressor Won’t
Restart
Check Valve Leaks
Low Voltage to compressor
Pressure Switch Hanging Up
Inspect Check Valve-Contact
Service Center.
Connect Unit to Sufficient
Voltage Source.
Inspect Pressure Switch-
Contact Service Center.
Low Air Output
Leak At Fitting(s)
Broken Valve Flapper
Debris in Valves
Faulty Head Gasket
Faulty Valve Plate Gasket
Worn Piston Cup
Inspect Fittings-If Loose or
Damaged Contact Service
Center.
Compressor Won’t
Shut Off
Leak At Fitting(s)
Broken Valve Flapper
Debris in Valves
Faulty Head Gasket
Faulty Valve Plate Gasket
Worn Piston Cup
Relief Valve Leaking
Inspect Fittings-If Loose or
Damaged Contact Service
Center.
Water in Air Lines
or Tools
Tank Not Drained Regularly
Drain Air from Tank(s) through
Drain Valves.
Ensure Air Lines are Free of
Moisture.
Low Pressure to
Tools
Damaged Gauge on Regulator
Regulator Not Adjusted Properly
Faulty Regulator
Inspect Gauge-Contact Service
Center.
Adjust Regulator to Required
Pressure.
Inspect Regulator-Contact
Service Center.
These procedures require special fixtures, tools or asssembly tech-
niques available only through a Service Center. For service, contact the
dealer from whom you purchased the compressor. To order parts, visit our
website, www.thomasairpac.com, or call our Customer Service Center at
1-800-558-7721.
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