21
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 Sufcient
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 xtures, tools or asssembly techniques
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 1-800-848-7735.
ATTENTION: The automatic pressure switch prevents this
unit from running if the tank pressure exceeds 100PSI. If the
compressor will not start, drain the pressure from the tank.
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