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TROUBLESHOOTING
Symptom 1. Motor will not run or restart.
Symptom 2. Noisy operation.
Power cord not plugged in.
Motor/Pressure switch in “OFF” position.
Motor thermal overload switch has
tripped.
Fuse blown or circuit breaker has tripped.
Wrong gauge wire or length of extension
cord.
Air tank pressure exceeds motor/
pressure switch “cut-in” pressure.
Pressure release valve on motor/
pressure switch has not unloaded pump
head pressure.
Defective motor, motor capacitor, motor/
pressure switch, or check valve.
Loose motor pulley or pump flywheel.
Lack of oil in the pump.
Carbon deposits on pistons or valves.
Bearing, piston or connecting rod failure.
Plug cord into grounded outlet.
Move switch to “AUTO” position.
Turn air compressor off, wait until motor is cool, then press
motor thermal overload (red) button firmly until click is heard.
Replace fuse or reset circuit breaker.
Check for proper fuse amperage.
Check for low voltage conditions.
Disconnect any other electrical appliances from circuit or
operate air compressor on its own branch circuit.
Check chart on page #9 for proper gauge wire and cord length.
Motor will start automatically when air tank pressure drops
below “cut-in” pressure of motor/pressure switch.
Bleed the line by moving the switch to the “Off” position.
Contact Senco Customer Service.
Tighten pulley and or flywheel.
Add correct amount of oil. Check for bearing damage.
Remove cylinder head and inspect. Clean or replace.
STOP THE COMPRESSOR! Contact Senco Customer
Service.