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12 Senco
®
Electric Air Compressor Manual 2004
TROUBLESHOOTING
1. Motor will not run or restart.
REMEDY
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; only "Fusetron" type T fuses
are acceptable.
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 #10 for proper gauge wire and
cord length.
When pilot valve is set in the Start/Stop position,
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" posi
-
tion.
Remove and clean or replace.
Contact Senco Customer Service @ 800-543-4596
PROBABLE CAUSE
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.
Pilot valve's check valve stuck open.
Defective motor, motor capacitor or motor/pressure
switch.
SYMPTOM
2. Noisy operation.
REMEDY
Tighten pulley and or flywheel.
Add correct amount of oil. Check for bearing dam-
age.
Remove cylinder head and inspect. Clean or re-
place.
STOP THE COMPRESSOR! Contact Senco
Customer Service @ 800-543-4596.
PROBABLE CAUSE
Loose motor pulley or pump flywheel.
Lack of oil in the pump.
Carbon deposits on pistons or valves.
Bearing, piston or connecting rod failure.
SYMPTOM