13
PROBABLE CAUSE
Motor/Pressure switch does not shut off motor when
air compressor reaches “cut-out” pressure and safety
relief valve activates.
Air compressor is incorrectly sized.
PROBABLE CAUSE
Defective pilot valve, the check valve is stuck open.
PROBABLE CAUSE
Defective motor/pressure switch.
PROBABLE CAUSE
Possible defective safety relief valve.
Excessive air tank pressure.
PROBABLE CAUSE
Defective gaskets.
PROBABLE CAUSE
Fittings are not tight enough.
PROBABLE CAUSE
Defective or rusted air tank.
PROBABLE CAUSE
Damaged inlet (reed) valve.
TROUBLESHOOTING
REMEDY
Move the motor/pressure switch to the “Off” position. If
the motor doesn’t shut off, unplug the air compressor. If
the electrical contacts are welded together, replace the
pressure switch.
Limit the air pressure to the capacity of the air
compressor. Either use a smaller tool or a larger air
compressor.
REMEDY
Remove, clean or replace.
REMEDY
Replace.
REMEDY
Operate safety relief valve manually by pulling on ring.
If it still leaks, it should be replaced.
Defective motor/pressure switch. Replace.
REMEDY
Replace and torque head bolts to 20 ft./lbs.
REMEDY
Tighten fittings where air can be heard escaping. Check
fittings with soapy water solution. Do not overtighten.
REMEDY
Air tank must be replaced. Do not attempt to repair
air tank!
REMEDY
Contact SENCO Customer Service 888-222-8144.
Symptom 3. When in the Start/Stop option, motor runs continuously.
Symptom 4. Air continues to leak at motor/pressure switch release valve after motor stops.
Symptom 5. Air continues to leak at motor/pressure switch release valve while motor is running.
Symptom 6. Air leaks from safety relief valve.
Symptom 7. Air leaks at pump.
Symptom 8. Air leaks at fittings.
Symptom 9. Air leak in air tank.
Symptom 10. Air blowing from inlet filter.
