PROBABLE CAUSE
Defective pilot valve, the check valve is stuck open.

TROUBLESHOOTING

Symptom 3. When in the Start/Stop option, motor runs continuously.

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.

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.

Symptom 4. Air continues to leak at motor/pressure switch release valve after motor stops.

REMEDY

Remove, clean or replace.

Symptom 5. Air continues to leak at motor/pressure switch release valve while motor is running.

PROBABLE CAUSE

REMEDY

Defective motor/pressure switch.

Replace.

 

 

 

 

Symptom 6. Air leaks from safety relief valve.

 

 

 

PROBABLE CAUSE

REMEDY

Possible defective safety relief valve.

Operate safety relief valve manually by pulling on ring.

 

If it still leaks, it should be replaced.

Excessive air tank pressure.

Defective motor/pressure switch. Replace.

 

 

 

 

Symptom 7. Air leaks at pump.

 

 

 

PROBABLE CAUSE

REMEDY

Defective gaskets.

Replace and torque head bolts to 20 ft./lbs.

 

 

 

 

Symptom 8. Air leaks at fittings.

 

 

 

PROBABLE CAUSE

REMEDY

Fittings are not tight enough.

Tighten fittings where air can be heard escaping. Check

 

fittings with soapy water solution. Do not overtighten.

 

 

 

 

Symptom 9. Air leak in air tank.

 

 

 

PROBABLE CAUSE

REMEDY

Defective or rusted air tank.

Air tank must be replaced. Do not attempt to repair

 

air tank!

 

 

Symptom 10. Air blowing from inlet filter.

 

 

 

PROBABLE CAUSE

REMEDY

Damaged inlet (reed) valve.

Contact SENCO Customer Service 888-222-8144.

 

 

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Senco PC1001 operating instructions Probable Cause Remedy