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TROUBLE SHOOTING GUIDE FOR COMPRESSOR
Always disconnect unit from power supply and relieve all pressure from air tank before performing
any maintenance. "Tag Out" or "Lock Out" disconnect switch. Failure to do so may result in
equipment damage or injury.
Never use gasoline or flammable solvent on or around compressor unit. Explosion may result.
Troubleshooting Chart
Symptom
Motor will not start
Starter trips repeatedly
Tank pressure builds up slowly
Tank pressure builds up quickly
Discharge pressure relief valve pops
while compressor is running
Excessive belt wear
Possible Cause(s)
1.
Main switch and fuses open
2.
Starter heater coils open
3.
Starter tripped
4.
Defective pressure switch-
contacts will not close
5.
Low voltage
1.
Improperly adjusted pressure
switch
2.
Faulty check valve
3.
Incorrect fuse size or magnetic
starter heaters
4.
Low voltage
5.
Defective motor
1.
Air leaks
2.
Dirty air filter
3.
Defective compressor valves
1.
Excessive water in tank
1.
Wrong pressure switch setting
2.
Defective ASME relief valve
1.
Pulley out of alignment
2.
Belts too tight or too loose
IF3163 Rev A Page 19
Corrective Action
1.
Check all fuses and switches
Check for loose or faulty wires
2.
Check overload relay in starter.
Reset starter
3.
Reset starter. If starter trips
repeatedly, have electrical
system inspected by an
electrician
4.
Repair or replace pressure switch
Warning – Relieve tank
pressure before servicing
5.
Check with voltmeter. Be sure
voltage corresponds to unit
specifications
1.
Adjust or replace
Warning – Relieve tank
pressure before servicing
2.
Clean or replace
Warning – Relieve tank
pressure before servicing
3.
Be sure that fuses and heaters
are properly sized
4.
Check with voltmeter. Be sure
voltage corresponds to unit
specifications
5.
Replace motor
1.
Tighten fittings.
2.
Clean or replace filter element
3.
Install new valves
1.
Drain tank
1.
Adjust to correct setting
2.
Replace valve
Warning – Relieve tank
pressure before servicing
1.
Realign motor pulley
2.
Adjust belt tension
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