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TROUBLESHOOTING CHART
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Symptom
Motor will not start.
Starter trips repeatedly.
Tank pressure builds up slowly.
Tank pressure builds up quickly.
Discharge pressure relief valve
pops off while compressor is
running.
Compressor will not unload
(Units with head unloaders)
Excessive belt wear.
Compressor runs hot.
Interstage pressure relief valve
pops off.
47794361 Rev.A
RELEASED 02/Nov/2023 21:18:09 GMT
Shut down compressor, relieve system of all pressure, disconnect, lockout and tagout power supply to the
starter before servicing the compressor unit.
Failure to do so may result in injury or equipment damage.
Never operate unit without door panels or guards in place.
Never use gasoline or flammable solvent on or around compressor unit. Explosion may result.
Possible Cause(s)
1.Main switch and fuses open.
2. Starter magnetic coils open.
3. Thermal overload tripped.
4. Defective pressure switch-contacts will
not close
5. Low voltage.
1. Improperly adjusted pressure switch.
2. Faulty check valve.
3. correct fuse size or magnetic starter coil.
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. Wrong pilot valve setting.
2. Defective pilot valve.
3. Lack of air to pilot valve
1. Pulley out of alignment.
2. Belts too tight or too loose.
1. Improper flywheel rotation.
2. Defective compressor valves.
3. Dirty air filter.
4. Dirty cylinder and/or intercooler.
1. Defective compressor valves.
2. Improper valve installation.
WARNING
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 coils are properly rated.
4. Check with voltmeter. Be sure voltage
corresponds to unit specifications.
5. Replace motor.
6. Tighten fittings.
7. Clean or replace.
8. Install new valves.
1.Drain tank.
1. Adjust to correct setting.
2. Replace valve.
Warning – Relieve tank pressure before
servicing.
1. Adjust to correct setting.
2. Replace pilot valve.
3. Open ball valve to pilot valve.
1. Realign motor pulley.
2. Adjust belt tension.
1. Check for correct rotation.
(Counter clockwise when viewed from drive side.)
2. Install new valve plate assembly.
3. Clean or replace.
4. Clean cylinder fins and/or intercooler.
1. Install new valves.
2. Verify proper valve placement.
Corrective Action
EN-13
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