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TROUBLESHOOTING GUIDE
SYMPTOM
Compressor will not run
Motor hums but cannot run
or runs slowly
Fuses blow/circuit breaker
trips repeatedly
Thermal overload protector
cuts out repeatedly
Air tank pressure drops when
compressor shuts off
Excessive moisture in
discharge air
Compressor runs continuously
Compressor vibrates
Air output lower than normal
POSSIBLE CAUSE(S)
1.
Unit is plugged into extension cord
2.
No electrical power
3.
Blown fuse
4.
Breaker open
5.
Thermal overload open
6.
Shorted or open motor winding
1.
Low voltage
2.
Unit is plugged into extension cord
3.
Shorted or open motor winding
4.
Defective check valve or unloader
1.
Incorrect size fuse, circuit overloaded
2.
Unit is plugged into extension cord
3.
Defective check valve or unloader
1.
Low voltage
2.
Clogged air filter
3.
Lack of proper ventilation / room
temperature too high
4.
Unit is plugged into extension cord
1.
Loose connections (fittings, tubing,
etc.)
2.
Loose drain valve
3.
Check valve leaking
4.
Check tank for cracks or pin holes
1.
Excessive water in air tank
2.
High humidity
1.
Defective pressure switch
2.
Excessive air usage
3.
Air leaks
Loose mounting bolts
1.
Broken inlet valves
2.
Intake filter dirty
3.
Connections leaking
CORRECTIVE ACTION
1.
Remove extension cord or use larger gauge
extension cord.
2.
Turn on pressure switch? Plugged in? Check fuse/
breaker or motor overload.
3.
Replace blown fuse.
4.
Reset, determining why problem happened.
5.
Unplug and allow motor to cool before trying to
restart.
6.
Replace motor.
1.
Check with voltmeter.
2.
Remove extension cord or use larger gauge
extension cord.
3.
Replace motor.
4.
Replace or repair.
1.
Check for proper fuse, use time-delay fuse.
Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit.
2.
Remove extension cord or use larger gauge
extension cord.
3.
Replace.
1.
Check with voltmeter.
2.
Clean filter (see Maintenance section).
3.
Move compressor to well ventilated area.
4.
Remove extension cord or use larger gauge
extension cord.
1.
Check all connections with soap and water solution
and tighten.
2.
Tighten.
3.
Disassemble check valve assembly, clean or replace.
4.
Replace tank. Never repair a damaged tank.
1.
Drain tank.
2.
Move to area of less humidity; use air line filter.
1.
Replace switch.
2.
Decrease air usage; compressor not large enough for
a requirement.
3.
Check all connections with soap and water.
Tighten.
1.
Replace valve plate assembly.
2.
Clean or replace intake filter.
3.
Tighten connections.
12
Do not disassemble check valve
with air in tank; bleed tank first.
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