Symptom
Possible Cause (s)
Corrective Action
Compressor will
not run
1.
No electrical power
2.
Blown fuse
3.
Breaker open
4.
Thermal overload open
5.
Pressure switch bad
1.
Plugged in? Check fuse/breaker or motor
overload
2.
Replace blown fuse
3.
Reset, determine cause of problem
4.
Motor will restart when cool
5.
Replace
Symptom
Possible Cause (s)
Corrective Action
Motor hums but cannot
run or runs slowly
1.
Defective check valve or
unloaded
2.
Poor contacts, line voltage
low
3.
Shorted or open motor
winding
1.
Replace or repair
2.
Check connections, eliminate extension cork if
used, check circuit with voltmeter
3.
Replace motor
DANGER!
Do not disassemble check valve with air
in tank; bleed tank
Fuses blow/circuit
breaker trips
repeatedly
CAUTION!
Never
use an extension cord
with this product
1.
Incorrect size fuse, circuit
overloaded
2.
Defective check valve or
unloaded
1.Check for proper fuse, use time-delay fuse.
Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit
2.Replace or repair
DANGER!
Do not disassemble check valve with air
in tank; bleed tank
Thermal overload
protector cuts out
repeatedly
1.
Low voltage
2.
Clogged air filter
3.
Lack of proper
ventilation/room temperature
too high
4.
Check valve malfunction
5.
Compressor valves failed
1.
Eliminate extension cord, check with voltmeter
2.
Clean filter (see Maintenance section)
3.
Move compressor to well ventilated area
4.
Replace
5.
Replace valve assembly
DANGER!
Do not disassemble check valve with air
in tank; bleed tank
Knocks, rattles,
excessive vibration
1.
Loose bolts, tank not level
2.
Defective bearing on
eccentric or motor shaft
3.
Cylinder or piston ring is
worn or scored
1.
Tighten bolts, shim tank to level position
2.
Replace
3.
Replace or repair as necessary
Tank pressure drops
when compressor shuts
off
1.
Loose drain cock
2.
Check valve leaking
3.
Loose connections at
pressure switch or regulator
1.
Tighten
2.
Disassemble check valve assembly, clean or
replace
3.
Check all connections with soap and water
solution and tighten
Compressor runs
continuously and air
output is lower than
normal/low discharge
pressure
1.
Excessive air usage,
compressor too small
2.
Clogged intake filter
3.
Air leaks in piping (on
machine or in outside
system)
4.
Broken inlet valves
5.
Piston ring worn
1.
Decrease usage or purchase unit with higher air
delivery (SCFM)
2.
Clean or replace
3.
Replace leaking components or tighten as
necessary
4.
Replace compressor valves
5.
Replace piston and cylinder
Excessive moisture in
discharge air
1.
Excessive water in tank
2.
High humidity
1.
Drain tank
2.
Move to area of less humidity; use air line filter
NOTE:
Water condensation is not caused by
compressor malfunction
Compressor runs
continuously and
safety valve opens as
pressure rises
1.
Defective pressure switch
2.
Defective safety valve
1.
Replace switch
2.
Replace safety valve with genuine replacement
part
Excessive starting and
stopping (auto start)
Excessive condensation in tank
Drain more often
Air leaking from
unloader on pressure
switch
Check valve stuck in an open
position
Remove and replace check valve
DANGER!
Do not disassemble check valve with air
in tank; bleed tank
8
TROUBLESHOOTING
