17
English
Problem
Possible Cause
Solution
The motor hums, but
does not run or runs
slowly.
The voltage from the power supply is low.
The gauge wire or the length of extension
cord is wrong.
The motor winding is shorted or broken.
The unloader or check valve is defective.
Check the voltage with a voltmeter.
Use the correct wire gauge and length
extension cord.
Take the compressor to a service center.
Take the compressor to a service center.
The fuses blow or the
circuit breaker trips
repeatedly.
The fuse size is incorrect or the circuit is
overloaded.
The gauge wire or the length of extension
cord is wrong.
The unloader or check valve is defective.
Check the fuse or breaker at the power supply
is the correct size and type. Be sure to use
only time-delay fuses to avoid overloading a
curcuit, disconnect other electrical appliances
from circuit or operate compressor on its own
branch circuit.
Use the correct wire gauge and length
extension cord.
Take the compressor to a service center.
The thermal overload
protector cuts out
repeatedly.
The voltage from the power supply is low.
A poorly ventilated room is causing the
motor to overheat.
The gauge wire or the length of extension
cord is wrong.
Check the voltage with a voltmeter.
Move the compressor to well-ventilated area.
Check for proper gauge wire and cord length.
The air receiver
pressure drops when the
compressor shuts o
ff
.
The connections are loose or leaking
(
fi
ttings, tubing, etc.).
The drain valve is loose.
The check valve is leaking.
Check all the connections with soapy water
and look for bubbles. Tighten any loose
conections until the leak stops.
Tighten the drain valve.
Take the compressor to a service center.
WARNING:
Do not disassemble
check valve while
air is in tank - empty
the all the air out
of the tank before
dissasembly.
There is excessive
moisture in the air
discharge.
There is excessive water in the air tank.
The humidity is high.
Drain the tank to remove water.
Move the compressor to an area of less
humidity or use an air line
fi
lter to reduce
moisture discharge in the tank.
Air is leaking from the
compressor.
The hose connection is loose or
improperly sealed.
The air hose is broken or damaged.
Ensure connections are sealed with thread
sealing tape and tightened.
Replace the air hose.
The compressor runs
continuously
The tank drain valve is open.
The pressure switch is defective.
The usage is excessive.
Ensure the tank drain valve is closed.
Take the compressor to a service center.
Decrease the amount of tool run-time; the
compressor is not large enough to supply the
air requirement of the tool.
The compressor
vibrates.
The compressor mounting bolts are loose. Tighten mounting bolts.
The air output is lower
than normal.
The inlet valves are broken.
The connections are leaking.
Take the compressor to a service center.
Apply thread sealing tape to
fi
tting and
tighten.
00Book̲EC914S̲NA.indb 17
00Book̲EC914S̲NA.indb 17
2020/06/08 13:46:34
2020/06/08 13:46:34
