Troubleshooting - Craftsman CMXECXM301 Instruction Manual

TROUBLESHOOTING

WARNING: Risk of Unsafe Operation. Unit cycles automatically when power is on. When servicing, you
may be exposed to voltage sources, compressed air, or moving parts. Before servicing unit, unplug or
disconnect electrical supply to the air compressor, bleed tank of pressure, and allow the air compressor
to cool.
PROBLEM
The compressor does not run.
The motor hums while running slowly,
or it does not run at all.
The compressor is making squealing
sounds.
The compressor is experiencing
restricted air intake
CAUSE
The tank has insufficient pressure.
There is no electrical power to the unit.
The circuit breaker has tripped or a fuse
has blown at the main power source.
The thermal overload protector is
actuated.
There is loss of power or overheating.
The pressure switch is bad.
There is low voltage from the power
source.
There are loose electrical connections.
There is a shorted or open motor wiring.
There is a defective check valve or
unloader.
Fuse blown, circuit breaker tripped.
Extension cord is wrong length or gauge.
Loose electrical connections.
Faulty motor.
Motor overload protection switch
has tripped.
The compressor pump has no oil.
The belt is too loose.
The air filter is dirty.
15
CORRECTION
When the tank pressure drops, the compressor will turn on to
cut-in pressure.
Verify the wiring connection inside the pressure switch and the
terminal box area.
Check the fuse/breaker to determine the underlying cause.
Turn the air compressor OFF.
Wait until the compressor cools down.
Depress the red reset button on the motor.
Turn the air compressor to AUTO.
Verify the wiring.
NOTE: Long lengths of electrical wiring could cause power loss
to the motor.
Replace the pressure switch.
Check the voltage with a voltmeter.
Verify the wiring connections inside the pressure switch and
the terminal box area is secure.
Bring the compressor to a service center.
Bring the compressor to a service center.
Check fuse box for blown fuse and replace as necessary. Reset circuit
breaker. Do not use a fuse or circuit breaker with higher rating than that
specified for your particular branch circuit.
Check for proper fuse. You should use a time delay fuse.
Check for low voltage problem.
Check the extension cord.
Disconnect the other electrical appliances from circuit or operate the
compressor on its own branch circuit.
Check the extension cord.
Check wiring connection inside terminal box.
Have checked by a Trained Service Technician.
Refer to Motor Overload Protector under Description of Operation .
If motor overload protection trips frequently, contact a Trained
Service Technician.
Check the pump oil.
Check the belt tension.
Clean or replace the air filter.
ENGLISH