Troubleshooting
Problem
Compressor does not run.
Motor hums but does not run or
runs slowly.
Fuses blow or circuit breaker trips
repeatedly.
Possible Cause
□ Tank has insufficient pressure.
□ No electrical power.
□ Blown stop/house fuse.
□ Tripped shop/home breaker.
□ Thermal overload is open.
□ Loss of power or overheating.
□ Pressure switch is bad.
□ Low voltage.
□ Wrong gauge wire or length
of extension cord.
□ Shorted or open motor
winding.
□ Defective check valve or
unloader.
□ Incorrect fuse size, circuit
overload.
□ Wrong gauge wire or length
of extension cord.
□ Defective check valve or
unloader.
Solution
□ When the tank pressure drops, the
compressor will turn on to cut-in
pressure.
□ Ensure the compressor is plugged into a
good outlet.
□ Replace the shop/house fuse.
□ Reset the shop/home breaker and
determine the underlying cause.
□ Unplug the compressor and wait for it to
cool. Then try using again.
□ If using an extension cord, check for
proper use.
□ Replace the pressure switch.
□ Check voltage with a voltmeter.
□ Verify proper gauge wire and cord
length are used.
□ Bring the compressor to a service
center.
□ Bring the compressor to a service
center.
□ Verify proper fuse size is being used.
□ Use time-delay fuses.
□ Disconnect other electrical appliances
from the circuit or operate compressor
on its own branch circuit.
□ Verify proper gauge wire and cord
length are used.
□ Bring the compressor to a service
center.
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