Air Solenoid (N/O).
Closed when the compressor is on.
Open when compressor is off.
With the solenoid open, the air
pressure will exhaust and allow the
compressor to start.
Exhaust Port
Air Hose
Connection
32psi. Pressure
Relief Valve.
The valve will open when the
compressor builds over 32psi.
This is a normal function.
NO
YES
NO
Replace the
compressor.
Is the compressor
trying to start?
(Humming)
NO
YES
Have the steps been
followed in the
(Air Compressor will
not start) section?
See (Air Compressor
will not start) section?
Disconnect the air hose
from the air solenoid.
Turn the compressor on.
Dose the compressor start.
Replace the
air solenoid.
YES
YES
The compressor is ok.
NO
Is there air coming
out of the air
Pressure
Relief Valve?
YES
Repair or replace
Pressure
Relief Valve?
YES
Is there air coming
out of the air
solenoid exhaust?
Repair or replace
the air compressor.
Repair or replace
the air solenoid.
NO
NO
390 Finish
Pro
Air Compressor runs but will not build pressure.
Connect a test air gauge
to the air hose connector.
Start the compressor.
Do you have 32psi?
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