Error Code Chart; Air Compressor Runs But Will Not Build Pressure - Graco FinishPro 390 Repair Electrical Manual

Air Compressor runs but will not build pressure.

Is the compressor
trying to start?
NO
(Humming)
YES
Have the steps been
followed in the
NO
(Air Compressor will
not start) section?
YES
With the compressor on.
Regulator turned half way.
Is there air coming
out of the air
Pressure Relief Valve?
YES
Replace the
Air Regulator
395 FinishPro
Connect a test air gauge
to the air hose connector.
Start the compressor.
With the regulator
turned to Max.
Do you have 32psi?
YES
The compressor is ok.
See (Air Compressor will
not start) section?
Disconnect the air hose
from the air solenoid.
NO
Turn the compressor on.
Dose the compressor start.
YES
Repair or replace
the air solenoid.
Air Hose
GAUGE
Connection
Is there air coming
out of the air
NO
Pressure
Relief Valve?
YES
Repair or replace
Pressure
Relief Valve?
Replace the
NO
compressor.
REGULATOR
Exhaust Port
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.
Is there air coming
NO
out of the air
solenoid exhaust?
YES
Repair or replace
the air solenoid.
Repair or replace
the air compressor.
32psi. Pressure
Relief Valve.
The valve will open when the
compressor builds over 32psi.
This is a normal function.
Air Solenoid (N/O).
NO
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