288841Control Board; Airless Motor Will Not Start - Graco FinishPro 390 Repair Electrical Manual

Remove the
control box
cover. Turn
NO
the sprayer
on. Is the red
light flashing ?
YES
See Error
Codes.
FinishPro 395
288840 Control Board
Airless Motor will not run
See page 20 for the steps and illustrations.
Have the steps been
followed in the
(ON/Off Switch Test) section?
YES
See step 1.
Do you have
over 100 AC
volts?
YES
See step 2.
NO
Is there over
100 DC volts?
YES
See motor
test section.
See ON/OFF
NO
Switch Test.
See ON/OFF
NO
Switch Test.
See step 3.
Is there
continuity
through the
thermistor
wires?
YES
See step 4.
Does the motor run?
YES
Replace Potentiometer.
Pressure Switch
If motor is hot let
cool and retest, if
step 3 still shows an
NO
open replace motor.
The motor has a
defective
thermistor switch.
Connect a test
transducer to
the board.
NO
Does the
motor run
Yes
Replace the
transducer.
Replace the
Control
Board
21