Graco Pro 230ES Repair And Parts Manual page 15

Type of Problem
Motor is hot and runs intermittently
Building circuit breaker opens as
soon as sprayer switch is turned on.
CAUTION
Any short in any part of the motor
power circuit will cause the control
circuit to inhibit sprayer operation.
Correctly diagnose and repair all
shorts before checking and replac-
ing control board.
Building circuit breaker opens as
soon as sprayer switch is turned on.
This problem only applies to Pro
230ES model sprayers with brush
motors. They do not apply to Pro
270ES
Building circuit breaker opens as
soon as sprayer is plugged into out-
let and sprayer is NOT turned on.
3A2817A
What to Check
(if check is OK, go to next)
Determine if sprayer was operated
at high pressure with small tips,
which causes low motor RPM and
excessive heat buildup.
Be sure ambient temperature where
sprayer is located is not more than
90°F (32.22°C) and sprayer is not
located in direct sun.
All electrical wiring damaged insula-
tion and all terminals for loose fit or
damage. Also, wires between pres-
sure control and motor. See page
31.
For missing inspection plate gasket,
see page 29, bent terminal forks or
other metal to metal contact points
which case a short.
Motor control board by performing
control board diagnostics. See page
17. If diagnostics indicate, substitute
with a good board.
CAUTION: Do not perform this
check until motor armature is deter-
mined to be good. A bad motor
armature can burn out a good
board.
Motor armature for shorts. Use an
armature tester (growler) or perform
spin test. See page 22. Inspect
windings for burns.
Basic Electric Problems, page 11 of
Troubleshooting.
ON/OFF switch. See page 25. Be
sure sprayer is unplugged! Dis-
connect wires from switch. Check
switch with ohmmeter. Reading
must be infinity with ON/OFF switch
OFF, and zero when switch is ON.
Damaged or pinched wires in pres-
sure control. See page 29.
Troubleshooting
What to DO
(When check is not OK, refer to
this column
Decrease pressure setting or
increase tip size.
Move sprayer to shaded, cooler
area if possible.
Repair or replace any damaged wir-
ing or terminals. Securely reconnect
all wires.
Correct faulty conditions.
Replace with a new pressure con-
trol board. See page 29.
Replace motor. See page 33.
Perform necessary procedures.
Replace ON/OFF switch. See page
25.
Replace damaged parts. See page
29.
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