Troubleshooting
3A3265B 23
Power switch is on and sprayer
is plugged in, but motor does
not run, and pump does not
cycle. (cont’d)
Material and/or water is frozen
or hardened in pump.
Unplug sprayer from outlet. If
frozen do NOT try to start
sprayer until it is completely
thawed or you may damage
the motor, control board and/or
drivetrain.
Make sure power switch is
OFF. Place sprayer in a warm
area for several hours. Then
plug in powercord and turn
sprayer ON. Slowly increase
pressure setting to see if motor
will start.
If material is hardened in
sprayer, pump or pressure
switch may need to be
replaced. Take sprayer to
Graco authorized service
center.
Prime valve is plugged Remove and clean prime
valve.
Gun is plugged. Disassemble and clean gun.
Sprayer continues to run when
gun trigger is released.
Pressure switch is damaged. Replace pressure switch.
Compressed air system leak. Locate leak; check gun, twin
line hose, or internal system.
Reseal leaky fitting or replace
hose.
Flow switch is stuck. Replace flow switch.
Sprayer does not start when
gun is triggered.
Flow switch is stuck. Replace flow switch.
Sprayer cycles ON and OFF
when trigger is released.
or
Sprayer cycles ON and OFF
when gun is triggered.
Pressure switch is damaged. Replace pressure switch.
Compressed air system leak. Locate leak; check gun, twin
line hose, or internal system.
Reseal leaky fitting or replace
hose.
Flow switch is stuck. Replace flow switch.
Check valve is damaged. Replace check valve.
Problem Cause Solution
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