YES
Motor will not shut off:
Unplug sprayer turn the
prime/spray valve to the prime
position. Plug sprayer in, once
material comes out of the prime
drain hose turn the prime/spray
valve to spray. Does fluid stop
for a moment and then come
though?
NO
Defective pressure
control switch.
Replace.
Unplug sprayer turn the
prime/spray valve to the
prime position. Plug sprayer
in, once material comes out
the prime drain hose turn
the prime/spray valve to
spray. Does fluid continue
to flow though the drain
hose?
Check the Inlet and Out
valves for a stuck ball,
See freeing up inlet and
outlet check valves. If
ok check the packing
for wear or damage,
replace if needed.
Defective Prime
Spray Valve.
Replace.
Put the sprayer in the prime
position. Remove the control
board cover, turn the sprayer
on and then unplug the
pressure control switch. Does
the motor stop running
NO
NO
YES
YES
Defective control
board. Replace.
FinishPro 390
Control Board 261779
15
