Troubleshooting - Drive System
3A4637A Operation, Repair, Parts
57
Pump Control Status LED
LED Status
SPRAYER OPERATION
INDICATION
ACTION
Red LED
1 blink at power up
Power is applied. (Pressure
varies with tip size and
pressure control setting).
Normal operation.
Spray
Red LED
ON continuous
Sprayer won’t run.
Pump won’t cycle.
Ensure there is no resistor at J8/2 near
the center of the pump control board.
Red LED
2 blinks continuous
Sprayer stops. Engine is
running.
Exceeded pressure limit.
1.
Check fluid path for clogs, such as
clogged filter.
2.
Open prime valve and gun if running
AutoClean.
3.
Use Graco paint hose, 1/4 in. x 50 ft
minimum. Smaller hose or metal
braid hose may result in pressure
spikes.
4.
Replace transducer if fluid path is
not clogged and proper hose is
used.
Red LED
3 blinks continuous
Sprayer stops. Engine is
running.
Pressure transducer
faulty, bad connection or
broken wire.
1.
Check transducer connection.
2.
Disconnect and reconnect
transducer plug to ensure good
connection with control board
socket.
3.
Open prime valve. Replace sprayer
transducer with known good
transducer and run sprayer.
Replace transducer if sprayer runs
or control board if sprayer does not
run.
Green LED
ON continuous
Sprayer stops. Engine is
running.
Loss of paint to pump or
severe pressure loss.
1.
Check for empty paint condition,
clogged inlet strainer, failed pump or
severe leak.
2.
Reduce pressure and turn pump
switch OFF and ON to restart pump.