Graco Mark X 240 Volt Instructions Manual page 32

Electrical
DIGITAL CONTROL BOARD
DISPLAY STATUS LIGHT
Displays high
pressure when
prime valve is
open and there
is no pressure
in sprayer
E=02 Blinks 2 x repeatedly
E=03 Blinks 3 x repeatedly
E=04 Blinks 4x repeatedly
32
INDICATION
- Improper pressure
signal to control.
Control board is
receiving excessive
pressure signal
from transducer.
Transducer may be
damaged or fluid flow
path may be clogged.
Transducer or trans-
ducer connection
error.
High Line Voltage
> 255 VAC
WHAT TO DO
Open prime valve. Connect a known good transducer in
place of the sprayer transducer. Set sprayer ON. Replace
transducer If sprayer runs. Replace control board If sprayer
does not run.
1 Check fluid path for clogs, such as a clogged filter.
2 Open prime valve.
3 Use airless paint spray hose with no metal braid,
3/8 in. x 50 ft minimum. Smaller hose or metal braid
hose may result in high-pressure spikes.
4 Replace transducer if fluid path is not clogged and
proper hose is used.
1 Check transducer connection.
2 Disconnect and reconnect transducer plug to ensure
good connection with control board socket. Check that
transducer contacts are ok.
3 Open prime valve. Connect a known good transducer
in place of the sprayer transducer. Set sprayer ON.
Replace transducer If sprayer runs. Replace control
board If sprayer does not run.
Ensure line voltage is below 255 VAC.
Troubleshooting
312649E