Graco Mark IV 249636 Operation - Repair - Parts page 25

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
311287A
INDICATION
- Improper pressure
signal to control
Control board is
receiving excessive
pressure signal from
transducer. Trans-
ducer may be dam-
aged or fluid flow
path may be clogged.
Transducer or trans-
ducer connection
error
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 and gun if running AutoClean
3 Use airless paint spray hose with no metal braid, 1/4 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.
Troubleshooting
25