Graco 257100, Operation

Page: 19 / 32

Troubleshooting
3A0245A 19
Electrical Problems
Symptom: Unit does not run or stops running.
Perform Pressure Relief Procedure; page 6.
• Plug unit into correct voltage, grounded outlet
• Set power switch OFF for 45 seconds and then ON
again (this ensures drywall feed pump is in default
flow control mode).
• Turn flow control knob clockwise 1/2 turn
• Trigger learned controller
• View digital display
If no digital display is available, use the con-
trol board status light to troubleshoot prob-
lems. turn ON/OFF switch to OFF, remove
control cover and then turn power back ON.
Observe status light. Blinking LED total
count equals digital error code (example: two
blinks equals E=02).
To avoid electrical shock or moving parts hazards when
covers are removed for troubleshooting, wait 45 sec-
onds after unplugging power cord for stored electricity
to dissipate. Keep clear of electrical and moving parts
during troubleshooting procedures.
TYPE OF PROBLEM WHAT TO CHECK HOW TO CHECK
Drywall feed pump does not
run at all See flow chart, page 25.
Digital display is blank
Control board status light
never lights
Drywall feed pump does not
run at all Check transducer or transducer
connections. 1. Make sure there is no pressure in the system (see
Pressure Relief Procedure, page 6). Check fluid
path for clogs.
2. Make sure a minimum of 50 ft of hose is connected
to the unit.
3. Set drywall feed pump to OFF and disconnect power
to drywall feed pump.
4. Check transducer and connections to control board.
5. Disconnect transducer from control board socket.
Check that transducer and control board contacts
are clean and secure.
6. Reconnect transducer to control board socket.
Connect power, turn unit ON, set pump to PRIME
position, and turn control knob 1/2 turn clockwise. If
drywall feed pump does not run properly, turn unit
OFF and go to next step.
7. Install new transducer. Connect power, turn unit ON,
set pump to PRIME position, and turn control knob
1/2 turn clockwise. Replace control board if drywall
feed pump does not run properly.
Digital display shows E=02
Control board status light
blinks 2 times repeatedly