Graco SaniSpray HP 750, Instructions Manual

Page: 25 / 38

Troubleshooting
3A7939A 25
Troubleshooting
Unplug the power cord and follow the
Pressure Relief
Procedure
on page 15 before checking or repairing
your sprayer.
NOTE:
Check all possible problems and solutions listed
in the table below before disassembling the pump.
NOTE:
The status indicator (L) on the motor will blink if
an error is detected.
Problem Cause Solution
Pump output is low on
both up and down strokes Disinfectant supply is empty Refill the disinfectant supply and prime the pump.
* Clogged disinfectant outlet
line, gun, etc. The hose inner
diameter is too small. Clear the hose, outlet check valve, or gun; use the hose
with the larger inner diameter.
Worn piston packing Replace the piston packing. See your pump manual.
Inlet strainer is clogged (if
using suction tube) Remove and clean inlet strainer, then reinstall.
No output Improperly installed intake or
piston check valves Check and repair. See your pump manual.
Intake valve is clogged Clean the intake valve.
Disinfectant supply is empty Refill the disinfectant supply and prime the pump.
Pump will not operate Disinfectant supply is empty Refill the disinfectant supply and prime the pump.
* Clogged disinfectant hose,
gun, or spray tip Follow the
Clear Tip Clog
procedure on page 19, or clean
the hose and gun.
Motor parts are worn or
damaged Repair or replace the motor (see your motor manual).
Disconnect the Pump
(see page 29). If the motor will not
cycle and does not blink an error code, then troubleshoot
the motor or replace.
No pressure or flow Disinfectant is leaking from
the rupture disk Follow
Replace the Rupture Disc Assembly
procedure
on page 31. Do not replace with a pipe plug.
The inlet is clogged Clean the inlet. Clean the inlet strainer if using a suction
tube.
Motor does not turn on Over voltage (over 300 V) See the power supply requirements in your motor manual.
No power to the control
board Verify that the power supply is connected. Check the
junction box connections.
Output low on the down
stroke Open or worn intake valve Clear or service the intake valve.
Output low on the up
stroke Open or worn piston valve
packings Clear the piston valve. Replace the packings.
* To determine if a disinfectant hose or gun is obstructed, follow the
Pressure Relief Procedure
on page 15.
Disconnect disinfectant hose and place a container at pump disinfectant outlet to catch any disinfectant. Turn
pressure adjustment knob just enough to start the pump. If the pump starts, the obstruction is in the disinfectant hose
or gun.