Troubleshooting
30
313221A
Pressure is higher on one side
when setting pressure with func-
tion knob.
Pump intake valve partially
plugged.
Clean pump intake valve. See
page 37.
Air in hose. Fluid is compressible. Purge air from hose.
Unequal size hoses or unequal
hose construction.
Use matching hoses, or balance
pressures before spraying.
Pressures are not balanced when
running, but pressure is gener-
ated and holds on both strokes.
Unequal viscosities.
Change temperature setting to
balance viscosities.
Change restrictor at mix point to
balance back pressure.
Restriction on one side.
Clean mix module or restrictor at
mix manifold.
Clean gun check valve screens.
Fluid leak in pump packing nut
area.
Worn throat seals.
Replace. See pump manual.
Pressure doesn’t hold when
stalled against gun in spray
mode.
Leaking Recirc/Spray valve.
Repair, page 36.
Leaking piston valve or intake
valve in displacement pump.
Repair. See pump manual.
Leaking gun shutoff.
Repair. See gun manual.
Pressure is higher on B side dur-
ing startup of recirculation, espe-
cially in High Recirc mode.
This is normal. Component B is
typically higher viscosity than
component A until the material is
heated during recirculation.
No action required.
One gauge shows half as many
pulses as the other when pumps
are cycling.
Loss of pressure on downstoke.
Intake valve is leaking or not clos-
ing. Clean or replace valve; see
page 37.
Loss of pressure on upstoke.
Piston valve is leaking or not clos-
ing. Clean or replace valve or
packings; see page 37.
Status indicator (red LED) not lit.
Motor Power switch off.
Cycle Motor Power off
,
then on
to reset breaker.
Loose indicator cable.
Check that cable is connected at
J10 pins 1 (red) and 2 (black) on
control board. See page 42.
Failed control board.
Replace board. See page 42.
A side rich; lack of B side.
A side gauge is low.
B side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix mani-
fold restrictor.
B side gauge is low.
B side material supply problem.
Check B side inlet strainer and
pump intake valve.
PROBLEM
CAUSE
SOLUTION