Troubleshooting
5-7
Part 1603227-12
E 2016 Nordson Corporation
Corrective ActionPossible CauseProblem
8. No purge air when
Purge button is
pressed
Malfunctioning spray gun display
module, gun cable, or iFlow
module purge solenoid valve; no
air pressure, or kinked air tubing
If display module does not show PU
when purge button is pressed, then
module membrane switch is
defective. Replace display module.
If display module shows PU:
Check the purge air tubing and
solenoid valve on the iFlow manifold.
Perform the Gun Cable Continuity
Test on page 5-11.
9. Low powder flow or
powder flow surging
Low supply air pressure Input air must be greater than 5.86
bar (85 psi).
Air pressure regulator set too low Adjust the input regulator so that the
pressure is greater than 5.86 bar
(85 psi).
Supply air filter plugged or filter
bowl full − water contamination of
flow controller
Remove bowl and drain water/dirt.
Replace filter element if necessary.
Clean system, replace components if
necessary.
Flow valve plugged (H24 or H25) See Proportional Valve Cleaning in
this section.
Air tubing kinked or plugged (H24
or H25)
Check flow and atomizing air tubing
for kinks.
Pump throat worn Replace pump throat.
Pump not assembled correctly Check and re-assemble pump.
Pick-up tube blocked Check for debris or bag (VBF units)
blocking pick-up tube.
Vibratory box feeder disabled
(VBF units only)
Set the Custom Function F01 for a
box feeder (F01−01). See Controller
Configuration on page 4-22.
Fluidizing air too high If fluidizing air is set too high the ratio
of powder to air will be be too low.
Fluidizing air too low If fluidizing air is set too low the pump
will not operate at peak efficiency.
Powder hose plugged Blow out powder hose with
compressed air.
Powder hose kinked Checked for a kinked powder hose.
Powder hose too long Shorten hose.
Gun powder path plugged Check powder inlet tube, elbow, and
electrode support for impact fusion or
debris. Clean as necessary with
compressed air.
Flow and atomizing air tubing
reversed
Check flow and atomizing air tubing
routing and correct if incorrect.
Continued..
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