Troubleshooting
6-35
Part 1073401_07
E 2021 Nordson Corporation
No faults >
Ready LED is illuminated >
Not hot melt output from all applicators >
Motor is turning
T.4.2
Fill the tank.
Repair the pump or
manifold seals.
Refer to Section 7, Parts,
for service kits.
+
−
Is there hot melt leakage
around the pump or
manifold?
+
−
Is the tank isolation valve
closed? (No if D4L.)
See Figure 6‐2.
Turn the valve
counterclockwise to open.
+
−
Is the pressure control
valve turned fully
counterclockwise (no
pressure)?
Adjust the pressure control
valve.
Refer to Adjusting the
Pressure Control Valve in
Section 3, Installation.
+
−
Check and clean or replace
the pressure control valve.
Refer to Section 7, Parts.
Is the filter excessively
dirty?
Refer to Replacing the
Filter in Section 5,
Maintenance.
Replace the filter.
50‐mesh P/N 1021941
100‐mesh P/N 1028305
200‐mesh P/N 1021918
+
−
Is the tank empty?
+
−
Is the pump input shaft
turning?
Replace the
motor‐to‐pump coupling or
replace the shaft key.
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