Nordson ProBlue P4 Customer Product Manual page 158

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Is the tank empty?
−
+
Turn off the pump. Fill the tank.
Wait for the unit to heat the
adhesive to operating
temperature.
Is the isolation valve (shut off
valve) closed?
−
See Figure 6-6.
+
Open the valve.
T.4
Starting conditions:
No faults >
Ready LED is illuminated >
No hot melt output from all guns
Is hot melt returning to the tank
through the return port located
−
behind the tank screen?
See Figure 6-3.
+
Replace the pressure
discharge valve.
P/N 1028308.
Check and clean the outlet of
the tank and the crossover
tube or clean/replace the
manifold.