Clear/Reset key
Heater key
Operation
4-14
Part 1126931_01
2018 Nordson Corporation
F4 Fault
When the melter detects an F4 fault:
1. The ready LED turns off and the red fault LED turns on.
2. All of the component key LEDs (tank, hose, and applicator) turn off.
3. The right display indicates F4.
4. The left display indicates a sub‐code. Sub‐codes classify the fault as
being fatal or nonfatal. The affect on the melter of each of these two
classes of F4 faults is:
Fatal—The fault LED turns on and stays on and the melter stops
functioning completely.
Nonfatal—The fault LED turns on for five seconds, but the heaters and
pump continue to operate normally. Nonfatal faults affect the internal
clock.
5. The melter records the fault in the fault log. Refer to Monitor Melter Faults
in this section.
Resetting the melter
1. Diagnose and correct the fault condition. Refer to Section 6,
Troubleshooting, for information about diagnosing and correcting fault
conditions.
2. Return the melter to the automatic scan mode by pressing the Setup key
twice.
3. Press the Clear/Reset key.
4. Press the Heater key to turn on the heaters.
If F4 appears in the right display when you press the clock key, the internal clock function
has failed.
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