Operation
4-13
Part 1073401_07
E 2021 Nordson Corporation
How F4 Faults are Handled
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 and the optional I/Os.
Refer to Section 6, Troubleshooting, for information about diagnosing F4
faults.
5. The melter records the fault in the fault log. Refer to To review the fault
log later in this section.
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