STYLE 6 SHORT LOOP x: NFS2-640 Trouble Code | Fire Alarm Resource Center
STYLE 6 SHORT LOOP x
trouble
Notifier NFS2-640
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What This Code Means
The control panel has detected a short circuit on the SLC loop configured for Style 6 or Style 7. The panel is driving both ends of the loop to maintain communication in an unsupervised method.
Common Causes
1Short circuit on the SLC loop wiring
2Faulty addressable device
3Incorrect wiring of ISO-X isolator modules
Resolution Steps
Locate and correct the short circuit condition on the SLC loop, then press the RESET button to clear the latching trouble. Ensure ISO-X isolator modules are used if the system is configured for Style 7.
