TROUBL CONTROL: NFS2-640 Trouble Code | Fire Alarm Resource Center
TROUBL CONTROL
trouble
Notifier NFS2-640
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What This Code Means
A trouble condition occurring on a control/relay module or control/relay transponder.
Common Causes
1Open circuit on the module's supervised wiring
2Short circuit on the module's supervised wiring
3Device not responding due to being disconnected or faulty
4Incorrect addressing on the SLC
Resolution Steps
Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the panel sounder. Check the connections from the module to the input or output device to which it is wired for opens or shorts. Determine whether the device is functional, connected, and addressed properly on the SLC.