TROUBL CONTROL: NFS2-640 Trouble Code | Fire Alarm Resource Center

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.

Manual References(1)

1notifierNFS2-640Operations2013p. 34, 75Open

Related Codes

INVREPThe device has returned a response to the panel that the panel did not expect.INST ON L1No devices are installed on the system.LO VALThe detector chamber reading is too low, or the detector is not operating properly. In CLIP mode, this may also indicate a failure of the thermistors, CO element, or infra-red element, or a freeze warning.PREALMThe control panel activates a Pre-Alarm Warning when a detector exceeds its programmed Pre-Alarm Alert or Action level, providing an early warning of incipient or potential fire conditions.NETWORK FAIL PORT xCommunication lost between NCM Port x and corresponding node.

Notifier NFS2-640

What This Code Means

Common Causes

Resolution Steps

Manual References(1)

Field Notes

Related Codes

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