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

What This Code Means

The system enters System Trouble mode when the control panel detects an electrical fault or a trouble condition on a supervised circuit or module.

Common Causes

1Electrical fault
2NAC (Notification Appliance Circuit) trouble
3Panel Circuit trouble
4Control/Relay module or transponder trouble
5AC power loss
6Battery or charger failure
7Communication loss with annunciators or modules

Resolution Steps

Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the panel sounder and switch the SYSTEM TROUBLE LED from flashing to steady. Observe the LCD display for a specific Type Code and trouble message (e.g., AC FAIL, BATTERY, etc.) to identify the exact source of the fault and refer to the system trouble table for specific corrective actions.

Manual References(1)

1notifierNFS2-640Operations2013p. 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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