Maintenance Urgent: NFS2-640 Trouble Code | Fire Alarm Resource Center

What This Code Means

Indicative of dust accumulation above the allowed limit within a detector's chamber.

Common Causes

1Dust accumulation above the allowed limit
2Contaminated detector chamber
3Drift compensation has reached its maximum threshold

Resolution Steps

The detector's performance may be compromised. The device should be inspected, cleaned, or replaced by an authorized service representative to ensure it can still detect actual smoke and resist false alarms.

Manual References(1)

1notifierNFS2-640Datasheet2017Open

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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