Notifier NFS2-640

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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

Field Notes

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Related Codes

INVREPThe device has returned a response to the panel that the panel did not expect.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.INST ON L1No devices are installed on the system.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.TROUBLThe system enters System Trouble mode when the control panel detects an electrical fault or a trouble condition on a supervised circuit or module.