Notifier NFS2-640

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What This Code Means

Indicative of dust accumulation that is near but below the allowed limit.

Common Causes

1Dust accumulation
2Environmental dirt buildup in the detector chamber

Resolution Steps

The detector performance may be compromised. The detector should be cleaned or serviced by an authorized representative to prevent it from reaching the 'Maintenance Urgent' threshold.

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.