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Notifier NFS2-640

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What This Code Means

The 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.

Common Causes

  • 1Detector chamber reading is too low
  • 2Detector is not operating properly
  • 3Thermistors, CO element, or infra-red element failure on an FSC-851 IntelliQuad (CLIP mode only)
  • 4Freeze warning on an FSC-851 IntelliQuad (CLIP mode only)

Resolution Steps

The detector must be removed and replaced by an authorized service representative.

Manual References(2)

Field Notes

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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.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.STYLE 6 POS. LOOP xThere is an open circuit on the positive side of loop x.

Related Questions

What is the maximum device capacity on the NFS2-640 in FlashScan mode vs. CLIP mode, and can you mix protocols on the same SLC loop?How do I troubleshoot a ground fault on the NFS2-640 SLC loop?What are the NAC circuit specifications for the NFS2-640, and when do I need an external NAC booster panel?
All NFS2-640 trouble codesNFS2-640 panel page