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Low Chamber value
maintenance

Notifier NFS2-640

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What This Code Means

A maintenance warning level indicating that the detector chamber reading is too low, which typically signifies a hardware malfunction.

Common Causes

  • 1Hardware problem in the detector
  • 2Detector chamber reading is too low
  • 3Detector not operating properly

Resolution Steps

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

Manual References(1)

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.

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