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Nfs2 640
Freeze Warning

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Troubleshooting Tip

When diagnosing codes, always check the event history log first. Many trouble conditions are intermittent and tied to environmental factors like temperature or moisture.

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FREEZE WARNING: NFS2-640 Trouble Code | Fire Alarm Resource Center

FREEZE WARNING

trouble

Notifier NFS2-640

72 views·0 field notes

What This Code Means

The temperature read by a Heat+ or Acclimate Plus™ detector has dropped below the low-temperature threshold, typically 40°F (4.44°C).

Common Causes

1Ambient temperature in the area of the detector is too low
2Heating system failure in the protected area

Resolution Steps

Raise the heat in the area of the detector to bring the temperature above the 40°F (± 5°F) threshold.

Manual References(2)

1notifierNFS2-640Datasheet2008Open

2notifierNFS2-640Datasheet2017Open

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.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.

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?

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