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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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INVREP: NFS2-640 Trouble Code | Fire Alarm Resource Center

INVREP

trouble

Notifier NFS2-640

136 views·0 field notes

What This Code Means

The device has returned a response to the panel that the panel did not expect.

Common Causes

1Device functionality issues
2Incorrect addressing
3Wiring issues

Resolution Steps

Check the device for functionality, addressing and wiring.

Manual References(2)

1notifierNFS2-640Operations2013p. 72Open

2notifierNFS2-640Datasheet2017Open

Field Notes

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Related Codes

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.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?

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