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NFPA 72-2025
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CO TBLtrouble

Notifier NFS-320: CO TBL

Notifier NFS-320·1 view·0 field notes

What This Code Means

The CO element on the detector is not working properly.

Common Causes

  • 1CO element failure
  • 2Internal detector fault

Resolution Steps

Replace the detector.

Manual References(2)

1notifierNFS-320Operations2011p. 21, 68, 70, 5Open
2notifierNFS-320CDatasheet2017Open

Field Notes

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Related Codes

BAT.BACKUP RAMThe RAM battery backup voltage is low.DIRTY 1The detector is dirty and needs cleaning.BLOCKSomething has come between the beam detector and its reflector.Photo/CO (C Sup)Indicates activation of the CO element of a detector, which triggers the SUPERVISORY LED.Photo/COIndicates activation of the Photo, Heat, or CO element of a detector.

Related Questions

How does the NFW2-100 ground fault detection work?What battery size does the NFW2-100 require, and how do I silence a battery trouble condition after replacement?What batteries does the NFS-320 use, and when is an external battery box required?
All NFS-320 trouble codesNFS-320 panel page
Common Categories
System TroubleSupervisoryGround FaultNACCommunicationPowerDeviceNetwork
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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