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NFPA 72-2025
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GNDFLTtrouble

Notifier NFS2-640: GNDFLT

Notifier NFS2-640·1 view·0 field notes

What This Code Means

There is a ground fault on the main or auxiliary power supply.

Common Causes

  • 1Ground fault on the main power supply
  • 2Ground fault on the auxiliary power supply

Resolution Steps

Correct the fault.

Manual References(4)

1notifierNFS-640Operations2003Open
2notifierNFS2-640Operations2013p. 72Open
3notifierNFS2-640Datasheet2017Open

Field Notes

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Related Codes

INVREPThe device has returned a response to the panel that the panel did not expect.Low Chamber valueA maintenance warning level indicating that the detector chamber reading is too low, which typically signifies a hardware malfunction.INST ON L1No devices are installed on the system.STYLE 6 POS. LOOP xThere is an open circuit on the positive side of loop x.FREEZE WARNINGThe temperature read by a Heat+ or Acclimate Plus™ detector has dropped below the low-temperature threshold, typically 40°F (4.44°C).

Related Questions

What batteries does the NFS-320 use, and when is an external battery box required?How does the NFW2-100 ground fault detection work?What are the main differences between the NFS-320 and the NFS2-640?
All NFS2-640 trouble codesNFS2-640 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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