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Nac 1 Fault

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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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Bell 1 circuit fault: MS-5024 Trouble Code | Fire Alarm Resource Center

Bell 1 circuit fault

trouble

Fire-Lite MS-5024

91 views·0 field notes

What This Code Means

A fault condition (open or short) exists on Notification Appliance Circuit 1.

Common Causes

1Broken field wiring
2Short circuit in notification devices
3Missing EOL resistor

Resolution Steps

Check NAC 1 wiring for opens or shorts. Verify the presence of the correct EOL resistor. Use Troubleshoot Mode to check circuit voltage.

Manual References(4)

1fire-liteMS-5024Installation1997Open

2fire-liteMS-5024UDInstallation1997Open

3fire-liteMS-5024Operating Instructions1994Open

Field Notes

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Related Codes

Annunciator FaultCommunication has been lost between the main control panel and a remote annunciator.AC Loss (shown only when requested)The AC ON indicator turns off and the trouble LED turns on when the AC line voltage drops below the Low Line threshold.SUPX (X=Zone Number)A condition indicating that a waterflow sensing device, its wiring, or a tamper switch is in an off-normal state.Ground faultThe control panel has detected that a supervised circuit, such as a zone or NAC, is in contact with earth ground.AC LossThe panel has lost AC power or the voltage has dropped below the brownout threshold.

Related Questions

How do I perform a walk test on the MS-5024 without triggering a full alarm?How do I set zone types on the MS-5024?What is the maximum SLC loop capacity of the MS-5024, and which Fire-Lite detectors and modules are compatible?

All MS-5024 trouble codes MS-5024 panel page