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Bell 1 circuit fault
trouble

Fire-Lite MS-5024

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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)

Field Notes

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Related Codes

Annunciator FaultCommunication has been lost between the main control panel and a remote annunciator.Ground faultThe control panel has detected that a supervised circuit, such as a zone or NAC, is in contact with earth ground.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.Low batteryThe standby battery voltage is below the critical threshold required for proper operation.DrillThe fire drill function has been manually activated to test notification appliances.

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 codesMS-5024 panel page