Kidde Fire Systems ARIES NETLink

Questions and Answers

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Raymond KlineAug 14, 2025
How to fix AC INPUT FAULT on Kidde Fire Systems Control Unit?
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  perezdavidAug 14, 2025
  If the AC INPUT FAULT is on for your Kidde Fire Systems Control Unit, it could be due to a loss or degradation of primary power. First, notify your commercial light and power company about the service loss. Then, check the connections to the Power Management Unit (PMU) Board TB1, using a voltmeter to ensure you're getting the nominal 120/240 Vac at TB1. If this doesn't resolve the issue, remove both secondary and primary power, disconnect all field wiring (after labeling them), and ensure the AC Selector Switch on the power supply unit is correctly set for your line voltage. After checking the switch, reinstall the board, reconnect the field wiring, and reapply power. Finally, perform functional tests to confirm the system is working.
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Alison HartAug 17, 2025
What to do if BATTERY DISCONNECTED FAULT is on Kidde Fire Systems Control Unit?
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  Eileen WhiteAug 17, 2025
  If the BATTERY DISCONNECTED FAULT is on for your Kidde Fire Systems Control Unit, it might be due to a faulty or reversed battery connection, or no batteries connected at all. Here's what you can do: * Check the battery connections to the Power Management Unit (PMU) Board J10. * Disconnect the battery leads from the PMU Board J10 and use a digital volt-ohm meter to measure the battery's open-circuit voltage. If it's less than 22 Vdc, replace the batteries. * Also, check the fuse on the PMU Board and replace it if it's blown.
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vhughesAug 20, 2025
How to troubleshoot BATTERY CHARGER FAULT on Kidde Fire Systems Control Unit?
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  Juan FrancoAug 20, 2025
  If the BATTERY CHARGER FAULT is on for your Kidde Fire Systems Control Unit, it indicates a failure in the battery-charging circuitry. To address this: 1. Check the battery connections to the Power Management Unit (PMU) Board J10. 2. Disconnect the battery leads from the PMU Board J10 and use a digital volt-ohm meter to measure the battery's open-circuit voltage. Replace the batteries if the voltage is less than 22 Vdc. 3. Check the fuse on the PMU Board and replace it if blown. 4. Replace the power supply unit. 5. Replace the Power Management Unit (PMU).
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Brendan HendersonAug 25, 2025
What causes PMU GROUND FAULT +VDC on Kidde Fire Systems Control Unit?
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  Nicole SmithAug 25, 2025
  If the PMU GROUND FAULT +VDC is on for your Kidde Fire Systems Control Unit, it means there's a low impedance path between the positive field conductor and earth ground. Here's how to troubleshoot: * Use the control unit menu to view the ground fault offset voltage. * Use the control unit menu to execute the Find Ground Fault option. * Continuously monitor the DC voltage between the earth-ground stud and the PMU J9 (-) terminal, it should be nominally 6.6 Vdc. * If the menu operation doesn't locate the fault, remove field circuits one at a time until the earth-ground offset voltage restores to 6.6 Vdc. * Check the field circuit you removed for connections to earth ground. * If applicable, disconnect the USB port-to-PC connection and check for the ground fault.
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Katherine EdwardsAug 27, 2025
Why is PMU GROUND FAULT -VDC on Kidde Fire Systems Control Unit?
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  Corey KingAug 27, 2025
  If the PMU GROUND FAULT -VDC is on for your Kidde Fire Systems Control Unit, it indicates a low impedance path between a negative field conductor and earth ground. To resolve this: * Use the control unit menu to view the ground fault offset voltage. * Use the control unit menu to execute the Find Ground Fault option. * Continuously monitor the DC voltage between the earth-ground stud and the PMU J9 (-) terminal, it should be nominally 6.6 Vdc. * If the menu operation doesn't locate the fault, remove field circuits one at a time until the earth-ground offset voltage restores to 6.6 Vdc. * Check the field circuit you removed for connections to earth ground. * If applicable, disconnect the USB port-to-PC connection and check for the ground fault.
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Heather ParkAug 30, 2025
How do I fix PMU# PSU1 NOT PRESENT on Kidde Fire Systems Control Unit?
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  Danielle FordAug 31, 2025
  If the 'PMU# PSU1 NOT PRESENT' is on for your Kidde Fire Systems Control Unit, it means the PMU isn't detecting a power supply unit on connection 1. Check the PSU connection and measure the PSU #1 output voltage at terminals 4 & 5. The voltage should be 27.6 Vdc.
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angelica62Sep 2, 2025
What does PRINTER SUPERVISION FAULT on Kidde Fire Systems Control Unit mean?
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  Thomas MarshallSep 2, 2025
  If the PRINTER SUPERVISION FAULT is on for your Kidde Fire Systems Control Unit, it indicates a communications problem between the printer and the control unit, or the USB printer is indicating it's out of paper or offline. To solve this, check the RS-232/USB cable between the Main Controller Board and the printer. Make sure the printer is powered, connected, and ready to print. Verify that the RS-232 port assigned to the printer via the menu is correct. If no printer is used, disable the printer port.
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Mark McdonaldSep 6, 2025
What to do about SLC DEGRADE SIGNAL FAULT on Kidde Fire Systems Control Unit?
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  joshua09Sep 6, 2025
  If the SLC DEGRADE SIGNAL FAULT is on for your Kidde Fire Systems Control Unit, it indicates a communication or circuit board problem detected from the SLC module(s). You can download the event log using the PC configuration software and forward an electronic copy to Kidde Technical Services. Also, try re-initializing the control unit by removing and then reapplying the primary and secondary power sources. Finally, functionally test the system.
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Jonathan TateSep 9, 2025
Why does my Kidde Fire Systems Control Unit show PASSWORD NOT SET?
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  Rebecca MasseySep 9, 2025
  If the PASSWORD NOT SET is on for your Kidde Fire Systems Control Unit, it indicates that the Main Controller Board's self-test of the memory used for password data has failed. To resolve this, change the system passwords using the control unit menu. You can also download the event log using the PC configuration software and forward an electronic copy to Kidde Technical Services. Another step is to re-initialize the control unit by removing and then reapplying the primary and secondary power sources. Finally, perform a functional test of the system.