USAutomatic SENTRY 300 S User Manual (English)

Questions and Answers:

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Alexander GreenAug 14, 2025
How to fix USAutomatic Gate Opener remote control not working?
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  Daisy CooperAug 14, 2025
  First, remove and reconnect the J1 connector from the control board, then test the transmitter. If you don't hear a click, ensure you've completed the "Programming transmitter and Receiver" steps. Check and replace the transmitter battery if necessary. If the receiver light isn't on, ensure connector J1 is correctly connected to the control board. If the issue persists, the control board may be faulty.
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emilyloganAug 17, 2025
What to do if my USAutomatic SENTRY 300 S Gate Opener won't automatically close?
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  uyuAug 17, 2025
  First, press the “Open/Close Command “push button to confirm the gate closes manually. Check that control switch number 1 is turned “ON”. If a photo eye or safety accessory is connected to J2, verify its correct operation. Also, if the receiver P2 relay is set for latch open mode, press transmitter button 2 once, then transmitter button 1 once to see if the gate closes.
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Emily CochranAug 25, 2025
What to do if USAutomatic SENTRY 300 S gate 1 and gate 2 won't operate in dual gate installation?
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  Joseph KellyAug 25, 2025
  Ensure that control switches 3 and 4 are turned “ON”. Verify that the red and black wires on the Plug N Go harness are correctly connected to the battery. Check the battery charge; if you hear a clicking sound from the control board when pressing the “Open/Close Command” push button, the battery is likely dead. If the battery tests good, the control board is likely the problem.
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Ariana MartinAug 27, 2025
Why does my USAutomatic SENTRY 300 S auto open instead of auto closing?
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  Tamara SimmonsAug 27, 2025
  The open time can be adjusted using the auto close timer. If installed in a pull-to-open configuration, ensure control switch number 2 is turned “OFF”. Readjust the close limit for gate 1 or gate 2 to the correct stop position. Check the linear actuator harness for cuts or nicks, as this could affect the current sense circuit on the control board. Also, verify the correct installation of the gate bracket and linear actuator bracket, correcting as needed.
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Tammy SchneiderSep 3, 2025
Why does my USAutomatic Gate Opener stop and reverse after a few seconds?
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  Jeffery MartinezSep 3, 2025
  The sensitivity circuit may be detecting an obstruction. Check the gate's path for any obstructions. Also, verify that the hinges are not binding and the gate isn't contacting the ground. Adjust the sensitivity setting toward the minimum, ensuring that the Gate 1 and Gate 2 adjustments are set the same on a single gate installation.
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patricia51Sep 6, 2025
What to do if USAutomatic SENTRY 300 S photo-eye won't reverse gate or hold it open?
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  jacksongregorySep 6, 2025
  Begin by inspecting the accessory wiring. Ensure the accessory is wired correctly, with the N/O wire connected to J2 pin 5 on the Sentry control board. Verify the control switch “Operating Direction Reverse” switch is set to the correct position.
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Amy SmithSep 10, 2025
Why is the USAutomatic Gate Opener transmitter range so short?
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  amanda03Sep 10, 2025
  Try replacing the batteries in the transmitter. Make sure the receiver antenna (the short wire connected to the receiver) is not twisted or rolled up. Radio frequency interference may be obstructing the signal from the transmitter to the receiver.