This can happen if the dial is turned too quickly. Please follow these steps to re-synchronize the system:
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Remove the receiver collar from your pet.
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Remove the battery from the receiver collar. Discharge all power by holding the correction level button down until the LED is no longer illuminated.
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At the transmitter, move the boundary switch from the "low" to the "high" position.
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Slowly adjust the boundary control dial up to 8, down to 1 and then back to the #4 position.
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Standing within 5-10 feet of the transmitter, reinsert the battery into the receiver collar.
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Walk out into your yard to test that the collar is recognizing the boundary. Use the test light tool or listen for the collar to beep.
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Once you are confident that the system is working, reset the transmitter controls to the original setting.
If the problem persists, please call our Customer Care Center.