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Remove the sensor from the soil.
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Press the button on the sensor—if the LED doesn’t turn on, replace the battery.
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If the LED is on, move the sensor closer to the controller in case it’s out of range.
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If the sensor is next to the controller but still not sending data, contact support.
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If the sensor works near the controller but not in its original location, try placing it closer or adding a booster for extended range.