When the Sensor Status Light is continuously flashing rapidly, the AcuRite HUB device has not received a sensor reading for more than 60 seconds.
Make sure the sensor is in wireless range of the AcuRite HUB device. A sensor must be located no more than 330 feet (100 meters) from the AcuRite HUB device or PC Connect Display.
Make sure the sensor batteries are installed correctly and the sensor is powered. You may need to replace the sensor batteries.
Make sure the AcuRite HUB device is located at least 3 feet away from "noisy" electronic devices, including TVs and microwaves. Avoid locations that are near large stone or concrete surfaces and metallic surfaces.