In the Personal Garden, the water pump and water level sensor are integrated. To determine when the water level is low, the Personal Garden checks for electrical current flowing through the pump. If it is below a certain amount, the Personal Garden infers that the sensor in the water pump has determined the water level is too low and has shut off the pump. The Personal Garden then alerts you via the water-level light and via a notification from the Rise Gardens app (if connected).
The Personal Garden will provide an identical notification if the pump is not plugged in.
If your Personal Garden is notifying you that your Garden's "water level is low" and your pump does not appear to be circulating water, the following troubleshooting steps may help.
With the pump submerged completely, unplug the pump from the control board and plug it back in. Do not remove the pump from the water. Then, press and hold the light button for 5 seconds. You should hear a “click” from the control board.
Carefully loosen the pump outlet tube. If it is too far in, it may be jamming the pump. Proceed with caution: if it becomes too loose, it may allow water to spray upwards. Then, press and hold the light button for 5 seconds.
Remove the plastic "grate" on the front of the pump with piers or a flathead screwdriver. Double-check that the rotor can spin freely. Then, reassemble the pump, place it back in the full tray, and plug it in. Press and hold the light button for 5 seconds.