If you find the rain to be inconsistent even after the rain calibration. We may need to examine and clean the water pump. Assuming that you know how to disassemble and access the water reservoir.  If not please check the disassembly of the unit below:

https://www.smart-terra.com/components


Steps:


1. Turn off SmartTerra and unplug it


2. Drain out all or enough water from the reservoir so that it won't splash around while disassembling the unit


3. Disconnect the outlet hose by pull out the hose by the connector and position the pump for easy access.


4. Remove the grill cover by pulling it out  


5. Remove the inlet cover by the tab to get to the blade component



6. The blade should be loose and easily pull it out


7. Examine and clean the blade and the slot from any dirt. 

8. Put back the blade and turn it back and forth to make sure that it is spinning freely


9. Put everything back together and we are done