Help! I'm stuck in drain/fill mode January 15, 2021 16:14 Updated If your unit is stuck draining or filling, there may be something happening with your water level sensors. To check, please follow the instruction available in the article HERE. Still have questions? Please see HERE for how to contact us. Related articles How do I fix my water level sensors? Do I have to use Grobo brand nutrients? Can I dry my cannabis in a Grobo? When do my lights flip to 12 on/12 off? What cannabis yields can I expect?