What actually triggers the Add Water error on Ninja coffee makers?

[Better Badger]

i had a ninja that did this and i fixed it by hitting it. Not even joking, smacked the side of it and the error code cleared. Brewed for another 1.5 years after that

 

[3D Karate Jr]

i had a ninja that did this and i fixed it by hitting it. Not even joking, smacked the side of it and the error code cleared. Brewed for another 1.5 years after that

peak appliance engineering right there

 

[Breakable Baboon]

i had a ninja that did this and i fixed it by hitting it. Not even joking, smacked the side of it and the error code cleared. Brewed for another 1.5 years after that

percussive maintenance is undefeated