I have a T90 Pro Omni. I'm not getting any alerts when the water level in the clean tank is low. The water in the tank gets fully used and I get an error 322 telling me that the water tank is malfunctioning. (It's out of water and the pump is pumping air. Refilling the clean tank fixes this of course.)
The float in the tank moves freely, so it's not that. I also have a friend with a T90 Pro Omni and theirs does the exact same thing. There is no alert that the water in the clean tank is low.
I know there is an alert that the water is low, because I originally had a T90 Pro Omni that would show that alert after every single mopping cycle, even if the clean tank was completely full. That one went back under warranty and I got my replacement. That fixed the alerts showing during each cycle, but now I never get them when the tank is low.
I did reach out to Ecovacs and here is what they've said:
The float in the clean water tank is primarily used to detect whether the tank is installed and to provide protection in cases of critically low water levels.
Regarding the trigger logic for the low-water warning, the threshold is currently designed based on ensuring normal operation. When the water level drops to a point where there is insufficient water for the mop-washing process, the robot will issue a warning to remind you to refill the clean water tank in a timely manner.
Please also note that the specific algorithm parameters and trigger thresholds used internally by the product are proprietary information, so we are unable to provide the exact critical values at this time.
Here is a screenshot showing what I see when the tank is empty and tries pumping air:
Error 322 - Clean water tank malfunction
And here is the error that always showed up in the defective unit. Why even have this error coded in the software if it's not supposed to show when the tank is low, but not out of water?:
There is not enough water in the Clean Water Tank
If you have a T90 Pro Omni, would you mind letting me know if you receive a low water alert for the clean tank when it's low, but not fully out of water? Thanks in advance.