Interesting. Do you think there was a drastic fluctuation in evaporation based on day vs night temps in the garage so the overfill alarm was going off? My understanding of the alarm is that it has some memory for the amount of time I needs to be on to get the water to the sensors level again. And if it has to go on for longer than average it will alarm.Keep getting in to alarm mode and I need to rest it, and i need to clean it often
And I only clean the optical sensor every few months and never had issues when it was in the return chamber of my sump or now that it is in the pump chamber of the AIO.
He had Smart ATO microWhich one did you have?