Tunze Osmolator 3 help needed

[Chessmanmark]

Last week my Tunze Nano ATO stopped working after a decade of faithful service.

I bought the new ATO 3 and installed it today. I run it in my 40B w/o a sump. When I plug it in it pumps water but when the pump stops red lights blink on the sensor. As it is new there isn’t any salt creep on the sensor and I can’t find any resolution to my problem on Google.

I’m looking for advice on my next steps.

 

[Chessmanmark]

After trying different things I submerged the sensor deeper into the water and the light turned green.