JBJ ATO problem

[J3REEF]

Hey guys,

Been running a JBJ ATO for a few months now and has worked great until a few weeks ago.

Setup with one sensor in my sump and one sensor in a RO/DI reserve.

Recently the sensor in the sump isn't getting flipped off after it gets tripped to fill the tank and has emptied my RO/DI reserve into the sump/tank.

I just cleaned the sump sensor and did not notice anything blocking or impacting its ability to move the float up or down.

Could the sump senor be going bad?
Any ideas?

Thanks in advance.