AWC with max on time error on Doser max 2

I have set up operational mode ATO & AWC with a 10-minute max on time and "Reset error automatically" is checked.

10 minutes is the max time I can set for an error since the level on the aquarium is near the top of the glass and this is the max time I can set in case ATO function fails.

AWC stops after 10 minutes with error (fill up stops after 10 minutes, drain works ok).

Should that be the case?

I think that in the begging Doser max 2 was flashing with error (green/led light) during AWC but AWC was by passing the error and was stopping when reaching the sensor level.