I'm not the OP but did post about my AC-1511 fan (2021 Sunseeker) not shutting off when mode is on Auto... it does cycle through each fan speed but the fan runs continuously even after temp is reached.
I called Dometic this morning after email support ended w/o an answer...
She confirmed that on this unit, the fan was designed to never shut off and there is nothing that can be done to change that.
Go to wonder if this was their way of keeping the unit from freezing up