The final story, in case anyone else run into same trouble, it was a hardware problem. When oppened the case of the carousel and plug it to PC running ASI Studio and selected it, it initially sounded a high pitch tone while initialization tried to move the motor but with no movement of the carousel (that was yesterday night)
This morning, after two coffees , I removed the only 31mm filter I had with mask (rest of the filters are mounted), thinking that the previous time I touched it I did something wrong. I tried again and it worked!!
It seems it is persistently working back again once I removed the 31mm unmounted/masked filter. Maybe one screw was too tight and prevented the carousel from moving.