Help with redsea 100mg/hr ozonizer

[wil0311]

I have a redsea 100 mg/hr ozonizer, it's the deluxe unit with the orp probe and controller. The problem is I used to be able to smell the ozone coming out and now I can't smell it at all even when I set it to 100 mg/hr and the orp set point to max. Do you think it's fubar or has anyone else had this problem and fixed it. How important is the air dryer for this thing?

Thanks in advance.
Jason