Still trying to figure that out. I've been having trouble with the A/C display unit and have only sorted it last night. I'm thinking it is controlled by one of the 3 buttons on the right side of the controller in conjunction with the controls in the rear arm rest. However, thats a project for another day.Pleased to hear the "A" is working. I had to recharge the accum's on mine.Cheers GregP.S How long have you had your Q?velvet hammer wrote:GDAY aussie LOL Thanks for the response. So does this purifier work when A/C is on?Yes its an active, and its awesome.