This has happened twice now, the auto air on 19 and after about 10 minutes it locks up, the a/c says it's still on but it's only vent forced outside air coming through and hot at that. None of the buttons work but the screens on as if operating normally. 19 seems to be the only temp that's done it. I've heard you can reset the a/c by pressing 2 of the controls buttons but can't remember which 2 and can't find a damn thing about it.

Help please!