While driving, the "EC" light on the A/C panel came on. According to the manual, the "EC" indicates the a/c is running on "economy mode". Since the C220 has automatic temp control, I am unable to "disengage" the "EC" button - it stays on!

It was working before...When I set the auto temp to be at 72 degrees (or less), I can feel cold air which indicates the a/c is working and when i press the "EC" button on the a/c panel, I would just get normal outside air. But now whatever I do the the "EC" button, it remains lit. All the other buttons (eg recirc, defrost, defogger, etc) are working.

Has anyone ever experienced this problem?? Any info would be greatly appreciated.