'99 E320 V6

The EC button in the climate control panel is constantly ON and will not turn off. So, of course, there is no A/C.

The only code I have is for the secondary air injection system, I'm assuming there is no relation.

Any thoughts?

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)