Most common cause for EC button always on is compressor is low on freon.

Pull the data and codes from the pushbutton CCU and post here for more help.

Actual values: Engine running, CCU set on auto and 72f, press and hold "REST" for 5 secs. use left auto button to toggle screens and post #1-8, the rest dont matter.

AC error codes: key to pos 2, quickly set the left temp to "HI" and right temp to "LO", press and hold "Rest" and "EC" for 5 secs. Must be completed within 20 seconds. If interrupted, turn ign off then back on and proceed on to next step. "Recirculate" button will light and CCU will go blank, codes can becalled up by pressing the right "AUTO" button.

typical code reads Eb....1234. Toggle through until you receive "FF" for no more codes. Post codes, if any.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)