Problem is fixed after running diagnostics and erasing all faults! EC button is functioning again, although fault B1422 is recurring, but it's another story.

The refrigerant pressure readout is 13 so it should be OK, I guess.

Thanks a lot!

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE