On newer models the EC led will light if the system pressure or system temp are out of range. I'm not sure when that started but it probably applies here.
You might try viewing the actual values and/or fault codes. The directions can be found in the archives or the DIY article on A/C.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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