The EC switch turns off the compressor to revert the system to regular ventilation (no a/C). If the light stays on, your refrigerant charge is low, it is a failsafe mode.
Now, I just hope yourrefrigerant level is not low because of a leaking evaporator...
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A. Rosich
CL 500, 1998 
S 500 L, 1998 
E 320 T, 1995  [Sadly sold  ]
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