Try this: Resetting EC/controller - Turn ignition on. Set temp on high. Turn off ignition. Press and hold Rest. Turn ignition on. You should see --P or 00P. Wait five seconds or so. Restart/turn on ignition. This sometimes cures the EC stuck problem. It didn't get my compressor to fire, but it did reset my controller. Michael

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Michael
Southern California/Santa Monica
1986 MB 190D 2.5, 5 Speed Black and Palomino "Mordechai"
1985 Porsche 928S (32V), 5 Speed
1980 Porsche 928 (16V), 5 Speed