Climate Control EC Button, 96 C280

[forp]

Thanks to everyone for all the great posts. Hope someone can help with this. I just replaced AC compressor, drier, temp switch adn pressure switch. System is charged up and very cold BUT... now whenever I turn on the ignition the EC light is on and the compressor is disengaged. EC button does not go out with normal momentary pushing. I get it to turn off by holding it down for about 10 seconds, light goes out and compressor engages normally. The button now behaves normally, turning off/on as usual. Doesn't matter if EC light on or off when ignition turned off.
It is always on when the ignition is turned on and stays on until I hold the button. Thanks for any help, Dan