Hi..like to share my experience with a faulty EC light that will not illuminate.

First I thought it was oxydation of the button and I had not luck getting a rebuilt control unit from Programa. Was reading the forum between David,Steve, and Colin and David suggested to check the error codes from the system for other problems that Colin was encoutering.

I followed the same steps and once I reset or deleted the error messages from the control unit, I was able to sucessfully toggle the EC button to on and off..the compressor kicked in.....I did not have to go and buy a new or rebuid set....YES !!! Thank you guys !!!

Here is how I got it worked, thanks to David.....Steve....Colin

1/ Turn ignition key to 2nd position
2/ Adjust the driver side temperature to display "HI"
3/ Adjust the passenger side temperature to "LO"
4/ Simultaneously press buttons "Rest" and "EC" for five or more seconds.
All of this must be done within 20 seconds. The "Recirculate" button will flash its LED. The screen will then go blank, and the first code can be brought up by pressing the right "AUTO" button.
5/ Subsequent codes are retrieved by additional application of the right "AUTO" button.
6/ Eb1 234 will normally showed from the first screen, E (meaning Error)
7/ Keep apply application of the right "AUTO" button until you come to the screen showing "FF" on the right side of the screen.
8/ Press temperature up button from the passenger side and the temperature down button on the driverside. You will see the "E"(error) change to "d".
9/ Shut the ignition key to off position, wait 10 seconds, turn the igniton on and you can now shut off the "EC" mode.

Hope this helps if you ever encoutered the "EC" light on !!!!

Cheers