[8L] Audi A3 8L clima problem

Hello,
I got an 2000' Audi A3 8L

Today I had the clima air conditioning on and it suddenly turned off , tried to switch it on again the light only flashes on clima board but not turning on , it keeps flashing everytime I press the button !
Here is a link attached with a video on youtube *

https://www.youtube.com/watch?v=cAI-8ekUe4c

What can I do to fix that or what could the problem be ?

Hi,
when it's cold outside,you can't switch on the conditioning.

Ok, wil try when the weather gets better again

Thank you