My air con does not work!

The compressor doesn't kick in but works when I apply direct 12v to it and then the system blows cold.
It is gassed and has enough pressure in it.
renewed the outside temp sender as the old on was reading 65 degrees under ambient!
No error codes when pressinf AUTO & OFF.

So me thinks its an electrical issue. Fuses and relays seem ok.

What next?