I'm having an a/c issue a new compressor has been installed and the clutch won't engage I was told as long as the EC light is on it won't i've tried the self test but the display is bad and I can't make out what it is reading. I've tried to reset it and it won't I was wondering if the controkl unit could be bad.

 

i've tried to reset the fault codes but i doesn't thats why i was wondering if it could be the control unit because you can't read the display