compressor not coming on, no a/c codes

I posted this in the 3rd gen forum but didn't get much response. I recently looked at a 2010 that the compressor would not come on. All the lights turn off and on when the buttons are pushed except when I'm in active test, then I can't change anything at all. He just changed the compressor and then the amplifier with no luck. It will not set any a/c codes.
He said he pulled a vacuum prior to charging and it didn't leak.

Any ideas?