Troubleshooting a/c with EATC

'88 TC, EATC. Worked last time I used it 3 weeks ago. Converted to R134a last year. Pressure switch on accumulator/drier is closed (no resistance across pins). I think the EATC isn't switching it on. I have noticed in the past it would take up to 5 minutes before engaging. Now it still wouldn't run the compressor after 30 minutes.

Any ideas on troubleshooting?

steve

From another post:

Found following info on this:Blinking of the VFD (temp display) or LEDs on control buttons is an indication that
the control head has detected a fault. You can test for the fault by simultaneously pushing the OFF/AUTO and DEFROST button, and then within 2 seconds pushing the AC button. An error code will be displayed on the VFDs. 88 or 09 indicates no fault found. If you get any other number post it here and someone can decode it from the manual (section 36-75-43)You can do this at anytime but ambient temp should be greater then 50 F

Kelly B

The EATC isn't flashing, so I'm pretty sure I don't have any codes to get.

steve