Re: Adler Barbour CU-100 short cycling
Did he add any refrigerant? Sounds like you have a leak and it is freezing up. (as odd as that sounds) That would explain somewhat why it works on weekends only and for 3 weeks only. You need a more competent technician. The person should be able to precisely tell you what's going on.
Find a competent HVAC guy that works on commercial/residential refrigeration. IT doesn't have to be a marine technician. In fact generally i avoid marine technicians unless i know they are exceptionally qualified.
In the end; you most likely will have to switch out the "compressor" units as this most likely will be the easiest fix if you are having issues. I''m thinking you have the dual units; not cheap.(4k) How long would you expect your refrigerator at home to work?
I'm NO HVAC tech (did work in the trades for 20 yrs though); i had my HVAC buddy work on my boat for free. He's sharp! Filled me right in. In the end; new units.