Frigoboat system

My 2008 PY Cruiser has the keel cooled Frigoboat refrigerator system. One side works fine, but the aft compartment doesn't cool. The thermostat (type shown below) has some of the temp setting number lights out on it so I'm wondering if that could be the problem?


How do I troubleshoot this system?

Thanks!!

Whether or not the temperature setting light failure is an issue might need to be answered by Frigiboat directly.

I downloaded or had emailed to me by Frigiboat some very useful troubleshooting manuals. Contacting Frigiboat directly is worth the effort.

Will search for manuals online. Thanks.

Bill:
My wife , Pat, and I own Fully Involved, IPPY12. Bought her in 2007. We have two Frigaboat units, one for refrig and the other for freezer. Previously, we had a 420 that we had Frigaboat on her also.
To a large extent, we have had very few issues. We really have liked our units that we leave running almost year round.
Recently, however, one of the units was not maintaining temp properly and the sensor in the freezer box had to be replaced.
Fortunately, the marine specialist I use originally commissioned her is local so he took care of it. I would suggest you call me at 301-580-1900 so we can talk further.