Refrigeration 101

[Gary]

Something like e.g. - low suction superheat - is a symptom, not a diagnosis. In my opinion, these systems are not self-diagnostic.

When they can say things like - insufficient evap airflow, or liquid restriction, or refrigerant overcharge, or inefficient compressor, etc, etc. etc... then I will be impressed.

BTW, I know this can be done. I wrote a program to do this back in the 1980's. Nobody was interested.