Start with the basics, Gas charge.
If there is too much in the system the pot will overheat, this should be easy too see as the suction will frost back badly. System under charged not enough getting back to the pot & overheating it.
Probably best bet if you don't know the system is reclaim, remove drier and blow through with OFN, Change drier, vac & regas. At least this way you should have a better idea whats going on. Also keep an eye on the suction when running & when shutting down, that should give you an idea about how the compressor is. Experience tells me that aspera's dont like running hot.

Regards

Raymond