When your Everchill 12V refrigerator's freezer works but the fridge compartment doesn't cool, it's typically caused by a faulty damper control, blocked air circulation, or temperature sensor issue. Start by checking the damper door between compartments and verifying proper airflow.
You likely have an incompatible control box model. The 9430A751 with dual SIG terminals is designed for true multi-zone systems, while your single-zone setup needs a simpler control box with one SIG terminal.
Micro-Air 355 wiring differs from RV Comfort.ZC for multi-zone operation. Zone issues likely from SIG1 and SIG2 wire configuration. Unused Yellow and Orange may be zone 2 controls. Contact Micro-Air technical support for specific wiring guidance.