Is the System Sensor 5602 a self-restoring detector

Enhanced Combatibility: Optimized for a wide array of non-flammable HFC refrigerants and HCFCs

It utilizes a 36-inch copper capillary and a 3/16" x 11-1/2" nickel-plated bulb for precise thermal sensing

The 325-3L is certified for 2 PSI inlet systems

the sensor is likely the culprit

Nordyne 664346R TXV Valve R-134A Is the System Sensor 5602The Nordyne 664346R TXV Valve is a technical grade OEM thermal expansion valve designed for precision metering in 4 ton R410A outdoor HVAC systems. As the direct engineering replacement for the legacy 664346, this N Series valve provides critical modulation of refrigerant flow to maintain targeted evaporator superheat. In high demand residential and commercial applications, the 664346R (also cataloged as AC Pro 47953) effectively balances system