Low Refrigerant Charge

System is undercharged, producing flash gas, low suction, and warm cases.

Symptoms

Bubbles / flash gas in the liquid line sight glass
Low subcooling at the receiver/condenser outlet
Low suction pressure and high superheat
Cases not holding temperature

Unlock the full fix

Likely causes, step-by-step troubleshooting & safety notes

Get the complete diagnostic guide for Low Refrigerant Charge — plus the full fault library, guided diagnostics, AI + photo diagnose, and CO₂ & R-290 reference. Start free, no card needed.

Start free See plans