00018critical
Low Refrigerant Pressure
refrigeration
Description
Suction pressure is too low, indicating possible refrigerant loss or restriction.
Activation Conditions
Suction pressure <-6.3 psig.
Unit Behavior
Shutdown.
Reset Conditions
Auto reset when suction pressure rises above 0.0 psig.
Corrective Actions
1. Visually inspect for refrigerant leaks (look for oil residue on fittings). 2. Run the automated Pretrip test. 3. Check the refrigerant charge level. 4. Initiate a manual defrost cycle — ice buildup on the evaporator can cause low suction. 5. Check the evaporator coils for blockage. 6. Check system pressures.