Most Common Faults in VRF Systems

VRF systems, despite their high reliability, face recurring faults that can be quickly diagnosed with the right tools and understanding of error codes.

1. Low Refrigerant Pressure

Symptoms: Weak cooling, error code E3/E4

Causes: Refrigerant leak, faulty expansion valve

Technician checking VRF refrigerant pressures
A technician using a pressure gauge to diagnose a fault in a VRF system

Common Error Codes Table

Error Code Description Solution
E1 High pressure error Check condenser + airflow
E3 Low pressure error Check for leaks + expansion valve
E6 Communication error Check data cables
U0 Low refrigerant Leak detection + recharge
H6 Fan motor error Check motor and capacitor