10-20 min · 7 steps
VRF: Inverter / Compressor Drive Fault
Diagnose a VRF inverter overcurrent / DC-bus / IPM fault — supply, compressor, board cooling, or the PCB.
First step
Is the incoming supply voltage present and within nameplate tolerance on all legs, measured UNDER load?
No — low / imbalanced / missing
Yes — supply good
This is a preview of the first step. Run the full interactive diagnostic free — it walks you all the way to the likely root cause.