Genuine Daikin 4025688 Scroll Compressor is the JT100G-VD@T scroll that sets the capacity of the outdoor unit under inverter control, with an accumulator on its suction line to catch liquid and a high-pressure switch cutting it out at 4.0 MPa. When it fails the unit loses compression and stops heating or cooling, commonly faulting the inverter on overcurrent as it loads a seized scroll. Because the inverter PCB and accumulator tend to be renewed in the same repair, having them on hand turns two visits into one — and the genuine Daikin scroll arrives charged and specified for this unit, where a substitute would leave you matching oil and windings yourself.