Genuine Daikin 1717844 Crankcase Heater is the 240 V, 33 W element that wraps the base of the compressor and keeps the oil warm through the off-cycle, driving out refrigerant that would otherwise dissolve into the sump while the unit sits idle. When it fails the oil goes cold and refrigerant collects in it, so the compressor starts against a diluted, foaming charge — a flooded start that strips lubrication from the bearings. For a few dollars against the cost of the compressor it protects, fitting the genuine Daikin element is the easy decision — matched to the correct wattage and footprint for the sump, where a generic heater can run hot or cold and leave the oil unprotected.