I have no experience with these but I found this...
Flow sensor/meter manufacturer Number DD32-00004A
4E or low flow errorDishwashers
were produced with an incorrect water flow meter. The water flow meteror impeller controls the amount of water insidethe tub assembly. Specifically, the flow meteraxle shaft was designed to have a 2.5 mmclearance width. The axle shaft was changed to1.5 mm spacing in error. The smaller gapcauses the impeller to touch the base of the housing, restricting water flow. The problem is morepronounced where the water pressure is lower.
SYMPTOM: Depending on the water pressure the symptom the unit will show error code 4E,indicating the water level in the tub is too low. This will occur on the first operation in low waterpressure environments. In high water pressure installations, the 4E error may be intermittent.
Solution – The repair for this issue is to replace the entire flow meter assembly which includes the
impeller and the impeller housing.