Bosch wfk 2401?

My washer stops on the rinse spin cycle with a number 3 flashing on the read out. supposedly, this means the pump needs to be cleaned. not true. If put in the drain cycle, the water is gone from the drum in 90 seconds, which means the pump is working fine. After you go through the drain cycle, and then run the rinse spin cycle, the wash gets completed. Help. Jim S