Recently an old customer of ours called in and requested service for 20 year old Bosch washing machine that was not completing cycle. After arriving on site and talking to customer it was confirmed that washing machine would complete some cycles but usually stops mid cycle or towards the end of cycle and shows an error message 13. Customer also advised that when washer stops, water is not drained or not drained completely. After a quick search of the error it was determined that error 13 pertains to washer not being able to drain water in appropriate time. First thing in this situation was to drain the washer manually to access coin trap of the washer to check for obstructions. After quickly removing water using shop vacuum coin trap was removed to find no obstructions or debris. While coin trap removed, technician checked drain pump impeller for excessive play and confirmed that impeller is in fact loose which causes intermittent drain issue. After receiving confirmation from customer, new drain pumps was ordered and installed the following day.