The washing arms does not get water in them and will not spin.
You will want to check to make sure that there is power getting to the circulation motor and if there is power to the circulation motor then check to make sure that there is nothing impeding the impeller. If the impeller is clear and no damage to it then the circulation pump would need to be replaced.
Do you have the impeller for this unit?
Answer Richard, I've found Bosch model SHE5AL05UC/05. The manufacturer does not offer the impeller separate from the circulating pump 00669135. Thanks.