First unplug the aerator and check diffuser(s) to make sure they are not clogged. If diffuser(s) are not clogged, next check electric outlet to make sure it is getting power. If the outlet is in working condition, then you will want to check the condition of the diaphragm. See "How to replace diaphragm." If you find that the diaphragms are damaged or torn you will want to replace it. Please call Sanco Industries with additional troubleshooting issues.