My Elkay EZFSTL8 water fountains abruptly stopped working this evening. They are located in a dance studio and get frequent use. They stopped working, the push buttons all work properly but of course nothing happens when depressed. I haven't heard the far or motor run since they've stopped working. I've also reset the breaker with no luck. Is there a sensor that shuts them off when they are misused or any other safety switch I need to be aware of? Any help and solutions would be appreciated. Thank you!