My wife just called me and said my Tunze 6100 is beeping at the driver end? It sounds like an alarm of some sort but what is this noise all about. She said it is coming from the driver and not the multicontroller. Do they have an alarm? Does that mean pump failure? I bought them from a fellow reefer and he said they were only a year old. I have had for two months running with no problems. Any help with this would be appreciated.