My Neato D 8500 beeped and had message to put "on" switch on.The switch was already set to "on". Upon checking the internet then Neato customer support twice, I was informed that Neato unit was problem and no remedy. They'd give me a 30% coupon for a new NEATO. My old NEATO is landfill, and not pleased with the outcome, User's recommendation: The NEATO worked perfectly till the battery went. If you like filling up landfills, but NEATO.