Hosting.com said human error was responsible for a data center power outage that left more than 1,100 customers without service. The downtime occurred as the company was conducting preventive maintenance on a UPS system in the company’s data center in Newark, Del. “An incorrect breaker operation sequence executed by the servicing vendor caused a shutdown of the UPS plant resulting in loss of critical power to one data center suite within the facility,” said Hosting.com CEO Art Zeile in a statement. “This was not a failure of any critical power system or backup power system and is entirely a result of human error.”