Sounds like an inverter fault. We have had those in the past and with one of our little 3016s we sent in the inverter to Practecllc.com They do a great job of diagnosing and fixing the inverter. You do not want or need to buy another one!!
But before you go that far make sure the power is off and check the leads to ensure they are connected to the inverter unit. Sometimes after moving wires can get loose. When you get the error what does the Baldor unit say on the small screen?