I've had my MTS211Si for a few months and have several total hours of use on it in all three modes. I'm in the middle of a new project and noticed the mig wire wasn't feeding, but it started working and I figured I was missing something. While tacking things together there was some strange behavior and sputtering now and again but I ended up finished up for the night. Today I went back into the shop and the welder wouldn't feed at all. I took off the cover and looked for obvious loose connections with no luck. When pulling the trigger, the solenoids click and gas flows but there was no voltage to the drive motor. I kept at it and every once in a while it would turn a bit and then stop and go again. When this was happen I measured voltage at the motor and it would jump around and then go to zero when it would stop turning. It usually doesn't work at all though. Power cycling and switching between the modes does not seem to help.

Any advice? I need to get this fixed quickly so I can finish up this project. Thanks in advance.