I had a Herpstat 1 blow a fuse when I tried to plug it into an oil-filled radiator. I did not realize that the radiator was way to many watts... The Herpstat 1 has a soldered in fuse, so unless you can find a replacement fuse and are comfortable with soldering, you may have to send it back to Spyder Robotics to get it fixed. Some of the other models have a resetable fuse, so you will never run into this issue.

Hope this helps.