Watch youtube videos before installing this - this is a typical Chinese diesel heater. The fan was already stuck out of the box - and thanks to youtube I was aware of this common issue before turning it on. You need to open the cover, pull it very hard without breaking it, and calibrate it. It is not something you can setup and use it over night. This is a complicated and tricky device that you need to learn how to assemble, hack it, how to config, how to prime it, etc. The instructions in the box are so bad - rely on other online material.At the end, it worked!