So I bought one of these to help keep my room the right temp for my tarantula. I like this brand and I think they're awesome but I noticed that this specific heater has a issue with not wanting to work 100% of the time. I'm not sure what fixed it but I took it apart and then put it back together making sure all of the wires and screws were tight and it now works perfectly fine.

Another thing is make sure that its plugged directly into the wall and is sitting on a solid wood floor as the offset from sitting on carpet can sometimes trigger the tilt sensor thing.