I recently baught a Paulin 5,500 plus mini-heater for my shanty. The instructions say to light the heater and hold the button in for 30 seconds, then it should run on it’s own. Both times I have used it, I had to hold the button for 5 minutes or more and it still wouldn’t take off in some instances. I exchanged the heater and got a new one. Has anyone else experienced this problem or have any suggestions on something that I may have done wrong??