When trying to use my raypack heater, i can hear the igniter clicking, then after a few seconds a explosion of some type and it actually blows the front cover off. It makes a buzzing noise and then when it tries to ignite again it does the same thing. i tried to ignite it once with the door off and was able to get it let and then it worked fine until i shut it down and tried to ignite again and then the same problem. i replaced the igniter tube and assembly last week and it worked great for a few days before this.