I have an Amana model

I have an Amana model number pgb 30c09020. It quit working about a month ago and if you pushed on the fan on the combustion blower, it would come on and work for a while. They got the code and replaced the combustion blower. It worked a week or two and then it started going off. When it gets to the temperature, it kicks off and will not come back on. If you flip the breaker off and back on, it will come on. Also, if you leave the door off the flame will stay lit. If you put the door back on it, the flame will go off.