Reddy Heater will not ignite flame

Question

Have an older Reddy Heater Pro 110. Some years ago it was being used and ran out of K1 fuel while being used. If you plug it into the outlet (with a full tank of K1) only the fan works. Looking for suggestions about fixing the heater. I did take apart the heater and the only thing that I can see could be wrong is a black "box" under the fan (ignitor starter circuit) or somewhere there is a fuse or maybe a pump failure ? Has anyone had this problem ? Thanks.