Won't light. Here ya go. I have a 170t reddy Heater and have used it quite a bit this winter.

Question

Here ya go. I have a 170t reddy Heater and have used it quite a bit this winter. The other day it blew a fuse and I replaced it with the correct fuse. Now it will not light and the ignitor indiactor light comes on....so needing a heater I also have a 125t I used it very little this winter but I used it the other day and it ran off an on all day. The following day it would not light. However the fuse is fine in this unit but I am getting the ignitor indicating light again. Any Idea what is happening? Also burning a mixture of off road deisel and #2 fuel oil