Not exactly sure what your trouble is but mine started to malfunction a while back.
It would light but it would go out almost instantly.
I checked everything and found that the wire for the igniter was pulled out a little so I pushed it in hard and everything worked fine. I pulled the wire out and it malfunctioned again. The wire has broken inside the ceramic end. I stripped off a little insulation and pressed it in hard again and it has worked fine ever since but I know I need to replace the igniter. I guess it senses the flame somehow when it is lit and if no flame present shuts off the system.
I have looked at all the parts stores and can not find the igniter Sure would be good to replace it one day.