My Janitrol furnace repeatedly cycles when trying to ignite. I have changed the flame sensor, changed out the motherboard and checked out the tube that operates the pressure switch. Nothing gives to a solution and this has been going on for years. This year, I switched the burner under the flame sensor with one in the middle and that seemed to help. It somewhat improved, but it still seems to be falling into the same pattern slowly and surely, and has faulted at least once. I took a couple of videos and posted them for anyone who might want to take a look/see. They are here-> *.*/s/lne4hpc2f130h60/MVI_0050.AVI
and here -> *.*/s/zei050odkt7jig2/MVI_0052.AVI
. Thanks is advance.