Running the floor loop right now and burning propane.
The oil furnace seems to have an issue with the flame sensor right now. Replacement is on its way, $20 new on Ebay for Honeywell brand.
Behavior changed when I disconnected it, hopefully it's the cause. It ignites and shuts off immediately and the flame sense light isn't coming on. If I disconnect it, it lights for 2-3 seconds instead of half a second.