Duo Therm 65900-001 sparking but not lighting?

thetundrawolf wrote:
Hi, I have an older trailer with a Duo Therm 65900-001 furnace, it's getting propane fine, and 120v, when I connect the thermostat wires the fan comes on, and it sparks, I hear the solenoids in the propane valve click on, and I see it sparking in the glass window, but it never ignites. Any ideas on why it's not igniting?