Another Furnace Problem II

[Tarfu]

The furnace in my '02 Sprinter, will spark and fire up when the air temp is in the low 70's, however in the cold mornings, mid 50's the fan will run, but it's not firing up....checked the propane stove and have a good flame....Bill

[trueweb]

Can you reproduce this consistently? If the day warms up will it start later in the day when it's warmer?

Not sure if it helps, but the limit switch that I just replaced to get mine working again is a temperature related switch that cuts it off if it gets too hot. Seeing as it's a temp sensitive switch perhaps that's a place to start.