Fiftybucks wrote:
just tried running furnace by bypassing all other connections. Blower starts, and runs for 2 min, exhaust is blowing out so that part is working but ignition fails, and shuts down. Apparently by bench test was not good, and going to pull it out again. What part / switch do i check for ignition?
On a SF30, the Hi limit switch wires go by the burner. IF those wires droop down and contac the burner, they will short out on the burner. THAT will cause the fuse to blow. When on the bench, if the furnace does NOT have the case removed from the RV, those wires will usually not short out until you reinstall it. IF that wire has been burnt and open that would cause a NO ignition. So, check those wires. Also, if the SAIL switch fails to close that will cause NO ignition also. Doug
