Originally Posted by burnt toast
Suburban SF-35F model. I loosened off the fitting to purge the gas line at the furnace I am getting propane. I reset the master switch let it sit for five minutes did not help. Continuity check to Highlow switch was completed showing zero 00.5 at 68°F. There is no sail switch it appears to be electronic I'm thinking it's the board what do you think?
Hi you checked the continuity of the high limit and it showed 0.5 ohms of resistances. This tells me that the hi limit is good and that the switch in the hi limit is closed and will let electricity flow to the ignition board. If you can trace the wire from the high limit to the ignition board and you have 12 volts there to the board. If you have 12 volts and no spark the board or the igniter/flame rod has a problem.
Hope this helps Tim