Originally Posted by Chuck31
Yep the fan comes on and then it does not light and then shuts off.
Does the furnace go through the normal start sequence? You should hear the fan for a few seconds, and if you are near the furnace, you would hear a distinct 'click' as the gas valve opens. if you are getting that far, then it's not getting propane.
The propane change was the event that triggered it seems.
I have had the OPD valve in the propane tank (on my grille) stick and not open, and it causes low or no propane pressure.
Try turning off and disconnect the hose at the tank, then SLOWLY and firmly screw it back on.