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Hi my name is Robert.....
Go to the main valve on the tank and shut it, slowly open it back up, sometimes if the valve is opened to fast then the regulator can lock up and you might not get the proper pressure... Light the burners on the stove and let them run for a few mins and then see if the furnace will start. Opening the valves at the stove should help get any air out of the lines. IF the furnace is not sparking after the fan comes on please let me know..... Robert
Sounds good, also listen for it trying to spark, if it is not sparking it is not a LP issue....
IF you are satisfied with my efforts please feel free to select a rating, it is the only way I get credit for helping, follow ups are included... Robert