Make sure the propane valve to the furnace is open, it should be outside under the furnace area. Give it enough time to push all the air out of the line. You can get most of the air out by lighting a stove burner.
If it still does not light, you may need to pull the furnace out of the trailer. I have not done this yet, and it does not look like fun. I am guessing that you have a NT-22 furnace. I have attached the owners manual for that unit.
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Richard
Wally Byam Airstream Club 7513
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