If you "just filled the propane tanks" you may have introduced air into the lines and it will take a few cycles of ignition attempts to purge that air out of the lines. Then the furnace should work properly, provided you are connected to shore power and/or have a fully charged battery. I know this sounds "silly" but when you installed the filled propane tank, did you turn on the valve slowly and is the auto changeover valve pointed to the correct tank?
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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