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Can you provide complete model on furnace?
There are several models within the Freedom 80 series. Most will have 2 flame rollouts, a mai limit and an auxiliary limit. Follow the yellow wire from HL0 to first one.Bypass that one and see if error code will go away. If not follow yellow wire to second, then flame rollouts, etc until you find where the break in the circuit is all the way back to HL1.
Locations should be in furnace heat exchanger vestibule, on top of burners, and blower housing. There has to be a limit or a break in that circuit somewhere since you can jump and make it work.
If it does not worked with the circuit closed but still says limit open, that is correct.Bad board.
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