I found out, tonight, that mine has the same issue. 10 F right now, same error code.
Waiting for it to heat up with a votive candle (getting there slowly), not what I expected when I purchased this less than 2 months ago.
I may just return it to Lowes or exchange it.
I saw one of the new larger units with the remote when we stopped at Sams in St. Louis, kinda liked it.