Posting your RV/TV specs really help with recommendations.
Your furnace probably is telling you the issue with the blinking lights - there is a list that tells you what they mean. I've had 2 failures similar to yours and they were the board.
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Danny and Susan wife of 55 years
2019 Ram Laramie 3500 6.4 4x4 CC 4.10 SRW
2020 Montana High Country 331RL
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