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My reply is not specific to your furnace so it might be different but all the t-stat is is a switch that is closed (so the circuit is closed and power is going to it) when it is cold enough for the switch to sense the temp change.
So, I would assume it could be the t-stat or the wiring to the t-stat is shorted together. that is where I would start. I do not know the answers to the other questions you posted.
But...you keep power going to the unit when it is off for the season? I used to remove my battery and unplug it when I would not be around for a while. If you have power there and a mouse gets in, it could eat a wire, short it and you could have other problems (fire?) without you having any idea? I would cut all the power and remove the rv battery for the season, then this (or other things cannot happen.) When you go to it for the season, pre-charge the battery, install, and hook it up to power. The battery will last longer this way too.
Just my 2 cents. I hope I have helped. |