Furrion thermostat in our Transcend 231RK had "Lo" error middle of the night (35 degrees outside!) Heater fan kicks on and when the gas ignites it turns off and "Lo" error appears. Battery voltage read 12.53v (and dropping due to the fridge, etc.) Hooked up to the truck and it runs fine. What is the minimum voltage requirement for the heater? Fridge is running fine and specs say it will run down to 10.4v, but can't find minimum for the heater. Seems like it should run down to low 11v. Brand new battery too. Got the battery up to 12.9v and the heater ran fine for the 1st cycle, then repeated the shutdown/error upon 2nd cycle.