Furnace starts out great & then later not?

Camp, Forrest, Camp! wrote:
I had a similar problem in my 1985 Lance. In my case, the furnace would come on and run one complete cycle with no problem. When it came on the next time the thermostat called for it, it wouldn't light and would blow cold air until morning. If I flipped the on/off switch to off, then back on, it would again work for one cycle, then go cold. In the end, my problem was the control board. The new one not only corrected the problem, but prevented the cold air thing.

Here's the explanation of what was going on:
- The root problem was a problem with the control board that it was preventing it from lighting the second time. Resetting it with the on/off switch reset the board.
- The old board did not have a "lockout" mode, so when it did not get confirmation of a light, it would blow air constantly as a safety precaution. This would ensure that the furnace did not overheat and start a fire. Since that furnace draws outside air, we woke up freezing with a broken toilet.
- The new board had the ability to shut everything down, so if it fails to light, it tries two more times, then calls it quits. Ten minutes later, it tries the trio again. After three total routines, it locks the system down until the on/off switch is reset. You may not have heat, but at least you don't have single-digit air getting pumped into your camper.

Where is this control board?

Or are u talking about the one on the wall with the remap settings?

I've been hearing from many that it's likely a voltage drop in the battery.

I was gonna go for 3 6 volt batteries next, but they won't fit in the Lance battery box.

So now this has me wanting to get a brand new biggest deep cell 12 volt I can for the camper hoping that fixes it.

But this control board sounds about right & being yours is also a1985 just like mine, could be a common issue?

Please tell me the the control board is super easy?