Coleman Mach AC communications error help

I’ve got the same system in my Keystone Challenger.... don’t you wonder what they were smoking when that system was dreamed up?? I mean,what’s the advantage of a remote controller in a small living space that always has to have a line of sight connection to work?? Always having to worry whether it’s communicating properly and don’t even think of trying to find any replacement parts for that mess...there’s a good reason why that system was discontinued (as far as I know) a long time ago....
I would love to convert to a plain old wall thermostat in my rig, but I’ll wait till mine takes a dump...again...
When I had some issues with mine years back, I did get some good tech advice from RVP division of Coleman products. They were very helpful.