Thanks to both of you for the response and the welcome
I’ve had the camper 4 weeks been out in it 4 times. 1st time
out AC was bad it had to be replaced. 2nd time out the thermostat was almost unresponsive it was replaced as well as the skylight and bezel( that’s another story). 3rd time out The furnace worked but I had to turn it up way higher than I would have thought as in 74° to make it comfy for hot natured me, I thought that’s okay new camper new norm. On this trip I traveled up on Tuesday, set up and the furnace worked perfectly. On Wednesday when I got back to the camper it was stuffy so I turned on the AC and all was well. Then about dark it cooled off so I changed the thermostat to heat. The AC had not been on in an hour or so, I set back and watched some TV and didn’t think about the furnace until the back of my neck started getting cold. Then I began to investigate. That ended in the sequence where I located the switch on the furnace box. ( it was in the ON position then I turned it OFF and then back ON again, then re-set the thermostat and Walla.