Furnace flames cycles off before temp is reached

Thanks all. The furnace is an Atwood. I’m touring bourbon distilleries in Kentucky today so I’ll have to get the model tonight. We should be out of the freezing overnight temperatures for the rest of the trip so hopefully we’ll get by with the heat pumps. I’ll pull things apart and check for obstructions when we get home. I always count on this forum for good advice and direction.