I installed the new Lopi Greenfield a couple weeks ago. We have been happy with it and running it on "smart" thermostat. I realized this morning it is not changing settings or at least I am not able to detect it is. When I put it into manual mode and cycle from low through high I don't see any change in flame size. This is all controlled by the remote wall thermostat. There are not manual knobs to adjust. I did a propane conversion and needed to install a stepper motor. See attached screenshot. Could this be the problem?? Local lumberyard where I purchased did not tell me I needed one so picked up a new one off of ebay. I appreciate any input.