Tested system not heating for the whole home. Found that the control board is receiving power, but is not responding in anyway. This control board has failed and would need to be replaced in order for us to test any other components any further. While we were in the crawlspace, we noticed that the filter was very dirty along with all of the ductwork and we recommend replacing the filter along with cleaning the ducts. There is also signs of water issues and this system is lacking flood protections along with a secondary drain pan to catch any water. The tenant will be going through the company that owns the home.