Came out to call for a system not heating properly. Tenant stated that the system wasn’t heating properly and they had another issue recently regarding the heat pump, but got that resolved, and was also informed about running the auxiliary heat during the freezing temperatures. Tenant said that the auxiliary heat worked for a few days, but now it’s not working at all. I checked the system over to find out what’s causing the system to not heat properly. I found the unit on a lockout, had to reset it. On initial inspection I found the filters dirty, gas pressure was a little high and flame sensor dirty as well. Pulled the filters in home, adjusted the gas pressure on furnace to recommended level from manufacturer specifications, and cleaned the flame sensor. The blower assembly could use some cleaning, but the evaporator coil is clean. Cleaned out system of dust, debris, and some mouse droppings, and tested system multiple times to verify proper operation. Unit is now heating properly. R