Upon arrival I was told that both systems weren’t working properly. Kitchen unit was overheating per last technician. Found gas pressure way too high, 12.7inches w.c, regulated high stage down to 10inches w.c but couldn’t set low stage because set screw that holds spring in place on gas valve is stuck closed, cannot remove counterclockwise to set lower pressure. Gas valve needs to be replaced and we need to bring another LP kit just in case. Customer then explained that attic furnace was worked on before and now unit won’t heat unless door is off. Called office and didn’t get verification if we worked on unit. Found furnace will only run when intake door is off. Once door is mounted the flame goes out because of poor combustion airflow. Opened up panels to find crack in heat exchanger and rust seam all along the tubes. Spoke to customer about repairing or replacing system and they would like quote to replace.