1 system PM 2nd visit- Checked heating operations of 2018 90% Rheem furnace. Replaced 16x25x1 filter, Checked capacitor outputs and amp drawls, Inspected heat exchangers, Checked delta T, triggered safety switches, Cleaned flame sensor, Brushed burners, and cleared drain line. Furnace not working because of a shorted control board (not sensing flames). Pics uploaded Will be sending quotes to replace control board(labor only), To patch up a flex duct that was damaged by rodents, and add a carbon monoxide detector in home Customer not answering phone calls