Upon arrival inspected furnace and found no major concerns unit was not throwing any error codes, after inspecting unit further discovered unit was due a cleaning, with a clogged drain trap and heavy deterioration on the flame sensor. Flushed drain tra and quoted then ordered replacement flame sensor. Furnace maintenance inspection performed Inspect filter: 20x25x4 no concerns Inspect burners: clean no concerns. Ohm ignitor: 48.6 Clean flame sensor - major pitting Inducer amps: 0.48 Blower Motor amps:4.28 All wiring ok no concerns Humidifier: panel ok, air open power on Temperature rise: 55° Furnace is running in condition.