✅ Inspect the heat exchanger for cracks, rust, or damage
✅ Check gas lines and connections for leaks
✅ Inspect the venting and flue system
✅ Test all safety controls
✅ Examine electrical connections and wiring
✅ Clean or replace air filter
✅ Clean the blower motor and fan blades
✅ Clean and inspect the furnace burners
✅ Inspect and clean the ignition system or pilot light
✅ Check and flush the condensate drain
✅ Lubricate all moving parts
✅ Calibrate the thermostat
✅ Adjust the gas pressure for optimal fuel delivery
✅ Test run capacitors