- Check and adjust thermostat
- Clean and adjust all safety controls
- Clean burners and controls
- Clean and adjust pilot assembly (check standing pilot and electronic spark ignition controls)
- Adjust burner for efficiency
- Lubricate all moving parts
- Check belt and adjust tension
- Check filter
- Check vent pipe and draft diverter
- Check fan control
- Check manifold pressure
- Check furnace for cracked heat exchanger (visual)
- Check temperature rise
- Check complete furnace cycle
- Carbon monoxide safety check
- Check air and gas diaphragms
- Check blower wheel
- Check combustion air blower