- Inspect overall condition
- Check blower wheel
- Check & adjust belts
- Check gas pressure
- Check burners for cleanliness
- Check thermocouple
- Check ignition controls
- Check venting/flue piping
- Check condensate drains
- Check pressure switches
- Check electronic controls
- Lubricate all moving parts
- Check cleanliness of air filter(s)
- Check all safety controls
