- Check evaporator coil
- Lubricate fan motor
- Set manifold pressure
- Monitor expansion valve
- Check start and run capacitors
- Test fan limit switch
- Clean evaporator drain
- Check start and run delays
- Adjust bypass dampers
- Monitor refrigerant level
- Inspect valves
- Clean or replace filters
- Adjust operating pressures
- Check flue
- Tighten electrical connections
- Measure voltage differences
- Check flame baffle
- Evaluate safety controls
- Measure amperage draw
- Measure temperature difference
- Clean and adjust burners
- Clean heat exchanger
- Clean condenser coil
- Evaluate vent system
- Test thermocouple
- Adjust thermostat calibration
- Set burner adjustment
- Check combustion air
- Check fan blades for tightness
- Measure gas input