- Check evaporator coil
- Lubricate fan motor
- Verify expansion valve operation
- Clean evaporator drain
- Check start and run delays
- Clean blower wheel
- Adjust bypass dampers
- Monitor refrigerant level
- Inspect valves
- Check and clean drain pans
- Clean or replace filters
- Adjust operating pressures
- Verify proper air handler operation
- Tighten electrical connections
- Evaluate safety controls
- Measure amperage draw
- Measure temperature difference
- Clean heat exchanger
- Clean condenser coil
- Evaluate vent system
- Replace bad belts
- Adjust thermostat calibration
- Check fan blades for tightness