- 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
 - Tighten electrical connections
 - Evaluate safety controls
 - Measure amperage draw
 - Measure temperature difference
 - Clean condenser coil
 - Evaluate vent system
 - Calibrate thermostat
 - Check fan blades for tightness