Air Sensor Calibration Failed with new VDD

I just installed a new VDD due to the old VDD not passing its air sensor calibration. Now the new VDD is also not passing the air sensor calibration. I have checked all connections and made sure that the Sample Manager is completely primed and with appropriate solvent. Is there a certain step that I am missing for the air sensor calibration. I have the appropriate code for the service mode to activate the calibration procedure. 
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