Upon arrival , inspected system and found code e 09 and code e 04 on furnace. E 09 relates to pressure switch problems or inducer limit issues, Found pressure switch drain line was not trimmed.Properly per install, Trim Both inducer vents for both units. Test run system and adjust blower speeds on the second floor system to get adequate airflow upstairs as well as an adequate delta t out of the furnace. Upstairs system may need a new limit switch due to over tripping and damaging sensor. Unit is satisfying to temperature , not giving me anymore issues at this time.