Performed zoning diagnostic, carrier split zoned system attic. Tested zoning. First tested downstairs tstat on, and tested to see if zoning was working. Next turned on upstairs heating. Zone damper opened up. Next tested system by turning off downstairs. So just upstairs is running. Zoning is working as it is suppose to be working at this time. See pictures. System does have some blow by, airflow making its way thru system even if zone is shut, that’s normal. Also found upstairs tstat fan mode set to circulate. Switched it to auto, to stop it from turning on upstairs on its own a few times an hr. Hvac diagnostic