Hi my ac unit in my house has 2 zones. 2nd floor has good air flow, 1rst floor suddenly has low, low air flow. It seems like the zonefirst motor spring retun valve does not open.
Tried making adjustments with long screw, but still low air flow.
Any suggestions, help please

hi my ac unit in my house has 2 zones. 2nd floor has good air flow, 1rst floor suddenly has low, low air flow. It seems like the zonefirst motor spring retun valve does not open.
tried making adjustments with long screw, but still low air flow.
any suggestions, help please

Sounds like you are having zone problems. You will have to track down the circuit and see why the 1st floor is not opening. Probably a bad zone motor or another electrical problem.