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Are they getting normal operation out of the other one?
That damper is NOT switching over if it is just recirculating room air?
If its working properly then why would it have room temp air in that branch?
Right i think the motor on that damper is bad or the damper is stuck. its a small low voltage motor
Red is closed green is open. if i understand you correctly its closing on its own?
Somehow it is getting 24 volts to the close circuit when it shouldn't
That's a great idea. I'd try that in a sec if I were you