Hello, I would love to help you with any Honda or automotive questions.
Welcome, to Just answer, have you tried to un plug it and plug it back in?
This is a common problem with the air mix motor its self, the internal motor is weak and not able to adjust its self to the position that it sees fit. Like yours a bad motor gets the signal to slightly adjust the blend door and the weak motor is not able to do a slight adjustment so the heater control pannel sends more voltage to move the amr more
the larger voltage makes the mix motor overshoot its target position so it sends the arm the other way...Long story short there is no real fix but to replace the mix motor.
do you have any more questions for me today?