[SOLVED] Duct test, but the duct knob is inoperable

[grizzly_air]

Part of the cabin checks is to turn the duct Monitor to test and Look for a response, and I’ve seen Toto do this test on the YouTube stream, but in my plane that knob is inoperable.  

Edited January 9, 2022 by Pils

[dirmer3]

You have to click on the words next to the know and not try to turn the nob itself.