Strang issue with Wind pin voltage

I’m having an issue hooking up air assist to my Ruida 6445G controller.
The voltage across the wind pin and the +24 pin is 23.75V when the machine is idle. when a job runs it drops to 21V. neither voltage is enough to trigger the solenoid.

my understanding is that Idle voltage should be 0V and when a job runs with Air assist enabled it should go to ~24V.

I have enabled the blower in the vendor settings of the controller.

Researching the forum It seems to be the exact issue this user was having, although it’s never clear if it was resolved: "Wind" pin weird voltage issue rdc6442s

does anyone have any ideas what might be going on?

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