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I posted last year that my AC would occasionally flatline and the vent controller would default to floor (not part of the dreaded servo problem). The AC would come back and the vents would work again. The code suggested a pressostat problem, but i still don't understand why the vents would be affected.
It has not happened in a while and it may not be the same or similar to what you are experiencing, but since there are a number of AC related posts, I tought it may be a good opportunity to to toss this info into the current data base.
PS it has also happened with the AC off but fan running for fresh air..Strange
Good luck..
Dr. Chip
Westchester County, NY
98 V90
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