Our cleaning system does not switch to a different zones while cleaning. I have opened the head of the unit and the gears turn by hand so I don't know what to look at fixing or replacing.
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Not switching zones means that the gears, while they turn by hand, aren't turning with the water flow like they should. I'm guessing you already did this, but I'd look for any broken plastic in the valve first. Can you post a picture of it open?
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