The only thing I can think of is are you sure you blew all of the air out of the hose and cleaner? I also found that I was assembling the hoses up to the last ridge on the hose coupling as I didn't want to jam it all the way on but I notice air bubbles going through the skimmer when this happens. Next time I'm going to try pushing each coupling on all the way together to see if that helps.
If it's not that, try the Hayward help line in the troubleshooting section of the manual.
Peter
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