If you're still waiting for an answer, it's either the internal manifold, or gearbox - most likely the "manifold" inside the cleaner has stuck & will need to be replaced. It's not really a serviceable part.
I had the same problem last year with my Phantom cleaner. It was the manifold .It costs about $95 , but I felt that it should not have broken after 2 years of light use (pool season in NJ is 3 months max)so I typed a nice email to hayward customer service stating how I felt and within a day I had a reply asking for my address as they were going to send me out the part for free.took me about 20 minutes to install it .Works great !
Hayward Phantom Turbo Cleaner Malfunctioning
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I had the same problem last year with my Phantom cleaner. It was the manifold .It costs about $95 , but I felt that it should not have broken after 2 years of light use (pool season in NJ is 3 months max)so I typed a nice email to hayward customer service stating how I felt and within a day I had a reply asking for my address as they were going to send me out the part for free.took me about 20 minutes to install it .Works great !