I have a Polaris pressure side cleaner, I'm no expert, but I can tell you that the reverse should kick in probably every 30 seconds or so but just for a few seconds. From what I understand when they go bad they either don't work at all or they stay running all the time so if it is cycling on and off it's probably OK. Mine was doing the same thing and it was the hose, it was weathered and brittle and the swivels did not work very well. I put on a new hose and it works perfect. Next time mine has any trouble at all I'm going to a robot without question. If you Google it, you can find a owners manual online, that's what I did.
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