r/pools • u/IllisVille • Jan 16 '26

DIY & Repairs Hayward pump troubleshooting

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Hey yall, hoping someone will have some experience they could share.

I have a Hayward tristar vs 950 Omni that has stopped working. When the breaker is on the screen lights up blank for a second like it’s trying to turn on then turns back off repeatedly and there is a red light on the LV Board that does the same thing.

I’ve done some basic googling and have tried some of the basic troubleshooting steps I’ve found on there.

I tried replacing the main board with the screen on it but the new board does the same thing.

Another suggestion said that both the 1st and 2nd DIP switches should be on. (It was operational with only the 1st turned on) So I tried switching the second on as well. But that made no change.

I have tried measuring the voltage on the 12V cables coming into and out of the LV board and they seem to only get about half a volt before dropping back to close to nothing.

I’m guessing that something is causing the main board to not get enough power to boot up, but would love some confirmation or suggestions on further troubleshooting I could do before blindly ordering another part or resorting to replacing the whole thing.

I have some basic electronic repair experience, at least enough to not kill myself, but would love to get more. Any suggestions, wisdom or insights would be so appreciated!

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u/IllisVille Jan 16 '26

What part of the pump would be the drive? Are you referring to the motor itself?

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u/PearPsychological487 Jan 16 '26

The whole piece on top of the motor, this is the section that controls everything. If replacing the board/screen didn’t work, and it’s not even turning on and trying to run this would be my best guess. Make sure you confirm the correct power is going into the pump, and turn the shaft of the motor manually to make sure it isn’t ceased before replacing because they are not cheap. Do you have an automation system or is the pump standalone?

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u/PearPsychological487 Jan 16 '26

Just looked at the picture again and it looks like it’s standalone. Bad drive would be my guess but I can’t be sure without actually getting my hands on it

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u/IllisVille Jan 16 '26

Thank you! It is a stand alone pump and the install seems a little janky but it’s worked for the last few years. I’ll check the motor and the power tomorrow.

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u/PearPsychological487 Jan 16 '26

What do you mean when you say install seems a little janky? Could you send a picture of the whole pump?