Question about Rule H53sp 24mgra Swimming Pool Cover Pump Centrifugal Computerized

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High speed spa pump shuts off

I just installed a new 2-speed 2hp A.O. Smith spa motor for an inground spa. The low speed works fine but is not strong enough to prime the system. When I switch to high speed the pump runs for 2 seconds then shuts down. Electrical circuit does not trip so it is wired correctly. Any ideas?

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  • Rod Kidman
    Rod Kidman May 11, 2010

    when you say 'prime the system' what do you mean?
    is the heater coming on when it calls for heat?
    Sounds as if something is not wired properly but hard to determine from what you have told us.

  • Anonymous Mar 13, 2014

    the spa is on a electrical / mechanical timer ... when removed and the spa plugged directly into power to run the electric pump will not run. All power has been checked ok ...

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The motor may have a thermal cutoff if the motor draws too much current. Do you have a sufficient large gauge circuit supplying the motore? If not the actual voltage at the motor may drop, causing it to draw more current to make up for the loss of voltage, thereby tripping the motor's protective breaker. I assume the motor will start again after serveral minutes of cooling down.

Curtis

Posted on Apr 19, 2009

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