Question about AO Smith 2 Hp Spl 3450rpm M56 Frame 115/230 Volts Replacement Air Compressor Motor Electric Motor No.B381

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High speed spa pump shuts off

Newly installed 2-speed spa motor shuts off after about a second after being switched to high speed. Does not trip breaker so apparently inside the motor. Low speed works ok.

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  • miedha2004 Feb 01, 2009

    Where would I find the Selector Switch Contact? Is it in back of the motor where other electrical contacts are located or on top of the motor inside the switch cover? Thanks for the help.

  • miedha2004 Feb 01, 2009

    I was able to isolate and fix the problem. On top of the motor is a capacitor. Upon removing the cover I observed one of the contacts on the capacitor was bent over very close to the other. When the pump was switched to high speed arcing would occur between the two shutting off the motor. A factory QC failure.



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Pump speed Selector Switch Contact Probably Missing, Checkout

Posted on Feb 01, 2009

  • Rizwan Noori Feb 01, 2009

    Can you provide me exact Specification of the pum


  • Rizwan Noori Feb 02, 2009

    As i Gave you Solution Yesterday isntead of you make any thing on it better call dealer for Service man Coz the pump comes under Warranty Periode.




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Thank you for posting your question here on

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If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


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1 Answer

High speed spa pump shuts off

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.


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