Question about AO Smith 1 1/2 HP 115/230V 56C Replacement Motor

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My sprinkler pump ''humms'' but won't engage; other then a stuck impeller could it be a bad capacitor?

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Yes its part of your starting ciruit no way to turn by hand?.

Posted on Apr 16, 2009

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Replace the capacitor.

Posted on Sep 20, 2009

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Pump turns, hums, but won't turn over.

Posted on Jul 12, 2009

  • mila lopez Jul 12, 2009

    Is it frozen? Can it be repaired?

  • mila lopez Jul 12, 2009

    So, is it frozan? Can it be repaired?


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2 Answers

Motor Hums but does not start

probably has a starting capacitor and it needs replaced

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My pool pump humms and then trips circuit. I took it apart a bit to check capacitor and impeller. I was able to unscrew the impeller off without holding onto the shaft. I'm assuming the shaft is stuck...

If the motor just hums and does not turn on then it sounds like the motor needs to be checked out.
You can usually get a few more years out of a motor by having a motor shop rebuild it if they can.

US Parts Center

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Motor just hums when turned on. I am assuming that a starting capacitor needs replacement. There is a capacitor on top of the motor. Should I also expect to find one under the wiring cover on the end of...

Probably. Consider also there may be a problem with your impeller ... the motor will humm (because it is running) but it will not pump anything because the impeller may have the center spun out of it.

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Model SP15921TLNP 1HP pool pump. Only had 1 year. We have had local quick on off power outages in this area. Now Pump does nothing. Using tester have power into the motor. I think may be capacitor but I...

Capacitor should be inside cylindrical cover on motor's side; simplest test is to replace it. If motor humms but won't turn maybe bad capacitor, stuck bearing (turn by hand) or bad/dirty centrifugal switch contact. If no humm at all, may have burnt internal neutral wire.

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Toilet will not work. when plugged it it hums even if i dont push the button,

When the unit is humming it could be something stuck on the blade or impeller preventing it from spinning. The drain pipe can be clogged or the capacitor which drives the blade and impeller may have gone bad. Tipically when the capacitor goes bad it will just hum and not pump the waste out.

Aug 21, 2010 | Saniflo & Saniplus& Macerator Pump

3 Answers

It just humms nothing clogged on blades, whats up?

Typically the pump will hum is something is stuck on the blade, impeller or if there is a clog on the drain pipe that is not allowing the waste to be pumped out. The capacitor/condenser drives the blade and impeller, if the capacitor has gone bad it will make the unit hum and not pump the waste out. If there are no obstructions then most likely the capacitor will need to be replaced.

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My pump just humms willnot pump water

Im talking about general troubleshooting here. Usually with this size of motor 1Hp. Check if it have a capacitor, commonly if this humms the capacitor is faulty. It is a capacitor start motor. Another fault could be stuck up. Or one of the winding has a short. Hope it helps

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Flotec Sprinkler Pump not priming

it might be that the pump is prewired at 230 volt and you are running a 115 power supply to it, if motor just humms and little water comes out this might be your fix

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