I have it set to 115 v and have checked the voltage going to the pump and it is correct. This is the second one doing it. I bought one yesterday that did it. I returned it today for a new one and it is doing it. Does the capacitor have to charge before the pump will run?
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The hum is the sound created by a motor when it cannot start either because the load is excessive and it cannot do the job or if the start capacitor is bogus.
If cap is good, motor should start immediately upon turn on. Measure cap with cap meter or simply replace it. The capacitance should be the amount indicated on the cap and not more than 10 percent less.
If capacitor is good the pump itself might be frozen. Try running the motor not connected to the pump.
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