The Capacitor Start Pool Motor is one of the most common motors found on in-ground pool pumps. This style of motor has a supplemental circuit consisting of a start windings and capacitor to increase the starting torque by 150-175% while decreasing the starting current. When the motor reaches 2/3 to 3/4 of full speed, a start switch will take the start windings and capacitor out of the running circuit. This guide identifies the major parts of this start circuit and explains how it operates. For more information on which motors use capacitors and how a capacitor fails , see our guide on "How To Select the Right Capacitor For Your Pool Pump Motor".
frank Posted: 1/22/2022
On the hayward tristar pump. (this pump has a start and run capacitor) Do both the wires that come out of the back of the motor go to the start capacitor? Then a jumper wire goes to the weighted switch? One wire is orange the other is red. But there are only two wires.Reply
InyoPools Product Specialist Matt S. Posted: 1/24/2022
What is the part, model, or catalog number on the motor's label?Reply
menno Posted: 9/9/2021
Hello, i have here a pentair pinnacle 100, 220v, single phase of which the (run)capacitor has melted. On the engine it says EM06 045 1625. Which capacitor do i need? Best regardsReply
InyoPools Product Specialist Matt S. Posted: 9/9/2021
The number EM06 045 1625 is not searchable. Do you see anything on the motor label that resembles any of the following formats?7-177475-20C48K2N103B1B854UST1102EUSQ1152Reply
InyoPools Product Specialist Dennis R. Posted: 1/12/2015
roundbob - Not all motors have capacitors. Some pool motors like many above ground and spa motors are designed without a capacitor.Reply
roundbob Posted: 1/10/2015
I purchased a new motor from inyopools. It did not come with a capacitor. is that something I need to purchase separately?Reply
InyoPools Product Specialist Dennis R. Posted: 8/19/2014
Snapperhead - If your pump's motor has a capacitor under the back cover, that's a good place to start. If the capacitor is bad, the motor won't have enough torque to turn over. Also check the governor to make sure it doesn’t stick open when the pump is off.Reply
Snapperhead Posted: 8/19/2014
I have a 1.5 hp pump for an above ground pool. It doesn't start on it's own, I have to take the back cover off and spin the slot to get it started but then it is fine. Does that sound like a start capacitor? Someone else said a good cleaning inside could fix it.Reply
InyoPools Product Specialist Dennis R. Posted: 8/5/2013
Mr.C - Sounds like you have a bad capacitor. At least that's a good place to start. Here is a link to our capacitors.Reply
Mr.C Posted: 8/4/2013
Your explanations are great! Thank you!Q. My pump just hums on startup. If I give it a spin manually it starts right up and runs great. By your explanations above can I assume its my capacitor? Do you sell those?
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