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Is there a separate start and run capacitor on be flo-master xp2?

I replaced the capacitor on the top of the motor but am still having the problem of it not starting. It looks like there may be another capacitor on the end but will have to remove e motor to get to it

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Depending on which motor is on your XP2, the bigger capacitor on the side is the run capacitor not the start capacitor.
Typically there is a plastic shroud on the rear of the motor, inside you should find the start capacitor. It is smaller that you might expect usually around - 7/16" x 2-3/4"
Note the part number and the MFD range rating.

Posted on Nov 01, 2012


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SOURCE: What do i replace my 4hp Flo Master XP2 wet end

Thank you for posting your question here on

Your wet end was most likely the 3HP version all along. Most pump manufacturers use the motor service factor to exaggerate the HP rating to try and sell the unit as 'better' than the competitors. You are best off using the part number molded into the original impeller as a means of identifying what pump you really have and ordering the wet end based on that information. If you can get the 8 digit number please post it in a comment to this message and we can verify the correct wet end for you. Another alternative will be to use a Waterway Executive model wet end if yours is indeed a discontinued 4HP rating.

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!


Posted on Aug 18, 2010

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You will need to remove the six bolts/nuts on the wet end to expose the impeller. At the rear of the motor, remove the cap covering the shaft and restrain the shaft and spin the impeller off (counter-clockwise). Check to see if there is a screw in the center of the impeller and remove it by turning clockwise (if applicable). Once the impeller is off, you can remove the four through bolts from the rear of the motor using a 5/16 nut driver and the wet end should come right off.

Posted on Oct 22, 2009

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1 Answer

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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My Flowmaster XP2 will start and then immediately shuts off. Any suggestions on how this might be repaired?

If it hums and quickly shuts off but doesn't turn then it is often caused by a bad capacitor. It might also be caused by something stopping it from turning. If it turns and then shuts off then there could be shorted windings in the motor or too much friction in the motor or pump. I hope this helps.

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I have an aqua flow master 3.8 hp xp2 pump in my hot tub, it sounds like it is receiving power as it is clicking on but it will not start. have i fried the motor? the shaft turns ok but nothing is...

Many of these pump motors have a capacitor and start & run windings. I had a pump motor a week ago that was free to rotate, but only hummed. I looked inside the back end, everything looked good, I bought a capacitor online for $7 + $15 shipping, installed it and it worked. The capacitor will have voltage & rating on the side.
BE CAREFUL, CAPACITORS KEEP VOLTAGE EVEN WHEN NOT PLUGGED IN. If you don't know how to handle them, take the motor to a local motor repair shop.

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I have a burnt out capacitor can i just replace it or do i have to replace motor.

You can start by replacing the capacitor. This should solve the problem, but if it doesn't, you will need to consider having the motor rebuilt or replaced.
Generally a capacitor should run you anywhere from $2 - 30 depending on where you get it from.

Dec 30, 2010 | Aqua Flo Aquaflo Flo Master Xp2 Spa Pump...

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I need to replace the capacitor for a flowmaster xp2e 230v model 05825001-2. old one says 35UF +/- 6% 370VAC. is this a run capacitor? i have found replacement capacitors online that say (35) 370VAC, is...

Yes, that is a run capacitor. You will also need to clarify oval or round design.

You should take the old one in to a local electric motor repair shop if it is not obvious it is blown. Even if it is, their will be other issues that caused the capacitor to fail in the first place. You will want to try to identify those and fix them as well or you will be replacing the capacitor again soon.


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My primary circulating motor hums when being switched on.If the shaft is manually turned clockwise motor starts and runs.I checked both capacitors and they're good.Any ideas?

The starting switch that controls the capacitors is likely the problem. If the arms are bent you can bend them back to the point they work properly. If they are damaged beyond repair you can replace the stationary start switch. If you are not familiar with these repairs you can contact a local electric motor repair shop and they should be able to help you.


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When I turn on the jets at the first setting it brrrr's but does not start. The second setting works fine and when the second cycle is finished the first continues fine. It is just when it first started...

Sounds like you may have a bad start capacitor that is not kicking the motor when it's set to run the low speed. If it just humms, it's usually a capacitor. It can also be the bearings but if it runs quietly normally, then it's probably a start capacitor. Hope this helps.

Nov 01, 2009 | Aqua Flo Aquaflo Flo Master Xp2 Spa Pump...

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Hot tub pump will not run. Pump makes a click noise and hums but will not run, could this be a start capacitor gone bad

This can be one of three issues.
1.  Starting capacitor as you have suggested.  You can take the capacitor to a motor shop and have it tested or test it yourself if you have a meter that will check capacitance. 2.  Low/High voltage.  If the voltage is not at the proper levels (10% up or down) then the unit may have a hard time starting. 3.  Something might be binding up the impeller.  Disconnect the power and carefully check to see if the shaft of the motor spins freely. 4.  A short in the windings.  If none of these seem to be the problem, then you will probably need to replace the motor.

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