Pentair variable speed pump making noise. Normally the pump is very quiet

rp7777

Well-known member
Oct 10, 2011
117
Plantation Fl
Pump is making noise. Something is definitely going on in the motor. Not sure how to troubleshoot. Kind of sounds like grinding. Also a couple of months ago my zodiac mx8 caused the pump to lose prime. I even bought a new zodiac mx8 and I got the exact same results so I know my 2nd issue of losing prime has nothing to do with the vacuum that gets connected to my skimmer.
Pump only worked fine without the vacuum connected.
Now I have the noise issue so wondering if somehow they are related.

I have attached photos. Pump is about 6 years old
 

Attachments

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,959
Northern NJ
Your pump motor shows a lot of corrosion on it. The noise is probably a bad bearing.

The control panel has a label with a date of 07/13/2017 on it. Has that motor or control panel been replaced before?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,959
Northern NJ
Can a bad bearing be replaced by me?
I don’t know what your abilities are. That corrosion indicates you may have a seal leak and more going on inside.



Check YouTube for videos on repairs.
 

rp7777

Well-known member
Oct 10, 2011
117
Plantation Fl
I should be able to replace the bearing based on a video I saw. My loss of suction/prime only happens when I have the valve open for the slimmer and the hose/vac connected. It does not lose prime when the vacuum is not connected or when the valve is open for the main drain at the bottom of the pool. I know I don’t have anything stuck on the pipe because I place large chunks of chlorine tabs in the skimmer and it travels directly to the pump basket
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,959
Northern NJ
My loss of suction/prime only happens when I have the valve open for the slimmer and the hose/vac connected. It does not lose prime when the vacuum is not connected or when the valve is open for the main drain at the bottom of the pool.
Post pics of your equipment pad, plumbing, and valves so we can see what you are dealing with.

Finding the right balance of valves to get a vacuum running seems to be an art in some pools. Best thing is to get a robot cleaner

I know I don’t have anything stuck on the pipe because I place large chunks of chlorine tabs in the skimmer and it travels directly to the pump basket
That is not good for your pump as tabs are very acidic and get acid water in your pump. You should be using a floater for tabs.
 

rp7777

Well-known member
Oct 10, 2011
117
Plantation Fl
Post pics of your equipment pad, plumbing, and valves so we can see what you are dealing with.

Finding the right balance of valves to get a vacuum running seems to be an art in some pools. Best thing is to get a robot cleaner



That is not good for your pump as tabs are very acidic and get acid water in your pump. You should be using a floater for tabs.
 

rp7777

Well-known member
Oct 10, 2011
117
Plantation Fl
I actually never use tabs. I just did this so in case there was something stuck in the pile the chlorine piece would eventually dissolve and not further clog the pipe any further.
I will send photos later but I have had this setup running successfully since 2014.
I personally installed the piping, pump, filter, solor panels and solar controller.
I always had the valve open 100% on the skimmer side with the vacuum connected

what is the benefit/cost of a robot cleaner?
 

rp7777

Well-known member
Oct 10, 2011
117
Plantation Fl
Corroding Pentair Variable speed pool pump. Anyone else have this issue? I saw an older post about this same topic but it as pretty old.
Im kind of upset because I purchased this $1000+ pump that has already had the controller changed, its corroding and also sound like the bearing are going bad.

This is the original post
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
18,321
Bedford, TX
rp,

We have seen a few IntelliFlo pumps with this issue.. Out of the thousands and thousands of these pump that were made, there are very few issues... The are regarded as the "gold standard" of pool pumps.. That does not mean there will not be issues, but they are the exception and not the rule..

Let's see some pics..

Thanks,

Jim R.
 

JamesW

TFP Expert
Mar 2, 2011
19,803
I would suspect a seal leak.

I think that the motor casing is aluminum or magnesium.

Either of those will corrode quickly under the right or wrong conditions.

Does a magnet stick anywhere on the motor casing?

Does a magnet stick where the corrosion is?

Is the pump bonded?
 

setsailsoon

Gold Supporter
LifeTime Supporter
TFP Guide
Oct 25, 2015
3,155
Stuart/FL
rp,

Definitely looks like a seal leak that has caused a bearing failure in the motor. This is a common failure mode for all pumps. That's a permanent magnet motor and could be a little harder to get apart than the video's you see. Also, be prepared that the long skinny bolts that hold the motor together may be frozen in the front flange. Use a lot of TLC getting them out or you risk breaking them off in the housing. If this happens it's not impossible to fix at all but this then requires you drill out the screw and re-tap or use a longer screw and put a nut on the other side of the flange. If you go this route put some anti-seize on the bolts before you install and they will come off easily next time. In the future, inspect your pump when you're at the equipment pad and look for drips of water. If you catch it early it's an easy seal replace instead of a motor bearing failure.

I hope this is helpful.

Chris