2 speed pump stopped working at high speed (low works fine)

[citznfish]

Video of the issue

Pump is a few years old. This morning it decided to stop running on high but works fine on low. I think it ran on high correctly for a bit when it started this morning because I heard the spillover this morning. If I try to switch from low to high it attempts to start but then fails, waits a few seconds, and tries again.

I changed the start capacitor thinking that was the issue but that didn't work.

Relays seem to be fine since the pump itself tries to switch.

Could this be a short in the windings?

I also read that it could be the cartridge filters are clogged but I would think the pump would at least try to run on high for a minute then overheat if that was the case. Also the pressure gauge on the filter seems to be within proper range. So probably not this, right?

Coincidentally at the same time I can no longer log in to my Hayward OmniLogic app, but I can control everything from the OmniLogic unit itself. I think this has to be a coincidence

 

[mas985]

Pump model#?

Certain models of 2-speed pumps have two capacitors. One in the hump and one in the back end.

 

[JamesW]

It looks like a Hayward Tristar, which is usually a capacitor start capacitor run motor.

Motor type CXCP has a start capacitor and a run capacitor for the low speed and a run capacitor for the high speed (permanent split capacitor (PSC)).

The top run capacitor is usually a dual capacitor.

High is a PSC motor and low is capacitor start capacitor run.

Most likely the top run capacitor is bad.

Three capacitors on one pump motor?

Century 2HP 2-speed motor CAT B2984 230VAC. The capacitor under the top cover is 35+10 uF (it has three terminals). I believe that is the run capacitor. The capacitor under the end cover is 189-227 uF (it has two terminals). I believe that is the start capacitor. I learned that the 35+10...

www.troublefreepool.com

Pump won't startup in low speed, even after replacing capacitor

Hey folks, I bought this pump (link) 2 years ago and have been running it in low speed. Recently, it started doing what's in this video on startup (hums for a few seconds and then nothing): I replaced the capacitor, but it's still doing the same thing. Works fine in high speed mode. The...

www.troublefreepool.com

 

[JamesW]

Your pump lid is on backwards.

You can see where it says "Front" (Red arrow).

 

[citznfish]

Pump model#?

Certain models of 2-speed pumps have two capacitors. One in the hump and one in the back end.

Here is the info on the pump. I believe it is a tristar. Top capacitor has 2 leads. I'll take the back cover off but I'm betting there is a cap in there like everyone is saying and I'll replace it and see what happens.

 

[citznfish]

Your pump lid is on backwards.

You can see where it says "Front" (Red arrow).


View attachment 541241

View attachment 541242

Didn't seem to be an issue but I'll change it when I get back to working on it, thanks for letting me know

 

[JamesW]

Did you replace the top capacitor or the back capacitor?

 

[citznfish]

Did you replace the top capacitor or the back capacitor?

I replaced the one on top, in the hump.

 

[JamesW]

 

[JamesW]

What capacitor was it (model number)?

Can you show the wiring in the back?

 

[JamesW]

Century (A.O. Smith) 2.0 HP Full Rate Motor, Square Flange 48Y Frame, Dual Speed - Model SQS1202R - INYOPools.com

Century 2.0 HP Square Flange 48Y Dual Speed Full Rate Motor - SQS1202R

www.inyopools.com

 

[citznfish]

What capacitor was it (model number)?

Can you show the wiring in the back?

Sure, here are a few more pics with the top and back covers off as well as the box from the capacitor I replaced. (Old and new caps are the identical)

 

[citznfish]

 

[JamesW]

The top is a run capacitor and that goes to the high speed.

The back is a start capacitor, and that goes to low speed.

How are you switching speeds?

Maybe the switch is bad.

 

[citznfish]

The top is a run capacitor and that goes to the high speed.

The back is a start capacitor, and that goes to low speed.

How are you switching speeds?

Maybe the switch is bad.

I switch speeds via Hayward OmniLogic controller, so that would be via relay(I assume) in the OmniLogic controller box

 

[citznfish]

So my next steps will be to check voltages and test relays (I just need to find tutorials on these)

I also ordered another cap, a different brand, just to validate I didn't install a defective one with the first replacement)

 

[citznfish]

Update: windings were shot. Had to buy a variable speed pump to replace. CA won't let pool owners buy a 2 speed any more, must be variable speed. Awesome.

All good now.