Stumped - Pump Won’t Prime

SplashDamage

Member
Jul 7, 2023
15
Northern CA
Hey everyone!

I’m new to the board, although I’ve definitely lurked here before for tips and troubleshooting issues I’ve had in the past. I’m hoping someone may be gracious enough to help me solve my problem - my former pool guy is too busy or can’t be bothered to swing by, so I’ve been trying to figure this out on my own - to no avail.

Let me get to it.

I have a 17,000 gal in ground pool with an attached, raised spa with a spillway. I recently had to change out my return actuator and that replacement went off without a hitch (I believe).

My previous actuator was set to stop at, let’s say 90% off on the spa return when it was in pool mode so that there would be a tiny bit of circulation and the spillway would run. When I replaced it, I couldn’t figure out how to get it to stop just short of totally closing off the spa return. My specific model is a Tork TPE24VA, and it wasn't clear to me how to manually set the dial. As a work-around, I manually hit the switch to off once it got to that desired 90%, knowing that it would no longer be controlled by the automation system. This was a temporary work around as I had no immediate plans to run it in spa mode while I did more digging on how to manually set the limit on the rotation.

I assumed that my drain actuator would also stay on the pool setting unless I switched it to spa mode. Then I went to bed. This morning, when I went into my backyard, I first noticed that the pump sounded louder than usual, like when it’s straining when the basket is full. However, as I got closer, I realized the spa was completely drained. I immediately hit the breakers to turn the pump off.

I then filled the hot tub back up with my hose, set the actuators to just run the pool water, then turned the pump back on. It “runs,” but the pump won’t fill with water. It does not return any water to the pool, in fact, a few air bubbles slowly come out of the nearest return jet. When I open up the pump, the water inside sits at like 2/3 full.

Some troubleshooting that I’ve done so far:

-Pool/skimmer water levels are good.
-Skimmer and pump basket are not clogged.
-I used a coat hanger to clear out the pump impeller and nothing came out.
-I’ve tried filling the pump with my hose and literally had it filling for ~10 minutes and it just kept eating it - it never filled/overflowed.
-I tried bleeding the air out of the filter, and when it eventually filled up, pressure wouldn’t build, and it would fill with air again. The filter is at 0 psi.

I’m hoping with these details and the troubleshooting I’ve done so far, one of you may be wise enough to pinpoint the issue. I fear that it pulling air in from an empty spa for who knows how long could mean the pump needs to replaced.

So, anybody have a clue what the issue is? Or have any other troubleshooting tips?

Thank you all so so much for taking the time to read this! Apologies for the length!
 
Welcome to TFP.

What model pump are we discussing?

Show us pics of your equipment pad.

My guess is your pump running dry overheated the pump and deformed the impeller or shroud. You will need to disassemble the pump and examine it.
 
Please post pics directly to the forum.
 
-I tried bleeding the air out of the filter, and when it eventually filled up, pressure wouldn’t build, and it would fill with air again. The filter is at 0 psi.

You say the filter eventually filled up.

Does that mean the pump is moving some water through the filter and lines?
 
Yeah, it took some time once I opened the release but it eventually filled up to where it was spitting water out. But not as much/far as it normally does when I do a filter cleaning with fresh DE.

That shows the pump moves water.

I think you have something deformed with the impeller that is effecting its ability to move water.

The pump needs to be opened up and examined.
 
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Ok opened it up and got the impeller out. Obviously have never done this, nor do I know what a “normal” impeller looks like, but nothing jumps out as abnormal - thoughts?
 

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What you show looks ok. Look into the side of the impeller which is where the water flows through.

How does the diffuser assembly look and the fit around the impeller.

While you have the pump open you should replace the pump seals.

 
Hey everyone!

I’m new to the board, although I’ve definitely lurked here before for tips and troubleshooting issues I’ve had in the past. I’m hoping someone may be gracious enough to help me solve my problem - my former pool guy is too busy or can’t be bothered to swing by, so I’ve been trying to figure this out on my own - to no avail.

Let me get to it.

I have a 17,000 gal in ground pool with an attached, raised spa with a spillway. I recently had to change out my return actuator and that replacement went off without a hitch (I believe).

My previous actuator was set to stop at, let’s say 90% off on the spa return when it was in pool mode so that there would be a tiny bit of circulation and the spillway would run. When I replaced it, I couldn’t figure out how to get it to stop just short of totally closing off the spa return. My specific model is a Tork TPE24VA, and it wasn't clear to me how to manually set the dial. As a work-around, I manually hit the switch to off once it got to that desired 90%, knowing that it would no longer be controlled by the automation system. This was a temporary work around as I had no immediate plans to run it in spa mode while I did more digging on how to manually set the limit on the rotation.

I assumed that my drain actuator would also stay on the pool setting unless I switched it to spa mode. Then I went to bed. This morning, when I went into my backyard, I first noticed that the pump sounded louder than usual, like when it’s straining when the basket is full. However, as I got closer, I realized the spa was completely drained. I immediately hit the breakers to turn the pump off.

I then filled the hot tub back up with my hose, set the actuators to just run the pool water, then turned the pump back on. It “runs,” but the pump won’t fill with water. It does not return any water to the pool, in fact, a few air bubbles slowly come out of the nearest return jet. When I open up the pump, the water inside sits at like 2/3 full.

Some troubleshooting that I’ve done so far:

-Pool/skimmer water levels are good.
-Skimmer and pump basket are not clogged.
-I used a coat hanger to clear out the pump impeller and nothing came out.
-I’ve tried filling the pump with my hose and literally had it filling for ~10 minutes and it just kept eating it - it never filled/overflowed.
-I tried bleeding the air out of the filter, and when it eventually filled up, pressure wouldn’t build, and it would fill with air again. The filter is at 0 psi.

I’m hoping with these details and the troubleshooting I’ve done so far, one of you may be wise enough to pinpoint the issue. I fear that it pulling air in from an empty spa for who knows how long could mean the pump needs to replaced.

So, anybody have a clue what the issue is? Or have any other troubleshooting tips?

Thank you all so so much for taking the time to read this! Apologies for the length!
Fill the pot with water, it will only fill to the height of the inlet plumbing. With the lid off, turn the pump on. Does the water "disappear" almost instantly. If not the impeller may have come loose from the motor shaft. If so, you need to look elsewhere for the issue, like the inlet plumbing. The pump ran dry overnight. The heat from that can damage the PVC.

Also, be sure to replace the shaft seal, PS1000, on any pump that runs dry that long.

The impeller doesn't look damaged, but it would be better if the ceramic was taken out for a better look. DO NOT forget to re-install the impeller screw. As the pump ran dry, a bit of silicone sealant placed in the hole where that reverse-thread screw goes will help it to seal. The rubber "cup" that is in the impeller now, or should be, has likely gotten hard from the heat of a run-dry condition, and may not seal correctly by itself.
 
Fill the pot with water, it will only fill to the height of the inlet plumbing. With the lid off, turn the pump on. Does the water "disappear" almost instantly. If not the impeller may have come loose from the motor shaft. If so, you need to look elsewhere for the issue, like the inlet plumbing. The pump ran dry overnight. The heat from that can damage the PVC.

Also, be sure to replace the shaft seal, PS1000, on any pump that runs dry that long.

The impeller doesn't look damaged, but it would be better if the ceramic was taken out for a better look. DO NOT forget to re-install the impeller screw. As the pump ran dry, a bit of silicone sealant placed in the hole where that reverse-thread screw goes will help it to seal. The rubber "cup" that is in the impeller now, or should be, has likely gotten hard from the heat of a run-dry condition, and may not seal correctly by itself.
Yeah I did fill it with water and ran it with the lid off - it sucked the water into the pump instantly. I did notice some light leaking along the plumbing but couldn’t easily tell exactly where it was coming from. Looked like from assembly around the actuator for the drain/intake.
 
Yeah I did fill it with water and ran it with the lid off - it sucked the water into the pump instantly. I did notice some light leaking along the plumbing but couldn’t easily tell exactly where it was coming from. Looked like from assembly around the actuator for the drain/intake.
Look at where the PVC pipe enters the pump pot, A lot of times that PVC pipe is a male fitting that will melt when a pump over heats due to running dry. It would become lose and suck air and not prime
 
Yeah I did fill it with water and ran it with the lid off - it sucked the water into the pump instantly. I did notice some light leaking along the plumbing but couldn’t easily tell exactly where it was coming from. Looked like from assembly around the actuator for the drain/intake.
If you are talking about the suction valve, then yes, that could also be a source of the no-prime problem. The actuator is mounted to the top of the valve. There are 2 stem and 1 lid O rings that may need replacing.
 

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