Strange SWG Problem

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S

Seadweller

Well-known member
Aug 21, 2009
260
Tampa Bay Area
I have a CircuPool Universal 40 that's been outstanding. It's around 10 years old, however I replaced the control board and cell around 1 year ago. Out of the blue a few days ago, it threw a low salt warning. I checked the salt level in the pool, and it's well within spec (3600). I went ahead and pulled the cell, and noticed very little scaling, but I cleaned it anyway. I reinstalled it, and it worked fine until the next morning. When the system fired up, it threw another low salt warning.

Toggling through the menu, I noticed that the salt reading on the control unit that regularly updates the salt level was at 0000. When the system works, the control unit is reporting a salt level of 3,600, which matches my test result. If I turn the system off, then back on again, it will work fine for the entire day and seems to register an accurate salt reading. Fast forward to the next morning, and when it fires up, it throws another low salt warning. Any idea what might be causing the low salt warning at start-up, and why would it work fine the entire day after an off/on action?

Thanks!
 
I replaced the control board and cell around 1 year ago..
Click to expand...

Call DSP and make a warranty claim.

Is the SWG powered when your pump is off?

Check your flow switch that it turns the SWG off when there is no flow.
 
Last edited:
Is the SWG powered when your pump is off?

Check your flow switch that it turns the SWG off when there is no flow.
 
Thanks gang...I'll answer a few questions:

1. The SWG is on a timer, and turns on 1 hour after the pump starts, and several hours before the pump stops.
2. There's no possibility of it operating when the pump is off, given the timer.
3. I checked the flow switch, and with the pump off, and the SWG on, it does not turn off. Could the flow switch be the problem, even though the unit only runs when the pump is running?

Thanks!
 
Seadweller said:
There's no possibility of it operating when the pump is off, given the timer.
Click to expand...
The timers might be off correct time allowing operation during a no flow condition.

Replace the flow switch and ideally, make it face up, not down.

The cell can explode if it operates with no flow.

Test Boom GIF
 

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OK, I replaced the flow switch and all seems well. Oddly enough, the "Low Flow" light never came on, but I guess that wouldn't happen if it failed in the "on" position. The only thing that comes to mind is the flow switch must be interrelated with other sensors to cause a low salt warning. Thanks for the guidance!
 
Seadweller said:
OK, I replaced the flow switch and all seems well. Oddly enough, the "Low Flow" light never came on, but I guess that wouldn't happen if it failed in the "on" position.
Click to expand...

The flow switch opening is what turns the "low Flow" light on.
Seadweller said:
The only thing that comes to mind is the flow switch must be interrelated with other sensors to cause a low salt warning.
Click to expand...

With no water flowing the cell does not see any salt and throws the low salt warning. That is why the cell needs to be OFF when the pump is OFF.
 
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