Issues with SWG. Hayward TCELL940

300winmag

Gold Supporter
Aug 2, 2016
220
Dallas, TX
Not sure if my cell has reached end of life, or if its having other issues. It is about 4 years old.

Taylor K-1766 says 4000 ppm salt (too much, i know. More was added based on reading of SWG).
SWG says 2300ppm.
FC in pool is dropping. Now 5.5ppm.

How do I know if I need a new cell, or if something else is going on?

Thanks
 

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What date was it installed?

You should have a 4 year warranty.

This is the basic information we need to know in diagnosing a problem:

Report all diagnostic readings when you..
Move the switch from auto to off and check all of the readings.
Move the switch back to auto and recheck the readings.
Move the switch to off for a minute and then back to auto and recheck the readings.
What are the first seven characters of the cell and box serial numbers?
What is the actual salinity and how are you measuring it?

Pressing the diagnostic button sequentially will display:

Default salt display
Pool temp
Cell Voltage - When not generating, the voltage is about 30 to 32 volts dc. When generating, the voltage drops about 1 volt per amp of current.
Cell current
Desired output (% of the knob)
Instant salinity
Product name
Software revision (r.XX)
Cell type

Instant salt = the cells reading of the current salt PPM
Average Salt = the average salt reading of the last 3 cycles of the cell.
To estimate the performance of the Aquarite cell, divide the instant salinity reading by the actual salinity. If the performance is less than 75%, the cell is failing and it's time to consider replacing the cell. You need to be sure about the actual salinity by using a salt test like the Taylor K-1766.

Check the instant salinity reading and then cycle power to reverse polarity and recheck the instant salinity reading. The numbers should be about the same +/- 200 ppm.

You can get the age of the cell from the serial number. It will be 3Exx, where xx is the year it was made.

 
Normally, the cell begins to perform at a lower and lower level rather than just fail completely.

It seems like either a bad cell or maybe a board issue.

You can pull the board and check for any signs of damage.

You can check for voltage at the pins when the cell is turned on.

1712594763334.png
 

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You divide the instant salinity reported by the Aquarite by the actual salinity. If 0.75 or lower, time for a new cell.
 
Move the switch from auto to off and check all of the readings.
Move the switch back to auto and recheck the readings.
Move the switch to off for a minute and then back to auto and recheck the readings.
 

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