Welcome to TFP.

How old is the cell?

How many gallons in your pool?

What % do you typically run the cell at?
 
3 years at 60% is about the life I expect from the iChlor30.

Your cell is likely depleted and needs replacement.

Pentair has new higher quality IntelliChlor LT cells replacing the iChlor.
 
3 years at 60% is about the life I expect from the iChlor30.

Your cell is likely depleted and needs replacement.

Pentair has new higher quality IntelliChlor LT cells replacing the iChlor.
So if the cell is depleted does that mean it will not make chlorine anymore? How hard is it to replace the cell? And what will adding salt to the pool do still? And I only run the pump 8 hours a day if that matters any
 
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So if the cell is depleted does that mean it will not make chlorine anymore?

Correct
How hard is it to replace the cell?

Unscrew two unions and one electrical connector.

And what will adding salt to the pool do still?

It may cause your salt level to be too high if you do not have a salt trst kit.

And I only run the pump 8 hours a day if that matters any
It doesn’t.
 
Enter “Diagnostic Mode” by pressing and hold the MORE button for 3 seconds, until light indicates you are in diagnostic mode.

While in “Diagnostic Mode”, you can advance to the next screen by pressing the MORE button. You will not be able to go back to the previous screen. You can only advance by pressing the MORE button.

The LESS button has different functions during diagnostic mode that are explained in the manual.

Note: Be sure you are not in Output Percentage mode (Output flashing). In this mode, pressing and holding the MORE button will only fast-forward the output setting.

Tell us what is displayed as you cycle through the diagnostics.
 
Turn output up to 100%. The cell light should light. At 0 output the cell is not producing and the cell light will be off.
 

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Enter “Diagnostic Mode” by pressing and hold the MORE button for 3 seconds, until light indicates you are in diagnostic mode.

While in “Diagnostic Mode”, you can advance to the next screen by pressing the MORE button. You will not be able to go back to the previous screen. You can only advance by pressing the MORE button.

The LESS button has different functions during diagnostic mode that are explained in the manual.

Note: Be sure you are not in Output Percentage mode (Output flashing). In this mode, pressing and holding the MORE button will only fast-forward the output setting.

Tell us what is displayed as you cycle through the diagnostics.
The requested pictures from the diagnostic mode
 

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The left white knob is a control for a trichlor chlorinator. Turn it to 0. Better yet delete the tab feeder from your plumbing.

The black valve is for water flow control. Post more picture of all your plumbing.