Pentair Pool Equipment Error Code 24: How to Fix It

Q: What salt level causes Pentair Error Code 24?

Pentair Error Code 24 is triggered when the salt cell detects a salt concentration above approximately 4,000 PPM. Most Pentair salt systems operate best between 2,700 and 3,400 PPM. Always verify the reading with an independent salt test before taking corrective action, as a dirty or aging sensor can produce a false high reading.

Q: Can I swim in the pool when Error Code 24 is showing?

In most cases, yes — briefly. A moderately elevated salt level (4,000–5,000 PPM) is not immediately dangerous to swimmers, though it may cause mild eye or skin irritation. However, you should resolve the issue promptly, as prolonged high-salt operation can damage your salt cell and pool equipment. If salt levels are extremely high or the water chemistry is otherwise unbalanced, it's best to wait until corrections are made.

Q: How do I get salt levels down fast without draining the whole pool?

The only reliable way to lower salt concentration in a pool is to physically remove and replace some of the water with fresh water — there is no chemical you can add to reduce salt. Partial draining (using a submersible pump or backwash port) and refilling with fresh water is the standard and most effective method. Multiple partial drain-and-refill cycles may be needed if the salt level is very high.

Q: Why does my Pentair salt cell keep reading high salt even after I diluted the water?

If your independent salt test confirms normal levels but the Pentair control panel still shows high salt or Error Code 24, the salt cell's built-in sensor is likely dirty, scaled, or failing. Try cleaning the cell with a diluted muriatic acid solution and resetting the system. If the false reading persists after cleaning and resetting, the salt cell sensor may have failed and the cell may need to be replaced.

Q: How long does a Pentair salt cell last, and could this error mean mine is worn out?

Most Pentair salt cells last between 3 and 7 years depending on usage, water chemistry maintenance, and how consistently the cell is cleaned. An older cell may begin giving inaccurate readings or triggering false error codes as it nears the end of its life. If your cell is more than 5 years old, has visible damage to the plates, or continues to show errors despite correct salt levels and thorough cleaning, it is likely time to replace the salt cell.

Abstract

Pentair Error Code 24 is triggered when your salt chlorine generator's salt cell detects that the salt concentration in your pool water is too high — typically above 4,000 parts per million (PPM). While a little extra salt isn't immediately dangerous, running your chlorinator in high-salt water can cause scale buildup on the cell plates, reduce the system's lifespan, and potentially irritate swimmers' eyes and skin. The good news is this issue can usually be resolved by diluting your pool water and recalibrating the system.