Pentair Pool Equipment Error Code 27: How to Fix It

Q: What does Pentair Error Code 27 mean?

Pentair Error Code 27 means the salt chlorine generator's output percentage is running too high. This could be due to the output being manually set too high, elevated salt levels in the pool, a malfunctioning flow switch, or a failing salt cell that is no longer operating efficiently.

Q: Can I still swim in my pool when Error Code 27 appears?

It depends on your actual chlorine levels. Test your free chlorine before swimming — safe levels are between 1–4 ppm. If chlorine is above 5 ppm, avoid swimming until levels drop. High chlorine can cause skin and eye irritation. Turn down the cell output immediately and retest after a few hours.

Q: How often should I clean my Pentair salt cell?

Most Pentair salt cells should be inspected and cleaned every 3–6 months, or whenever you notice visible scale buildup on the plates. Some Pentair systems have a 'Cell Cleaning' indicator light to alert you. Regular cleaning extends the life of the cell and prevents errors like Code 27.

Q: What is the ideal salt level for a Pentair salt chlorine generator?

Pentair salt chlorine generators typically operate best with a salt level of 2700–3400 ppm, with 3200 ppm being the recommended target. Levels above 3500 ppm can stress the cell and cause over-production of chlorine, potentially triggering Error Code 27.

Q: How long do Pentair salt cells last?

A Pentair salt cell typically lasts between 3 and 7 years, depending on how well the pool water chemistry is maintained, how often the cell is cleaned, and how many hours per day the system runs. Pools with consistently balanced chemistry tend to see longer cell lifespans.

Abstract

Pentair Error Code 27 indicates that your salt cell's chlorine output percentage is set or running too high, which can lead to over-chlorination of your pool water. This typically happens when the output setting is manually turned up too far, when the pool's salt level is off, or when the cell itself is malfunctioning. Addressing this promptly is important because excessively high chlorine output can irritate swimmers' skin and eyes, damage pool equipment, and cause chemical imbalances in the water.