The most likely fix when an AquaRite is not making chlorine:the T-Cell-15 is at end-of-life. Confirm with the AquaRite's diagnostic display: if instant salt reads well below your lab salinity, cell voltage is high, and amps are low, the plates have lost their coating. Acid-wash first — scale mimics dead-cell symptoms. If the diagnostic still fails after a clean cell, replace it. The job is a 45-minute swap with two unions and a cable connector.
AquaRite T-Cell-15 symptom quick reference
| Code / symptom | What it means | Likely cause | DIY or pro? |
|---|---|---|---|
| Chlorine reads zero, display shows generation | Cell not actually producing chlorine | Scaled plates or a cell at end-of-life | DIY first, then pro |
| Instant salt reads 500–1,500 ppm below lab salinity | Cell conductance is reading low | Scale on the plates or a worn plate coating | DIY first, then pro |
| High cell voltage with low amps in the diagnostic | Plates have lost their ruthenium coating | End-of-life T-Cell-15 — no cleaning brings the coating back | DIY first, then pro |
| Inspect Cell light on | Scheduled service reminder | Cell due for inspection and an acid-wash; clear the timer after service | DIY |
| Intermittent No Flow with a working pump | Flow signal dropping out | Sticky flow switch — not always the cell | DIY first, then pro |
Most common symptoms
- Pool chlorine reads zero despite the AquaRite displaying generation.
- Instant salt reads 500–1,500 ppm below actual lab salinity.
- Inspect Cell light is on (or has been on for a long time).
- AquaRite shows “No Flow” intermittently with a working pump — sticky flow switch, not always the cell.
- Cell shell is discolored, plates look pitted or eroded when inspected.
Diagnostic walkthrough
- Verify actual salinity at a pool store. Don't trust the AquaRite's number until you know what the water actually is. Target is 3,200 ppm.
- Run the AquaRite diagnostic. Hold the Diagnostic button. Cycle through: instant salt, cell voltage, cell amps, water temp, desired output, percentage output. In our field experience on current AquaRite firmware, a healthy cell at 3,200 ppm and 75°F shows cell voltage in the low-to-mid 20-volt range and amps in the 5–6 A range. Maxed-out voltage with low amps points toward a worn cell. Confirm the expected diagnostic ranges against your AquaRite's service manual revision.
- Pull the cell, inspect, acid-wash if scaled. Hard South Florida water lays scale on the plates within a year. A 4:1 dilution (four parts water to one part muriatic acid) bath, plates submerged ~10 minutes, restores most cells that just look bad. Always pour acid into water, never water into acid; wear chemical splash goggles, gloves, and long sleeves; work outdoors; and never mix with chlorine products. Hayward's cell-cleaning instructions in the AquaRite manual are the authoritative reference for ratio and dwell time. Re-run the diagnostic afterward.
- If diagnostics still fail after acid wash, the cell is dead. The titanium plates lose their ruthenium coating over time. No cleaning brings that back.
Step-by-step replacement
- Power down the pump at the timer or controller. Power down the AquaRite at the breaker.
- Close suction and return valves to isolate the cell housing.
- Unscrew the two unions on the cell housing. Have a towel ready — about a cup of water comes out.
- Disconnect the cell cable at the AquaRite end (or at the cell itself if it has a quick-connect).
- Lift the old cell out. Note flow direction arrow.
- Install the new cell with the same flow direction. Replace the union o-rings — never reuse old ones on a salt cell. They harden and weep.
- Reconnect the cable. Open the valves. Prime the pump.
- Restore power. Run the AquaRite diagnostic. Voltage should be 22–26 V, amps 5–6 A. New cell — clear the Inspect Cell timer per the AquaRite manual sequence.
South Florida-specific failure modes
- Calcium scale. Hard fill-water on the southeast coast lays scale on cell plates 2–3 times faster than soft inland water. Acid-wash quarterly on coastal pools.
- Salt-air corrosion on the cell cable connector. The plug at the AquaRite head corrodes. Dielectric grease at install. Replace the cable if green corrosion is visible.
- Chlorine demand from heat and UV. Florida pools demand more chlorine than northern pools, which means more cell hours per year, which means shorter cell life. 4–5 years is normal here vs. 7–10 in mild climates.
When it's time to replace
If the cell has 8,000+ run hours, has been acid-washed twice this year, and the diagnostic still fails — replace. There is no rebuilding a cell. See our salt chlorine generators primer for the broader system context, and our coastal salt-air guide for why coastal cells age faster.
When to call a pro
If you have never pulled a cell, the AquaRite breaker scares you, or your pad has a tangled wiring nest from a past renovation — call. In Florida, residential pool repair work is regulated by the DBPR (RP / CPC license categories). A pool equipment repair visit gets the cell tested, the salinity verified, and a flat-rate quote in writing before any work happens.
Pool salt calculator
Enter your pool size, current salt reading, and your cell's target. Math: (target − current) × gallons ÷ 120,000 = lbs of salt.
From a salt test strip or your cell's display.
Add ≈ 90 lbs of pool salt
That's 3 × 40-lb bags (exact math: 87.5 lbs to go from 2,500 to 3,200 ppm in 15,000 gallons). Broadcast it into the pool — never the skimmer — run the pump 24 hours, then retest.
Use 99.8%+ pure sodium chloride pool salt only — never water-softener, rock, or iodized salt.
Frequently asked questions
Run the AquaRite diagnostic with salt at 3,200 ppm and water above 60°F. If instant salt reads 500–1,500 ppm below the actual lab reading and cell voltage is high while amps are low, the cell plates have lost their coating. That is dead. A reversing-cycle test that fails to reverse confirms it.
Hayward rates the T-Cell-15 at 10,000 hours of run time, which works out to 4–7 years on a typical Florida pool depending on chlorine demand. Coastal pools running aggressive output during summer wear cells faster — 3–5 years is normal within a mile of the ocean.
Yes if you can shut off the pump, depressurize the line, and unscrew two unions. The cell carries no live electrical when the pump is off and the AquaRite is powered down. Reverse for install, then run the AquaRite startup sequence to register the new cell.
Inspect Cell is a scheduled reminder, not a fault. It fires every 500 hours of cell run time. Pull the cell, look for scale, acid-wash if needed, hit Diagnostic > More on the AquaRite to clear the reminder.
In South Florida, a fair installed price typically lands in the $800–$2,100 range depending on cell model and supplier season, and should bundle the cell, a new flow switch if the old one is sticky, and a salinity recheck. Get a written flat quote before any work.
Mix a 4:1 dilution — four parts water to one part muriatic acid — and always pour acid into water, never water into acid. Submerge the plates about 10 minutes wearing chemical splash goggles, gloves, and long sleeves, working outdoors and away from any chlorine products. Rinse, reinstall, and re-run the AquaRite diagnostic. Hard South Florida water scales plates within a year, so quarterly washes are normal on coastal pools.
At 3,200 ppm salt and 75°F water, a healthy cell shows voltage in the low-to-mid 20-volt range and amps around 5–6. After a new cell install, look for 22–26 volts and 5–6 amps. Maxed-out voltage with low amps is the signature of a worn plate coating. Confirm the exact ranges against your AquaRite's service manual revision.
Intermittent No Flow with a working pump usually points to a sticky flow switch, not the cell. Check the switch before spending on a new T-Cell-15 — it is a common failure, and a fair installed replacement quote should bundle a new flow switch when the old one is suspect.
Three reasons. Florida heat and UV drive higher chlorine demand, which means more cell run hours per year. Hard southeast-coast fill water lays calcium scale on the plates 2–3 times faster than soft inland water. And salt air corrodes the cell cable connector at the AquaRite head. Expect 4–5 years here versus 7–10 in mild climates.
Yes — replace the union o-rings every time and never reuse old ones on a salt cell. They harden and weep. Note the flow direction arrow when the new cell goes in, and put dielectric grease on the cable connector at install to slow salt-air corrosion; replace the cable if green corrosion is visible.
Want the cell swapped and verified for you?
We replace T-Cell-15s across Palm Beach and Broward — cell, flow switch check, and salinity verification in one visit.