Hayward Pool AquaRite Error Code 18: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 18
- Brand
- Hayward
- Product Type
- pool_equipment
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Multimeter
- Wire brush
- Safety gloves
- Safety goggles
- Muriatic acid (for cleaning)
How to Fix Error Code 18
-
Turn Off Power to the System
Always disconnect power before working on electrical pool equipment. -
Inspect the Cell Connections
-
Check the Cell for Scale Buildup
Wear gloves and eye protection when handling acid. -
Measure Cell Voltage
-
Replace the Cell (If Voltage is Low)
-
Reset the System
Parts You May Need
Hayward AquaRite replacement cell (T-CELL-9 or T-CELL-15)
Check Price on Amazon
Hayward AquaRite replacement cell (T-CELL-9 or T-CELL-15)
Check Price on Amazon
Hayward AquaRite replacement cell (T-CELL-9 or T-CELL-15)
Check Price on Amazon
Hayward AquaRite replacement cell (T-CELL-9 or T-CELL-15)
Check Price on Amazon
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When to Call a Professional
If the voltage remains low after replacing the cell, the control board may be faulty. Contact a pool technician for further diagnosis.Frequently Asked Questions
What does error 18 mean on a Hayward AquaRite?
Error 18 indicates low voltage from the salt chlorine generator cell, usually due to a worn-out cell or poor connection.
How do I reset a Hayward AquaRite after error 18?
Press the Diagnostic button until the error clears. If it persists, fix the underlying issue first.
Can I clean a Hayward AquaRite cell?
Yes, remove the cell and soak it in a diluted muriatic acid solution (4:1 water to acid) for 15 minutes to remove scale buildup.
What voltage should a Hayward AquaRite cell have?
Normal operating voltage is 20-30 VDC. Below 20 VDC indicates a failing cell.
How long does a Hayward AquaRite cell last?
Typically 3-5 years depending on usage and water chemistry.