Hayward
Insufficient Heat Output
Heater runs but water does not reach set temperature; very slow heating or no noticeable temperature rise.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Undersized Hayward heater for pool volume, Excessive heat loss due to wind or no cover, Partially clogged burners, Low gas pressure
How to Fix / Troubleshooting
Safety First: Turn off power and gas before opening the heater cabinet.
- Verify heater sizing: Compare your pool volume and desired temperature rise to the BTU rating of the Hayward heater. An undersized unit will struggle in cold or windy conditions.
- Use a pool cover: Cover the pool when not in use to reduce evaporation and heat loss, especially at night.
- Inspect burners: Remove the burner tray (per manual) and check for rust, debris, or spider webs blocking ports. Clean carefully with a soft brush and compressed air.
- Check gas supply: Have a licensed gas technician verify inlet gas pressure and meter capacity while the heater is running.
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Repair Difficulty
Medium
3/5
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