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OEM Hayward FDXLTER1931 Thermistor is designed to deliver precise water temperature monitoring for Universal HC-Series HDF400 heaters, supporting efficient and safe heating operation. Built to work with Cupro Nickel heat exchangers, this thermistor resists corrosion caused by saltwater and pool chemicals, ensuring durability under constant exposure. Its high sensitivity helps optimize heater performance while minimizing risks of overheating or erratic operation. As a core safety and performance component, it is essential for extending the reliability and life of your pool heating system.
Highlights
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Engineered for HC-Series HDF Heaters: OEM part ensures accurate water temperature control specifically for HDF400 models
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Compatible with Cupro Nickel Systems: Designed to withstand corrosive conditions in saltwater pools and chemically treated environments
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Durable Under Extreme Conditions: Built from long-lasting materials that hold up to high temperatures, pressure, and repeated cycling
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Enhances Overall Heater Functionality: Supports precise thermal regulation, improving consistency and reducing unnecessary energy use
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Key Role in Heater Longevity: Helps safeguard internal components by maintaining ideal operating conditions across all cycles
Compatibility
- Hayward Universal HC-Series HDF400 Heaters
Additional Info
Diagnosing Temperature Sensor Issues
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Thermistor Specs and Local Pricing
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Confirming Model Match
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Diagram

Questions & Answers
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