HDXFHLI400 | Hayward High Limits For HC-Series HDF400 | HDXFHLI001 Pentair max-e-therm Hi Limit Switch making it a quintessential choice

making it a quintessential choice for efficient water flow management

Built with durability in mind

Compatible with Multiple Filters: Designed for use with a wide range of Jandy cartridge and D

in-stock zippered filter bag for vac sweep

An error was detected in the ignition control board

HDXFHLI400 | Hayward High Limits For HC-Series HDF400 | HDXFHLI001 Pentair max-e-therm Hi Limit Switch making it a quintessential choiceOEM Hayward High Limits HDXFHLI400, formerly known as HDXFHLI001, are essential safety components engineered for use with Universal HC Series HDF400 heaters. These high limit switches are responsible for monitoring the heater's water temperature and automatically shutting off operation if temperatures exceed safe thresholds. This critical function helps prevent overheating, protects internal components, and promotes long term heater reliability. Built