Replacement Zodiac LXi/JXi Heater Ignition Module, R0456900. Highest quality replacement Zodiac R0456900 LXI hot surface ignition control module for Zodiac Jandy Legacy and LXI pool and spa heaters. This hot surface ignition control is designed for use with Zodiac Jandy Legacy LRZM pool and spa heater models 125, 175, 250, 325, and 400. Also compatible with Zodiac Jandy LXI Low NOx pool and spa heater models 250, 300, and 400.