Replacement control board designed for direct compatibility with MasterTemp 200, MasterTemp 250, MasterTemp 300, MasterTemp 400 and StaRite MaxETherm models SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD, 460805, as well as all NA and LP series pool and spa heater electrical systems. Key benefits Straightforward installation: Plugandplay design plus a detailed instruction manual make installation accessible for technicians and experienced DIY users. No specialized tools or professional installation required for most repairs. Broad compatibility: Works with the specific MasterTemp and StaRite MaxETherm models listed above and with NA and LP series electrical systems, allowing one replacement board to serve multiple heater types. Improved materials and construction: Manufactured on FR4 copper foil laminates with a higher quality soldering process and a robust waterproof coating to resist moisture and electrical stress. Enhanced performance and protection: Upgraded capacitors, control chips, and an improved voltage regulator module provide more stable heating control and builtin protection against overheating, overvoltage, and short circuits. Durability and reliability: Components and assembly undergo rigorous testing to provide longer service life and consistent operation under normal system loads. Function and specifications Function: Replacement electronic control board for pool and spa heater electrical systems. Restores control functions related to ignition, temperature regulation, and safety monitoring for compatible heater models. Materials: FR4 copper foil laminates, upgraded capacitors and control chips, reinforced solder joints, and waterproof coating for increased resistance to environmental conditions. Performance: Designed to improve system stability, maintain steady heating cycles, and reduce failure risk through enhanced voltage regulation and component quality. Compatibility: See compatibility list at for supported models and series. Intended as a direct replacement for the listed heater control boards. Typical applications and restore a residential pool heater after a control board failure to the heater to reliable operation. an aging or moisturedamaged control board during routine seasonal maintenance to reduce the risk of unexpected outages. Upgrade a heater control board in installations that experience frequent voltage fluctuations to benefit from improved regulation and protection. What you get A fully assembled replacement control board with enhanced components and waterproof coating. A detailed instruction manual to guide installation and basic troubleshooting. This replacement board provides a practical, higher quality option to restore or improve heater control functionality for the listed MasterTemp and StaRite MaxETherm models and NA and LP series electrical systems.