Control board kit for MasterTemp and StaRite MaxETherm heaters — directfit replacement for electrical control systems. Key benefits — why you need this Restores reliable heater control when the original circuit board fails or malfunctions, eliminating erratic temperature regulation and unexpected shutdowns. Moistureresistant construction and quality components reduce the chance of premature failure in a humid pool or spa environment. Direct OEM references and compatibility reduce installation time and uncertainty — fits the listed models and wiring setups without major modifications. Compatibility Designed for MasterTemp models: 200, 250, 300, 400 (part number 460805). Compatible with StaRite MaxETherm heater models: SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD. Works with the full range of NA and LP series pool and spa heater electrical systems. OEM part references (for verification) Control board kit: OEM part numbers 420020007S and 461105. Switch membrane pad: OEM part numbers 420020029Z and 472610Z. Key features and materials FR2 copper foil laminate circuit board for reliable electrical paths and insulation. Enhanced solidstate capacitors to support stable voltage regulation and longer component life. Precision soldering to ensure durable connections and reduce failure points. SR waterproof coating for added protection against moisture, corrosion, and leakage in the heater enclosure. Performance and function Restores accurate temperature control and consistent heating cycles. Rapid response to thermostat changes to maintain set temperature with minimal overshoot. Designed to integrate with existing heater wiring and membrane controls for seamless operation. What's in the kit Replacement control board (matching OEM references above). Switch membrane pad corresponding to OEM references above. Installation overview (basic steps) Disconnect power to the heater before any work. Remove the heater panel to access the existing circuit board. Disconnect the membrane pad and unplug the wire connector from the old board. the board and membrane pad, reconnect the wiring, and reassemble the panel. For full instructions or modelspecific steps, refer to the detailed installation guide provided with the product or in the product description. Use scenarios / practical applications a failed control board on a residential MasterTemp 250 heater that is tripping or no longer maintaining set temperature. a StaRite MaxETherm SR333NA unit showing controlpanel errors or intermittent operation after moisture exposure. Service routine electrical maintenance on NA/LP series pool heaters to restore reliable control without replacing the entire heater. Safety and compatibility tips Always power down the heater and verify no voltage is present before starting work. Confirm OEM part numbers and model numbers before to ensure correct fit. If unsure about wiring or diagnostics, consult a certified pool / spa technician. This kit provides a direct, componentlevel solution to restore proper electrical control and reliable heating performance for the listed MasterTemp and StaRite MaxETherm models, using OEMreferenced parts and moistureresistant construction for longer service life.