Product description Overview Replacement control board kit designed for direct compatibility with the heater models listed below. Use this board to restore reliable temperature control, resolve unresponsive or stiff buttons, and improve heating performance. Key benefits Restores control functions: Replaces faulty boards that cause temperature adjustment failures or nonresponsive controls. Solves button and keypad issues: Addresses membrane pad and button hardness problems that make input difficult or inconsistent. Improves heating performance: Upgraded components and improved insulation help maintain stable operation and efficient heat output. Compatibility Compatible with the following heater models: Mastertemp 200, Mastertemp 250, Mastertemp 300, Mastertemp 400 StaRite MaxETherm SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD, 460805 Construction and materials FR2 copper foil laminate substrate for reliable electrical pathways Upgraded solid state capacitors for improved longevity and stability precision soldering for consistent connections SR waterproof coating for enhanced insulation and protection against moisture Function and performance Replaces defective control electronics to restore accurate temperature adjustment Reduces failures caused by degraded components or poor contacts Designed to maintain consistent operation under typical pool heater conditions Installation overview Safety first: Turn off all electrical power to the heater before starting work. Access: Open the heater to reach the existing control board. Disconnect: Unplug the membrane pad connector and remove the wire harness from the old board. : Remove the old board and install the control board, reconnect the wire harness and membrane pad, then close the heater and restore power. Note: Follow manufacturer service guidelines and local electrical codes when performing the replacement. Practical use scenarios scenario: a control board in a Mastertemp 250 after the unit stops responding to temperature adjustments, restoring normal control and operation. Maintenance scenario: Swap a failing board on an SR333NA heater where hard or unresponsive buttons prevent reliable keypad input. Seasonal preparation: Install the replacement board before peak use to improve responsiveness and reduce the chance of controlrelated downtime during heavy use periods. Why choose this board Built with durable materials and upgraded components to failing control electronics Direct compatibility with the listed models for a straightforward replacement Clear, practical installation steps to enable efficient swapout when performed by qualified personnel Important Ensure power is fully disconnected before attempting installation. If you are not comfortable working with electrical components, hire a qualified technician to perform the replacement.