Model 420020007S Control Board Kit, Part Number 461105 with membrane switch pad 472610Z and spare part 420020029Z. Designed as a direct replacement control board kit for compatible pool and spa heater electrical systems. Key benefits Restores full control functionality when an existing heater control board fails or malfunctions. Direct compatibility with multiple heater control models to simplify replacement and reduce troubleshooting time. Includes the control board and membrane switch pad for a complete user interface replacement. Tested and quality inspected for reliable operation, with good insulation and leakage resistance to protect electrical components. What is included Control board, part number 461105, model 420020007S Membrane switch pad, part number 472610Z Reference spare part 420020029Z Compatibility Compatible with MasterTemp NA and LP series pool and spa heater electrical systems Works with the following control boards: MasterTemp 200, 250, 300, 400, 400HD Also compatible with StaRite MaxETherm models: SR200NA, SR333NA, SE400NA, SR200HD, SR333HD, SR400HD Performance and reliability Factory tested in use and inspected for quality Designed with appropriate insulation and resistance to leakage to maintain safe electrical performance Restores normal temperature control and user interface functionality when installed correctly Installation overview Turn off all power to the heater before beginning Remove the heater access panel and disconnect the connectors and screws securing the old board Unplug the existing membrane film pad and install the film pad into the replacement board Reconnect all wiring and secure the board, then restore power and verify operation Installation videos are available online for step by step guidance if needed Typical applications a failed control board in a pool heater that no longer powers up or displays error codes Restore user interface and temperature control after membrane pad wear or button failure Service older heater systems during routine maintenance to ensure continued reliable operation Why choose this kit Complete replacement set that addresses both electronics and user interface Broad compatibility across multiple heater control models reduces the need to source multiple parts Quality inspected to help ensure dependable performance after installation Note Always follow the heater manufacturer safety instructions and disconnect electrical power before servicing.