Replacement control board kit 420020007S 461105 with 472610Z switch pad Overview A direct replacement control board kit designed to restore temperature control and responsive keypad operation in compatible pool and spa heaters. Replaces faulty control electronics and helps improve heating efficiency and reliability. Key benefits Restores temperature adjustment and keypad responsiveness when original controls fail or buttons become hard to press. Upgraded internal components including capacitors, power chips, optocoupler, and power module deliver faster, more consistent operation. Builtin protections for overheat, overvoltage, and short circuit help prevent damage to the heater control system during fault conditions. Improves heating efficiency and control stability compared to worn or failing original boards. Compatibility 420020007S replacement board compatible with MasterTemp 200, MasterTemp 250, MasterTemp 300, MasterTemp 400 heater control systems. Compatible with MaxETherm models SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD, and model 460805. Works with NA and LP series pool and spa heater electrical systems that use the listed part numbers. Package contents One 420020007S 461105 control board One 472610Z switch pad Function and performance Replaces failing control electronics to restore precise temperature control and user input functionality. Upgraded power and signal components reduce response time and increase reliability during normal use. Protective circuitry reduces risk of damage from common electrical faults, supporting safer operation of the heater control system. Typical applications Replacement for a pool heater that no longer maintains set temperature or that displays error codes related to control board faults. of a heater with unresponsive or sticky keypad buttons to restore normal user control. Preventive maintenance spare to keep on hand for seasonal servicing of pool or spa heater electrical systems. Installation and notes Designed to match the electrical connectors and control interface of the listed heater models. Confirm part numbers and compatibility before installation. Disconnect power and follow safe service procedures when replacing control electronics. Professional installation is recommended if you are not experienced with heater electrical systems. This kit provides the control board and switch pad to address common control failures while delivering improved operational stability for the specified heater models.