upgraded control board kit compatible with Mastertemp and MaxETherm pool heaters. This replacement restores heater control functions and includes the switch membrane pad needed for responsive keypad operation. Key benefits Restores core heater functions: returns ignition control, temperature regulation, and diagnostic feedback to working condition. Complete replacement kit: includes control board parts 420020007S and 461105 plus switch membrane pad 472610Z for a full keypad and electronics refresh. Improved reliability: upgraded components help reduce intermittent faults and display or control failures associated with worn boards and membranes. Straightforward assessment: intended as a like for like replacement when original control board or membrane pad has failed or shows error codes. What this product does Replaces the faulty control electronics that manage heater startup, burner control, temperature set points, and fault reporting. Replaces the worn or unresponsive switch membrane pad to restore accurate keypad input and tactile feedback. Compatibility Replacement kit for units that use control board 420020007S and part 461105, and membrane pad 472610Z. Compatible with Mastertemp and MaxETherm pool heater models that use these part numbers. Verify your heater part numbers before . Key attributes Function: control board kit plus switch membrane pad for pool heater control and user interface. Models: 420020007S, 461105, 472610Z included in kit. Material and construction: printed circuit board electronics and durable membrane switch designed for heater user interface replacement. Performance: restores control responsiveness and diagnostic functions to original operating condition when installed correctly. Use scenarios a failed control board that prevents the heater from igniting or maintaining temperature. Swap in a membrane pad and control board during off season maintenance to avoid unexpected failures when reopening the pool. a heater showing control panel errors or unresponsive buttons to restore normal operation without replacing the whole heater. Installation and notes Intended as a direct replacement for the listed part numbers. Confirm your heater uses part numbers 420020007S, 461105, and 472610Z before ordering. Professional installation or familiarity with electrical components and safety procedures is recommended to ensure correct fit and safe operation. This kit is for replacing control electronics and the switch membrane pad only. It does not include external housings, sensors, or other unrelated parts. This control board kit provides a practical option to restore heater control and keypad function for compatible Mastertemp and MaxETherm units. Verify compatibility and consult a qualified technician for installation if needed.