Upgrade control board kit model 420020007S 461105. Direct replacement control board solution for pool and spa heater electrical systems compatible with Pentair MasterTemp, StaRite, and MaxETherm All NA and LP series. Key benefits Restores heater control functions quickly: replaces a failed or malfunctioning control board to bring ignition, monitoring, and control circuits back into service. Saves time: designed to match the original board footprint and connector layout for straightforward installation and reduced downtime. Reliable electrical performance: engineered to meet the electrical requirements of compatible heater models for stable operation and consistent control responses. Practical replacement kit: intended as a direct swap for the specified control board assemblies, eliminating complex rewiring or extensive modifications. Main features Function: control board kit replacement for pool and spa heater electrical systems, handling ignition control, status signals, and safety interlocks as required by the original equipment. Compatibility: fits Pentair MasterTemp, StaRite, and MaxETherm All NA and LP series pool and spa heaters that use models 420020007S or 461105 control boards. Form factor: compact replacement board designed to align with the original mounting points and connector locations for plugandplay style fitment. Performance: built to restore factorylevel control behavior and support normal heater cycling and diagnostics. Applications and scenarios Scenario 1: A backyard pool heater fails to ignite and shows error codes related to the control board. Replacing the faulty board with this kit restores ignition control and diagnostic functions without major system changes. Scenario 2: During seasonal maintenance, a technician finds intermittent control faults. Installing the replacement board eliminates erratic behavior and returns the heater to reliable operation. Scenario 3: As part of a heater refurbishment, the original control board is swapped for this replacement to ensure continued compatibility with existing wiring harnesses and sensors. What to expect A control board kit supplied to match the original electrical layout for the listed models. Compatibility verification is recommended prior to by checking the existing board part numbers 420020007S or 461105 and the heater model series. Professional or qualified technician installation is advised to ensure safe and correct electrical connections. This replacement control board kit provides a practical, functionfocused option for returning compatible pool and spa heaters to reliable operation while minimizing installation complexity.