Upgraded 461105 420020007S Pool Heater Control Board Kit Compatible with Pentair Mastertemp and MaxETherm Replacement for Pentair 420020007S control board kit Why this control board kit matters Restores heater operation quickly when the original control board fails, minimizing downtime. Direct replacement designed for a precise fit into units that use the 461105 or 420020007S control board, avoiding custom modifications. Uses durable printed circuit board construction and standard connector layout to deliver reliable electrical connections and consistent performance. Key features and functions Function: Replaces the heater control electronics responsible for managing start and stop sequences, sensor and switch inputs, and control signals to ignition and auxiliary components. Compatibility: Designed to be compatible with Mastertemp and MaxETherm models that require part numbers 461105 or 420020007S. Fit and form: Matches original mounting points and connector positions for a straightforward swap with the existing board. Performance: Engineered to meet the functional requirements of the original control board so the heater operates as intended under normal use conditions. Kit contents: Replacement control board supplied as a complete kit for installation in compatible heater models. Installation and maintenance Installation is typically a direct swap of the failed board for the replacement; connectors and mounting screws align with the original hardware. Basic electrical skills and adherence to the heater manufacturer service instructions are recommended for safe installation. Keeps a serviceable replacement on hand to reduce time when troubleshooting controlrelated faults. Practical use scenarios Homeowner : a failed control board after the heater quits cycling or will not initiate ignition, restoring normal heating function. Service technician : Carry as a stocked replacement part for field repairs to Mastertemp or MaxETherm heaters, enabling sameday fixes. Preventive maintenance: Swap out an aging or intermittently failing board to eliminate recurring electronic faults and reduce unexpected service calls. Who should this kit Owners of pool heaters that use part numbers 461105 or 420020007S and require a likeforlike control board replacement. Pool service professionals who need compatible, readytoinstall control boards for Mastertemp and MaxETherm systems. Note Verify the part number on the existing control board to confirm compatibility before .