Product overview Replacement pool heater control board with switch membrane pad, part number 420020007S, designed for use with Pentair MasterTemp NA LP Series pool and spa heaters. Restores control and switch functions in compatible heater models. Key benefits Restores control functions: Replaces a faulty control board and switch membrane pad to normal heater operation. Complete replacement assembly: Includes the control board and the switch membrane pad for a singlestep . Compatibility clarity: Matches part number 420020007S for Pentair MasterTemp NA LP Series equipment, simplifying parts identification. Straightforward installation: Designed to fit the same mounting and connector locations as the original component for a direct swap. Reduces downtime: Keeps pool and spa heaters back in service with a focused rather than full unit replacement. What this part does This control board manages the heater control signals and user input through the switch membrane pad. When the original board or membrane fails, the heater may not respond to commands or may show error conditions. Replacing them restores the interface and control circuitry needed for normal operation. Important attributes Function: Control board and switch membrane pad assembly for heater control and user input. Compatibility: Part number 420020007S for Pentair MasterTemp NA LP Series pool and spa heaters. Included components: Control board plus switch membrane pad. Purpose: Replacement part for and maintenance of compatible heaters. Typical applications Field : a nonresponsive control panel on a MasterTemp NA LP Series heater after electrical fault or membrane wear. Preventive maintenance: Keep a spare part on hand for quick swaps during seasonal servicing to minimize heater downtime. Service technician use: Use during onsite diagnostics and to confirm faulty control board or membrane pad and restore operation. Installation notes Confirm part number 420020007S before ordering to ensure compatibility. Follow all electrical safety procedures and disconnect power before servicing the heater. If unsure about installation, consult a qualified technician experienced with pool heater electronics.