Is your heater failing to start or showing persistent error codes? This replacement control board restores reliable operation so your pool or spa heats when you need it, without waiting for a service visit or risking a poor fit from a generic part. Key benefits Restores heater function: replaces faulty control electronics that cause nostarts, inconsistent temperatures, and recurring error codes. Exactfit compatibility: built to match original specifications and form factor for direct swap with compatible heater models. DIY friendly installation: straightforward fit and simple steps make replacement possible without expensive professional service. Works with both gas types: compatible with natural gas and propane models for flexible use across NA and LP systems. Reliable performance: designed to full control operation so your heater delivers consistent warmth. Compatible with the following systems and control boards All Master Temp NA and LP series pool and spa heater electrical systems MasterTemp 200 control board MasterTemp 250 control board MasterTemp 300 control board MasterTemp 400 control board MasterTemp 400HD control board StaRite MaxETherm SR200NA control board StaRite MaxETherm SR333NA control board StaRite MaxETherm SE400NA control board StaRite MaxETherm SR200HD control board StaRite MaxETherm SR333HD control board StaRite MaxETherm SR400HD control board What it does Replaces the heater control board to restore ignition control, temperature regulation, and error reporting. Matches mounting points and electrical connections of the original board to minimize wiring changes and reduce installation time. Eliminates uncertainty about compatibility so you can be confident the replacement will work with the specified heater models. Practical applications Weekend pool readiness: swap the board and have your heater working again in time for weekend use. Daily spa use: restore dependable temperature control for morning or evening spa routines. Event preparation: fix heating issues before a planned pool party to ensure comfortable water temperature for guests. Notes Confirm your heater model and control board number against the compatible list before ordering. Installation requires basic electrical safety precautions and following manufacturer guidelines for disconnecting power and gas before service.