Wide Compatibility: This board is a replacement of Mastertemp 200,Mastertemp 250,Mastertemp 300,Mastertemp 400,MasterTemp 400HD and for Sta-Rite Max-E-Therm heaters: SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD, 460805. And all NA and LP Series Pool/Spa heater electrical systems Function: 42002-0007S control board kit can easily adjust and maintain the desired temperature of their pool water, and can provide stable heating performance, quickly increase temperature, ensuring a comfortable swimming experience.If your pool and spa heater old control board no longer starts up your heater or the display no longer illuminated or pool water heating so slow,you will need to replace the control circuit board kit Quality: This 42002-0007S control board kit features high-quality copper foil laminate, upgraded solid capacitors, high-precision soldering process, and SR waterproof coating,which has excellent insulation performance and is resistant to damage,moisture,and leakage,ensuring long-lasting performance and reliability Installation: First,turn off all power and open the top of the heater,remove the film pads from the old board and remove the wire connectors to the old board.Unscrew screws that hold the board in place.Remove old board completely.Screw the new board back in and insert the membrane pads into the ribbon cable connections.Reconnect all wires and close out the master temp or max e therm heater Confident Purchase: We are committed to providing excellent customer service and offer 24-hour support.We are committed to making sure that you leave this transaction satisfied.If you're unhappy with the product for any reason, you may return it back for your money - back or a replacement within 30 days 42002-0007S Control Board Kit for Pentair MasterTemp & Sta-Rite Max-E-Therm Pool Heaters - Replacement for 461105, NA/LP Series, Includes 472610Z Switch Membrane Pad (Upgraded)