{"product_id":"pack-ms90u-825-3rd-sensor","title":"MASTER SPAS PACK, MS90U 825 3RD SENSOR - x300739","description":"\u003ch2\u003e\u003cspan\u003eMASTER SPAS PACK, MS90U 825 3RD SENSOR - x300739\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003ePACK, MS90U 825 3RD SENSOR CONTROL PACK FOR MASTER SPAS\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003e\u003cspan\u003eWhat our Experts Think\u003c\/span\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"9tey3c\" data-start=\"27\" data-end=\"316\"\u003e\n\u003cp data-start=\"29\" data-end=\"316\"\u003e\u003cstrong data-start=\"29\" data-end=\"66\"\u003eHigh-Performance OEM Control Pack\u003c\/strong\u003e\u003cbr data-start=\"66\" data-end=\"69\"\u003eThe \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eMaster Spas MS90U 825 3rd Sensor Control Pack X300739\u003c\/span\u003e\u003c\/span\u003e is a genuine replacement spa pack engineered to restore full system functionality and maintain the original performance standards of compatible Master Spas models. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1bkipto\" data-start=\"318\" data-end=\"562\"\u003e\n\u003cp data-start=\"320\" data-end=\"562\"\u003e\u003cstrong data-start=\"320\" data-end=\"359\"\u003eAdvanced 3-Sensor Monitoring System\u003c\/strong\u003e\u003cbr data-start=\"359\" data-end=\"362\"\u003eEquipped with a \u003cstrong data-start=\"380\" data-end=\"408\"\u003ethird temperature sensor\u003c\/strong\u003e, this system improves monitoring accuracy and helps maintain stable water temperature and safer heater operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"8pjeqo\" data-start=\"564\" data-end=\"838\"\u003e\n\u003cp data-start=\"566\" data-end=\"838\"\u003e\u003cstrong data-start=\"566\" data-end=\"602\"\u003eComplete Control System Assembly\u003c\/strong\u003e\u003cbr data-start=\"602\" data-end=\"605\"\u003eThe pack typically includes the \u003cstrong data-start=\"639\" data-end=\"696\"\u003ecircuit board, heater, heater gaskets, and tailpieces\u003c\/strong\u003e, providing a comprehensive replacement solution rather than requiring multiple individual components. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"9xtfyc\" data-start=\"840\" data-end=\"1066\"\u003e\n\u003cp data-start=\"842\" data-end=\"1066\"\u003e\u003cstrong data-start=\"842\" data-end=\"879\"\u003ePowerful 4.0kW Heater Performance\u003c\/strong\u003e\u003cbr data-start=\"879\" data-end=\"882\"\u003eBuilt with an \u003cstrong data-start=\"898\" data-end=\"927\"\u003e825 Incoloy 4.0 kW heater\u003c\/strong\u003e, it delivers efficient heating and dependable durability under demanding spa operating conditions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"fqjk6v\" data-start=\"1068\" data-end=\"1316\"\u003e\n\u003cp data-start=\"1070\" data-end=\"1316\"\u003e\u003cstrong data-start=\"1070\" data-end=\"1118\"\u003eBroad Compatibility Across Master Spas Lines\u003c\/strong\u003e\u003cbr data-start=\"1118\" data-end=\"1121\"\u003eFrequently used with several \u003cstrong data-start=\"1152\" data-end=\"1227\"\u003eH2X Swim Spas, Michael Phelps series hot tubs, and Twilight Series spas\u003c\/strong\u003e, making it a versatile upgrade for many systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"7vms87\" data-start=\"1318\" data-end=\"1564\"\u003e\n\u003cp data-start=\"1320\" data-end=\"1564\"\u003e\u003cstrong data-start=\"1320\" data-end=\"1367\"\u003eStraightforward Replacement for Older Packs\u003c\/strong\u003e\u003cbr data-start=\"1367\" data-end=\"1370\"\u003eDesigned to replace earlier systems such as \u003cstrong data-start=\"1416\" data-end=\"1440\"\u003eMS501X control packs\u003c\/strong\u003e, helping extend the life of existing spas without requiring a full system overhaul.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cspan\u003e\u003cbr\u003eQ\u0026amp;A\u003c\/span\u003e\u003c\/h5\u003e\n\u003cp data-start=\"72\" data-end=\"449\"\u003e\u003cstrong data-start=\"72\" data-end=\"139\"\u003eQ: What is the Master Spas MS90U 825 3rd Sensor Pack (X300739)?\u003c\/strong\u003e\u003cbr data-start=\"139\" data-end=\"142\"\u003eA: The Master Spas MS90U 825 3rd Sensor Pack (X300739) is a genuine OEM spa control pack designed to manage heating, pumps, and overall system functions in compatible Master Spas hot tubs and swim spas. It ensures reliable spa performance and accurate system control. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"451\" data-end=\"711\"\u003e\u003cstrong data-start=\"451\" data-end=\"496\"\u003eQ: What does the “3rd sensor” feature do?\u003c\/strong\u003e\u003cbr data-start=\"496\" data-end=\"499\"\u003eA: The integrated third sensor provides enhanced temperature monitoring and system safety, helping maintain precise water temperature and improving overall spa performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"713\" data-end=\"1045\"\u003e\u003cstrong data-start=\"713\" data-end=\"776\"\u003eQ: Which spas are compatible with the X300739 control pack?\u003c\/strong\u003e\u003cbr data-start=\"776\" data-end=\"779\"\u003eA: This control pack is used in select Master Spas models, including various \u003cstrong data-start=\"856\" data-end=\"875\"\u003eTwilight Series\u003c\/strong\u003e, \u003cstrong data-start=\"877\" data-end=\"894\"\u003eH2X Swim Spas\u003c\/strong\u003e, and \u003cstrong data-start=\"900\" data-end=\"934\"\u003eMichael Phelps swim spa models\u003c\/strong\u003e. Always confirm compatibility with your spa model before installation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1047\" data-end=\"1351\"\u003e\u003cstrong data-start=\"1047\" data-end=\"1110\"\u003eQ: What are the key features of the MS90U 825 control pack?\u003c\/strong\u003e\u003cbr data-start=\"1110\" data-end=\"1113\"\u003eA: Key features include OEM-quality construction, advanced temperature monitoring with a third sensor, durable design for long-term spa operation, and compatibility with MS90U-based control systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1353\" data-end=\"1576\"\u003e\u003cstrong data-start=\"1353\" data-end=\"1422\"\u003eQ: Does the X300739 control pack include a topside control panel?\u003c\/strong\u003e\u003cbr data-start=\"1422\" data-end=\"1425\"\u003eA: No. The spa-side control panel is typically sold separately and must be connected for full system operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1578\" data-end=\"1867\"\u003e\u003cstrong data-start=\"1578\" data-end=\"1636\"\u003eQ: Why replace your spa control pack with the X300739?\u003c\/strong\u003e\u003cbr data-start=\"1636\" data-end=\"1639\"\u003eA: Replacing a faulty control pack with the OEM X300739 helps restore proper heating, pump operation, and system reliability, ensuring your Master Spas hot tub runs efficiently and safely. \u003cspan class=\"\" data-state=\"delayed-open\" aria-describedby=\"radix-_r_3f_\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003e\u003cspan\u003eMaintenance Tips\u003c\/span\u003e\u003c\/h5\u003e\n\u003cul data-start=\"159\" data-end=\"1161\"\u003e\n\u003cli data-section-id=\"zjouxa\" data-start=\"159\" data-end=\"365\"\u003e\n\u003cp data-start=\"161\" data-end=\"365\"\u003e\u003cstrong data-start=\"161\" data-end=\"191\"\u003eInspect Sensors Regularly:\u003c\/strong\u003e Ensure the third temperature sensor and wiring remain clean and securely connected to maintain accurate water temperature monitoring. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"mzmo67\" data-start=\"366\" data-end=\"526\"\u003e\n\u003cp data-start=\"368\" data-end=\"526\"\u003e\u003cstrong data-start=\"368\" data-end=\"411\"\u003eProtect the Control Pack from Moisture:\u003c\/strong\u003e Keep the equipment compartment dry and well-sealed to prevent water damage to the circuit board and electronics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"n2nmpx\" data-start=\"527\" data-end=\"689\"\u003e\n\u003cp data-start=\"529\" data-end=\"689\"\u003e\u003cstrong data-start=\"529\" data-end=\"565\"\u003eMaintain Proper Water Chemistry:\u003c\/strong\u003e Balanced pH and sanitizer levels help prevent corrosion and scale buildup that can affect sensors and heater performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"myxfnq\" data-start=\"690\" data-end=\"837\"\u003e\n\u003cp data-start=\"692\" data-end=\"837\"\u003e\u003cstrong data-start=\"692\" data-end=\"725\"\u003eCheck Electrical Connections:\u003c\/strong\u003e Periodically inspect wiring, terminals, and connectors for looseness or corrosion to ensure stable operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"mrn1cu\" data-start=\"838\" data-end=\"961\"\u003e\n\u003cp data-start=\"840\" data-end=\"961\"\u003e\u003cstrong data-start=\"840\" data-end=\"867\"\u003eKeep Ventilation Clear:\u003c\/strong\u003e Ensure airflow around the control pack so heat can dissipate properly during spa operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"4go3rh\" data-start=\"962\" data-end=\"1161\"\u003e\n\u003cp data-start=\"964\" data-end=\"1161\"\u003e\u003cstrong data-start=\"964\" data-end=\"1000\"\u003eSchedule Periodic System Checks:\u003c\/strong\u003e Routine inspection of pumps, heater, and sensors helps maintain precise temperature control and overall spa performance. \u003cspan class=\"\" data-state=\"instant-open\" aria-describedby=\"radix-_r_28_\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MASTER SPAS","offers":[{"title":"Default Title","offer_id":45484570542271,"sku":"x300739","price":522.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0683\/5703\/0079\/files\/0008617_X300739.jpg_550.jpg?v=1775915630","url":"https:\/\/backyardprovider.com\/products\/pack-ms90u-825-3rd-sensor","provider":"Your Outdoor Setup Starts Here","version":"1.0","type":"link"}