{"product_id":"spanet-sv-optical-temp-sensor","title":"SpaNET SV2, SV3, SV4 Optical Water Sensor and Thermistor Assembly","description":"\u003ch3\u003eSpanet SV2, SV3, SV4 Optical Water Sensor and Thermistor Assembly\u003c\/h3\u003e\u003cp\u003e\u003cspan\u003eSpanet SV2, SV3 \u0026amp; SV4 Optical Water Sensor and Thermistor Assembly to suit SV Series heater tubes (V1 \u0026amp; V2 models). This complete heater sensor assembly includes the optical water sensor, thermistor, clear plastic housing, and O-ring.\u003c\/span\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003ePhysically Stocked, unlike most \"drop-shipping\" websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eShipped from VIC, NSW, WA, QLD\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThis is a common replacement part on Spanet SV systems when a spa is showing Water Prime, heater sensor, or unstable temperature-related faults. It is also a known leak point on some spas, particularly where water balance has been poor or the sensor well has deteriorated over time.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhere there is corrosion around the sensor, we recommend replacing \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/spanet-sv-heater-assembly\" rel=\"noopener\" target=\"_blank\" title=\"Spanet Heater - SV2 SV3 SV4\"\u003ethe entire heater assembly (here)\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon symptoms this part may relate to\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eWater Prime errors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHeater Sensor errors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncorrect or unstable temperature readings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTemperature display stuck on 99.9°\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eVisible leaking from the heater sensor area\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon Spanet fault codes associated with sensor or water flow issues\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eER-2 - Heater sensor fault \/ heater sensor connection issue\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eER-3 - Water Prime \/ insufficient water flow or air detected in heater tube\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eER-5 - Over-temperature \/ abnormal temperature reading condition\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTemperature reading of 99.9°\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Fault codes can have more than one cause. Dirty filters, low water level, airlocks, pump problems, damaged plugs, and corroded sensor wells can produce similar symptoms. Replacing the sensor will not fix every spa with these errors.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSuits Spanet SV Series control systems with the square plug\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuits: SV2, SV3, SV4\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuits: SV Series heater tubes V1 and V2\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDoes not suit: XS Series\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDoes not suit: SV Mini\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eOptical water sensor and thermistor assembly\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClear plastic housing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eO-ring\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUse a small amount of silicone lubricant on the O-ring during installation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInspect the sensor well carefully before fitting the new part\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIf the sensor well is corroded, pitted, cracked, or leaking, the new sensor may also leak or fail prematurely\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAlways isolate power before carrying out inspection or replacement\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon cause of failure\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLow pH, poor water chemistry, and long-term corrosion are common reasons these assemblies leak or fail. If water balance has been neglected, inspect surrounding heater components carefully before ordering and fitting replacement parts.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease check before ordering\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis part is for Spanet SV2, SV3 and SV4 systems only. Please check the plug style, controller model, and heater configuration carefully before purchase. If you are unsure, send us clear photos of your spa pack, heater tube, plug, and the old sensor assembly so we can help identify it correctly.\u003c\/span\u003e\u003c\/p\u003e","brand":"SpaNet","offers":[{"title":"Default Title","offer_id":34537663070364,"sku":"SN-SV-HTR-SA","price":97.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/spanet-sv2-sv3-sv4-optical-water-sensor-and-thermistor-assembly-550.webp?v=1782219014","url":"https:\/\/heaterandspaparts.com.au\/zh-hans\/products\/spanet-sv-optical-temp-sensor","provider":"Heater and Spa Parts","version":"1.0","type":"link"}