{"product_id":"hayward-fdxlter1931-thermistor","title":"Hayward HDF400 Thermistor","description":"\u003cp\u003eThe Hayward FDXLTER1931 is the thermistor for the HDF400 heater. It is the genuine Hayward part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it does\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe thermistor is the water temperature sensor. The heater control reads it to decide when to fire and when the pool has reached the set point. When it drifts or fails open, the display shows the wrong temperature or the heater throws a sensor fault and refuses to run.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBefore you order\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHayward uses several thermistors across its heater lines. Confirm your heater calls for FDXLTER1931 before ordering.\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":48624886055124,"sku":"HAY-151-0119","price":59.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_ac624729-87bf-4cb7-95a5-746ba4db55dd.jpg?v=1788649881","url":"https:\/\/www.activepoolsupply.com\/products\/hayward-fdxlter1931-thermistor","provider":"Active Pool Supply","version":"1.0","type":"link"}