{"product_id":"haywardhseriesheater135fhilimithaxhli1930hpphaxhli1930","title":"Hayward H-Series Heater 135F Hi-Limit | HAXHLI1930","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003eHayward HAXHLI1930 Hi-Limit Switch (135°F) for H-Series Pool Heaters\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Hayward \u003cstrong\u003eHAXHLI1930\u003c\/strong\u003e is a genuine OEM \u003cstrong\u003e135°F high limit switch\u003c\/strong\u003e (hi-limit) used on compatible\n    Hayward \u003cstrong\u003eH-Series\u003c\/strong\u003e pool and spa heaters. This safety switch helps protect the heater by shutting the unit down if\n    internal water temperature rises above the safe limit—commonly due to low water flow, blocked circulation, or scaling.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eFits \/ Compatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCommonly used on Hayward \u003cstrong\u003eH-Series ED1\u003c\/strong\u003e and \u003cstrong\u003eED2\u003c\/strong\u003e style heaters\u003c\/li\u003e\n    \u003cli\u003eAlso commonly listed for Hayward \u003cstrong\u003eH-Series Induced Draft\u003c\/strong\u003e and \u003cstrong\u003eLow NOx\u003c\/strong\u003e heater applications (model\/revision dependent)\u003c\/li\u003e\n    \u003cli\u003eWorks as the \u003cstrong\u003e135°F hi-limit\u003c\/strong\u003e device (verify the temperature rating printed on your existing switch)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    \u003cstrong\u003eFit tip:\u003c\/strong\u003e Heater parts can vary by revision. Confirm your heater model number from the data plate and match the\n    hi-limit temperature rating before ordering.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWhat It Fixes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eHeater shutting down on high-limit safety due to a failed or out-of-spec switch\u003c\/li\u003e\n    \u003cli\u003eIntermittent heating caused by unstable switch contact\u003c\/li\u003e\n    \u003cli\u003ePreventive replacement during heater service when the original switch is corroded or damaged\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Causes of High-Limit Trips (Before Replacing Parts)\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDirty filter or clogged pump basket reducing flow\u003c\/li\u003e\n    \u003cli\u003eClosed\/partially closed valves or bypass settings restricting circulation\u003c\/li\u003e\n    \u003cli\u003eLow water level or suction-side air leak causing poor flow\u003c\/li\u003e\n    \u003cli\u003eScale buildup inside the heat exchanger creating localized overheating\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecs (Quick Reference)\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePart Number: \u003cstrong\u003eHAXHLI1930\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eType: \u003cstrong\u003eHi-Limit Safety Switch\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003eTrip Temperature: \u003cstrong\u003e135°F\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePart Type: \u003cstrong\u003eHeater Parts\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePool Type: \u003cstrong\u003eIn-Ground\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePower off\u003c\/strong\u003e the heater at the breaker before service.\u003c\/li\u003e\n    \u003cli\u003eLabel or photograph wire locations before disconnecting.\u003c\/li\u003e\n    \u003cli\u003eIf the heater continues to trip a new hi-limit, diagnose the \u003cstrong\u003eroot cause\u003c\/strong\u003e (flow restriction, scaling, bypass, pump performance) to prevent repeat shutdowns.\u003c\/li\u003e\n    \u003cli\u003eInstallation should be performed by a qualified technician.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXHLI1930\"\u003eHayward HAXHLI1930 Hi-Limit Switch (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXPSA1930\"\u003eHayward HAXPSA1930 Water Pressure Switch Assembly (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXHOR1930\"\u003eHayward HAXHOR1930 Header O-Ring (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=HAXNNO1930\"\u003eHayward HAXNNO1930 Heater Union\/Nipple Kit (search)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/search?q=hayward%20h-series%20heater%20parts\"\u003eHayward H-Series Heater Parts (search)\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eIf you see repeated hi-limit shutdowns, check \u003cstrong\u003efilter pressure\u003c\/strong\u003e and clean\/ backwash as needed—low flow is the most common cause.\u003c\/li\u003e\n    \u003cli\u003eMaintain balanced water chemistry to reduce \u003cstrong\u003escale\u003c\/strong\u003e that can overheat the heat exchanger.\u003c\/li\u003e\n    \u003cli\u003eVerify proper bypass\/valve settings after any plumbing changes to keep heater flow within its required range.\u003c\/li\u003e\n    \u003cli\u003eKeep the heater cabinet clean and ensure ventilation is not blocked.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":52589938966844,"sku":"HAXHLI1930","price":40.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/hayward-h-series-heater-135f-hi-limit-haxhli1930-heater-parts-3207735.jpg?v=1772790144","url":"https:\/\/aquapoolsupply.com\/products\/haywardhseriesheater135fhilimithaxhli1930hpphaxhli1930","provider":"Aqua Pool Supply","version":"1.0","type":"link"}