{"product_id":"high-limit-switch-52-55","title":"Astralpool Hi Limit 52C - NC Auto","description":"\u003ch3\u003eAstralpool Hi Limit 52C - NC Auto\u003c\/h3\u003e\u003cp\u003e\u003cspan\u003eHi Limit 52°C – NC Auto Thread. 52-55C high limit switch suits all \u003cstrong\u003eMX, HX, JX, HiNRG, Viron, ICI gas heaters. \u003c\/strong\u003e\u003c\/span\u003eHigh Limit Switch used in Hurlcon \u0026amp; Astralpool gas heaters and INSNRG gas heaters. Common source of F2 error. Used on many pool and spa heaters. Part Number 71031 and 21C01513001. Last photo shows the high limit screwed in the brass plug.\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\u003cstrong\u003eThe most common reason for failure is a leaking \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches\"\u003ebrass plug\u003c\/a\u003e causing the limit switch to corrode.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote: \u003c\/strong\u003eWe are that some online sellers are illegally selling low-quality unapproved cheap switches that are non-compliant. All hi-limit switches must have DVE certification (ours do). \u003c\/p\u003e\n\u003cp\u003eThese suit all Hurlcon Astralpool HX, MX, Viron, HiNRG, JX Gas Heaters. Also suits Jacuzzi J-HN250C \u0026amp; J-HN400C heaters and INSNRG.\u003c\/p\u003e\n\u003cp\u003eFound on the Outlet side of a gas pool or spa heater. Also called a Thermal Cutout or Thermal Safety Cutout Switch.\u003c\/p\u003e\n\u003cp\u003eFailed hi limits can cause the F2 Errors found on Hurlcon and Astral Gas Heaters. Commonly fail due to condensation and leaks. Should be replaced every few years as part of preventative maintenance.\u003c\/p\u003e\n\u003cp\u003eBoth Inlet \u0026amp; Outlet hi limits should be replaced at the same time.\u003c\/p\u003e\n\u003cp\u003eThere are two types, threaded (Viron, HiNRG, later HX, JX, MX) which is screwed into the brass plug, and non-threaded style that is held in either by a bracket (older MX), or screws (older JX, HX).\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cb\u003eImportant Notes \u0026amp; Installation:\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAstralpool \/ Hurlcon gas heaters have a \u003cstrong\u003eseparate \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches\" title=\"Hurlcon Astralpool Brass Plug\"\u003ebrass plug\u003c\/a\u003e that this hi-limit screws into\u003c\/strong\u003e. Check the brass plug for leaks, corrosion, or damaged threads, and replace it if necessary. The last images show the hi-limit screwed into the \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches\" rel=\"noopener noreferrer\" target=\"_blank\"\u003ebrass plug\u003c\/a\u003e for reference.\n\u003cul\u003e\n\u003cli\u003eOn older heaters, corrosion often makes these two separate parts \u003cem\u003elook \u003c\/em\u003elike one single piece with a larger thread. \u003cstrong\u003eThey are \u003cem\u003enot\u003c\/em\u003e one piece even if it looks like it us!\u003c\/strong\u003e It is a hi-limit switch screwed into a separate brass plug -- See images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eThese are an Extremely Important Safety feature found on heaters, and are required by law. They must be replaced when necessary. \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMost new high limits and \u003cem\u003eall \u003c\/em\u003eNon-threaded and Aftermarket switches use more common 6.3mm spade terminals (available as an Add-on in this listing or at any electrical supplier).\u003c\/li\u003e\n\u003cli\u003eSome brass plugs are not tapped as deeply as others. \u003cstrong\u003eIf the new hi-limit does not gently screw all the way in\u003c\/strong\u003e, carefully \u003cstrong\u003efile a small amount off the M4\u003c\/strong\u003e thread on the new switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003eDo not overtighten.\u003c\/strong\u003e\u003c\/span\u003e The thin brass M4 thread is extremely easy to break. If you feel any resistance when screwing it in, stop, clean the threads, and apply a small amount of light lubricant. \u003cstrong\u003eBroken threads are not covered by warranty\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThis hi-limit is for the \u003cstrong\u003eoutlet side\u003c\/strong\u003e of the water connection. Inlet hi-limits are listed below.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHurlcon Astralpool Jacuzzi:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHX 70, HX 120, HX 150, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500, JX 130, JX 160, HiNRG 175, HiNRG 250, HiNRG 400, Viron 250, Viron 350, Viron 450, Viron 550, WX 70, WX 120, WX 150, \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-ici-gas-heater-pool-spa-heater\" title=\"Astralpool ICI Gas Heater\"\u003eICI 200\u003c\/a\u003e, \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-ici-gas-heater-pool-spa-heater\" title=\"Astralpool ICI Gas Heater\"\u003eICI 400\u003c\/a\u003e, Jacuzzi and many more.\u003c\/li\u003e\n\u003cli\u003eCampini Ty60 10\/250 T210 41-04 55°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong style=\"font-size: 0.875rem;\"\u003eHigh Limit (Hi Limit) Switches:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-42-45\" title=\"Inlet Hi Limit Switch Sensor for Hurlcon Raypak Gas Heaters\"\u003e42-45C° Inlet Hi Limit (Hurlcon, Astralpool)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-52-55\" title=\"Outlet Hi Limit Sensor Switch Hurlcon Astralpool Raypak\"\u003e52-55C° Outlet Hi Limit (Hurlcon, Astralpool\u003c\/a\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-42-45\" title=\"Inlet Hi Limit Switch Sensor for Hurlcon Raypak Gas Heaters\"\u003e)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-70\" title=\"70C Outlet Hi Limit HX JX Astralpool Hurlcon Gas Heaters\"\u003e70C° Outlet Hi Limit (Hurlcon, Astralpool)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/high-limit-switch-175-hurlcon-viron-flue\" title=\"Viron Flue Temp Sensor Hi Limit\"\u003e175C° Flue Temp Sensor (Hurlcon, Astralpool)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/astralpool-hurlcon-brass-plug-for-hi-limit-switches\"\u003eHurlcon \/ Astralpool HiLimit Locator Brass Threaded Plug\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues:\n \u003ca href=\"https:\/\/hasp.com.au\/pages\/Astralpool_Catalogue_2026\"\u003eAstralpool Catalogue 2026\u003c\/a\u003e | \u003ca href=\"https:\/\/hasp.com.au\/pages\/Zodiac_Catalogue_2026\"\u003eZodiac Catalogue 2026\u003c\/a\u003e\n\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eInteractive Parts Diagrams\u003c\/h3\u003e\u003c!-- hasp-parts-diagrams --\u003e\u003cp style=\"font-size:16px;\"\u003eFind this part on our interactive heater parts diagrams — each one opens the full exploded view and parts list:\u003c\/p\u003e\u003cul\u003e\u003cli style=\"font-size:16px;\"\u003e\u003ca href=\"https:\/\/heaterandspaparts.com.au\/pages\/astralpool-hurlcon-hx-120-gas-heater-spare-parts-diagram-list\" style=\"color:#009BDB;font-weight:600;\"\u003eAstralpool \/ Hurlcon HX 120 Gas Heater — Diagram \u0026amp; Parts\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e","brand":"Astralpool","offers":[{"title":"52-55° Threaded - Aftermarket","offer_id":34730069819548,"sku":"55° Threaded + 2x Red Spade Female Terminals","price":43.0,"currency_code":"NZD","in_stock":true},{"title":"52-55° Threaded w\/ Brass Plug - Aftermarket","offer_id":43314265227453,"sku":"71060 + 52° Threaded Aftermarket +  + 2x Red Spade Female Terminals","price":115.0,"currency_code":"NZD","in_stock":true},{"title":"52-55° Threaded - OEM","offer_id":34730069786780,"sku":"71031","price":92.0,"currency_code":"NZD","in_stock":true},{"title":"52-55° Threaded - OEM w\/ Brass Plug","offer_id":46542602535101,"sku":"71031 + 71060","price":180.0,"currency_code":"NZD","in_stock":true},{"title":"55° Non-Threaded","offer_id":46529554317501,"sku":null,"price":43.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/astralpool-hi-limit-52c-nc-auto-52-55-threaded-oem-gas-heater-parts-551.webp?v=1779172807","url":"https:\/\/heaterandspaparts.com.au\/en-nz\/products\/high-limit-switch-52-55","provider":"Heater and Spa Parts","version":"1.0","type":"link"}