{"product_id":"factory-authorized-parts™-hh18ha586-furnace-high-limit-safety-switch-180-f-auto-reset","title":"Factory Authorized Parts HH18HA586 Furnace High Limit Safety Switch 180°F Auto Reset","description":"\u003ch1\u003eFactory Authorized Parts™ HH18HA586 Furnace High Limit Safety Switch 180°F Auto Reset \u003c\/h1\u003e\n\u003ch2\u003eThe Intelligent Thermal Guard\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHH18HA586\u003c\/strong\u003e is a high-performance primary limit switch (LS1) engineered to serve as the thermal \"brain\" for the safety circuit in high-efficiency gas furnaces. Designed specifically for the \u003cstrong\u003eCarrier, Bryant, and Payne furnace families\u003c\/strong\u003e, this component monitors the temperature of the air passing through the heat exchanger. Its critical function is to prevent internal overheating by interrupting the 24V control circuit if temperatures exceed the safe threshold. As a genuine Factory Authorized Part, it ensures that your system maintains its original engineering specifications, protecting the heat exchanger from thermal stress and ensuring long-term system reliability.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Part Number:\u003c\/strong\u003e Directly replaces part number \u003cstrong\u003eHH18HA586\u003c\/strong\u003e, ensuring 100% electrical compatibility and maintaining the manufacturer’s UL safety rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision 180°F Calibration:\u003c\/strong\u003e Calibrated to \"open\" at exactly 180°F, providing a rapid safety response to restricted airflow or mechanical failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset Logic:\u003c\/strong\u003e Features an auto-reset bi-metal disc that restores the circuit once the furnace cools to safe operating levels, preventing permanent system lockouts during minor airflow fluctuations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Reliability:\u003c\/strong\u003e Engineered to solve \"nuisance tripping\" and clicking noises caused by aged or weakened thermal discs in older furnace units.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Integration:\u003c\/strong\u003e Designed with standard 1\/4\" male spade terminals for a secure, vibration-resistant connection to the factory wiring harness.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Factory Authorized Parts™ (Carrier\/Bryant\/Payne)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e United Technologies \/ Carrier Corp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH18HA586\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.10 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24V (Control Circuit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmps\/Watts:\u003c\/strong\u003e 0.5A @ 24VAC (Pilot Duty)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type:\u003c\/strong\u003e Compatible with HSI and Spark Ignition systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 180°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Automatic Reset\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ HVAC Depot Pro Tip\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\"Take a Picture First!\"\u003c\/strong\u003e Before removing the old switch, photograph the wire colors and the mounting orientation. The HH18HA586 is often mounted in tight spaces where wire reach is limited. After installation, perform a \"Static Pressure Check\": if this switch continues to trip, it is likely doing its job and signaling that your air filter is too restrictive or your evaporator coil is clogged. Never bypass this switch to achieve heat; it is there to prevent a cracked heat exchanger!\u003c\/p\u003e\n\u003cp\u003eCross-Reference\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperseded Numbers:\u003c\/strong\u003e HH18HA231, HH18HA386\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegacy Numbers:\u003c\/strong\u003e 1013454, 313362-431\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawing Numbers:\u003c\/strong\u003e 1NT01L-4375, 95-313362\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Brands:\u003c\/strong\u003e ICP (Heil, Tempstar, Comfortmaker), White-Rodgers \/ Emerson\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eModel Compatibility\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e58STA\/STX Series\u003c\/strong\u003e (Suffixes: 045-12, 070-12, 090-14, 110-20, 135-22)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e310A\/J Series\u003c\/strong\u003e (Suffixes: 024045, 036070, 048090, 066110, 066135)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e912S\/915S Series\u003c\/strong\u003e (Suffixes: 30040S, 36060S, 42080S, 60100S, 60120S)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePG8M Series\u003c\/strong\u003e (Suffixes: 045045, 070070, 090090, 110110, 135135)\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":52235432755563,"sku":"HH18HA586","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/HH18HA138.jpg?v=1772041244","url":"https:\/\/tophvacparts.com\/products\/factory-authorized-parts%e2%84%a2-hh18ha586-furnace-high-limit-safety-switch-180-f-auto-reset","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}