{"product_id":"factory-authorized-parts™-hh18ha490-rollout-limit-switch-290-f-manual-reset-spst","title":"Factory Authorized Parts™ HH18HA490 Rollout Limit Switch 290°F Manual Reset SPST","description":"\u003ch1\u003eFactory Authorized Parts™ HH18HA490 Rollout Limit Switch 290°F Manual Reset SPST\u003c\/h1\u003e\n\u003ch2\u003eThe Ultimate Flame-Safe Guardian\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHH18HA490\u003c\/strong\u003e is a critical high-temperature safety component engineered as the primary defense against \"flame rollout\" in high-efficiency gas furnaces. Serving as a localized sensor near the burner assembly, this switch acts as a secondary \"brain\" for combustion safety. It is specifically designed for \u003cstrong\u003eCarrier, Bryant, and Payne gas furnace families\u003c\/strong\u003e, monitoring the burner compartment for diverted flames caused by heat exchanger failure or flue blockages. When it detects a hazardous temperature rise to \u003cstrong\u003e290°F\u003c\/strong\u003e, it instantly breaks the control circuit, shutting down gas flow to prevent catastrophic equipment damage or fire.\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 Exact replacement for \u003cstrong\u003eHH18HA490\u003c\/strong\u003e, ensuring your furnace maintains its original UL safety certification and engineering specifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Reset Security:\u003c\/strong\u003e Features a \"trip-only\" manual reset button that prevents the furnace from automatically restarting until a technician has identified and cleared the underlying rollout cause.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise 290°F Calibration:\u003c\/strong\u003e Optimized to trigger at a high thermal threshold, distinguishing between normal radiant heat and dangerous flame diversion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNormally Closed SPST Logic:\u003c\/strong\u003e Utilizes a Single-Pole, Single-Throw (SPST) configuration that remains closed during safe operation and opens immediately upon thermal emergency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Resistant Disc Design:\u003c\/strong\u003e Built with a durable Klixon-style disc for reliable performance in the harsh, high-heat environment of a burner box.\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 Klixon \/ United Technologies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH18HA490\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 \/ 120V (Pilot Duty)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmps:\u003c\/strong\u003e 0.5A @ 24V \/ 375 VA @ 120 VAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Temperature:\u003c\/strong\u003e 290°F (143°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Manual Push-Button\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ HVAC Depot Pro Tip\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\"Never Just Push the Button!\"\u003c\/strong\u003e While a tripped HH18HA490 can be reset by pressing the red center button, a trip is a symptom of a serious safety issue—not a nuisance. \u003cstrong\u003eTake a picture\u003c\/strong\u003e of the switch's location and the surrounding burner soot before resetting. If the switch has tripped, perform a \"Visual Burner Check\": look for wavy or \"lazy\" yellow flames that roll out of the burner opening. This usually indicates a cracked heat exchanger or a soot-clogged flue that must be professionally inspected before the system is safe to operate.\u003c\/p\u003e\n\u003ch2\u003eCross-Reference\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegacy \/ Superseded Numbers:\u003c\/strong\u003e HH18HA291, HH18HA292, HH118HA490A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawing Numbers:\u003c\/strong\u003e 95-314680, 95-314860, 1NT08L-2696\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Brands:\u003c\/strong\u003e ICP (ArcoAire, Comfortmaker, Heil, Tempstar), White-Rodgers \/ Emerson\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eModel Compatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e58DXT Series\u003c\/strong\u003e (Suffixes: 060-12112, 060-11112, 060-10112)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e310A\/J Series\u003c\/strong\u003e (Suffixes: 024040, 036040, 036060, 048080, 060100)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e58SB\/SC Series\u003c\/strong\u003e (Suffixes: 040-08, 040-12, 060-12, 080-16, 100-20)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePG8M Series\u003c\/strong\u003e (Suffixes: 045040, 045070, 070110)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 class=\"heading-h3-2h4\"\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/h3\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":52235418960235,"sku":"662441983399","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/HH18HA490-1.jpg?v=1772041244","url":"https:\/\/tophvacparts.com\/products\/factory-authorized-parts%e2%84%a2-hh18ha490-rollout-limit-switch-290-f-manual-reset-spst","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}