{"product_id":"oem-goodman-120-f-auxiliary-limit-switch-for-gdt070-3a-b1370155","title":"OEM Goodman 120°F Auxiliary Limit Switch for GDT070-3A — B1370155","description":"\u003ch2\u003eGoodman B1370155 Auxiliary Limit Switch (120°F)\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eGoodman B1370155\u003c\/strong\u003e is a factory-specified auxiliary limit switch engineered for the \u003cstrong\u003eGDT070-3A\u003c\/strong\u003e gas furnace. This thermal safety device continuously monitors secondary heat-exchanger and blower-compartment temperatures, opening the control circuit to shut down the burners if temperatures climb past its 120°F trip point. It is a critical overheat-protection component — a failed or out-of-spec limit switch can cause short-cycling, no-heat calls, or an unsafe operating condition.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1370155\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Auxiliary (secondary) limit switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Temperature:\u003c\/strong\u003e 120°F (automatic reset)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Model:\u003c\/strong\u003e Goodman GDT070-3A furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Overtemperature safety cutout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment:\u003c\/strong\u003e Gas furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is a genuine \u003cstrong\u003eOEM Goodman\u003c\/strong\u003e switch calibrated to the exact 120°F set point your furnace's control logic expects. Generic aftermarket limits are often available at a lower price but may use loose temperature tolerances that trip early (nuisance shutdowns) or late (reduced protection). For a safety-critical component, we recommend the OEM part to guarantee proper furnace sequencing.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eRating: Easy (1\/5).\u003c\/strong\u003e Replacement is a two-wire swap — disconnect power at the breaker, unplug the spade terminals, remove the mounting screws, install the new switch in the same orientation, and reconnect. Most DIYers complete this in 10–15 minutes. Always cut power before servicing and verify safe operation after replacement. If you are unsure why the original limit tripped, have a licensed HVAC technician inspect the heat exchanger and airflow.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058079809907,"sku":"GOODMAN-10435","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-120-f-auxiliary-limit-switch-for-gdt070-3a-b1370155","provider":"National HVAC Parts","version":"1.0","type":"link"}