{"product_id":"oem-lennox-limit-switch-12l38","title":"OEM Lennox Limit Switch — 12L38","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12L38\u003c\/strong\u003e limit switch protects your Lennox furnace from overheating by monitoring the temperature in the heat exchanger or plenum. When air temperature climbs above the safe threshold — typically from restricted airflow or a blower issue — the switch opens and shuts off the burners, preventing heat exchanger damage and unsafe operating conditions.\u003c\/p\u003e\u003cp\u003eA failing or tripped limit switch commonly causes short-cycling, where the furnace heats briefly then shuts down, no heat output, or the blower running continuously to shed excess heat. A dirty filter, blocked ducts, or a weak blower motor can cause the switch to trip repeatedly, so those conditions should be checked alongside the switch itself.\u003c\/p\u003e\u003cp\u003eThe OEM Lennox \u003cstrong\u003e12L38\u003c\/strong\u003e is manufactured to the precise trip and reset temperatures your furnace's control sequence depends on. A generic limit with a different set point can allow overheating or cause nuisance shutdowns. Choose the factory-matched part for reliable, safe temperature protection.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081134293363,"sku":"LNX-12L38","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-snap-disc-LNX-12L38.jpg?v=1783762462","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-12l38","provider":"National HVAC Parts","version":"1.0","type":"link"}