{"product_id":"oem-lennox-limit-switch-29k51","title":"OEM Lennox Limit Switch — 29K51","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e29K51\u003c\/strong\u003e limit switch is a critical safety control in your Lennox furnace. It monitors the temperature inside the heat exchanger compartment and shuts off the burners if the unit overheats, protecting the heat exchanger and preventing dangerous operating conditions. This factory-calibrated switch is engineered to the exact trip point your Lennox system requires.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e If the \u003cstrong\u003e29K51\u003c\/strong\u003e fails or drifts out of calibration, you may experience short cycling (the furnace turning on and off repeatedly), no heat, the blower running continuously, or the burners failing to ignite at all. A tripped or defective limit switch is one of the most frequent causes of intermittent no-heat calls.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Aftermarket limit switches often use generic temperature ratings that don't match Lennox's precise specifications, which can lead to nuisance trips or, worse, a switch that fails to protect your equipment. The OEM Lennox \u003cstrong\u003e29K51\u003c\/strong\u003e guarantees the correct trip temperature, mounting fit, and reliability your furnace was designed around.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081109651827,"sku":"LNX-29K51","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-29K51.jpg?v=1783762502","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-29k51","provider":"National HVAC Parts","version":"1.0","type":"link"}