{"product_id":"oem-lennox-flame-rollout-switch-15m42","title":"OEM Lennox Flame Rollout Switch — 15M42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e15M42\u003c\/strong\u003e flame rollout switch is a manual-reset safety limit control positioned near the burner box of your Lennox gas furnace. It monitors for flames or heat rolling out of the combustion area — an unsafe condition typically caused by a blocked heat exchanger, restricted flue, or inadequate combustion airflow. When it senses excessive temperature, the \u003cstrong\u003e15M42\u003c\/strong\u003e opens the safety circuit and cuts power to the gas valve to protect against fire.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace ignites and then shuts off on lockout, no heat despite the blower running, or a persistent limit-circuit error at the control board. The switch can also degrade over time from thermal fatigue or corroded contacts, causing false trips even when combustion is normal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e This switch is factory-calibrated to a precise trip point specific to your furnace model. Using the exact Lennox \u003cstrong\u003e15M42\u003c\/strong\u003e preserves the safety design of the appliance — an off-spec aftermarket part with a different setpoint can shut the unit down prematurely or leave it unprotected. Choose the OEM part for guaranteed fit, correct calibration, and reliable safety operation in your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081114468723,"sku":"LNX-15M42","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-rollout-LNX-15M42.jpg?v=1783760960","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-flame-rollout-switch-15m42","provider":"National HVAC Parts","version":"1.0","type":"link"}