{"product_id":"oem-lennox-pressure-switch-80k25","title":"OEM Lennox Pressure Switch — 80K25","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80K25\u003c\/strong\u003e pressure switch is a critical safety control in your Lennox gas furnace. It monitors the negative pressure created by the draft inducer motor to confirm that combustion gases are venting properly before the ignition sequence begins. If adequate airflow isn't detected, the switch prevents the furnace from firing — protecting your home from unsafe operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms include:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFurnace ignites briefly then shuts down (short cycling)\u003c\/li\u003e\n\u003cli\u003eControl board flashes a pressure switch fault code\u003c\/li\u003e\n\u003cli\u003eBlower or inducer runs but the burners never light\u003c\/li\u003e\n\u003cli\u003eStuck-open or stuck-closed switch readings during diagnostics\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eA worn diaphragm, cracked hose port, or contamination inside the switch can all cause nuisance lockouts and no-heat calls. Installing the exact Lennox \u003cstrong\u003e80K25\u003c\/strong\u003e restores reliable pressure sensing at the factory-calibrated set point.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox furnaces are engineered around precise pressure thresholds tuned to each heat exchanger and inducer combination. Aftermarket switches often trip at the wrong pressure, leading to intermittent faults or bypassed safety protection. The OEM \u003cstrong\u003e80K25\u003c\/strong\u003e guarantees the correct calibration, fit, and electrical connection for dependable, code-compliant performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081094840691,"sku":"LNX-80K25","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-LNX-80K25.jpg?v=1783763080","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-80k25","provider":"National HVAC Parts","version":"1.0","type":"link"}