{"product_id":"oem-lennox-high-altitude-pressure-switch-15m22","title":"OEM Lennox High Altitude Pressure Switch — 15M22","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e15M22\u003c\/strong\u003e is a high-altitude pressure switch that verifies proper draft and combustion airflow in your Lennox gas furnace before the ignition sequence begins. It is specifically calibrated for high-elevation installations, where thinner air changes the pressure the switch must sense. The \u003cstrong\u003e15M22\u003c\/strong\u003e confirms the inducer motor is moving flue gases correctly and safely closes the circuit to allow ignition only when adequate draft is present.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace inducer runs but the burners never light, the unit short-cycles or locks out, or a pressure-switch fault appears at the control board. Failures often stem from a stuck diaphragm, cracked sensing tubing, or a switch that no longer closes at its rated pressure — leaving the furnace unable to prove draft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Pressure switches are matched to an exact activation setpoint and elevation range. The high-altitude Lennox \u003cstrong\u003e15M22\u003c\/strong\u003e is factory-calibrated for the correct pressure threshold, so substituting a standard or off-spec switch can cause nuisance lockouts or unsafe operation. Install the genuine OEM part for guaranteed calibration, proper fit, and dependable safety performance in your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081114501491,"sku":"LNX-15M22","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-15M22.jpg?v=1783761960","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-high-altitude-pressure-switch-15m22","provider":"National HVAC Parts","version":"1.0","type":"link"}