{"product_id":"oem-lennox-pressure-switch-58h31","title":"OEM Lennox Pressure Switch — 58H31","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e58H31\u003c\/strong\u003e pressure switch is a furnace safety device that confirms adequate combustion airflow and proper venting before ignition is permitted. As the inducer motor draws air through the heat exchanger, this switch senses the resulting negative pressure and closes its contacts to signal the control board that the system is safe to fire. Built to Lennox specifications, the \u003cstrong\u003e58H31\u003c\/strong\u003e delivers the exact pressure set point your furnace was designed around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing pressure switch often produces a furnace that will not ignite, ignites and immediately drops out, short cycles, or triggers a pressure switch error code on the control board. Cracked hoses, a clogged vent, water in the switch port, or a fatigued diaphragm can all prevent the switch from closing correctly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Because the \u003cstrong\u003e58H31\u003c\/strong\u003e is calibrated to a specific inches-of-water-column threshold unique to your Lennox model, using the genuine part guarantees the safety circuit trips at the intended pressure. Generic replacements with mismatched set points risk nuisance lockouts or unsafe operation. The OEM switch installs with a factory-perfect fit, protects your heat exchanger and combustion process, and keeps your Lennox warranty intact.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081100935539,"sku":"LNX-58H31","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-58H31.jpg?v=1783763061","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-58h31","provider":"National HVAC Parts","version":"1.0","type":"link"}