{"product_id":"oem-lennox-pressure-switch-56m93","title":"OEM Lennox Pressure Switch — 56M93","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e56M93\u003c\/strong\u003e pressure switch is an air-proving safety device that confirms your furnace's draft inducer is moving combustion gases correctly before the burners ignite. It senses the negative pressure created by the inducer motor and closes its contacts to allow ignition, ensuring the flue is clear and exhaust is venting safely away from your home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A stuck or failed \u003cstrong\u003e56M93\u003c\/strong\u003e pressure switch is a frequent cause of no-heat calls. Symptoms include the furnace failing to ignite, the inducer running but burners never lighting, repeated system lockouts, or a diagnostic code indicating an open or stuck-closed pressure switch. A cracked hose, blockage, or worn diaphragm can all trigger a fault.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Pressure switches are calibrated to a specific trip point measured in inches of water column. Using a switch with the wrong setpoint can allow the furnace to fire under unsafe venting conditions or block ignition entirely. The factory-spec \u003cstrong\u003e56M93\u003c\/strong\u003e is matched to your Lennox model's exact pressure requirements for safe, dependable operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081102377331,"sku":"LNX-56M93","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-56M93.jpg?v=1783763055","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-56m93","provider":"National HVAC Parts","version":"1.0","type":"link"}