{"product_id":"oem-lennox-pressure-switch-71j33","title":"OEM Lennox Pressure Switch — 71J33","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e71J33\u003c\/strong\u003e pressure switch is a critical safety control that confirms the draft inducer is producing adequate airflow before the furnace allows ignition. It senses the vacuum created by the inducer motor and closes its contacts to signal the control board that venting is safe, protecting your home from unburned gas and flue-gas spillage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace ignites then shuts off, repeated lockouts, an inducer that runs continuously without firing, error codes indicating a pressure-switch fault, or no heat at all. Failures often trace to a stuck diaphragm, a cracked hose port, or contacts that no longer make.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e pressure switches are calibrated to a precise trip point in inches of water column. Installing a switch with the wrong setpoint can allow the furnace to fire under unsafe venting conditions or cause constant nuisance trips. The OEM \u003cstrong\u003e71J33\u003c\/strong\u003e is matched to your Lennox model's exact specification, ensuring safe, code-compliant, dependable operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097199987,"sku":"LNX-71J33","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-71J33.jpg?v=1783763071","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-71j33","provider":"National HVAC Parts","version":"1.0","type":"link"}