{"product_id":"oem-lennox-pressure-switch-33j88","title":"OEM Lennox Pressure Switch — 33J88","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33J88\u003c\/strong\u003e pressure switch is a combustion safety control that verifies adequate venting and draft before your Lennox furnace fires. By monitoring the negative pressure generated by the draft-inducer motor, the \u003cstrong\u003e33J88\u003c\/strong\u003e ensures the burner only ignites when the flue path is clear and airflow is correct, guarding against the spillage of combustion gases into the home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e33J88\u003c\/strong\u003e fails or detects a venting issue, you may see a furnace that won't start, short-cycles on ignition, runs the inducer without progressing to heat, or reports a pressure-switch\/lockout code on the control board. Root causes include a switch stuck open or closed, a pinched or condensate-filled sensing hose, or a restricted vent or drain.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Each pressure switch is calibrated to a precise trip pressure suited to the furnace's venting and altitude design. The factory Lennox \u003cstrong\u003e33J88\u003c\/strong\u003e matches that exact set point and connector, delivering dependable safety shutoff and correct ignition sequencing. Substituting a switch with a different calibration can cause nuisance lockouts or, worse, allow unsafe operation — which is why the OEM part is the right choice for your Lennox system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108832627,"sku":"LNX-33J88","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-draft-inducer-LNX-33J88.jpg?v=1783763026","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-33j88","provider":"National HVAC Parts","version":"1.0","type":"link"}